====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.7.433/7042 is trying to acquire lock: ffff0000ff146650 (sb_internal#3){.+.+}-{0:0}, at: ocfs2_acquire_dquot+0x5d0/0xab0 fs/ocfs2/quota_global.c:848 but task is already holding lock: ffff0000d76b5be0 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_lock_global_qf+0x1ac/0x23c fs/ocfs2/quota_global.c:314 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #6 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}: down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 ocfs2_lock_global_qf+0x1ac/0x23c fs/ocfs2/quota_global.c:314 ocfs2_acquire_dquot+0x260/0xab0 fs/ocfs2/quota_global.c:816 dqget+0x638/0xa98 fs/quota/dquot.c:1013 __dquot_initialize+0x2e4/0xb30 fs/quota/dquot.c:1542 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1604 ocfs2_get_init_inode+0x140/0x1b4 fs/ocfs2/namei.c:202 ocfs2_mknod+0x7d4/0x218c fs/ocfs2/namei.c:310 ocfs2_mkdir+0x19c/0x51c fs/ocfs2/namei.c:657 vfs_mkdir+0x314/0x4d8 fs/namei.c:4114 do_mkdirat+0x1b8/0x3ec fs/namei.c:4139 __do_sys_mkdirat fs/namei.c:4154 [inline] __se_sys_mkdirat fs/namei.c:4152 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4152 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #5 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7){+.+.}-{3:3}: down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:758 [inline] ocfs2_lock_global_qf+0x190/0x23c fs/ocfs2/quota_global.c:313 ocfs2_acquire_dquot+0x260/0xab0 fs/ocfs2/quota_global.c:816 dqget+0x638/0xa98 fs/quota/dquot.c:1013 __dquot_initialize+0x2e4/0xb30 fs/quota/dquot.c:1542 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1604 ocfs2_get_init_inode+0x140/0x1b4 fs/ocfs2/namei.c:202 ocfs2_mknod+0x7d4/0x218c fs/ocfs2/namei.c:310 ocfs2_mkdir+0x19c/0x51c fs/ocfs2/namei.c:657 vfs_mkdir+0x314/0x4d8 fs/namei.c:4114 do_mkdirat+0x1b8/0x3ec fs/namei.c:4139 __do_sys_mkdirat fs/namei.c:4154 [inline] __se_sys_mkdirat fs/namei.c:4152 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4152 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #4 (&dquot->dq_lock){+.+.}-{3:3}: __mutex_lock_common+0x1a0/0x1f3c kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 dquot_commit+0x54/0x1c8 fs/quota/dquot.c:535 ext4_write_dquot+0x1b4/0x320 fs/ext4/super.c:6817 ext4_mark_dquot_dirty+0xe8/0x150 fs/ext4/super.c:6894 mark_dquot_dirty fs/quota/dquot.c:400 [inline] mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:440 __dquot_alloc_space+0x564/0xcfc fs/quota/dquot.c:1777 dquot_alloc_space_nodirty include/linux/quotaops.h:293 [inline] dquot_alloc_space include/linux/quotaops.h:306 [inline] dquot_alloc_block include/linux/quotaops.h:330 [inline] ext4_mb_new_blocks+0xd40/0x4244 fs/ext4/mballoc.c:5740 ext4_ext_map_blocks+0x1330/0x563c fs/ext4/extents.c:4361 ext4_map_blocks+0x7b0/0x160c fs/ext4/inode.c:681 ext4_getblk+0x178/0x680 fs/ext4/inode.c:892 ext4_bread+0x3c/0x1a8 fs/ext4/inode.c:948 ext4_append+0x23c/0x488 fs/ext4/namei.c:83 ext4_init_new_dir+0x270/0x4f0 fs/ext4/namei.c:3030 ext4_mkdir+0x3b8/0xa28 fs/ext4/namei.c:3076 vfs_mkdir+0x314/0x4d8 fs/namei.c:4114 do_mkdirat+0x1b8/0x3ec fs/namei.c:4139 __do_sys_mkdirat fs/namei.c:4154 [inline] __se_sys_mkdirat fs/namei.c:4152 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4152 