SystemNative_GetCpuUtilization assert failing under load

[stephentoub]

So far I've only seen it on Mono.
See #2153 (comment)

dotnet: /__w/2/s/src/libraries/Native/Unix/System.Native/pal_time.c:165: int32_t SystemNative_GetCpuUtilization(ProcessCpuInformation *): Assertion `cpuUtilization >= 0 && cpuUtilization <= 100' failed.

runtime/src/libraries/Native/Unix/System.Native/pal_time.c

Line 165 in 4f9ae42

assert(cpuUtilization >= 0 && cpuUtilization <= 100);

cc: @akoeplinger

[akoeplinger]

Here's a full crash trace:

dotnet: /__w/1/s/src/libraries/Native/Unix/System.Native/pal_time.c:165: int32_t SystemNative_GetCpuUtilization(ProcessCpuInformation *): Assertion `cpuUtilization >= 0 && cpuUtilization <= 100' failed.

=================================================================
	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:
=================================================================
	0x7ff108855aad - /home/helixbot/work/A1D508FA/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7ff1087fbdf5 - /home/helixbot/work/A1D508FA/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7ff108855141 - /home/helixbot/work/A1D508FA/p/shared/Microsoft.NETCore.App/5.0.0/libcoreclr.so : 
	0x7ff109fe70e0 - /lib/x86_64-linux-gnu/libpthread.so.0 : 
	0x7ff1091c8fff - /lib/x86_64-linux-gnu/libc.so.6 : gsignal
	0x7ff1091ca42a - /lib/x86_64-linux-gnu/libc.so.6 : abort
	0x7ff1091c1e67 - /lib/x86_64-linux-gnu/libc.so.6 : 
	0x7ff1091c1f12 - /lib/x86_64-linux-gnu/libc.so.6 : 
	0x7ff105f6e903 - /home/helixbot/work/A1D508FA/p/shared/Microsoft.NETCore.App/5.0.0/System.Native.so : SystemNative_GetCpuUtilization
	0x41e378bc - Unknown

=================================================================
	Telemetry Dumper:
=================================================================
Pkilling 0x140673036068608x from 0x140673133786880x
Pkilling 0x140673031866112x from 0x140673133786880x
Pkilling 0x140673169860352x from 0x140673133786880x
Pkilling 0x140673140889344x from 0x140673133786880x
Pkilling 0x140673138771712x from 0x140673133786880x
Pkilling 0x140673235838784x from 0x140673133786880x
Pkilling 0x140673033967360x from 0x140673133786880x
Could not exec mono-hang-watchdog, expected on path '/usr/local/etc/../bin/mono-hang-watchdog' (errno 2)
Entering thread summarizer pause from 0x140673133786880x
Finished thread summarizer pause from 0x140673133786880x.

