loop2: detected capacity change from 0 to 512
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.2.296/6758 is trying to acquire lock:
ffff88807e95cbd8 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline]
ffff88807e95cbd8 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x170/0x2f0 fs/ext4/inode.c:2806

but task is already holding lock:
ffff88805d40d0c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline]
ffff88805d40d0c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6007 [inline]
ffff88805d40d0c8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3dc/0x6e0 fs/ext4/inode.c:6088

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ei->xattr_sem){++++}-{3:3}:
       down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573
       ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
       ext4_destroy_inline_data+0x28/0xe0 fs/ext4/inline.c:1884
       ext4_do_writepages+0x4c2/0x38d0 fs/ext4/inode.c:2604
       ext4_writepages+0x1a8/0x2f0 fs/ext4/inode.c:2807
       do_writepages+0x3a2/0x600 mm/page-writeback.c:2575
       filemap_fdatawrite_wbc+0x122/0x180 mm/filemap.c:390
       __filemap_fdatawrite_range mm/filemap.c:423 [inline]
       file_write_and_wait_range+0x171/0x240 mm/filemap.c:781
       generic_buffers_fsync_noflush+0x6f/0x160 fs/buffer.c:609
       ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
       ext4_sync_file+0x454/0xc10 fs/ext4/fsync.c:151
       generic_write_sync include/linux/fs.h:2651 [inline]
       ext4_buffered_write_iter+0x2c0/0x350 fs/ext4/file.c:305
       ext4_file_write_iter+0x1d9/0x1870 fs/ext4/file.c:-1
       call_write_iter include/linux/fs.h:2018 [inline]
       new_sync_write fs/read_write.c:491 [inline]
       vfs_write+0x43b/0x940 fs/read_write.c:584
       ksys_pwrite64 fs/read_write.c:699 [inline]
       __do_sys_pwrite64 fs/read_write.c:709 [inline]
       __se_sys_pwrite64 fs/read_write.c:706 [inline]
       __x64_sys_pwrite64+0x195/0x220 fs/read_write.c:706
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (&sbi->s_writepages_rwsem){++++}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137
       lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
       percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51
       ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline]
       ext4_writepages+0x170/0x2f0 fs/ext4/inode.c:2806
       do_writepages+0x3a2/0x600 mm/page-writeback.c:2575
       __writeback_single_inode+0x153/0xee0 fs/fs-writeback.c:1635
       writeback_single_inode+0x211/0x720 fs/fs-writeback.c:1756
       write_inode_now+0x161/0x1e0 fs/fs-writeback.c:2802
       iput_final fs/inode.c:1807 [inline]
       iput+0x5b2/0x920 fs/inode.c:1846
       ext4_xattr_block_set+0x273a/0x32a0 fs/ext4/xattr.c:2211
       ext4_xattr_move_to_block fs/ext4/xattr.c:2679 [inline]
       ext4_xattr_make_inode_space fs/ext4/xattr.c:2754 [inline]
       ext4_expand_extra_isize_ea+0x10ea/0x19e0 fs/ext4/xattr.c:2846
       __ext4_expand_extra_isize+0x306/0x400 fs/ext4/inode.c:5967
       ext4_try_to_expand_extra_isize fs/ext4/inode.c:6010 [inline]
       __ext4_mark_inode_dirty+0x45d/0x6e0 fs/ext4/inode.c:6088
       ext4_evict_inode+0x7ed/0xea0 fs/ext4/inode.c:252
       evict+0x486/0x870 fs/inode.c:705
       ext4_orphan_cleanup+0xbd4/0x1400 fs/ext4/orphan.c:470
       __ext4_fill_super fs/ext4/super.c:5601 [inline]
       ext4_fill_super+0x5de4/0x66c0 fs/ext4/super.c:5724
       get_tree_bdev+0x3e4/0x510 fs/super.c:1591
       vfs_get_tree+0x8c/0x280 fs/super.c:1764
       do_new_mount+0x24b/0xa40 fs/namespace.c:3386
       do_mount fs/namespace.c:3726 [inline]
       __do_sys_mount fs/namespace.c:3935 [inline]
       __se_sys_mount+0x2da/0x3c0 fs/namespace.c:3912
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
       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);
  rlock(&sbi->s_writepages_rwsem);

 *** DEADLOCK ***

3 locks held by syz.2.296/6758:
 #0: ffff8880768c80e0 (&type->s_umount_key#32){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff8880768c80e0 (&type->s_umount_key#32){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff8880768c80e0 (&type->s_umount_key#32){++++}-{3:3}, at: get_tree_bdev+0x344/0x510 fs/super.c:1589
 #1: ffff8880768c8608 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1633 [inline]
 #1: ffff8880768c8608 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1755 [inline]
 #1: ffff8880768c8608 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x2b9/0xea0 fs/ext4/inode.c:213
 #2: ffff88805d40d0c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline]
 #2: ffff88805d40d0c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6007 [inline]
 #2: ffff88805d40d0c8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3dc/0x6e0 fs/ext4/inode.c:6088

