============================================
WARNING: possible recursive locking detected
6.1.129-syzkaller #0 Not tainted
--------------------------------------------
syz.0.1032/9546 is trying to acquire lock:
ffff8880568c3c00 (&ni->ni_lock/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1101 [inline]
ffff8880568c3c00 (&ni->ni_lock/5){+.+.}-{3:3}, at: mi_read+0x2dd/0x5a0 fs/ntfs3/record.c:148
but task is already holding lock:
ffff888056867700 (&ni->ni_lock/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1101 [inline]
ffff888056867700 (&ni->ni_lock/5){+.+.}-{3:3}, at: ntfs_link+0xf0/0x280 fs/ntfs3/namei.c:149
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&ni->ni_lock/5);
lock(&ni->ni_lock/5);
*** DEADLOCK ***
May be due to missing lock nesting notation
6 locks held by syz.0.1032/9546:
#0: ffff8880747a2460 (sb_writers#26){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393
#1: ffff888070cf2120 (&type->i_mutex_dir_key#17/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline]
#1: ffff888070cf2120 (&type->i_mutex_dir_key#17/1){+.+.}-{3:3}, at: filename_create+0x25c/0x530 fs/namei.c:3876
#2: ffff8880568679a0 (&sb->s_type->i_mutex_key#31){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
#2: ffff8880568679a0 (&sb->s_type->i_mutex_key#31){+.+.}-{3:3}, at: vfs_link+0x53f/0x810 fs/namei.c:4590
#3: ffff888070cf1e80 (&ni->ni_lock/6){+.+.}-{3:3}, at: ni_lock_dir fs/ntfs3/ntfs_fs.h:1106 [inline]
#3: ffff888070cf1e80 (&ni->ni_lock/6){+.+.}-{3:3}, at: ntfs_link+0xd5/0x280 fs/ntfs3/namei.c:147
#4: ffff888056867700 (&ni->ni_lock/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1101 [inline]
#4: ffff888056867700 (&ni->ni_lock/5){+.+.}-{3:3}, at: ntfs_link+0xf0/0x280 fs/ntfs3/namei.c:149
#5: ffff888024898120 (&wnd->rw_lock/1){+.+.}-{3:3}, at: ntfs_look_free_mft+0x1e1/0x10c0 fs/ntfs3/fsntfs.c:542
stack backtrace:
CPU: 1 PID: 9546 Comm: syz.0.1032 Not tainted 6.1.129-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_deadlock_bug kernel/locking/lockdep.c:2983 [inline]
check_deadlock kernel/locking/lockdep.c:3026 [inline]
validate_chain+0x4711/0x5950 kernel/locking/lockdep.c:3812
__lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747
ni_lock fs/ntfs3/ntfs_fs.h:1101 [inline]
mi_read+0x2dd/0x5a0 fs/ntfs3/record.c:148
mi_format_new+0x194/0x5f0 fs/ntfs3/record.c:411
ni_add_subrecord+0xde/0x430 fs/ntfs3/frecord.c:373
ntfs_look_free_mft+0x874/0x10c0 fs/ntfs3/fsntfs.c:686
ni_create_attr_list+0x9cf/0x15c0 fs/ntfs3/frecord.c:875
ni_ins_attr_ext+0x330/0xbf0 fs/ntfs3/frecord.c:976
ni_insert_attr fs/ntfs3/frecord.c:1143 [inline]
ni_insert_resident fs/ntfs3/frecord.c:1527 [inline]
ni_add_name+0x619/0xc30 fs/ntfs3/frecord.c:3105
ntfs_link_inode+0x12c/0x170 fs/ntfs3/inode.c:1708
ntfs_link+0x112/0x280 fs/ntfs3/namei.c:154
vfs_link+0x65e/0x810 fs/namei.c:4599
do_linkat+0x352/0x750 fs/namei.c:4670
__do_sys_link fs/namei.c:4704 [inline]
__se_sys_link fs/namei.c:4702 [inline]
__x64_sys_link+0x82/0x90 fs/namei.c:4702
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f853e78d169
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:00007f853f643038 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 00007f853e9a5fa0 RCX: 00007f853e78d169
RDX: 0000000000000000 RSI: 0000400000000240 RDI: 00004000000001c0
RBP: 00007f853e80e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f853e9a5fa0 R15: 00007ffd335f4e28
</TASK>