======================================================
WARNING: possible circular locking dependency detected
6.3.0-rc7-syzkaller-00060-g789b4a41c247 #0 Not tainted
------------------------------------------------------
syz-executor.4/18650 is trying to acquire lock:
ffff888046069708 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x267/0x18d0 fs/ext4/inode.c:574

but task is already holding lock:
ffff88804c1cc208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x8f/0x250 fs/quota/quota_v2.c:354

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&s->s_dquot.dqio_sem){++++}-{3:3}:
       down_read+0x3d/0x50 kernel/locking/rwsem.c:1520
       v2_read_dquot+0x4d/0x120 fs/quota/quota_v2.c:332
       dquot_acquire+0x1b3/0x6c0 fs/quota/dquot.c:435
       ext4_acquire_dquot+0x2b1/0x3d0 fs/ext4/super.c:6770
       dqget+0x67d/0x1080 fs/quota/dquot.c:914
       __dquot_initialize+0x560/0xbe0 fs/quota/dquot.c:1492
       ext4_process_orphan+0x47/0x410 fs/ext4/orphan.c:329
       ext4_orphan_cleanup+0x6e5/0x1110 fs/ext4/orphan.c:474
       __ext4_fill_super fs/ext4/super.c:5509 [inline]
       ext4_fill_super+0x94b6/0xb300 fs/ext4/super.c:5637
       get_tree_bdev+0x444/0x760 fs/super.c:1303
       vfs_get_tree+0x8d/0x350 fs/super.c:1510
       do_new_mount fs/namespace.c:3042 [inline]
       path_mount+0x1342/0x1e40 fs/namespace.c:3372
       do_mount fs/namespace.c:3385 [inline]
       __do_sys_mount fs/namespace.c:3594 [inline]
       __se_sys_mount fs/namespace.c:3571 [inline]
       __x64_sys_mount+0x283/0x300 fs/namespace.c:3571
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #1 (&dquot->dq_lock){+.+.}-{3:3}:
       __mutex_lock_common kernel/locking/mutex.c:603 [inline]
       __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747
       dquot_commit+0x51/0x570 fs/quota/dquot.c:479
       ext4_write_dquot+0x25f/0x330 fs/ext4/super.c:6754
       ext4_mark_dquot_dirty fs/ext4/super.c:6802 [inline]
       ext4_mark_dquot_dirty+0x115/0x1b0 fs/ext4/super.c:6796
       mark_dquot_dirty fs/quota/dquot.c:346 [inline]
       mark_all_dquot_dirty fs/quota/dquot.c:384 [inline]
       __dquot_alloc_space+0x5f9/0xb80 fs/quota/dquot.c:1722
       dquot_alloc_space_nodirty include/linux/quotaops.h:300 [inline]
       dquot_alloc_space include/linux/quotaops.h:313 [inline]
       dquot_alloc_block include/linux/quotaops.h:337 [inline]
       ext4_mb_new_blocks+0x5d5/0x4b20 fs/ext4/mballoc.c:5571
       ext4_ext_map_blocks+0x1fdb/0x5be0 fs/ext4/extents.c:4286
       ext4_map_blocks+0x779/0x18d0 fs/ext4/inode.c:651
       _ext4_get_block+0x241/0x580 fs/ext4/inode.c:807
       ext4_block_write_begin+0x570/0x1780 fs/ext4/inode.c:1097
       ext4_write_begin+0x53c/0x1000 fs/ext4/inode.c:1229
       ext4_da_write_begin+0x222/0xa10 fs/ext4/inode.c:3057
       generic_perform_write+0x256/0x570 mm/filemap.c:3926
       ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:289
       ext4_file_write_iter+0xbe0/0x1740 fs/ext4/file.c:710
       call_write_iter include/linux/fs.h:1851 [inline]
       new_sync_write fs/read_write.c:491 [inline]
       vfs_write+0x9ed/0xe10 fs/read_write.c:584
       ksys_write+0x12b/0x250 fs/read_write.c:637
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 (&ei->i_data_sem/2){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3098 [inline]
       check_prevs_add kernel/locking/lockdep.c:3217 [inline]
       validate_chain kernel/locking/lockdep.c:3832 [inline]
       __lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056
       lock_acquire kernel/locking/lockdep.c:5669 [inline]
       lock_acquire+0x1af/0x520 kernel/locking/lockdep.c:5634
       down_read+0x3d/0x50 kernel/locking/rwsem.c:1520
       ext4_map_blocks+0x267/0x18d0 fs/ext4/inode.c:574
       ext4_getblk+0x61f/0x850 fs/ext4/inode.c:863
       ext4_bread+0x2e/0x190 fs/ext4/inode.c:919
       ext4_quota_write+0x218/0x620 fs/ext4/super.c:7135
       write_blk+0x12e/0x220 fs/quota/quota_tree.c:64
       get_free_dqblk+0x104/0x2f0 fs/quota/quota_tree.c:130
       do_insert_tree+0x3c5/0x12d0 fs/quota/quota_tree.c:340
       do_insert_tree+0x113e/0x12d0 fs/quota/quota_tree.c:375
       do_insert_tree+0x488/0x12d0 fs/quota/quota_tree.c:375
       do_insert_tree+0x488/0x12d0 fs/quota/quota_tree.c:375
       dq_insert_tree fs/quota/quota_tree.c:401 [inline]
       qtree_write_dquot+0x3b4/0x570 fs/quota/quota_tree.c:420
       v2_write_dquot+0x120/0x250 fs/quota/quota_v2.c:358
       dquot_acquire+0x3d1/0x6c0 fs/quota/dquot.c:444
       ext4_acquire_dquot+0x2b1/0x3d0 fs/ext4/super.c:6770
       dqget+0x67d/0x1080 fs/quota/dquot.c:914
       dquot_transfer+0x3af/0x6f0 fs/quota/dquot.c:2103
       ext4_setattr+0x10bb/0x2870 fs/ext4/inode.c:5496
       notify_change+0xb2c/0x1180 fs/attr.c:482
       chown_common+0x57f/0x650 fs/open.c:774
       do_fchownat+0x12a/0x1e0 fs/open.c:805
       __do_sys_lchown fs/open.c:830 [inline]
       __se_sys_lchown fs/open.c:828 [inline]
       __x64_sys_lchown+0x7e/0xc0 fs/open.c:828
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

