runtime: Several tests fail on mono with mono_threads_pthread_kill: pthread_kill failed with error 11

From https://github.com/dotnet/runtime/pull/32364 on:

• netcoreapp5.0-Linux-Debug-x64-Mono_release-Ubuntu.1804.Amd64.Open

See https://dev.azure.com/dnceng/public/_build/results?buildId=522989&view=logs&j=b4344b0d-0f92-5d69-ccaf-e0b24fbf14a2&t=555ea487-e6f6-5e9e-ac96-b1fa34f2540d&l=98

Test areas that fail: https://helix.dot.net/api/2019-06-17/jobs/049bba5a-3a50-4308-8d4f-043b35a7a750/workitems/System.IO.FileSystem.Tests/console https://helix.dot.net/api/2019-06-17/jobs/049bba5a-3a50-4308-8d4f-043b35a7a750/workitems/System.Linq.Queryable.Tests/console https://helix.dot.net/api/2019-06-17/jobs/049bba5a-3a50-4308-8d4f-043b35a7a750/workitems/System.Net.Primitives.Functional.Tests/console https://helix.dot.net/api/2019-06-17/jobs/049bba5a-3a50-4308-8d4f-043b35a7a750/workitems/System.Net.ServicePoint.Tests/console https://helix.dot.net/api/2019-06-17/jobs/049bba5a-3a50-4308-8d4f-043b35a7a750/workitems/System.Threading.Timer.Tests/console https://helix.dot.net/api/2019-06-17/jobs/049bba5a-3a50-4308-8d4f-043b35a7a750/workitems/System.Xml.Linq.xNodeReader.Tests/console https://helix.dot.net/api/2019-06-17/jobs/049bba5a-3a50-4308-8d4f-043b35a7a750/workitems/System.Xml.RW.XmlWriterApi.Tests/console

For example: https://helix.dot.net/api/2019-06-17/jobs/049bba5a-3a50-4308-8d4f-043b35a7a750/workitems/System.Composition.AttributeModel.Tests/console

===========================================================================================================
~/work/A8F20901/w/8E960823/e ~/work/A8F20901/w/8E960823/e
  Discovering: System.Composition.AttributeModel.Tests (method display = ClassAndMethod, method display options = None)
  Discovered:  System.Composition.AttributeModel.Tests (found 19 test cases)
  Starting:    System.Composition.AttributeModel.Tests (parallel test collections = on, max threads = 2)
mono_threads_pthread_kill: pthread_kill failed with error 11 - potential kernel OOM or signal queue overflow

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

=================================================================
	Native stacktrace:
=================================================================
	0x7f5d815d7cbd - /home/helixbot/work/A8F20901/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7f5d8157d7b5 - /home/helixbot/work/A8F20901/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7f5d815d7355 - /home/helixbot/work/A8F20901/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7f5d82e87890 - /lib/x86_64-linux-gnu/libpthread.so.0 : 
	0x7f5d81f7fe97 - /lib/x86_64-linux-gnu/libc.so.6 : gsignal
	0x7f5d81f81801 - /lib/x86_64-linux-gnu/libc.so.6 : abort
	0x7f5d81786b35 - /home/helixbot/work/A8F20901/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7f5d8176acd0 - /home/helixbot/work/A8F20901/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7f5d81786f25 - /home/helixbot/work/A8F20901/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7f5d81786fbe - /home/helixbot/work/A8F20901/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : monoeg_g_log
	0x7f5d8177e313 - /home/helixbot/work/A8F20901/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7f5d8177ac82 - /home/helixbot/work/A8F20901/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7f5d8171b88e - /home/helixbot/work/A8F20901/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7f5d8172e92d - /home/helixbot/work/A8F20901/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7f5d8172b66f - /home/helixbot/work/A8F20901/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7f5d8172b5d3 - /home/helixbot/work/A8F20901/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7f5d81720f6e - /home/helixbot/work/A8F20901/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7f5d817213e9 - /home/helixbot/work/A8F20901/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7f5d8171d3c6 - /home/helixbot/work/A8F20901/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x414f0f87 - Unknown

=================================================================
	Telemetry Dumper:
=================================================================
Pkilling 0x140039405434624x from 0x140039413958400x
Pkilling 0x140039540684544x from 0x140039413958400x
Pkilling 0x140039411816192x from 0x140039413958400x
Pkilling 0x140039609288512x from 0x140039413958400x
Pkilling 0x140039416076032x from 0x140039413958400x
Pkilling 0x140039409698560x from 0x140039413958400x
Pkilling 0x140039407552256x from 0x140039413958400x
Entering thread summarizer pause from 0x140039413958400x
Finished thread summarizer pause from 0x140039413958400x.
Could not exec mono-hang-watchdog, expected on path '/usr/local/etc/../bin/mono-hang-watchdog' (errno 2)

