======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.4.270/8003 is trying to acquire lock:
ffff0000ce8b80a8 (&dquot->dq_lock){+.+.}-{4:4}, at: wait_on_dquot fs/quota/dquot.c:354 [inline]
ffff0000ce8b80a8 (&dquot->dq_lock){+.+.}-{4:4}, at: dqget+0x5e4/0xccc fs/quota/dquot.c:972

but task is already holding lock:
ffff0000dda943b8 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline]
ffff0000dda943b8 (&ei->xattr_sem){++++}-{4:4}, at: ext4_xattr_set_handle+0x11c/0x1260 fs/ext4/xattr.c:2362

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #5 (&ei->xattr_sem){++++}-{4:4}:
       down_write+0x50/0xc0 kernel/locking/rwsem.c:1590
       ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline]
       ext4_xattr_set_handle+0x11c/0x1260 fs/ext4/xattr.c:2362
       ext4_initxattrs+0xa4/0x11c fs/ext4/xattr_security.c:44
       security_inode_init_security+0x6dc/0x7f4 security/security.c:1852
       ext4_init_security+0x44/0x58 fs/ext4/xattr_security.c:58
       __ext4_new_inode+0x27f4/0x3190 fs/ext4/ialloc.c:1325
       ext4_create+0x1f8/0x3fc fs/ext4/namei.c:2822
       lookup_open fs/namei.c:3708 [inline]
       open_last_lookups fs/namei.c:3807 [inline]
       path_openat+0x12d8/0x2c40 fs/namei.c:4043
       do_filp_open+0x18c/0x36c fs/namei.c:4073
       do_sys_openat2+0x11c/0x1b4 fs/open.c:1435
       do_sys_open fs/open.c:1450 [inline]
       __do_sys_openat fs/open.c:1466 [inline]
       __se_sys_openat fs/open.c:1461 [inline]
       __arm64_sys_openat+0x120/0x158 fs/open.c:1461
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
       do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
       el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744
       el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

-> #4 (jbd2_handle){++++}-{0:0}:
       start_this_handle+0xe74/0x10dc fs/jbd2/transaction.c:444
       jbd2__journal_start+0x288/0x51c fs/jbd2/transaction.c:501
       jbd2_journal_start+0x3c/0x4c fs/jbd2/transaction.c:540
       ocfs2_start_trans+0x368/0x6b0 fs/ocfs2/journal.c:374
       ocfs2_shutdown_local_alloc+0x1ac/0x7e4 fs/ocfs2/localalloc.c:417
       ocfs2_dismount_volume+0x1ec/0x8cc fs/ocfs2/super.c:1825
       ocfs2_put_super+0xec/0x320 fs/ocfs2/super.c:1553
       generic_shutdown_super+0x12c/0x2b8 fs/super.c:643
       kill_block_super+0x44/0x90 fs/super.c:1766
       deactivate_locked_super+0xc4/0x12c fs/super.c:474
       deactivate_super+0xe0/0x100 fs/super.c:507
       cleanup_mnt+0x31c/0x3ac fs/namespace.c:1375
       __cleanup_mnt+0x20/0x30 fs/namespace.c:1382
       task_work_run+0x1dc/0x260 kernel/task_work.c:227
       resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
       exit_to_user_mode_loop+0xfc/0x168 kernel/entry/common.c:43
       exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
       arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:103 [inline]
       el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:745
       el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

