loop0: detected capacity change from 0 to 512 EXT4-fs (loop0): mounted filesystem without journal. Quota mode: writeback. ====================================================== WARNING: possible circular locking dependency detected 6.1.148-syzkaller #0 Not tainted ------------------------------------------------------ syz.0.8807/23855 is trying to acquire lock: ffff0000fb9dece8 (&dquot->dq_lock){+.+.}-{3:3}, at: wait_on_dquot fs/quota/dquot.c:356 [inline] ffff0000fb9dece8 (&dquot->dq_lock){+.+.}-{3:3}, at: dqget+0x5e4/0xccc fs/quota/dquot.c:983 but task is already holding lock: ffff0000e260e518 (&ei->xattr_sem){++++}-{3:3}, at: ext4_setattr+0x7c4/0x150c fs/ext4/inode.c:5501 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&ei->xattr_sem){++++}-{3:3}: down_read+0x64/0x304 kernel/locking/rwsem.c:1520 ext4_setattr+0x7c4/0x150c fs/ext4/inode.c:5501 notify_change+0xb0c/0xdcc fs/attr.c:499 chown_common+0x414/0x574 fs/open.c:736 do_fchownat+0x158/0x268 fs/open.c:767 __do_sys_fchownat fs/open.c:782 [inline] __se_sys_fchownat fs/open.c:779 [inline] __arm64_sys_fchownat+0xb8/0xd4 fs/open.c:779 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 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 (jbd2_handle){++++}-{0:0}: start_this_handle+0xfe0/0x122c fs/jbd2/transaction.c:463 jbd2__journal_start+0x288/0x51c fs/jbd2/transaction.c:520 jbd2_journal_start+0x3c/0x4c fs/jbd2/transaction.c:559 ocfs2_start_trans+0x380/0x6c4 fs/ocfs2/journal.c:376 ocfs2_shutdown_local_alloc+0x1ac/0x7e4 fs/ocfs2/localalloc.c:416 ocfs2_dismount_volume+0x1f0/0x93c fs/ocfs2/super.c:1882 ocfs2_put_super+0x108/0x390 fs/ocfs2/super.c:1609 generic_shutdown_super+0x130/0x324 fs/super.c:501 kill_block_super+0x70/0xdc fs/super.c:1470 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xe8/0x108 fs/super.c:363 cleanup_mnt+0x37c/0x404 fs/namespace.c:1182 __cleanup_mnt+0x20/0x30 fs/namespace.c:1189 task_work_run+0x1ec/0x270 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x1f70/0x2b0c arch/arm64/kernel/signal.c:1137 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x98/0x138 arch/arm64/kernel/entry-common.c:638 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 (&journal->j_trans_barrier){.+.+}-{3:3}: down_read+0x64/0x304 kernel/locking/rwsem.c:1520 ocfs2_start_trans+0x374/0x6c4 fs/ocfs2/journal.c:374 ocfs2_shutdown_local_alloc+0x1ac/0x7e4 fs/ocfs2/localalloc.c:416 ocfs2_dismount_volume+0x1f0/0x93c fs/ocfs2/super.c:1882 ocfs2_put_super+0x108/0x390 fs/ocfs2/super.c:1609 generic_shutdown_super+0x130/0x324 fs/super.c:501 kill_block_super+0x70/0xdc fs/super.c:1470 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xe8/0x108 fs/super.c:363 cleanup_mnt+0x37c/0x404 fs/namespace.c:1182 __cleanup_mnt+0x20/0x30 fs/namespace.c:1189 task_work_run+0x1ec/0x270 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x1f70/0x2b0c arch/arm64/kernel/signal.c:1137 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x98/0x138 arch/arm64/kernel/entry-common.c:638 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 (sb_internal#3){.+.+}-{0:0}: 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/0x6c4 fs/ocfs2/journal.c:372 ocfs2_acquire_dquot+0x5bc/0xac4 fs/ocfs2/quota_global.c:848 dqget+0x654/0xccc fs/quota/dquot.c:988 ocfs2_setattr+0xc20/0x18d4 fs/ocfs2/file.c:1233 notify_change+0xb0c/0xdcc fs/attr.c:499 chown_common+0x414/0x574 fs/open.c:736 do_fchownat+0x158/0x268 fs/open.c:767 __do_sys_fchownat fs/open.c:782 [inline] __se_sys_fchownat fs/open.c:779 [inline] __arm64_sys_fchownat+0xb8/0xd4 fs/open.c:779 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 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 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}: down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 ocfs2_create_local_dquot+0x15c/0x1330 fs/ocfs2/quota_local.c:1224 ocfs2_acquire_dquot+0x6e8/0xac4 fs/ocfs2/quota_global.c:871 dqget+0x654/0xccc fs/quota/dquot.c:988 ocfs2_setattr+0xc20/0x18d4 fs/ocfs2/file.c:1233 notify_change+0xb0c/0xdcc fs/attr.c:499 chown_common+0x414/0x574 fs/open.c:736 do_fchownat+0x158/0x268 fs/open.c:767 __do_sys_fchownat fs/open.c:782 [inline] __se_sys_fchownat fs/open.c:779 [inline] __arm64_sys_fchownat+0xb8/0xd4 fs/open.c:779 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 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 (&dquot->dq_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x293c/0x6544 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662 __mutex_lock_common+0x190/0x1f38 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 wait_on_dquot fs/quota/dquot.c:356 [inline] dqget+0x5e4/0xccc fs/quota/dquot.c:983 dquot_transfer+0x52c/0x6f0 fs/quota/dquot.c:2164 ext4_setattr+0x7d4/0x150c fs/ext4/inode.c:5502 notify_change+0xb0c/0xdcc fs/attr.c:499 chown_common+0x414/0x574 fs/open.c:736 do_fchownat+0x158/0x268 fs/open.c:767 __do_sys_fchownat fs/open.c:782 [inline] __se_sys_fchownat fs/open.c:779 [inline] __arm64_sys_fchownat+0xb8/0xd4 fs/open.c:779 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 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: &dquot->dq_lock --> jbd2_handle --> &ei->xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->xattr_sem); lock(jbd2_handle); lock(&ei->xattr_sem); lock(&dquot->dq_lock); *** DEADLOCK *** 3 locks held by syz.0.8807/23855: #0: ffff0000ecba8460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:393 #1: ffff0000e260e850 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff0000e260e850 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: chown_common+0x2ac/0x574 fs/open.c:726 #2: ffff0000e260e518 (&ei->xattr_sem){++++}-{3:3}, at: ext4_setattr+0x7c4/0x150c fs/ext4/inode.c:5501 stack backtrace: CPU: 0 PID: 23855 Comm: syz.0.8807 Not tainted 6.1.148-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Call trace: dump_backtrace+0x1c8/0x1f4 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+0xf8/0x160 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+0x240/0x2d4 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 kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x293c/0x6544 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662 __mutex_lock_common+0x190/0x1f38 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 wait_on_dquot fs/quota/dquot.c:356 [inline] dqget+0x5e4/0xccc fs/quota/dquot.c:983 dquot_transfer+0x52c/0x6f0 fs/quota/dquot.c:2164 ext4_setattr+0x7d4/0x150c fs/ext4/inode.c:5502 notify_change+0xb0c/0xdcc fs/attr.c:499 chown_common+0x414/0x574 fs/open.c:736 do_fchownat+0x158/0x268 fs/open.c:767 __do_sys_fchownat fs/open.c:782 [inline] __se_sys_fchownat fs/open.c:779 [inline] __arm64_sys_fchownat+0xb8/0xd4 fs/open.c:779 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 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