Bug 188425
| Summary: | Frequent segfault with multithreaded fork | ||||||
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| Product: | Base System | Reporter: | Alex Crichton <acrichton> | ||||
| Component: | misc | Assignee: | freebsd-bugs (Nobody) <bugs> | ||||
| Status: | Open --- | ||||||
| Severity: | Affects Only Me | ||||||
| Priority: | Normal | ||||||
| Version: | 10.0-RELEASE | ||||||
| Hardware: | Any | ||||||
| OS: | Any | ||||||
| Attachments: |
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For bugs matching the following criteria: Status: In Progress Changed: (is less than) 2014-06-01 Reset to default assignee and clear in-progress tags. Mail being skipped |
Recently we've found that FreeBSD is segfaulting or hanging frequently when dealing with what we suspect is a multithreaded forking situation. I've written a small program (attached) which exhibits the bug. This program will segfault or trip an assertion in libthr frequently, but not always. Fix: Patch attached with submission follows: How-To-Repeat: 1. Download attached bug.c 2. clang -o bug bug.c -lthr 3. Run the program repeatedly until it segfaults, normally requiring less than 500 runs. When running the program, I've been using this script: for i in {1..1000}; do; echo $i; ./bug || break; done