[Mono-bugs] [Bug 389585] New: SIGSEGV

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Mon May 12 18:31:22 EDT 2008


https://bugzilla.novell.com/show_bug.cgi?id=389585


           Summary: SIGSEGV
           Product: Mono: Runtime
           Version: 1.9.0
          Platform: x86-64
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: misc
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: wasabi at larvalstage.net
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


This is from branches/mono-1.9. I honestly cannot reproduce this, as I can't
identify the complexity I'm doing to cause it. I have many threads, many
appdomains, and it crashes around the time I make a call to Process.Start and 
WaitForExit. I hope the stack trace can help you find the code path.

I will run it with whatever other options you might want to identify the
problem. As far as the native traces below, it looks like every thread is stuck
in some pthread related stuff. Disabling SMP does not solve it.



Stacktrace:


Native stacktrace:

        /home/jhaltom/.local/opt/mono/bin/mono [0x533b07]
        /home/jhaltom/.local/opt/mono/bin/mono [0x440c8d]
        /lib/libpthread.so.0 [0x7fa5ce12f7d0]
        /home/jhaltom/.local/opt/mono/bin/mono [0x532b69]
        /home/jhaltom/.local/opt/mono/bin/mono [0x533435]
        [0x404b3ac5]

Debug info from gdb:

[Thread debugging using libthread_db enabled]
[New Thread 0x7fa5cee0a7a0 (LWP 4826)]
[New Thread 0x433d1950 (LWP 4858)]
[New Thread 0x42dce950 (LWP 4857)]
[New Thread 0x435d2950 (LWP 4856)]
[New Thread 0x439f4950 (LWP 4845)]
[New Thread 0x431d0950 (LWP 4840)]
[New Thread 0x42fcf950 (LWP 4839)]
[New Thread 0x42bcd950 (LWP 4837)]
[New Thread 0x427bb950 (LWP 4835)]
[New Thread 0x425ba950 (LWP 4834)]
[New Thread 0x423b9950 (LWP 4833)]
[New Thread 0x421a8950 (LWP 4832)]
[New Thread 0x41f38950 (LWP 4831)]
[New Thread 0x41c3a950 (LWP 4830)]
[New Thread 0x41991950 (LWP 4828)]
[New Thread 0x411ad950 (LWP 4827)]
0x00007fa5ce12e5cb in read () from /lib/libpthread.so.0
  16 Thread 0x411ad950 (LWP 4827)  0x00007fa5ce12ee81 in nanosleep ()
   from /lib/libpthread.so.0
  15 Thread 0x41991950 (LWP 4828)  0x00007fa5ce12bb99 in
pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
  14 Thread 0x41c3a950 (LWP 4830)  0x00007fa5cdc07b6b in read ()
   from /lib/libc.so.6
  13 Thread 0x41f38950 (LWP 4831)  0x00007fa5ce12be1d in
pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
  12 Thread 0x421a8950 (LWP 4832)  0x00007fa5ce12be1d in
pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
  11 Thread 0x423b9950 (LWP 4833)  0x00007fa5cdc160f8 in epoll_wait ()
   from /lib/libc.so.6
  10 Thread 0x425ba950 (LWP 4834)  0x00007fa5ce12be1d in
pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
  9 Thread 0x427bb950 (LWP 4835)  0x00007fa5ce12be1d in
pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
  8 Thread 0x42bcd950 (LWP 4837)  0x00007fa5ce12be1d in
pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
  7 Thread 0x42fcf950 (LWP 4839)  0x00007fa5cdc0eda2 in select ()
   from /lib/libc.so.6
  6 Thread 0x431d0950 (LWP 4840)  0x00007fa5ce12be1d in
pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
  5 Thread 0x439f4950 (LWP 4845)  0x00007fa5ce12be1d in
pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
  4 Thread 0x435d2950 (LWP 4856)  0x00007fa5ce12be1d in
pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
  3 Thread 0x42dce950 (LWP 4857)  0x00007fa5ce12be1d in
pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
  2 Thread 0x433d1950 (LWP 4858)  0x00007fa5ce12be1d in
pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
  1 Thread 0x7fa5cee0a7a0 (LWP 4826)  0x00007fa5ce12e5cb in read ()
   from /lib/libpthread.so.0