Waiting for dumping threads to resume

=================================================================
	External Debugger Dump:
=================================================================
[New LWP 27863]
[New LWP 27864]
[New LWP 27865]
[New LWP 27868]
[New LWP 27869]
[New LWP 27870]
[New LWP 27871]
[New LWP 27872]
[New LWP 27873]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007f5d82e829f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x555946394848) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
88	../sysdeps/unix/sysv/linux/futex-internal.h: No such file or directory.
  Id   Target Id         Frame 
* 1    Thread 0x7f5d832a8740 (LWP 27862) "dotnet" 0x00007f5d82e829f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x555946394848) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
  2    Thread 0x7f5d80bff700 (LWP 27863) "SGen worker" 0x00007f5d82e829f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f5d81a7c798 <work_cond+40>) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
  3    Thread 0x7f5d7f13b700 (LWP 27864) "Finalizer" __lll_lock_wait () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
  4    Thread 0x7f5d77b0c700 (LWP 27865) "dotnet" 0x00007f5d82e86384 in __libc_read (fd=5, buf=0x7f5d77b0bee7, nbytes=1) at ../sysdeps/unix/sysv/linux/read.c:27
  5    Thread 0x7f5d77860700 (LWP 27868) "dotnet" 0x00007f5d82e8723a in __waitpid (pid=27875, stat_loc=0x7f5d7785d2bc, options=0) at ../sysdeps/unix/sysv/linux/waitpid.c:30
  6    Thread 0x7f5d77a65700 (LWP 27869) "dotnet" 0x00007f5d82e82ed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f5d77a64060, expected=0, futex_word=0x555946394998) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
  7    Thread 0x7f5d77655700 (LWP 27870) "dotnet" 0x00007f5d82e856d6 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x7f5d60000b80) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
  8    Thread 0x7f5d77450700 (LWP 27871) "dotnet" 0x00007f5d82e82ed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f5d7744f6a0, expected=0, futex_word=0x7f5d7744f7c8) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
  9    Thread 0x7f5d77244700 (LWP 27872) "dotnet" 0x00007f5d82e856d6 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x7f5d58000b80) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
  10   Thread 0x7f5d7703f700 (LWP 27873) "dotnet" 0x00007f5d82e856d6 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x7f5d5c000b80) at ../sysdeps/unix/sysv/linux/futex-internal.h:205

Thread 10 (Thread 0x7f5d7703f700 (LWP 27873)):
#0  0x00007f5d82e856d6 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x7f5d5c000b80) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x7f5d5c000b80, abstime=0x0) at sem_waitcommon.c:111
#2  0x00007f5d82e857c8 in __new_sem_wait_slow (sem=0x7f5d5c000b80, abstime=0x0) at sem_waitcommon.c:181
#3  0x00007f5d81779148 in mono_os_sem_wait (sem=0x7f5d5c000b80, flags=MONO_SEM_FLAGS_NONE) at /__w/1/s/src/mono/mono/utils/mono-os-semaphore.h:203
#4  mono_thread_info_wait_for_resume (info=<optimized out>) at /__w/1/s/src/mono/mono/utils/mono-threads.c:232
#5  0x00007f5d8177ec00 in mono_threads_state_poll_with_info (info=0x7f5d5c000b20) at /__w/1/s/src/mono/mono/utils/mono-threads-coop.c:149
#6  0x00007f5d8177edce in mono_threads_enter_gc_safe_region_unbalanced_with_info (info=0x7f5d5c000b20, stackdata=<optimized out>) at /__w/1/s/src/mono/mono/utils/mono-threads-coop.c:328
#7  0x00007f5d8163a5e5 in mono_coop_mutex_lock (mutex=0x5559463b8570) at /__w/1/s/src/mono/mono/utils/mono-coop-mutex.h:55
#8  mono_domain_lock (domain=0x5559463b8570) at /__w/1/s/src/mono/mono/metadata/domain.c:2038
#9  0x00007f5d816afd0f in mono_method_add_generic_virtual_invocation (domain=0x5559463b8570, vtable=0x7f5d5c03f868, vtable_slot=0x7f5d5c03f850, method=0x7f5d680cbf00, code=0x41626d10) at /__w/1/s/src/mono/mono/metadata/object.c:1827
#10 0x00007f5d815801aa in common_call_trampoline (regs=<optimized out>, code=<optimized out>, m=0x7f5d580097e0, vt=<optimized out>, vtable_slot=0x7f5d5c03f850, error=<optimized out>) at /__w/1/s/src/mono/mono/mini/mini-trampolines.c:655
#11 0x00007f5d81580e39 in mono_vcall_trampoline (regs=0x7f5d7703d998, code=0x414f4ddc "H\211E\320\351S", slot=-3, tramp=<optimized out>) at /__w/1/s/src/mono/mono/mini/mini-trampolines.c:856
#12 0x00000000413b9293 in ?? ()
#13 0x00007f5d5c002585 in ?? ()
#14 0x00007f5d80f9bb88 in ?? ()
#15 0x00007f5d7703db60 in ?? ()
#16 0x00007f5d7703d998 in ?? ()
#17 0x00007f5d5c001d20 in ?? ()
#18 0x00007f5d5c03f868 in ?? ()
#19 0x00007f5d80ed4498 in ?? ()
#20 0x00007f5d80006f77 in ?? ()
#21 0x00007f5d80f7a838 in ?? ()
#22 0x00007f5d7703db60 in ?? ()
#23 0x00007f5d7703dbc0 in ?? ()
#24 0x0000000000000002 in ?? ()
#25 0x00007f5d80febb48 in ?? ()
#26 0x00000000000007b4 in ?? ()
#27 0x0000000000000001 in ?? ()
#28 0x00007f5d680cbf00 in ?? ()
#29 0x00007f5d8164723f in mono_class_is_assignable_from_internal (klass=<optimized out>, oklass=<optimized out>) at /__w/1/s/src/mono/mono/metadata/class.c:3631
#30 0x0000000000000000 in ?? ()

