Hi Mikhail,
You should try our custom lldb that has support for managed frames:
https://github.com/mono/lldb-binaries
That error implies a NullReferenceException.
Is it taking the process down? Are you getting a managed exception?
If it’s taking the process down, perhaps something is highjacking mono’s signal
handler for SIGSEGV/SIGBUSS.
If it’s producing an exception, it might be an issue on our code.
Keep in mind that lldb cannot debug through signals on OSX, it’s a well known
problem that they don’t care about fixing. (
Perhaps you can try running mono with MONO_DEBUG=explicit-null-checks to
work-around lldb or someone stealing our signal handler and find the actual
culprit.
Finally, in case this is an actual bug on mono, the code that generates the
cominterop-invoke lives in mono/metadata/cominterop.c and I’d suggest you
digging there to see what’s going wrong.
--
Rodrigo
On 5/21/17, 6:41 AM, "Mono-devel-list on behalf of Mikhail Filippov"
<mono-devel-list-boun...@lists.dot.net on behalf of mikh...@filippov.me> wrote:
Hi, all. We have a native crash in mono:
(lldb) bt
* thread #15, name = 'tid_4303', stop reason = EXC_BAD_ACCESS (code=1,
address=0x0)
* frame #0: 0x0000000000000000
frame #1: 0x000000010a319fe1
frame #2: 0x0000000109300fd3
frame #3: 0x000000010a314a96
frame #4: 0x00000001093725a1
libmscordbi.dylib`ShimProxyCallback::QueueCreateProcess(this=0x00000001036ddcb0,
args=(m_pCallback1 = 0x00000001036d8110, m_pCallback2 = 0x00000001036da7f0,
m_pCallback3 =
0x00000001036da440))::CreateProcessEvent::Dispatch(ManagedEvent::DispatchArgs)
at shimcallback.cpp:348
frame #5: 0x0000000109411a88
libmscordbi.dylib`CordbProcess::DispatchRCEvent(this=0x0000000105180400) at
process.cpp:4692
frame #6: 0x000000010942ea03
libmscordbi.dylib`CordbRCEventThread::FlushQueuedEvents(this=0x00000001036d2580,
process=0x0000000105180400) at process.cpp:10270
frame #7: 0x000000010942f80d
libmscordbi.dylib`CordbRCEventThread::ThreadProc(this=0x00000001036d2580) at
process.cpp:10525
frame #8: 0x000000010942fbac
libmscordbi.dylib`CordbRCEventThread::ThreadProc(parameter=0x00000001036d2580)
at process.cpp:10591
frame #9: 0x0000000109dfe004
libmscordaccore.dylib`CorUnix::CPalThread::ThreadEntry(pvParam=0x0000000105182e00)
at thread.cpp:1730
frame #10: 0x00007fffcfd2b93b libsystem_pthread.dylib`_pthread_body +
180
frame #11: 0x00007fffcfd2b887 libsystem_pthread.dylib`_pthread_start +
286
frame #12: 0x00007fffcfd2b08d libsystem_pthread.dylib`thread_start + 13
(lldb) pmip 0x000000010a314a96
IP 0x10a314a96 at offset 0x206 of method (wrapper native-to-managed)
JetBrains.Debugger.CorApi.ComInterop.ICorDebugManagedCallback:CreateProcess
(intptr,intptr) (0x10a314890 0x10a314b82)[domain 0x10060e720 -
JetBrains.Debugger.Mono.Tests.exe]
(lldb) pmip 0x0000000109300fd3
IP 0x109300fd3 at offset 0x63 of method
JetBrains.Debugger.CorApi.ComInterop.Eventing.ManagedCallbackEventSink:JetBrains.Debugger.CorApi.ComInterop.ICorDebugManagedCallback.CreateProcess
(JetBrains.Debugger.CorApi.ComInterop.ICorDebugProcess) (0x109300f70
0x109300fd8)[domain 0x10060e720 - JetBrains.Debugger.Mono.Tests.exe]
(lldb) pmip 0x000000010a319fe1
IP 0x10a319fe1 at offset 0x31 of method (wrapper cominterop-invoke)
JetBrains.Debugger.CorApi.ComInterop.ICorDebugController:Continue (int)
(0x10a319fb0 0x10a31a038)[domain 0x10060e720 -
JetBrains.Debugger.Mono.Tests.exe]
We have a stable reproduce for its problem. We are using mono master
branch. In another test case ICorDebugController:Continue worked correctly. We
cannot find the reason for this behaviour.
Could somebody help us to debug the problem?
--
Mikhail Filippov
Software Developer
JetBrains
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