loop4: detected capacity change from 0 to 512
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.4.483/8306 is trying to acquire lock:
ffff8881166d2b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1ca/0x350

but task is already holding lock:
ffff8880225b8a68 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x3db/0x6e0

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ei->xattr_sem){++++}-{4:4}:
       down_write+0x96/0x1f0
       ext4_destroy_inline_data+0x28/0xe0
       ext4_do_writepages+0x4e6/0x4500
       ext4_writepages+0x203/0x350
       do_writepages+0x32e/0x550
       filemap_flush+0x191/0x230
       ext4_release_file+0x82/0x310
       __fput+0x44c/0xa70
       task_work_run+0x1d4/0x260
       exit_to_user_mode_loop+0xff/0x4f0
       do_syscall_64+0x2d0/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&sbi->s_writepages_rwsem){++++}-{0:0}:
       __lock_acquire+0x15a6/0x2cf0
       lock_acquire+0x117/0x340
       percpu_down_read_internal+0x48/0x1c0
       ext4_writepages+0x1ca/0x350
       do_writepages+0x32e/0x550
       __writeback_single_inode+0x133/0x1240
       writeback_single_inode+0x493/0xc70
       write_inode_now+0x160/0x1d0
       iput+0xa77/0x1030
       ext4_xattr_block_set+0x1fce/0x2ac0
       ext4_expand_extra_isize_ea+0x12da/0x1ea0
       __ext4_expand_extra_isize+0x30d/0x400
       __ext4_mark_inode_dirty+0x45c/0x6e0
       ext4_evict_inode+0x79c/0xe60
       evict+0x5f4/0xae0
       ext4_orphan_cleanup+0xc20/0x1460
       ext4_fill_super+0x58a1/0x6160
       get_tree_bdev_flags+0x40e/0x4d0
       vfs_get_tree+0x92/0x2a0
       do_new_mount+0x302/0xa10
       __se_sys_mount+0x313/0x410
       do_syscall_64+0xfa/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

3 locks held by syz.4.483/8306:
 #0: ffff8881166d00e0 (&type->s_umount_key#27/1){+.+.}-{4:4}, at: alloc_super+0x28c/0xaa0
 #1: ffff8881166d0610 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x26f/0xe60
 #2: ffff8880225b8a68 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x3db/0x6e0

stack backtrace:
CPU: 0 UID: 0 PID: 8306 Comm: syz.4.483 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+0x189/0x250
 print_circular_bug+0x2e2/0x300
 check_noncircular+0x12e/0x150
 __lock_acquire+0x15a6/0x2cf0
 lock_acquire+0x117/0x340
 percpu_down_read_internal+0x48/0x1c0
 ext4_writepages+0x1ca/0x350
 do_writepages+0x32e/0x550
 __writeback_single_inode+0x133/0x1240
 writeback_single_inode+0x493/0xc70
 write_inode_now+0x160/0x1d0
 iput+0xa77/0x1030
 ext4_xattr_block_set+0x1fce/0x2ac0
 ext4_expand_extra_isize_ea+0x12da/0x1ea0
 __ext4_expand_extra_isize+0x30d/0x400
 __ext4_mark_inode_dirty+0x45c/0x6e0
 ext4_evict_inode+0x79c/0xe60
 evict+0x5f4/0xae0
 ext4_orphan_cleanup+0xc20/0x1460
 ext4_fill_super+0x58a1/0x6160
 get_tree_bdev_flags+0x40e/0x4d0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x302/0xa10
 __se_sys_mount+0x313/0x410
 do_syscall_64+0xfa/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa8ecf90f6a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa8edd4ae68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fa8edd4aef0 RCX: 00007fa8ecf90f6a
RDX: 0000200000000180 RSI: 0000200000000080 RDI: 00007fa8edd4aeb0
RBP: 0000200000000180 R08: 00007fa8edd4aef0 R09: 0000000000800700
R10: 0000000000800700 R11: 0000000000000246 R12: 0000200000000080
R13: 00007fa8edd4aeb0 R14: 000000000000046f R15: 00002000000000c0
 </TASK>
EXT4-fs error (device loop4): ext4_xattr_inode_iget:441: inode #11: comm syz.4.483: iget: bad extra_isize 90 (inode size 256)
EXT4-fs error (device loop4): ext4_xattr_inode_iget:446: comm syz.4.483: error while reading EA inode 11 err=-117
EXT4-fs error (device loop4): ext4_xattr_inode_iget:441: inode #11: comm syz.4.483: iget: bad extra_isize 90 (inode size 256)
EXT4-fs error (device loop4): ext4_xattr_inode_iget:446: comm syz.4.483: error while reading EA inode 11 err=-117
EXT4-fs error (device loop4): ext4_xattr_inode_iget:441: inode #18: comm syz.4.483: iget: bad extra_isize 90 (inode size 256)
EXT4-fs error (device loop4): ext4_xattr_inode_iget:446: comm syz.4.483: error while reading EA inode 18 err=-117
EXT4-fs error (device loop4): ext4_xattr_inode_iget:441: inode #18: comm syz.4.483: iget: bad extra_isize 90 (inode size 256)
EXT4-fs error (device loop4): ext4_xattr_inode_iget:446: comm syz.4.483: error while reading EA inode 18 err=-117
EXT4-fs (loop4): 1 orphan inode deleted
EXT4-fs (loop4): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
