loop3: detected capacity change from 0 to 512
EXT4-fs: Ignoring removed nobh option
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.3.3886/20725 is trying to acquire lock:
ffff8880594acc18 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x213/0x2e70 fs/ext4/inode.c:2717

but task is already holding lock:
ffff88804eccb2f0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline]
ffff88804eccb2f0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6043 [inline]
ffff88804eccb2f0 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3f6/0x760 fs/ext4/inode.c:6124

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ei->xattr_sem){++++}-{3:3}:
       down_write+0x36/0x60 kernel/locking/rwsem.c:1573
       ext4_write_lock_xattr fs/ext4/xattr.h:158 [inline]
       ext4_destroy_inline_data+0x24/0xe0 fs/ext4/inline.c:1930
       ext4_writepages+0x599/0x2e70 fs/ext4/inode.c:2763
       do_writepages+0x3c6/0x640 mm/page-writeback.c:2491
       filemap_fdatawrite_wbc+0x11e/0x180 mm/filemap.c:388
       __filemap_fdatawrite_range mm/filemap.c:421 [inline]
       __filemap_fdatawrite mm/filemap.c:427 [inline]
       filemap_flush+0xe0/0x140 mm/filemap.c:454
       ext4_release_file+0x7e/0x300 fs/ext4/file.c:158
       __fput+0x20a/0x8b0 fs/file_table.c:320
       task_work_run+0x1d0/0x260 kernel/task_work.c:203
       resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
       exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
       exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
       __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
       syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
       do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (&sbi->s_writepages_rwsem){.+.+}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3095 [inline]
       check_prevs_add kernel/locking/lockdep.c:3214 [inline]
       validate_chain kernel/locking/lockdep.c:3830 [inline]
       __lock_acquire+0x2d18/0x7c40 kernel/locking/lockdep.c:5063
       lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676
       percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51
       ext4_writepages+0x213/0x2e70 fs/ext4/inode.c:2717
       do_writepages+0x3c6/0x640 mm/page-writeback.c:2491
       __writeback_single_inode+0x153/0x1170 fs/fs-writeback.c:1673
       writeback_single_inode+0x3d2/0x8e0 fs/fs-writeback.c:1794
       write_inode_now+0x17f/0x210 fs/fs-writeback.c:2837
       iput_final fs/inode.c:1821 [inline]
       iput+0x643/0x9c0 fs/inode.c:1860
       ext4_xattr_block_set+0x2487/0x2fe0 fs/ext4/xattr.c:2148
       ext4_xattr_move_to_block fs/ext4/xattr.c:2613 [inline]
       ext4_xattr_make_inode_space fs/ext4/xattr.c:2688 [inline]
       ext4_expand_extra_isize_ea+0xfca/0x1d40 fs/ext4/xattr.c:2776
       __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:6003
       ext4_try_to_expand_extra_isize fs/ext4/inode.c:6046 [inline]
       __ext4_mark_inode_dirty+0x478/0x760 fs/ext4/inode.c:6124
       ext4_evict_inode+0xa67/0x10e0 fs/ext4/inode.c:281
       evict+0x4b6/0x8b0 fs/inode.c:705
       ext4_orphan_cleanup+0xc32/0x1470 fs/ext4/orphan.c:472
       __ext4_fill_super fs/ext4/super.c:5574 [inline]
       ext4_fill_super+0x6f0c/0x78f0 fs/ext4/super.c:5693
       get_tree_bdev+0x3e6/0x610 fs/super.c:1366
       vfs_get_tree+0x88/0x270 fs/super.c:1573
       do_new_mount+0x247/0xa40 fs/namespace.c:3078
       do_mount fs/namespace.c:3421 [inline]
       __do_sys_mount fs/namespace.c:3629 [inline]
       __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

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);
  lock(&sbi->s_writepages_rwsem);

 *** DEADLOCK ***

3 locks held by syz.3.3886/20725:
 #0: ffff88805ce620e0 (&type->s_umount_key#27/1){+.+.}-{3:3}, at: alloc_super+0x1fb/0x930 fs/super.c:228
 #1: ffff88805ce62650 (sb_internal){++++}-{0:0}, at: __sb_start_write include/linux/fs.h:1891 [inline]
 #1: ffff88805ce62650 (sb_internal){++++}-{0:0}, at: sb_start_intwrite include/linux/fs.h:2013 [inline]
 #1: ffff88805ce62650 (sb_internal){++++}-{0:0}, at: ext4_evict_inode+0x431/0x10e0 fs/ext4/inode.c:242
 #2: ffff88804eccb2f0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline]
 #2: ffff88804eccb2f0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6043 [inline]
 #2: ffff88804eccb2f0 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3f6/0x760 fs/ext4/inode.c:6124

