====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ kworker/u4:5/4237 is trying to acquire lock: ffff88807ced0990 (jbd2_handle){++++}-{0:0}, at: wait_transaction_locked+0x19f/0x270 fs/jbd2/transaction.c:178 but task is already holding lock: ffff8880606df4e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a6/0x6f0 fs/ocfs2/journal.c:374 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&journal->j_trans_barrier){.+.+}-{3:3}: down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_start_trans+0x3a6/0x6f0 fs/ocfs2/journal.c:374 ocfs2_shutdown_local_alloc+0x1f3/0xac0 fs/ocfs2/localalloc.c:416 ocfs2_dismount_volume+0x1e1/0x890 fs/ocfs2/super.c:1885 generic_shutdown_super+0x130/0x300 fs/super.c:475 kill_block_super+0x7c/0xe0 fs/super.c:1427 deactivate_locked_super+0x93/0xf0 fs/super.c:335 cleanup_mnt+0x426/0x4d0 fs/namespace.c:1148 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #4 (sb_internal #3){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1811 [inline] sb_start_intwrite include/linux/fs.h:1928 [inline] ocfs2_start_trans+0x2a7/0x6f0 fs/ocfs2/journal.c:372 ocfs2_acquire_dquot+0x6c0/0xb30 fs/ocfs2/quota_global.c:848 dqget+0x713/0xbb0 fs/quota/dquot.c:1010 __dquot_initialize+0x3a9/0xd00 fs/quota/dquot.c:1539 ocfs2_get_init_inode+0x144/0x1b0 fs/ocfs2/namei.c:202 ocfs2_mknod+0x8c1/0x2510 fs/ocfs2/namei.c:310 ocfs2_create+0x192/0x420 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3470 [inline] open_last_lookups fs/namei.c:3540 [inline] path_openat+0x120a/0x2fb0 fs/namei.c:3747 do_filp_open+0x1df/0x400 fs/namei.c:3777 do_sys_openat2+0x14b/0x500 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_openat fs/open.c:1287 [inline] __se_sys_openat fs/open.c:1282 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1282 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #3 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}: down_write+0x38/0x60 kernel/locking/rwsem.c:1551 ocfs2_create_local_dquot+0x199/0x18d0 fs/ocfs2/quota_local.c:1224 ocfs2_acquire_dquot+0x822/0xb30 fs/ocfs2/quota_global.c:871 dqget+0x713/0xbb0 fs/quota/dquot.c:1010 __dquot_initialize+0x3a9/0xd00 fs/quota/dquot.c:1539 ocfs2_get_init_inode+0x144/0x1b0 fs/ocfs2/namei.c:202 ocfs2_mknod+0x8c1/0x2510 fs/ocfs2/namei.c:310 ocfs2_create+0x192/0x420 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3470 [inline] open_last_lookups fs/namei.c:3540 [inline] path_openat+0x120a/0x2fb0 fs/namei.c:3747 do_filp_open+0x1df/0x400 fs/namei.c:3777 do_sys_openat2+0x14b/0x500 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_openat fs/open.c:1287 [inline] __se_sys_openat fs/open.c:1282 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1282 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #2 (&dquot->dq_lock){+.+.}-{3:3}: __mutex_lock_common+0x1e5/0x2400 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 dquot_commit+0x5a/0x410 fs/quota/dquot.c:532 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6212 mark_dquot_dirty fs/quota/dquot.c:397 [inline] mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:437 __dquot_free_space+0x7c3/0xb80 fs/quota/dquot.c:1964 dquot_free_space_nodirty include/linux/quotaops.h:369 [inline] dquot_free_space include/linux/quotaops.h:374 [inline] dquot_free_block include/linux/quotaops.h:385 [inline] ext4_mb_clear_bb fs/ext4/mballoc.c:6164 [inline] ext4_free_blocks+0x1b1b/0x24c0 fs/ext4/mballoc.c:6294 ext4_remove_blocks fs/ext4/extents.c:2540 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2706 [inline] ext4_ext_remove_space+0x2106/0x41a0 fs/ext4/extents.c:2954 ext4_ext_truncate+0x182/0x230 fs/ext4/extents.c:4504 ext4_truncate+0xa41/0x1190 fs/ext4/inode.c:4263 ext4_setattr+0x117c/0x1b70 fs/ext4/inode.c:5620 notify_change+0xbc6/0xee0 fs/attr.c:505 do_truncate+0x1ac/0x240 fs/open.c:65 handle_truncate fs/namei.c:3273 [inline] do_open fs/namei.c:3620 [inline] path_openat+0x293b/0x2fb0 fs/namei.c:3750 do_filp_open+0x1df/0x400 fs/namei.c:3777 do_sys_openat2+0x14b/0x500 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_openat fs/open.c:1287 [inline] __se_sys_openat fs/open.c:1282 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1282 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #1 (&ei->i_data_sem){++++}-{3:3}: down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 