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From: Linas Vepstas <linasvepstas@HIDDEN>
Date: Wed, 5 Dec 2018 20:40:20 -0600
Message-ID: <CAHrUA37oy7NgytspabAPPCzZhbQLEHVZGL-EgYyJZbG+S0DkLQ@HIDDEN>
Subject: guile-2.9.1 multi-threading crash
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--00000000000048672d057c516c22
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The following bug report is informal, without any simple test, right now.
Very reproducible, though.
I have a unit test (it passes with guile-2.2) that creates 120 threads and
races them as fast as possible, each thread launched from C++, entering
guile, and then from guile, calling some wrappered C++ code. With 2.9.1,
the test crashes about half the time, always with the same stack trace
```
(gdb) info threads
Id Target Id Frame
1 Thread 0x7ffff7fdcbc0 (LWP 24595) "MultiThreadUTes"
0x00007ffff7bc298d in pthread_join (threadid=140737247344384,
thread_return=0x0)
at pthread_join.c:90
```
and most of the rest in `__lll_lock_wait` (that my c++ code asks for) or
`pthread_cond_wait@@GLIBC_2.3.2` from GC_wait_marker. The stack trace
itself is useless; the core issue is the `thread_return=0x0` above.
```
(gdb) bt
#0 0x00007ffdb03c7040 in ?? ()
#1 0x0000000000000001 in ?? ()
#2 0x00007ffff40a553c in __GI___libc_free (mem=<optimized out>)
at malloc.c:2968
#3 0x0000000000000000 in ?? ()
```
Its hard to see what this has to do with guile, other than that this test
has been run thousands of times on guile-2.2 without issues.
(Reproducible by running the "MultiThreadUTest" of
https://github.com/opencog/atomspace)
-- Linas
--
cassette tapes - analog TV - film cameras - you
--00000000000048672d057c516c22
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div><b=
r></div>The following bug report is informal, without any simple test, righ=
t now. Very reproducible, though. <br><br>I have a unit test (it passes wit=
h guile-2.2) that creates 120 threads and races them as fast as possible, e=
ach thread launched from C++, entering guile, and then from guile, calling =
some wrappered C++ code. With 2.9.1, the test crashes about half the time, =
always with the same stack trace<br>```<br>(gdb) info threads<br>=C2=A0 Id=
=C2=A0=C2=A0 Target Id=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Fram=
e<br>=C2=A0 1=C2=A0=C2=A0=C2=A0 Thread 0x7ffff7fdcbc0 (LWP 24595) "Mul=
tiThreadUTes"<br>0x00007ffff7bc298d in pthread_join (threadid=3D140737=
247344384,<br>thread_return=3D0x0)<br>=C2=A0=C2=A0=C2=A0 at pthread_join.c:=
90<br>```<br>and most of the rest in `__lll_lock_wait` (that my c++ code as=
ks for) or `pthread_cond_wait@@GLIBC_2.3.2` from GC_wait_marker. The stack =
trace itself is useless; the core issue is the `thread_return=3D0x0` above.=
<br>```<br>(gdb) bt<br>#0=C2=A0 0x00007ffdb03c7040 in ?? ()<br>#1=C2=A0 0x0=
000000000000001 in ?? ()<br>#2=C2=A0 0x00007ffff40a553c in __GI___libc_free=
(mem=3D<optimized out>)<br>=C2=A0=C2=A0=C2=A0 at malloc.c:2968<br>#3=
=C2=A0 0x0000000000000000 in ?? ()<br>```<br>Its hard to see what this has =
to do with guile, other than that this test has been run thousands of times=
on guile-2.2 without issues.<br><br></div><div>(Reproducible by running th=
e "MultiThreadUTest" of <a href=3D"https://github.com/opencog/ato=
mspace">https://github.com/opencog/atomspace</a>)<br><br clear=3D"all"></di=
v><div dir=3D"ltr"><div>-- Linas<br></div><div>-- <br><div dir=3D"ltr" clas=
s=3D"gmail_signature"><div dir=3D"ltr">cassette tapes - analog TV - film ca=
meras - you<br></div></div></div></div></div></div></div>
--00000000000048672d057c516c22--
linasvepstas@HIDDEN:bug-guile@HIDDEN.
Full text available.bug-guile@HIDDEN:bug#33641; Package guile.
Full text available.
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1994-97 Ian Jackson.