#5897: GHC runtime task workers are not released with C FFI
------------------------------+---------------------------------------------
Reporter: sanketr | Owner:
Type: bug | Status: new
Priority: normal | Component: Runtime System
Version: 7.4.1 | Keywords: worker, ffi
Os: Unknown/Multiple | Architecture: x86_64 (amd64)
Failure: None/Unknown | Testcase:
Blockedby: | Blocking:
Related: 4262 |
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Comment(by sanketr):
Just figured out how to reproduce the segmentation fault/bus error I have
been seeing with more complicated code this test code is derived from. The
test code will consistently produce bus error or segmentation fault on Mac
OS 10.7.2, after twenty or so iterations, if I set nThreads in main of
T.hs to say 30. It seems to crash in pthread, during call to lock mutex in
sendSignal C code - I wonder if it is related to some kind of mutex leak
in interaction between GHC RTS and C FFI. gdb output from core below:
{{{
$ gdb ./T /cores/core.2372
GNU gdb 6.3.50-20050815 (Apple version gdb-1705) (Fri Jul 1 10:50:06 UTC
2011)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you
are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for
details.
This GDB was configured as "x86_64-apple-darwin"...Reading symbols for
shared libraries ... done
Reading symbols for shared libraries . done
Reading symbols for shared libraries ........................... done
#0 0x00007fff9321fbca in __psynch_cvwait ()
(gdb)
}}}
I can reproduce the crash consistently on quad-core iMac with "-N3"
runtime option.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5897#comment:1>
GHC <http://www.haskell.org/ghc/>
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