ext4_map_blocks+0x350/0x1a50 fs/ext4/inode.c:600 ext4_append+0x22d/0x560 fs/ext4/namei.c:75 ext4_init_new_dir+0x2a7/0x910 fs/ext4/namei.c:3030 ext4_mkdir+0x4c3/0xc90 fs/ext4/namei.c:3076 vfs_mkdir+0x386/0x570 fs/namei.c:4073 do_mkdirat+0x1dd/0x5c0 fs/namei.c:4098 __do_sys_mkdir fs/namei.c:4118 [inline] __se_sys_mkdir fs/namei.c:4116 [inline] __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4116 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (jbd2_handle){++++}-{0:0}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c66/0x7b50 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 wait_transaction_locked+0x1bb/0x270 fs/jbd2/transaction.c:178 add_transaction_credits+0x104/0xcb0 fs/jbd2/transaction.c:242 start_this_handle+0x723/0x1560 fs/jbd2/transaction.c:423 jbd2__journal_start+0x2b7/0x5a0 fs/jbd2/transaction.c:521 jbd2_journal_start+0x26/0x30 fs/jbd2/transaction.c:560 ocfs2_start_trans+0x3b2/0x6f0 fs/ocfs2/journal.c:376 ocfs2_release_dquot+0x458/0xb60 fs/ocfs2/quota_global.c:749 quota_release_workfn+0x361/0x5e0 fs/quota/dquot.c:872 process_one_work+0x867/0xff0 kernel/workqueue.c:2310 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457 kthread+0x42e/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 other info that might help us debug this: Chain exists of: jbd2_handle --> sb_internal#3 --> &journal->j_trans_barrier Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&journal->j_trans_barrier); lock(sb_internal#3); lock(&journal->j_trans_barrier); lock(jbd2_handle); *** DEADLOCK *** 7 locks held by kworker/u4:5/4237: #0: ffff888016c79138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1 #1: ffffc9000321fd00 ((quota_release_work).work){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285 #2: ffff88805d3a00a8 (&dquot->dq_lock){+.+.}-{3:3}, at: ocfs2_release_dquot+0x231/0xb60 fs/ocfs2/quota_global.c:729 #3: ffff88805d3342c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#8){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #3: ffff88805d3342c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#8){+.+.}-{3:3}, at: ocfs2_lock_global_qf+0x1d7/0x290 fs/ocfs2/quota_global.c:313 #4: ffff88805d333f60 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_lock_global_qf+0x1fe/0x290 fs/ocfs2/quota_global.c:314 #5: ffff88807dffe650 (sb_internal#3){.+.+}-{0:0}, at: ocfs2_release_dquot+0x458/0xb60 fs/ocfs2/quota_global.c:749 #6: ffff8880606df4e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a6/0x6f0 fs/ocfs2/journal.c:374 stack backtrace: CPU: 0 PID: 4237 Comm: kworker/u4:5 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026 Workqueue: events_unbound quota_release_workfn Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c66/0x7b50 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 wait_transaction_locked+0x1bb/0x270 fs/jbd2/transaction.c:178 add_transaction_credits+0x104/0xcb0 fs/jbd2/transaction.c:242 start_this_handle+0x723/0x1560 fs/jbd2/transaction.c:423 jbd2__journal_start+0x2b7/0x5a0 fs/jbd2/transaction.c:521 jbd2_journal_start+0x26/0x30 fs/jbd2/transaction.c:560 ocfs2_start_trans+0x3b2/0x6f0 fs/ocfs2/journal.c:376 ocfs2_release_dquot+0x458/0xb60 fs/ocfs2/quota_global.c:749 quota_release_workfn+0x361/0x5e0 fs/quota/dquot.c:872 process_one_work+0x867/0xff0 kernel/workqueue.c:2310 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457 kthread+0x42e/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 netdevsim netdevsim4 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim4 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim4 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim4 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 device hsr_slave_0 left promiscuous mode device hsr_slave_1 left promiscuous mode batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state device veth1_macvtap left promiscuous mode device veth0_macvtap left promiscuous mode device veth1_vlan left promiscuous mode device veth0_vlan left promiscuous mode team0 (unregistering): Port device team_slave_1 removed team0 (unregistering): Port device team_slave_0 removed bond0 (unregistering): (slave bond_slave_1): Releasing backup interface bond0 (unregistering): (slave bond_slave_0): Releasing backup interface bond0 (unregistering): Released all slaves