loop3: detected capacity change from 0 to 4096
============================================
WARNING: possible recursive locking detected
6.12.0-rc3-syzkaller-00013-geca631b8fe80 #0 Not tainted
--------------------------------------------
syz.3.509/9876 is trying to acquire lock:
ffff8880784b4318 (&ni->ni_lock/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1109 [inline]
ffff8880784b4318 (&ni->ni_lock/5){+.+.}-{3:3}, at: mi_read+0x2e1/0x5a0 fs/ntfs3/record.c:148
but task is already holding lock:
ffff88805c68ad10 (&ni->ni_lock/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1109 [inline]
ffff88805c68ad10 (&ni->ni_lock/5){+.+.}-{3:3}, at: ntfs_link+0xf4/0x270 fs/ntfs3/namei.c:141
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.3.509/9876:
#0: ffff88802e330420 (sb_writers#27){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515
#1: ffff88805c68f918 (&type->i_mutex_dir_key#20/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:850 [inline]
#1: ffff88805c68f918 (&type->i_mutex_dir_key#20/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:4026
#2: ffff88805c68afa8 (&sb->s_type->i_mutex_key#36){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline]
#2: ffff88805c68afa8 (&sb->s_type->i_mutex_key#36){+.+.}-{3:3}, at: vfs_link+0x3b2/0x6e0 fs/namei.c:4730
#3: ffff88805c68f680 (&ni->ni_lock/6){+.+.}-{3:3}, at: ni_lock_dir fs/ntfs3/ntfs_fs.h:1114 [inline]
#3: ffff88805c68f680 (&ni->ni_lock/6){+.+.}-{3:3}, at: ntfs_link+0xd9/0x270 fs/ntfs3/namei.c:139
#4: ffff88805c68ad10 (&ni->ni_lock/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1109 [inline]
#4: ffff88805c68ad10 (&ni->ni_lock/5){+.+.}-{3:3}, at: ntfs_link+0xf4/0x270 fs/ntfs3/namei.c:141
#5: ffff888063624128 (&wnd->rw_lock/1){+.+.}-{3:3}, at: ntfs_look_free_mft+0x1e5/0x10c0 fs/ntfs3/fsntfs.c:571
stack backtrace:
CPU: 0 UID: 0 PID: 9876 Comm: syz.3.509 Not tainted 6.12.0-rc3-syzkaller-00013-geca631b8fe80 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3037
check_deadlock kernel/locking/lockdep.c:3089 [inline]
validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3891
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
ni_lock fs/ntfs3/ntfs_fs.h:1109 [inline]
mi_read+0x2e1/0x5a0 fs/ntfs3/record.c:148
mi_format_new+0x1ab/0x5d0 fs/ntfs3/record.c:419
ni_add_subrecord+0xe2/0x430 fs/ntfs3/frecord.c:374
ntfs_look_free_mft+0x878/0x10c0 fs/ntfs3/fsntfs.c:715
ni_create_attr_list+0x9bd/0x1480 fs/ntfs3/frecord.c:878
ni_ins_attr_ext+0x369/0xbe0 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+0x809/0xe90 fs/ntfs3/frecord.c:3112
ntfs_link_inode+0x130/0x170 fs/ntfs3/inode.c:1735
ntfs_link+0x116/0x270 fs/ntfs3/namei.c:146
vfs_link+0x4f0/0x6e0 fs/namei.c:4739
do_linkat+0x555/0x6f0 fs/namei.c:4809
__do_sys_link fs/namei.c:4843 [inline]
__se_sys_link fs/namei.c:4841 [inline]
__x64_sys_link+0x82/0x90 fs/namei.c:4841
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5e2497dff9
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:00007f5e25842038 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 00007f5e24b35f80 RCX: 00007f5e2497dff9
RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000020000040
RBP: 00007f5e249f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5e24b35f80 R15: 00007ffec87b8ab8
</TASK>