====================================================== WARNING: possible circular locking dependency detected 6.1.131-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor/4263 is trying to acquire lock: ffff88805694c938 ((wq_completion)ocfs2_wq){+.+.}-{0:0}, at: __flush_workqueue+0x157/0x1610 kernel/workqueue.c:2812 but task is already holding lock: ffff8880568e00e0 (&type->s_umount_key#57){++++}-{3:3}, at: deactivate_super+0xa9/0xe0 fs/super.c:362 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&type->s_umount_key#57){++++}-{3:3}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 down_read+0xad/0xa30 kernel/locking/rwsem.c:1520 ocfs2_finish_quota_recovery+0x158/0x2300 fs/ocfs2/quota_local.c:600 ocfs2_complete_recovery+0x18e2/0x2840 fs/ocfs2/journal.c:1324 process_one_work+0x917/0x1260 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 -> #1 ((work_completion)(&journal->j_recovery_work)){+.+.}-{0:0}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 process_one_work+0x839/0x1260 kernel/workqueue.c:2268 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 -> #0 ((wq_completion)ocfs2_wq){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __flush_workqueue+0x170/0x1610 kernel/workqueue.c:2812 ocfs2_shutdown_local_alloc+0x105/0xa90 fs/ocfs2/localalloc.c:379 ocfs2_dismount_volume+0x1fb/0x960 fs/ocfs2/super.c:1879 generic_shutdown_super+0x130/0x340 fs/super.c:501 kill_block_super+0x7a/0xe0 fs/super.c:1470 deactivate_locked_super+0xa0/0x110 fs/super.c:332 cleanup_mnt+0x490/0x520 fs/namespace.c:1186 task_work_run+0x246/0x300 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: (wq_completion)ocfs2_wq --> (work_completion)(&journal->j_recovery_work) --> &type->s_umount_key#57 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&type->s_umount_key#57); lock((work_completion)(&journal->j_recovery_work)); lock(&type->s_umount_key#57); lock((wq_completion)ocfs2_wq); *** DEADLOCK *** 1 lock held by syz-executor/4263: #0: ffff8880568e00e0 (&type->s_umount_key#57){++++}-{3:3}, at: deactivate_super+0xa9/0xe0 fs/super.c:362 stack backtrace: CPU: 0 PID: 4263 Comm: syz-executor Not tainted 6.1.131-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __flush_workqueue+0x170/0x1610 kernel/workqueue.c:2812 ocfs2_shutdown_local_alloc+0x105/0xa90 fs/ocfs2/localalloc.c:379 ocfs2_dismount_volume+0x1fb/0x960 fs/ocfs2/super.c:1879 generic_shutdown_super+0x130/0x340 fs/super.c:501 kill_block_super+0x7a/0xe0 fs/super.c:1470 deactivate_locked_super+0xa0/0x110 fs/super.c:332 cleanup_mnt+0x490/0x520 fs/namespace.c:1186 task_work_run+0x246/0x300 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f2ed0d8e497 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:00007ffe80e67218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f2ed0e0e08c RCX: 00007f2ed0d8e497 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe80e672d0 RBP: 00007ffe80e672d0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe80e68360 R13: 00007f2ed0e0e08c R14: 00000000000132b2 R15: 00007ffe80e683a0 ocfs2: Unmounting device (7,2) on (node local)