* [PATCH] perf tools: Fix segfault in 'perf top'
@ 2015-09-11 4:59 Wang Nan
2015-09-11 16:22 ` Namhyung Kim
0 siblings, 1 reply; 7+ messages in thread
From: Wang Nan @ 2015-09-11 4:59 UTC (permalink / raw)
To: acme; +Cc: lizefan, linux-kernel, pi3orama, Wang Nan, Namhyung Kim
'perf top' segfaults with following operation:
# perf top -e page-faults -p 15173 # 15173 never generate page-fault
Then on the resulting empty interface, press right key:
# ./perf top -e page-faults -p 11400
perf: Segmentation fault
-------- backtrace --------
./perf[0x535428]
/lib64/libc.so.6(+0x3545f)[0x7f0dd360745f]
./perf[0x531d46]
./perf(perf_evlist__tui_browse_hists+0x96)[0x5340d6]
./perf[0x44ba2f]
/lib64/libpthread.so.0(+0x81d0)[0x7f0dd49dc1d0]
/lib64/libc.so.6(clone+0x6c)[0x7f0dd36b90dc]
The bug reside in perf_evsel__hists_browse() that, in the above circumstance
browser->selection can be NULL, but code after skip_annotation doesn't consider
it.
This patch fix it by checing browser->selection before fetching
browser->selection->map and browser->selection->sym.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/ui/browsers/hists.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index e4fd40f..b00fa92 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -2017,7 +2017,8 @@ skip_annotation:
&options[nr_options], dso);
nr_options += add_map_opt(browser, &actions[nr_options],
&options[nr_options],
- browser->selection->map);
+ browser->selection ?
+ browser->selection->map : NULL);
nr_options += add_socket_opt(browser, &actions[nr_options],
&options[nr_options],
socket);
@@ -2030,7 +2031,10 @@ skip_annotation:
nr_options += add_script_opt(browser,
&actions[nr_options],
&options[nr_options],
- NULL, browser->selection->sym);
+ NULL,
+ browser->selection ?
+ browser->selection->sym :
+ NULL);
}
nr_options += add_script_opt(browser, &actions[nr_options],
&options[nr_options], NULL, NULL);
--
1.8.3.4
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH] perf tools: Fix segfault in 'perf top'
2015-09-11 4:59 [PATCH] perf tools: Fix segfault in 'perf top' Wang Nan
@ 2015-09-11 16:22 ` Namhyung Kim
2015-09-14 10:15 ` Wangnan (F)
2015-09-14 10:23 ` [PATCH v2] " Wang Nan
0 siblings, 2 replies; 7+ messages in thread
From: Namhyung Kim @ 2015-09-11 16:22 UTC (permalink / raw)
To: Wang Nan; +Cc: acme, lizefan, linux-kernel, pi3orama
On Fri, Sep 11, 2015 at 04:59:11AM +0000, Wang Nan wrote:
> 'perf top' segfaults with following operation:
>
> # perf top -e page-faults -p 15173 # 15173 never generate page-fault
>
> Then on the resulting empty interface, press right key:
>
> # ./perf top -e page-faults -p 11400
> perf: Segmentation fault
> -------- backtrace --------
> ./perf[0x535428]
> /lib64/libc.so.6(+0x3545f)[0x7f0dd360745f]
> ./perf[0x531d46]
> ./perf(perf_evlist__tui_browse_hists+0x96)[0x5340d6]
> ./perf[0x44ba2f]
> /lib64/libpthread.so.0(+0x81d0)[0x7f0dd49dc1d0]
> /lib64/libc.so.6(clone+0x6c)[0x7f0dd36b90dc]
>
> The bug reside in perf_evsel__hists_browse() that, in the above circumstance
> browser->selection can be NULL, but code after skip_annotation doesn't consider
> it.
>
> This patch fix it by checing browser->selection before fetching
> browser->selection->map and browser->selection->sym.
I'm ok with this change, just a nitpick below..
