netlink: 284 bytes leftover after parsing attributes in process `syz-executor.1'.
======================================================
WARNING: possible circular locking dependency detected
4.19.211-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.4/13151 is trying to acquire lock:
00000000b23a338e (&dquot->dq_lock){+.+.}, at: dquot_commit+0x4d/0x400 fs/quota/dquot.c:469

but task is already holding lock:
000000002c9b5006 (&ei->i_data_sem/2){++++}, at: ext4_map_blocks+0x740/0x1a50 fs/ext4/inode.c:650

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&ei->i_data_sem/2){++++}:
       ext4_map_blocks+0x33e/0x1a50 fs/ext4/inode.c:578
       ext4_getblk+0xad/0x4f0 fs/ext4/inode.c:993
       ext4_bread+0x7c/0x210 fs/ext4/inode.c:1043
       ext4_quota_write+0x205/0x530 fs/ext4/super.c:6008
       write_blk+0x10a/0x200 fs/quota/quota_tree.c:72
       get_free_dqblk+0xff/0x2d0 fs/quota/quota_tree.c:101
       do_insert_tree+0x79c/0x1150 fs/quota/quota_tree.c:308
       do_insert_tree+0xf5c/0x1150 fs/quota/quota_tree.c:339
       dq_insert_tree fs/quota/quota_tree.c:365 [inline]
       qtree_write_dquot+0x1cb/0x570 fs/quota/quota_tree.c:384
       v2_write_dquot+0x11c/0x250 fs/quota/quota_v2.c:359
       dquot_acquire+0x25c/0x490 fs/quota/dquot.c:436
       ext4_acquire_dquot+0x1e7/0x2d0 fs/ext4/super.c:5666
       dqget+0x785/0xfc0 fs/quota/dquot.c:896
       __dquot_initialize+0x3bd/0xb70 fs/quota/dquot.c:1470
       ext4_xattr_set+0xbd/0x2a0 fs/ext4/xattr.c:2499
       __vfs_setxattr+0x10e/0x170 fs/xattr.c:149
       __vfs_setxattr_noperm+0x11a/0x420 fs/xattr.c:180
       __vfs_setxattr_locked+0x176/0x250 fs/xattr.c:238
       vfs_setxattr+0xe5/0x270 fs/xattr.c:255
       setxattr+0x23d/0x330 fs/xattr.c:520
       path_setxattr+0x170/0x190 fs/xattr.c:539
       __do_sys_setxattr fs/xattr.c:554 [inline]
       __se_sys_setxattr fs/xattr.c:550 [inline]
       __x64_sys_setxattr+0xc0/0x160 fs/xattr.c:550
       do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #1 (&s->s_dquot.dqio_sem){++++}:
       v2_read_dquot+0x49/0x120 fs/quota/quota_v2.c:333
       dquot_acquire+0x121/0x490 fs/quota/dquot.c:428
       ext4_acquire_dquot+0x1e7/0x2d0 fs/ext4/super.c:5666
       dqget+0x785/0xfc0 fs/quota/dquot.c:896
       __dquot_initialize+0x3bd/0xb70 fs/quota/dquot.c:1470
       ext4_mkdir+0xd7/0xe10 fs/ext4/namei.c:2689
       vfs_mkdir+0x508/0x7a0 fs/namei.c:3819
       do_mkdirat+0x262/0x2d0 fs/namei.c:3842
       do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #0 (&dquot->dq_lock){+.+.}:
       __mutex_lock_common kernel/locking/mutex.c:937 [inline]
       __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078
       dquot_commit+0x4d/0x400 fs/quota/dquot.c:469
       ext4_write_dquot+0x1e7/0x280 fs/ext4/super.c:5650
       ext4_mark_dquot_dirty+0x111/0x1a0 fs/ext4/super.c:5701
       mark_dquot_dirty fs/quota/dquot.c:341 [inline]
       mark_all_dquot_dirty fs/quota/dquot.c:379 [inline]
       __dquot_alloc_space+0x37e/0x860 fs/quota/dquot.c:1702
       dquot_alloc_space_nodirty include/linux/quotaops.h:298 [inline]
       dquot_alloc_space include/linux/quotaops.h:311 [inline]
       dquot_alloc_block include/linux/quotaops.h:335 [inline]
       ext4_mb_new_blocks+0x58c/0x4370 fs/ext4/mballoc.c:4534
       ext4_alloc_branch fs/ext4/indirect.c:335 [inline]
       ext4_ind_map_blocks+0x1590/0x2430 fs/ext4/indirect.c:619
       ext4_map_blocks+0xda9/0x1a50 fs/ext4/inode.c:659
       _ext4_get_block+0x208/0x530 fs/ext4/inode.c:810
       ext4_get_block_trans+0x165/0x290 fs/ext4/inode.c:871
       ext4_dio_get_block+0x73/0xc0 fs/ext4/inode.c:888
       get_more_blocks fs/direct-io.c:717 [inline]
       do_direct_IO fs/direct-io.c:1003 [inline]
       do_blockdev_direct_IO fs/direct-io.c:1333 [inline]
       __blockdev_direct_IO+0x424b/0xef40 fs/direct-io.c:1419
       ext4_direct_IO_write fs/ext4/inode.c:3777 [inline]
       ext4_direct_IO+0xae4/0x1c50 fs/ext4/inode.c:3915
       generic_file_direct_write+0x208/0x4a0 mm/filemap.c:3073
       __generic_file_write_iter+0x2d0/0x610 mm/filemap.c:3252
       ext4_file_write_iter+0x2fe/0xf20 fs/ext4/file.c:272
       call_write_iter include/linux/fs.h:1821 [inline]
       new_sync_write fs/read_write.c:474 [inline]
       __vfs_write+0x51b/0x770 fs/read_write.c:487
       vfs_write+0x1f3/0x540 fs/read_write.c:549
       ksys_write+0x12b/0x2a0 fs/read_write.c:599
       do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