Waiting for dumping threads to resume

=================================================================
	External Debugger Dump:
=================================================================
[New LWP 2870]
[New LWP 2871]
[New LWP 2872]
[New LWP 2875]
[New LWP 2876]
[New LWP 2877]
[New LWP 2878]
[New LWP 2879]
[New LWP 2880]
[New LWP 2889]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007ff1091c93d6 in __GI___sigsuspend (set=0x7ff108cfc1d8 <suspend_signal_mask>) at ../sysdeps/unix/sysv/linux/sigsuspend.c:30
30	../sysdeps/unix/sysv/linux/sigsuspend.c: No such file or directory.
  Id   Target Id         Frame 
* 1    Thread 0x7ff10a406740 (LWP 2869) "dotnet" 0x00007ff1091c93d6 in __GI___sigsuspend (set=0x7ff108cfc1d8 <suspend_signal_mask>) at ../sysdeps/unix/sysv/linux/sigsuspend.c:30
  2    Thread 0x7ff107fff700 (LWP 2870) "SGen worker" pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
  3    Thread 0x7ff10651a700 (LWP 2871) "Finalizer" 0x00007ff109fe5556 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x7ff108ced068 <finalizer_sem>) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
  4    Thread 0x7ff104a9b700 (LWP 2872) "dotnet" 0x00007ff109fe622d in read () at ../sysdeps/unix/syscall-template.S:84
  5    Thread 0x7ff104979700 (LWP 2875) "dotnet" 0x00007ff109fe5556 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x7ff108cfc060 <suspend_semaphore>) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
  6    Thread 0x7ff104774700 (LWP 2876) "dotnet" 0x00007ff1091c93d6 in __GI___sigsuspend (set=0x7ff108cfc1d8 <suspend_signal_mask>) at ../sysdeps/unix/sysv/linux/sigsuspend.c:30
  7    Thread 0x7ff1042b3700 (LWP 2877) "dotnet" 0x00007ff1091c93d6 in __GI___sigsuspend (set=0x7ff108cfc1d8 <suspend_signal_mask>) at ../sysdeps/unix/sysv/linux/sigsuspend.c:30
  8    Thread 0x7ff0fe582700 (LWP 2878) "dotnet" 0x00007ff1091c93d6 in __GI___sigsuspend (set=0x7ff108cfc1d8 <suspend_signal_mask>) at ../sysdeps/unix/sysv/linux/sigsuspend.c:30
  9    Thread 0x7ff0fe381700 (LWP 2879) "dotnet" 0x00007ff1092730e7 in unlink () at ../sysdeps/unix/syscall-template.S:84
  10   Thread 0x7ff0fe180700 (LWP 2880) "dotnet" 0x00007ff109fe5556 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x7ff0e0000920) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
  11   Thread 0x7ff0e77ff700 (LWP 2889) "dotnet" 0x00007ff1091c93d6 in __GI___sigsuspend (set=0x7ff108cfc1d8 <suspend_signal_mask>) at ../sysdeps/unix/sysv/linux/sigsuspend.c:30

Thread 11 (Thread 0x7ff0e77ff700 (LWP 2889)):
#0  0x00007ff1091c93d6 in __GI___sigsuspend (set=0x7ff108cfc1d8 <suspend_signal_mask>) at ../sysdeps/unix/sysv/linux/sigsuspend.c:30
#1  0x00007ff1089fb592 in suspend_signal_handler (_dummy=<optimized out>, info=<optimized out>, context=0x7ff0e77fdc80) at /__w/1/s/src/mono/mono/utils/mono-threads-posix-signals.c:200
#2  <signal handler called>
#3  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#4  0x00007ff1089ee144 in mono_os_cond_timedwait (cond=0x8243b0, mutex=0x824388, timeout_ms=240000) at /__w/1/s/src/mono/mono/utils/mono-os-mutex.c:75
#5  0x00007ff10895db34 in mono_coop_cond_timedwait (cond=<optimized out>, mutex=<optimized out>, timeout_ms=240000) 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=240000, poll=0, alerted=0x7ff0e77fe31c) at /__w/1/s/src/mono/mono/metadata/w32handle.c:652
#7  mono_w32handle_timedwait_signal_handle (handle_data=<optimized out>, timeout=240000, poll=0, alerted=0x7ff0e77fe31c) at /__w/1/s/src/mono/mono/metadata/w32handle.c:767
#8  0x00007ff10895d9f7 in mono_w32handle_wait_one (handle=<optimized out>, timeout=240000, alertable=<optimized out>) at /__w/1/s/src/mono/mono/metadata/w32handle.c:882
#9  0x00007ff10895dc54 in mono_w32handle_wait_multiple (handles=0x7ff0e77fea40, nhandles=1, waitall=<optimized out>, timeout=240000, alertable=1, error=0xffffffff) at /__w/1/s/src/mono/mono/metadata/w32handle.c:1002
#10 0x00007ff108940486 in ves_icall_System_Threading_WaitHandle_Wait_internal (handles=0x7ff0e77fea40, numhandles=1, waitall=<optimized out>, timeout=240000, error=0x7ff0e77fe970) at /__w/1/s/src/mono/mono/metadata/threads.c:2313
#11 0x00007ff1088f1900 in ves_icall_System_Threading_WaitHandle_Wait_internal_raw (a0=0x7ff0e77fea40, a1=1, a2=0 '\000', a3=240000) at /__w/1/s/src/mono/mono/metadata/icall-def-netcore.h:510
#12 0x0000000041de2ee2 in ?? ()
#13 0x00007ff108343930 in ?? ()
#14 0x0000000000000000 in ?? ()

