Sometimes it hangs at

[dochtml] [geometry ] build succeeded.
[dochtml] Build finished.  The built documents can be found in 
/home/dima/Sage/sage-dev/local/share/doc/sage/inventory/en/reference/geometry

and sometimes at the end of the previous manual part ([plotting]), 
sometimes at [reference].

It does not matter whether this happens after an incremental build, or a 
build after doc-clean, or one after distclean.
If I hit Control-C I get

[dochtml] [reference] build succeeded.
[dochtml] Build finished.  The built documents can be found in 
/home/dima/Sage/sage-dev/local/share/doc/sage/inventory/en/reference/references
^C[dochtml] Process PoolWorker-71:
[dochtml] Traceback (most recent call last):
[dochtml]   File 
"/home/dima/Sage/sage-dev/local/lib/python/multiprocessing/process.py", 
line 258, in _bootstrap
[dochtml]     self.run()
[dochtml]   File 
"/home/dima/Sage/sage-dev/local/lib/python/multiprocessing/process.py", 
line 114, in run
[dochtml]     self._target(*self._args, **self._kwargs)
[dochtml]   File 
"/home/dima/Sage/sage-dev/local/lib/python/multiprocessing/pool.py", line 
102, in worker
[dochtml]     task = get()
[dochtml]   File 
"/home/dima/Sage/sage-dev/local/lib/python/multiprocessing/queues.py", line 
378, in get
[dochtml]     return recv()
[dochtml]   File "src/cysignals/signals.pyx", line 252, in 
cysignals.signals.python_check_interrupt 
(build/src/cysignals/signals.c:2845)
[dochtml]   File "src/cysignals/signals.pyx", line 97, in 
cysignals.signals.sig_raise_exception (build/src/cysignals/signals.c:1294)
[dochtml] KeyboardInterrupt
[dochtml] Error building the documentation.
[dochtml] Traceback (most recent call last):
[dochtml]   File "/home/dima/Sage/sage-dev/local/lib/python/runpy.py", line 
162, in _run_module_as_main
[dochtml]     "__main__", fname, loader, pkg_name)
[dochtml]   File "/home/dima/Sage/sage-dev/local/lib/python/runpy.py", line 
72, in _run_code
[dochtml]     exec code in run_globals
[dochtml]   File 
"/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/sage_setup/docbuild/__main__.py",
 
line 2, in <module>
[dochtml]     main()
[dochtml]   File 
"/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 
line 1658, in main
[dochtml]     builder()
[dochtml]   File 
"/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 
line 284, in _wrapper
[dochtml]     getattr(get_builder(document), 'inventory')(*args, **kwds)
[dochtml]   File 
"/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 
line 495, in _wrapper
[dochtml]     x.get(99999)
[dochtml]   File 
"/home/dima/Sage/sage-dev/local/lib/python/multiprocessing/pool.py", line 
561, in get
[dochtml]     self.wait(timeout)
[dochtml]   File 
"/home/dima/Sage/sage-dev/local/lib/python/multiprocessing/pool.py", line 
556, in wait
[dochtml]     self._cond.wait(timeout)
[dochtml]   File "/home/dima/Sage/sage-dev/local/lib/python/threading.py", 
line 359, in wait
[dochtml]     _sleep(delay)
[dochtml]   File "src/cysignals/signals.pyx", line 252, in 
cysignals.signals.python_check_interrupt 
(build/src/cysignals/signals.c:2845)
[dochtml]   File "src/cysignals/signals.pyx", line 97, in 
cysignals.signals.sig_raise_exception (build/src/cysignals/signals.c:1294)
[dochtml] KeyboardInterrupt
[dochtml] 
[dochtml] Note: incremental documentation builds sometimes cause spurious
[dochtml] error messages. To be certain that these are real errors, run
[dochtml] "make doc-clean" first and try again.
make[2]: *** [Makefile:1065: doc-html] Error 1
make[1]: *** [Makefile:888: all] Interrupt
make: *** [Makefile:18: all] Error 130

Attached it also the output of strace of the docbuild process, it waits 
until I hit Control-C, otherwise it's just endless
strace: Process 29981 attached with 4 threads
[pid 30020] futex(0x7f6f1c000fa0, 
FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, 0xffffffff 
<unfinished ...>
[pid 30021] read(5,  <unfinished ...>
[pid 30019] select(0, NULL, NULL, NULL, {0, 42749} <unfinished ...>
[pid 29981] select(0, NULL, NULL, NULL, {0, 5829}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)

Any idea what goes wrong? (this is with cysignals 1.3.2, but the picture 
with cysignals 1.1.1 is the same).
 