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

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

5 locks held by syz-executor.4/13151:
 #0: 0000000016ac7b3b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767
 #1: 000000008d3a0fe9 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline]
 #1: 000000008d3a0fe9 (sb_writers#3){.+.+}, at: vfs_write+0x463/0x540 fs/read_write.c:548
 #2: 000000004a722c93 (&sb->s_type->i_mutex_key#10){+.+.}, at: inode_trylock include/linux/fs.h:768 [inline]
 #2: 000000004a722c93 (&sb->s_type->i_mutex_key#10){+.+.}, at: ext4_file_write_iter+0x21f/0xf20 fs/ext4/file.c:238
 #3: 000000002c9b5006 (&ei->i_data_sem/2){++++}, at: ext4_map_blocks+0x740/0x1a50 fs/ext4/inode.c:650
 #4: 0000000012abb34b (dquot_srcu){....}, at: i_dquot fs/quota/dquot.c:921 [inline]
 #4: 0000000012abb34b (dquot_srcu){....}, at: __dquot_alloc_space+0x1ad/0x860 fs/quota/dquot.c:1662

stack backtrace:
CPU: 0 PID: 13151 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222
 check_prev_add kernel/locking/lockdep.c:1866 [inline]
 check_prevs_add kernel/locking/lockdep.c:1979 [inline]
 validate_chain kernel/locking/lockdep.c:2420 [inline]
 __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416
 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
 __mutex_lock_common kernel/locking/mutex.c:937 [inline]
 __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078
 dquot_commit+0x4d/0x400 fs/quota/dquot.c:469
 ext4_write_dquot+0x1e7/0x280 fs/ext4/super.c:5650
 ext4_mark_dquot_dirty+0x111/0x1a0 fs/ext4/super.c:5701
 mark_dquot_dirty fs/quota/dquot.c:341 [inline]
 mark_all_dquot_dirty fs/quota/dquot.c:379 [inline]
 __dquot_alloc_space+0x37e/0x860 fs/quota/dquot.c:1702
 dquot_alloc_space_nodirty include/linux/quotaops.h:298 [inline]
 dquot_alloc_space include/linux/quotaops.h:311 [inline]
 dquot_alloc_block include/linux/quotaops.h:335 [inline]
 ext4_mb_new_blocks+0x58c/0x4370 fs/ext4/mballoc.c:4534
 ext4_alloc_branch fs/ext4/indirect.c:335 [inline]
 ext4_ind_map_blocks+0x1590/0x2430 fs/ext4/indirect.c:619
 ext4_map_blocks+0xda9/0x1a50 fs/ext4/inode.c:659
 _ext4_get_block+0x208/0x530 fs/ext4/inode.c:810
 ext4_get_block_trans+0x165/0x290 fs/ext4/inode.c:871
 ext4_dio_get_block+0x73/0xc0 fs/ext4/inode.c:888
 get_more_blocks fs/direct-io.c:717 [inline]
 do_direct_IO fs/direct-io.c:1003 [inline]
 do_blockdev_direct_IO fs/direct-io.c:1333 [inline]
 __blockdev_direct_IO+0x424b/0xef40 fs/direct-io.c:1419
 ext4_direct_IO_write fs/ext4/inode.c:3777 [inline]
 ext4_direct_IO+0xae4/0x1c50 fs/ext4/inode.c:3915
 generic_file_direct_write+0x208/0x4a0 mm/filemap.c:3073
