New submission from Omer Katz:
I have found what appears to be a segfualt in time.sleep but I'm not sure.
I have verified that the segfualt occurs both on Python 2.7.8 and 3.4.2.
The following program that reproduces the segfault uses my fork of billiard, a
replacement for the multiprocessing module that is used by celery.
In order to install: pip install
git+https://github.com/thedrow/billiard@topic/dill-with-threads
The program:
from billiard.pool import ThreadPool
p1 = ThreadPool()
class Foo(object):
def a(self):
print(a)
return 1
def do(self):
return p1.apply_async(self.a)
foo = Foo()
r = foo.do()
print(r.get())
p1.close()
p1.join()
The output from gdb:
gdb -ex r -q --args python mt_example.py
Reading symbols from python...done.
Starting program: /home/omer/.virtualenvs/billiard/bin/python mt_example.py
[Thread debugging using libthread_db enabled]
Using host libthread_db library /lib/x86_64-linux-gnu/libthread_db.so.1.
[New Thread 0x731db700 (LWP 2897)]
[New Thread 0x729da700 (LWP 2898)]
[New Thread 0x721d9700 (LWP 2899)]
[New Thread 0x719d8700 (LWP 2900)]
[New Thread 0x711d7700 (LWP 2901)]
[New Thread 0x709d6700 (LWP 2902)]
[New Thread 0x7fffdbfff700 (LWP 2903)]
Program received signal SIGTERM, Terminated.
[Switching to Thread 0x721d9700 (LWP 2899)]
0x771dc1c3 in select () at ../sysdeps/unix/syscall-template.S:81
81 ../sysdeps/unix/syscall-template.S: No such file or directory.
(gdb) bt
#0 0x771dc1c3 in select () at ../sysdeps/unix/syscall-template.S:81
#1 0x75fd5d5d in floatsleep (secs=optimized out) at
Modules/timemodule.c:948
#2 time_sleep (self=optimized out, args=optimized out) at
Modules/timemodule.c:206
#3 0x004b658c in call_function (oparg=optimized out,
pp_stack=0x721d8540) at Python/ceval.c:4033
#4 PyEval_EvalFrameEx (f=f@entry=0x7463eda8, throwflag=throwflag@entry=0)
at Python/ceval.c:2679
#5 0x004b6f6b in PyEval_EvalCodeEx (co=optimized out,
globals=optimized out, locals=locals@entry=0x0, args=optimized out,
argcount=argcount@entry=4, kws=optimized out, kwcount=0,
defs=0x740bab68, defcount=1, closure=0x0) at Python/ceval.c:3265
#6 0x004b5b28 in fast_function (nk=optimized out, na=4, n=optimized
out, pp_stack=0x721d8730, func=0x731e2938)
at Python/ceval.c:4129
#7 call_function (oparg=optimized out, pp_stack=0x721d8730) at
Python/ceval.c:4054
#8 PyEval_EvalFrameEx (f=f@entry=0x7fffe8000b50, throwflag=throwflag@entry=0)
at Python/ceval.c:2679
#9 0x004b6f6b in PyEval_EvalCodeEx (co=optimized out,
globals=optimized out, locals=locals@entry=0x0, args=optimized out,
argcount=argcount@entry=1, kws=optimized out, kwcount=0, defs=0x0,
defcount=0, closure=0x0) at Python/ceval.c:3265
#10 0x004b5b28 in fast_function (nk=optimized out, na=1, n=optimized
out, pp_stack=0x721d8920, func=0x731e28c0)
at Python/ceval.c:4129
#11 call_function (oparg=optimized out, pp_stack=0x721d8920) at
Python/ceval.c:4054
#12 PyEval_EvalFrameEx (f=f@entry=0x7fffe8000910, throwflag=throwflag@entry=0)
at Python/ceval.c:2679
#13 0x004b5bc7 in fast_function (nk=optimized out, na=1, n=optimized
out, pp_stack=0x721d8a70, func=0x77e55230)
---Type return to continue, or q return to quit---
at Python/ceval.c:4119
#14 call_function (oparg=optimized out, pp_stack=0x721d8a70) at
Python/ceval.c:4054
#15 PyEval_EvalFrameEx (f=f@entry=0x731f1210, throwflag=throwflag@entry=0)
at Python/ceval.c:2679
#16 0x004b6f6b in PyEval_EvalCodeEx (co=optimized out,
globals=optimized out, locals=locals@entry=0x0,
args=args@entry=0x731dca68, argcount=optimized out,
kws=kws@entry=0x0, kwcount=kwcount@entry=0, defs=defs@entry=0x0,
defcount=defcount@entry=0, closure=0x0) at Python/ceval.c:3265
#17 0x00529e70 in function_call (func=0x77e55140,
arg=0x731dca50, kw=0x0) at Objects/funcobject.c:526
#18 0x00422f5a in PyObject_Call (func=func@entry=0x77e55140,
arg=arg@entry=0x731dca50, kw=kw@entry=0x0)
at Objects/abstract.c:2529
#19 0x0042747d in instancemethod_call (func=0x77e55140,
arg=0x731dca50, kw=0x0) at Objects/classobject.c:2602
#20 0x00422f5a in PyObject_Call (func=func@entry=0x74636d70,
arg=arg@entry=0x77f93050, kw=optimized out)
at Objects/abstract.c:2529
#21 0x004b07f7 in PyEval_CallObjectWithKeywords (func=0x74636d70,
arg=0x77f93050, kw=optimized out) at Python/ceval.c:3902
#22 0x004fae92 in t_bootstrap (boot_raw=0x8899c0) at
./Modules/threadmodule.c:614
#23 0x77bc40a5 in start_thread (arg=0x721d9700) at
pthread_create.c:309
#24 0x771e484d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111
--
components: Interpreter Core
messages: 232059
nosy: Omer.Katz
priority: normal
severity: normal
status: open
title: Segfault on time.sleep
type:
