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[SR-12555] Xcode 11.4 / Swift 5.2 makes app crash during launch on 32-bit devices #54999

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swift-ci opened this issue Apr 9, 2020 · 5 comments
Open

[SR-12555] Xcode 11.4 / Swift 5.2 makes app crash during launch on 32-bit devices #54999

swift-ci opened this issue Apr 9, 2020 · 5 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior.

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swift-ci commented Apr 9, 2020

Previous ID SR-12555
Radar rdar://problem/62202459
Original Reporter tomkraina (JIRA User)
Type Bug
Environment

Xcode 11.4, Swift 5.2, iOS 10.3.4 running on iPhone 5 devices

Additional Detail from JIRA
Votes 5
Component/s Source Tooling
Labels Bug
Assignee None
Priority Medium

md5: 723eb85759e35b05c471d88725e870cd

Issue Description:

After releasing a new version of app built using Xcode 11.4 to the AppStore, I started receiving crash reports from devices running iOS 10.3. All of the devices are iPhone 5, there goes my suspicion that only 32-bit devices are affected.

The crash reports in Fabric/Crashlytics looks like this:

EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x000000000000

Crashed: com.apple.main-thread
0 GoOut 0x634218 _dyld_register_func_for_add_image$shim
1 (Missing) 0x2800 (Missing)
2 (Missing) 0x9808c0 (Missing)
3 (Missing) 0x6e676953 (Missing)
4 (Missing) 0x7e100000 (Missing)
5 (Missing) 0x4658e0a6 (Missing)
EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x000000000000

Crashed: com.apple.main-thread
0 GoOut 0x66c218 _dyld_register_func_for_add_image$shim + 2261323
1 (Missing) 0x2800 (Missing)
2 GTMSessionFetcher 0x9808c0 -[GTMSessionFetcher nextRetryInterval] + 3218 (GTMSessionFetcher.m:3218)
3 (Missing) 0x6e676953 (Missing)
4 (Missing) 0x33290000 (Missing)
5 (Missing) 0x46086142 (Missing)
@swift-ci
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swift-ci commented Apr 9, 2020

Comment by Tom Kraina (JIRA)

Related issue: https://bugs.swift.org/browse/SR-12511

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Comment by victor (JIRA)

I figure out the real reason.
After lots of work such as log and instruction debugging, I am surely it's a bug xcode 11.4 swift compiler optimization. Detailly, the optimization cause a stack pointer (fp) at the point opening a new function stack frame. I show it in the following.
Refer to this
https://stackoverflow.com/questions/61074507/app-crash-xcode11-4-ios-10-3-3-10-3-4-iphone-5c-5-ipad4-armv7s/61223586#61223586

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Comment by Tom Kraina (JIRA)

Filled a Feedback: FB7657583

@beccadax
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@swift-ci create

@mikeash
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mikeash commented Apr 23, 2020

This looks like an LLVM bug that's since been fixed. I believe Xcode 11.4.1 should have the fix. Please rebuild with that version and let us know if it still happens for you.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior.
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@mikeash @beccadax @swift-ci