[ppc64le] Runtime crash in System.Text.RegularExpressions.Tests

[directhex]

Description

Console log: 'System.Text.RegularExpressions.Tests' from job 0704ee99-5984-4856-b01e-ac29d37e7872 workitem dd93bed4-ff82-49f0-94ea-a194fc8b891a (ubuntu.2004.ppc64le.experimental.open) executed on machine dotnet-1
+ ./RunTests.sh --runtime-path /home/helixbot/work/9F6908CF/p
----- start Tue 21 Jun 2022 06:51:53 PM UTC =============== To repro directly: =====================================================
pushd .
/home/helixbot/work/9F6908CF/p/dotnet exec --runtimeconfig System.Text.RegularExpressions.Tests.runtimeconfig.json --depsfile System.Text.RegularExpressions.Tests.deps.json xunit.console.dll System.Text.RegularExpressions.Tests.dll -xml testResults.xml -nologo -nocolor -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing 
popd
===========================================================================================================
~/work/9F6908CF/w/BEDD0A19/e ~/work/9F6908CF/w/BEDD0A19/e
  Discovering: System.Text.RegularExpressions.Tests (method display = ClassAndMethod, method display options = None)
  Discovered:  System.Text.RegularExpressions.Tests (found 289 of 331 test cases)
  Starting:    System.Text.RegularExpressions.Tests (parallel test collections = on, max threads = 2)
* Assertion at /home/directhex/Projects/runtime/src/mono/mono/mini/mini-ppc.c:5080, condition `ppc_is_imm16 (inst->inst_offset)' not met


=================================================================
	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:
=================================================================
	0x7cee60a9ad68 - Unknown
	0x7cee60a49f2c - Unknown
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	0x7cee613a04c8 - Unknown
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	0x7cee60e0b884 - Unknown

=================================================================
	External Debugger Dump:
=================================================================
mono_gdb_render_native_backtraces not supported on this platform, unable to find gdb or lldb

=================================================================
	Basic Fault Address Reporting
=================================================================
Memory around native instruction pointer (0x7cee60d0d168):0x7cee60d0d158  02 00 60 38 00 00 a0 38 08 00 c0 38 02 00 00 44  ..`8...8...8...D
0x7cee60d0d168  26 00 00 7c 28 01 21 e9 f0 8f 4d e9 79 52 29 7d  &..|(.!...M.yR)}
0x7cee60d0d178  00 00 40 39 3c 00 82 40 50 01 21 38 78 fb e3 7f  ..@9<..@P.!8x...
0x7cee60d0d188  10 00 01 e8 e8 ff a1 eb f0 ff c1 eb f8 ff e1 eb  ................

=================================================================
	Managed Stacktrace:
=================================================================
	  at <unknown> <0xffffffff>
	  at <unknown> <0xffffffff>
	  at System.Text.RegularExpressions.CompiledRegexRunner:Regex3588_Scan <0x000b4>
	  at <Module>:invoke_void_RegexRunner_ReadOnlySpan`1<char> <0x000ec>
	  at System.Text.RegularExpressions.CompiledRegexRunner:Scan <0x0004c>
	  at System.Text.RegularExpressions.Regex:ScanInternal <0x0005c>
	  at System.Text.RegularExpressions.Regex:RunSingleMatch <0x00448>
	  at System.Text.RegularExpressions.Regex:IsMatch <0x000e4>
	  at <>c__DisplayClass6_0:<TurkishI_Is_Differently_LowerUpperCased_In_Turkish_Culture>b__0 <0x00050>
	  at <>c__DisplayClass11_0`1:<All>b__0 <0x00044>
	  at Xunit.Assert:All <0x001fc>
	  at Xunit.Assert:All <0x001d0>
	  at System.Text.RegularExpressions.Tests.RegexCultureTests:TurkishI_Is_Differently_LowerUpperCased_In_Turkish_Culture <0x00324>
	  at <Module>:runtime_invoke_void__this___int_int <0x000f0>
	  at <unknown> <0xffffffff>
	  at System.Reflection.RuntimeMethodInfo:InternalInvoke <0x000f8>
	  at System.Reflection.MethodInvoker:InterpretedInvoke <0x000b8>
	  at System.Reflection.RuntimeMethodInfo:Invoke <0x005a4>
	  at System.Reflection.MethodBase:Invoke <0x00050>
	  at Xunit.Sdk.TestInvoker`1:CallTestMethod <0x00058>
	  at <<InvokeTestMethodAsync>b__1>d:MoveNext <0x004a0>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x000fc>
	  at System.Runtime.CompilerServices.AsyncTaskMethodBuilder:Start <0x00040>
	  at <>c__DisplayClass48_0:<InvokeTestMethodAsync>b__1 <0x000ec>
	  at <AggregateAsync>d__4:MoveNext <0x000f0>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x000f4>
	  at Xunit.Sdk.ExecutionTimer:AggregateAsync <0x00100>
	  at <>c__DisplayClass48_0:<InvokeTestMethodAsync>b__0 <0x001d0>
	  at <RunAsync>d__9:MoveNext <0x00080>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x000ec>
	  at Xunit.Sdk.ExceptionAggregator:RunAsync <0x000fc>
	  at <InvokeTestMethodAsync>d__48:MoveNext <0x00374>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x00104>
	  at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1:Start <0x00040>
	  at Xunit.Sdk.TestInvoker`1:InvokeTestMethodAsync <0x00130>
	  at Xunit.Sdk.XunitTestInvoker:InvokeTestMethodAsync <0x001cc>
	  at <<RunAsync>b__47_0>d:MoveNext <0x00754>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x0010c>
	  at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1:Start <0x00040>
	  at Xunit.Sdk.TestInvoker`1:<RunAsync>b__47_0 <0x000f4>
	  at <RunAsync>d__10`1:MoveNext <0x0008c>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x000ec>
	  at Xunit.Sdk.ExceptionAggregator:RunAsync <0x000fc>
	  at Xunit.Sdk.TestInvoker`1:RunAsync <0x00158>
	  at Xunit.Sdk.XunitTestRunner:InvokeTestMethodAsync <0x00100>
	  at <InvokeTestAsync>d__4:MoveNext <0x001fc>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x000fc>
	  at Xunit.Sdk.XunitTestRunner:InvokeTestAsync <0x00104>
	  at <>c__DisplayClass43_0:<RunAsync>b__0 <0x00040>
	  at <RunAsync>d__10`1:MoveNext <0x000c4>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x000fc>
	  at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1:Start <0x00040>
	  at Xunit.Sdk.ExceptionAggregator:RunAsync <0x00134>
	  at <RunAsync>d__43:MoveNext <0x00648>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x0010c>
	  at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1:Start <0x00040>
	  at Xunit.Sdk.TestRunner`1:RunAsync <0x000f4>
	  at <RunTestAsync>d__11:MoveNext <0x00264>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x0010c>
	  at Xunit.Sdk.XunitTheoryTestCaseRunner:RunTestAsync <0x000cc>
	  at <RunAsync>d__19:MoveNext <0x00410>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x00104>
	  at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1:Start <0x00040>
	  at Xunit.Sdk.TestCaseRunner`1:RunAsync <0x000f0>
	  at Xunit.Sdk.XunitTheoryTestCase:RunAsync <0x00110>
	  at Xunit.Sdk.XunitTestMethodRunner:RunTestCaseAsync <0x000d4>
	  at <RunTestCasesAsync>d__32:MoveNext <0x00208>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x0010c>
	  at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1:Start <0x00040>
	  at Xunit.Sdk.TestMethodRunner`1:RunTestCasesAsync <0x000f4>
	  at <RunAsync>d__31:MoveNext <0x00270>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x000fc>
	  at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1:Start <0x00040>
	  at Xunit.Sdk.TestMethodRunner`1:RunAsync <0x000ec>
	  at Xunit.Sdk.XunitTestClassRunner:RunTestMethodAsync <0x00148>
	  at <RunTestMethodsAsync>d__38:MoveNext <0x00a00>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x00114>
	  at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1:Start <0x00040>
	  at Xunit.Sdk.TestClassRunner`1:RunTestMethodsAsync <0x000f8>
	  at <RunAsync>d__37:MoveNext <0x0044c>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x00104>
	  at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1:Start <0x00040>
	  at Xunit.Sdk.TestClassRunner`1:RunAsync <0x000f0>
	  at Xunit.Sdk.XunitTestCollectionRunner:RunTestClassAsync <0x0014c>
	  at <RunTestClassesAsync>d__28:MoveNext <0x004c8>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x0010c>
	  at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1:Start <0x00040>
	  at Xunit.Sdk.TestCollectionRunner`1:RunTestClassesAsync <0x000f4>
	  at <RunAsync>d__27:MoveNext <0x0044c>
	  at System.Runtime.CompilerServices.AsyncMethodBuilderCore:Start <0x00104>
	  at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1:Start <0x00040>
	  at Xunit.Sdk.TestCollectionRunner`1:RunAsync <0x000f0>
	  at Xunit.Sdk.XunitTestAssemblyRunner:RunTestCollectionAsync <0x00128>
	  at <>c__DisplayClass14_2:<RunTestCollectionsAsync>b__2 <0x0006c>
	  at System.Threading.Tasks.Task`1:InnerInvoke <0x000a4>
	  at <>c:<.cctor>b__273_0 <0x00038>
	  at System.Threading.ExecutionContext:RunInternal <0x00124>
	  at System.Threading.Tasks.Task:ExecuteWithThreadLocal <0x003e4>
	  at System.Threading.Tasks.Task:ExecuteEntry <0x00148>
	  at <>c:<.cctor>b__8_0 <0x0007c>
	  at Xunit.Sdk.MaxConcurrencySyncContext:RunOnSyncContext <0x0007c>
	  at <>c__DisplayClass11_0:<WorkerThreadProc>b__0 <0x00064>
