Failures on [vm] Fix v8 snapshot profile issue with deferred libaries.

[alexmarkov]

There are new test failures on [vm] Fix v8 snapshot profile issue with deferred libaries..

The tests

vm/dart/regress_flutter169921_test RuntimeError (expected Pass)

are failing on configurations

vm-aot-linux-debug-arm64
vm-aot-linux-debug-simarm_x64
vm-aot-linux-debug-simriscv32
vm-aot-linux-debug-simriscv64
vm-aot-linux-debug-x64
vm-aot-linux-debug-x64c
vm-aot-mac-debug-arm64
vm-aot-mac-debug-x64
vm-aot-win-debug-arm64
vm-aot-win-debug-x64
vm-aot-win-debug-x64c

../../runtime/vm/app_snapshot.cc: 7689: error: expected: HasRef(elem)
version=3.11.0-edge (main) (Unknown timestamp) on "linux_x64"
pid=75227, thread=75227, isolate_group=isolate(0x58fa6332b550), isolate=isolate(0x58fa633286d0)
os=linux, arch=x64, comp=no, sim=no
isolate_instructions=0, vm_instructions=0
fp=7fff8cdbbfc0, sp=7fff8cdbbf90, pc=58fa3796ceb6
  pc 0x000058fa3796ceb6 fp 0x00007fff8cdbbfc0 dart::Profiler::DumpStackTrace+0x26
  pc 0x000058fa3769d4d2 fp 0x00007fff8cdbc0a0 dart::Assert::Fail+0x82
  pc 0x000058fa3771ffce fp 0x00007fff8cdbc130 dart::Serializer::CreateArtificialNodeIfNeeded+0x88e
  pc 0x000058fa3773ba7f fp 0x00007fff8cdbc1b0 dart::CodeSerializationCluster::WriteFill+0x14f
  pc 0x000058fa3773b341 fp 0x00007fff8cdbc200 dart::CodeSerializationCluster::WriteFill+0x111
  pc 0x000058fa3772725f fp 0x00007fff8cdbc2c0 dart::Serializer::Serialize+0x96f
  pc 0x000058fa3772b165 fp 0x00007fff8cdbc550 dart::FullSnapshotWriter::WriteProgramSnapshot+0x1e5
  pc 0x000058fa3772bab5 fp 0x00007fff8cdbc570 dart::FullSnapshotWriter::WriteFullSnapshot+0x35
  pc 0x000058fa3813c6fc fp 0x00007fff8cdbc950 dart::CreateAppAOTSnapshot+0x44c
  pc 0x000058fa3813cda1 fp 0x00007fff8cdbca50 dart::Split+0x371
  pc 0x000058fa3813d5a6 fp 0x00007fff8cdbcb20 Dart_CreateAppAOTSnapshotAsElfs+0xe6
  pc 0x000058fa3766e97b fp 0x00007fff8cdbcc90 dart::bin::main+0xbbb
-- End of DumpStackTrace

stderr:
Unhandled exception:
Command failed with unexpected exit code (was -6)
#0      run (file:///b/s/w/ir/runtime/tests/vm/dart/use_flag_test_helper.dart:239)
<asynchronous suspension>
#1      main.<anonymous closure> (file:///b/s/w/ir/runtime/tests/vm/dart/regress_flutter169921_test.dart:50)
<asynchronous suspension>
#2      withTempDir (file:///b/s/w/ir/runtime/tests/vm/dart/use_flag_test_helper.dart:308)
<asynchronous suspension>
#3      main (file:///b/s/w/ir/runtime/tests/vm/dart/regress_flutter169921_test.dart:34)
<asynchronous suspension>

--- Re-run this test:
python3 tools/test.py -n vm-aot-linux-debug-x64 vm/dart/regress_flutter169921_test

log

The test was added in 5b69fdd and immediately started failing on all AOT debug bots.

@sstrickl Could you take a look?

[sstrickl]

Looking into it. It looks like the mint is in the code's object pool but not reachable from the global object pool (else it'd already have a ref assigned by this point due to the tracing of the roots first off), so checking to see why.