stack backtrace:
CPU: 1 PID: 20725 Comm: syz.3.3886 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2170
 check_prev_add kernel/locking/lockdep.c:3095 [inline]
 check_prevs_add kernel/locking/lockdep.c:3214 [inline]
 validate_chain kernel/locking/lockdep.c:3830 [inline]
 __lock_acquire+0x2d18/0x7c40 kernel/locking/lockdep.c:5063
 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676
 percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51
 ext4_writepages+0x213/0x2e70 fs/ext4/inode.c:2717
 do_writepages+0x3c6/0x640 mm/page-writeback.c:2491
 __writeback_single_inode+0x153/0x1170 fs/fs-writeback.c:1673
 writeback_single_inode+0x3d2/0x8e0 fs/fs-writeback.c:1794
 write_inode_now+0x17f/0x210 fs/fs-writeback.c:2837
 iput_final fs/inode.c:1821 [inline]
 iput+0x643/0x9c0 fs/inode.c:1860
 ext4_xattr_block_set+0x2487/0x2fe0 fs/ext4/xattr.c:2148
 ext4_xattr_move_to_block fs/ext4/xattr.c:2613 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2688 [inline]
 ext4_expand_extra_isize_ea+0xfca/0x1d40 fs/ext4/xattr.c:2776
 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:6003
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6046 [inline]
 __ext4_mark_inode_dirty+0x478/0x760 fs/ext4/inode.c:6124
 ext4_evict_inode+0xa67/0x10e0 fs/ext4/inode.c:281
 evict+0x4b6/0x8b0 fs/inode.c:705
 ext4_orphan_cleanup+0xc32/0x1470 fs/ext4/orphan.c:472
 __ext4_fill_super fs/ext4/super.c:5574 [inline]
 ext4_fill_super+0x6f0c/0x78f0 fs/ext4/super.c:5693
 get_tree_bdev+0x3e6/0x610 fs/super.c:1366
 vfs_get_tree+0x88/0x270 fs/super.c:1573
 do_new_mount+0x247/0xa40 fs/namespace.c:3078
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f471bf9f28a
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:00007f471cd8ce58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f471cd8cee0 RCX: 00007f471bf9f28a
RDX: 0000200000000180 RSI: 0000200000000140 RDI: 00007f471cd8cea0
RBP: 0000200000000180 R08: 00007f471cd8cee0 R09: 0000000000800718
R10: 0000000000800718 R11: 0000000000000246 R12: 0000200000000140
R13: 00007f471cd8cea0 R14: 00000000000004a3 R15: 00002000000003c0
 </TASK>
------------[ cut here ]------------
EA inode 11 i_nlink=1026
WARNING: CPU: 1 PID: 20725 at fs/ext4/xattr.c:1006 ext4_xattr_inode_update_ref+0x4fe/0x560 fs/ext4/xattr.c:1004
Modules linked in:
CPU: 1 PID: 20725 Comm: syz.3.3886 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:ext4_xattr_inode_update_ref+0x4fe/0x560 fs/ext4/xattr.c:1004
Code: 40 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 65 e2 9b ff 49 8b 34 24 48 c7 c7 00 a0 a0 8a 44 89 fa e8 e2 3f 16 ff <0f> 0b 49 bd 00 00 00 00 00 fc ff df 4c 8b 74 24 08 4c 8b 64 24 10
RSP: 0018:ffffc900036bf260 EFLAGS: 00010246
RAX: 49d3ed76fbb9ed00 RBX: ffff888071d0acc8 RCX: 0000000000080000
RDX: ffffc9000dce9000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900036bf350 R08: ffffc900036beee7 R09: 1ffff920006d7ddc
R10: dffffc0000000000 R11: fffff520006d7ddd R12: ffff888071d0ab10
R13: dffffc0000000000 R14: ffff888071d0aad0 R15: 0000000000000402
FS:  00007f471cd8d6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000088030 CR3: 00000000643dc000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_xattr_inode_dec_ref fs/ext4/xattr.c:1029 [inline]
 ext4_xattr_set_entry+0xb2b/0x1eb0 fs/ext4/xattr.c:1673
 ext4_xattr_ibody_set+0x25e/0x700 fs/ext4/xattr.c:2217
 ext4_xattr_move_to_block fs/ext4/xattr.c:2620 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2688 [inline]
 ext4_expand_extra_isize_ea+0x125e/0x1d40 fs/ext4/xattr.c:2776
 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:6003
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6046 [inline]
 __ext4_mark_inode_dirty+0x478/0x760 fs/ext4/inode.c:6124
 ext4_evict_inode+0xa67/0x10e0 fs/ext4/inode.c:281
 evict+0x4b6/0x8b0 fs/inode.c:705
 ext4_orphan_cleanup+0xc32/0x1470 fs/ext4/orphan.c:472
 __ext4_fill_super fs/ext4/super.c:5574 [inline]
 ext4_fill_super+0x6f0c/0x78f0 fs/ext4/super.c:5693
 get_tree_bdev+0x3e6/0x610 fs/super.c:1366
 vfs_get_tree+0x88/0x270 fs/super.c:1573
 do_new_mount+0x247/0xa40 fs/namespace.c:3078
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f471bf9f28a
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:00007f471cd8ce58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f471cd8cee0 RCX: 00007f471bf9f28a
RDX: 0000200000000180 RSI: 0000200000000140 RDI: 00007f471cd8cea0
RBP: 0000200000000180 R08: 00007f471cd8cee0 R09: 0000000000800718
R10: 0000000000800718 R11: 0000000000000246 R12: 0000200000000140
R13: 00007f471cd8cea0 R14: 00000000000004a3 R15: 00002000000003c0
 </TASK>