	  at System.Threading.ExecutionContext:RunInternal <0x00124>
	  at System.Threading.ExecutionContext:Run <0x00074>
	  at System.Object:lambda_method2 <0x000a8>
	  at Xunit.Sdk.ExecutionContextHelper:Run <0x00094>
	  at Xunit.Sdk.MaxConcurrencySyncContext:WorkerThreadProc <0x002e0>
	  at <>c:<QueueUserWorkItem>b__5_0 <0x00084>
	  at System.Threading.Tasks.Task:InnerInvoke <0x000ec>
	  at <>c:<.cctor>b__273_0 <0x00038>
	  at System.Threading.ExecutionContext:RunInternal <0x00124>
	  at System.Threading.Tasks.Task:ExecuteWithThreadLocal <0x003e4>
	  at System.Threading.Tasks.Task:ExecuteEntryUnsafe <0x00100>
	  at <>c:<.cctor>b__10_0 <0x00080>
	  at System.Threading.Thread:StartCallback <0x00188>
	  at System.Object:runtime_invoke_void__this__ <0x000dc>
=================================================================
./RunTests.sh: line 168:  9471 Aborted                 (core dumped) "$RUNTIME_PATH/dotnet" exec --runtimeconfig System.Text.RegularExpressions.Tests.runtimeconfig.json --depsfile System.Text.RegularExpressions.Tests.deps.json xunit.console.dll System.Text.RegularExpressions.Tests.dll -xml testResults.xml -nologo -nocolor -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing $RSP_FILE
~/work/9F6908CF/w/BEDD0A19/e
----- end Tue 21 Jun 2022 06:54:29 PM UTC ----- 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.
ulimit -c value: unlimited
[   19.129118] systemd[1]: Mounting Kernel Debug File System...
[   19.131385] systemd[1]: Mounting Kernel Trace File System...
[   19.134475] systemd[1]: Starting Journal Service...
[   19.136731] systemd[1]: Starting Set the console keyboard layout...
[   19.139217] systemd[1]: Starting Create list of static device nodes for the current kernel...
[   19.141491] systemd[1]: Starting Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling...
[   19.142154] systemd[1]: Condition check resulted in Load Kernel Module drm being skipped.
[   19.142448] systemd[1]: Condition check resulted in OpenVSwitch configuration for cleanup being skipped.
[   19.164245] systemd[1]: Condition check resulted in Set Up Additional Binary Formats being skipped.
[   19.564904] systemd[1]: Starting Load Kernel Modules...
[   19.567375] systemd[1]: Starting Remount Root and Kernel File Systems...
[   19.569695] systemd[1]: Starting udev Coldplug all Devices...
[   19.571898] systemd[1]: Starting Uncomplicated firewall...
[   19.574967] systemd[1]: Mounted Huge Pages File System.
[   19.575725] systemd[1]: Mounted POSIX Message Queue File System.
[   19.576499] systemd[1]: Mounted Kernel Debug File System.
[   19.577205] systemd[1]: Mounted Kernel Trace File System.
[   19.579142] systemd[1]: Finished Create list of static device nodes for the current kernel.
[   19.692274] systemd[1]: Finished udev Coldplug all Devices.
[   19.694968] systemd[1]: Starting udev Wait for Complete Device Initialization...
[   19.722088] systemd[1]: Finished Set the console keyboard layout.
[   19.846097] EXT4-fs (sda1): re-mounted. Opts: (null)
[   19.849803] systemd[1]: Finished Remount Root and Kernel File Systems.
[   20.339624] systemd[1]: Condition check resulted in Rebuild Hardware Database being skipped.
[   20.339941] systemd[1]: Condition check resulted in Platform Persistent Storage Archival being skipped.
[   20.342096] systemd[1]: Starting Load/Save Random Seed...
[   20.344432] systemd[1]: Starting Create System Users...
[   20.345213] systemd[1]: Started Journal Service.
[   20.469082] IPMI message handler: version 39.2
[   20.513260] ipmi device interface
[   20.545017] systemd-journald[333]: Received client request to flush runtime journal.
[   27.982050] alua: device handler registered
[   27.989784] emc: device handler registered
[   27.992118] rdac: device handler registered
[   29.007701] audit: type=1400 audit(1655821579.064:2): apparmor="STATUS" operation="profile_load" profile="unconfined" name="nvidia_modprobe" pid=597 comm="apparmor_parser"
[   29.007707] audit: type=1400 audit(1655821579.064:3): apparmor="STATUS" operation="profile_load" profile="unconfined" name="nvidia_modprobe//kmod" pid=597 comm="apparmor_parser"
[   29.012064] audit: type=1400 audit(1655821579.068:4): apparmor="STATUS" operation="profile_load" profile="unconfined" name="lsb_release" pid=596 comm="apparmor_parser"
[   29.030944] audit: type=1400 audit(1655821579.088:5): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/bin/man" pid=602 comm="apparmor_parser"
[   29.030949] audit: type=1400 audit(1655821579.088:6): apparmor="STATUS" operation="profile_load" profile="unconfined" name="man_filter" pid=602 comm="apparmor_parser"
[   29.030952] audit: type=1400 audit(1655821579.088:7): apparmor="STATUS" operation="profile_load" profile="unconfined" name="man_groff" pid=602 comm="apparmor_parser"
[   29.065667] audit: type=1400 audit(1655821579.120:8): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/snapd/snap-confine" pid=600 comm="apparmor_parser"
[   29.065672] audit: type=1400 audit(1655821579.120:9): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/snapd/snap-confine//mount-namespace-capture-helper" pid=600 comm="apparmor_parser"
[   29.587352] audit: type=1400 audit(1655821579.644:10): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/sbin/tcpdump" pid=603 comm="apparmor_parser"
[   30.001781] audit: type=1400 audit(1655821580.056:11): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=604 comm="apparmor_parser"
[   60.055708] fbcon: Taking over console
[   60.060675] Console: switching to colour frame buffer device 128x48
[15383.139777] can: controller area network core (rev 20170425 abi 9)
[15383.139809] NET: Registered protocol family 29
[15383.151361] can: raw protocol (rev 20170425)
[15390.641697] can: request_module (can-proto-0) failed.
Waiting a few seconds for any dump to be written..
cat /proc/sys/kernel/core_pattern: |/usr/share/apport/apport -p%p -s%s -c%c -d%d -P%P -u%u -g%g -- %E
cat /proc/sys/kernel/core_uses_pid: 0
cat: /proc/sys/kernel/coredump_filter: No such file or directory
cat /proc/sys/kernel/coredump_filter:
Looking around for any Linux dump..
... found no dump in /home/helixbot/work/9F6908CF/w/BEDD0A19/e
+ export _commandExitCode=134
+ exit 134

