Author: kib
Date: Fri Dec 30 20:21:53 2011
New Revision: 229021
URL: http://svn.freebsd.org/changeset/base/229021
Log:
MFC r227393:
Lock the thread lock around block that retrieves td_wmesg. Otherwise,
procfs could see a thread with assigned td_wchan but still NULL td_wmesg.
Modified:
stable/9/sys/fs/procfs/procfs_status.c
Directory Properties:
stable/9/sys/ (props changed)
Modified: stable/9/sys/fs/procfs/procfs_status.c
==============================================================================
--- stable/9/sys/fs/procfs/procfs_status.c Fri Dec 30 20:12:50 2011
(r229020)
+++ stable/9/sys/fs/procfs/procfs_status.c Fri Dec 30 20:21:53 2011
(r229021)
@@ -113,12 +113,14 @@ procfs_doprocstatus(PFS_FILL_ARGS)
}
tdfirst = FIRST_THREAD_IN_PROC(p);
+ thread_lock(tdfirst);
if (tdfirst->td_wchan != NULL) {
KASSERT(tdfirst->td_wmesg != NULL,
("wchan %p has no wmesg", tdfirst->td_wchan));
wmesg = tdfirst->td_wmesg;
} else
wmesg = "nochan";
+ thread_unlock(tdfirst);
if (p->p_flag & P_INMEM) {
struct timeval start, ut, st;
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