ext4 filesystem being mounted at /1145/file1 supports timestamps until 2038-01-19 (0x7fffffff) ====================================================== WARNING: possible circular locking dependency detected 6.6.94-syzkaller #0 Not tainted ------------------------------------------------------ syz.2.4748/17055 is trying to acquire lock: ffff88805b2635a8 (&dquot->dq_lock){+.+.}-{3:3}, at: wait_on_dquot fs/quota/dquot.c:356 [inline] ffff88805b2635a8 (&dquot->dq_lock){+.+.}-{3:3}, at: dqget+0x6fc/0xeb0 fs/quota/dquot.c:983 but task is already holding lock: ffff8880591d94c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_setattr+0x86b/0x1c90 fs/ext4/inode.c:5470 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&ei->xattr_sem){++++}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 ext4_setattr+0x86b/0x1c90 fs/ext4/inode.c:5470 notify_change+0xb0d/0xe10 fs/attr.c:499 chown_common+0x3f9/0x5a0 fs/open.c:783 do_fchownat+0x168/0x270 fs/open.c:814 __do_sys_chown fs/open.c:834 [inline] __se_sys_chown fs/open.c:832 [inline] __x64_sys_chown+0x82/0x90 fs/open.c:832 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #4 (jbd2_handle){++++}-{0:0}: start_this_handle+0x1e9d/0x20c0 fs/jbd2/transaction.c:448 jbd2__journal_start+0x2bb/0x5b0 fs/jbd2/transaction.c:505 jbd2_journal_start+0x2a/0x40 fs/jbd2/transaction.c:544 ocfs2_start_trans+0x376/0x6c0 fs/ocfs2/journal.c:374 ocfs2_shutdown_local_alloc+0x201/0xa10 fs/ocfs2/localalloc.c:416 ocfs2_dismount_volume+0x1e2/0x890 fs/ocfs2/super.c:1883 generic_shutdown_super+0x134/0x2b0 fs/super.c:693 kill_block_super+0x44/0x90 fs/super.c:1660 deactivate_locked_super+0x97/0x100 fs/super.c:481 cleanup_mnt+0x429/0x4c0 fs/namespace.c:1250 task_work_run+0x1ce/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 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:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #3 (&journal->j_trans_barrier){.+.+}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 ocfs2_start_trans+0x36a/0x6c0 fs/ocfs2/journal.c:372 ocfs2_shutdown_local_alloc+0x201/0xa10 fs/ocfs2/localalloc.c:416 ocfs2_dismount_volume+0x1e2/0x890 fs/ocfs2/super.c:1883 generic_shutdown_super+0x134/0x2b0 fs/super.c:693 kill_block_super+0x44/0x90 fs/super.c:1660 deactivate_locked_super+0x97/0x100 fs/super.c:481 cleanup_mnt+0x429/0x4c0 fs/namespace.c:1250 task_work_run+0x1ce/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 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:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #2 (sb_internal#4){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1633 [inline] sb_start_intwrite include/linux/fs.h:1755 [inline] ocfs2_start_trans+0x26b/0x6c0 fs/ocfs2/journal.c:370 ocfs2_acquire_dquot+0x67b/0xaf0 fs/ocfs2/quota_global.c:848 dqget+0x77c/0xeb0 fs/quota/dquot.c:988 __dquot_initialize+0x3ba/0xcb0 fs/quota/dquot.c:1516 ocfs2_get_init_inode+0x13c/0x1b0 fs/ocfs2/namei.c:202 ocfs2_mknod+0x867/0x20f0 fs/ocfs2/namei.c:310 ocfs2_create+0x196/0x410 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3488 [inline] open_last_lookups fs/namei.c:3556 [inline] path_openat+0x1277/0x3190 fs/namei.c:3786 do_filp_open+0x1c5/0x3d0 fs/namei.c:3816 do_sys_openat2+0x12c/0x1c0 fs/open.c:1419 