>
> Signed-off-by: Wang Nan <wangnan0@huawei.com>
> Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
> Cc: Namhyung Kim <namhyung@kernel.org>
> ---
> tools/perf/ui/browsers/hists.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
> index e4fd40f..b00fa92 100644
> --- a/tools/perf/ui/browsers/hists.c
> +++ b/tools/perf/ui/browsers/hists.c
> @@ -2017,7 +2017,8 @@ skip_annotation:
> &options[nr_options], dso);
> nr_options += add_map_opt(browser, &actions[nr_options],
> &options[nr_options],
> - browser->selection->map);
> + browser->selection ?
> + browser->selection->map : NULL);
> nr_options += add_socket_opt(browser, &actions[nr_options],
> &options[nr_options],
> socket);
> @@ -2030,7 +2031,10 @@ skip_annotation:
> nr_options += add_script_opt(browser,
> &actions[nr_options],
> &options[nr_options],
> - NULL, browser->selection->sym);
> + NULL,
> + browser->selection ?
> + browser->selection->sym :
> + NULL);
Is this really needed? IIUC browser->selection is not NULL if
browser->he_selection is not NULL. Did you see a case it's NULL?
Also passing a NULL thread and a NULL sym is meaningless here since
it's a duplication..
Thanks,
Namhyung
> }
> nr_options += add_script_opt(browser, &actions[nr_options],
> &options[nr_options], NULL, NULL);
> --
> 1.8.3.4
>
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] perf tools: Fix segfault in 'perf top'
2015-09-11 16:22 ` Namhyung Kim
@ 2015-09-14 10:15 ` Wangnan (F)
2015-09-14 10:23 ` [PATCH v2] " Wang Nan
1 sibling, 0 replies; 7+ messages in thread
From: Wangnan (F) @ 2015-09-14 10:15 UTC (permalink / raw)
To: Namhyung Kim; +Cc: acme, lizefan, linux-kernel, pi3orama
On 2015/9/12 0:22, Namhyung Kim wrote:
> On Fri, Sep 11, 2015 at 04:59:11AM +0000, Wang Nan wrote:
>> 'perf top' segfaults with following operation:
>>
>> # perf top -e page-faults -p 15173 # 15173 never generate page-fault
>>
>> Then on the resulting empty interface, press right key:
>>
>> # ./perf top -e page-faults -p 11400
>> perf: Segmentation fault
>> -------- backtrace --------
>> ./perf[0x535428]
>> /lib64/libc.so.6(+0x3545f)[0x7f0dd360745f]
>> ./perf[0x531d46]
>> ./perf(perf_evlist__tui_browse_hists+0x96)[0x5340d6]
>> ./perf[0x44ba2f]
>> /lib64/libpthread.so.0(+0x81d0)[0x7f0dd49dc1d0]
>> /lib64/libc.so.6(clone+0x6c)[0x7f0dd36b90dc]
>>
>> The bug reside in perf_evsel__hists_browse() that, in the above circumstance
>> browser->selection can be NULL, but code after skip_annotation doesn't consider
>> it.
>>
>> This patch fix it by checing browser->selection before fetching
>> browser->selection->map and browser->selection->sym.
> I'm ok with this change, just a nitpick below..
>
>
>> Signed-off-by: Wang Nan <wangnan0@huawei.com>
>> Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
>> Cc: Namhyung Kim <namhyung@kernel.org>
>> ---
>> tools/perf/ui/browsers/hists.c | 8 ++++++--
>> 1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
>> index e4fd40f..b00fa92 100644
>> --- a/tools/perf/ui/browsers/hists.c
>> +++ b/tools/perf/ui/browsers/hists.c
>> @@ -2017,7 +2017,8 @@ skip_annotation:
>> &options[nr_options], dso);
>> nr_options += add_map_opt(browser, &actions[nr_options],
>> &options[nr_options],
>> - browser->selection->map);
>> + browser->selection ?
>> + browser->selection->map : NULL);
>> nr_options += add_socket_opt(browser, &actions[nr_options],
>> &options[nr_options],
>> socket);
>> @@ -2030,7 +2031,10 @@ skip_annotation:
>> nr_options += add_script_opt(browser,
>> &actions[nr_options],
>> &options[nr_options],
>> - NULL, browser->selection->sym);
>> + NULL,
>> + browser->selection ?
