Message-ID: <6734c686.050a0220.2a2fcc.002b.GAE@google.com>
Date: Wed, 13 Nov 2024 07:32:22 -0800
From: syzbot <syzbot+828d8ee1e5e42c37d573@...kaller.appspotmail.com>
To: clm@...com, dsterba@...e.com, josef@...icpanda.com, 
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [btrfs?] BUG: unable to handle kernel paging request in btrfs_stop_all_workers

Hello,

syzbot found the following issue on:

HEAD commit:    baa007e8da32 Merge branch 'for-next/core' into for-kernelci
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=12df8130580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9ce37d357fac206c
dashboard link: https://syzkaller.appspot.com/bug?extid=828d8ee1e5e42c37d573
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/091805c67446/disk-baa007e8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/853803d703a2/vmlinux-baa007e8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/65373a9a8186/Image-baa007e8.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+828d8ee1e5e42c37d573@...kaller.appspotmail.com

BTRFS info (device loop2): last unmount of filesystem 3a492a15-ac49-4ce6-945e-cef7a687c6c9
Unable to handle kernel paging request at virtual address f2ff9fffe0001824
KASAN: maybe wild-memory-access in range [0x9800ffff0000c120-0x9800ffff0000c127]
Mem abort info:
  ESR = 0x0000000096000004
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x04: level 0 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[f2ff9fffe0001824] address between user and kernel address ranges
Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 UID: 0 PID: 6432 Comm: syz-executor Not tainted 6.12.0-rc7-syzkaller-gbaa007e8da32 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __lock_acquire+0xfc/0x77c8 kernel/locking/lockdep.c:5065
lr : lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5825
sp : ffff8000a2b47280
x29: ffff8000a2b47540 x28: ffff80008025cf24 x27: 0000000000000000
x26: ffff0001b365a4c0 x25: 0000000000000000 x24: 0000000000000001
x23: 0000000000000000 x22: 1ffff00011f020ba x21: 9800ffff0000c120
x20: 0000000000000001 x19: 0000000000000000 x18: 1fffe000366cb476
x17: ffff80008f80d000 x16: ffff8000830cd010 x15: 0000000000000001
x14: ffff80008f8105d8 x13: dfff800000000000 x12: ffff700014568e78
x11: ffff800080359190 x10: ffff80008f8105d4 x9 : 00000000000000f3
x8 : 13001fffe0001824 x7 : ffff80008025cf24 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 9800ffff0000c120
Call trace:
 __lock_acquire+0xfc/0x77c8 kernel/locking/lockdep.c:5065 (P)
 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5825 (L)
 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5825
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0x58/0x70 kernel/locking/spinlock.c:170
 put_pwq_unlocked kernel/workqueue.c:1662 [inline]
 destroy_workqueue+0x8d8/0xdc0 kernel/workqueue.c:5883
 btrfs_stop_all_workers+0x10c/0x240 fs/btrfs/disk-io.c:1787
 close_ctree+0x598/0xb3c fs/btrfs/disk-io.c:4362
 btrfs_put_super+0x70/0x80 fs/btrfs/super.c:75
 generic_shutdown_super+0x12c/0x2bc fs/super.c:642
 kill_anon_super+0x4c/0x7c fs/super.c:1237
 btrfs_kill_super+0x40/0x58 fs/btrfs/super.c:2114
 deactivate_locked_super+0xc4/0x12c fs/super.c:473
 deactivate_super+0xe0/0x100 fs/super.c:506
 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1373
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1380
 task_work_run+0x230/0x2e0 kernel/task_work.c:239
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0x4ec/0x1ad0 kernel/exit.c:939
 do_group_exit+0x194/0x22c kernel/exit.c:1088
 __do_sys_exit_group kernel/exit.c:1099 [inline]
 __se_sys_exit_group kernel/exit.c:1097 [inline]
 pid_child_should_wake+0x0/0x1dc kernel/exit.c:1097
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
Code: f007a5a8 b945d508 34008c88 d343fea8 (386d6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	f007a5a8 	adrp	x8, 0xf4b7000
   4:	b945d508 	ldr	w8, [x8, #1492]
   8:	34008c88 	cbz	w8, 0x1198
   c:	d343fea8 	lsr	x8, x21, #3
* 10:	386d6908 	ldrb	w8, [x8, x13] <-- trapping instruction


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