EXT4-fs: Journaled quota options ignored when QUOTA feature is enabled
EXT4-fs (loop0): mounted filesystem without journal. Quota mode: writeback.
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.24/4519 is trying to acquire lock:
ffff0000e533ef20 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_get+0xec/0x554 fs/ext4/xattr.c:654

but task is already holding lock:
ffff0000eb7bac18 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0x208/0xbf8 fs/ext4/migrate.c:437

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&sbi->s_writepages_rwsem){++++}-{0:0}:
       percpu_down_read+0x70/0x2a8 include/linux/percpu-rwsem.h:51
       ext4_writepages+0x1b0/0x28fc fs/ext4/inode.c:2717
       do_writepages+0x2c4/0x50c mm/page-writeback.c:2491
       __writeback_single_inode+0x164/0x157c fs/fs-writeback.c:1673
       writeback_single_inode+0x1cc/0x73c fs/fs-writeback.c:1794
       write_inode_now+0x150/0x1cc fs/fs-writeback.c:2837
       iput_final fs/inode.c:1821 [inline]
       iput+0x5b8/0x7e8 fs/inode.c:1860
       ext4_xattr_block_set+0x1474/0x28b4 fs/ext4/xattr.c:2148
       ext4_xattr_move_to_block fs/ext4/xattr.c:2613 [inline]
       ext4_xattr_make_inode_space fs/ext4/xattr.c:2688 [inline]
       ext4_expand_extra_isize_ea+0xea4/0x1818 fs/ext4/xattr.c:2776
       __ext4_expand_extra_isize+0x2a0/0x364 fs/ext4/inode.c:6003
       ext4_try_to_expand_extra_isize fs/ext4/inode.c:6046 [inline]
       __ext4_mark_inode_dirty+0x3d4/0x7b4 fs/ext4/inode.c:6124
       ext4_evict_inode+0xb50/0x1264 fs/ext4/inode.c:281
       evict+0x3d8/0x824 fs/inode.c:705
       iput_final fs/inode.c:1834 [inline]
       iput+0x728/0x7e8 fs/inode.c:1860
       ext4_process_orphan+0x24c/0x2c0 fs/ext4/orphan.c:358
       ext4_orphan_cleanup+0x964/0x1090 fs/ext4/orphan.c:472
       __ext4_fill_super fs/ext4/super.c:5574 [inline]
       ext4_fill_super+0x5af8/0x63bc fs/ext4/super.c:5693
       get_tree_bdev+0x35c/0x54c fs/super.c:1366
       ext4_get_tree+0x28/0x38 fs/ext4/super.c:5723
       vfs_get_tree+0x90/0x278 fs/super.c:1573
       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+0x58/0x128 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 (&ei->xattr_sem){++++}-{3:3}:
       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
       down_read+0x64/0x300 kernel/locking/rwsem.c:1520
       ext4_xattr_get+0xec/0x554 fs/ext4/xattr.c:654
       ext4_get_acl+0x94/0x640 fs/ext4/acl.c:165
       get_acl+0x160/0x32c fs/posix_acl.c:153
       posix_acl_create+0x104/0x3d0 fs/posix_acl.c:632
       ext4_init_acl+0xb0/0x344 fs/ext4/acl.c:283
       __ext4_new_inode+0x295c/0x3520 fs/ext4/ialloc.c:1333
       ext4_ext_migrate+0x488/0xbf8 fs/ext4/migrate.c:455
       __ext4_ioctl fs/ext4/ioctl.c:1405 [inline]
       ext4_ioctl+0x1b18/0x4370 fs/ext4/ioctl.c:1623
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:870 [inline]
       __se_sys_ioctl fs/ioctl.c:856 [inline]
       __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
       __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:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&sbi->s_writepages_rwsem);
                               lock(&ei->xattr_sem);
                               lock(&sbi->s_writepages_rwsem);
  lock(&ei->xattr_sem);

 *** DEADLOCK ***

3 locks held by syz.0.24/4519:
 #0: ffff0000eb7b8460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write_file+0x64/0x1ec fs/namespace.c:446
 #1: ffff0000e53b9810 (&sb->s_type->i_mutex_key#10){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
 #1: ffff0000e53b9810 (&sb->s_type->i_mutex_key#10){++++}-{3:3}, at: __ext4_ioctl fs/ext4/ioctl.c:1404 [inline]
 #1: ffff0000e53b9810 (&sb->s_type->i_mutex_key#10){++++}-{3:3}, at: ext4_ioctl+0x1b10/0x4370 fs/ext4/ioctl.c:1623
 #2: ffff0000eb7bac18 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0x208/0xbf8 fs/ext4/migrate.c:437

stack backtrace:
CPU: 0 PID: 4519 Comm: syz.0.24 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
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
 down_read+0x64/0x300 kernel/locking/rwsem.c:1520
 ext4_xattr_get+0xec/0x554 fs/ext4/xattr.c:654
 ext4_get_acl+0x94/0x640 fs/ext4/acl.c:165
 get_acl+0x160/0x32c fs/posix_acl.c:153
 posix_acl_create+0x104/0x3d0 fs/posix_acl.c:632
 ext4_init_acl+0xb0/0x344 fs/ext4/acl.c:283
 __ext4_new_inode+0x295c/0x3520 fs/ext4/ialloc.c:1333
 ext4_ext_migrate+0x488/0xbf8 fs/ext4/migrate.c:455
 __ext4_ioctl fs/ext4/ioctl.c:1405 [inline]
 ext4_ioctl+0x1b18/0x4370 fs/ext4/ioctl.c:1623
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
 __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