linux-kernel - Re: [PATCH] tracing: Fix missing errno when zero parser->idx in trace_pid

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Message-ID: <aMKHBwzgqHOhILUQ@xsang-OptiPlex-9020>
Date: Thu, 11 Sep 2025 16:23:35 +0800
From: Oliver Sang <oliver.sang@...el.com>
To: Steven Rostedt <rostedt@...dmis.org>
CC: Pu Lehui <pulehui@...weicloud.com>, <oe-lkp@...ts.linux.dev>,
	<lkp@...el.com>, <linux-kernel@...r.kernel.org>,
	<linux-trace-kernel@...r.kernel.org>, <mhiramat@...nel.org>,
	<mathieu.desnoyers@...icios.com>, <pulehui@...wei.com>,
	<oliver.sang@...el.com>
Subject: Re: [PATCH] tracing: Fix missing errno when zero parser->idx in
 trace_pid_write

hi, Steve,

On Fri, Sep 05, 2025 at 03:03:12PM -0400, Steven Rostedt wrote:
> On Tue, 2 Sep 2025 23:09:53 +0800
> kernel test robot <oliver.sang@...el.com> wrote:
> 
> > commit: cebdd2c9a622becc41349f32ace1795d750beda8 ("[PATCH] tracing: Fix missing errno when zero parser->idx in trace_pid_write")
> > url: https://github.com/intel-lab-lkp/linux/commits/Pu-Lehui/tracing-Fix-missing-errno-when-zero-parser-idx-in-trace_pid_write/20250821-151736
> > base: https://git.kernel.org/cgit/linux/kernel/git/trace/linux-trace for-next
> > patch link: https://lore.kernel.org/all/20250821071721.3609109-1-pulehui@huaweicloud.com/
> > patch subject: [PATCH] tracing: Fix missing errno when zero parser->idx in trace_pid_write
> > 
> > in testcase: perf-sanity-tests
> > version: 
> > with following parameters:
> > 
> > 	perf_compiler: gcc
> > 	group: group-01
> 
> This is why I hate LKP. It's huge, complex, and I never can get it working.
> 
> I did the following:
> 
>  # lkp split-job jobs/perf-sanity-tests.yaml
>  # lkp install -f ./perf-sanity-tests-defaults.yaml
> 
> [ had to fix python up a little because it wanted python3.9 where I had 3.13 ]
> 
>  # lkp run ./perf-sanity-tests-defaults.yaml
> /work/git/lkp-tests.git/programs/perf-sanity-tests/run: 7: .: cannot open /work/git/lkp-tests.git/lib/tests/perf_test.sh: No such file
> kill 37975 vmstat --timestamp -n 10 
> kill 37973 dmesg --follow --decode 
> wait for background processes: 37978 meminfo
> 
> 
> I have no idea where this "perf_test.sh" is supposed to come from, and why
> it doesn't exist :-p

sorry for inconvenience. for this "perf_test.sh" issue, we pushed a fix
https://github.com/intel/lkp-tests/commit/3ab6496813796e537d277242d220c4571790a363

however, we found there are other issues which block reproducer to work out of
our cluster env that we can not resolve shortly.

but if you have any debug/fix patch, we'll be very glad to test/verify.

> 
> 
> -- Steve