Thread 16 (Thread 0x411ad950 (LWP 4827)):
#0  0x00007fa5ce12ee81 in nanosleep () from /lib/libpthread.so.0
#1  0x00000000004dc7ef in collection_thread (unused=<value optimized out>)
    at collection.c:34
#2  0x00007fa5ce1273f7 in start_thread () from /lib/libpthread.so.0
#3  0x00007fa5cdc15b2d in clone () from /lib/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 15 (Thread 0x41991950 (LWP 4828)):
#0  0x00007fa5ce12bb99 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#1  0x00000000004def15 in timedwait_signal_poll_cond (cond=0x7fa5cc9b7268, 
    mutex=0x7fa5cc9b7240, timeout=0x57, alertable=-1) at handles.c:1443
#2  0x00000000004e14c7 in _wapi_handle_timedwait_signal_handle (
    handle=<value optimized out>, timeout=0x0, alertable=43) at handles.c:1523
#3  0x00000000004dcf23 in WaitForSingleObjectEx (handle=0x404, 
    timeout=4294967295, alertable=0) at wait.c:200
#4  0x00000000004cc4a1 in finalizer_thread (unused=<value optimized out>)
    at gc.c:894
#5  0x0000000000469bec in start_wrapper (data=<value optimized out>)
    at threads.c:589
#6  0x00000000004d2493 in thread_start_routine (args=0x7fa5cc84f4a0)
    at threads.c:282
#7  0x00000000004edba2 in GC_start_routine (arg=<value optimized out>)
    at pthread_support.c:1369
#8  0x00007fa5ce1273f7 in start_thread () from /lib/libpthread.so.0
#9  0x00007fa5cdc15b2d in clone () from /lib/libc.so.6
#10 0x0000000000000000 in ?? ()

Thread 14 (Thread 0x41c3a950 (LWP 4830)):
#0  0x00007fa5cdc07b6b in read () from /lib/libc.so.6
#1  0x0000000041f7ad3a in ?? ()
#2  0x0000000000c77100 in ?? ()
#3  0x0000000041c39f68 in ?? ()
#4  0x0000000041c39ed0 in ?? ()
#5  0x00007fa5cbdbbcf0 in ?? ()
#6  0x0000000041c39f68 in ?? ()
#7  0x0000000041c39ed0 in ?? ()
#8  0x0000000041c39db0 in ?? ()
#9  0x00007fa5cbdbbcf0 in ?? ()
#10 0x0000000000000000 in ?? ()

Thread 13 (Thread 0x41f38950 (LWP 4831)):
#0  0x00007fa5ce12be1d in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#1  0x00000000004def00 in timedwait_signal_poll_cond (cond=0x7fa5cc9b8940, 
    mutex=0x7fa5cc9b8918, timeout=0x41f37d10, alertable=<value optimized out>)
    at handles.c:1453
#2  0x00000000004e14c7 in _wapi_handle_timedwait_signal_handle (
    handle=<value optimized out>, timeout=0x41f37d10, alertable=373)
    at handles.c:1523
#3  0x00000000004dcdd8 in WaitForSingleObjectEx (handle=0x42f, timeout=300000, 
    alertable=1) at wait.c:202
#4  0x000000000049885a in ves_icall_System_Threading_Monitor_Monitor_wait (
    obj=0x7fa5cec63e20, ms=300000) at monitor.c:855
#5  0x000000004025383c in ?? ()
#6  0x0000000000c9b2a0 in ?? ()
#7  0x0000000041f37688 in ?? ()
#8  0x0000000000000040 in ?? ()
#9  0x00000000402537cf in ?? ()
#10 0x0000000041f37f68 in ?? ()
#11 0x0000000041f37ed0 in ?? ()
#12 0x0000000041f37d90 in ?? ()
#13 0x00007fa5cbdbbb80 in ?? ()
#14 0x0000000000000000 in ?? ()

Thread 12 (Thread 0x421a8950 (LWP 4832)):
#0  0x00007fa5ce12be1d in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#1  0x00000000004def00 in timedwait_signal_poll_cond (cond=0x7fa5cc9b7f28, 
    mutex=0x7fa5cc9b7f00, timeout=0x421a7c10, alertable=<value optimized out>)
    at handles.c:1453
#2  0x00000000004e14c7 in _wapi_handle_timedwait_signal_handle (
    handle=<value optimized out>, timeout=0x421a7c10, alertable=422)
    at handles.c:1523
#3  0x00000000004dcdd8 in WaitForSingleObjectEx (handle=0x41c, timeout=899995, 
    alertable=1) at wait.c:202
#4  0x0000000000467413 in
ves_icall_System_Threading_WaitHandle_WaitOne_internal (this=<value optimized
out>, handle=0x41c, ms=899995, 
    exitContext=<value optimized out>) at threads.c:1385
#5  0x0000000040ce7497 in ?? ()
#6  0x0000000001bd83a0 in ?? ()
#7  0x0000000000000001 in ?? ()
#8  0x00000000421a7c50 in ?? ()
#9  0x0000000040ce73f8 in ?? ()
#10 0x00000000421a7f68 in ?? ()
#11 0x00000000421a7d40 in ?? ()
#12 0x00000000421a7c70 in ?? ()
#13 0x00007fa5ca0428f8 in ?? ()
#14 0x0000000000000000 in ?? ()

