loop6: detected capacity change from 0 to 4096 ====================================================== WARNING: possible circular locking dependency detected 6.16.0-syzkaller-12256-g561c80369df0 #0 Not tainted ------------------------------------------------------ syz.6.1397/10213 is trying to acquire lock: ffff888053bae078 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline] ffff888053bae078 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: attr_data_get_block+0x303/0x1d10 fs/ntfs3/attrib.c:918 but task is already holding lock: ffff88807d71b7a0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline] ffff88807d71b7a0 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1f5/0x470 mm/util.c:578 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&mm->mmap_lock){++++}-{4:4}: __might_fault mm/memory.c:6958 [inline] __might_fault+0x113/0x190 mm/memory.c:6952 _inline_copy_to_user include/linux/uaccess.h:192 [inline] _copy_to_user+0x2d/0xd0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] fiemap_fill_next_extent+0x239/0x390 fs/ioctl.c:145 ni_fiemap+0x94e/0xbf0 fs/ntfs3/frecord.c:1985 ntfs_fiemap+0x144/0x170 fs/ntfs3/file.c:1326 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x447/0x14f0 fs/ioctl.c:532 __do_sys_ioctl fs/ioctl.c:596 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __x64_sys_ioctl+0x114/0x210 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&ni->ni_lock#2/5){+.+.}-{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+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x193/0x10b0 kernel/locking/mutex.c:760 ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline] attr_data_get_block+0x303/0x1d10 fs/ntfs3/attrib.c:918 ntfs_file_mmap_prepare+0x5ba/0x800 fs/ntfs3/file.c:318 vfs_mmap_prepare include/linux/fs.h:2294 [inline] call_mmap_prepare mm/vma.c:2585 [inline] __mmap_region+0xee5/0x27b0 mm/vma.c:2653 mmap_region+0x32b/0x3f0 mm/vma.c:2739 do_mmap+0xa3e/0x1210 mm/mmap.c:558 vm_mmap_pgoff+0x29e/0x470 mm/util.c:580 ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:604 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 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(&mm->mmap_lock); lock(&ni->ni_lock#2/5); lock(&mm->mmap_lock); lock(&ni->ni_lock#2/5); *** DEADLOCK *** 1 lock held by syz.6.1397/10213: #0: ffff88807d71b7a0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline] #0: ffff88807d71b7a0 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1f5/0x470 mm/util.c:578 stack backtrace: CPU: 1 UID: 0 PID: 10213 Comm: syz.6.1397 Not tainted 6.16.0-syzkaller-12256-g561c80369df0 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2043 check_noncircular+0x14c/0x170 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+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x193/0x10b0 kernel/locking/mutex.c:760 ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline] attr_data_get_block+0x303/0x1d10 fs/ntfs3/attrib.c:918 ntfs_file_mmap_prepare+0x5ba/0x800 fs/ntfs3/file.c:318 vfs_mmap_prepare include/linux/fs.h:2294 [inline] call_mmap_prepare mm/vma.c:2585 [inline] __mmap_region+0xee5/0x27b0 mm/vma.c:2653 mmap_region+0x32b/0x3f0 mm/vma.c:2739 do_mmap+0xa3e/0x1210 mm/mmap.c:558 vm_mmap_pgoff+0x29e/0x470 mm/util.c:580 ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:604 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8a35b8ebe9 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:00007f8a36ace038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f8a35db5fa0 RCX: 00007f8a35b8ebe9 RDX: 8088e3ad122bc192 RSI: 0000000000003000 RDI: 0000200000444000 RBP: 00007f8a35c11e19 R08: 0000000000000004 R09: 0000000001000000 R10: 0000000004002011 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8a35db6038 R14: 00007f8a35db5fa0 R15: 00007ffd3031bdd8