Thread 9 (Thread 0x7f5d77244700 (LWP 27872)):
#0  0x00007f5d82e856d6 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x7f5d58000b80) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x7f5d58000b80, abstime=0x0) at sem_waitcommon.c:111
#2  0x00007f5d82e857c8 in __new_sem_wait_slow (sem=0x7f5d58000b80, abstime=0x0) at sem_waitcommon.c:181
#3  0x00007f5d81779148 in mono_os_sem_wait (sem=0x7f5d58000b80, flags=MONO_SEM_FLAGS_NONE) at /__w/1/s/src/mono/mono/utils/mono-os-semaphore.h:203
#4  mono_thread_info_wait_for_resume (info=<optimized out>) at /__w/1/s/src/mono/mono/utils/mono-threads.c:232
#5  0x00007f5d8177eefe in mono_threads_exit_gc_safe_region_unbalanced_internal (cookie=0x7f5d58000b20, stackdata=<optimized out>) at /__w/1/s/src/mono/mono/utils/mono-threads-coop.c:391
#6  0x00007f5d8163a5ff in mono_coop_mutex_lock (mutex=0x5559463b8570) at /__w/1/s/src/mono/mono/utils/mono-coop-mutex.h:59
#7  mono_domain_lock (domain=0x5559463b8570) at /__w/1/s/src/mono/mono/metadata/domain.c:2038
#8  0x00007f5d8163a7dd in mono_domain_code_reserve (domain=0x5559463b8570, size=1792) at /__w/1/s/src/mono/mono/metadata/domain.c:1434
#9  0x00007f5d814e610d in mono_codegen (cfg=0x7f5d5819ee20) at /__w/1/s/src/mono/mono/mini/mini.c:2244
#10 0x00007f5d814e84e7 in mini_method_compile (method=<optimized out>, opts=<optimized out>, domain=<optimized out>, flags=<optimized out>, parts=<optimized out>, aot_method_index=<optimized out>) at /__w/1/s/src/mono/mono/mini/mini.c:3866
#11 0x00007f5d814e96eb in mono_jit_compile_method_inner (method=0x7f5d58083a90, target_domain=0x5559463b8570, opt=393, error=0x7f5d7723fca8) at /__w/1/s/src/mono/mono/mini/mini.c:4060
#12 0x00007f5d814ed046 in mono_jit_compile_method_with_opt (method=0x7f5d58083a90, opt=<optimized out>, jit_only=0, error=0x7f5d7723fca8) at /__w/1/s/src/mono/mono/mini/mini-runtime.c:2448
#13 0x00007f5d815800fa in common_call_trampoline (regs=<optimized out>, code=<optimized out>, m=0x7f5d58083a90, vt=<optimized out>, vtable_slot=<optimized out>, error=<optimized out>) at /__w/1/s/src/mono/mono/mini/mini-trampolines.c:635
#14 0x00007f5d81580e39 in mono_vcall_trampoline (regs=0x7f5d7723fd58, code=0x41656d4c "L\213\360H\205\300\017\205)", slot=8, tramp=<optimized out>) at /__w/1/s/src/mono/mono/mini/mini-trampolines.c:856
#15 0x00000000413b9293 in ?? ()
#16 0x00007f5d77240a1d in ?? ()
#17 0x00007f5d80006e85 in ?? ()
#18 0x00007f5d7723ff20 in ?? ()
#19 0x00007f5d7723fd58 in ?? ()
#20 0x00007f5d58001d20 in ?? ()
#21 0x00007f5d5c0deca0 in ?? ()
#22 0x0000000000000001 in ?? ()
#23 0x0000000000000001 in ?? ()
#24 0x00007f5d80c01b40 in ?? ()
#25 0x00007f5d7723ff20 in ?? ()
#26 0x00007f5d7723fff0 in ?? ()
#27 0x00007f5d80c84d20 in ?? ()
#28 0x00007f5d80fd0790 in ?? ()
#29 0x0000000000000000 in ?? ()