Thread 11 (Thread 0x423b9950 (LWP 4833)):
#0  0x00007fa5cdc160f8 in epoll_wait () from /lib/libc.so.6
#1  0x0000000000483765 in socket_io_epoll_main (p=<value optimized out>)
    at threadpool.c:552
#2  0x0000000000469bec in start_wrapper (data=<value optimized out>)
    at threads.c:589
#3  0x00000000004d2493 in thread_start_routine (args=0x7fa5cc84fb08)
    at threads.c:282
#4  0x00000000004edba2 in GC_start_routine (arg=<value optimized out>)
    at pthread_support.c:1369
#5  0x00007fa5ce1273f7 in start_thread () from /lib/libpthread.so.0
#6  0x00007fa5cdc15b2d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 10 (Thread 0x425ba950 (LWP 4834)):
#0  0x00007fa5ce12be1d in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#1  0x00000000004def00 in timedwait_signal_poll_cond (cond=0x7fa5cc9bbff8, 
    mutex=0x7fa5cc9bbfd0, timeout=0x425b9c90, alertable=<value optimized out>)
    at handles.c:1453
#2  0x00000000004e14c7 in _wapi_handle_timedwait_signal_handle (
    handle=<value optimized out>, timeout=0x425b9c90, alertable=11)
    at handles.c:1523
#3  0x00000000004dcdd8 in WaitForSingleObjectEx (handle=0x496, 
    timeout=1728000000, alertable=1) at wait.c:202
#4  0x0000000000467413 in
ves_icall_System_Threading_WaitHandle_WaitOne_internal (this=<value optimized
out>, handle=0x496, ms=1728000000, 
    exitContext=<value optimized out>) at threads.c:1385
#5  0x0000000040c87b87 in ?? ()
#6  0x00000000012b6cd0 in ?? ()
#7  0x0000000000000001 in ?? ()
#8  0x0000000000000000 in ?? ()

Thread 9 (Thread 0x427bb950 (LWP 4835)):
#0  0x00007fa5ce12be1d in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#1  0x00000000004def00 in timedwait_signal_poll_cond (cond=0x7fa5cc9b8478, 
    mutex=0x7fa5cc9b8450, timeout=0x427bac10, alertable=<value optimized out>)
    at handles.c:1453
#2  0x00000000004e14c7 in _wapi_handle_timedwait_signal_handle (
    handle=<value optimized out>, timeout=0x427bac10, alertable=396)
    at handles.c:1523
#3  0x00000000004dcdd8 in WaitForSingleObjectEx (handle=0x426, timeout=59993, 
    alertable=1) at wait.c:202
#4  0x0000000000467413 in
ves_icall_System_Threading_WaitHandle_WaitOne_internal (this=<value optimized
out>, handle=0x426, ms=59993, 
    exitContext=<value optimized out>) at threads.c:1385
#5  0x0000000040c87b87 in ?? ()
#6  0x000000000081f590 in ?? ()
#7  0x0000000000000001 in ?? ()
#8  0x00000000427bac50 in ?? ()
#9  0x0000000040c879b2 in ?? ()
#10 0x00000000427baf68 in ?? ()
#11 0x00000000427bad40 in ?? ()
#12 0x00000000427bac70 in ?? ()
#13 0x00007fa5c891c8f8 in ?? ()
#14 0x0000000000000000 in ?? ()

Thread 8 (Thread 0x42bcd950 (LWP 4837)):
#0  0x00007fa5ce12be1d in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#1  0x00000000004def00 in timedwait_signal_poll_cond (cond=0x7fa5cc9b87a8, 
    mutex=0x7fa5cc9b8780, timeout=0x42bccc10, alertable=<value optimized out>)
    at handles.c:1453
#2  0x00000000004e14c7 in _wapi_handle_timedwait_signal_handle (
    handle=<value optimized out>, timeout=0x42bccc10, alertable=376)
    at handles.c:1523
#3  0x00000000004dcdd8 in WaitForSingleObjectEx (handle=0x42c, timeout=10000, 
    alertable=1) at wait.c:202
#4  0x0000000000467413 in
ves_icall_System_Threading_WaitHandle_WaitOne_internal (this=<value optimized
out>, handle=0x42c, ms=10000, 
    exitContext=<value optimized out>) at threads.c:1385
#5  0x0000000041cc6227 in ?? ()
#6  0x00000000014cc640 in ?? ()
#7  0x0000000000000001 in ?? ()
#8  0x0000000042bccc50 in ?? ()
#9  0x0000000041cc6182 in ?? ()
#10 0x0000000042bccf68 in ?? ()
#11 0x0000000042bccd40 in ?? ()
#12 0x0000000042bccc70 in ?? ()
#13 0x00007fa5c891c290 in ?? ()
#14 0x0000000000000000 in ?? ()

