linux-kernel - Re: [PATCH] perf callchain: Fix suspicious RCU usage in get_callchain

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Message-Id: <20260128062656.1860201-1-wangqing7171@gmail.com>
Date: Wed, 28 Jan 2026 14:26:56 +0800
From: Qing Wang <wangqing7171@...il.com>
To: andrii.nakryiko@...il.com
Cc: acme@...nel.org,
	adrian.hunter@...el.com,
	alexander.shishkin@...ux.intel.com,
	bpf@...r.kernel.org,
	irogers@...gle.com,
	jolsa@...nel.org,
	linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	mark.rutland@....com,
	mingo@...hat.com,
	namhyung@...nel.org,
	peterz@...radead.org,
	radoslaw.zielonek@...il.com,
	syzbot+72a43cdb78469f7fbad1@...kaller.appspotmail.com
Subject: Re: [PATCH] perf callchain: Fix suspicious RCU usage in get_callchain_entry()

On Fri, 19 Jul 2024 at 01:41, Andrii Nakryiko <andrii.nakryiko@...il.com> wrote:
> Which is what I'm doing in [0]. Radoslaw, can you please help
> validating if those changes are enough to fix this issue or we need to
> do some more?
> 
>   [0] https://patchwork.kernel.org/project/netdevbpf/patch/20240709204245.3=
> 847811-10-andrii@...nel.org/
> 
> >
> > > ---
> > >  kernel/events/callchain.c | 11 +++++++++--
> > >  1 file changed, 9 insertions(+), 2 deletions(-)
> > >

Hi,

I found this issue still exists after your patch in upstream and I have a
patch to fix it.

Patch here: https://lore.kernel.org/all/20260128061753.1857803-1-wangqing7171@gmail.com/T/

Looking forward to your review.

--
Best regards,
Qing