ntfs3(loop6): Failed to load $Extend (-22).
ntfs3(loop6): Failed to initialize $Extend.
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.6.1351/18503 is trying to acquire lock:
ffff888040cff030 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:601
but task is already holding lock:
ffff88805e201f50 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline]
ffff88805e201f50 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_readdir+0x752/0xec0 fs/ntfs3/dir.c:499
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&ni->ni_lock/5){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/rtmutex_api.c:559 [inline]
mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:578
ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline]
attr_data_get_block+0x1bf/0x2a0 fs/ntfs3/attrib.c:976
ntfs_file_mmap_prepare+0x5b3/0xa20 fs/ntfs3/file.c:430
vfs_mmap_prepare include/linux/fs.h:2071 [inline]
call_mmap_prepare mm/vma.c:2672 [inline]
__mmap_region mm/vma.c:2758 [inline]
mmap_region+0xe78/0x2310 mm/vma.c:2860
do_mmap+0xc1e/0x10b0 mm/mmap.c:560
vm_mmap_pgoff+0x275/0x4e0 mm/util.c:581
ksys_mmap_pgoff+0x4a6/0x720 mm/mmap.c:606
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&mm->mmap_lock){++++}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x1520/0x2ce0 kernel/locking/lockdep.c:5237
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
down_read_killable+0xa4/0x220 kernel/locking/rwsem.c:1599
mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:601
get_mmap_lock_carefully mm/mmap_lock.c:450 [inline]
lock_mm_and_find_vma+0x2d6/0x340 mm/mmap_lock.c:501
do_user_addr_fault+0x341/0x1340 arch/x86/mm/fault.c:1366
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
filldir+0x2bd/0x630 fs/readdir.c:-1
dir_emit include/linux/fs.h:3582 [inline]
ntfs_dir_emit fs/ntfs3/dir.c:346 [inline]
ntfs_read_hdr+0x8a4/0xc10 fs/ntfs3/dir.c:387
ntfs_readdir+0x9ea/0xec0 fs/ntfs3/dir.c:547
iterate_dir+0x2f1/0x4e0 fs/readdir.c:110
__do_sys_getdents fs/readdir.c:319 [inline]
__se_sys_getdents+0xf1/0x270 fs/readdir.c:304
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ni->ni_lock/5);
lock(&mm->mmap_lock);
lock(&ni->ni_lock/5);
rlock(&mm->mmap_lock);
*** DEADLOCK ***
3 locks held by syz.6.1351/18503:
#0: ffff888029783d28 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x252/0x320 fs/file.c:1259
#1: ffff88805e202208 (&type->i_mutex_dir_key#20){++++}-{4:4}, at: iterate_dir+0x215/0x4e0 fs/readdir.c:103
#2: ffff88805e201f50 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline]
#2: ffff88805e201f50 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_readdir+0x752/0xec0 fs/ntfs3/dir.c:499
stack backtrace:
CPU: 0 UID: 0 PID: 18503 Comm: syz.6.1351 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043
check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x1520/0x2ce0 kernel/locking/lockdep.c:5237
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
down_read_killable+0xa4/0x220 kernel/locking/rwsem.c:1599
mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:601
get_mmap_lock_carefully mm/mmap_lock.c:450 [inline]
lock_mm_and_find_vma+0x2d6/0x340 mm/mmap_lock.c:501
do_user_addr_fault+0x341/0x1340 arch/x86/mm/fault.c:1366
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0010:filldir+0x2bd/0x630 fs/readdir.c:290
Code: 89 a6 82 ff 0f 01 cb 48 8b 44 24 20 49 89 47 08 48 bd 00 00 00 00 00 fc ff df 48 8b 44 24 40 48 89 03 8b 4c 24 04 48 8d 43 10 <66> 89 08 8b 54 24 14 80 e2 0f 89 c9 48 8d 04 0b 48 ff c8 88 10 48
RSP: 0018:ffffc900045c7ab0 EFLAGS: 00050297
RAX: 0000200000002000 RBX: 0000200000001ff0 RCX: 0000000000000020
RDX: 0000000000000002 RSI: 0000000000000008 RDI: 0000000000000007
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100405d001 R12: ffff888033c68000
R13: 0000000000000008 R14: 0000000000000008 R15: 0000200000001fd8
dir_emit include/linux/fs.h:3582 [inline]
ntfs_dir_emit fs/ntfs3/dir.c:346 [inline]
ntfs_read_hdr+0x8a4/0xc10 fs/ntfs3/dir.c:387
ntfs_readdir+0x9ea/0xec0 fs/ntfs3/dir.c:547
iterate_dir+0x2f1/0x4e0 fs/readdir.c:110
__do_sys_getdents fs/readdir.c:319 [inline]
__se_sys_getdents+0xf1/0x270 fs/readdir.c:304
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5d3420de59
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:00007f5d32466028 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007f5d34495fa0 RCX: 00007f5d3420de59
RDX: 00000000000000b8 RSI: 0000200000001fc0 RDI: 0000000000000004
RBP: 00007f5d342a3e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5d34496038 R14: 00007f5d34495fa0 R15: 00007fff688ecd18
</TASK>
----------------
Code disassembly (best guess):
0: 89 a6 82 ff 0f 01 mov %esp,0x10fff82(%rsi)
6: cb lret
7: 48 8b 44 24 20 mov 0x20(%rsp),%rax
c: 49 89 47 08 mov %rax,0x8(%r15)
10: 48 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%rbp
17: fc ff df
1a: 48 8b 44 24 40 mov 0x40(%rsp),%rax
1f: 48 89 03 mov %rax,(%rbx)
22: 8b 4c 24 04 mov 0x4(%rsp),%ecx
26: 48 8d 43 10 lea 0x10(%rbx),%rax
* 2a: 66 89 08 mov %cx,(%rax) <-- trapping instruction
2d: 8b 54 24 14 mov 0x14(%rsp),%edx
31: 80 e2 0f and $0xf,%dl
34: 89 c9 mov %ecx,%ecx
36: 48 8d 04 0b lea (%rbx,%rcx,1),%rax
3a: 48 ff c8 dec %rax
3d: 88 10 mov %dl,(%rax)
3f: 48 rex.W