======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.2.750/9491 is trying to acquire lock:
ffff8881190b6108 (&ei->xattr_sem){++++}-{4:4}, at: ext4_destroy_inline_data+0x28/0xe0

but task is already holding lock:
ffff8881b8a56b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x205/0x3b0

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_internal+0x48/0x1c0
       ext4_writepages+0x205/0x3b0
       do_writepages+0x32e/0x550
       __writeback_single_inode+0x133/0x1230
       writeback_single_inode+0x493/0xc70
       write_inode_now+0x1c2/0x290
       iput+0xa73/0x1020
       ext4_xattr_block_set+0x1fd4/0x2ad0
       ext4_expand_extra_isize_ea+0x12cf/0x1ea0
       __ext4_expand_extra_isize+0x30d/0x400
       __ext4_mark_inode_dirty+0x45c/0x6e0
       ext4_evict_inode+0x7a1/0xe60
       evict+0x61e/0xb10
       ext4_orphan_cleanup+0xc38/0x1470
       ext4_fill_super+0x5932/0x61f0
       get_tree_bdev_flags+0x431/0x4f0
       vfs_get_tree+0x92/0x2a0
       do_new_mount+0x329/0xa50
       __se_sys_mount+0x31d/0x420
       do_syscall_64+0xe2/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ei->xattr_sem){++++}-{4:4}:
       __lock_acquire+0x15a5/0x2cf0
       lock_acquire+0x106/0x330
       down_write+0x96/0x200
       ext4_destroy_inline_data+0x28/0xe0
       ext4_do_writepages+0x51e/0x4600
       ext4_writepages+0x241/0x3b0
       do_writepages+0x32e/0x550
       filemap_flush+0x1e1/0x2e0
       ext4_rename2+0x105f/0x3110
       vfs_rename+0xa96/0xeb0
       do_renameat2+0x548/0x900
       __x64_sys_rename+0x82/0x90
       do_syscall_64+0xe2/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

5 locks held by syz.2.750/9491:
 #0: ffff8881b8a54420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881b8263400 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: __start_renaming+0x148/0x410
 #2: ffff8881190b1720 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: lock_two_nondirectories+0xe7/0x180
 #3: ffff8881190b6420 (&sb->s_type->i_mutex_key#11/4){+.+.}-{4:4}, at: vfs_rename+0x68a/0xeb0
 #4: ffff8881b8a56b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x205/0x3b0

stack backtrace:
CPU: 1 UID: 0 PID: 9491 Comm: syz.2.750 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_circular_bug+0x2e1/0x300
 check_noncircular+0x12e/0x150
 __lock_acquire+0x15a5/0x2cf0
 lock_acquire+0x106/0x330
 down_write+0x96/0x200
 ext4_destroy_inline_data+0x28/0xe0
 ext4_do_writepages+0x51e/0x4600
 ext4_writepages+0x241/0x3b0
 do_writepages+0x32e/0x550
 filemap_flush+0x1e1/0x2e0
 ext4_rename2+0x105f/0x3110
 vfs_rename+0xa96/0xeb0
 do_renameat2+0x548/0x900
 __x64_sys_rename+0x82/0x90
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7c0219acb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7c02f74028 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f7c02416090 RCX: 00007f7c0219acb9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000200000000000
RBP: 00007f7c02208bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7c02416128 R14: 00007f7c02416090 R15: 00007ffdad1c78f8
 </TASK>
EXT4-fs error (device loop2): ext4_validate_block_bitmap:441: comm syz.2.750: bg 0: block 234: padding at end of block bitmap is not set
EXT4-fs (loop2): Remounting filesystem read-only
