ntfs3: loop6: ino=21, "cgroup.controllers" attr_set_size ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.6.423/6234 is trying to acquire lock: ffff0000fc154360 (&ni->ni_lock/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1102 [inline] ffff0000fc154360 (&ni->ni_lock/5){+.+.}-{3:3}, at: ntfs_read_folio+0x140/0x1c0 fs/ntfs3/inode.c:725 but task is already holding lock: ffff0000fc1547a0 (mapping.invalidate_lock#5){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:813 [inline] ffff0000fc1547a0 (mapping.invalidate_lock#5){.+.+}-{3:3}, at: filemap_create_folio mm/filemap.c:2611 [inline] ffff0000fc1547a0 (mapping.invalidate_lock#5){.+.+}-{3:3}, at: filemap_get_pages mm/filemap.c:2672 [inline] ffff0000fc1547a0 (mapping.invalidate_lock#5){.+.+}-{3:3}, at: filemap_read+0x85c/0x1fd8 mm/filemap.c:2759 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (mapping.invalidate_lock#5){.+.+}-{3:3}: down_read+0x64/0x304 kernel/locking/rwsem.c:1520 filemap_invalidate_lock_shared include/linux/fs.h:813 [inline] filemap_fault+0x33c/0xe8c mm/filemap.c:3220 __do_fault+0x11c/0x3d8 mm/memory.c:4280 do_shared_fault mm/memory.c:4686 [inline] do_fault mm/memory.c:4764 [inline] handle_pte_fault mm/memory.c:5031 [inline] __handle_mm_fault mm/memory.c:5173 [inline] handle_mm_fault+0x11b8/0x2ff0 mm/memory.c:5294 __do_page_fault arch/arm64/mm/fault.c:499 [inline] do_page_fault+0x310/0x99c arch/arm64/mm/fault.c:583 do_translation_fault+0x94/0xc8 arch/arm64/mm/fault.c:667 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:804 el0_da+0x70/0x154 arch/arm64/kernel/entry-common.c:515 el0t_64_sync_handler+0x90/0xf0 arch/arm64/kernel/entry-common.c:658 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #1 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xc4/0x124 mm/memory.c:5852 _copy_to_user include/linux/uaccess.h:143 [inline] copy_to_user include/linux/uaccess.h:169 [inline] ni_fiemap+0x3fc/0x1030 fs/ntfs3/frecord.c:2140 ntfs_fiemap+0xe4/0x140 fs/ntfs3/file.c:1173 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x1694/0x206c 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+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 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:585 -> #0 (&ni->ni_lock/5){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x293c/0x6544 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662 __mutex_lock_common+0x190/0x1f38 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:1102 [inline] ntfs_read_folio+0x140/0x1c0 fs/ntfs3/inode.c:725 filemap_read_folio+0x130/0x37c mm/filemap.c:2490 filemap_create_folio mm/filemap.c:2619 [inline] filemap_get_pages mm/filemap.c:2672 [inline] filemap_read+0xb7c/0x1fd8 mm/filemap.c:2759 generic_file_read_iter+0xf8/0x5a8 mm/filemap.c:2914 ntfs_file_read_iter+0x184/0x1e0 fs/ntfs3/file.c:771 call_read_iter include/linux/fs.h:2259 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x5ac/0x7c4 fs/read_write.c:470 ksys_read+0x120/0x210 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:621 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 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:585 other info that might help us debug this: Chain exists of: &ni->ni_lock/5 --> &mm->mmap_lock --> mapping.invalidate_lock#5 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(mapping.invalidate_lock#5); lock(&mm->mmap_lock); lock(mapping.invalidate_lock#5); lock(&ni->ni_lock/5); *** DEADLOCK *** 2 locks held by syz.6.423/6234: #0: ffff0000e652b4e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x114/0x16c fs/file.c:1038 #1: ffff0000fc1547a0 (mapping.invalidate_lock#5){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:813 [inline] #1: ffff0000fc1547a0 (mapping.invalidate_lock#5){.+.+}-{3:3}, at: filemap_create_folio mm/filemap.c:2611 [inline] #1: ffff0000fc1547a0 (mapping.invalidate_lock#5){.+.+}-{3:3}, at: filemap_get_pages mm/filemap.c:2672 [inline] #1: ffff0000fc1547a0 (mapping.invalidate_lock#5){.+.+}-{3:3}, at: filemap_read+0x85c/0x1fd8 mm/filemap.c:2759 stack backtrace: CPU: 1 PID: 6234 Comm: syz.6.423 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2048 check_noncircular+0x240/0x2d4 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x293c/0x6544 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662 __mutex_lock_common+0x190/0x1f38 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:1102 [inline] ntfs_read_folio+0x140/0x1c0 fs/ntfs3/inode.c:725 filemap_read_folio+0x130/0x37c mm/filemap.c:2490 filemap_create_folio mm/filemap.c:2619 [inline] filemap_get_pages mm/filemap.c:2672 [inline] filemap_read+0xb7c/0x1fd8 mm/filemap.c:2759 generic_file_read_iter+0xf8/0x5a8 mm/filemap.c:2914 ntfs_file_read_iter+0x184/0x1e0 fs/ntfs3/file.c:771 call_read_iter include/linux/fs.h:2259 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x5ac/0x7c4 fs/read_write.c:470 ksys_read+0x120/0x210 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:621 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 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:585