netlink: 8 bytes leftover after parsing attributes in process `syz.0.9'. ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.9/6719 is trying to acquire lock: ffff0000f94cc6c0 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline] ffff0000f94cc6c0 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_fault+0x434/0x1314 mm/filemap.c:3537 but task is already holding lock: ffff0000d4a90300 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:391 [inline] ffff0000d4a90300 (&mm->mmap_lock){++++}-{4:4}, at: __mm_populate+0x154/0x330 mm/gup.c:1942 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&mm->mmap_lock){++++}-{4:4}: __might_fault+0xc4/0x124 mm/memory.c:7174 _inline_copy_to_user include/linux/uaccess.h:201 [inline] copy_to_user include/linux/uaccess.h:234 [inline] fiemap_fill_next_extent+0x17c/0x3f0 fs/ioctl.c:144 ni_fiemap+0x6bc/0x9ec fs/ntfs3/frecord.c:1987 ntfs_fiemap+0x10c/0x188 fs/ntfs3/file.c:1419 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x1140/0x1834 fs/ioctl.c:531 __do_sys_ioctl fs/ioctl.c:595 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __arm64_sys_ioctl+0xe4/0x1c4 fs/ioctl.c:583 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #1 (&ni->ni_lock#2/5){+.+.}-{4:4}: __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:614 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 ni_lock fs/ntfs3/ntfs_fs.h:1127 [inline] attr_data_get_block+0x1e0/0x1864 fs/ntfs3/attrib.c:918 ntfs_get_block_vbo+0x2fc/0xb54 fs/ntfs3/inode.c:607 ntfs_get_block+0x84/0xc4 fs/ntfs3/inode.c:703 do_mpage_readpage+0x5cc/0x1624 fs/mpage.c:222 mpage_read_folio+0x120/0x1ec fs/mpage.c:395 ntfs_read_folio+0x180/0x1c0 fs/ntfs3/inode.c:745 filemap_read_folio+0xec/0x2f8 mm/filemap.c:2496 filemap_create_folio mm/filemap.c:2634 [inline] filemap_get_pages+0xa64/0x1a98 mm/filemap.c:2696 filemap_read+0x338/0xea8 mm/filemap.c:2800 generic_file_read_iter+0xa0/0x450 mm/filemap.c:2992 ntfs_file_read_iter+0x330/0x41c fs/ntfs3/file.c:954 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x670/0x93c fs/read_write.c:572 ksys_read+0x120/0x210 fs/read_write.c:715 __do_sys_read fs/read_write.c:724 [inline] __se_sys_read fs/read_write.c:722 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:722 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #0 (mapping.invalidate_lock#3){.+.+}-{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+0x1774/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x140/0x2e0 kernel/locking/lockdep.c:5868 down_read+0x58/0x308 kernel/locking/rwsem.c:1537 filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline] filemap_fault+0x434/0x1314 mm/filemap.c:3537 __do_fault+0x138/0x390 mm/memory.c:5320 do_read_fault mm/memory.c:5755 [inline] do_fault mm/memory.c:5889 [inline] do_pte_missing+0x174c/0x2c88 mm/memory.c:4401 handle_pte_fault mm/memory.c:6273 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0x1488/0x2678 mm/memory.c:6580 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x1b68/0x2dd0 mm/gup.c:1428 populate_vma_page_range+0x258/0x348 mm/gup.c:1860 __mm_populate+0x208/0x330 mm/gup.c:1963 mm_populate include/linux/mm.h:3701 [inline] vm_mmap_pgoff+0x398/0x45c mm/util.c:586 ksys_mmap_pgoff+0x394/0x5b8 mm/mmap.c:604 __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+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 other info that might help us debug this: Chain exists of: mapping.invalidate_lock#3 --> &ni->ni_lock#2/5 --> &mm->mmap_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&mm->mmap_lock); lock(&ni->ni_lock#2/5); lock(&mm->mmap_lock); rlock(mapping.invalidate_lock#3); *** DEADLOCK *** 1 lock held by syz.0.9/6719: #0: ffff0000d4a90300 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:391 [inline] #0: ffff0000d4a90300 (&mm->mmap_lock){++++}-{4:4}, at: __mm_populate+0x154/0x330 mm/gup.c:1942 stack backtrace: CPU: 0 UID: 0 PID: 6719 Comm: syz.0.9 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2043 check_noncircular+0x154/0x174 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+0x1774/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x140/0x2e0 kernel/locking/lockdep.c:5868 down_read+0x58/0x308 kernel/locking/rwsem.c:1537 filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline] filemap_fault+0x434/0x1314 mm/filemap.c:3537 __do_fault+0x138/0x390 mm/memory.c:5320 do_read_fault mm/memory.c:5755 [inline] do_fault mm/memory.c:5889 [inline] do_pte_missing+0x174c/0x2c88 mm/memory.c:4401 handle_pte_fault mm/memory.c:6273 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0x1488/0x2678 mm/memory.c:6580 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x1b68/0x2dd0 mm/gup.c:1428 populate_vma_page_range+0x258/0x348 mm/gup.c:1860 __mm_populate+0x208/0x330 mm/gup.c:1963 mm_populate include/linux/mm.h:3701 [inline] vm_mmap_pgoff+0x398/0x45c mm/util.c:586 ksys_mmap_pgoff+0x394/0x5b8 mm/mmap.c:604 __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+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596