Thread 8 (Thread 0x7f5d77450700 (LWP 27871)):
#0  0x00007f5d82e82ed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f5d7744f6a0, expected=0, futex_word=0x7f5d7744f7c8) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  __pthread_cond_wait_common (abstime=0x7f5d7744f758, mutex=0x7f5d680209c0, cond=0x7f5d7744f7a0) at pthread_cond_wait.c:533
#2  __pthread_cond_timedwait (cond=0x7f5d7744f7a0, mutex=0x7f5d680209c0, abstime=0x7f5d7744f758) at pthread_cond_wait.c:667
#3  0x00007f5d81770d64 in mono_os_cond_timedwait (cond=0x7f5d7744f7a0, mutex=0x7f5d680209c0, timeout_ms=20000) at /__w/1/s/src/mono/mono/utils/mono-os-mutex.c:75
#4  0x00007f5d817772b4 in mono_coop_cond_timedwait (cond=0x7f5d7744f7a0, mutex=<optimized out>, timeout_ms=20000) at /__w/1/s/src/mono/mono/utils/mono-coop-mutex.h:103
#5  mono_lifo_semaphore_timed_wait (semaphore=0x7f5d680209c0, timeout_ms=20000) at /__w/1/s/src/mono/mono/utils/lifo-semaphore.c:48
#6  0x00000000415f9e16 in ?? ()
#7  0x00007f5d80f86518 in ?? ()
#8  0x0000000000000046 in ?? ()
#9  0x0000000000000002 in ?? ()
#10 0x00007f5d80f82d58 in ?? ()
#11 0x0000000000004e20 in ?? ()
#12 0x00007f5d64002580 in ?? ()
#13 0x00007f5d7744fbe0 in ?? ()
#14 0x00007f5d7744f820 in ?? ()
#15 0x00007f5d7744fbe0 in ?? ()
#16 0x00000000415f9d78 in ?? ()
#17 0x00007f5d80f82d58 in ?? ()
#18 0x0000000000004e20 in ?? ()
#19 0x00007f5d7744fbe0 in ?? ()
#20 0x00000000415f9a1c in ?? ()
#21 0x00007f5d80f82d58 in ?? ()
#22 0x0000000000004e20 in ?? ()
#23 0x00007f5d64000b20 in ?? ()
#24 0x0000000000000002 in ?? ()
#25 0x00007f5d80f86518 in ?? ()
#26 0x0000000000000044 in ?? ()
#27 0x0000000000000000 in ?? ()

Thread 7 (Thread 0x7f5d77655700 (LWP 27870)):
#0  0x00007f5d82e856d6 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x7f5d60000b80) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x7f5d60000b80, abstime=0x0) at sem_waitcommon.c:111
#2  0x00007f5d82e857c8 in __new_sem_wait_slow (sem=0x7f5d60000b80, abstime=0x0) at sem_waitcommon.c:181
#3  0x00007f5d81779148 in mono_os_sem_wait (sem=0x7f5d60000b80, flags=MONO_SEM_FLAGS_NONE) at /__w/1/s/src/mono/mono/utils/mono-os-semaphore.h:203
#4  mono_thread_info_wait_for_resume (info=<optimized out>) at /__w/1/s/src/mono/mono/utils/mono-threads.c:232
#5  0x00007f5d8177eefe in mono_threads_exit_gc_safe_region_unbalanced_internal (cookie=0x7f5d60000b20, stackdata=<optimized out>) at /__w/1/s/src/mono/mono/utils/mono-threads-coop.c:391
#6  0x00007f5d8177bb3d in mono_coop_cond_timedwait (cond=<optimized out>, mutex=<optimized out>, timeout_ms=500) at /__w/1/s/src/mono/mono/utils/mono-coop-mutex.h:105
#7  sleep_interruptable (ms=500, alerted=<optimized out>) at /__w/1/s/src/mono/mono/utils/mono-threads.c:1640
#8  mono_thread_info_sleep (ms=500, alerted=<optimized out>) at /__w/1/s/src/mono/mono/utils/mono-threads.c:1672
#9  0x00007f5d816c172e in mono_sleep_internal (ms=<optimized out>, error=<optimized out>, allow_interruption=<optimized out>) at /__w/1/s/src/mono/mono/metadata/threads.c:1806
#10 ves_icall_System_Threading_Thread_Sleep_internal (ms=500, allow_interruption=1 '\001', error=<optimized out>) at /__w/1/s/src/mono/mono/metadata/threads.c:1839
#11 0x00007f5d81673cf8 in ves_icall_System_Threading_Thread_Sleep_internal_raw (a0=500, a1=1 '\001') at /__w/1/s/src/mono/mono/metadata/icall-def-netcore.h:510
#12 0x00000000415f0746 in ?? ()
#13 0x00007f5d80f83030 in ?? ()
#14 0x00007f5d77654e68 in ?? ()
#15 0x0000555946cd8928 in ?? ()
#16 0x00007f5d80f83030 in ?? ()
#17 0x00000000000001f4 in ?? ()
#18 0x00007f5d60002580 in ?? ()
#19 0x00007f5d77654be0 in ?? ()
#20 0x00007f5d77654ae0 in ?? ()
#21 0x00007f5d77654be0 in ?? ()
#22 0x00000000415f0628 in ?? ()
#23 0x00007f5d80f830b0 in ?? ()
#24 0x00005559463f8468 in ?? ()
#25 0x00007f5d77654be0 in ?? ()
#26 0x00000000415f05f0 in ?? ()
#27 0x00007f5d77654be0 in ?? ()
#28 0x00000000415ef774 in ?? ()
#29 0x0000000000000000 in ?? ()

