RFR: 8350284: WebKit 620.1 crashes on startup on Windows x86 32-bit
Roman Marchenko
rmarchenko at openjdk.org
Tue Apr 8 07:52:23 UTC 2025
All the crashes are on "`movaps`" instructions, like "`movaps xmmword ptr [esi+0x30], xmm0`".
"`movaps`" must operate with aligned addresses as
> When the source or destination operand is a memory operand, the operand must be aligned on a 16-byte boundary or a general-protection exception (#GP) is generated
written in docs. When crashes, ESI contains value like `0x27DB63A8`, so it doesn’t seem aligned to 16-byte boundary. The line "`siginfo: ExceptionCode=0xc0000005, reading address 0xffffffff`" from `hs_err` file implicitly says it is GP, not a real "reading address 0xffffffff".
It might be related to clang-cl bug, see https://github.com/llvm/llvm-project/issues/55844
The workaround is to disable SSE when building 32bit on Windows. (`-mno-sse`)
-------------
Commit messages:
- 8350284: WebKit 620.1 crashes on startup on Windows x86 32-bit
Changes: https://git.openjdk.org/jfx/pull/1764/files
Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1764&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8350284
Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
Patch: https://git.openjdk.org/jfx/pull/1764.diff
Fetch: git fetch https://git.openjdk.org/jfx.git pull/1764/head:pull/1764
PR: https://git.openjdk.org/jfx/pull/1764
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