====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.6.544/12977 is trying to acquire lock: ffff88805c489800 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline] ffff88805c489800 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_read_folio+0xba/0x200 fs/ntfs3/inode.c:727 but task is already holding lock: ffff88805c489c88 (mapping.invalidate_lock#12){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1045 [inline] ffff88805c489c88 (mapping.invalidate_lock#12){.+.+}-{4:4}, at: filemap_create_folio mm/filemap.c:2573 [inline] ffff88805c489c88 (mapping.invalidate_lock#12){.+.+}-{4:4}, at: filemap_get_pages+0xaff/0x1f00 mm/filemap.c:2644 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (mapping.invalidate_lock#12){.+.+}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_read+0x97/0x1f0 kernel/locking/rwsem.c:1537 filemap_invalidate_lock_shared include/linux/fs.h:1045 [inline] filemap_fault+0x5d9/0x12c0 mm/filemap.c:3477 __do_fault+0x138/0x390 mm/memory.c:5280 do_read_fault mm/memory.c:5698 [inline] do_fault mm/memory.c:5832 [inline] do_pte_missing mm/memory.c:4361 [inline] handle_pte_fault mm/memory.c:6177 [inline] __handle_mm_fault mm/memory.c:6318 [inline] handle_mm_fault+0x23c6/0x3400 mm/memory.c:6487 do_user_addr_fault+0x764/0x1380 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 do_strncpy_from_user lib/strncpy_from_user.c:-1 [inline] strncpy_from_user+0xb7/0x290 lib/strncpy_from_user.c:130 getname_flags+0xf3/0x540 fs/namei.c:157 getname include/linux/fs.h:2922 [inline] __do_sys_mkdirat fs/namei.c:4503 [inline] __se_sys_mkdirat fs/namei.c:4501 [inline] __x64_sys_mkdirat+0x7a/0xa0 fs/namei.c:4501 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&mm->mmap_lock){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __might_fault+0xcc/0x130 mm/memory.c:7081 _inline_copy_to_user include/linux/uaccess.h:192 [inline] _copy_to_user+0x2c/0xb0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] fiemap_fill_next_extent+0x1c0/0x390 fs/ioctl.c:144 ni_fiemap+0x391/0xbf0 fs/ntfs3/frecord.c:1896 ntfs_fiemap+0x11d/0x1a0 fs/ntfs3/file.c:1354 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x1188/0x1440 fs/ioctl.c:531 __do_sys_ioctl fs/ioctl.c:595 [inline] __se_sys_ioctl+0x82/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&ni->ni_lock/5){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/rtmutex_api.c:535 [inline] mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:547 ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline] ntfs_read_folio+0xba/0x200 fs/ntfs3/inode.c:727 filemap_read_folio+0x117/0x380 mm/filemap.c:2444 filemap_create_folio mm/filemap.c:2582 [inline] filemap_get_pages+0xc52/0x1f00 mm/filemap.c:2644 filemap_read+0x3f9/0x11a0 mm/filemap.c:2748 copy_splice_read+0x5da/0xa60 fs/splice.c:363 do_splice_read fs/splice.c:981 [inline] splice_direct_to_actor+0x4db/0xcd0 fs/splice.c:1086 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x187/0x270 fs/splice.c:1230 do_sendfile+0x4ec/0x7f0 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &ni->ni_lock/5 --> &mm->mmap_lock --> mapping.invalidate_lock#12 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(mapping.invalidate_lock#12); lock(&mm->mmap_lock); lock(mapping.invalidate_lock#12); lock(&ni->ni_lock/5); *** DEADLOCK *** 1 lock held by syz.6.544/12977: #0: ffff88805c489c88 (mapping.invalidate_lock#12){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1045 [inline] #0: ffff88805c489c88 (mapping.invalidate_lock#12){.+.+}-{4:4}, at: filemap_create_folio mm/filemap.c:2573 [inline] #0: ffff88805c489c88 (mapping.invalidate_lock#12){.+.+}-{4:4}, at: filemap_get_pages+0xaff/0x1f00 mm/filemap.c:2644 stack backtrace: CPU: 1 UID: 0 PID: 12977 Comm: syz.6.544 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043 check_noncircular+0x134/0x160 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+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/rtmutex_api.c:535 [inline] mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:547 ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline] ntfs_read_folio+0xba/0x200 fs/ntfs3/inode.c:727 filemap_read_folio+0x117/0x380 mm/filemap.c:2444 filemap_create_folio mm/filemap.c:2582 [inline] filemap_get_pages+0xc52/0x1f00 mm/filemap.c:2644 filemap_read+0x3f9/0x11a0 mm/filemap.c:2748 copy_splice_read+0x5da/0xa60 fs/splice.c:363 do_splice_read fs/splice.c:981 [inline] splice_direct_to_actor+0x4db/0xcd0 fs/splice.c:1086 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x187/0x270 fs/splice.c:1230 do_sendfile+0x4ec/0x7f0 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f49b076eec9 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:00007f49ae9ce038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f49b09c5fa0 RCX: 00007f49b076eec9 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005 RBP: 00007f49b07f1f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020fffe82 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f49b09c6038 R14: 00007f49b09c5fa0 R15: 00007ffdf7b49e58