============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.5.494/7256 is trying to acquire lock:
ffff88805603d238 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_truncate+0x96d/0x10d0 fs/ext4/inode.c:4245
but task is already holding lock:
ffff88805603be48 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_setattr+0x133d/0x19e0 fs/ext4/inode.c:5546
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.5.494/7256:
#0: ffff88806225a460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:377
#1: ffff88805603bfc0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff88805603bfc0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: do_truncate+0x183/0x220 fs/open.c:63
#2: ffff88805603c160 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
#2: ffff88805603c160 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_setattr+0xdb6/0x19e0 fs/ext4/inode.c:5506
#3: ffff88805603be48 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_setattr+0x133d/0x19e0 fs/ext4/inode.c:5546
#4: ffff88805603bc98 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline]
#4: ffff88805603bc98 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5927 [inline]
#4: ffff88805603bc98 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3e8/0x700 fs/ext4/inode.c:6008
stack backtrace:
CPU: 1 PID: 7256 Comm: syz.5.494 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
<TASK>
dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
__lock_acquire+0x1227/0x7c60 kernel/locking/lockdep.c:-1
lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
down_write+0x38/0x60 kernel/locking/rwsem.c:1551
ext4_truncate+0x96d/0x10d0 fs/ext4/inode.c:4245
ext4_evict_inode+0xb43/0x1080 fs/ext4/inode.c:289
evict+0x485/0x870 fs/inode.c:647
ext4_xattr_set_entry+0x10f7/0x3d30 fs/ext4/xattr.c:1835
ext4_xattr_ibody_set+0x112/0x330 fs/ext4/xattr.c:2252
ext4_xattr_move_to_block fs/ext4/xattr.c:2639 [inline]
ext4_xattr_make_inode_space fs/ext4/xattr.c:2707 [inline]
ext4_expand_extra_isize_ea+0xf9a/0x19a0 fs/ext4/xattr.c:2799
__ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:5887
ext4_try_to_expand_extra_isize fs/ext4/inode.c:5930 [inline]
__ext4_mark_inode_dirty+0x469/0x700 fs/ext4/inode.c:6008
ext4_setattr+0x13b7/0x19e0 fs/ext4/inode.c:5549
notify_change+0xbcd/0xee0 fs/attr.c:505
do_truncate+0x197/0x220 fs/open.c:65
vfs_truncate+0x262/0x2f0 fs/open.c:111
do_sys_truncate+0xdc/0x190 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: 0033:0x7f87c542dba9
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:00007f87c3695038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007f87c5674fa0 RCX: 00007f87c542dba9
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00002000000000c0
RBP: 00007f87c54b0e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f87c5675038 R14: 00007f87c5674fa0 R15: 00007ffc362a3fe8
</TASK>