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #3 (&ei->i_data_sem){++++}-{3:3}: down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 ext4_map_blocks+0x720/0x160c fs/ext4/inode.c:674 mpage_map_one_extent fs/ext4/inode.c:2436 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2489 [inline] ext4_writepages+0xdbc/0x28fc fs/ext4/inode.c:2857 do_writepages+0x2c4/0x50c mm/page-writeback.c:2491 __writeback_single_inode+0x164/0x157c fs/fs-writeback.c:1673 writeback_sb_inodes+0x870/0x1470 fs/fs-writeback.c:1964 __writeback_inodes_wb+0x104/0x370 fs/fs-writeback.c:2035 wb_writeback+0x420/0xfdc fs/fs-writeback.c:2140 wb_check_background_flush fs/fs-writeback.c:2206 [inline] wb_do_writeback fs/fs-writeback.c:2294 [inline] wb_workfn+0xb40/0xe18 fs/fs-writeback.c:2321 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439 kthread+0x254/0x2e0 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 -> #2 (jbd2_handle){++++}-{0:0}: wait_transaction_locked+0x184/0x23c fs/jbd2/transaction.c:177 add_transaction_credits+0x104/0xaf0 fs/jbd2/transaction.c:-1 start_this_handle+0x4dc/0x125c fs/jbd2/transaction.c:422 jbd2__journal_start+0x288/0x530 fs/jbd2/transaction.c:520 jbd2_journal_start+0x3c/0x4c fs/jbd2/transaction.c:559 ocfs2_start_trans+0x398/0x6f4 fs/ocfs2/journal.c:376 ocfs2_write_begin_nolock+0x2368/0x3a80 fs/ocfs2/aops.c:1772 ocfs2_dio_wr_get_block+0x784/0x1550 fs/ocfs2/aops.c:2241 get_more_blocks fs/direct-io.c:659 [inline] do_direct_IO fs/direct-io.c:947 [inline] __blockdev_direct_IO+0x10d4/0x31e0 fs/direct-io.c:1260 ocfs2_direct_IO+0x208/0x278 fs/ocfs2/aops.c:2488 generic_file_direct_write+0x104/0x2b4 mm/filemap.c:3787 __generic_file_write_iter+0x144/0x250 mm/filemap.c:3945 ocfs2_file_write_iter+0x13ac/0x1cd0 fs/ocfs2/file.c:2469 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x520/0x93c fs/read_write.c:861 vfs_iter_write+0x88/0xac fs/read_write.c:902 iter_file_splice_write+0x528/0xa38 fs/splice.c:685 do_splice_from fs/splice.c:763 [inline] direct_splice_actor+0xe4/0x138 fs/splice.c:950 splice_direct_to_actor+0x3ec/0x9e4 fs/splice.c:896 do_splice_direct+0x168/0x25c fs/splice.c:1002 do_sendfile+0x460/0xc8c fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64 fs/read_write.c:1309 [inline] __arm64_sys_sendfile64+0x138/0x374 fs/read_write.c:1309 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #1 (&journal->j_trans_barrier){.+.+}-{3:3}: down_read+0x64/0x300 kernel/locking/rwsem.c:1520 ocfs2_start_trans+0x38c/0x6f4 fs/ocfs2/journal.c:374 ocfs2_local_alloc_slide_window fs/ocfs2/localalloc.c:1258 [inline] ocfs2_reserve_local_alloc_bits+0xbb8/0x2830 fs/ocfs2/localalloc.c:668 ocfs2_reserve_clusters_with_limit+0x188/0xa3c fs/ocfs2/suballoc.c:1184 ocfs2_reserve_clusters+0x3c/0x50 fs/ocfs2/suballoc.c:1245 ocfs2_symlink+0xb0c/0x2158 fs/ocfs2/namei.c:1908 vfs_symlink+0x238/0x3b0 fs/namei.c:4479 do_symlinkat+0x178/0x35c fs/namei.c:4508 __do_sys_symlinkat fs/namei.c:4525 [inline] __se_sys_symlinkat fs/namei.c:4522 [inline] __arm64_sys_symlinkat+0xa4/0xbc fs/namei.c:4522 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #0 (sb_internal#3){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2808/0x6634 kernel/locking/lockdep.c:5063 