diff options
| author | Adrian Hunter <adrian.hunter@intel.com> | 2016-04-18 13:57:48 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-05-05 00:48:47 +0300 |
| commit | 0ea82073cb5e7039299350aba5bc135994c8cbda (patch) | |
| tree | 1adb7e3fa75540398a21fc025c7b3bf8eed83e36 /tools | |
| parent | f4276d5753538996fa93a34646554bfd92f6e071 (diff) | |
| download | linux-0ea82073cb5e7039299350aba5bc135994c8cbda.tar.xz | |
perf intel-pt: Fix segfault tracing transactions
commit 1342e0b7a6c1a060c593037fbac9f4b717f1cb3b upstream.
Tracing a workload that uses transactions gave a seg fault as follows:
perf record -e intel_pt// workload
perf report
Program received signal SIGSEGV, Segmentation fault.
0x000000000054b58c in intel_pt_reset_last_branch_rb (ptq=0x1a36110)
at util/intel-pt.c:929
929 ptq->last_branch_rb->nr = 0;
(gdb) p ptq->last_branch_rb
$1 = (struct branch_stack *) 0x0
(gdb) up
1148 intel_pt_reset_last_branch_rb(ptq);
(gdb) l
1143 if (ret)
1144 pr_err("Intel Processor Trace: failed to deliver transaction event
1145 ret);
1146
1147 if (pt->synth_opts.callchain)
1148 intel_pt_reset_last_branch_rb(ptq);
1149
1150 return ret;
1151 }
1152
(gdb) p pt->synth_opts.callchain
$2 = true
(gdb)
(gdb) bt
#0 0x000000000054b58c in intel_pt_reset_last_branch_rb (ptq=0x1a36110)
#1 0x000000000054c1e0 in intel_pt_synth_transaction_sample (ptq=0x1a36110)
#2 0x000000000054c5b2 in intel_pt_sample (ptq=0x1a36110)
Caused by checking the 'callchain' flag when it should have been the
'last_branch' flag. Fix that.
Reported-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Fixes: f14445ee72c5 ("perf intel-pt: Support generating branch stack")
Link: http://lkml.kernel.org/r/1460977068-11566-1-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/util/intel-pt.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c index 97f963a3dcb9..9227c2f076c3 100644 --- a/tools/perf/util/intel-pt.c +++ b/tools/perf/util/intel-pt.c @@ -1127,7 +1127,7 @@ static int intel_pt_synth_transaction_sample(struct intel_pt_queue *ptq) pr_err("Intel Processor Trace: failed to deliver transaction event, error %d\n", ret); - if (pt->synth_opts.callchain) + if (pt->synth_opts.last_branch) intel_pt_reset_last_branch_rb(ptq); return ret; |