Thread 7 (Thread 0x42fcf950 (LWP 4839)):
#0  0x00007fa5cdc0eda2 in select () from /lib/libc.so.6
#1  0x00007fa5ce5ab9bc in g_spawn_sync () from /usr/lib/libglib-2.0.so.0
#2  0x00007fa5ce5abd98 in g_spawn_command_line_sync ()
   from /usr/lib/libglib-2.0.so.0
#3  0x0000000000533b99 in mono_handle_native_sigsegv (
    signal=<value optimized out>, ctx=<value optimized out>)
    at mini-exceptions.c:1044
#4  0x0000000000440c8d in mono_arch_handle_altstack_exception (
    sigctx=0x7fa5c32e1c40, fault_addr=<value optimized out>, stack_ovf=0)
    at exceptions-amd64.c:862
#5  <signal handler called>
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Thread 6 (Thread 0x431d0950 (LWP 4840)):
#0  0x00007fa5ce12be1d in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#1  0x00000000004def00 in timedwait_signal_poll_cond (cond=0x7fa5cc9b7048, 
    mutex=0x7fa5cc9b7020, timeout=0x431cfee0, alertable=<value optimized out>)
    at handles.c:1453
#2  0x00000000004e14c7 in _wapi_handle_timedwait_signal_handle (
    handle=<value optimized out>, timeout=0x431cfee0, alertable=727)
    at handles.c:1523
#3  0x00000000004dcdd8 in WaitForSingleObjectEx (handle=0x400, timeout=10000, 
    alertable=1) at wait.c:202
#4  0x0000000000484dc3 in async_invoke_thread (data=0xffffffffffffffff)
    at threadpool.c:1226
#5  0x0000000000469bec in start_wrapper (data=<value optimized out>)
    at threads.c:589
#6  0x00000000004d2493 in thread_start_routine (args=0x7fa5cc850400)
    at threads.c:282
#7  0x00000000004edba2 in GC_start_routine (arg=<value optimized out>)
    at pthread_support.c:1369
#8  0x00007fa5ce1273f7 in start_thread () from /lib/libpthread.so.0
#9  0x00007fa5cdc15b2d in clone () from /lib/libc.so.6
#10 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x439f4950 (LWP 4845)):
#0  0x00007fa5ce12be1d in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#1  0x00000000004def00 in timedwait_signal_poll_cond (cond=0x7fa5cc9b9138, 
    mutex=0x7fa5cc9b9110, timeout=0x439f3c10, alertable=<value optimized out>)
    at handles.c:1453
#2  0x00000000004e14c7 in _wapi_handle_timedwait_signal_handle (
    handle=<value optimized out>, timeout=0x439f3c10, alertable=315)
    at handles.c:1523
#3  0x00000000004dcdd8 in WaitForSingleObjectEx (handle=0x43e, timeout=10000, 
    alertable=1) at wait.c:202
#4  0x0000000000467413 in
ves_icall_System_Threading_WaitHandle_WaitOne_internal (this=<value optimized
out>, handle=0x43e, ms=10000, 
    exitContext=<value optimized out>) at threads.c:1385
#5  0x00000000401452f7 in ?? ()
#6  0x0000000000fb1b10 in ?? ()
#7  0x0000000000000001 in ?? ()
#8  0x00000000439f3c50 in ?? ()
#9  0x0000000040145102 in ?? ()
#10 0x00000000439f3f68 in ?? ()
#11 0x00000000439f3d40 in ?? ()
#12 0x00000000439f3c70 in ?? ()
#13 0x00007fa5ca042e18 in ?? ()
#14 0x0000000000000000 in ?? ()

