[Mono-bugs] [Bug 705190] Thread start_delegate null

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=705190

https://bugzilla.novell.com/show_bug.cgi?id=705190#c2


Jo Shields <directhex at apebox.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |directhex at apebox.org

--- Comment #2 from Jo Shields <directhex at apebox.org> 2011-08-22 22:53:36 UTC ---
We've been able to reproduce this bug on someone's Debian Squeeze VPS, running
a 2.6.18 Xen kernel. It also happens on two of Ubuntu's build servers, running
2.6.24 kernels (Ubuntu 8.04, with 11.10 chroots).

The problem started in Mono commit 40d02e9a1d34542c49d5b6024e7bba7d8d831af5 -
https://github.com/mono/mono/commit/40d02e9a1d34542c49d5b6024e7bba7d8d831af5 -
an invasive change to the socket code by Gonzalo.

A full stacktrace with line numbers is as follows:




vm3703:~/mono/mono/mcs/docs# MONO_CFG_DIR=/root/mono/mono/runtime/etc
MONO_PATH="./../class/lib/net_4_0:./../class/lib/net_2_0:$MONO_PATH" gdb
./../mono/mini/mono
GNU gdb (GDB) 7.0.1-debian
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /root/mono/mono/mono/mini/mono...done.
(gdb) start ./../tools/mdoc/mdoc.exe assemble -o cs-errors -f error
cs-errors.config
Temporary breakpoint 1 at 0x805915c: file main.c, line 95.
Starting program: /root/mono/mono/mono/mini/mono ./../tools/mdoc/mdoc.exe
assemble -o cs-errors -f error cs-errors.config
[Thread debugging using libthread_db enabled]

Temporary breakpoint 1, main (argc=8, argv=0xbfffde44) at main.c:95
95              mono_build_date = build_date;
(gdb) c
Continuing.
[New Thread 0xb7ca8b70 (LWP 31079)]
[New Thread 0xb7210b70 (LWP 31080)]
[New Thread 0xb71dbb70 (LWP 31081)]
[New Thread 0xb70d6b70 (LWP 31083)]
* Assertion at threads.c:572, condition `start_delegate != NULL' not met


Program received signal SIGABRT, Aborted.
[Switching to Thread 0xb70d6b70 (LWP 31083)]
0x00b20402 in __kernel_vsyscall ()
(gdb) bt
#0  0x00b20402 in __kernel_vsyscall ()
#1  0x00179751 in *__GI_raise (sig=6) at
./nptl/sysdeps/unix/sysv/linux/raise.c:64
#2  0x0017cb82 in *__GI_abort () at abort.c:92
#3  0x0822f797 in monoeg_g_logv (log_domain=0x825a360 "",
log_level=G_LOG_LEVEL_ERROR,
    format=0x824b6a8 "* Assertion at %s:%d, condition `%s' not met\n",
args=0xb70d6244 "\316\030\060\b<\002") at goutput.c:137
#4  0x0822f7d4 in monoeg_assertion_message (format=0x824b6a8 "* Assertion at
%s:%d, condition `%s' not met\n") at goutput.c:157
#5  0x0815772c in start_wrapper_internal (data=0x856de10) at threads.c:572
#6  start_wrapper (data=0x856de10) at threads.c:617
#7  0x082137ae in thread_start_routine (args=0x8376284) at wthreads.c:290
#8  0x08220107 in inner_start_thread (arg=0x856dde0) at mono-threads-posix.c:49
#9  0x08239355 in GC_start_routine (arg=0xb7622220) at pthread_support.c:1473
#10 0x0013b955 in start_thread (arg=0xb70d6b70) at pthread_create.c:300
#11 0x0021ae7e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130
(gdb) 





The problem can be worked around by disabling EPOLL, by setting
MONO_DISABLE_AIO=1

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