other info that might help us debug this:

Chain exists of:
  &ei->i_data_sem/2 --> &dquot->dq_lock --> &s->s_dquot.dqio_sem

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&s->s_dquot.dqio_sem);
                               lock(&dquot->dq_lock);
                               lock(&s->s_dquot.dqio_sem);
  lock(&ei->i_data_sem/2);

 *** DEADLOCK ***

5 locks held by syz-executor.4/18650:
 #0: ffff88804c1cc460 (sb_writers#5){.+.+}-{0:0}, at: do_fchownat+0x105/0x1e0 fs/open.c:802
 #1: ffff88804fbb1480 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
 #1: ffff88804fbb1480 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: chown_common+0x31d/0x650 fs/open.c:764
 #2: ffff88804fbb1148 (&ei->xattr_sem){++++}-{3:3}, at: ext4_setattr+0x10ac/0x2870 fs/ext4/inode.c:5495
 #3: ffff888043b3fb28 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x51/0x6c0 fs/quota/dquot.c:432
 #4: ffff88804c1cc208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x8f/0x250 fs/quota/quota_v2.c:354

stack backtrace:
CPU: 1 PID: 18650 Comm: syz-executor.4 Not tainted 6.3.0-rc7-syzkaller-00060-g789b4a41c247 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2178
 check_prev_add kernel/locking/lockdep.c:3098 [inline]
 check_prevs_add kernel/locking/lockdep.c:3217 [inline]
 validate_chain kernel/locking/lockdep.c:3832 [inline]
 __lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056
 lock_acquire kernel/locking/lockdep.c:5669 [inline]
 lock_acquire+0x1af/0x520 kernel/locking/lockdep.c:5634
 down_read+0x3d/0x50 kernel/locking/rwsem.c:1520
 ext4_map_blocks+0x267/0x18d0 fs/ext4/inode.c:574
 ext4_getblk+0x61f/0x850 fs/ext4/inode.c:863
 ext4_bread+0x2e/0x190 fs/ext4/inode.c:919
 ext4_quota_write+0x218/0x620 fs/ext4/super.c:7135
 write_blk+0x12e/0x220 fs/quota/quota_tree.c:64
 get_free_dqblk+0x104/0x2f0 fs/quota/quota_tree.c:130
 do_insert_tree+0x3c5/0x12d0 fs/quota/quota_tree.c:340
 do_insert_tree+0x113e/0x12d0 fs/quota/quota_tree.c:375
 do_insert_tree+0x488/0x12d0 fs/quota/quota_tree.c:375
 do_insert_tree+0x488/0x12d0 fs/quota/quota_tree.c:375
 dq_insert_tree fs/quota/quota_tree.c:401 [inline]
 qtree_write_dquot+0x3b4/0x570 fs/quota/quota_tree.c:420
 v2_write_dquot+0x120/0x250 fs/quota/quota_v2.c:358
 dquot_acquire+0x3d1/0x6c0 fs/quota/dquot.c:444
 ext4_acquire_dquot+0x2b1/0x3d0 fs/ext4/super.c:6770
 dqget+0x67d/0x1080 fs/quota/dquot.c:914
 dquot_transfer+0x3af/0x6f0 fs/quota/dquot.c:2103
 ext4_setattr+0x10bb/0x2870 fs/ext4/inode.c:5496
 notify_change+0xb2c/0x1180 fs/attr.c:482
 chown_common+0x57f/0x650 fs/open.c:774
 do_fchownat+0x12a/0x1e0 fs/open.c:805
 __do_sys_lchown fs/open.c:830 [inline]
 __se_sys_lchown fs/open.c:828 [inline]
 __x64_sys_lchown+0x7e/0xc0 fs/open.c:828
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f877528c169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f876ba3e168 EFLAGS: 00000246 ORIG_RAX: 000000000000005e
RAX: ffffffffffffffda RBX: 00007f87753ac120 RCX: 00007f877528c169
RDX: ffffffffffffffff RSI: 000000000000ee01 RDI: 0000000020000280
RBP: 00007f87752e7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe630185cf R14: 00007f876ba3e300 R15: 0000000000022000
 </TASK>