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author | Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> | 2011-10-04 19:44:38 +0900 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-11 09:43:13 -0800 |
commit | 16fd0c4105bb27e0050ce4a5d948408f7369ad63 (patch) | |
tree | 911dad7f64dd9d820d354c30b535e1428a368b4f /samples/Kconfig | |
parent | fa73b411b41b050e212a20fc33ab45f2eb781c24 (diff) |
ftrace/kprobes: Fix not to delete probes if in use
commit 02ca1521ad404cf566e0075848f80d064c0a0503 upstream.
Fix kprobe-tracer not to delete a probe if the probe is in use.
In that case, delete operation will return -EBUSY.
This bug can cause a kernel panic if enabled probes are deleted
during perf record.
(Add some probes on functions)
sh-4.2# perf probe --del probe:\*
sh-4.2# exit
(kernel panic)
This is originally reported on the fedora bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=742383
I've also checked that this problem doesn't happen on
tracepoints when module removing because perf event
locks target module.
$ sudo ./perf record -e xfs:\* -aR sh
sh-4.2# rmmod xfs
ERROR: Module xfs is in use
sh-4.2# exit
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.203 MB perf.data (~8862 samples) ]
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Frank Ch. Eigler <fche@redhat.com>
Link: http://lkml.kernel.org/r/20111004104438.14591.6553.stgit@fedora15
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'samples/Kconfig')
0 files changed, 0 insertions, 0 deletions