loop4: detected capacity change from 0 to 4096
ntfs3(loop4): Different NTFS sector size (4096) and media sector size (512).
ntfs3(loop4): ino=19, mi_enum_attr
ntfs3(loop4): Mark volume as dirty due to NTFS errors
======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc7-syzkaller-00202-g183601b78a9b #0 Not tainted
------------------------------------------------------
syz.4.802/14146 is trying to acquire lock:
ffff88807f8859a0 (&mm->mmap_lock){++++}-{4:4}, at: __might_fault+0xaa/0x120 mm/memory.c:6839
but task is already holding lock:
ffff88805116ef28 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1111 [inline]
ffff88805116ef28 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_fiemap+0xff/0x180 fs/ntfs3/file.c:1358
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&ni->ni_lock/5){+.+.}-{4:4}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730
ni_lock fs/ntfs3/ntfs_fs.h:1111 [inline]
attr_data_get_block+0x464/0x2fb0 fs/ntfs3/attrib.c:918
ntfs_file_mmap+0x4f2/0x850 fs/ntfs3/file.c:371
call_mmap include/linux/fs.h:2245 [inline]
mmap_file mm/internal.h:124 [inline]
__mmap_new_file_vma mm/vma.c:2296 [inline]
__mmap_new_vma mm/vma.c:2360 [inline]
__mmap_region mm/vma.c:2462 [inline]
mmap_region+0x246d/0x2fc0 mm/vma.c:2540
do_mmap+0xecc/0x13a0 mm/mmap.c:561
vm_mmap_pgoff+0x2a0/0x530 mm/util.c:578
ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:607
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
-> #0 (&mm->mmap_lock){++++}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__might_fault+0xc6/0x120 mm/memory.c:6839
_inline_copy_to_user include/linux/uaccess.h:192 [inline]
_copy_to_user+0x2c/0xb0 lib/usercopy.c:26
copy_to_user include/linux/uaccess.h:225 [inline]
fiemap_fill_next_extent+0x235/0x420 fs/ioctl.c:145
ni_fiemap+0x970/0x1270 fs/ntfs3/frecord.c:2042
ntfs_fiemap+0x132/0x180 fs/ntfs3/file.c:1360
ioctl_fiemap fs/ioctl.c:220 [inline]
do_vfs_ioctl+0x1981/0x2770 fs/ioctl.c:840
__do_sys_ioctl fs/ioctl.c:904 [inline]
__se_sys_ioctl+0x80/0x170 fs/ioctl.c:892
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
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 ***
1 lock held by syz.4.802/14146:
#0: ffff88805116ef28 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1111 [inline]
#0: ffff88805116ef28 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_fiemap+0xff/0x180 fs/ntfs3/file.c:1358
stack backtrace:
CPU: 0 UID: 0 PID: 14146 Comm: syz.4.802 Not tainted 6.14.0-rc7-syzkaller-00202-g183601b78a9b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__might_fault+0xc6/0x120 mm/memory.c:6839
_inline_copy_to_user include/linux/uaccess.h:192 [inline]
_copy_to_user+0x2c/0xb0 lib/usercopy.c:26
copy_to_user include/linux/uaccess.h:225 [inline]
fiemap_fill_next_extent+0x235/0x420 fs/ioctl.c:145
ni_fiemap+0x970/0x1270 fs/ntfs3/frecord.c:2042
ntfs_fiemap+0x132/0x180 fs/ntfs3/file.c:1360
ioctl_fiemap fs/ioctl.c:220 [inline]
do_vfs_ioctl+0x1981/0x2770 fs/ioctl.c:840
__do_sys_ioctl fs/ioctl.c:904 [inline]
__se_sys_ioctl+0x80/0x170 fs/ioctl.c:892
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: 0033:0x7ff09b98d169
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:00007ff09c8af038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff09bba5fa0 RCX: 00007ff09b98d169
RDX: 00002000000000c0 RSI: 00000000c020660b RDI: 0000000000000004
RBP: 00007ff09ba0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff09bba5fa0 R15: 00007ffef978a248
</TASK>