Thread 6 (Thread 0x7f5d77a65700 (LWP 27869)):
#0  0x00007f5d82e82ed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f5d77a64060, expected=0, futex_word=0x555946394998) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  __pthread_cond_wait_common (abstime=0x7f5d77a64118, mutex=0x555946394948, cond=0x555946394970) at pthread_cond_wait.c:533
#2  __pthread_cond_timedwait (cond=0x555946394970, mutex=0x555946394948, abstime=0x7f5d77a64118) at pthread_cond_wait.c:667
#3  0x00007f5d81770d64 in mono_os_cond_timedwait (cond=0x555946394970, mutex=0x555946394948, timeout_ms=12000) at /__w/1/s/src/mono/mono/utils/mono-os-mutex.c:75
#4  0x00007f5d816dfd04 in mono_coop_cond_timedwait (cond=<optimized out>, mutex=<optimized out>, timeout_ms=12000) at /__w/1/s/src/mono/mono/utils/mono-coop-mutex.h:103
#5  mono_w32handle_timedwait_signal_naked (cond=<optimized out>, mutex=<optimized out>, timeout=12000, poll=0, alerted=0x7f5d77a641bc) at /__w/1/s/src/mono/mono/metadata/w32handle.c:652
#6  mono_w32handle_timedwait_signal_handle (handle_data=<optimized out>, timeout=12000, poll=0, alerted=0x7f5d77a641bc) at /__w/1/s/src/mono/mono/metadata/w32handle.c:767
#7  0x00007f5d816dfbc7 in mono_w32handle_wait_one (handle=<optimized out>, timeout=12000, alertable=<optimized out>) at /__w/1/s/src/mono/mono/metadata/w32handle.c:882
#8  0x00007f5d816dfe24 in mono_w32handle_wait_multiple (handles=0x7f5d77a648e0, nhandles=1, waitall=<optimized out>, timeout=12000, alertable=1, error=0x2) at /__w/1/s/src/mono/mono/metadata/w32handle.c:1002
#9  0x00007f5d816c269f in ves_icall_System_Threading_WaitHandle_Wait_internal (handles=0x7f5d77a648e0, numhandles=1, waitall=0 '\000', timeout=12000, error=0x7f5d77a64808) at /__w/1/s/src/mono/mono/metadata/threads.c:2314
#10 0x00007f5d81673ebc in ves_icall_System_Threading_WaitHandle_Wait_internal_raw (a0=0x7f5d77a648e0, a1=1, a2=0 '\000', a3=12000) at /__w/1/s/src/mono/mono/metadata/icall-def-netcore.h:516
#11 0x00000000415a4bd2 in ?? ()
#12 0x00007f5d80f82e08 in ?? ()
#13 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7f5d77860700 (LWP 27868)):
#0  0x00007f5d82e8723a in __waitpid (pid=27875, stat_loc=0x7f5d7785d2bc, options=0) at ../sysdeps/unix/sysv/linux/waitpid.c:30
#1  0x00007f5d815d7f01 in dump_native_stacktrace (signal=<optimized out>, mctx=<optimized out>) at /__w/1/s/src/mono/mono/mini/mini-posix.c:1113
#2  mono_dump_native_crash_info (signal=<optimized out>, mctx=0x7f5d7785ddd0, info=<optimized out>) at /__w/1/s/src/mono/mono/mini/mini-posix.c:1157
#3  0x00007f5d8157d7b5 in mono_handle_native_crash (signal=0x7f5d817f5b83 "SIGABRT", mctx=0x7f5d7785ddd0, info=0x7f5d7785e0b0) at /__w/1/s/src/mono/mono/mini/mini-exceptions.c:3427
#4  0x00007f5d815d7355 in sigabrt_signal_handler (_dummy=6, _info=0x7f5d7785e0b0, context=0x7f5d7785df80) at /__w/1/s/src/mono/mono/mini/mini-posix.c:234
#5  <signal handler called>
#6  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#7  0x00007f5d81f81801 in __GI_abort () at abort.c:79
#8  0x00007f5d81786b35 in monoeg_assert_abort () at /__w/1/s/src/mono/mono/eglib/goutput.c:57
#9  0x00007f5d8176acd0 in mono_log_write_logfile (log_domain=<optimized out>, level=<optimized out>, hdr=<optimized out>, message=0x7f5d68036990 "mono_threads_pthread_kill: pthread_kill failed with error 11 - potential kernel OOM or signal queue overflow") at /__w/1/s/src/mono/mono/utils/mono-log-common.c:136
#10 0x00007f5d81786f25 in monoeg_g_logstr (log_domain=0x0, log_level=G_LOG_LEVEL_ERROR, msg=0x0) at /__w/1/s/src/mono/mono/eglib/goutput.c:151
#11 monoeg_g_logv_nofree (log_domain=0x0, log_level=G_LOG_LEVEL_ERROR, format=<optimized out>, args=<optimized out>) at /__w/1/s/src/mono/mono/eglib/goutput.c:166