Thread 10 (Thread 0x7ff0fe180700 (LWP 2880)):
#0  0x00007ff109fe5556 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x7ff0e0000920) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x7ff0e0000920, abstime=0x0) at sem_waitcommon.c:111
#2  0x00007ff109fe5604 in __new_sem_wait_slow (sem=0x7ff0e0000920, abstime=0x0) at sem_waitcommon.c:181
#3  0x00007ff1089f5e48 in mono_os_sem_wait (sem=0x7ff0e0000920, 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  0x00007ff1089fb900 in mono_threads_state_poll_with_info (info=0x7ff0e00008c0) at /__w/1/s/src/mono/mono/utils/mono-threads-coop.c:149
#6  0x00007ff108767562 in mono_threads_safepoint () at /__w/1/s/src/mono/mono/utils/mono-threads-coop.h:117
#7  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:3594
#8  0x00007ff10876845d in mono_jit_compile_method_inner (method=0x7ff0f81049e0, target_domain=0x840720, opt=393, error=0x7ff0fe17c908) at /__w/1/s/src/mono/mono/mini/mini.c:4060
#9  0x00007ff10876bd86 in mono_jit_compile_method_with_opt (method=0x7ff0f81049e0, opt=<optimized out>, jit_only=1, error=0x7ff0fe17c908) at /__w/1/s/src/mono/mono/mini/mini-runtime.c:2447
#10 0x00007ff10876fd00 in mono_jit_compile_method_jit_only (method=<optimized out>, error=0x7ff0fe17c908) at /__w/1/s/src/mono/mono/mini/mini-runtime.c:2511
#11 mono_jit_runtime_invoke (method=0x7ff0f81049e0, obj=<optimized out>, params=<optimized out>, exc=0x0, error=0x7ff0fe17c908) at /__w/1/s/src/mono/mono/mini/mini-runtime.c:3053
#12 0x00007ff10892aaa8 in do_runtime_invoke (method=0x7ff0f81049e0, obj=0x7ff1082aadf8, params=0x7ff0fe17c7f0, exc=0x0, error=0x7ff0fe17c908) at /__w/1/s/src/mono/mono/metadata/object.c:3052
#13 mono_runtime_invoke_checked (method=0x7ff0f81049e0, obj=0x7ff1082aadf8, params=0x7ff0fe17c7f0, error=0x7ff0fe17c908) at /__w/1/s/src/mono/mono/metadata/object.c:3220
#14 0x00007ff108932182 in mono_runtime_try_invoke_array (method=<optimized out>, obj=0x7ff1082aadf8, params=0x7ff10452ddd0, exc=0x0, error=0x7ff0fe17c908) at /__w/1/s/src/mono/mono/metadata/object.c:5626
#15 0x00007ff1088e0030 in ves_icall_InternalInvoke (method_handle=..., this_arg_handle=..., params_handle=..., exception_out=..., error=<optimized out>) at /__w/1/s/src/mono/mono/metadata/icall.c:3926
#16 0x00007ff1088eb802 in ves_icall_InternalInvoke_raw (a0=0x7ff0fe17c9d8, a1=0x7ff0fe17c9e0, a2=0x7ff0fe17c9e8, a3=0x7ff0fe17c9d0) at /__w/1/s/src/mono/mono/metadata/icall-def-netcore.h:258
#17 0x0000000041daa20e in ?? ()
#18 0x00007ff104374f90 in ?? ()
#19 0x0000000000000000 in ?? ()

