Author: rpaulo
Date: Sun Aug 11 00:57:01 2013
New Revision: 254198
URL: http://svnweb.freebsd.org/changeset/base/254198
Log:
fasttrap_fork(): unlock the processes before removing the tracepoints.
In the future, we'll need to come up with new proc_*() functions that accept
locked processes. For now, this prevents postgresql + DTrace from crashing the
system.
MFC after: 1 month
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 Sat Aug
10 23:17:09 2013 (r254197)
+++ head/sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c Sun Aug
11 00:57:01 2013 (r254198)
@@ -502,7 +502,13 @@ fasttrap_fork(proc_t *p, proc_t *cp)
sprlock_proc(cp);
mtx_unlock_spin(&cp->p_slock);
#else
+ /*
+ * fasttrap_tracepoint_remove() expects the child process to be
+ * unlocked and the VM then expects curproc to be unlocked.
+ */
_PHOLD(cp);
+ PROC_UNLOCK(cp);
+ PROC_UNLOCK(p);
#endif
/*
@@ -537,6 +543,8 @@ fasttrap_fork(proc_t *p, proc_t *cp)
mutex_enter(&cp->p_lock);
sprunlock(cp);
#else
+ PROC_LOCK(p);
+ PROC_LOCK(cp);
_PRELE(cp);
#endif
}
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