>> + browser->selection->sym :
>> + NULL);
> Is this really needed? IIUC browser->selection is not NULL if
> browser->he_selection is not NULL. Did you see a case it's NULL?
> Also passing a NULL thread and a NULL sym is meaningless here since
> it's a duplication..
Actually I didn't see the case when browser->he_selection is not NULL but
browser->selection is NULL. I add the testing only for safety reason because
we have
if (browser->selection == NULL)
goto skip_annotation;
So I guess we'd better to check browser->selection in the codeblock
leading by
skip_annotation, so if someone breaks the assumption the code still work.
But yes, we can add the checker back when the assumption *does* be broken.
Currently let's add a comment here for code readers.
Please have a look for v2 patch.
Thank you.
> Thanks,
> Namhyung
>
>
>> }
>> nr_options += add_script_opt(browser, &actions[nr_options],
>> &options[nr_options], NULL, NULL);
>> --
>> 1.8.3.4
>>
^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH v2] perf tools: Fix segfault in 'perf top'
2015-09-11 16:22 ` Namhyung Kim
2015-09-14 10:15 ` Wangnan (F)
@ 2015-09-14 10:23 ` Wang Nan
2015-09-14 18:07 ` Arnaldo Carvalho de Melo
2015-09-16 7:27 ` [tip:perf/core] perf top: Fix segfault pressing -> with no hist entries tip-bot for Wang Nan
1 sibling, 2 replies; 7+ messages in thread
From: Wang Nan @ 2015-09-14 10:23 UTC (permalink / raw)
To: acme, namhyung; +Cc: linux-kernel, lizefan, pi3orama, Wang Nan
'perf top' segfaults with following operation:
# perf top -e page-faults -p 11400 # 11400 never generates page-fault
Then on the resulting empty interface, press right key:
# ./perf top -e page-faults -p 11400
perf: Segmentation fault
-------- backtrace --------
./perf[0x535428]
/lib64/libc.so.6(+0x3545f)[0x7f0dd360745f]
./perf[0x531d46]
./perf(perf_evlist__tui_browse_hists+0x96)[0x5340d6]
./perf[0x44ba2f]
/lib64/libpthread.so.0(+0x81d0)[0x7f0dd49dc1d0]
/lib64/libc.so.6(clone+0x6c)[0x7f0dd36b90dc]
The bug reside in perf_evsel__hists_browse() that, in the above circumstance
browser->selection can be NULL, but code after skip_annotation doesn't consider
it.
This patch fix it by checking browser->selection before fetching
browser->selection->map.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/ui/browsers/hists.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index e4fd40f..182b87a 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -2017,7 +2017,8 @@ skip_annotation:
&options[nr_options], dso);
nr_options += add_map_opt(browser, &actions[nr_options],
&options[nr_options],
- browser->selection->map);
+ browser->selection ?
+ browser->selection->map : NULL);
nr_options += add_socket_opt(browser, &actions[nr_options],
&options[nr_options],
socket);
@@ -2027,6 +2028,15 @@ skip_annotation:
&actions[nr_options],
&options[nr_options],
thread, NULL);
+ /*
+ * Note that browser->selection != NULL
+ * when browser->he_selection is not NULL,
+ * so we don't need to check browser->selection
+ * before fetching browser->selection->sym like what
+ * we do before fetching browser->selection->map.
+ *
+ * See hist_browser__show_entry.
+ */
nr_options += add_script_opt(browser,
&actions[nr_options],
&options[nr_options],
--
1.8.3.4
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH v2] perf tools: Fix segfault in 'perf top'
2015-09-14 10:23 ` [PATCH v2] " Wang Nan
@ 2015-09-14 18:07 ` Arnaldo Carvalho de Melo
2015-09-14 18:12 ` Arnaldo Carvalho de Melo
2015-09-16 7:27 ` [tip:perf/core] perf top: Fix segfault pressing -> with no hist entries tip-bot for Wang Nan
1 sibling, 1 reply; 7+ messages in thread
From: Arnaldo Carvalho de Melo @ 2015-09-14 18:07 UTC (permalink / raw)
To: Wang Nan; +Cc: namhyung, linux-kernel, lizefan, pi3orama
Em Mon, Sep 14, 2015 at 10:23:55AM +0000, Wang Nan escreveu:
> 'perf top' segfaults with following operation:
>
> # perf top -e page-faults -p 11400 # 11400 never generates page-fault
>
> Then on the resulting empty interface, press right key:
So, this happens in perf/urgent, so we need to apply it there first,
which this patch doesn't.