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strace: Process 29981 attached with 4 threads
[pid 30020] futex(0x7f6f1c000fa0, 
FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, 0xffffffff <unfinished 
...>
[pid 30021] read(5,  <unfinished ...>
[pid 30019] select(0, NULL, NULL, NULL, {0, 42749} <unfinished ...>
[pid 29981] select(0, NULL, NULL, NULL, {0, 5829}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] wait4(30170, 0x7f7199da9c14, WNOHANG, NULL) = 0
[pid 30019] select(0, NULL, NULL, NULL, {0, 100000} <unfinished ...>
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 50000}) = ? ERESTARTNOHAND (To be 
restarted if no handler)
[pid 29981] --- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
[pid 29981] rt_sigreturn({mask=[]})     = -1 EINTR (Interrupted system call)
[pid 29981] rt_sigprocmask(SIG_BLOCK, [HUP INT ALRM], [], 8) = 0
[pid 29981] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 29981] stat("/home/dima/Sage/sage-dev/local/lib/python/runpy.py", 
{st_mode=S_IFREG|0644, st_size=10698, ...}) = 0
[pid 29981] open("/home/dima/Sage/sage-dev/local/lib/python/runpy.py", 
O_RDONLY) = 7
[pid 29981] fstat(7, {st_mode=S_IFREG|0644, st_size=10698, ...}) = 0
[pid 29981] fstat(7, {st_mode=S_IFREG|0644, st_size=10698, ...}) = 0
[pid 29981] read(7, "\"\"\"runpy.py - locating and runni"..., 8192) = 8192
[pid 29981] read(7, ".read(), fname, 'exec')\n    retu"..., 4096) = 2506
[pid 29981] read(7, "", 4096)           = 0
[pid 29981] close(7)                    = 0
[pid 29981] stat("/home/dima/Sage/sage-dev/local/lib/python/runpy.py", 
{st_mode=S_IFREG|0644, st_size=10698, ...}) = 0
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/sage_setup/docbuild/__main__.py",
 {st_mode=S_IFREG|0644, st_size=454, ...}) = 0
[pid 29981] 
open("/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/sage_setup/docbuild/__main__.py",
 O_RDONLY) = 7
[pid 29981] fstat(7, {st_mode=S_IFREG|0644, st_size=454, ...}) = 0
[pid 29981] fstat(7, {st_mode=S_IFREG|0644, st_size=454, ...}) = 0
[pid 29981] read(7, "from . import main\nmain()\n\n# Rem"..., 8192) = 454
[pid 29981] read(7, "", 4096)           = 0
[pid 29981] close(7)                    = 0
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 {st_mode=S_IFREG|0644, st_size=63388, ...}) = 0
[pid 29981] 
open("/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 O_RDONLY) = 7
[pid 29981] fstat(7, {st_mode=S_IFREG|0644, st_size=63388, ...}) = 0
[pid 29981] fstat(7, {st_mode=S_IFREG|0644, st_size=63388, ...}) = 0
[pid 29981] read(7, "\"\"\"\nThe documentation builder\n\nI"..., 8192) = 8192
[pid 29981] read(7, "document)\n    getattr(get_builde"..., 4096) = 4096
[pid 29981] read(7, "()\n\n    def create_html_redirect"..., 4096) = 4096
[pid 29981] read(7, "  lang = doc[0]\n            doc."..., 4096) = 4096
[pid 29981] read(7, "put_dir, 'index.html'))\n        "..., 4096) = 4096
[pid 29981] read(7, "listdir(refdir):\n            dir"..., 4096) = 4096
[pid 29981] read(7, "       cache = {}\n        else:\n"..., 4096) = 4096
[pid 29981] read(7, "99.\n            if name.startswi"..., 4096) = 4096
[pid 29981] read(7, "      title = self.get_module_do"..., 4096) = 4096
[pid 29981] read(7, "basename(path))[0]\n        latex"..., 4096) = 4096
[pid 29981] read(7, "ent=4, pad=3, width=80):\n    \"\"\""..., 4096) = 4096
[pid 29981] read(7, "er can run on the indicated docu"..., 4096) = 4096
[pid 29981] read(7, "it\")\n    standard.add_option(\"-H"..., 4096) = 4096
[pid 29981] mmap(NULL, 262144, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x7f6f28aa1000
[pid 29981] read(7, "     help=\"before building refer"..., 4096) = 4096
[pid 29981] read(7, "and-line.\n    parser = setup_par"..., 4096) = 1948
[pid 29981] read(7, "", 4096)           = 0
[pid 29981] close(7)                    = 0
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 {st_mode=S_IFREG|0644, st_size=63388, ...}) = 0
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 {st_mode=S_IFREG|0644, st_size=63388, ...}) = 0
