My commit might have uncovered an old bug in eraseUsesOfInstruction by changing
which large-types are expanded in the optimizer, but it did not cause this
underlying problem:
There’s a bug in the recursive eraser’s logic that, in rare occasions, deletes
a ‘user’ that’s yet to be iterated over in the Instruction’s users loop. This
caused the compiler to crash.
Last week I upstream a commit that worked around this issue by adding the
following check:
if (!User) {
continue;
}
I am assuming ASAN is hitting this issue now.
Regards,
—Joe | | 📧 [email protected] | 📱(+1) 408-930-5203
> On Aug 29, 2017, at 4:17 PM, Michael Ilseman <[email protected]> wrote:
>
> Asan is detecting a use after free. Michael G or Joe, is this likely either
> of you?
>
> SUMMARY: AddressSanitizer: heap-use-after-free
> (/Users/buildnode/jenkins/workspace/oss-swift-incremental-ASAN-RA-osx/buildbot_incremental_asan/swift-macosx-x86_64/bin/swift:x86_64+0x101bc796c)
> in swift::eraseUsesOfInstruction(swift::SILInstruction*,
> std::__1::function<void (swift::SILInstruction*)>)
>
>
>> On Aug 29, 2017, at 4:15 PM, [email protected] <mailto:[email protected]>
>> wrote:
>>
>> [FAILURE] oss-swift-incremental-ASAN-RA-osx [#114]
>>
>> Build URL: https://ci.swift.org/job/oss-swift-incremental-ASAN-RA-osx/114/
>> <https://ci.swift.org/job/oss-swift-incremental-ASAN-RA-osx/114/>
>> Project: oss-swift-incremental-ASAN-RA-osx
>> Date of build: Tue, 29 Aug 2017 16:26:15 -0500
>> Build duration: 1 hr 50 min
>>
>> Changes
>>
>> Commit 58fefc174cb6fade894c9c9349dbf34bab7f34a6 by mgottesman:
>> [sil-ownership] is_nonnull does not take trivial values, it takes
>>
>> edit: test/SIL/ownership-verifier/use_verifier.sil
>> edit: lib/SIL/SILOwnershipVerifier.cpp
>>
>> Commit fb1b2a8d9d2277a53c7b1bc76f983ccd38b9f925 by shajrawi:
>> Use emitCopy/Destroy value instead of LoweredCopy/Destroy for large
>>
>> edit: lib/SILOptimizer/Transforms/SILLowerAggregateInstrs.cpp
>> edit: lib/SILOptimizer/Transforms/SILMem2Reg.cpp
>> edit: lib/SIL/TypeLowering.cpp
>>
>> Commit 5c65887fd00e99237eb1032634249634e8a7a236 by xi_ge:
>> [SourceKit] Add function argument when optional chaining is used
>>
>> edit: lib/IDE/SyntaxModel.cpp
>> edit: test/IDE/structure.swift
>> edit: test/SourceKit/DocumentStructure/structure.swift.response
>> edit: test/SourceKit/DocumentStructure/Inputs/main.swift
>
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