linux-kernel - Re: BUG: unable to handle kernel paging request in bpf_dispatcher

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Message-ID: <90bf9797-a949-b75b-285a-9056b9ba7f56@leemhuis.info>
Date:   Mon, 19 Dec 2022 10:59:51 +0100
From:   Thorsten Leemhuis <regressions@...mhuis.info>
To:     bpf <bpf@...r.kernel.org>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: BUG: unable to handle kernel paging request in bpf_dispatcher_xdp
 #forregzbot

On 08.12.22 09:44, Thorsten Leemhuis wrote:
> [Note: this mail contains only information for Linux kernel regression
> tracking. Mails like these contain '#forregzbot' in the subject to make
> then easy to spot and filter out. The author also tried to remove most
> or all individuals from the list of recipients to spare them the hassle.]
> 
> On 06.12.22 04:28, Hao Sun wrote:
>>
>> The following crash can be triggered with the BPF prog provided.
>> It seems the verifier passed some invalid progs. I will try to simplify
>> the C reproducer, for now, the following can reproduce this:
> 
> Thanks for the report. To be sure below issue doesn't fall through the
> cracks unnoticed, I'm adding it to regzbot, my Linux kernel regression
> tracking bot:
> 
> #regzbot ^introduced c86df29d11df
> #regzbot title net/bpf: BUG: unable to handle kernel paging request in
> bpf_dispatcher_xdp
> #regzbot ignore-activity

#regzbot fix: bpf: Synchronize dispatcher update with
bpf_dispatcher_xdp_func