============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.6.488/6525 is trying to acquire lock:
ffff88806438aa58 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_truncate+0x97f/0x10f0 fs/ext4/inode.c:4251

but task is already holding lock:
ffff88806438dc30 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_setattr+0x133d/0x19e0 fs/ext4/inode.c:5564

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.6.488/6525:
 #0: ffff88807999a460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:386
 #1: ffff88806438dda8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
 #1: ffff88806438dda8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: do_truncate+0x198/0x240 fs/open.c:63
 #2: ffff88806438df48 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #2: ffff88806438df48 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_setattr+0xdb6/0x19e0 fs/ext4/inode.c:5524
 #3: ffff88806438dc30 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_setattr+0x133d/0x19e0 fs/ext4/inode.c:5564
 #4: ffff88806438da80 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline]
 #4: ffff88806438da80 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5945 [inline]
 #4: ffff88806438da80 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3e8/0x700 fs/ext4/inode.c:6026

stack backtrace:
CPU: 1 PID: 6525 Comm: syz.6.488 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 __lock_acquire+0x1236/0x7d10 kernel/locking/lockdep.c:-1
 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
 down_write+0x38/0x60 kernel/locking/rwsem.c:1551
 ext4_truncate+0x97f/0x10f0 fs/ext4/inode.c:4251
 ext4_evict_inode+0xb4f/0x1090 fs/ext4/inode.c:289
 evict+0x4c9/0x8d0 fs/inode.c:647
 ext4_xattr_set_entry+0x34ec/0x3ea0 fs/ext4/xattr.c:1823
 ext4_xattr_ibody_set+0x112/0x330 fs/ext4/xattr.c:2237
 ext4_xattr_move_to_block fs/ext4/xattr.c:2624 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2692 [inline]
 ext4_expand_extra_isize_ea+0x10d3/0x19b0 fs/ext4/xattr.c:2780
 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:5905
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5948 [inline]
 __ext4_mark_inode_dirty+0x469/0x700 fs/ext4/inode.c:6026
 ext4_setattr+0x13b7/0x19e0 fs/ext4/inode.c:5567
 notify_change+0xbcd/0xee0 fs/attr.c:505
 do_truncate+0x1ac/0x240 fs/open.c:65
 vfs_truncate+0x262/0x2f0 fs/open.c:111
 do_sys_truncate+0xf2/0x1c0 fs/open.c:134
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fa5ad8c0cb9
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:00007fa5abb1c028 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007fa5adb3bfa0 RCX: 00007fa5ad8c0cb9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000200000000300
RBP: 00007fa5ad92ebf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa5adb3c038 R14: 00007fa5adb3bfa0 R15: 00007ffc71706f58
 </TASK>