Closed Bug 1346269 Opened 5 years ago Closed 5 years ago

Crash in js::jit::AutoFlushICache::AutoFlushICache


(Core :: JavaScript Engine: JIT, defect, P1)




Tracking Status
firefox52 --- wontfix
firefox-esr52 --- disabled
firefox53 --- fixed
firefox54 --- fixed
firefox55 --- fixed


(Reporter: jseward, Assigned: luke)


(Keywords: crash)

Crash Data


(1 file)

This bug was filed from the Socorro interface and is 
report bp-02ae372f-45d3-46ac-8b4b-e32cd2170309.

This is the #2 crash in the Android nightly of 20170309110217.
Flags: needinfo?(jdemooij)
wasm::DeserializeModule on the stack.
Ah, so we're deserializing a module off the main thread and the build-id mismatches so we're recompiling, and deep inside someone is assuming we're on a JSContext's main thread so TlsContext.get() is non-null, but we're on some IDB thread so it is indeed null.  The whole point of this AFC is just to suppress icache flushing; let's see if there's a better way to do that that doesn't involve a JSContext*.
Attached patch fix-afcSplinter Review
The simplest solution I found is just to make the suppression explicit as a parameter.
Assignee: nobody → luke
Attachment #8846059 - Flags: review?(bbouvier)
Flags: needinfo?(jdemooij)
Comment on attachment 8846059 [details] [diff] [review]

Review of attachment 8846059 [details] [diff] [review]:

Attachment #8846059 - Flags: review?(bbouvier) → review+
Pushed by
Baldr: remove dependency on TlsContext in ModuleGenerator::finish (r=bbouvier)
Priority: -- → P1
What is the version this was introduced? We should backport this.
Closed: 5 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla55
crash-stats shows crashes on 52 for this (all Android, though). Given that this patch touches non-ARM code as well, I'm wondering if it's worth backporting to ESR52 as well. There are some Tier 3 ARM & Android builds off that branch IIRC.
esr52 hasn't shipped wasm (bug 1342440), so no need to backport there. Other platforms are worth it, though. Thanks!
Flags: needinfo?(luke)
Comment on attachment 8846059 [details] [diff] [review]

Approval Request Comment
[Feature/Bug causing the regression]: 1342060
[User impact if declined]: crash in FF Android when deserializing wasm module after build-id change
[Is this code covered by automated tests?]: yes
[Has the fix been verified in Nightly?]: yes
[Needs manual test from QE? If yes, steps to reproduce]: no
[List of other uplifts needed for the feature/fix]: none
[Is the change risky?]: no
[Why is the change risky/not risky?]: pretty simple change, just adding/propagating an additional parameter
Flags: needinfo?(luke)
Attachment #8846059 - Flags: approval-mozilla-beta?
Attachment #8846059 - Flags: approval-mozilla-aurora?
Comment on attachment 8846059 [details] [diff] [review]

fix a crash in wasm, beta53+, aurora54+
Attachment #8846059 - Flags: approval-mozilla-beta?
Attachment #8846059 - Flags: approval-mozilla-beta+
Attachment #8846059 - Flags: approval-mozilla-aurora?
Attachment #8846059 - Flags: approval-mozilla-aurora+
Comment on attachment 8846059 [details] [diff] [review]

Fix a crash. Beta53+ & Aurora54+.
Setting qe-verify- based on Luke's assessment on manual testing needs (see Comment 10) and the fact that this fix has automated coverage.
Flags: qe-verify-
You need to log in before you can comment on or make changes to this bug.