Bug 5913 - csharp repl segfaulting with structs
Summary: csharp repl segfaulting with structs
Alias: None
Product: Compilers
Classification: Mono
Component: C# ()
Version: unspecified
Hardware: PC Linux
: --- normal
Target Milestone: ---
Assignee: Marek Safar
Depends on:
Reported: 2012-06-28 19:13 UTC by Jérémie Laval
Modified: 2012-09-06 15:08 UTC (History)
3 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Jérémie Laval 2012-06-28 19:13:10 UTC
Mono JIT compiler version 2.11.2 (master/72c8960 dim. juin 24 23:02:07 IST 2012)


csharp> struct A { public string foo; public int bar; }
csharp> A aStruct = new A { foo = "foo", bar = 1 };


segfault with no stacktrace. Seems to be a stack smash.

(gdb) t apply all bt

Thread 3 (Thread 0x7ffff5c64700 (LWP 12358)):
#0  0x00007ffff74cb860 in sem_wait () from /lib/libpthread.so.0
#1  0x00000000005d3608 in mono_sem_wait (sem=sem@entry=0x92f360, alertable=alertable@entry=1) at mono-semaphore.c:113
#2  0x000000000052079b in finalizer_thread (unused=unused@entry=0x0) at gc.c:1084
#3  0x00000000005a3705 in start_wrapper_internal (data=0xa4b750) at threads.c:576
#4  start_wrapper (data=0xa4b750) at threads.c:622
#5  0x00000000005cd0d9 in thread_start_routine (args=args@entry=0x9c2160) at wthreads.c:286
#6  0x00000000005d4ee9 in inner_start_thread (arg=0xa39770) at mono-threads-posix.c:49
#7  0x00000000005f34da in GC_start_routine (arg=0x7ffff5c65fc0) at pthread_support.c:1508
#8  0x00007ffff74c5e0e in start_thread () from /lib/libpthread.so.0
#9  0x00007ffff72011ed in clone () from /lib/libc.so.6

Thread 2 (Thread 0x7ffff6f19700 (LWP 12357)):
#0  0x00007ffff74c98f4 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00000000005f385c in GC_wait_marker () at pthread_support.c:1903
#2  0x00000000005ecffa in GC_help_marker (my_mark_no=10) at mark.c:1116
#3  0x00000000005f2521 in GC_mark_thread (id=0x0) at pthread_support.c:557
#4  0x00007ffff74c5e0e in start_thread () from /lib/libpthread.so.0
#5  0x00007ffff72011ed in clone () from /lib/libc.so.6

Thread 1 (Thread 0x7ffff7fbe740 (LWP 12354)):
#0  0x0000000000000001 in ?? ()
#1  0x00007ffff5081e60 in ?? ()
#2  0x00007ffff4e87f08 in ?? ()
#3  0x00007fffffffdd9f in ?? ()
#4  0x00007fffffffdd90 in ?? ()
#5  0x00007ffff7e50d70 in ?? ()
#6  0x00000000009e3788 in ?? ()
#7  0x00007ffff5302020 in ?? ()
#8  0x0000000000000000 in ?? ()
Comment 1 Marek Safar 2012-06-29 06:29:15 UTC
SRE should not crash and it does not .NET
Comment 2 Zoltan Varga 2012-06-30 20:16:46 UTC
I'm not sure why running with --security=validil doesn't catch this, but 'A' doesn't seem to be declared as a valuetype by 'csharp', i.e. its parent is 'Object'.
Comment 3 Zoltan Varga 2012-08-07 17:03:39 UTC
mareks: this seems to be an mcs problem.
Comment 4 Zoltan Varga 2012-08-15 00:09:21 UTC
-> mcs.
Comment 5 Marek Safar 2012-09-06 15:08:43 UTC
Fixed in master