linux-kernel - Re: [REGRESSION] module BTF validation failure (Error -22) on next

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Message-ID: <Z1GBXHM1M4-Ws9Br@krava>
Date: Thu, 5 Dec 2024 11:33:00 +0100
From: Jiri Olsa <olsajiri@...il.com>
To: Laura Nao <laura.nao@...labora.com>
Cc: ubizjak@...il.com, alan.maguire@...cle.com, bpf@...r.kernel.org,
	chrome-platform@...ts.linux.dev, kernel@...labora.com,
	linux-kernel@...r.kernel.org, regressions@...ts.linux.dev
Subject: Re: [REGRESSION] module BTF validation failure (Error -22) on next

On Wed, Dec 04, 2024 at 04:53:05PM +0100, Laura Nao wrote:
> On 11/15/24 18:17, Laura Nao wrote:
> > I managed to reproduce the issue locally and I've uploaded the vmlinux[1]
> > (stripped of DWARF data) and vmlinux.raw[2] files, as well as one of the
> > modules[3] and its btf data[4] extracted with:
> > 
> > bpftool -B vmlinux btf dump file cros_kbd_led_backlight.ko > cros_kbd_led_backlight.ko.raw
> > 
> > Looking again at the logs[5], I've noticed the following is reported:
> > 
> > [    0.415885] BPF: 	 type_id=115803 offset=177920 size=1152
> > [    0.416029] BPF:
> > [    0.416083] BPF: Invalid offset
> > [    0.416165] BPF:
> > 
> > There are two different definitions of rcu_data in '.data..percpu', one
> > is a struct and the other is an integer:
> > 
> > type_id=115801 offset=177920 size=1152 (VAR 'rcu_data')
> > type_id=115803 offset=177920 size=1152 (VAR 'rcu_data')
> > 
> > [115801] VAR 'rcu_data' type_id=115572, linkage=static
> > [115803] VAR 'rcu_data' type_id=1, linkage=static
> > 
> > [115572] STRUCT 'rcu_data' size=1152 vlen=69
> > [1] INT 'long unsigned int' size=8 bits_offset=0 nr_bits=64 encoding=(none)
> > 
> > I assume that's not expected, correct?
> > 
> > I'll dig a bit deeper and report back if I can find anything else.
> 
> I ran a bisection, and it appears the culprit commit is:
> https://lore.kernel.org/all/20241021080856.48746-2-ubizjak@gmail.com/

which tree are you using, I can't see this in linu-next ?

thanks,
jirka

> 
> Hi Uros, do you have any suggestions or insights on resolving this issue?
> 
> This problem is now impacting mainline as well. The full context can be 
> found at the beginning of this thread[1].
> 
> Thanks,
> 
> Laura
> 
> [1] https://lore.kernel.org/all/20241106160820.259829-1-laura.nao@collabora.com/
> 
> #regzbot introduced: 001217defd
> 
>