Date: Wed, 28 Mar 2001 08:11:52 -0800 (PST) From: John Baldwin <jhb@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/kern subr_witness.c Message-ID: <200103281611.f2SGBq521407@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
jhb 2001/03/28 08:11:52 PST
Modified files:
sys/kern subr_witness.c
Log:
Close a race condition where if we were obtaining a sleep lock and no spin
locks were held, we could be preempted and switch CPU's in between the time
that we set a variable to the list of spin locks on our CPU and the time
that we checked that variable to ensure no spinlocks were held while
grabbing a sleep lock. Losing the race resulted in checking some other
CPU's spin lock list and bogusly panicing.
Revision Changes Path
1.61 +15 -2 src/sys/kern/subr_witness.c
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe cvs-all" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200103281611.f2SGBq521407>