netdev - Re: [syzbot] [mm?] INFO: rcu detected stall in sys

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Message-ID: <20250818182616.GB222315@ZenIV>
Date: Mon, 18 Aug 2025 19:26:16 +0100
From: Al Viro <viro@...iv.linux.org.uk>
To: syzbot <syzbot+1ec0f904ba50d06110b1@...kaller.appspotmail.com>
Cc: andrii@...nel.org, ast@...nel.org, bigeasy@...utronix.de,
	bpf@...r.kernel.org, brauner@...nel.org, daniel@...earbox.net,
	davem@...emloft.net, eddyz87@...il.com, edumazet@...gle.com,
	haoluo@...gle.com, jack@...e.cz, jiri@...nulli.us,
	john.fastabend@...il.com, jolsa@...nel.org,
	kerneljasonxing@...il.com, kpsingh@...nel.org, kuba@...nel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, martin.lau@...ux.dev, netdev@...r.kernel.org,
	pabeni@...hat.com, sdf@...ichev.me, song@...nel.org,
	syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
	yonghong.song@...ux.dev
Subject: Re: [syzbot] [mm?] INFO: rcu detected stall in sys_umount (3)

On Mon, Aug 18, 2025 at 02:42:28AM -0700, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    8f5ae30d69d7 Linux 6.17-rc1
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
> console output: https://syzkaller.appspot.com/x/log.txt?x=1321eba2580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8c5ac3d8b8abfcb
> dashboard link: https://syzkaller.appspot.com/bug?extid=1ec0f904ba50d06110b1
> compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
> userspace arch: arm64
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10cba442580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10a1eba2580000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/18a2e4bd0c4a/disk-8f5ae30d.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/3b5395881b25/vmlinux-8f5ae30d.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/e875f4e3b7ff/Image-8f5ae30d.gz.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/43186d9e448c/mount_0.gz
>   fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=174ba442580000)
> 
> The issue was bisected to:
> 
> commit d15121be7485655129101f3960ae6add40204463
> Author: Paolo Abeni <pabeni@...hat.com>
> Date:   Mon May 8 06:17:44 2023 +0000
> 
>     Revert "softirq: Let ksoftirqd do its job"

Would be interesting to see how it behaves on 

git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git #fixes (cda250b0fc83)