stack backtrace:
CPU: 1 PID: 6758 Comm: syz.2.296 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137
 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
 percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51
 ext4_writepages_down_read fs/ext4/ext4.h:1767 [inline]
 ext4_writepages+0x170/0x2f0 fs/ext4/inode.c:2806
 do_writepages+0x3a2/0x600 mm/page-writeback.c:2575
 __writeback_single_inode+0x153/0xee0 fs/fs-writeback.c:1635
 writeback_single_inode+0x211/0x720 fs/fs-writeback.c:1756
 write_inode_now+0x161/0x1e0 fs/fs-writeback.c:2802
 iput_final fs/inode.c:1807 [inline]
 iput+0x5b2/0x920 fs/inode.c:1846
 ext4_xattr_block_set+0x273a/0x32a0 fs/ext4/xattr.c:2211
 ext4_xattr_move_to_block fs/ext4/xattr.c:2679 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2754 [inline]
 ext4_expand_extra_isize_ea+0x10ea/0x19e0 fs/ext4/xattr.c:2846
 __ext4_expand_extra_isize+0x306/0x400 fs/ext4/inode.c:5967
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6010 [inline]
 __ext4_mark_inode_dirty+0x45d/0x6e0 fs/ext4/inode.c:6088
 ext4_evict_inode+0x7ed/0xea0 fs/ext4/inode.c:252
 evict+0x486/0x870 fs/inode.c:705
 ext4_orphan_cleanup+0xbd4/0x1400 fs/ext4/orphan.c:470
 __ext4_fill_super fs/ext4/super.c:5601 [inline]
 ext4_fill_super+0x5de4/0x66c0 fs/ext4/super.c:5724
 get_tree_bdev+0x3e4/0x510 fs/super.c:1591
 vfs_get_tree+0x8c/0x280 fs/super.c:1764
 do_new_mount+0x24b/0xa40 fs/namespace.c:3386
 do_mount fs/namespace.c:3726 [inline]
 __do_sys_mount fs/namespace.c:3935 [inline]
 __se_sys_mount+0x2da/0x3c0 fs/namespace.c:3912
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5d3c390eea
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:00007f5d3a5f5e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5d3a5f5ef0 RCX: 00007f5d3c390eea
RDX: 0000200000000180 RSI: 00002000000001c0 RDI: 00007f5d3a5f5eb0
RBP: 0000200000000180 R08: 00007f5d3a5f5ef0 R09: 0000000000800718
R10: 0000000000800718 R11: 0000000000000246 R12: 00002000000001c0
R13: 00007f5d3a5f5eb0 R14: 000000000000046f R15: 0000200000000200
 </TASK>
------------[ cut here ]------------
EA inode 11 i_nlink=2
WARNING: CPU: 0 PID: 6758 at fs/ext4/xattr.c:1075 ext4_xattr_inode_update_ref+0x4fb/0x550 fs/ext4/xattr.c:1073
Modules linked in:
CPU: 0 PID: 6758 Comm: syz.2.296 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:ext4_xattr_inode_update_ref+0x4fb/0x550 fs/ext4/xattr.c:1073
Code: 8d 7e 50 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8 c6 3b 9a ff 49 8b 37 48 c7 c7 a0 c3 be 8a 89 da e8 c5 5d 0d ff <0f> 0b 4c 8b 74 24 08 4c 8b 7c 24 10 e9 b9 fe ff ff e8 6f 1d 2c 08
RSP: 0018:ffffc900032d71c0 EFLAGS: 00010246
RAX: 9ec659dcfd242c00 RBX: 0000000000000002 RCX: 0000000000080000
RDX: ffffc9000dabd000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900032d72b8 R08: ffffc900032d6dc7 R09: 1ffff9200065adb8
R10: dffffc0000000000 R11: fffff5200065adb9 R12: dffffc0000000000
R13: ffff88805d40f2a8 R14: ffff88805d40f0b0 R15: ffff88805d40f100
FS:  00007f5d3a5f66c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd0427b42f8 CR3: 0000000053522000 CR4: 00000000003506f0
DR0: 0000000000000008 DR1: 0000000000000001 DR2: 0000000000000004
DR3: 0000000000000008 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_xattr_inode_dec_ref fs/ext4/xattr.c:1098 [inline]
 ext4_xattr_set_entry+0xcda/0x1e90 fs/ext4/xattr.c:1736
 ext4_xattr_ibody_set+0x254/0x6a0 fs/ext4/xattr.c:2283
 ext4_xattr_move_to_block fs/ext4/xattr.c:2686 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2754 [inline]
 ext4_expand_extra_isize_ea+0x113a/0x19e0 fs/ext4/xattr.c:2846
 __ext4_expand_extra_isize+0x306/0x400 fs/ext4/inode.c:5967
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6010 [inline]
 __ext4_mark_inode_dirty+0x45d/0x6e0 fs/ext4/inode.c:6088
 ext4_evict_inode+0x7ed/0xea0 fs/ext4/inode.c:252
 evict+0x486/0x870 fs/inode.c:705
 ext4_orphan_cleanup+0xbd4/0x1400 fs/ext4/orphan.c:470
 __ext4_fill_super fs/ext4/super.c:5601 [inline]
 ext4_fill_super+0x5de4/0x66c0 fs/ext4/super.c:5724
 get_tree_bdev+0x3e4/0x510 fs/super.c:1591
 vfs_get_tree+0x8c/0x280 fs/super.c:1764
 do_new_mount+0x24b/0xa40 fs/namespace.c:3386
 do_mount fs/namespace.c:3726 [inline]
 __do_sys_mount fs/namespace.c:3935 [inline]
 __se_sys_mount+0x2da/0x3c0 fs/namespace.c:3912
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5d3c390eea
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:00007f5d3a5f5e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5d3a5f5ef0 RCX: 00007f5d3c390eea
RDX: 0000200000000180 RSI: 00002000000001c0 RDI: 00007f5d3a5f5eb0
RBP: 0000200000000180 R08: 00007f5d3a5f5ef0 R09: 0000000000800718
R10: 0000000000800718 R11: 0000000000000246 R12: 00002000000001c0
R13: 00007f5d3a5f5eb0 R14: 000000000000046f R15: 0000200000000200
 </TASK>