 __generic_file_write_iter+0x2d0/0x610 mm/filemap.c:3252
 ext4_file_write_iter+0x2fe/0xf20 fs/ext4/file.c:272
 call_write_iter include/linux/fs.h:1821 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x51b/0x770 fs/read_write.c:487
 vfs_write+0x1f3/0x540 fs/read_write.c:549
 ksys_write+0x12b/0x2a0 fs/read_write.c:599
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f4a9178a0f9
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:00007f4a8fcfc168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f4a918a9f80 RCX: 00007f4a9178a0f9
RDX: 000000000020b000 RSI: 0000000020000000 RDI: 0000000000000009
RBP: 00007f4a917e5ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc3bfa861f R14: 00007f4a8fcfc300 R15: 0000000000022000
EXT4-fs (loop0): Unrecognized mount option "" or missing value
netlink: 284 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 284 bytes leftover after parsing attributes in process `syz-executor.1'.
EXT4-fs warning (device loop2): ext4_multi_mount_protect:386: Unable to create kmmpd thread for loop2.
netlink: 284 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 284 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 284 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 284 bytes leftover after parsing attributes in process `syz-executor.1'.
EXT4-fs warning (device loop2): ext4_multi_mount_protect:386: Unable to create kmmpd thread for loop2.
EXT4-fs (loop0): Unrecognized mount option "blkio.bfq.io_serviced" or missing value
EXT4-fs (loop1): Unrecognized mount option "/dev/full" or missing value
EXT4-fs (loop1): Unrecognized mount option "�" or missing value
EXT4-fs (loop3): Unrecognized mount option "�" or missing value
EXT4-fs (loop3): Unrecognized mount option "�" or missing value
EXT4-fs (loop3): Unrecognized mount option "�" or missing value
EXT4-fs (loop3): Unrecognized mount option "" or missing value
EXT4-fs (loop3): Unrecognized mount option "" or missing value
EXT4-fs (loop0): Unrecognized mount option "" or missing value
EXT4-fs (loop3): Unrecognized mount option "�" or missing value
EXT4-fs warning (device loop5): ext4_multi_mount_protect:386: Unable to create kmmpd thread for loop5.
EXT4-fs (loop3): Unrecognized mount option "�" or missing value
EXT4-fs (loop3): Unrecognized mount option "�" or missing value
EXT4-fs (loop0): Unrecognized mount option "" or missing value
EXT4-fs (loop5): Unrecognized mount option "./file0" or missing value
EXT4-fs (loop3): Unrecognized mount option "����" or missing value
EXT4-fs (loop0): Unrecognized mount option "" or missing value
EXT4-fs (loop1): couldn't mount as ext3 due to feature incompatibilities