EXT4-fs: Ignoring removed mblk_io_submit option
EXT4-fs: Ignoring removed nobh option
EXT4-fs: Ignoring removed nobh option
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.5.2059/11014 is trying to acquire lock:
ffff8881bc656c18 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x205/0x3b0

but task is already holding lock:
ffff8881a448db60 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x3d0/0x700

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ei->xattr_sem){++++}-{4:4}:
       down_write+0x96/0x200
       ext4_destroy_inline_data+0x28/0xe0
       ext4_do_writepages+0x50a/0x4480
       ext4_writepages+0x241/0x3b0
       do_writepages+0x338/0x560
       __writeback_single_inode+0x136/0x1220
       writeback_sb_inodes+0x9de/0x1b00
       wb_writeback+0x41c/0xad0
       wb_workfn+0x431/0x10f0
       process_scheduled_works+0xa88/0x14c0
       worker_thread+0xa47/0xfb0
       kthread+0x38b/0x480
       ret_from_fork+0x514/0xb70
       ret_from_fork_asm+0x1a/0x30

-> #0 (&sbi->s_writepages_rwsem){++++}-{0:0}:
       __lock_acquire+0x1520/0x2cf0
       lock_acquire+0x106/0x350
       percpu_down_read_internal+0x48/0x1d0
       ext4_writepages+0x205/0x3b0
       do_writepages+0x338/0x560
       __writeback_single_inode+0x136/0x1220
       writeback_single_inode+0x544/0xf70
       write_inode_now+0x1c2/0x290
       iput+0x98b/0xf00
       ext4_xattr_block_set+0x1b0c/0x2a80
       ext4_expand_extra_isize_ea+0x1342/0x1e70
       __ext4_expand_extra_isize+0x30d/0x400
       __ext4_mark_inode_dirty+0x455/0x700
       ext4_evict_inode+0x920/0x1080
       evict+0x624/0xb50
       ext4_orphan_cleanup+0xc7a/0x14c0
       ext4_fill_super+0x5cb9/0x65d0
       get_tree_bdev_flags+0x430/0x4f0
       vfs_get_tree+0x92/0x2a0
       do_new_mount+0x319/0xdc0
       __se_sys_mount+0x31d/0x420
       do_syscall_64+0x166/0x520
       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 ***

locks held by syz.5.2059/11014: 3, last CPU#1:
 #0: ffff88819e1520e8 (&type->s_umount_key#29/1){+.+.}-{4:4}, at: sget_fc+0x97c/0x1a40
 #1: ffff88819e152650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x3cc/0x1080
 #2: ffff8881a448db60 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x3d0/0x700

stack backtrace:
CPU: 1 UID: 0 PID: 11014 Comm: syz.5.2059 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+0x1520/0x2cf0
 lock_acquire+0x106/0x350
 percpu_down_read_internal+0x48/0x1d0
 ext4_writepages+0x205/0x3b0
 do_writepages+0x338/0x560
 __writeback_single_inode+0x136/0x1220
 writeback_single_inode+0x544/0xf70
 write_inode_now+0x1c2/0x290
 iput+0x98b/0xf00
 ext4_xattr_block_set+0x1b0c/0x2a80
 ext4_expand_extra_isize_ea+0x1342/0x1e70
 __ext4_expand_extra_isize+0x30d/0x400
 __ext4_mark_inode_dirty+0x455/0x700
 ext4_evict_inode+0x920/0x1080
 evict+0x624/0xb50
 ext4_orphan_cleanup+0xc7a/0x14c0
 ext4_fill_super+0x5cb9/0x65d0
 get_tree_bdev_flags+0x430/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x319/0xdc0
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f32f7b9f3ca
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f32f89e1e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f32f89e1ee0 RCX: 00007f32f7b9f3ca
RDX: 0000200000000180 RSI: 0000200000000080 RDI: 00007f32f89e1ea0
RBP: 0000200000000180 R08: 00007f32f89e1ee0 R09: 0000000000800718
R10: 0000000000800718 R11: 0000000000000246 R12: 0000200000000080
R13: 00007f32f89e1ea0 R14: 00000000000004a7 R15: 0000200000000240
 </TASK>
------------[ cut here ]------------
EA inode 11 i_nlink=1026
WARNING: fs/ext4/xattr.c:1059 at ext4_xattr_inode_update_ref+0x4cc/0x590, CPU#1: syz.5.2059/11014
Modules linked in:
CPU: 1 UID: 0 PID: 11014 Comm: syz.5.2059 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
RIP: 0010:ext4_xattr_inode_update_ref+0x50c/0x590
Code: 08 4c 89 e7 e8 a5 6b 94 ff 4d 8b 24 24 48 b8 00 00 00 00 00 fc ff df 41 0f b6 04 07 84 c0 75 73 41 8b 55 00 48 89 df 4c 89 e6 <67> 48 0f b9 3a e9 5f fe ff ff e8 c5 31 35 09 44 89 e9 80 e1 07 80
RSP: 0018:ffffc9000434f140 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff905ec9c0 RCX: dffffc0000000000
RDX: 0000000000000402 RSI: 000000000000000b RDI: ffffffff905ec9c0
RBP: ffffc9000434f238 R08: ffff8881a448ba8f R09: 1ffff11034891751
R10: dffffc0000000000 R11: ffffed1034891752 R12: 000000000000000b
R13: ffff8881a448b8e8 R14: 0000000000000000 R15: 1ffff1103489171d
FS:  00007f32f89e26c0(0000) GS:ffff8882a8f39000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555d8259d8 CR3: 000000019b290000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 ext4_xattr_set_entry+0xb19/0x1ed0
 ext4_xattr_ibody_set+0x262/0x710
 ext4_expand_extra_isize_ea+0x138c/0x1e70
 __ext4_expand_extra_isize+0x30d/0x400
 __ext4_mark_inode_dirty+0x455/0x700
 ext4_evict_inode+0x920/0x1080
 evict+0x624/0xb50
 ext4_orphan_cleanup+0xc7a/0x14c0
 ext4_fill_super+0x5cb9/0x65d0
 get_tree_bdev_flags+0x430/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x319/0xdc0
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f32f7b9f3ca
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f32f89e1e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f32f89e1ee0 RCX: 00007f32f7b9f3ca
RDX: 0000200000000180 RSI: 0000200000000080 RDI: 00007f32f89e1ea0
RBP: 0000200000000180 R08: 00007f32f89e1ee0 R09: 0000000000800718
R10: 0000000000800718 R11: 0000000000000246 R12: 0000200000000080
R13: 00007f32f89e1ea0 R14: 00000000000004a7 R15: 0000200000000240
 </TASK>
