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Another NFS SIGSTOP related fix: Ignore thread suspend requests due to

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SIGSTOP if stop signals are currently deferred.  This can occur if a
process is stopped via SIGSTOP while a thread is running or runnable
but before it has set TDF_SBDRY.

Tested by:	pho
Reviewed by:	kib
MFC after:	1 week
This commit is contained in:
John Baldwin 2013-03-21 14:06:27 +00:00
parent c46262f810
commit d071a6fa33
1 changed files with 11 additions and 0 deletions
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11
sys/kern/kern_thread.c
View file

@ -794,6 +794,17 @@ thread_suspend_check(int return_instead)
(p->p_flag & P_SINGLE_BOUNDARY) && return_instead)
return (ERESTART);
/*
* Ignore suspend requests for stop signals if they
* are deferred.
*/
if (P_SHOULDSTOP(p) == P_STOPPED_SIG &&
td->td_flags & TDF_SBDRY) {
KASSERT(return_instead,
("TDF_SBDRY set for unsafe thread_suspend_check"));
return (0);
}
/*
* If the process is waiting for us to exit,
* this thread should just suicide.