bcachefs (loop0): flushing journal and stopping allocators, journal seq 10
bcachefs (loop0): flushing journal and stopping allocators complete, journal seq 11
bcachefs (loop0): shutdown complete, journal seq 12
bcachefs (loop0): marking filesystem clean
======================================================
WARNING: possible circular locking dependency detected
6.10.0-rc6-syzkaller-00163-g661e504db04c #0 Not tainted
------------------------------------------------------
syz-executor/5340 is trying to acquire lock:
ffff88804d081a58 (&c->btree_root_lock){+.+.}-{3:3}, at: bch2_btree_roots_to_journal_entries+0xbb/0x980 fs/bcachefs/btree_update_interior.c:2633
but task is already holding lock:
ffff88804d080988 (&c->sb_lock){+.+.}-{3:3}, at: bch2_fs_mark_clean+0x84/0x6d0 fs/bcachefs/sb-clean.c:349
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&c->sb_lock){+.+.}-{3:3}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
bch2_gc_mark_key+0xc6a/0x1010 fs/bcachefs/btree_gc.c:600
bch2_gc_btree fs/bcachefs/btree_gc.c:648 [inline]
bch2_gc_btrees fs/bcachefs/btree_gc.c:697 [inline]
bch2_check_allocations+0x3e06/0xccc0 fs/bcachefs/btree_gc.c:1224
bch2_run_recovery_pass+0xf2/0x1e0 fs/bcachefs/recovery_passes.c:182
bch2_run_recovery_passes+0x19e/0x820 fs/bcachefs/recovery_passes.c:225
bch2_fs_recovery+0x2386/0x3730 fs/bcachefs/recovery.c:813
bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1035
bch2_fs_open+0xa8d/0xdf0 fs/bcachefs/super.c:2132
bch2_mount+0x6b0/0x13a0 fs/bcachefs/fs.c:1926
legacy_get_tree+0xf0/0x190 fs/fs_context.c:662
vfs_get_tree+0x92/0x2a0 fs/super.c:1789
do_new_mount+0x2be/0xb40 fs/namespace.c:3352
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&c->btree_root_lock){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3869
__lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
bch2_btree_roots_to_journal_entries+0xbb/0x980 fs/bcachefs/btree_update_interior.c:2633
bch2_fs_mark_clean+0x2cc/0x6d0 fs/bcachefs/sb-clean.c:376
bch2_fs_read_only+0x1101/0x1210 fs/bcachefs/super.c:381
__bch2_fs_stop+0x105/0x540 fs/bcachefs/super.c:614
generic_shutdown_super+0x138/0x2d0 fs/super.c:642
bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2044
deactivate_locked_super+0xc6/0x130 fs/super.c:473
cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1267
task_work_run+0x251/0x310 kernel/task_work.c:180
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x168/0x360 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&c->sb_lock);
lock(&c->btree_root_lock);
lock(&c->sb_lock);
lock(&c->btree_root_lock);
*** DEADLOCK ***
3 locks held by syz-executor/5340:
#0: ffff88804d3ce0e0 (&type->s_umount_key#83){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88804d3ce0e0 (&type->s_umount_key#83){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88804d3ce0e0 (&type->s_umount_key#83){+.+.}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
#1: ffff88804d080278 (&c->state_lock){+.+.}-{3:3}, at: __bch2_fs_stop+0xfd/0x540 fs/bcachefs/super.c:613
#2: ffff88804d080988 (&c->sb_lock){+.+.}-{3:3}, at: bch2_fs_mark_clean+0x84/0x6d0 fs/bcachefs/sb-clean.c:349
stack backtrace:
CPU: 0 PID: 5340 Comm: syz-executor Not tainted 6.10.0-rc6-syzkaller-00163-g661e504db04c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2187
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3869
__lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
bch2_btree_roots_to_journal_entries+0xbb/0x980 fs/bcachefs/btree_update_interior.c:2633
bch2_fs_mark_clean+0x2cc/0x6d0 fs/bcachefs/sb-clean.c:376
bch2_fs_read_only+0x1101/0x1210 fs/bcachefs/super.c:381
__bch2_fs_stop+0x105/0x540 fs/bcachefs/super.c:614
generic_shutdown_super+0x138/0x2d0 fs/super.c:642
bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2044
deactivate_locked_super+0xc6/0x130 fs/super.c:473
cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1267
task_work_run+0x251/0x310 kernel/task_work.c:180
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x168/0x360 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb585d76f07
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffea9a198a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fb585d76f07
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffea9a19960
RBP: 00007ffea9a19960 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffea9a1aa30
R13: 00007fb585de3515 R14: 0000000000035079 R15: 0000000000000007
</TASK>
bcachefs (loop0): shutdown complete