======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.5.8110/24923 is trying to acquire lock:
ffff8881a8c1d4d8 (&ei->xattr_sem){++++}-{4:4}, at: ext4_destroy_inline_data+0x28/0xe0

but task is already holding lock:
ffff88816fb04c18 (&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+0x133/0x10e0
       writeback_single_inode+0x4ac/0xdc0
       write_inode_now+0x1c2/0x290
       iput+0x8c1/0xe80
       ext4_xattr_block_set+0x1fd4/0x2ad0
       ext4_expand_extra_isize_ea+0x12cf/0x1ea0
       __ext4_expand_extra_isize+0x30d/0x400
       __ext4_mark_inode_dirty+0x45c/0x710
       ext4_evict_inode+0x986/0x10e0
       evict+0x61e/0xb10
       ext4_orphan_cleanup+0xc38/0x1470
       ext4_fill_super+0x5a19/0x6330
       get_tree_bdev_flags+0x431/0x4f0
       vfs_get_tree+0x92/0x2a0
       do_new_mount+0x341/0xd30
       __se_sys_mount+0x31d/0x420
       do_syscall_64+0x15f/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ei->xattr_sem){++++}-{4:4}:
       __lock_acquire+0x15a5/0x2cf0
       lock_acquire+0x106/0x350
       down_write+0x96/0x200
       ext4_destroy_inline_data+0x28/0xe0
       ext4_do_writepages+0x51e/0x4670
       ext4_writepages+0x241/0x3b0
       do_writepages+0x32e/0x550
       filemap_flush+0x1e1/0x2e0
       ext4_convert_inline_data+0x18e/0x600
       ext4_page_mkwrite+0x247/0x1150
       do_page_mkwrite+0x14d/0x310
       do_wp_page+0x19ba/0x4cc0
       handle_mm_fault+0x151d/0x3170
       do_user_addr_fault+0x75b/0x1340
       exc_page_fault+0x6a/0xc0
       asm_exc_page_fault+0x26/0x30
       filldir+0x299/0x650
       ext4_readdir+0x186d/0x41a0
       iterate_dir+0x399/0x570
       __se_sys_getdents+0xf1/0x270
       do_syscall_64+0x15f/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 ***

6 locks held by syz.5.8110/24923:
 #0: ffff8881bd75d4f0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
 #1: ffff8881a8c1bb88 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: iterate_dir+0x292/0x570
 #2: ffff8881adfc8338 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x36/0x340
 #3: ffff88816fb06508 (sb_pagefaults){++++}-{0:0}, at: ext4_page_mkwrite+0x202/0x1150
 #4: ffff8881a8c1d928 (mapping.invalidate_lock#2){++++}-{4:4}, at: ext4_page_mkwrite+0x23a/0x1150
 #5: ffff88816fb04c18 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x205/0x3b0

stack backtrace:
CPU: 0 UID: 0 PID: 24923 Comm: syz.5.8110 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+0x106/0x350
 down_write+0x96/0x200
 ext4_destroy_inline_data+0x28/0xe0
 ext4_do_writepages+0x51e/0x4670
 ext4_writepages+0x241/0x3b0
 do_writepages+0x32e/0x550
 filemap_flush+0x1e1/0x2e0
 ext4_convert_inline_data+0x18e/0x600
 ext4_page_mkwrite+0x247/0x1150
 do_page_mkwrite+0x14d/0x310
 do_wp_page+0x19ba/0x4cc0
 handle_mm_fault+0x151d/0x3170
 do_user_addr_fault+0x75b/0x1340
 exc_page_fault+0x6a/0xc0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:filldir+0x299/0x650
Code: 48 89 df e8 79 19 e8 ff 48 8b 13 48 89 d0 48 29 e8 48 b9 00 f0 ff ff ff 7f 00 00 48 39 c8 48 0f 47 c1 0f 1f 00 48 8b 4c 24 30 <48> 89 48 08 48 bd 00 00 00 00 00 fc ff df 48 8b 44 24 28 48 89 02
RSP: 0018:ffffc90008dbfa20 EFLAGS: 00010287
RAX: 0000200000001fc0 RBX: ffffc90008dbfe38 RCX: 0000000000000000
RDX: 0000200000001fc0 RSI: 0000000000000113 RDI: 0000000000000114
RBP: 0000000000000000 R08: 0000000000000002 R09: 0000000000000004
R10: 000000000000ffff R11: ffffffff8248e360 R12: ffff88810b992008
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000004
 ext4_readdir+0x186d/0x41a0
 iterate_dir+0x399/0x570
 __se_sys_getdents+0xf1/0x270
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2a9d9cdd9
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:00007fe2aabeb028 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007fe2aa016090 RCX: 00007fe2a9d9cdd9
RDX: 00000000000000b8 RSI: 0000200000001fc0 RDI: 0000000000000004
RBP: 00007fe2a9e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe2aa016128 R14: 00007fe2aa016090 R15: 00007ffe136013e8
 </TASK>
EXT4-fs error (device loop5): ext4_mb_generate_buddy:1317: group 0, block bitmap and bg descriptor inconsistent: 25 vs 281 free clusters
EXT4-fs (loop5): Delayed block allocation failed for inode 15 at logical offset 0 with max blocks 498 with error 28
EXT4-fs (loop5): This should not happen!! Data will be lost

EXT4-fs (loop5): Total free blocks count 0
EXT4-fs (loop5): Free/Dirty block details
EXT4-fs (loop5): free_blocks=4096
EXT4-fs (loop5): dirty_blocks=512
EXT4-fs (loop5): Block reservation details
EXT4-fs (loop5): i_reserved_data_blocks=32
