====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.218/5398 is trying to acquire lock: ffff88807065bc00 (&ni->ni_lock/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1102 [inline] ffff88807065bc00 (&ni->ni_lock/5){+.+.}-{3:3}, at: ntfs_read_folio+0x17c/0x200 fs/ntfs3/inode.c:725 but task is already holding lock: ffff88807065c040 (mapping.invalidate_lock#8){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:813 [inline] ffff88807065c040 (mapping.invalidate_lock#8){.+.+}-{3:3}, at: filemap_fault+0xa05/0x1670 mm/filemap.c:3235 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (mapping.invalidate_lock#8){.+.+}-{3:3}: down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520 filemap_invalidate_lock_shared include/linux/fs.h:813 [inline] filemap_fault+0x53c/0x1670 mm/filemap.c:3220 __do_fault+0x13b/0x4e0 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+0x1a93/0x3e60 mm/memory.c:5294 do_user_addr_fault+0x51f/0xb10 arch/x86/mm/fault.c:1340 handle_page_fault arch/x86/mm/fault.c:1431 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1487 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608 -> #1 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xc2/0x120 mm/memory.c:5852 _copy_to_user+0x27/0x130 lib/usercopy.c:36 copy_to_user include/linux/uaccess.h:169 [inline] ni_fiemap+0x4ec/0x1300 fs/ntfs3/frecord.c:2140 ntfs_fiemap+0xd7/0x130 fs/ntfs3/file.c:1173 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x1425/0x1d10 fs/ioctl.c:810 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #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+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x120/0xaf0 kernel/locking/mutex.c:747 ni_lock fs/ntfs3/ntfs_fs.h:1102 [inline] ntfs_read_folio+0x17c/0x200 fs/ntfs3/inode.c:725 filemap_read_folio+0x160/0x760 mm/filemap.c:2490 filemap_fault+0xdcb/0x1670 mm/filemap.c:3313 __do_fault+0x13b/0x4e0 mm/memory.c:4280 do_read_fault mm/memory.c:4631 [inline] do_fault mm/memory.c:4760 [inline] handle_pte_fault mm/memory.c:5031 [inline] __handle_mm_fault mm/memory.c:5173 [inline] handle_mm_fault+0x28bf/0x3e60 mm/memory.c:5294 do_user_addr_fault+0x51f/0xb10 arch/x86/mm/fault.c:1340 handle_page_fault arch/x86/mm/fault.c:1431 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1487 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608 do_strncpy_from_user lib/strncpy_from_user.c:-1 [inline] strncpy_from_user+0x14b/0x350 lib/strncpy_from_user.c:139 getname_flags+0xf2/0x500 fs/namei.c:150 do_sys_openat2+0xcf/0x490 fs/open.c:1312 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1345 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: &ni->ni_lock/5 --> &mm->mmap_lock --> mapping.invalidate_lock#8 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(mapping.invalidate_lock#8); lock(&mm->mmap_lock); lock(mapping.invalidate_lock#8); lock(&ni->ni_lock/5); *** DEADLOCK *** 1 lock held by syz.0.218/5398: #0: ffff88807065c040 (mapping.invalidate_lock#8){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:813 [inline] #0: ffff88807065c040 (mapping.invalidate_lock#8){.+.+}-{3:3}, at: filemap_fault+0xa05/0x1670 mm/filemap.c:3235 stack backtrace: CPU: 0 PID: 5398 Comm: syz.0.218 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 check_noncircular+0x274/0x310 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+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x120/0xaf0 kernel/locking/mutex.c:747 ni_lock fs/ntfs3/ntfs_fs.h:1102 [inline] ntfs_read_folio+0x17c/0x200 fs/ntfs3/inode.c:725 filemap_read_folio+0x160/0x760 mm/filemap.c:2490 filemap_fault+0xdcb/0x1670 mm/filemap.c:3313 __do_fault+0x13b/0x4e0 mm/memory.c:4280 do_read_fault mm/memory.c:4631 [inline] do_fault mm/memory.c:4760 [inline] handle_pte_fault mm/memory.c:5031 [inline] __handle_mm_fault mm/memory.c:5173 [inline] handle_mm_fault+0x28bf/0x3e60 mm/memory.c:5294 do_user_addr_fault+0x51f/0xb10 arch/x86/mm/fault.c:1340 handle_page_fault arch/x86/mm/fault.c:1431 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1487 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608 RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] RIP: 0010:strncpy_from_user+0x14b/0x350 lib/strncpy_from_user.c:139 Code: 4c 89 e6 e8 07 9d 52 fd 49 83 fc 07 0f 86 a1 00 00 00 4c 89 74 24 08 48 c7 44 24 10 f8 ff ff ff 45 31 ed 4c 89 3c 24 48 89 dd <4f> 8b 3c 2f 48 b8 ff fe fe fe fe fe fe fe 49 8d 1c 07 4d 89 fe 49 RSP: 0018:ffffc90003567d20 EFLAGS: 00050246 RAX: ffffffff842e3d39 RBX: ffff88802f6bb320 RCX: ffff888030510000 RDX: 0000000000000002 RSI: 0000000000000fe0 RDI: 0000000000000007 RBP: ffff88802f6bb320 R08: dffffc0000000000 R09: fffff9400017b5c1 R10: fffff9400017b5c1 R11: 1ffffd400017b5c0 R12: 0000000000000fe0 R13: 0000000000000000 R14: 0000000000000fe0 R15: 0000200000000040 getname_flags+0xf2/0x500 fs/namei.c:150 do_sys_openat2+0xcf/0x490 fs/open.c:1312 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1345 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f999518efc9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9995fae038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f99953e5fa0 RCX: 00007f999518efc9 RDX: 0000000000000000 RSI: 0000200000000040 RDI: ffffffffffffff9c RBP: 00007f9995211f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f99953e6038 R14: 00007f99953e5fa0 R15: 00007ffed7fb06a8 ---------------- Code disassembly (best guess): 0: 4c 89 e6 mov %r12,%rsi 3: e8 07 9d 52 fd call 0xfd529d0f 8: 49 83 fc 07 cmp $0x7,%r12 c: 0f 86 a1 00 00 00 jbe 0xb3 12: 4c 89 74 24 08 mov %r14,0x8(%rsp) 17: 48 c7 44 24 10 f8 ff movq $0xfffffffffffffff8,0x10(%rsp) 1e: ff ff 20: 45 31 ed xor %r13d,%r13d 23: 4c 89 3c 24 mov %r15,(%rsp) 27: 48 89 dd mov %rbx,%rbp * 2a: 4f 8b 3c 2f mov (%r15,%r13,1),%r15 <-- trapping instruction 2e: 48 b8 ff fe fe fe fe movabs $0xfefefefefefefeff,%rax 35: fe fe fe 38: 49 8d 1c 07 lea (%r15,%rax,1),%rbx 3c: 4d 89 fe mov %r15,%r14 3f: 49 rex.WB