Thread 9 (Thread 0x7ff0fe381700 (LWP 2879)):
#0  0x00007ff1092730e7 in unlink () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007ff105f63245 in SystemNative_Unlink (path=0x7ff0ec7c2c00 "/tmp/tmpswTbbj.tmp") at /__w/1/s/src/libraries/Native/Unix/System.Native/pal_io.c:308
#2  0x0000000042146feb in ?? ()
#3  0xffffffffffffffff in ?? ()
#4  0x00007ff108003ec0 in ?? ()
#5  0x00007ff108003ec0 in ?? ()
#6  0x00007ff0ec797358 in ?? ()
#7  0x00007ff108003f78 in ?? ()
#8  0x00007ff108003ec0 in ?? ()
#9  0x00007ff108003ec0 in ?? ()
#10 0x00007ff0ec000fe0 in ?? ()
#11 0x00007ff0fe37e2a0 in ?? ()
#12 0x00007ff0fe37e110 in ?? ()
#13 0x00007ff0fe37e2a0 in ?? ()
#14 0x00007ff0ec0008c0 in ?? ()
#15 0x00007ff108003ec0 in ?? ()
#16 0x0000000042146cc4 in ?? ()
#17 0x00007ff108003ec0 in ?? ()
#18 0x00007ff108003ec0 in ?? ()
#19 0x00007ff0ec797358 in ?? ()
#20 0x00007ff108003f78 in ?? ()
#21 0xffffffffffffffff in ?? ()
#22 0x00007ff0ec797358 in ?? ()
#23 0x00007ff108003f78 in ?? ()
#24 0x00007ff108003f8c in ?? ()
#25 0x00007ff108003f8c in ?? ()
#26 0x00007ff108003f8c in ?? ()
#27 0x0000000000000012 in ?? ()
#28 0x0000000000000000 in ?? ()

Thread 8 (Thread 0x7ff0fe582700 (LWP 2878)):
#0  0x00007ff1091c93d6 in __GI___sigsuspend (set=0x7ff108cfc1d8 <suspend_signal_mask>) at ../sysdeps/unix/sysv/linux/sigsuspend.c:30
#1  0x00007ff1089fb592 in suspend_signal_handler (_dummy=<optimized out>, info=<optimized out>, context=0x7ff0fe580f80) at /__w/1/s/src/mono/mono/utils/mono-threads-posix-signals.c:200
#2  <signal handler called>
#3  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#4  0x00007ff1089ee144 in mono_os_cond_timedwait (cond=0x824180, mutex=0x824158, timeout_ms=20000) at /__w/1/s/src/mono/mono/utils/mono-os-mutex.c:75
#5  0x00007ff10895db34 in mono_coop_cond_timedwait (cond=<optimized out>, mutex=<optimized out>, timeout_ms=20000) 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=20000, poll=0, alerted=0x7ff0fe58164c) at /__w/1/s/src/mono/mono/metadata/w32handle.c:652
#7  mono_w32handle_timedwait_signal_handle (handle_data=<optimized out>, timeout=20000, poll=0, alerted=0x7ff0fe58164c) at /__w/1/s/src/mono/mono/metadata/w32handle.c:767
#8  0x00007ff10895d9f7 in mono_w32handle_wait_one (handle=<optimized out>, timeout=20000, alertable=<optimized out>) at /__w/1/s/src/mono/mono/metadata/w32handle.c:882
#9  0x00007ff10898cad6 in mono_monitor_wait (obj_handle=..., ms=<optimized out>, allow_interruption=<optimized out>, error=<optimized out>) at /__w/1/s/src/mono/mono/metadata/monitor.c:1438
#10 ves_icall_System_Threading_Monitor_Monitor_wait (obj_handle=..., ms=20000, allow_interruption=<optimized out>, error=<optimized out>) at /__w/1/s/src/mono/mono/metadata/monitor.c:1493
#11 0x00007ff1088f0db9 in ves_icall_System_Threading_Monitor_Monitor_wait_raw (a0=0x7ff0fe5817f0, a1=20000, a2=0 '\000') at /__w/1/s/src/mono/mono/metadata/icall-def-netcore.h:477
#12 0x0000000041e4720f in ?? ()
#13 0x00007ff108252e28 in ?? ()
#14 0x0000000000000046 in ?? ()
#15 0x0000000000000002 in ?? ()
#16 0x00007ff108251668 in ?? ()
#17 0x0000000000004e20 in ?? ()
#18 0x00007ff0e8000fe0 in ?? ()
#19 0x00007ff0fe5818a0 in ?? ()
#20 0x00007ff0fe5817b0 in ?? ()
#21 0x00007ff10825b7b8 in ?? ()
#22 0x0000000041e46f08 in ?? ()
#23 0x00007ff0fe581850 in ?? ()
#24 0x00007ff10825b7b8 in ?? ()
#25 0x0000000000004e20 in ?? ()
#26 0x00007ff108251668 in ?? ()
#27 0x00007ff108943b4d in mono_tls_get_thread () at /__w/1/s/src/mono/mono/utils/mono-tls-inline.h:37
#28 mono_thread_internal_current () at /__w/1/s/src/mono/mono/metadata/threads.c:2164
#29 mono_thread_interruption_checkpoint_request (bypass_abort_protection=1) at /__w/1/s/src/mono/mono/metadata/threads.c:5181
#30 mono_thread_force_interruption_checkpoint_noraise () at /__w/1/s/src/mono/mono/metadata/threads.c:5224
#31 0x0000000000000000 in ?? ()

