1678074 - jitsrc fails running arm32 simulator

Status: RESOLVED FIXED

(Core :: JavaScript Engine: JIT, defect)

Description

[Matthew Gaudet (he/him) [:mgaudet]]

Trying to find simulated instructions origin using jitsrc ends with a python exception:

0x57704fcf in js::jit::Simulator::readW (this=0xf6b3f000, addr=0, instr=0x2f5327b0, f=js::jit::Simulator::AllowUnaligned) at /home/matthew/unified/js/src/jit/arm/Simulator-arm.cpp:1534
1534        return *ptr;

Thread 1 hit Hardware watchpoint -13: *0x2f5327b0
Old value = -443547648
New value = 0
0xf7baed3b in ?? () from /lib/i386-linux-gnu/libc.so.6
Traceback (most recent call last):
  File "js/src/gdb/mozilla/jitsrc.py", line 133, in invoke
    address = self.next_address(address)
  File "js/src/gdb/mozilla/jitsrc.py", line 114, in next_address
    found = self.search_stack(*pattern, old)
  File "js/src/gdb/mozilla/jitsrc.py", line 100, in search_stack
    if not re.match(base_name, gdb.newest_frame().name()):
  File "/usr/lib/python3.6/re.py", line 172, in match
    return _compile(pattern, flags).match(string)
TypeError: expected string or bytes-like object
Error occurred in Python command: expected string or bytes-like object

If it helps, here's the backtrace where we stop:

(rr) bt
#0  0xf7baed3b in ?? () from /lib/i386-linux-gnu/libc.so.6
#1  0x576abb73 in js::jit::AssemblerBufferWithConstantPools<1024u, 4u, js::jit::Instruction, js::jit::Assembler, 0u>::executableCopy (this=0xffbfbd94, dest=0x2f5324c0 "\004@", <incomplete sequence \345>)
    at /home/matthew/unified/js/src/jit/shared/IonAssemblerBufferWithConstantPools.h:1166
#2  0x57679d8c in js::jit::Assembler::executableCopy (this=0xffbfbb8c, buffer=0x2f52e0c0 "\004\340-\345\a") at /home/matthew/unified/js/src/jit/arm/Assembler-arm.cpp:526
#3  0x5788a5bd in js::jit::JitCode::copyFrom (this=0xf5c21080, masm=...) at /home/matthew/unified/js/src/jit/Ion.cpp:545
#4  0x579b45b4 in js::jit::Linker::newCode (this=0xffbfbab0, cx=0xf6b22000, kind=js::jit::CodeKind::Other) at /home/matthew/unified/js/src/jit/Linker.cpp:73
#5  0x57564c89 in js::jit::BaselineInterpreterGenerator::generate (this=0xffbfbb28, interpreter=...) at /home/matthew/unified/js/src/jit/BaselineCodeGen.cpp:7094
#6  0x5772b8e5 in js::jit::GenerateBaselineInterpreter (cx=0xf6b22000, interpreter=...) at /home/matthew/unified/js/src/jit/BaselineJIT.cpp:1084
#7  0x578889b6 in js::jit::JitRuntime::initialize (this=0xf6b0b800, cx=0xf6b22000) at /home/matthew/unified/js/src/jit/Ion.cpp:134
#8  0x56e27cfa in JSRuntime::createJitRuntime (this=0xf6b3a000, cx=0xf6b22000) at /home/matthew/unified/js/src/vm/Realm.cpp:148
#9  0x570e79a7 in JS::InitSelfHostedCode (cx=0xf6b22000) at /home/matthew/unified/js/src/jsapi.cpp:485
#10 0x568c8795 in main (argc=2, argv=0xffbfc634, envp=0xffbfc640) at /home/matthew/unified/js/src/shell/js.cpp:11831

Compiled using approximately this mozconfig.

Comment 1

[Matthew Gaudet (he/him) [:mgaudet]]

Attachment: Bug 1678074 - Add some basic jitsrc support for the ARM32 simulator r?iain DONTBUILD

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/7d44116fa058
Add some basic jitsrc support for the ARM32 simulator r=iain DONTBUILD

Comment 3

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

https://hg.mozilla.org/mozilla-central/rev/7d44116fa05800676a2054ce7b4d243c2c472b6c