linux-kernel - Re: [GIT PULL v2] tracing: Updates for v6.14

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Message-ID: <20250121124102.12a25936@gandalf.local.home>
Date: Tue, 21 Jan 2025 12:41:02 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Sasha Levin <sashal@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>, LKML
 <linux-kernel@...r.kernel.org>, Masami Hiramatsu <mhiramat@...nel.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Alice Ryhl
 <aliceryhl@...gle.com>
Subject: Re: [GIT PULL v2] tracing: Updates for v6.14

On Tue, 21 Jan 2025 11:41:00 -0500
Sasha Levin <sashal@...nel.org> wrote:

> Hey Steve,
> 
> I've started seeing memory corruption issues in LKFT, such as the one
> here: https://qa-reports.linaro.org/lkft/sashal-linus-next/build/v6.13-rc7-790-gabac258eb0d1/testrun/26834686/suite/log-parser-test/test/bug-bug-kernel-null-pointer-dereference-address/log
> 
> I ran a bisection, which led me to the below commit:
> 
> On Tue, Jan 21, 2025 at 10:15:51AM -0500, Steven Rostedt wrote:
> >      tracing: Cache ":mod:" events for modules not loaded yet  
> 
> I've also confirmed that reverting this commit on top of linus-next fixes
> the issue.

Do you have the .config for this? Did you have CONFIG_MODULES set? If not, the bug with:

 #if CONFIG_MODULES

still is true and the code paths there can cause memory corruption. Which
would be fixed by the new patches added in this version of the pull request.

-- Steve