Thread 7 (Thread 0x7ff1042b3700 (LWP 2877)):
#0  0x00007ff1091c93d6 in __GI___sigsuspend (set=0x7ff108cfc1d8 <suspend_signal_mask>) at ../sysdeps/unix/sysv/linux/sigsuspend.c:30
#1  0x00007ff1089fb592 in suspend_signal_handler (_dummy=<optimized out>, info=<optimized out>, context=0x7ff1042b0f40) at /__w/1/s/src/mono/mono/utils/mono-threads-posix-signals.c:200
#2  <signal handler called>
#3  0x00007ff109fe6b58 in __waitpid (pid=2882, stat_loc=0x7ff1042b153c, options=0) at ../sysdeps/unix/sysv/linux/waitpid.c:29
#4  0x00007ff108855cdb in dump_native_stacktrace (signal=<optimized out>, mctx=<optimized out>) at /__w/1/s/src/mono/mono/mini/mini-posix.c:1083
#5  mono_dump_native_crash_info (signal=<optimized out>, mctx=0x7ff1042b2050, info=<optimized out>) at /__w/1/s/src/mono/mono/mini/mini-posix.c:1129
#6  0x00007ff1087fbdf5 in mono_handle_native_crash (signal=0x7ff108a33f0a "SIGABRT", mctx=0x7ff1042b2050, info=0x7ff1042b2330) at /__w/1/s/src/mono/mono/mini/mini-exceptions.c:3422
#7  0x00007ff108855141 in sigabrt_signal_handler (_dummy=6, _info=0x7ff1042b2330, context=0x7ff1042b2200) at /__w/1/s/src/mono/mono/mini/mini-posix.c:234
#8  <signal handler called>
#9  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#10 0x00007ff1091ca42a in __GI_abort () at abort.c:89
#11 0x00007ff1091c1e67 in __assert_fail_base (fmt=<optimized out>, assertion=assertion@entry=0x7ff105f7233d "cpuUtilization >= 0 && cpuUtilization <= 100", file=file@entry=0x7ff105f7229c "/__w/1/s/src/libraries/Native/Unix/System.Native/pal_time.c", line=line@entry=165, function=function@entry=0x7ff105f722fd "int32_t SystemNative_GetCpuUtilization(ProcessCpuInformation *)") at assert.c:92
#12 0x00007ff1091c1f12 in __GI___assert_fail (assertion=0x7ff105f7233d "cpuUtilization >= 0 && cpuUtilization <= 100", file=0x7ff105f7229c "/__w/1/s/src/libraries/Native/Unix/System.Native/pal_time.c", line=165, function=0x7ff105f722fd "int32_t SystemNative_GetCpuUtilization(ProcessCpuInformation *)") at assert.c:101
#13 0x00007ff105f6e903 in SystemNative_GetCpuUtilization (previousCpuInfo=0x7ff108251970) at /__w/1/s/src/libraries/Native/Unix/System.Native/pal_time.c:165
#14 0x0000000041e378bc in ?? ()
#15 0x00007ff108251988 in ?? ()
#16 0x00007ff1042b2e88 in ?? ()
#17 0x0000000001137768 in ?? ()
#18 0x00007ff108251988 in ?? ()
#19 0x00007ff108251960 in ?? ()
#20 0x00007ff0f4000fe0 in ?? ()
#21 0x00007ff1042b2c00 in ?? ()
#22 0x00007ff0f4000fe0 in ?? ()
#23 0x00007ff1042b2c00 in ?? ()
#24 0x00007ff1042b2b00 in ?? ()
#25 0x00007ff108251a08 in ?? ()
#26 0x00007ff0f40008c0 in ?? ()
#27 0x00007ff1042b2c00 in ?? ()
#28 0x0000000041e37808 in ?? ()
#29 0x00007ff108251a08 in ?? ()
#30 0x0000000041e374c8 in ?? ()
#31 0x0000000000000000 in ?? ()

