ntfs3(loop3): failed to convert name for inode 1e. ntfs3(loop3): ino=1f, mi_enum_attr ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.3.5304/28023 is trying to acquire lock: ffff88807c6229f8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:601 but task is already holding lock: ffff88804041f0f8 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline] ffff88804041f0f8 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ntfs_readdir+0x749/0xec0 fs/ntfs3/dir.c:499 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ni->ni_lock#2/5){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x19d/0x1550 kernel/locking/mutex.c:821 ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline] attr_data_get_block+0x1bf/0x2a0 fs/ntfs3/attrib.c:976 ntfs_file_mmap_prepare+0x5b0/0xa20 fs/ntfs3/file.c:430 vfs_mmap_prepare include/linux/fs.h:2071 [inline] call_mmap_prepare mm/vma.c:2672 [inline] __mmap_region mm/vma.c:2758 [inline] mmap_region+0xe5a/0x2310 mm/vma.c:2860 do_mmap+0xc3b/0x10c0 mm/mmap.c:560 vm_mmap_pgoff+0x272/0x4e0 mm/util.c:581 ksys_mmap_pgoff+0x4dc/0x760 mm/mmap.c:606 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&mm->mmap_lock){++++}-{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+0x1520/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 down_read_killable+0x50/0x3b0 kernel/locking/rwsem.c:1599 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:601 get_mmap_lock_carefully mm/mmap_lock.c:450 [inline] lock_mm_and_find_vma+0x2d6/0x340 mm/mmap_lock.c:501 do_user_addr_fault+0x341/0x1340 arch/x86/mm/fault.c:1366 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 filldir64+0x2bc/0x620 fs/readdir.c:-1 dir_emit include/linux/fs.h:3587 [inline] ntfs_dir_emit fs/ntfs3/dir.c:346 [inline] ntfs_read_hdr+0x8a4/0xc10 fs/ntfs3/dir.c:387 ntfs_readdir+0x9e1/0xec0 fs/ntfs3/dir.c:547 iterate_dir+0x2e2/0x4d0 fs/readdir.c:110 __do_sys_getdents64 fs/readdir.c:399 [inline] __se_sys_getdents64+0xf1/0x280 fs/readdir.c:384 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ni->ni_lock#2/5); lock(&mm->mmap_lock); lock(&ni->ni_lock#2/5); rlock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz.3.5304/28023: #0: ffff8880542b49b0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320 fs/file.c:1259 #1: ffff88804041f380 (&type->i_mutex_dir_key#18){++++}-{4:4}, at: iterate_dir+0x209/0x4d0 fs/readdir.c:103 #2: ffff88804041f0f8 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline] #2: ffff88804041f0f8 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ntfs_readdir+0x749/0xec0 fs/ntfs3/dir.c:499 stack backtrace: CPU: 0 UID: 0 PID: 28023 Comm: syz.3.5304 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043 check_noncircular+0x12e/0x150 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+0x1520/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 down_read_killable+0x50/0x3b0 kernel/locking/rwsem.c:1599 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:601 get_mmap_lock_carefully mm/mmap_lock.c:450 [inline] lock_mm_and_find_vma+0x2d6/0x340 mm/mmap_lock.c:501 do_user_addr_fault+0x341/0x1340 arch/x86/mm/fault.c:1366 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0010:filldir64+0x2bc/0x620 fs/readdir.c:369 Code: ea b7 79 ff 0f 01 cb 48 8b 44 24 28 49 89 47 08 48 bd 00 00 00 00 00 fc ff df 48 8b 44 24 58 48 89 03 8b 4c 24 04 48 8d 43 10 <66> 89 08 8b 4c 24 14 80 e1 0f 48 8d 43 12 88 08 4a 8d 04 2b 48 83 RSP: 0018:ffffc90004f2fab0 EFLAGS: 00050297 RAX: 0000200000001000 RBX: 0000200000000ff0 RCX: 0000000000000020 RDX: ffff888032f95d00 RSI: 0000000000000005 RDI: 0000000000000007 RBP: dffffc0000000000 R08: ffff888032f95d07 R09: 1ffff110065f2ba0 R10: dffffc0000000000 R11: ffffed10065f2ba1 R12: ffff888052354000 R13: 0000000000000005 R14: 0000000000000005 R15: 0000200000000fd0 dir_emit include/linux/fs.h:3587 [inline] ntfs_dir_emit fs/ntfs3/dir.c:346 [inline] ntfs_read_hdr+0x8a4/0xc10 fs/ntfs3/dir.c:387 ntfs_readdir+0x9e1/0xec0 fs/ntfs3/dir.c:547 iterate_dir+0x2e2/0x4d0 fs/readdir.c:110 __do_sys_getdents64 fs/readdir.c:399 [inline] __se_sys_getdents64+0xf1/0x280 fs/readdir.c:384 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa38b99de99 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:00007fa38c89e028 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007fa38bc25fa0 RCX: 00007fa38b99de99 RDX: 0000000000001000 RSI: 0000200000000f80 RDI: 0000000000000009 RBP: 00007fa38ba33eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa38bc26038 R14: 00007fa38bc25fa0 R15: 00007ffc60a63f28 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: b7 79 mov $0x79,%bh 2: ff 0f decl (%rdi) 4: 01 cb add %ecx,%ebx 6: 48 8b 44 24 28 mov 0x28(%rsp),%rax b: 49 89 47 08 mov %rax,0x8(%r15) f: 48 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%rbp 16: fc ff df 19: 48 8b 44 24 58 mov 0x58(%rsp),%rax 1e: 48 89 03 mov %rax,(%rbx) 21: 8b 4c 24 04 mov 0x4(%rsp),%ecx 25: 48 8d 43 10 lea 0x10(%rbx),%rax * 29: 66 89 08 mov %cx,(%rax) <-- trapping instruction 2c: 8b 4c 24 14 mov 0x14(%rsp),%ecx 30: 80 e1 0f and $0xf,%cl 33: 48 8d 43 12 lea 0x12(%rbx),%rax 37: 88 08 mov %cl,(%rax) 39: 4a 8d 04 2b lea (%rbx,%r13,1),%rax 3d: 48 rex.W 3e: 83 .byte 0x83