linux-kernel - Re: [syzbot] [fs?] INFO: task hung in synchronize

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Message-ID: <048219d7-2403-b898-129f-a0f85512cdf5@linux.dev>
Date:   Sat, 20 May 2023 19:26:22 -0700
From:   Martin KaFai Lau <martin.lau@...ux.dev>
To:     syzbot <syzbot+222aa26d0a5dbc2e84fe@...kaller.appspotmail.com>,
        syzkaller-bugs@...glegroups.com
Cc:     amir73il@...il.com, bpf@...r.kernel.org, daniel@...earbox.net,
        davem@...emloft.net, edumazet@...gle.com, hdanton@...a.com,
        jack@...e.cz, kuba@...nel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com, penguin-kernel@...ove.sakura.ne.jp,
        peterz@...radead.org, torvalds@...ux-foundation.org,
        willemdebruijn.kernel@...il.com
Subject: Re: [syzbot] [fs?] INFO: task hung in synchronize_rcu (4)

On 5/20/23 3:13 PM, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    dcbe4ea1985d Merge branch '1GbE' of git://git.kernel.org/p..
> git tree:       net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=123ebd91280000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=f20b05fe035db814
> dashboard link: https://syzkaller.appspot.com/bug?extid=222aa26d0a5dbc2e84fe
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1495596a280000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1529326a280000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/41b9dda0e686/disk-dcbe4ea1.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/64d9bece8f89/vmlinux-dcbe4ea1.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/42429896dca0/bzImage-dcbe4ea1.xz
> 
> The issue was bisected to:
> 
> commit 3b5d4ddf8fe1f60082513f94bae586ac80188a03
> Author: Martin KaFai Lau <kafai@...com>
> Date:   Wed Mar 9 09:04:50 2022 +0000
> 
>      bpf: net: Remove TC_AT_INGRESS_OFFSET and SKB_MONO_DELIVERY_TIME_OFFSET macro

I am afraid this bisect is incorrect. The commit removed a redundant macro and 
is a no-op change.