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python/multiprocessing/pool.py", 
{st_mode=S_IFREG|0644, st_size=24000, ...}) = 0
[pid 29981] 
open("/home/dima/Sage/sage-dev/local/lib/python/multiprocessing/pool.py", 
O_RDONLY) = 7
[pid 29981] fstat(7, {st_mode=S_IFREG|0644, st_size=24000, ...}) = 0
[pid 29981] fstat(7, {st_mode=S_IFREG|0644, st_size=24000, ...}) = 0
[pid 29981] read(7, "#\n# Module providing the `Pool` "..., 8192) = 8192
[pid 29981] read(7, "valent of `itertools.imap()` -- "..., 4096) = 4096
[pid 29981] read(7, "         except Exception as ex:"..., 4096) = 4096
[pid 29981] read(7, " pool,\n                        w"..., 4096) = 4096
[pid 29981] read(7, "self._success = False\n          "..., 4096) = 3520
[pid 29981] read(7, "", 4096)           = 0
[pid 29981] close(7)                    = 0
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python/multiprocessing/pool.py", 
{st_mode=S_IFREG|0644, st_size=24000, ...}) = 0
[pid 29981] stat("/home/dima/Sage/sage-dev/local/lib/python/threading.py", 
{st_mode=S_IFREG|0644, st_size=47330, ...}) = 0
[pid 29981] open("/home/dima/Sage/sage-dev/local/lib/python/threading.py", 
O_RDONLY) = 7
[pid 29981] fstat(7, {st_mode=S_IFREG|0644, st_size=47330, ...}) = 0
[pid 29981] fstat(7, {st_mode=S_IFREG|0644, st_size=47330, ...}) = 0
[pid 29981] read(7, "\"\"\"Thread module emulating a sub"..., 8192) = 8192
[pid 29981] read(7, "ore threads to wait until they a"..., 4096) = 4096
[pid 29981] read(7, "                endtime = _time("..., 4096) = 4096
[pid 29981] read(7, " with blocking set to false, do "..., 4096) = 4096
[pid 29981] read(7, "f.__cond.__init__()\n\n    def isS"..., 4096) = 4096
[pid 29981] read(7, "lized = True\n        # sys.stder"..., 4096) = 4096
[pid 29981] read(7, " if __debug__:\n                s"..., 4096) = 4096
[pid 29981] read(7, "s the (if any) thread currently "..., 4096) = 4096
[pid 29981] read(7, "ent(self):\n        \"\"\"Thread ide"..., 4096) = 4096
[pid 29981] read(7, "y thread class to represent thre"..., 4096) = 4096
[pid 29981] read(7, " code\n\ndef _test():\n\n    class B"..., 4096) = 2274
[pid 29981] read(7, "", 4096)           = 0
[pid 29981] close(7)                    = 0
[pid 29981] stat("src/cysignals/signals.pyx", 0x7fff5910fcb0) = -1 ENOENT (No 
such file or directory)
[pid 29981] stat("src/cysignals/signals.pyx", 0x7fff5910fcb0) = -1 ENOENT (No 
such file or directory)
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python/src/cysignals/signals.pyx", 
0x7fff5910fcb0) = -1 ENOENT (No such file or directory)
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python27.zip/src/cysignals/signals.pyx",
 0x7fff5910fcb0) = -1 ENOENT (No such file or directory)
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python2.7/plat-linux2/src/cysignals/signals.pyx",
 0x7fff5910fcb0) = -1 ENOENT (No such file or directory)
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python2.7/lib-tk/src/cysignals/signals.pyx",
 0x7fff5910fcb0) = -1 ENOENT (No such file or directory)
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python2.7/lib-old/src/cysignals/signals.pyx",
 0x7fff5910fcb0) = -1 ENOENT (No such file or directory)
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python2.7/lib-dynload/src/cysignals/signals.pyx",
 0x7fff5910fcb0) = -1 ENOENT (No such file or directory)
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/src/cysignals/signals.pyx",
 0x7fff5910fcb0) = -1 ENOENT (No such file or directory)
[pid 29981] stat("/home/dima/Sage/sage-dev/src/src/cysignals/signals.pyx", 
0x7fff5910fcb0) = -1 ENOENT (No such file or directory)
[pid 29981] stat("src/cysignals/signals.pyx", 0x7fff5910fcb0) = -1 ENOENT (No 
such file or directory)
[pid 29981] stat("src/cysignals/signals.pyx", 0x7fff5910fcb0) = -1 ENOENT (No 
such file or directory)
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python/src/cysignals/signals.pyx", 
0x7fff5910fcb0) = -1 ENOENT (No such file or directory)
