222805 2021-03-05 08:52:14 -0800 Crash with "invalid opcode" if the CPU does not support SSE4 2023-08-17 13:52:51 -0700 1 1 1 Unclassified WebKit JavaScriptCore Other Unspecified Unspecified RESOLVED DUPLICATE 220889 InRadar P2 Normal --- 1 berto webkit-unassigned calvin.walton cgarcia dennisn jernej.jakob+webkit mcatanzaro nekohayo webkit-bug-importer xan.lopez oldest_to_newest 1736361 0 berto 2021-03-05 08:52:14 -0800 A user reported this crash with WebKitGTK 2.30.5 after opening www.avito.ru , selecting "Вход и регистрация" on the upper right corner and simply waiting for a few seconds. (gdb) layout asm >│0x7f00eb999254 <wasm_entry+56936> roundss $0x2,%xmm0,%xmm1 │ │0x7f00eb99925a <wasm_entry+56942> movsbq 0x1(%r13,%r8,1),%r9 │ │0x7f00eb999260 <wasm_entry+56948> movss %xmm1,0x0(%rbp,%r9,8) │ │0x7f00eb999267 <wasm_entry+56955> add $0x3,%r8 │ This is a 64-bit build but the CPU is an old Intel Core 2 without SSE4 instructions. Disabling the JIT ("JavaScriptCoreUseJIT=0") seems to solve the problem. I assume that there is no plan to support such old hardware, but is this simply a WONTFIX or should WebKit disable the JIT conditionally in these cases? 1738910 1 webkit-bug-importer 2021-03-12 08:53:17 -0800 <rdar://problem/75363426> 1739359 2 cgarcia 2021-03-15 03:57:58 -0700 Is this a duplicate of bug #222358? 1739400 3 mcatanzaro 2021-03-15 06:03:40 -0700 (In reply to Alberto Garcia from comment #0) > should WebKit disable the JIT conditionally in these cases? That would be ideal. 1739660 4 mcatanzaro 2021-03-15 14:14:10 -0700 *** Bug 222358 has been marked as a duplicate of this bug. *** 1739876 5 cgarcia 2021-03-16 01:54:59 -0700 Can we just disable JIT when SSE4 is not available? 1739904 6 jernej.jakob+webkit 2021-03-16 05:09:28 -0700 JSC_useBaselineJIT=0 also fixes it for me. I have that exported in my environment . 1739911 7 mcatanzaro 2021-03-16 06:15:15 -0700 (In reply to Carlos Garcia Campos from comment #5) > Can we just disable JIT when SSE4 is not available? Please, though I'm not sure how to test for that easily. I checked and Fedora's baseline is SSE2. I guess Debian's is probably the same, so we would want to check for SSE3 really. 1739913 8 berto 2021-03-16 06:24:23 -0700 (In reply to Michael Catanzaro from comment #7) > I checked and Fedora's baseline is SSE2. I guess Debian's is probably the > same, so we would want to check for SSE3 really. It is, according to https://wiki.debian.org/ArchitectureSpecificsMemo#amd64: "x86_64 with no optional extensions. The core specification includes MMX, SSE and SSE2 so these are OK, but SSE3 and up are not guaranteed." 1971901 9 mcatanzaro 2023-08-17 13:41:48 -0700 This issue is basically the same as bug #220889 and there is a patch there with review feedback, so let's treat this one as the duplicate. *** This bug has been marked as a duplicate of bug 220889 *** 1971904 10 mcatanzaro 2023-08-17 13:45:55 -0700 Well, one possibility not contemplated in bug #220889 would be to automatically disable the JIT if the system does not support SSE4. If somebody wants to attempt that, we could reopen this one.