ntfs3(loop4): Failed to initialize $Extend/$ObjId. ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.4.1089/7293 is trying to acquire lock: ffff8880358ef030 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:601 but task is already holding lock: ffff8880409617b8 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline] ffff8880409617b8 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_readdir+0x752/0xec0 fs/ntfs3/dir.c:499 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ni->ni_lock/5){+.+.}-{4:4}: __mutex_lock_common kernel/locking/rtmutex_api.c:559 [inline] mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:578 ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline] attr_data_get_block+0x1bf/0x2a0 fs/ntfs3/attrib.c:976 ntfs_iomap_begin+0x4f0/0xf10 fs/ntfs3/inode.c:771 iomap_iter+0x5f5/0xf80 fs/iomap/iter.c:110 iomap_readahead+0xa4a/0xe80 fs/iomap/buffered-io.c:721 ntfs_readahead+0x193/0x210 fs/ntfs3/inode.c:673 read_pages+0x193/0x5a0 mm/readahead.c:174 page_cache_ra_unbounded+0x679/0x8f0 mm/readahead.c:315 do_page_cache_ra mm/readahead.c:348 [inline] page_cache_ra_order+0x2c1/0x4a0 mm/readahead.c:558 filemap_get_pages+0x493/0x1e80 mm/filemap.c:2704 filemap_read+0x429/0x11e0 mm/filemap.c:2814 __kernel_read+0x4d3/0x970 fs/read_write.c:532 integrity_kernel_read+0x89/0xd0 security/integrity/iint.c:28 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:222 [inline] ima_calc_file_hash+0x45d/0x8a0 security/integrity/ima/ima_crypto.c:280 ima_collect_measurement+0x521/0xa10 security/integrity/ima/ima_api.c:300 process_measurement+0x1282/0x1c20 security/integrity/ima/ima_main.c:425 ima_file_check+0xe1/0x130 security/integrity/ima/ima_main.c:685 security_file_post_open+0xb3/0x260 security/security.c:2755 do_open fs/namei.c:4702 [inline] path_openat+0x2eac/0x3850 fs/namei.c:4863 do_file_open+0x23e/0x4a0 fs/namei.c:4892 do_sys_openat2+0x115/0x200 fs/open.c:1368 do_sys_open fs/open.c:1374 [inline] __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1385 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 -> #1 (mapping.invalidate_lock#4){++++}-{4:4}: down_read+0x97/0x200 kernel/locking/rwsem.c:1574 filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline] filemap_fault+0x6e0/0x13c0 mm/filemap.c:3570 __do_fault+0x138/0x2a0 mm/memory.c:5425 do_read_fault mm/memory.c:5860 [inline] do_fault mm/memory.c:5994 [inline] do_pte_missing+0x1828/0x28f0 mm/memory.c:4566 handle_pte_fault mm/memory.c:6379 [inline] __handle_mm_fault mm/memory.c:6517 [inline] handle_mm_fault+0xd28/0x13f0 mm/memory.c:6686 do_user_addr_fault+0x744/0x1340 arch/x86/mm/fault.c:1394 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 do_strncpy_from_user lib/strncpy_from_user.c:-1 [inline] strncpy_from_user+0xb7/0x2c0 lib/strncpy_from_user.c:130 do_getname+0x77/0x250 fs/namei.c:198 class_filename_flags_constructor include/linux/fs.h:2566 [inline] do_sys_openat2+0xcc/0x200 fs/open.c:1367 do_sys_open fs/open.c:1374 [inline] __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1385 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+0x1520/0x2ce0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 down_read_killable+0xa4/0x220 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 filldir+0x2bd/0x630 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+0x9ea/0xec0 fs/ntfs3/dir.c:547 iterate_dir+0x2f1/0x4e0 fs/readdir.c:110 __do_sys_getdents fs/readdir.c:319 [inline] __se_sys_getdents+0xf1/0x270 fs/readdir.c:304 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: Chain exists of: &mm->mmap_lock --> mapping.invalidate_lock#4 --> &ni->ni_lock/5 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ni->ni_lock/5); lock(mapping.invalidate_lock#4); lock(&ni->ni_lock/5); rlock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz.4.1089/7293: #0: ffff888041239d28 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x252/0x320 fs/file.c:1259 #1: ffff888040961a70 (&type->i_mutex_dir_key#9){++++}-{4:4}, at: iterate_dir+0x215/0x4e0 fs/readdir.c:103 #2: ffff8880409617b8 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline] #2: ffff8880409617b8 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_readdir+0x752/0xec0 fs/ntfs3/dir.c:499 stack backtrace: CPU: 1 UID: 0 PID: 7293 Comm: syz.4.1089 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 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+0x1520/0x2ce0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 down_read_killable+0xa4/0x220 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:filldir+0x2bd/0x630 fs/readdir.c:290 Code: 69 9c 82 ff 0f 01 cb 48 8b 44 24 20 49 89 47 08 48 bd 00 00 00 00 00 fc ff df 48 8b 44 24 40 48 89 03 8b 4c 24 04 48 8d 43 10 <66> 89 08 8b 54 24 14 80 e2 0f 89 c9 48 8d 04 0b 48 ff c8 88 10 48 RSP: 0018:ffffc90005147ab0 EFLAGS: 00050297 RAX: 0000200000002000 RBX: 0000200000001ff0 RCX: 0000000000000020 RDX: 0000000000000002 RSI: 0000000000000008 RDI: 0000000000000007 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed10051e6001 R12: ffff888020bde000 R13: 0000000000000008 R14: 0000000000000008 R15: 0000200000001fd8 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+0x9ea/0xec0 fs/ntfs3/dir.c:547 iterate_dir+0x2f1/0x4e0 fs/readdir.c:110 __do_sys_getdents fs/readdir.c:319 [inline] __se_sys_getdents+0xf1/0x270 fs/readdir.c:304 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: 0033:0x7fb6e581de99 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:00007fb6e3a76028 EFLAGS: 00000246 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 00007fb6e5aa5fa0 RCX: 00007fb6e581de99 RDX: 00000000000000b8 RSI: 0000200000001fc0 RDI: 0000000000000004 RBP: 00007fb6e58b3eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb6e5aa6038 R14: 00007fb6e5aa5fa0 R15: 00007ffd94b036b8 ---------------- Code disassembly (best guess): 0: 69 9c 82 ff 0f 01 cb imul $0x24448b48,-0x34fef001(%rdx,%rax,4),%ebx 7: 48 8b 44 24 b: 20 49 89 and %cl,-0x77(%rcx) e: 47 08 48 bd rex.RXB or %r9b,-0x43(%r8) 12: 00 00 add %al,(%rax) 14: 00 00 add %al,(%rax) 16: 00 fc add %bh,%ah 18: ff lcall (bad) 19: df 48 8b fisttps -0x75(%rax) 1c: 44 24 40 rex.R and $0x40,%al 1f: 48 89 03 mov %rax,(%rbx) 22: 8b 4c 24 04 mov 0x4(%rsp),%ecx 26: 48 8d 43 10 lea 0x10(%rbx),%rax * 2a: 66 89 08 mov %cx,(%rax) <-- trapping instruction 2d: 8b 54 24 14 mov 0x14(%rsp),%edx 31: 80 e2 0f and $0xf,%dl 34: 89 c9 mov %ecx,%ecx 36: 48 8d 04 0b lea (%rbx,%rcx,1),%rax 3a: 48 ff c8 dec %rax 3d: 88 10 mov %dl,(%rax) 3f: 48 rex.W