do_sys_open fs/open.c:1434 [inline] __do_sys_openat fs/open.c:1450 [inline] __se_sys_openat fs/open.c:1445 [inline] __x64_sys_openat+0x139/0x160 fs/open.c:1445 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}: down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 ocfs2_create_local_dquot+0x1a4/0x1790 fs/ocfs2/quota_local.c:1224 ocfs2_acquire_dquot+0x7cf/0xaf0 fs/ocfs2/quota_global.c:871 dqget+0x77c/0xeb0 fs/quota/dquot.c:988 __dquot_initialize+0x3ba/0xcb0 fs/quota/dquot.c:1516 ocfs2_get_init_inode+0x13c/0x1b0 fs/ocfs2/namei.c:202 ocfs2_mknod+0x867/0x20f0 fs/ocfs2/namei.c:310 ocfs2_create+0x196/0x410 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3488 [inline] open_last_lookups fs/namei.c:3556 [inline] path_openat+0x1277/0x3190 fs/namei.c:3786 do_filp_open+0x1c5/0x3d0 fs/namei.c:3816 do_sys_openat2+0x12c/0x1c0 fs/open.c:1419 do_sys_open fs/open.c:1434 [inline] __do_sys_openat fs/open.c:1450 [inline] __se_sys_openat fs/open.c:1445 [inline] __x64_sys_openat+0x139/0x160 fs/open.c:1445 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&dquot->dq_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x129/0xcc0 kernel/locking/mutex.c:747 wait_on_dquot fs/quota/dquot.c:356 [inline] dqget+0x6fc/0xeb0 fs/quota/dquot.c:983 dquot_transfer+0x2f9/0x6d0 fs/quota/dquot.c:2149 ext4_setattr+0x87d/0x1c90 fs/ext4/inode.c:5471 notify_change+0xb0d/0xe10 fs/attr.c:499 chown_common+0x3f9/0x5a0 fs/open.c:783 do_fchownat+0x168/0x270 fs/open.c:814 __do_sys_lchown fs/open.c:839 [inline] __se_sys_lchown fs/open.c:837 [inline] __x64_sys_lchown+0x85/0x90 fs/open.c:837 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 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 ---- ---- rlock(&ei->xattr_sem); lock(jbd2_handle); lock(&ei->xattr_sem); lock(&dquot->dq_lock); *** DEADLOCK *** 3 locks held by syz.2.4748/17055: #0: ffff8880579a8418 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:403 #1: ffff8880591d9810 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #1: ffff8880591d9810 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: chown_common+0x313/0x5a0 fs/open.c:773 #2: ffff8880591d94c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_setattr+0x86b/0x1c90 fs/ext4/inode.c:5470 stack backtrace: CPU: 1 PID: 17055 Comm: syz.2.4748 Not tainted 6.6.94-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x129/0xcc0 kernel/locking/mutex.c:747 wait_on_dquot fs/quota/dquot.c:356 [inline] dqget+0x6fc/0xeb0 fs/quota/dquot.c:983 dquot_transfer+0x2f9/0x6d0 fs/quota/dquot.c:2149 ext4_setattr+0x87d/0x1c90 fs/ext4/inode.c:5471 notify_change+0xb0d/0xe10 fs/attr.c:499 chown_common+0x3f9/0x5a0 fs/open.c:783 do_fchownat+0x168/0x270 fs/open.c:814 __do_sys_lchown fs/open.c:839 [inline] __se_sys_lchown fs/open.c:837 [inline] __x64_sys_lchown+0x85/0x90 fs/open.c:837 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f7c5778e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7c586b8038 EFLAGS: 00000246 ORIG_RAX: 000000000000005e RAX: ffffffffffffffda RBX: 00007f7c579b5fa0 RCX: 00007f7c5778e929 RDX: 0000000000000000 RSI: 000000000000ee01 RDI: 0000200000000000 RBP: 00007f7c57810b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f7c579b5fa0 R15: 00007fffde08c8b8