-> #3 (&journal->j_trans_barrier){.+.+}-{4:4}:
       down_read+0x58/0x2f8 kernel/locking/rwsem.c:1537
       ocfs2_start_trans+0x35c/0x6b0 fs/ocfs2/journal.c:372
       ocfs2_shutdown_local_alloc+0x1ac/0x7e4 fs/ocfs2/localalloc.c:417
       ocfs2_dismount_volume+0x1ec/0x8cc fs/ocfs2/super.c:1825
       ocfs2_put_super+0xec/0x320 fs/ocfs2/super.c:1553
       generic_shutdown_super+0x12c/0x2b8 fs/super.c:643
       kill_block_super+0x44/0x90 fs/super.c:1766
       deactivate_locked_super+0xc4/0x12c fs/super.c:474
       deactivate_super+0xe0/0x100 fs/super.c:507
       cleanup_mnt+0x31c/0x3ac fs/namespace.c:1375
       __cleanup_mnt+0x20/0x30 fs/namespace.c:1382
       task_work_run+0x1dc/0x260 kernel/task_work.c:227
       resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
       exit_to_user_mode_loop+0xfc/0x168 kernel/entry/common.c:43
       exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
       arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:103 [inline]
       el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:745
       el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

-> #2 (sb_internal#4){.+.+}-{0:0}:
       percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
       percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
       __sb_start_write include/linux/fs.h:1799 [inline]
       sb_start_intwrite include/linux/fs.h:1982 [inline]
       ocfs2_start_trans+0x1f4/0x6b0 fs/ocfs2/journal.c:370
       ocfs2_acquire_dquot+0x594/0xa10 fs/ocfs2/quota_global.c:860
       dqget+0x654/0xccc fs/quota/dquot.c:977
       __dquot_initialize+0x2d4/0xa80 fs/quota/dquot.c:1505
       dquot_initialize+0x24/0x34 fs/quota/dquot.c:1567
       ocfs2_get_init_inode+0x134/0x1a8 fs/ocfs2/namei.c:205
       ocfs2_mknod+0x734/0x1cf0 fs/ocfs2/namei.c:313
       ocfs2_create+0x190/0x474 fs/ocfs2/namei.c:676
       lookup_open fs/namei.c:3708 [inline]
       open_last_lookups fs/namei.c:3807 [inline]
       path_openat+0x12d8/0x2c40 fs/namei.c:4043
       do_filp_open+0x18c/0x36c fs/namei.c:4073
       do_sys_openat2+0x11c/0x1b4 fs/open.c:1435
       do_sys_open fs/open.c:1450 [inline]
       __do_sys_openat fs/open.c:1466 [inline]
       __se_sys_openat fs/open.c:1461 [inline]
       __arm64_sys_openat+0x120/0x158 fs/open.c:1461
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
       do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
       el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744
       el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

-> #1 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}:
       down_write+0x50/0xc0 kernel/locking/rwsem.c:1590
       ocfs2_create_local_dquot+0x164/0x1444 fs/ocfs2/quota_local.c:1227
       ocfs2_acquire_dquot+0x6a8/0xa10 fs/ocfs2/quota_global.c:883
       dqget+0x654/0xccc fs/quota/dquot.c:977
       __dquot_initialize+0x2d4/0xa80 fs/quota/dquot.c:1505
       dquot_initialize+0x24/0x34 fs/quota/dquot.c:1567
       ocfs2_get_init_inode+0x134/0x1a8 fs/ocfs2/namei.c:205
       ocfs2_mknod+0x734/0x1cf0 fs/ocfs2/namei.c:313
       ocfs2_create+0x190/0x474 fs/ocfs2/namei.c:676
       lookup_open fs/namei.c:3708 [inline]
       open_last_lookups fs/namei.c:3807 [inline]
       path_openat+0x12d8/0x2c40 fs/namei.c:4043
       do_filp_open+0x18c/0x36c fs/namei.c:4073
       do_sys_openat2+0x11c/0x1b4 fs/open.c:1435
       do_sys_open fs/open.c:1450 [inline]
       __do_sys_openat fs/open.c:1466 [inline]
       __se_sys_openat fs/open.c:1461 [inline]
       __arm64_sys_openat+0x120/0x158 fs/open.c:1461
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
       do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
       el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744
       el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