#12 0x00007f5d81786fbe in monoeg_g_logv (log_domain=0x2 <error: Cannot access memory at address 0x2>, log_level=2005265504, format=0x0, args=0x7f5d7785f3a0) at /__w/1/s/src/mono/mono/eglib/goutput.c:173
#13 monoeg_g_log (log_domain=0x2 <error: Cannot access memory at address 0x2>, log_level=2005265504, format=0x0) at /__w/1/s/src/mono/mono/eglib/goutput.c:182
#14 0x00007f5d8177e313 in mono_threads_pthread_kill (info=0x7f5d64000b20, signum=<optimized out>) at /__w/1/s/src/mono/mono/utils/mono-threads-posix.c:209
#15 mono_threads_suspend_begin_async_suspend (info=0x7f5d64000b20, interrupt_kernel=<optimized out>) at /__w/1/s/src/mono/mono/utils/mono-threads-posix.c:358
#16 0x00007f5d8177ac82 in mono_thread_info_begin_suspend (info=0x7f5d64000b20, phase=<optimized out>) at /__w/1/s/src/mono/mono/utils/atomic.h:261
#17 0x00007f5d8171b88e in sgen_unified_suspend_stop_world () at /__w/1/s/src/mono/mono/metadata/sgen-stw.c:288
#18 sgen_client_stop_world (generation=0, serial_collection=0) at /__w/1/s/src/mono/mono/metadata/sgen-stw.c:124
#19 0x00007f5d8172e92d in sgen_stop_world (generation=0, serial_collection=0) at /__w/1/s/src/mono/mono/sgen/sgen-gc.c:3869
#20 0x00007f5d8172b66f in sgen_perform_collection_inner (requested_size=<optimized out>, generation_to_collect=<optimized out>, reason=<optimized out>, forced_serial=<optimized out>, stw=<optimized out>) at /__w/1/s/src/mono/mono/sgen/sgen-gc.c:2566
#21 sgen_perform_collection (requested_size=4096, generation_to_collect=0, reason=0x7f5d817eda16 "Nursery full", forced_serial=0, stw=1) at /__w/1/s/src/mono/mono/sgen/sgen-gc.c:2679
#22 0x00007f5d8172b5d3 in sgen_ensure_free_space (size=4096, generation=<optimized out>) at /__w/1/s/src/mono/mono/sgen/sgen-gc.c:2545
#23 0x00007f5d81720f6e in sgen_alloc_obj_nolock (vtable=0x555946ae0c70, size=128) at /__w/1/s/src/mono/mono/sgen/sgen-alloc.c:279
#24 0x00007f5d817213e9 in sgen_alloc_obj (vtable=0x555946ae0c70, size=128) at /__w/1/s/src/mono/mono/sgen/sgen-alloc.c:454
#25 0x00007f5d8171d3c6 in mono_gc_alloc_obj (vtable=0x2, size=140039413951584) at /__w/1/s/src/mono/mono/metadata/sgen-mono.c:921
#26 0x00000000414f0f87 in ?? ()
#27 0x00007f5d80ffffc0 in ?? ()
#28 0x00007f5d68018d50 in ?? ()
#29 0x00007f5d680186e0 in ?? ()
#30 0x0000555946ae0c70 in ?? ()
#31 0x0000000000000080 in ?? ()
#32 0x00007f5d6803d800 in ?? ()
#33 0x00007f5d81000040 in ?? ()
#34 0x00007f5d7785f730 in ?? ()
#35 0x00007f5d80fd2308 in ?? ()
#36 0x00000000414c4d24 in ?? ()
#37 0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7f5d77b0c700 (LWP 27865)):
#0  0x00007f5d82e86384 in __libc_read (fd=5, buf=0x7f5d77b0bee7, nbytes=1) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007f5d7eb5fd5e in SignalHandlerLoop (arg=0x555946ac6e20) at /__w/1/s/src/libraries/Native/Unix/System.Native/pal_signal.c:90
#2  0x00007f5d82e7c6db in start_thread (arg=0x7f5d77b0c700) at pthread_create.c:463
#3  0x00007f5d8206288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f5d7f13b700 (LWP 27864)):
#0  __lll_lock_wait () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
#1  0x00007f5d82e7f023 in __GI___pthread_mutex_lock (mutex=0x7f5d81a82490 <sgen_gc_mutex>) at ../nptl/pthread_mutex_lock.c:78
#2  0x00007f5d8172bfb9 in mono_os_mutex_lock (mutex=<optimized out>) at /__w/1/s/src/mono/mono/utils/mono-os-mutex.h:105
#3  mono_coop_mutex_lock (mutex=<optimized out>) at /__w/1/s/src/mono/mono/utils/mono-coop-mutex.h:57
#4  sgen_gc_lock () at /__w/1/s/src/mono/mono/sgen/sgen-gc.c:3811
#5  0x00007f5d8171f5a8 in mono_gc_skip_thread_changing (skip=0) at /__w/1/s/src/mono/mono/metadata/sgen-mono.c:2201
