bcachefs (loop3): flushing journal and stopping allocators, journal seq 14 bcachefs (loop3): flushing journal and stopping allocators complete, journal seq 14 bcachefs (loop3): shutdown complete, journal seq 15 bcachefs (loop3): marking filesystem clean ====================================================== WARNING: possible circular locking dependency detected 6.10.0-rc1-next-20240531-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/5448 is trying to acquire lock: ffff888058881a60 (&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: ffff888058880918 (&c->sb_lock){+.+.}-{3:3}, at: bch2_fs_mark_clean+0x35/0x9f0 fs/bcachefs/sb-clean.c:287 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:5817 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 bch2_gc_mark_key+0xb3e/0x1050 fs/bcachefs/btree_gc.c:602 bch2_gc_btree fs/bcachefs/btree_gc.c:650 [inline] bch2_gc_btrees fs/bcachefs/btree_gc.c:699 [inline] bch2_check_allocations+0xa1db/0xb9d0 fs/bcachefs/btree_gc.c:1121 bch2_run_recovery_pass+0xf0/0x1e0 fs/bcachefs/recovery_passes.c:183 bch2_run_recovery_passes+0x19e/0x820 fs/bcachefs/recovery_passes.c:226 bch2_fs_recovery+0x238b/0x3730 fs/bcachefs/recovery.c:846 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1017 bch2_fs_open+0xa8d/0xdf0 fs/bcachefs/super.c:2113 bch2_mount fs/bcachefs/fs.c:1908 [inline] bch2_fs_get_tree+0x75e/0x14d0 fs/bcachefs/fs.c:2069 vfs_get_tree+0x90/0x2a0 fs/super.c:1780 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:3159 [inline] check_prevs_add kernel/locking/lockdep.c:3278 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3902 __lock_acquire+0x1359/0x2000 kernel/locking/lockdep.c:5194 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5817 __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+0x4a9/0x9f0 fs/bcachefs/sb-clean.c:314 bch2_fs_read_only+0x1115/0x1220 fs/bcachefs/super.c:367 __bch2_fs_stop+0x105/0x540 fs/bcachefs/super.c:601 generic_shutdown_super+0x136/0x2d0 fs/super.c:642 bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2025 deactivate_locked_super+0xc4/0x130 fs/super.c:473 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1267 task_work_run+0x24f/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+0x168/0x370 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.3/5448: #0: ffff8880568bc0e0 (&type->s_umount_key#89){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880568bc0e0 (&type->s_umount_key#89){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880568bc0e0 (&type->s_umount_key#89){+.+.}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505 #1: ffff888058880278 (&c->state_lock){+.+.}-{3:3}, at: __bch2_fs_stop+0xfd/0x540 fs/bcachefs/super.c:600 #2: ffff888058880918 (&c->sb_lock){+.+.}-{3:3}, at: bch2_fs_mark_clean+0x35/0x9f0 fs/bcachefs/sb-clean.c:287 stack backtrace: CPU: 0 PID: 5448 Comm: syz-executor.3 Not tainted 6.10.0-rc1-next-20240531-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2075 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2204 check_prev_add kernel/locking/lockdep.c:3159 [inline] check_prevs_add kernel/locking/lockdep.c:3278 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3902 __lock_acquire+0x1359/0x2000 kernel/locking/lockdep.c:5194 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5817 __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+0x4a9/0x9f0 fs/bcachefs/sb-clean.c:314 bch2_fs_read_only+0x1115/0x1220 fs/bcachefs/super.c:367 __bch2_fs_stop+0x105/0x540 fs/bcachefs/super.c:601 generic_shutdown_super+0x136/0x2d0 fs/super.c:642 bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2025 deactivate_locked_super+0xc4/0x130 fs/super.c:473 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1267 task_work_run+0x24f/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+0x168/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe81de7e217 Code: b0 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 b0 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007fff4c7a0988 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fe81de7e217 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff4c7a0a40 RBP: 00007fff4c7a0a40 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff4c7a1b00 R13: 00007fe81dec8336 R14: 000000000002cd5f R15: 0000000000000002 bcachefs (loop3): shutdown complete