-> #0 (&dquot->dq_lock){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237
       lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
       __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:598
       __mutex_lock kernel/locking/mutex.c:760 [inline]
       mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812
       wait_on_dquot fs/quota/dquot.c:354 [inline]
       dqget+0x5e4/0xccc fs/quota/dquot.c:972
       __dquot_initialize+0x2d4/0xa80 fs/quota/dquot.c:1505
       dquot_initialize+0x24/0x34 fs/quota/dquot.c:1567
       __ext4_new_inode+0x618/0x3190 fs/ext4/ialloc.c:994
       ext4_xattr_inode_create fs/ext4/xattr.c:1478 [inline]
       ext4_xattr_inode_lookup_create+0x82c/0x1768 fs/ext4/xattr.c:1588
       ext4_xattr_block_set+0x1bc/0x24bc fs/ext4/xattr.c:1908
       ext4_xattr_set_handle+0xde8/0x1260 fs/ext4/xattr.c:2447
       ext4_xattr_set+0x1e4/0x2b8 fs/ext4/xattr.c:2549
       ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
       __vfs_setxattr+0x3d8/0x400 fs/xattr.c:200
       __vfs_setxattr_noperm+0x120/0x5c4 fs/xattr.c:234
       __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:295
       vfs_setxattr+0x158/0x2ac fs/xattr.c:321
       do_setxattr fs/xattr.c:636 [inline]
       filename_setxattr+0x20c/0x4f8 fs/xattr.c:665
       path_setxattrat+0x2e8/0x320 fs/xattr.c:713
       __do_sys_setxattr fs/xattr.c:747 [inline]
       __se_sys_setxattr fs/xattr.c:743 [inline]
       __arm64_sys_setxattr+0xc0/0xdc fs/xattr.c:743
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
       do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
       el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744
       el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

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.4.270/8003:
 #0: ffff0000cf328428 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:557
 #1: ffff0000dda946d0 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: inode_lock include/linux/fs.h:870 [inline]
 #1: ffff0000dda946d0 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: vfs_setxattr+0x138/0x2ac fs/xattr.c:320
 #2: ffff0000dda943b8 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline]
 #2: ffff0000dda943b8 (&ei->xattr_sem){++++}-{4:4}, at: ext4_xattr_set_handle+0x11c/0x1260 fs/ext4/xattr.c:2362

stack backtrace:
CPU: 0 UID: 0 PID: 8003 Comm: syz.4.270 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2043
 check_noncircular+0x154/0x174 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237
 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
 __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:598
 __mutex_lock kernel/locking/mutex.c:760 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812
 wait_on_dquot fs/quota/dquot.c:354 [inline]
 dqget+0x5e4/0xccc fs/quota/dquot.c:972
 __dquot_initialize+0x2d4/0xa80 fs/quota/dquot.c:1505
 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1567
 __ext4_new_inode+0x618/0x3190 fs/ext4/ialloc.c:994
 ext4_xattr_inode_create fs/ext4/xattr.c:1478 [inline]
 ext4_xattr_inode_lookup_create+0x82c/0x1768 fs/ext4/xattr.c:1588
 ext4_xattr_block_set+0x1bc/0x24bc fs/ext4/xattr.c:1908
 ext4_xattr_set_handle+0xde8/0x1260 fs/ext4/xattr.c:2447
 ext4_xattr_set+0x1e4/0x2b8 fs/ext4/xattr.c:2549
 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
 __vfs_setxattr+0x3d8/0x400 fs/xattr.c:200
 __vfs_setxattr_noperm+0x120/0x5c4 fs/xattr.c:234
 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:295
 vfs_setxattr+0x158/0x2ac fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 filename_setxattr+0x20c/0x4f8 fs/xattr.c:665
 path_setxattrat+0x2e8/0x320 fs/xattr.c:713
 __do_sys_setxattr fs/xattr.c:747 [inline]
 __se_sys_setxattr fs/xattr.c:743 [inline]
 __arm64_sys_setxattr+0xc0/0xdc fs/xattr.c:743
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596