------------[ cut here ]------------
WARNING: CPU: 1 PID: 6493 at fs/bcachefs/super.c:1219 bch2_dev_free+0x1e0/0x24c fs/bcachefs/super.c:1219
Modules linked in:
CPU: 1 UID: 0 PID: 6493 Comm: syz-executor Not tainted 6.15.0-rc2-syzkaller-gc72692105976 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : bch2_dev_free+0x1e0/0x24c fs/bcachefs/super.c:1219
lr : bch2_dev_free+0x1e0/0x24c fs/bcachefs/super.c:1219
sp : ffff8000a13d7b50
x29: ffff8000a13d7b60 x28: ffff0000f67003f0 x27: 1fffe0001ece00f6
x26: dfff800000000000 x25: ffff0000c94220d0 x24: ffff0000c9422000
x23: ffff0000f67003f0 x22: ffff80008fb18960 x21: 0000000000000000
x20: ffff0000f67007b2 x19: ffff0000c9422000 x18: 1fffe000367122b6
x17: ffff80008f2de000 x16: ffff80008ad04488 x15: 0000000000000009
x14: 1fffe00019284441 x13: 0000000000000000 x12: 0000000000000000
x11: ffff60001928444a x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000c757bd00 x7 : 0000000000000000 x6 : 000000000000003f
x5 : 0000000000000040 x4 : 0000000000000008 x3 : ffff800082a273c8
x2 : ffffffffffffffc0 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 bch2_dev_free+0x1e0/0x24c fs/bcachefs/super.c:1219 (P)
 bch2_fs_free+0x240/0x378 fs/bcachefs/super.c:684
 bch2_kill_sb+0x48/0x58 fs/bcachefs/fs.c:2304
 deactivate_locked_super+0xc4/0x12c fs/super.c:473
 deactivate_super+0xe0/0x100 fs/super.c:506
 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1435
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1442
 task_work_run+0x1dc/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 do_notify_resume+0x178/0x1f8 arch/arm64/kernel/entry-common.c:151
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]
 el0_svc+0xb0/0x150 arch/arm64/kernel/entry-common.c:745
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
irq event stamp: 665558
hardirqs last  enabled at (665557): [<ffff800080c20a4c>] kasan_quarantine_put+0x1a0/0x1c8 mm/kasan/quarantine.c:234
hardirqs last disabled at (665558): [<ffff80008ad96544>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:488
softirqs last  enabled at (665206): [<ffff800080a63dd4>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (665206): [<ffff800080a63dd4>] bdi_remove_from_list mm/backing-dev.c:1147 [inline]
softirqs last  enabled at (665206): [<ffff800080a63dd4>] bdi_unregister+0x150/0x494 mm/backing-dev.c:1157
softirqs last disabled at (665204): [<ffff800080a63d10>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (665204): [<ffff800080a63d10>] bdi_remove_from_list mm/backing-dev.c:1144 [inline]
softirqs last disabled at (665204): [<ffff800080a63d10>] bdi_unregister+0x8c/0x494 mm/backing-dev.c:1157
---[ end trace 0000000000000000 ]---
bcachefs (loop1): shutdown complete