====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz-executor/4938 is trying to acquire lock: ffff0000cb298990 (jbd2_handle){++++}-{0:0}, at: wait_transaction_locked+0x15c/0x23c fs/jbd2/transaction.c:176 but task is already holding lock: ffff0000f545d0e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x38c/0x6f4 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+0x64/0x300 kernel/locking/rwsem.c:1520 ocfs2_start_trans+0x38c/0x6f4 fs/ocfs2/journal.c:374 ocfs2_modify_bh+0xd8/0x44c fs/ocfs2/quota_local.c:101 ocfs2_local_read_info+0x1054/0x13c4 fs/ocfs2/quota_local.c:764 dquot_load_quota_sb+0x68c/0x998 fs/quota/dquot.c:2495 dquot_load_quota_inode+0x274/0x4dc fs/quota/dquot.c:2532 ocfs2_enable_quotas+0x17c/0x3c4 fs/ocfs2/super.c:926 ocfs2_fill_super+0x32f8/0x417c fs/ocfs2/super.c:1139 mount_bdev+0x264/0x35c fs/super.c:1454 ocfs2_mount+0x44/0x58 fs/ocfs2/super.c:1186 legacy_get_tree+0xd8/0x174 fs/fs_context.c:632 vfs_get_tree+0x90/0x278 fs/super.c:1584 do_new_mount+0x228/0x804 fs/namespace.c:3078 path_mount+0x5ac/0xe6c fs/namespace.c:3408 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount fs/namespace.c:3606 [inline] __arm64_sys_mount+0x4a0/0x5a0 fs/namespace.c:3606 __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+0x58/0x12c 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 (sb_internal#4){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1897 [inline] sb_start_intwrite include/linux/fs.h:2019 [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+0x7f8/0x212c fs/ocfs2/namei.c:311 ocfs2_mkdir+0x19c/0x51c fs/ocfs2/namei.c:659 vfs_mkdir+0x314/0x4d8 fs/namei.c:4157 do_mkdirat+0x1b8/0x3ec fs/namei.c:4182 __do_sys_mkdirat fs/namei.c:4197 [inline] __se_sys_mkdirat fs/namei.c:4195 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4195 __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+0x58/0x12c 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 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}: down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 ocfs2_create_local_dquot+0x140/0x1444 fs/ocfs2/quota_local.c:1224 ocfs2_acquire_dquot+0x6dc/0xab0 fs/ocfs2/quota_global.c:871 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+0x7f8/0x212c fs/ocfs2/namei.c:311 ocfs2_mkdir+0x19c/0x51c fs/ocfs2/namei.c:659 vfs_mkdir+0x314/0x4d8 fs/namei.c:4157 do_mkdirat+0x1b8/0x3ec fs/namei.c:4182 __do_sys_mkdirat fs/namei.c:4197 [inline] __se_sys_mkdirat fs/namei.c:4195 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4195 __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+0x58/0x12c 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 -> #2 (&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:3032 ext4_mkdir+0x3b8/0xa28 fs/ext4/namei.c:3078 vfs_mkdir+0x314/0x4d8 fs/namei.c:4157 do_mkdirat+0x1b8/0x3ec fs/namei.c:4182 __do_sys_mkdirat fs/namei.c:4197 [inline] __se_sys_mkdirat fs/namei.c:4195 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4195 __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+0x58/0x12c 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 (&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:1688 writeback_sb_inodes+0x870/0x1470 fs/fs-writeback.c:1979 __writeback_inodes_wb+0x104/0x370 fs/fs-writeback.c:2050 wb_writeback+0x420/0xfdc fs/fs-writeback.c:2155 wb_check_background_flush fs/fs-writeback.c:2221 [inline] wb_do_writeback fs/fs-writeback.c:2309 [inline] wb_workfn+0xb40/0xe18 fs/fs-writeback.c:2336 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 -> #0 (jbd2_handle){++++}-{0:0}: check_prev_add kernel/locking/lockdep.c:3162 [inline] check_prevs_add kernel/locking/lockdep.c:3281 [inline] validate_chain kernel/locking/lockdep.c:3897 [inline] __lock_acquire+0x3504/0x7280 kernel/locking/lockdep.c:5171 lock_acquire+0x210/0x63c kernel/locking/lockdep.c:5790 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_remove_btree_range+0x6b0/0x12e8 fs/ocfs2/alloc.c:5752 ocfs2_commit_truncate+0x880/0x1980 fs/ocfs2/alloc.c:7353 ocfs2_truncate_for_delete fs/ocfs2/inode.c:656 [inline] ocfs2_wipe_inode fs/ocfs2/inode.c:823 [inline] ocfs2_delete_inode fs/ocfs2/inode.c:1112 [inline] ocfs2_evict_inode+0x15fc/0x3df0 fs/ocfs2/inode.c:1252 evict+0x3d8/0x824 fs/inode.c:705 iput_final fs/inode.c:1834 [inline] iput+0x728/0x7e8 fs/inode.c:1860 do_unlinkat+0x35c/0x504 fs/namei.c:4448 __do_sys_unlinkat fs/namei.c:4484 [inline] __se_sys_unlinkat fs/namei.c:4477 [inline] __arm64_sys_unlinkat+0xe0/0xfc fs/namei.c:4477 __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+0x58/0x12c 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: jbd2_handle --> sb_internal#4 --> &journal->j_trans_barrier Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&journal->j_trans_barrier); lock(sb_internal#4); lock(&journal->j_trans_barrier); lock(jbd2_handle); *** DEADLOCK *** 6 locks held by syz-executor/4938: #0: ffff0000f9d06460 (sb_writers#17){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:402 #1: ffff0000f4adcab0 (&osb->nfs_sync_rwlock){++++}-{3:3}, at: ocfs2_nfs_sync_lock+0xf4/0x254 fs/ocfs2/dlmglue.c:2874 #2: ffff0000f59609c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:764 [inline] #2: ffff0000f59609c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]){+.+.}-{3:3}, at: ocfs2_wipe_inode fs/ocfs2/inode.c:809 [inline] #2: ffff0000f59609c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]){+.+.}-{3:3}, at: ocfs2_delete_inode fs/ocfs2/inode.c:1112 [inline] #2: ffff0000f59609c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]){+.+.}-{3:3}, at: ocfs2_evict_inode+0x1408/0x3df0 fs/ocfs2/inode.c:1252 #3: ffff0000fa89d108 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:764 [inline] #3: ffff0000fa89d108 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7){+.+.}-{3:3}, at: ocfs2_remove_btree_range+0x56c/0x12e8 fs/ocfs2/alloc.c:5742 #4: ffff0000f9d06650 (sb_internal#4){.+.+}-{0:0}, at: ocfs2_remove_btree_range+0x6b0/0x12e8 fs/ocfs2/alloc.c:5752 #5: ffff0000f545d0e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x38c/0x6f4 fs/ocfs2/journal.c:374 stack backtrace: CPU: 0 PID: 4938 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 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:2088 check_noncircular+0x290/0x370 kernel/locking/lockdep.c:2215 check_prev_add kernel/locking/lockdep.c:3162 [inline] check_prevs_add kernel/locking/lockdep.c:3281 [inline] validate_chain kernel/locking/lockdep.c:3897 [inline] __lock_acquire+0x3504/0x7280 kernel/locking/lockdep.c:5171 lock_acquire+0x210/0x63c kernel/locking/lockdep.c:5790 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_remove_btree_range+0x6b0/0x12e8 fs/ocfs2/alloc.c:5752 ocfs2_commit_truncate+0x880/0x1980 fs/ocfs2/alloc.c:7353 ocfs2_truncate_for_delete fs/ocfs2/inode.c:656 [inline] ocfs2_wipe_inode fs/ocfs2/inode.c:823 [inline] ocfs2_delete_inode fs/ocfs2/inode.c:1112 [inline] ocfs2_evict_inode+0x15fc/0x3df0 fs/ocfs2/inode.c:1252 evict+0x3d8/0x824 fs/inode.c:705 iput_final fs/inode.c:1834 [inline] iput+0x728/0x7e8 fs/inode.c:1860 do_unlinkat+0x35c/0x504 fs/namei.c:4448 __do_sys_unlinkat fs/namei.c:4484 [inline] __se_sys_unlinkat fs/namei.c:4477 [inline] __arm64_sys_unlinkat+0xe0/0xfc fs/namei.c:4477 __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+0x58/0x12c 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 ocfs2: Unmounting device (7,8) on (node local)