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Date: Tue, 17 Oct 2017 22:29:00 +0900
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Jiri Olsa <jolsa@...nel.org>,
LKML <linux-kernel@...r.kernel.org>, kernel-team@....com,
Thomas-Mich Richter <tmricht@...ux.vnet.ibm.com>,
"linux-perf-use." <linux-perf-users@...r.kernel.org>,
Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
Subject: [PATCH] perf tools: Fix crash on buildid-list with namespace
Thomas reported that perf buildid-list gets a segfault due to NULL
pointer when he ran it on a data with namespace events. It was because
the buildid_id__mark_dso_hit_ops lacks the namespace event handler and
perf_too__fill_default() didn't set it.
Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
Missing separate debuginfos, use: dnf debuginfo-install audit-libs-2.7.7-1.fc25.s390x bzip2-libs-1.0.6-21.fc25.s390x elfutils-libelf-0.169-1.fc25.s390x
+elfutils-libs-0.169-1.fc25.s390x libcap-ng-0.7.8-1.fc25.s390x numactl-libs-2.0.11-2.ibm.fc25.s390x openssl-libs-1.1.0e-1.1.ibm.fc25.s390x perl-libs-5.24.1-386.fc25.s390x
+python-libs-2.7.13-2.fc25.s390x slang-2.3.0-7.fc25.s390x xz-libs-5.2.3-2.fc25.s390x zlib-1.2.8-10.fc25.s390x
(gdb) where
#0 0x0000000000000000 in ?? ()
#1 0x00000000010fad6a in machines__deliver_event (machines=<optimized out>, machines@...ry=0x2c6fd18,
evlist=<optimized out>, event=event@...ry=0x3fffdf00470, sample=0x3ffffffe880, sample@...ry=0x3ffffffe888,
tool=tool@...ry=0x1312968 <build_id.mark_dso_hit_ops>, file_offset=1136) at util/session.c:1287
#2 0x00000000010fbf4e in perf_session__deliver_event (file_offset=1136, tool=0x1312968 <build_id.mark_dso_hit_ops>,
sample=0x3ffffffe888, event=0x3fffdf00470, session=0x2c6fc30) at util/session.c:1340
#3 perf_session__process_event (session=0x2c6fc30, session@...ry=0x0, event=event@...ry=0x3fffdf00470,
file_offset=file_offset@...ry=1136) at util/session.c:1522
#4 0x00000000010fddde in __perf_session__process_events (file_size=11880, data_size=<optimized out>,
data_offset=<optimized out>, session=0x0) at util/session.c:1899
#5 perf_session__process_events (session=0x0, session@...ry=0x2c6fc30) at util/session.c:1953
#6 0x000000000103b2ac in perf_session__list_build_ids (with_hits=<optimized out>, force=<optimized out>)
at builtin-buildid-list.c:83
#7 cmd_buildid_list (argc=<optimized out>, argv=<optimized out>) at builtin-buildid-list.c:115
#8 0x00000000010a026c in run_builtin (p=0x1311f78 <commands+24>, argc=argc@...ry=2, argv=argv@...ry=0x3fffffff3c0)
at perf.c:296
#9 0x000000000102bc00 in handle_internal_command (argv=<optimized out>, argc=2) at perf.c:348
#10 run_argv (argcp=<synthetic pointer>, argv=<synthetic pointer>) at perf.c:392
#11 main (argc=<optimized out>, argv=0x3fffffff3c0) at perf.c:536
(gdb)
Fix it by adding a stub event handler for namespace event.
Reported-and-Tested-by: Thomas-Mich Richter <tmricht@...ux.vnet.ibm.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
tools/perf/util/session.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index a7ebd9fe8e40..76ab0709a20c 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -374,6 +374,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
tool->mmap2 = process_event_stub;
if (tool->comm == NULL)
tool->comm = process_event_stub;
+ if (tool->namespaces == NULL)
+ tool->namespaces = process_event_stub;
if (tool->fork == NULL)
tool->fork = process_event_stub;
if (tool->exit == NULL)
--
2.14.2
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