https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192918
Bug ID: 192918
Summary: [patch] A thread will spin if a signal interrupts
umtxq_sleep_pi.
Product: Base System
Version: 10.0-RELEASE
Hardware: amd64
OS: Any
Status: Needs Triage
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 146158
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=146158&action=edit
Test case
If a thread is blocked on a PI user mutex and receives a signal, do_lock_pi()
ignores (overwrites) the return value from umtxq_sleep_pi() and spins.
This was found on 10.0-RELEASE-p7, but the code is the same in head.
Attached are a test case and a patch against releng/10.0.
Thanks to: Elliott Rabe, Dell Inc.
Obtained from: Dell Inc.
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