* [PATCH] perf bpf: return value with unlocking in perf_env__find_btf()
@ 2019-04-22 8:01 Bo YU
2019-04-22 9:36 ` Jiri Olsa
0 siblings, 1 reply; 3+ messages in thread
From: Bo YU @ 2019-04-22 8:01 UTC (permalink / raw)
To: peterz, acme, alexander.shishkin, jolsa, namhyung, ast, daniel,
kafai, songliubraving, yhs, adrian.hunter
Cc: Bo YU, linux-kernel, netdev, bpf
In perf_env__find_btf(), returning without unlocking
"env->bpf_progs.lock". There may be cause lockdep issue.
DEtected by CoversityScan, CID# 1444762:(program hangs(LOCK))
Fixes: 2db7b1e0bd49d: (perf bpf: Return NULL when RB tree lookup fails in perf_env__find_btf())
Signed-off-by: Bo YU <tsu.yubo@gmail.com>
---
tools/perf/util/env.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
index 9494f9dc61ec..6a3eaf7d9353 100644
--- a/tools/perf/util/env.c
+++ b/tools/perf/util/env.c
@@ -115,8 +115,8 @@ struct btf_node *perf_env__find_btf(struct perf_env *env, __u32 btf_id)
}
node = NULL;
- up_read(&env->bpf_progs.lock);
out:
+ up_read(&env->bpf_progs.lock);
return node;
}
--
2.11.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] perf bpf: return value with unlocking in perf_env__find_btf()
2019-04-22 8:01 [PATCH] perf bpf: return value with unlocking in perf_env__find_btf() Bo YU
@ 2019-04-22 9:36 ` Jiri Olsa
2019-04-22 14:29 ` Arnaldo Carvalho de Melo
0 siblings, 1 reply; 3+ messages in thread
From: Jiri Olsa @ 2019-04-22 9:36 UTC (permalink / raw)
To: Bo YU
Cc: peterz, acme, alexander.shishkin, namhyung, ast, daniel, kafai,
songliubraving, yhs, adrian.hunter, linux-kernel, netdev, bpf
On Mon, Apr 22, 2019 at 04:01:38AM -0400, Bo YU wrote:
> In perf_env__find_btf(), returning without unlocking
> "env->bpf_progs.lock". There may be cause lockdep issue.
>
> DEtected by CoversityScan, CID# 1444762:(program hangs(LOCK))
>
> Fixes: 2db7b1e0bd49d: (perf bpf: Return NULL when RB tree lookup fails in perf_env__find_btf())
ugh, sry about that
Acked-by: Jiri Olsa <jolsa@kernel.org>
thanks,
jirka
> Signed-off-by: Bo YU <tsu.yubo@gmail.com>
> ---
> tools/perf/util/env.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
> index 9494f9dc61ec..6a3eaf7d9353 100644
> --- a/tools/perf/util/env.c
> +++ b/tools/perf/util/env.c
> @@ -115,8 +115,8 @@ struct btf_node *perf_env__find_btf(struct perf_env *env, __u32 btf_id)
> }
> node = NULL;
>
> - up_read(&env->bpf_progs.lock);
> out:
> + up_read(&env->bpf_progs.lock);
> return node;
> }
>
> --
> 2.11.0
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] perf bpf: return value with unlocking in perf_env__find_btf()
2019-04-22 9:36 ` Jiri Olsa
@ 2019-04-22 14:29 ` Arnaldo Carvalho de Melo
0 siblings, 0 replies; 3+ messages in thread
From: Arnaldo Carvalho de Melo @ 2019-04-22 14:29 UTC (permalink / raw)
To: Jiri Olsa
Cc: Bo YU, peterz, alexander.shishkin, namhyung, ast, daniel, kafai,
songliubraving, yhs, adrian.hunter, linux-kernel, netdev, bpf
Em Mon, Apr 22, 2019 at 11:36:29AM +0200, Jiri Olsa escreveu:
> On Mon, Apr 22, 2019 at 04:01:38AM -0400, Bo YU wrote:
> > In perf_env__find_btf(), returning without unlocking
> > "env->bpf_progs.lock". There may be cause lockdep issue.
> >
> > DEtected by CoversityScan, CID# 1444762:(program hangs(LOCK))
> >
> > Fixes: 2db7b1e0bd49d: (perf bpf: Return NULL when RB tree lookup fails in perf_env__find_btf())
>
> ugh, sry about that
Brown paper bag on the part of everybody involved indeed :-\
> Acked-by: Jiri Olsa <jolsa@kernel.org>
Applied.
Thanks,
- Arnaldo
> thanks,
> jirka
>
> > Signed-off-by: Bo YU <tsu.yubo@gmail.com>
> > ---
> > tools/perf/util/env.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
> > index 9494f9dc61ec..6a3eaf7d9353 100644
> > --- a/tools/perf/util/env.c
> > +++ b/tools/perf/util/env.c
> > @@ -115,8 +115,8 @@ struct btf_node *perf_env__find_btf(struct perf_env *env, __u32 btf_id)
> > }
> > node = NULL;
> >
> > - up_read(&env->bpf_progs.lock);
> > out:
> > + up_read(&env->bpf_progs.lock);
> > return node;
> > }
> >
> > --
> > 2.11.0
> >
--
- Arnaldo
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-04-22 8:01 [PATCH] perf bpf: return value with unlocking in perf_env__find_btf() Bo YU
2019-04-22 9:36 ` Jiri Olsa
2019-04-22 14:29 ` Arnaldo Carvalho de Melo
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