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python27.zip/src/cysignals/signals.pyx",
 0x7fff5910fcb0) = -1 ENOENT (No such file or directory)
[pid 29981] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=30170, 
si_uid=1000, si_status=1, si_utime=0, si_stime=1} ---
[pid 30019] <... select resumed> )      = ? ERESTARTNOHAND (To be restarted if 
no handler)
[pid 30019] select(0, NULL, NULL, NULL, {0, 15046} <unfinished ...>
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python2.7/plat-linux2/src/cysignals/signals.pyx",
 0x7fff5910fcb0) = -1 ENOENT (No such file or directory)
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python2.7/lib-tk/src/cysignals/signals.pyx",
 0x7fff5910fcb0) = -1 ENOENT (No such file or directory)
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python2.7/lib-old/src/cysignals/signals.pyx",
 0x7fff5910fcb0) = -1 ENOENT (No such file or directory)
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python2.7/lib-dynload/src/cysignals/signals.pyx",
 0x7fff5910fcb0) = -1 ENOENT (No such file or directory)
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/src/cysignals/signals.pyx",
 0x7fff5910fcb0) = -1 ENOENT (No such file or directory)
[pid 29981] stat("/home/dima/Sage/sage-dev/src/src/cysignals/signals.pyx", 
0x7fff5910fcb0) = -1 ENOENT (No such file or directory)
[pid 29981] write(2, "Error building the documentation"..., 1516) = 1516
[pid 29981] write(2, "\nNote: incremental documentation"..., 165) = 165
[pid 29981] 
stat("/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/sage/misc/shutil",
 0x7fff59110010) = -1 ENOENT (No such file or directory)
[pid 29981] 
open("/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/sage/misc/shutil.so",
 O_RDONLY) = -1 ENOENT (No such file or directory)
[pid 29981] 
open("/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/sage/misc/shutilmodule.so",
 O_RDONLY) = -1 ENOENT (No such file or directory)
[pid 29981] 
open("/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/sage/misc/shutil.py",
 O_RDONLY) = -1 ENOENT (No such file or directory)
[pid 29981] 
open("/home/dima/Sage/sage-dev/local/lib/python2.7/site-packages/sage/misc/shutil.pyc",
 O_RDONLY) = -1 ENOENT (No such file or directory)
[pid 29981] stat("/home/dima/.sage/temp/localhost.localdomain", 
{st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 29981] mkdir("/home/dima/.sage/temp/localhost.localdomain/29981", 0777) = 
-1 EEXIST (File exists)
[pid 29981] stat("/home/dima/.sage/temp/localhost.localdomain/29981", 
{st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 29981] lstat("/home/dima/.sage/temp/localhost.localdomain/29981", 
{st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 29981] open("/home/dima/.sage/temp/localhost.localdomain/29981", 
O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 7
[pid 29981] fstat(7, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 29981] getdents(7, /* 2 entries */, 32768) = 48
[pid 29981] getdents(7, /* 0 entries */, 32768) = 0
[pid 29981] close(7)                    = 0
[pid 29981] rmdir("/home/dima/.sage/temp/localhost.localdomain/29981") = 0
[pid 29981] poll([{fd=3, events=POLLIN|POLLPRI}], 1, 0) = 0 (Timeout)
[pid 29981] write(6, "\0\0\0\4\200\2N.", 8) = 8
[pid 30021] <... read resumed> "\0\0\0\4", 4) = 4
[pid 30021] futex(0xf48770, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, 
NULL, 0xffffffff <unfinished ...>
[pid 29981] futex(0xf48770, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 30021] <... futex resumed> )       = -1 EAGAIN (Resource temporarily 
unavailable)
[pid 29981] <... futex resumed> )       = 0
[pid 30021] read(5, "\200\2N.", 4)      = 4
[pid 29981] select(0, NULL, NULL, NULL, {0, 1000} <unfinished ...>
[pid 30021] poll([{fd=5, events=POLLIN|POLLPRI}], 1, 0) = 0 (Timeout)
[pid 30021] madvise(0x7f719a5ad000, 8368128, MADV_DONTNEED) = 0
[pid 30021] exit(0)                     = ?
[pid 30021] +++ exited with 0 +++
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 2000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 4000}) = 0 (Timeout)