Thread 6 (Thread 0x7ff104774700 (LWP 2876)):
#0  0x00007ff1091c93d6 in __GI___sigsuspend (set=0x7ff108cfc1d8 <suspend_signal_mask>) at ../sysdeps/unix/sysv/linux/sigsuspend.c:30
#1  0x00007ff1089fb592 in suspend_signal_handler (_dummy=<optimized out>, info=<optimized out>, context=0x7ff104772b40) at /__w/1/s/src/mono/mono/utils/mono-threads-posix-signals.c:200
#2  <signal handler called>
#3  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#4  0x00007ff1089ee144 in mono_os_cond_timedwait (cond=0x8240a0, mutex=0x824078, timeout_ms=12000) at /__w/1/s/src/mono/mono/utils/mono-os-mutex.c:75
#5  0x00007ff10895db34 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
#6  mono_w32handle_timedwait_signal_naked (cond=<optimized out>, mutex=<optimized out>, timeout=12000, poll=0, alerted=0x7ff1047731dc) at /__w/1/s/src/mono/mono/metadata/w32handle.c:652
#7  mono_w32handle_timedwait_signal_handle (handle_data=<optimized out>, timeout=12000, poll=0, alerted=0x7ff1047731dc) at /__w/1/s/src/mono/mono/metadata/w32handle.c:767
#8  0x00007ff10895d9f7 in mono_w32handle_wait_one (handle=<optimized out>, timeout=12000, alertable=<optimized out>) at /__w/1/s/src/mono/mono/metadata/w32handle.c:882
#9  0x00007ff10895dc54 in mono_w32handle_wait_multiple (handles=0x7ff104773900, nhandles=1, waitall=<optimized out>, timeout=12000, alertable=1, error=0xffffffff) at /__w/1/s/src/mono/mono/metadata/w32handle.c:1002
#10 0x00007ff108940486 in ves_icall_System_Threading_WaitHandle_Wait_internal (handles=0x7ff104773900, numhandles=1, waitall=<optimized out>, timeout=12000, error=0x7ff104773830) at /__w/1/s/src/mono/mono/metadata/threads.c:2313
#11 0x00007ff1088f1900 in ves_icall_System_Threading_WaitHandle_Wait_internal_raw (a0=0x7ff104773900, a1=1, a2=0 '\000', a3=12000) at /__w/1/s/src/mono/mono/metadata/icall-def-netcore.h:510
#12 0x0000000041de2ee2 in ?? ()
#13 0x00007ff108251738 in ?? ()
#14 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7ff104979700 (LWP 2875)):
#0  0x00007ff109fe5556 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x7ff108cfc060 <suspend_semaphore>) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x7ff108cfc060 <suspend_semaphore>, abstime=0x0) at sem_waitcommon.c:111
#2  0x00007ff109fe5604 in __new_sem_wait_slow (sem=0x7ff108cfc060 <suspend_semaphore>, abstime=0x0) at sem_waitcommon.c:181
#3  0x00007ff1089f62e8 in mono_os_sem_wait (sem=<optimized out>, flags=<optimized out>) at /__w/1/s/src/mono/mono/utils/mono-os-semaphore.h:203
#4  mono_os_sem_timedwait (sem=0x7ff108cfc060 <suspend_semaphore>, timeout_ms=4294967295, flags=MONO_SEM_FLAGS_NONE) at /__w/1/s/src/mono/mono/utils/mono-os-semaphore.h:236
#5  0x00007ff1089f5ff6 in mono_threads_wait_pending_operations () at /__w/1/s/src/mono/mono/utils/mono-threads.c:318
#6  0x00007ff108998d70 in sgen_unified_suspend_stop_world () at /__w/1/s/src/mono/mono/metadata/sgen-stw.c:306
#7  sgen_client_stop_world (generation=0, serial_collection=0) at /__w/1/s/src/mono/mono/metadata/sgen-stw.c:124
#8  0x00007ff1089abddd in sgen_stop_world (generation=0, serial_collection=0) at /__w/1/s/src/mono/mono/sgen/sgen-gc.c:3869
#9  0x00007ff1089a8b1f 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
#10 sgen_perform_collection (requested_size=4096, generation_to_collect=0, reason=0x7ff108a6e16e "Nursery full", forced_serial=0, stw=1) at /__w/1/s/src/mono/mono/sgen/sgen-gc.c:2679
#11 0x00007ff1089a8a83 in sgen_ensure_free_space (size=4096, generation=<optimized out>) at /__w/1/s/src/mono/mono/sgen/sgen-gc.c:2545
#12 0x00007ff10899e41e in sgen_alloc_obj_nolock (vtable=0xf68890, size=128) at /__w/1/s/src/mono/mono/sgen/sgen-alloc.c:279
#13 0x00007ff10899e899 in sgen_alloc_obj (vtable=0xf68890, size=128) at /__w/1/s/src/mono/mono/sgen/sgen-alloc.c:454
#14 0x00007ff10899a876 in mono_gc_alloc_obj (vtable=0x7ff108cfc060 <suspend_semaphore>, size=393) at /__w/1/s/src/mono/mono/metadata/sgen-mono.c:921
#15 0x0000000041d10727 in ?? ()
#16 0x00007ff108156e48 in ?? ()
#17 0x00007ff0f8000f30 in ?? ()
#18 0x00007ff0f80008c0 in ?? ()
#19 0x0000000000f68890 in ?? ()
#20 0x0000000000000080 in ?? ()
#21 0x00007ff0f80438f0 in ?? ()
#22 0x00007ff108156ec8 in ?? ()
#23 0x00007ff104978750 in ?? ()
#24 0x00007ff1045108c0 in ?? ()
