Author: gibbs
Date: Wed Feb 20 17:55:17 2013
New Revision: 247049
URL: http://svnweb.freebsd.org/changeset/base/247049
Log:
Avoid panic when tearing down the DTrace pid provider for a
process that has crashed.
sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c:
In fasttrap_pid_disable(), we cannot PHOLD the proc
structure for a process that no longer exists, but
we still have other, fasttrap specific, state that
must be cleaned up for probes that existed in the
dead process. Instead of returning early if the
process related to our probes isn't found,
conditionalize the locking and carry on with a NULL
proc pointer. The rest of the fasttrap code already
understands that a NULL proc is possible and does
the right things in this case.
Sponsored by: Spectra Logic Corporation
Reviewed by: rpaulo, gnn
MFC after: 1 week
Modified:
head/sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c
Modified: head/sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c Wed Feb
20 17:46:38 2013 (r247048)
+++ head/sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c Wed Feb
20 17:55:17 2013 (r247049)
@@ -1124,14 +1124,12 @@ fasttrap_pid_disable(void *arg, dtrace_i
* provider lock as a point of mutual exclusion to prevent other
* DTrace consumers from disabling this probe.
*/
- if ((p = pfind(probe->ftp_pid)) == NULL) {
- mutex_exit(&provider->ftp_mtx);
- return;
- }
+ if ((p = pfind(probe->ftp_pid)) != NULL) {
#ifdef __FreeBSD__
- _PHOLD(p);
- PROC_UNLOCK(p);
+ _PHOLD(p);
+ PROC_UNLOCK(p);
#endif
+ }
/*
* Disable all the associated tracepoints (for fully enabled probes).
@@ -1168,7 +1166,8 @@ fasttrap_pid_disable(void *arg, dtrace_i
fasttrap_pid_cleanup();
#ifdef __FreeBSD__
- PRELE(p);
+ if (p != NULL)
+ PRELE(p);
#endif
if (!probe->ftp_enabled)
return;
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