linux-kernel - [syzbot] [fs?] WARNING in rcu_sync

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Message-ID: <673866ee.050a0220.85a0.0013.GAE@google.com>
Date: Sat, 16 Nov 2024 01:33:34 -0800
From: syzbot <syzbot+823cd0d24881f21ab9f1@...kaller.appspotmail.com>
To: brauner@...nel.org, dongliang.cui@...soc.com, jack@...e.cz, 
	linkinjeon@...nel.org, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, 
	viro@...iv.linux.org.uk, zhiguo.niu@...soc.com
Subject: [syzbot] [fs?] WARNING in rcu_sync_dtor (2)

Hello,

syzbot found the following issue on:

HEAD commit:    2d5404caa8c7 Linux 6.12-rc7
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14f7b35f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1503500c6f615d24
dashboard link: https://syzkaller.appspot.com/bug?extid=823cd0d24881f21ab9f1
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=16f7b35f980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12188ce8580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a2d329b82126/disk-2d5404ca.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/37a04ca225dd/vmlinux-2d5404ca.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4f837ce9d9dc/bzImage-2d5404ca.xz
mounted in repro #1: https://storage.googleapis.com/syzbot-assets/6696bb7d0ad1/mount_0.gz
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/c4373413d8ae/mount_5.gz

The issue was bisected to:

commit f761fcdd289d07e8547fef7ac76c3760fc7803f2
Author: Dongliang Cui <dongliang.cui@...soc.com>
Date:   Tue Sep 17 22:40:05 2024 +0000

    exfat: Implement sops->shutdown and ioctl

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=129df35f980000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=119df35f980000
console output: https://syzkaller.appspot.com/x/log.txt?x=169df35f980000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+823cd0d24881f21ab9f1@...kaller.appspotmail.com
Fixes: f761fcdd289d ("exfat: Implement sops->shutdown and ioctl")

------------[ cut here ]------------
WARNING: CPU: 0 PID: 9 at kernel/rcu/sync.c:177 rcu_sync_dtor+0xcd/0x180 kernel/rcu/sync.c:177
Modules linked in:
CPU: 0 UID: 0 PID: 9 Comm: kworker/0:1 Not tainted 6.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Workqueue: events destroy_super_work
RIP: 0010:rcu_sync_dtor+0xcd/0x180 kernel/rcu/sync.c:177
Code: 74 19 e8 96 dd 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:ffffc900000e7b30 EFLAGS: 00010246

RAX: 0000000000000002 RBX: 1ffff1100fba4077 RCX: ffff88801d2b8000
RDX: 0000000000000000 RSI: ffffffff8c603640 RDI: ffff88807dd20350
RBP: 00000000000001e4 R08: ffffffff820ee1c4 R09: 1ffffffff1cfbc21
R10: dffffc0000000000 R11: fffffbfff1cfbc22 R12: dffffc0000000000
R13: 1ffff1100fba406a R14: ffff88807dd20350 R15: ffff88807dd20350
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555567cdece8 CR3: 0000000030508000 CR4: 00000000003526f0
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+0xef/0x130 fs/super.c:282
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 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.
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection

If the report is already addressed, let syzbot know by replying with:
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