#25 0x0000000041d0ad04 in ?? ()
#26 0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7ff104a9b700 (LWP 2872)):
#0  0x00007ff109fe622d in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007ff105f6dd3e in SignalHandlerLoop (arg=0xf50430) at /__w/1/s/src/libraries/Native/Unix/System.Native/pal_signal.c:90
#2  0x00007ff109fdd4a4 in start_thread (arg=0x7ff104a9b700) at pthread_create.c:456
#3  0x00007ff10927ed0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 3 (Thread 0x7ff10651a700 (LWP 2871)):
#0  0x00007ff109fe5556 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x7ff108ced068 <finalizer_sem>) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x7ff108ced068 <finalizer_sem>, abstime=0x0) at sem_waitcommon.c:111
#2  0x00007ff109fe5604 in __new_sem_wait_slow (sem=0x7ff108ced068 <finalizer_sem>, abstime=0x0) at sem_waitcommon.c:181
#3  0x00007ff10898b298 in mono_os_sem_wait (sem=<optimized out>, flags=MONO_SEM_FLAGS_ALERTABLE) at /__w/1/s/src/mono/mono/utils/mono-os-semaphore.h:203
#4  mono_coop_sem_wait (sem=<optimized out>, flags=MONO_SEM_FLAGS_ALERTABLE) at /__w/1/s/src/mono/mono/utils/mono-coop-semaphore.h:41
#5  finalizer_thread (unused=<optimized out>) at /__w/1/s/src/mono/mono/metadata/gc.c:965
#6  0x00007ff10894592a in start_wrapper_internal (start_info=0x0, stack_ptr=<optimized out>) at /__w/1/s/src/mono/mono/metadata/threads.c:1232
#7  0x00007ff1089457a9 in start_wrapper (data=0x885280) at /__w/1/s/src/mono/mono/metadata/threads.c:1307
#8  0x00007ff109fdd4a4 in start_thread (arg=0x7ff10651a700) at pthread_create.c:456
#9  0x00007ff10927ed0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 2 (Thread 0x7ff107fff700 (LWP 2870)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007ff1089dcf03 in mono_os_cond_wait (cond=<optimized out>, mutex=<optimized out>) at /__w/1/s/src/mono/mono/utils/mono-os-mutex.h:219
#2  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
#3  thread_func (data=0x0) at /__w/1/s/src/mono/mono/sgen/sgen-thread-pool.c:196
#4  0x00007ff109fdd4a4 in start_thread (arg=0x7ff107fff700) at pthread_create.c:456
#5  0x00007ff10927ed0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 1 (Thread 0x7ff10a406740 (LWP 2869)):
#0  0x00007ff1091c93d6 in __GI___sigsuspend (set=0x7ff108cfc1d8 <suspend_signal_mask>) at ../sysdeps/unix/sysv/linux/sigsuspend.c:30
#1  0x00007ff1089fb592 in suspend_signal_handler (_dummy=<optimized out>, info=<optimized out>, context=0x7ffc2d6dda80) at /__w/1/s/src/mono/mono/utils/mono-threads-posix-signals.c:200
#2  <signal handler called>
#3  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:183
#4  0x00007ff1089ee160 in mono_os_cond_wait (cond=0x823f50, mutex=0x823f28) at /__w/1/s/src/mono/mono/utils/mono-os-mutex.h:219
#5  mono_os_cond_timedwait (cond=0x823f50, mutex=0x823f28, timeout_ms=1) at /__w/1/s/src/mono/mono/utils/mono-os-mutex.c:32
#6  0x00007ff10895db34 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
#7  mono_w32handle_timedwait_signal_naked (cond=<optimized out>, mutex=<optimized out>, timeout=4294967295, poll=0, alerted=0x7ffc2d6de10c) at /__w/1/s/src/mono/mono/metadata/w32handle.c:652
#8  mono_w32handle_timedwait_signal_handle (handle_data=<optimized out>, timeout=4294967295, poll=0, alerted=0x7ffc2d6de10c) at /__w/1/s/src/mono/mono/metadata/w32handle.c:767
#9  0x00007ff10895d9f7 in mono_w32handle_wait_one (handle=<optimized out>, timeout=4294967295, alertable=<optimized out>) at /__w/1/s/src/mono/mono/metadata/w32handle.c:882
#10 0x00007ff10895dc54 in mono_w32handle_wait_multiple (handles=0x7ffc2d6de830, nhandles=1, waitall=<optimized out>, timeout=4294967295, alertable=1, error=0x0) at /__w/1/s/src/mono/mono/metadata/w32handle.c:1002
#11 0x00007ff108940486 in ves_icall_System_Threading_WaitHandle_Wait_internal (handles=0x7ffc2d6de830, numhandles=1, waitall=<optimized out>, timeout=-1, error=0x7ffc2d6de760) at /__w/1/s/src/mono/mono/metadata/threads.c:2313
#12 0x00007ff1088f1900 in ves_icall_System_Threading_WaitHandle_Wait_internal_raw (a0=0x7ffc2d6de830, a1=1, a2=0 '\000', a3=-1) at /__w/1/s/src/mono/mono/metadata/icall-def-netcore.h:510
#13 0x0000000041de2ee2 in ?? ()
#14 0x00007ff108236368 in ?? ()
#15 0x0000000000000000 in ?? ()

