linux-kernel - Re: [syzbot] [f2fs?] WARNING in rcu_sync

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Message-ID: <2fba030d-bd24-4a3d-852e-e10a484feaaf@kernel.org>
Date: Wed, 11 Sep 2024 09:48:10 +0800
From: Chao Yu <chao@...nel.org>
To: syzbot <syzbot+20d7e439f76bbbd863a7@...kaller.appspotmail.com>
Cc: chao@...nel.org, brauner@...nel.org, jack@...e.cz, jaegeuk@...nel.org,
 linux-f2fs-devel@...ts.sourceforge.net, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
 viro@...iv.linux.org.uk
Subject: Re: [syzbot] [f2fs?] WARNING in rcu_sync_dtor

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git wip

On 2024/7/26 15:54, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    1722389b0d86 Merge tag 'net-6.11-rc1' of git://git.kernel...
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=14955423980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=b698a1b2fcd7ef5f
> dashboard link: https://syzkaller.appspot.com/bug?extid=20d7e439f76bbbd863a7
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1237a1f1980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=115edac9980000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/e3f4ec8ccf7c/disk-1722389b.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/f19bcd908282/vmlinux-1722389b.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/d93604974a98/bzImage-1722389b.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/e0d10e1258f5/mount_0.gz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+20d7e439f76bbbd863a7@...kaller.appspotmail.com
> 
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 58 at kernel/rcu/sync.c:177 rcu_sync_dtor+0xcd/0x180 kernel/rcu/sync.c:177
> Modules linked in:
> CPU: 1 UID: 0 PID: 58 Comm: kworker/1:2 Not tainted 6.10.0-syzkaller-12562-g1722389b0d86 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
> Workqueue: events destroy_super_work
> RIP: 0010:rcu_sync_dtor+0xcd/0x180 kernel/rcu/sync.c:177
> Code: 74 19 e8 86 d5 00 00 43 0f b6 44 25 00 84 c0 0f 85 82 00 00 00 41 83 3f 00 75 1d 5b 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 90 <0f> 0b 90 e9 66 ff ff ff 90 0f 0b 90 eb 89 90 0f 0b 90 eb dd 44 89
> RSP: 0018:ffffc9000133fb30 EFLAGS: 00010246
> RAX: 0000000000000002 RBX: 1ffff11005324477 RCX: ffff8880163f5a00
> RDX: 0000000000000000 RSI: ffffffff8c3f9540 RDI: ffff888029922350
> RBP: 0000000000000167 R08: ffffffff82092061 R09: 1ffffffff1cbbbd4
> R10: dffffc0000000000 R11: fffffbfff1cbbbd5 R12: dffffc0000000000
> R13: 1ffff1100532446a R14: ffff888029922350 R15: ffff888029922350
> FS:  0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000055557c167738 CR3: 000000007ada8000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   <TASK>
>   percpu_free_rwsem+0x41/0x80 kernel/locking/percpu-rwsem.c:42
>   destroy_super_work+0xec/0x130 fs/super.c:282
>   process_one_work kernel/workqueue.c:3231 [inline]
>   process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
>   worker_thread+0x86d/0xd40 kernel/workqueue.c:3390
>   kthread+0x2f0/0x390 kernel/kthread.c:389
>   ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
>   </TASK>
> 
> 
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> 
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
> 
> If you want syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash
> If you attach or paste a git patch, syzbot will apply it before testing.
> 
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
> 
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
> 
> If you want to undo deduplication, reply with:
> #syz undup