#6  0x00007f5d8177a308 in mono_thread_info_set_flags (flags=MONO_THREAD_INFO_FLAGS_NONE) at /__w/1/s/src/mono/mono/utils/mono-threads.c:814
#7  0x00007f5d8170de0e in finalizer_thread (unused=<optimized out>) at /__w/1/s/src/mono/mono/metadata/gc.c:969
#8  0x00007f5d816c7b0a in start_wrapper_internal (start_info=0x0, stack_ptr=<optimized out>) at /__w/1/s/src/mono/mono/metadata/threads.c:1233
#9  0x00007f5d816c7989 in start_wrapper (data=0x555946406350) at /__w/1/s/src/mono/mono/metadata/threads.c:1308
#10 0x00007f5d82e7c6db in start_thread (arg=0x7f5d7f13b700) at pthread_create.c:463
#11 0x00007f5d8206288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f5d80bff700 (LWP 27863)):
#0  0x00007f5d82e829f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f5d81a7c798 <work_cond+40>) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x7f5d81a7c748 <lock>, cond=0x7f5d81a7c770 <work_cond>) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x7f5d81a7c770 <work_cond>, mutex=0x7f5d81a7c748 <lock>) at pthread_cond_wait.c:655
#3  0x00007f5d8175fa53 in mono_os_cond_wait (cond=<optimized out>, mutex=<optimized out>) at /__w/1/s/src/mono/mono/utils/mono-os-mutex.h:219
#4  get_work (worker_index=<optimized out>, work_context=<optimized out>, do_idle=<optimized out>, job=<optimized out>) at /__w/1/s/src/mono/mono/sgen/sgen-thread-pool.c:165
#5  thread_func (data=0x0) at /__w/1/s/src/mono/mono/sgen/sgen-thread-pool.c:196
#6  0x00007f5d82e7c6db in start_thread (arg=0x7f5d80bff700) at pthread_create.c:463
#7  0x00007f5d8206288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f5d832a8740 (LWP 27862)):
#0  0x00007f5d82e829f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x555946394848) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x5559463947f8, cond=0x555946394820) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x555946394820, mutex=0x5559463947f8) at pthread_cond_wait.c:655
#3  0x00007f5d81770d80 in mono_os_cond_wait (cond=0x555946394820, mutex=0x5559463947f8) at /__w/1/s/src/mono/mono/utils/mono-os-mutex.h:219
#4  mono_os_cond_timedwait (cond=0x555946394820, mutex=0x5559463947f8, timeout_ms=0) at /__w/1/s/src/mono/mono/utils/mono-os-mutex.c:32
#5  0x00007f5d816dfd04 in mono_coop_cond_timedwait (cond=<optimized out>, mutex=<optimized out>, timeout_ms=4294967295) at /__w/1/s/src/mono/mono/utils/mono-coop-mutex.h:103
#6  mono_w32handle_timedwait_signal_naked (cond=<optimized out>, mutex=<optimized out>, timeout=4294967295, poll=0, alerted=0x7ffeb6cbe9bc) at /__w/1/s/src/mono/mono/metadata/w32handle.c:652
#7  mono_w32handle_timedwait_signal_handle (handle_data=<optimized out>, timeout=4294967295, poll=0, alerted=0x7ffeb6cbe9bc) at /__w/1/s/src/mono/mono/metadata/w32handle.c:767
#8  0x00007f5d816dfbc7 in mono_w32handle_wait_one (handle=<optimized out>, timeout=4294967295, alertable=<optimized out>) at /__w/1/s/src/mono/mono/metadata/w32handle.c:882
#9  0x00007f5d816dfe24 in mono_w32handle_wait_multiple (handles=0x7ffeb6cbf0e0, nhandles=1, waitall=<optimized out>, timeout=4294967295, alertable=1, error=0x0) at /__w/1/s/src/mono/mono/metadata/w32handle.c:1002
#10 0x00007f5d816c269f in ves_icall_System_Threading_WaitHandle_Wait_internal (handles=0x7ffeb6cbf0e0, numhandles=1, waitall=0 '\000', timeout=-1, error=0x7ffeb6cbf008) at /__w/1/s/src/mono/mono/metadata/threads.c:2314
#11 0x00007f5d81673ebc in ves_icall_System_Threading_WaitHandle_Wait_internal_raw (a0=0x7ffeb6cbf0e0, a1=1, a2=0 '\000', a3=-1) at /__w/1/s/src/mono/mono/metadata/icall-def-netcore.h:516
#12 0x00000000415a4bd2 in ?? ()
#13 0x00007f5d80ee7b10 in ?? ()
#14 0x0000000000000000 in ?? ()

