syzbot

ntfs3(loop0): Different NTFS sector size (2048) and media sector size (512).
ntfs3(loop0): Failed to initialize $Extend/$ObjId.
======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc7-syzkaller-ga2392f333575 #0 Not tainted
------------------------------------------------------
syz-executor212/6443 is trying to acquire lock:
ffff0000c6be0a50 (&mm->mmap_lock){++++}-{4:4}, at: __might_fault+0x9c/0x124 mm/memory.c:6838

but task is already holding lock:
ffff0000db7f7680 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1111 [inline]
ffff0000db7f7680 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ntfs_fiemap+0xec/0x168 fs/ntfs3/file.c:1358

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&ni->ni_lock#2/5){+.+.}-{4:4}:
       __mutex_lock_common+0x1f0/0x24b8 kernel/locking/mutex.c:585
       __mutex_lock kernel/locking/mutex.c:730 [inline]
       mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:782
       ni_lock fs/ntfs3/ntfs_fs.h:1111 [inline]
       ntfs_fallocate+0x5b4/0xfd0 fs/ntfs3/file.c:695
       vfs_fallocate+0x578/0x6c0 fs/open.c:338
       ksys_fallocate fs/open.c:362 [inline]
       __do_sys_fallocate fs/open.c:367 [inline]
       __se_sys_fallocate fs/open.c:365 [inline]
       __arm64_sys_fallocate+0xc0/0x110 fs/open.c:365
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
       do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
       el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
       el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

-> #1 (&sb->s_type->i_mutex_key#16){+.+.}-{4:4}:
       down_write+0x50/0xc0 kernel/locking/rwsem.c:1577
       inode_lock include/linux/fs.h:877 [inline]
       ntfs_file_mmap+0x48c/0x6b8 fs/ntfs3/file.c:379
       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:2461 [inline]
       mmap_region+0x1ae0/0x2518 mm/vma.c:2539
       do_mmap+0xbc8/0x1150 mm/mmap.c:561
       vm_mmap_pgoff+0x30c/0x4ac mm/util.c:578
       ksys_mmap_pgoff+0x3a4/0x5c8 mm/mmap.c:607
       __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline]
       __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline]
       __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
       do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
       el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
       el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

-> #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 kernel/locking/lockdep.c:3906 [inline]
       __lock_acquire+0x34f0/0x7904 kernel/locking/lockdep.c:5228
       lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5851
       __might_fault+0xc4/0x124 mm/memory.c:6839
       _inline_copy_to_user include/linux/uaccess.h:192 [inline]
       copy_to_user include/linux/uaccess.h:223 [inline]
       fiemap_fill_next_extent+0x1d0/0x45c fs/ioctl.c:145
       ni_fiemap+0xc1c/0xe20 fs/ntfs3/frecord.c:1953
       ntfs_fiemap+0x110/0x168 fs/ntfs3/file.c:1360
       ioctl_fiemap fs/ioctl.c:220 [inline]
       do_vfs_ioctl+0x1b28/0x2724 fs/ioctl.c:840
       __do_sys_ioctl fs/ioctl.c:904 [inline]
       __se_sys_ioctl fs/ioctl.c:892 [inline]
       __arm64_sys_ioctl+0xe4/0x1cc fs/ioctl.c:892
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
       do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
       el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
       el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

other info that might help us debug this:

Chain exists of:
  &mm->mmap_lock --> &sb->s_type->i_mutex_key#16 --> &ni->ni_lock#2/5

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ni->ni_lock#2/5);
                               lock(&sb->s_type->i_mutex_key#16);
                               lock(&ni->ni_lock#2/5);
  rlock(&mm->mmap_lock);

 *** DEADLOCK ***

1 lock held by syz-executor212/6443:
 #0: ffff0000db7f7680 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1111 [inline]
 #0: ffff0000db7f7680 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ntfs_fiemap+0xec/0x168 fs/ntfs3/file.c:1358

stack backtrace:
CPU: 1 UID: 0 PID: 6443 Comm: syz-executor212 Not tainted 6.14.0-rc7-syzkaller-ga2392f333575 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 print_circular_bug+0x154/0x1c0 kernel/locking/lockdep.c:2076
 check_noncircular+0x310/0x404 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 kernel/locking/lockdep.c:3906 [inline]
 __lock_acquire+0x34f0/0x7904 kernel/locking/lockdep.c:5228
 lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5851
 __might_fault+0xc4/0x124 mm/memory.c:6839
 _inline_copy_to_user include/linux/uaccess.h:192 [inline]
 copy_to_user include/linux/uaccess.h:223 [inline]
 fiemap_fill_next_extent+0x1d0/0x45c fs/ioctl.c:145
 ni_fiemap+0xc1c/0xe20 fs/ntfs3/frecord.c:1953
 ntfs_fiemap+0x110/0x168 fs/ntfs3/file.c:1360
 ioctl_fiemap fs/ioctl.c:220 [inline]
 do_vfs_ioctl+0x1b28/0x2724 fs/ioctl.c:840
 __do_sys_ioctl fs/ioctl.c:904 [inline]
 __se_sys_ioctl fs/ioctl.c:892 [inline]
 __arm64_sys_ioctl+0xe4/0x1cc fs/ioctl.c:892
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600