Reproduction Steps

Run test as normal

Configuration

git master on ppc64le

[vikasgupta8]

The crash is observed due to self modifying code at runtime by JIT.
On debugging we found below sequence of powerpc instruction are generated at run time.
In multithreaded environment, these instructions should be thread safe, as these instructions are not thread safe, while one thread is reading these instruction another thread tries to modify these instructions and hence as a result r12 register gets the mixed address and call the incorrect address.

lis     r12,0
ori     r12,r12,29261
rldicr  r12,r12,32,31
oris    r12,r12,44947
ori     r12,r12,32224     // r12 should resolve to this address 0x724daf937de0 but gets resolve to wrong address in runtime 
mtlr    r12
blrl

Further, to resolve this we need to update the mechanism to generate the target address to an atomic instruction to load target address from memory and call it directly.

Currently, the mono code for powerpc uses code patching for this, we need to implement memory patching instead.

Similar fix is implemented for s390x in PR #52783

If anyone has any pointers/suggestion please share.

[alhad-deshpande]

@directhex
The PR 73616 raised for memory patch thunking fixes crashes observed in System.Text.RegularExpressions.Tests due to code being patched non-atomically.

The assertion mentioned above in this issue "Assertion at /home/directhex/Projects/runtime/src/mono/mono/mini/mini-ppc.c:5080, condition `ppc_is_imm16 (inst->inst_offset)' not met" is observed only in Release mode which we are looking at.

Also, there are new test cases added in RegexPcreTests.cs file which are also failing on Power and hence looking into it as well.

[alhad-deshpande]

@directhex
Can we close this issue now as this specific g_assert has been fixed and above PR's are merged?