====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.138/4773 is trying to acquire lock: ffff88805f71b550 (&ni->file.run_lock#3){++++}-{3:3}, at: attr_data_get_block+0x148/0x18d0 fs/ntfs3/attrib.c:831 but task is already holding lock: ffff88807b434028 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline] ffff88807b434028 (&mm->mmap_lock){++++}-{3:3}, at: do_mbind mm/mempolicy.c:1299 [inline] ffff88807b434028 (&mm->mmap_lock){++++}-{3:3}, at: kernel_mbind mm/mempolicy.c:1472 [inline] ffff88807b434028 (&mm->mmap_lock){++++}-{3:3}, at: __do_sys_mbind mm/mempolicy.c:1479 [inline] ffff88807b434028 (&mm->mmap_lock){++++}-{3:3}, at: __se_sys_mbind+0x452/0x770 mm/mempolicy.c:1475 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xb3/0x110 mm/memory.c:5357 _copy_to_user+0x29/0x130 lib/usercopy.c:35 copy_to_user include/linux/uaccess.h:200 [inline] fiemap_fill_next_extent+0x1ba/0x390 fs/ioctl.c:144 ni_fiemap+0x915/0xc50 fs/ntfs3/frecord.c:2044 ntfs_fiemap+0xd7/0x130 fs/ntfs3/file.c:1236 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x152d/0x1ef0 fs/ioctl.c:814 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (&ni->file.run_lock#3){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c42/0x7d10 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 attr_data_get_block+0x148/0x18d0 fs/ntfs3/attrib.c:831 ntfs_get_block_vbo+0x329/0xca0 fs/ntfs3/inode.c:593 __block_write_full_page+0x378/0x11a0 fs/buffer.c:1764 writeout mm/migrate.c:837 [inline] fallback_migrate_page mm/migrate.c:861 [inline] move_to_new_page+0x8c6/0xe60 mm/migrate.c:912 __unmap_and_move mm/migrate.c:1077 [inline] unmap_and_move mm/migrate.c:1218 [inline] migrate_pages+0x1db4/0x31d0 mm/migrate.c:1495 do_mbind mm/mempolicy.c:1325 [inline] kernel_mbind mm/mempolicy.c:1472 [inline] __do_sys_mbind mm/mempolicy.c:1479 [inline] __se_sys_mbind+0x64c/0x770 mm/mempolicy.c:1475 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_lock); lock(&ni->file.run_lock#3); lock(&mm->mmap_lock); lock(&ni->file.run_lock#3); *** DEADLOCK *** 1 lock held by syz.0.138/4773: #0: ffff88807b434028 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:71 [inline] #0: ffff88807b434028 (&mm->mmap_lock){++++}-{3:3}, at: do_mbind mm/mempolicy.c:1299 [inline] #0: ffff88807b434028 (&mm->mmap_lock){++++}-{3:3}, at: kernel_mbind mm/mempolicy.c:1472 [inline] #0: ffff88807b434028 (&mm->mmap_lock){++++}-{3:3}, at: __do_sys_mbind mm/mempolicy.c:1479 [inline] #0: ffff88807b434028 (&mm->mmap_lock){++++}-{3:3}, at: __se_sys_mbind+0x452/0x770 mm/mempolicy.c:1475 stack backtrace: CPU: 0 PID: 4773 Comm: syz.0.138 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c42/0x7d10 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 attr_data_get_block+0x148/0x18d0 fs/ntfs3/attrib.c:831 ntfs_get_block_vbo+0x329/0xca0 fs/ntfs3/inode.c:593 __block_write_full_page+0x378/0x11a0 fs/buffer.c:1764 writeout mm/migrate.c:837 [inline] fallback_migrate_page mm/migrate.c:861 [inline] move_to_new_page+0x8c6/0xe60 mm/migrate.c:912 __unmap_and_move mm/migrate.c:1077 [inline] unmap_and_move mm/migrate.c:1218 [inline] migrate_pages+0x1db4/0x31d0 mm/migrate.c:1495 do_mbind mm/mempolicy.c:1325 [inline] kernel_mbind mm/mempolicy.c:1472 [inline] __do_sys_mbind mm/mempolicy.c:1479 [inline] __se_sys_mbind+0x64c/0x770 mm/mempolicy.c:1475 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fd87e9b5cb9 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:00007fd87cc11028 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed RAX: ffffffffffffffda RBX: 00007fd87ec30fa0 RCX: 00007fd87e9b5cb9 RDX: 0000000000000000 RSI: 0000000000800000 RDI: 0000200000001000 RBP: 00007fd87ea23bf7 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd87ec31038 R14: 00007fd87ec30fa0 R15: 00007ffdb6893c08