EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
============================================
WARNING: possible recursive locking detected
6.6.101-syzkaller #0 Not tainted
--------------------------------------------
syz.0.1105/12369 is trying to acquire lock:
ffff88805e4ec888 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_truncate+0x91d/0x1060 fs/ext4/inode.c:4260

but task is already holding lock:
ffff88807427e688 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_setattr+0x15fa/0x1c90 fs/ext4/inode.c:5581

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&ei->i_data_sem/3);
  lock(&ei->i_data_sem/3);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

5 locks held by syz.0.1105/12369:
 #0: ffff888024374418 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:403
 #1: ffff88807427e810 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
 #1: ffff88807427e810 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: do_truncate+0x187/0x220 fs/open.c:64
 #2: ffff88807427e9a0 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:849 [inline]
 #2: ffff88807427e9a0 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_setattr+0xef3/0x1c90 fs/ext4/inode.c:5529
 #3: ffff88807427e688 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_setattr+0x15fa/0x1c90 fs/ext4/inode.c:5581
 #4: ffff88807427e4c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline]
 #4: ffff88807427e4c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5993 [inline]
 #4: ffff88807427e4c8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3dc/0x6e0 fs/ext4/inode.c:6074

stack backtrace:
CPU: 0 PID: 12369 Comm: syz.0.1105 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 check_deadlock kernel/locking/lockdep.c:3062 [inline]
 validate_chain kernel/locking/lockdep.c:3856 [inline]
 __lock_acquire+0x5d40/0x7c80 kernel/locking/lockdep.c:5137
 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
 down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573
 ext4_truncate+0x91d/0x1060 fs/ext4/inode.c:4260
 ext4_evict_inode+0x8af/0xea0 fs/ext4/inode.c:259
 evict+0x486/0x870 fs/inode.c:705
 ext4_xattr_set_entry+0x132e/0x1e90 fs/ext4/xattr.c:1856
 ext4_xattr_ibody_set+0x254/0x6a0 fs/ext4/xattr.c:2278
 ext4_xattr_move_to_block fs/ext4/xattr.c:2681 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2749 [inline]
 ext4_expand_extra_isize_ea+0x113a/0x19e0 fs/ext4/xattr.c:2841
 __ext4_expand_extra_isize+0x306/0x400 fs/ext4/inode.c:5953
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5996 [inline]
 __ext4_mark_inode_dirty+0x45d/0x6e0 fs/ext4/inode.c:6074
 ext4_setattr+0x1673/0x1c90 fs/ext4/inode.c:5584
 notify_change+0xb0d/0xe10 fs/attr.c:499
 do_truncate+0x19b/0x220 fs/open.c:66
 vfs_truncate+0x266/0x300 fs/open.c:112
 do_sys_truncate+0xe0/0x1a0 fs/open.c:135
 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: 0033:0x7f2ec1b8e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2ec2a02038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007f2ec1db5fa0 RCX: 00007f2ec1b8e9a9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000200000000100
RBP: 00007f2ec1c10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f2ec1db5fa0 R15: 00007ffe947248c8
 </TASK>