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1891 [inline] sb_start_intwrite include/linux/fs.h:2013 [inline] ocfs2_start_trans+0x20c/0x6f4 fs/ocfs2/journal.c:372 ocfs2_acquire_dquot+0x5d0/0xab0 fs/ocfs2/quota_global.c:848 dqget+0x638/0xa98 fs/quota/dquot.c:1013 __dquot_initialize+0x2e4/0xb30 fs/quota/dquot.c:1542 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1604 ocfs2_get_init_inode+0x140/0x1b4 fs/ocfs2/namei.c:202 ocfs2_mknod+0x7d4/0x218c fs/ocfs2/namei.c:310 ocfs2_mkdir+0x19c/0x51c fs/ocfs2/namei.c:657 vfs_mkdir+0x314/0x4d8 fs/namei.c:4114 do_mkdirat+0x1b8/0x3ec fs/namei.c:4139 __do_sys_mkdirat fs/namei.c:4154 [inline] __se_sys_mkdirat fs/namei.c:4152 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4152 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 other info that might help us debug this: Chain exists of: sb_internal#3 --> &ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7 --> &ocfs2_quota_ip_alloc_sem_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ocfs2_quota_ip_alloc_sem_key); lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7); lock(&ocfs2_quota_ip_alloc_sem_key); lock(sb_internal#3); *** DEADLOCK *** 6 locks held by syz.7.433/7042: #0: ffff0000ff146460 (sb_writers#15){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:402 #1: ffff0000d76b2648 (&type->i_mutex_dir_key#9/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff0000d76b2648 (&type->i_mutex_dir_key#9/1){+.+.}-{3:3}, at: filename_create+0x1b0/0x3a8 fs/namei.c:3884 #2: ffff0000f5bd09c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #2: ffff0000f5bd09c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{3:3}, at: ocfs2_reserve_suballoc_bits+0x110/0x3d40 fs/ocfs2/suballoc.c:804 #3: ffff0000f97980a8 (&dquot->dq_lock){+.+.}-{3:3}, at: ocfs2_acquire_dquot+0x254/0xab0 fs/ocfs2/quota_global.c:811 #4: ffff0000d76b5f48 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #4: ffff0000d76b5f48 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7){+.+.}-{3:3}, at: ocfs2_lock_global_qf+0x190/0x23c fs/ocfs2/quota_global.c:313 #5: ffff0000d76b5be0 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_lock_global_qf+0x1ac/0x23c fs/ocfs2/quota_global.c:314 stack backtrace: CPU: 0 PID: 7042 Comm: syz.7.433 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2048 check_noncircular+0x264/0x2f8 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2808/0x6634 kernel/locking/lockdep.c:5063 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1891 [inline] sb_start_intwrite include/linux/fs.h:2013 [inline] ocfs2_start_trans+0x20c/0x6f4 fs/ocfs2/journal.c:372 ocfs2_acquire_dquot+0x5d0/0xab0 fs/ocfs2/quota_global.c:848 dqget+0x638/0xa98 fs/quota/dquot.c:1013 __dquot_initialize+0x2e4/0xb30 fs/quota/dquot.c:1542 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1604 ocfs2_get_init_inode+0x140/0x1b4 fs/ocfs2/namei.c:202 ocfs2_mknod+0x7d4/0x218c fs/ocfs2/namei.c:310 ocfs2_mkdir+0x19c/0x51c fs/ocfs2/namei.c:657 vfs_mkdir+0x314/0x4d8 fs/namei.c:4114 do_mkdirat+0x1b8/0x3ec fs/namei.c:4139 __do_sys_mkdirat fs/namei.c:4154 [inline] __se_sys_mkdirat fs/namei.c:4152 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4152 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585