I am fixing it up this time, thanks for the patch!
- Arnaldo
> # ./perf top -e page-faults -p 11400
> perf: Segmentation fault
> -------- backtrace --------
> ./perf[0x535428]
> /lib64/libc.so.6(+0x3545f)[0x7f0dd360745f]
> ./perf[0x531d46]
> ./perf(perf_evlist__tui_browse_hists+0x96)[0x5340d6]
> ./perf[0x44ba2f]
> /lib64/libpthread.so.0(+0x81d0)[0x7f0dd49dc1d0]
> /lib64/libc.so.6(clone+0x6c)[0x7f0dd36b90dc]
>
> The bug reside in perf_evsel__hists_browse() that, in the above circumstance
> browser->selection can be NULL, but code after skip_annotation doesn't consider
> it.
>
> This patch fix it by checking browser->selection before fetching
> browser->selection->map.
>
> Signed-off-by: Wang Nan <wangnan0@huawei.com>
> Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
> Cc: Namhyung Kim <namhyung@kernel.org>
> ---
> tools/perf/ui/browsers/hists.c | 12 +++++++++++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
> index e4fd40f..182b87a 100644
> --- a/tools/perf/ui/browsers/hists.c
> +++ b/tools/perf/ui/browsers/hists.c
> @@ -2017,7 +2017,8 @@ skip_annotation:
> &options[nr_options], dso);
> nr_options += add_map_opt(browser, &actions[nr_options],
> &options[nr_options],
> - browser->selection->map);
> + browser->selection ?
> + browser->selection->map : NULL);
> nr_options += add_socket_opt(browser, &actions[nr_options],
> &options[nr_options],
> socket);
> @@ -2027,6 +2028,15 @@ skip_annotation:
> &actions[nr_options],
> &options[nr_options],
> thread, NULL);
> + /*
> + * Note that browser->selection != NULL
> + * when browser->he_selection is not NULL,
> + * so we don't need to check browser->selection
> + * before fetching browser->selection->sym like what
> + * we do before fetching browser->selection->map.
> + *
> + * See hist_browser__show_entry.
> + */
> nr_options += add_script_opt(browser,
> &actions[nr_options],
> &options[nr_options],
> --
> 1.8.3.4
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH v2] perf tools: Fix segfault in 'perf top'
2015-09-14 18:07 ` Arnaldo Carvalho de Melo
@ 2015-09-14 18:12 ` Arnaldo Carvalho de Melo
0 siblings, 0 replies; 7+ messages in thread
From: Arnaldo Carvalho de Melo @ 2015-09-14 18:12 UTC (permalink / raw)
To: Wang Nan; +Cc: namhyung, linux-kernel, lizefan, pi3orama
Em Mon, Sep 14, 2015 at 03:07:14PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Sep 14, 2015 at 10:23:55AM +0000, Wang Nan escreveu:
> > 'perf top' segfaults with following operation:
> >
> > # perf top -e page-faults -p 11400 # 11400 never generates page-fault
> >
> > Then on the resulting empty interface, press right key:
>
> So, this happens in perf/urgent, so we need to apply it there first,
> which this patch doesn't.
>
> I am fixing it up this time, thanks for the patch!
For reference, below is the resulting patch, pushed to acme/perf/urgent,
now checking if there are more patches to go together with this one...
- Arnaldo
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index cf86f2d3a5e7..c04c60d4863c 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -1968,7 +1968,8 @@ skip_annotation:
&options[nr_options], dso);
nr_options += add_map_opt(browser, &actions[nr_options],
&options[nr_options],
- browser->selection->map);
+ browser->selection ?