=================================================================
	Basic Fault Address Reporting
=================================================================
Memory around native instruction pointer (0x7ff1091c8fff):0x7ff1091c8fef  d2 4c 89 ce bf 02 00 00 00 b8 0e 00 00 00 0f 05  .L..............
0x7ff1091c8fff  48 81 c4 88 00 00 00 44 89 c0 5b c3 0f 1f 44 00  H......D..[...D.
0x7ff1091c900f  00 48 8b 15 61 5e 36 00 f7 d8 64 89 02 eb ca 66  .H..a^6...d....f
0x7ff1091c901f  90 85 ff 78 0c f7 df e9 e5 02 00 00 0f 1f 44 00  ...x..........D.

=================================================================
	Managed Stacktrace:
=================================================================
	  at <unknown> <0xffffffff>
	  at Sys:GetCpuUtilization <0x0008b>
	  at CpuUtilizationReader:get_CurrentUtilization <0x00037>
	  at GateThread:GateThreadStart <0x00117>
	  at System.Threading.Thread:StartCallback <0x000ab>
	  at System.Object:runtime_invoke_void__this__ <0x00091>
=================================================================

[stephentoub]

cc: @jkoritzinsky who added this in dotnet/corert#3863, and @filipnavara who ported it to SystemNative in dotnet/corefx#34806.

[jkotas]

#2196