=================================================================
	Basic Fault Address Reporting
=================================================================
Memory around native instruction pointer (0x7f5d81f7fe97):0x7f5d81f7fe87  d2 4c 89 ce bf 02 00 00 00 b8 0e 00 00 00 0f 05  .L..............
0x7f5d81f7fe97  48 8b 8c 24 08 01 00 00 64 48 33 0c 25 28 00 00  H..$....dH3.%(..
0x7f5d81f7fea7  00 44 89 c0 75 1f 48 81 c4 18 01 00 00 c3 0f 1f  .D..u.H.........
0x7f5d81f7feb7  00 48 8b 15 a9 bf 3a 00 f7 d8 41 b8 ff ff ff ff  .H....:...A.....

=================================================================
	Managed Stacktrace:
=================================================================
	  at <unknown> <0xffffffff>
	  at System.Object:__icall_wrapper_mono_gc_alloc_obj <0x00076>
	  at System.Object:AllocSmall <0x00103>
	  at Xunit.DelegatingExecutionSummarySink:OnMessageWithTypes <0x0032b>
	  at Xunit.DelegatingXmlCreationSink:OnMessageWithTypes <0x00054>
	  at Xunit.DelegatingLongRunningTestDetectionSink:OnMessageWithTypes <0x00071>
	  at Xunit.MessageSinkAdapter:OnMessageWithTypes <0x0004c>
	  at Xunit.OptimizedRemoteMessageSink:OnMessage <0x0005d>
	  at Xunit.Sdk.MessageBus:DispatchMessages <0x00094>
	  at Xunit.Sdk.MessageBus:ReporterWorker <0x0005f>
	  at <>c:<QueueUserWorkItem>b__5_0 <0x0006b>
	  at System.Threading.Tasks.Task:InnerInvoke <0x000a2>
	  at <>c:<.cctor>b__274_0 <0x0002f>
	  at System.Threading.ExecutionContext:RunInternal <0x00101>
	  at System.Threading.Tasks.Task:ExecuteWithThreadLocal <0x00283>
	  at System.Threading.Tasks.Task:ExecuteEntryUnsafe <0x00097>
	  at <>c:<.cctor>b__10_0 <0x0005b>
	  at System.Threading.Thread:StartCallback <0x00109>
	  at System.Object:runtime_invoke_void__this__ <0x00091>
=================================================================
./RunTests.sh: line 161: 27862 Aborted                 "$RUNTIME_PATH/dotnet" exec --runtimeconfig System.Composition.AttributeModel.Tests.runtimeconfig.json --depsfile System.Composition.AttributeModel.Tests.deps.json xunit.console.dll System.Composition.AttributeModel.Tests.dll -xml testResults.xml -nologo -nocolor -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing -notrait category=nonnetcoreapptests -notrait category=nonlinuxtests $RSP_FILE
~/work/A8F20901/w/8E960823/e
----- end Sat Feb 15 08:36:14 UTC 2020 ----- exit code 134 ----------------------------------------------------------
exit code 134 means SIGABRT Abort. Managed or native assert, or runtime check such as heap corruption, caused call to abort(). Core dumped.
Looking around for any Linux dump...
... found no dump in /home/helixbot/work/A8F20901/w/8E960823/e