+ browser->selection->map : NULL);
/* perf script support */
if (browser->he_selection) {
@@ -1976,6 +1977,15 @@ skip_annotation:
&actions[nr_options],
&options[nr_options],
thread, NULL);
+ /*
+ * Note that browser->selection != NULL
+ * when browser->he_selection is not NULL,
+ * so we don't need to check browser->selection
+ * before fetching browser->selection->sym like what
+ * we do before fetching browser->selection->map.
+ *
+ * See hist_browser__show_entry.
+ */
nr_options += add_script_opt(browser,
&actions[nr_options],
&options[nr_options],
^ permalink raw reply related [flat|nested] 7+ messages in thread
* [tip:perf/core] perf top: Fix segfault pressing -> with no hist entries
2015-09-14 10:23 ` [PATCH v2] " Wang Nan
2015-09-14 18:07 ` Arnaldo Carvalho de Melo
@ 2015-09-16 7:27 ` tip-bot for Wang Nan
1 sibling, 0 replies; 7+ messages in thread
From: tip-bot for Wang Nan @ 2015-09-16 7:27 UTC (permalink / raw)
To: linux-tip-commits
Cc: tglx, hpa, lizefan, acme, linux-kernel, wangnan0, mingo, namhyung
Commit-ID: bd315aab8a3ab1bc7074774b89a5d8ec7c1ff7ab
Gitweb: http://git.kernel.org/tip/bd315aab8a3ab1bc7074774b89a5d8ec7c1ff7ab
Author: Wang Nan <wangnan0@huawei.com>
AuthorDate: Mon, 14 Sep 2015 10:23:55 +0000
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 14 Sep 2015 15:10:41 -0300
perf top: Fix segfault pressing -> with no hist entries
'perf top' segfaults with following operation:
# perf top -e page-faults -p 11400 # 11400 never generates page-fault
Then on the resulting empty interface, press right key:
# ./perf top -e page-faults -p 11400
perf: Segmentation fault
-------- backtrace --------
./perf[0x535428]
/lib64/libc.so.6(+0x3545f)[0x7f0dd360745f]
./perf[0x531d46]
./perf(perf_evlist__tui_browse_hists+0x96)[0x5340d6]
./perf[0x44ba2f]
/lib64/libpthread.so.0(+0x81d0)[0x7f0dd49dc1d0]
/lib64/libc.so.6(clone+0x6c)[0x7f0dd36b90dc]
The bug resides in perf_evsel__hists_browse() that, in the above
circumstance browser->selection can be NULL, but code after
skip_annotation doesn't consider it.
This patch fix it by checking browser->selection before fetching
browser->selection->map.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1442226235-117265-1-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/ui/browsers/hists.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index cf86f2d..c04c60d 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -1968,7 +1968,8 @@ skip_annotation:
&options[nr_options], dso);
nr_options += add_map_opt(browser, &actions[nr_options],
&options[nr_options],
- browser->selection->map);
+ browser->selection ?
+ browser->selection->map : NULL);
/* perf script support */
if (browser->he_selection) {
@@ -1976,6 +1977,15 @@ skip_annotation:
&actions[nr_options],
&options[nr_options],
thread, NULL);
+ /*
+ * Note that browser->selection != NULL
+ * when browser->he_selection is not NULL,
+ * so we don't need to check browser->selection
+ * before fetching browser->selection->sym like what
+ * we do before fetching browser->selection->map.
+ *
+ * See hist_browser__show_entry.
+ */
nr_options += add_script_opt(browser,
&actions[nr_options],
&options[nr_options],
^ permalink raw reply related [flat|nested] 7+ messages in thread
end of thread, other threads:[~2015-09-16 7:28 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2015-09-11 4:59 [PATCH] perf tools: Fix segfault in 'perf top' Wang Nan
2015-09-11 16:22 ` Namhyung Kim
2015-09-14 10:15 ` Wangnan (F)
2015-09-14 10:23 ` [PATCH v2] " Wang Nan
2015-09-14 18:07 ` Arnaldo Carvalho de Melo
2015-09-14 18:12 ` Arnaldo Carvalho de Melo
2015-09-16 7:27 ` [tip:perf/core] perf top: Fix segfault pressing -> with no hist entries tip-bot for Wang Nan
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