[pid 29981] select(0, NULL, NULL, NULL, {0, 8000} <unfinished ...>
[pid 30019] <... select resumed> )      = 0 (Timeout)
[pid 30019] futex(0x7f6f1c000fa0, FUTEX_WAKE_PRIVATE, 1) = 1
[pid 30020] <... futex resumed> )       = 0
[pid 30020] futex(0xf48770, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, 
NULL, 0xffffffff <unfinished ...>
[pid 30019] futex(0xf48770, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 30020] <... futex resumed> )       = -1 EAGAIN (Resource temporarily 
unavailable)
[pid 30019] <... futex resumed> )       = 0
[pid 30019] futex(0xf48770, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, 
NULL, 0xffffffff <unfinished ...>
[pid 30020] futex(0xf48770, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 30019] <... futex resumed> )       = -1 EAGAIN (Resource temporarily 
unavailable)
[pid 30019] futex(0xf48770, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, 
NULL, 0xffffffff <unfinished ...>
[pid 30020] futex(0xf48770, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 30019] <... futex resumed> )       = -1 EAGAIN (Resource temporarily 
unavailable)
[pid 30019] futex(0xf48770, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, 
NULL, 0xffffffff <unfinished ...>
[pid 30020] futex(0xf48770, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 30019] <... futex resumed> )       = -1 EAGAIN (Resource temporarily 
unavailable)
[pid 30020] futex(0xf48770, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 30020] futex(0xf48770, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, 
NULL, 0xffffffff <unfinished ...>
[pid 30019] futex(0xf48770, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 30020] <... futex resumed> )       = -1 EAGAIN (Resource temporarily 
unavailable)
[pid 30019] <... futex resumed> )       = 0
[pid 30020] write(6, "\0\0\0\4\200\2N.", 8 <unfinished ...>
[pid 30019] madvise(0x7f71995ab000, 8368128, MADV_DONTNEED <unfinished ...>
[pid 30020] <... write resumed> )       = 8
[pid 30019] <... madvise resumed> )     = 0
[pid 30020] write(4, "\0\0\0\4\200\2N.", 8 <unfinished ...>
[pid 30019] exit(0)                     = ?
[pid 30020] <... write resumed> )       = 8
[pid 30019] +++ exited with 0 +++
[pid 29981] <... select resumed> )      = 0 (Timeout)
[pid 30020] futex(0xf48770, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 29981] futex(0xf48770, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, 
NULL, 0xffffffff <unfinished ...>
[pid 30020] <... futex resumed> )       = 0
[pid 29981] <... futex resumed> )       = -1 EAGAIN (Resource temporarily 
unavailable)
[pid 29981] futex(0xf48770, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, 
NULL, 0xffffffff <unfinished ...>
[pid 30020] futex(0xf48770, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 29981] <... futex resumed> )       = -1 EAGAIN (Resource temporarily 
unavailable)
[pid 30020] <... futex resumed> )       = 0
[pid 30020] madvise(0x7f7199dac000, 8368128, MADV_DONTNEED) = 0
[pid 29981] wait4(30170,  <unfinished ...>
[pid 30020] exit(0)                     = ?
[pid 30020] +++ exited with 0 +++
<... wait4 resumed> [{WIFEXITED(s) && WEXITSTATUS(s) == 1}], WNOHANG, NULL) = 
30170
rt_sigaction(SIGINT, {SIG_DFL, [], SA_RESTORER, 0x7f71aa4fafb0}, 
{0x7f71a34401d0, [HUP INT ALRM], SA_RESTORER, 0x7f71aa4fafb0}, 8) = 0
close(3)                                = 0
munmap(0x7f71aad31000, 32)              = 0
munmap(0x7f71aad32000, 32)              = 0
close(5)                                = 0
close(6)                                = 0
munmap(0x7f71aad2f000, 32)              = 0
munmap(0x7f71aad30000, 32)              = 0
close(4)                                = 0
close(20)                               = 0
munmap(0x7f71975ab000, 33554432)        = 0
munmap(0x7f71955ab000, 33554432)        = 0
munmap(0x7f71935ab000, 33554432)        = 0
exit_group(1)                           = ?
+++ exited with 1 +++

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