====================================================== WARNING: possible circular locking dependency detected 6.1.42-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/9525 is trying to acquire lock: ffff0001223d8860 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1109 [inline] ffff0001223d8860 (&ni->ni_lock/4){+.+.}-{3:3}, at: attr_data_get_block+0x330/0x1bdc fs/ntfs3/attrib.c:921 but task is already holding lock: ffff0000d865cf48 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] ffff0000d865cf48 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x15c/0x2b4 mm/util.c:518 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xc4/0x124 mm/memory.c:5801 _copy_to_user include/linux/uaccess.h:143 [inline] copy_to_user include/linux/uaccess.h:169 [inline] fiemap_fill_next_extent+0x1b4/0x424 fs/ioctl.c:144 ni_fiemap+0x7dc/0xe10 fs/ntfs3/frecord.c:2060 ntfs_fiemap+0x110/0x168 fs/ntfs3/file.c:1245 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x194c/0x26f8 fs/ioctl.c:810 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 -> #1 (&indx->run_lock){.+.+}-{3:3}: down_read+0x64/0x308 kernel/locking/rwsem.c:1520 indx_read+0x294/0xaec fs/ntfs3/index.c:1054 indx_find+0x400/0x9b8 fs/ntfs3/index.c:1162 dir_search_u+0x180/0x324 fs/ntfs3/dir.c:254 ntfs_lookup+0x108/0x1f8 fs/ntfs3/namei.c:83 __lookup_slow+0x250/0x374 fs/namei.c:1685 lookup_slow+0x60/0x84 fs/namei.c:1702 walk_component+0x280/0x36c fs/namei.c:1993 lookup_last fs/namei.c:2450 [inline] path_lookupat+0x13c/0x3d0 fs/namei.c:2474 filename_lookup+0x1d4/0x4e0 fs/namei.c:2503 user_path_at_empty+0x5c/0x1a4 fs/namei.c:2876 user_path_at include/linux/namei.h:57 [inline] do_mount fs/namespace.c:3380 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __arm64_sys_mount+0x428/0x594 fs/namespace.c:3568 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 -> #0 (&ni->ni_lock/4){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5056 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 ni_lock fs/ntfs3/ntfs_fs.h:1109 [inline] attr_data_get_block+0x330/0x1bdc fs/ntfs3/attrib.c:921 ntfs_file_mmap+0x3a4/0x688 fs/ntfs3/file.c:387 call_mmap include/linux/fs.h:2210 [inline] mmap_region+0xdd0/0x1a98 mm/mmap.c:2750 do_mmap+0xa00/0x1108 mm/mmap.c:1412 vm_mmap_pgoff+0x1a4/0x2b4 mm/util.c:520 ksys_mmap_pgoff+0x3c8/0x5b0 mm/mmap.c:1458 __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:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 other info that might help us debug this: Chain exists of: &ni->ni_lock/4 --> &indx->run_lock --> &mm->mmap_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_lock); lock(&indx->run_lock); lock(&mm->mmap_lock); lock(&ni->ni_lock/4); *** DEADLOCK *** 1 lock held by syz-executor.1/9525: #0: ffff0000d865cf48 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] #0: ffff0000d865cf48 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x15c/0x2b4 mm/util.c:518 stack backtrace: CPU: 0 PID: 9525 Comm: syz-executor.1 Not tainted 6.1.42-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2056 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5056 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 ni_lock fs/ntfs3/ntfs_fs.h:1109 [inline] attr_data_get_block+0x330/0x1bdc fs/ntfs3/attrib.c:921 ntfs_file_mmap+0x3a4/0x688 fs/ntfs3/file.c:387 call_mmap include/linux/fs.h:2210 [inline] mmap_region+0xdd0/0x1a98 mm/mmap.c:2750 do_mmap+0xa00/0x1108 mm/mmap.c:1412 vm_mmap_pgoff+0x1a4/0x2b4 mm/util.c:520 ksys_mmap_pgoff+0x3c8/0x5b0 mm/mmap.c:1458 __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:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581