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[SR-9241] couldn't create pthread key for stdlib TLS: Resource temporarily unavailable #3593

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benlangmuir opened this issue Nov 14, 2018 · 3 comments
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[SR-9241] couldn't create pthread key for stdlib TLS: Resource temporarily unavailable #3593

benlangmuir opened this issue Nov 14, 2018 · 3 comments
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@benlangmuir
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Previous ID SR-9241
Radar None
Original Reporter @benlangmuir
Type Bug
Status Resolved
Resolution Done

Attachment: Download

Environment

Ubuntu 16.04, 18.04

I have seen this in Docker, a VM and physical machine. At one point it wasn't reproducing in docker, but now it seems to. Not sure what configuration difference there may be.

Additional Detail from JIRA
Votes 0
Component/s Foundation
Labels Bug
Assignee None
Priority Medium

md5: 261f81f07add698ef88fb90c3b278a2c

Issue Description:

When running SourceKit-LSP's tests on Ubuntu 16.04, I get a strange error:

Test Suite 'CodingTests' started at 2018-11-13 23:58:32.174
Test Case 'CodingTests.testValueCoding' started at 2018-11-13 23:58:32.174
couldn't create pthread key for stdlib TLS: Resource temporarily unavailable
 Aborted (core dumped)

I can reproduce the issue by running all the tests together like this:

$ .build/debug/SourceKitLSPPackageTests.xctest

But if I run each test separately they all pass:

$ for t in `.build/debug/SourceKitLSPPackageTests.xctest --list-tests`; do echo $t && .build/debug/SourceKitLSPPackageTests.xctest $t ; done
@benlangmuir
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Attached a backtrace; nothing jumps out at me. There are 34 threads , but all others are idle.

@benlangmuir
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It looks like we're calling `pthread_key_create` more than `PTHREAD_KEYS_MAX=1024` times. Of that, CoreFoundation makes 1033 calls that look like this:

_CFGetTSDCreateIfNeeded
  __CFTSDInitialize
    pthread_key_create

I found this in lldb:

(lldb) breakpoint list
Current breakpoints:
1: name = 'pthread_key_create', locations = 1, resolved = 1, hit count = 1035 Options: enabled auto-continue 
  1.1: where = libpthread.so.0`__GI___pthread_key_create, address = 0x00007ffff6b31f90, resolved, hit count = 1035 

3: address = libFoundation.so[0x000000000084dc82], locations = 1, resolved = 1, hit count = 1031 Options: enabled auto-continue 
  3.1: where = libFoundation.so`_CFGetTSDCreateIfNeeded + 82, address = 0x00007ffff7a9dc82, resolved, hit count = 1031

(lldb) disas -a 0x00007ffff7a9dc82
<snip>
    0x7ffff7a9dc74 <+68>:  leaq   0x333bfd(%rip), %rdi      ; __CFTSDIndexKey
    0x7ffff7a9dc7b <+75>:  leaq   -0x112(%rip), %rsi        ; __CFTSDFinalize
    0x7ffff7a9dc82 <+82>:  callq  0x7ffff74b4060            ; symbol stub for: pthread_key_create

@benlangmuir
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#1790

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@shahmishal shahmishal transferred this issue from apple/swift May 5, 2022
This issue was closed.
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@benlangmuir