Thread 4 (Thread 0x435d2950 (LWP 4856)):
#0  0x00007fa5ce12be1d in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#1  0x00000000004def00 in timedwait_signal_poll_cond (cond=0x7fa5cc9b81d0, 
    mutex=0x7fa5cc9b81a8, timeout=0x435d1ee0, alertable=<value optimized out>)
    at handles.c:1453
#2  0x00000000004e14c7 in _wapi_handle_timedwait_signal_handle (
    handle=<value optimized out>, timeout=0x435d1ee0, alertable=1588)
    at handles.c:1523
#3  0x00000000004dcdd8 in WaitForSingleObjectEx (handle=0x421, timeout=10000, 
    alertable=1) at wait.c:202
#4  0x0000000000484c77 in async_invoke_io_thread (data=0x0) at threadpool.c:284
#5  0x0000000000469bec in start_wrapper (data=<value optimized out>)
    at threads.c:589
#6  0x00000000004d2493 in thread_start_routine (args=0x7fa5cc850e40)
    at threads.c:282
#7  0x00000000004edba2 in GC_start_routine (arg=<value optimized out>)
    at pthread_support.c:1369
#8  0x00007fa5ce1273f7 in start_thread () from /lib/libpthread.so.0
#9  0x00007fa5cdc15b2d in clone () from /lib/libc.so.6
#10 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x42dce950 (LWP 4857)):
#0  0x00007fa5ce12be1d in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#1  0x00000000004def00 in timedwait_signal_poll_cond (cond=0x7fa5cc9b7048, 
    mutex=0x7fa5cc9b7020, timeout=0x42dcdee0, alertable=<value optimized out>)
    at handles.c:1453
#2  0x00000000004e14c7 in _wapi_handle_timedwait_signal_handle (
    handle=<value optimized out>, timeout=0x42dcdee0, alertable=728)
    at handles.c:1523
#3  0x00000000004dcdd8 in WaitForSingleObjectEx (handle=0x400, timeout=10000, 
    alertable=1) at wait.c:202
#4  0x0000000000484dc3 in async_invoke_thread (data=0xffffffffffffffff)
    at threadpool.c:1226
#5  0x0000000000469bec in start_wrapper (data=<value optimized out>)
    at threads.c:589
#6  0x00000000004d2493 in thread_start_routine (args=0x7fa5cc850f88)
    at threads.c:282
#7  0x00000000004edba2 in GC_start_routine (arg=<value optimized out>)
    at pthread_support.c:1369
#8  0x00007fa5ce1273f7 in start_thread () from /lib/libpthread.so.0
#9  0x00007fa5cdc15b2d in clone () from /lib/libc.so.6
#10 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x433d1950 (LWP 4858)):
#0  0x00007fa5ce12be1d in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#1  0x00000000004def00 in timedwait_signal_poll_cond (cond=0x7fa5cc9b81d0, 
    mutex=0x7fa5cc9b81a8, timeout=0x433d0ee0, alertable=<value optimized out>)
    at handles.c:1453
#2  0x00000000004e14c7 in _wapi_handle_timedwait_signal_handle (
    handle=<value optimized out>, timeout=0x433d0ee0, alertable=1589)
    at handles.c:1523
#3  0x00000000004dcdd8 in WaitForSingleObjectEx (handle=0x421, timeout=10000, 
    alertable=1) at wait.c:202
#4  0x0000000000484c77 in async_invoke_io_thread (data=0x0) at threadpool.c:284
#5  0x0000000000469bec in start_wrapper (data=<value optimized out>)
    at threads.c:589
#6  0x00000000004d2493 in thread_start_routine (args=0x7fa5cc8510d0)
    at threads.c:282
#7  0x00000000004edba2 in GC_start_routine (arg=<value optimized out>)
    at pthread_support.c:1369
#8  0x00007fa5ce1273f7 in start_thread () from /lib/libpthread.so.0
#9  0x00007fa5cdc15b2d in clone () from /lib/libc.so.6
#10 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fa5cee0a7a0 (LWP 4826)):
#0  0x00007fa5ce12e5cb in read () from /lib/libpthread.so.0
#1  0x00000000004d8463 in console_read (handle=<value optimized out>, 
    buffer=0x7fa5cbd84020, numbytes=1024, bytesread=0x7fffd6e2983c, 
    overlapped=<value optimized out>) at io.c:1069
#2  0x000000000053b5ad in ves_icall_System_IO_MonoIO_Read (handle=0x0, 
    dest=<value optimized out>, dest_offset=-512, count=-689793032, 
    error=0x7fffd6e2990c) at file-io.c:701
#3  0x000000004096f606 in ?? ()
#4  0x00007fffd6e29da0 in ?? ()
#5  0x0000000000000000 in ?? ()
#0  0x00007fa5ce12e5cb in read () from /lib/libpthread.so.0


=================================================================
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries 
used by your application.
=================================================================

Aborted


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