syzbot

======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.1.907/15309 is trying to acquire lock:
ffff8880368847b0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:601

but task is already holding lock:
ffff88803f9ccce0 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline]
ffff88803f9ccce0 (&ni->ni_lock#2/5){+.+.}-{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#2/5){+.+.}-{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#10){.+.+}-{4:4}:
       down_read+0x97/0x200 kernel/locking/rwsem.c:1574
       filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline]
       filemap_fault+0xa61/0x13c0 mm/filemap.c:3589
       __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
       stac arch/x86/include/asm/smap.h:-1 [inline]
       filldir64+0x29e/0x620 fs/readdir.c:365
       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_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:

Chain exists of:
  &mm->mmap_lock --> mapping.invalidate_lock#10 --> &ni->ni_lock#2/5

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ni->ni_lock#2/5);
                               lock(mapping.invalidate_lock#10);
                               lock(&ni->ni_lock#2/5);
  rlock(&mm->mmap_lock);

 *** DEADLOCK ***

3 locks held by syz.1.907/15309:
 #0: ffff88801167f928 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x252/0x320 fs/file.c:1259
 #1: ffff88803f9ccf98 (&type->i_mutex_dir_key#9){++++}-{4:4}, at: iterate_dir+0x215/0x4e0 fs/readdir.c:103
 #2: ffff88803f9ccce0 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1222 [inline]
 #2: ffff88803f9ccce0 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ntfs_readdir+0x752/0xec0 fs/ntfs3/dir.c:499

stack backtrace:
CPU: 1 UID: 0 PID: 15309 Comm: syz.1.907 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
Call Trace:
 <TASK>
 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:filldir64+0x29e/0x620 fs/readdir.c:367
Code: df 49 29 ef 48 b8 00 f0 ff ff ff 7f 00 00 49 39 c7 4c 0f 47 f8 bf 07 00 00 00 44 89 f6 e8 fa 96 82 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
RSP: 0018:ffffc900045a7ab0 EFLAGS: 00050297
RAX: 00000000000008c0 RBX: 0000000000000000 RCX: ffff8880266c5d00
RDX: 0000000000000002 RSI: 0000000000000009 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff8242a3b0 R12: ffff88806b99e000
R13: 0000000000000009 R14: 0000000000000009 R15: 0000000000000000
 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_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: 0033:0x7ff5c3c6de99
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:00007ff5c1ec6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007ff5c3ef5fa0 RCX: 00007ff5c3c6de99
RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007ff5c3d03eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff5c3ef6038 R14: 00007ff5c3ef5fa0 R15: 00007fff0f2c6b08
 </TASK>
----------------
Code disassembly (best guess):
   0:	df 49 29             	fisttps 0x29(%rcx)
   3:	ef                   	out    %eax,(%dx)
   4:	48 b8 00 f0 ff ff ff 	movabs $0x7ffffffff000,%rax
   b:	7f 00 00
   e:	49 39 c7             	cmp    %rax,%r15
  11:	4c 0f 47 f8          	cmova  %rax,%r15
  15:	bf 07 00 00 00       	mov    $0x7,%edi
  1a:	44 89 f6             	mov    %r14d,%esi
  1d:	e8 fa 96 82 ff       	call   0xff82971c
  22:	0f 01 cb             	stac
  25:	48 8b 44 24 28       	mov    0x28(%rsp),%rax
* 2a:	49 89 47 08          	mov    %rax,0x8(%r15) <-- trapping instruction
  2e:	48 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%rbp
  35:	fc ff df
  38:	48 8b 44 24 58       	mov    0x58(%rsp),%rax
  3d:	48 89 03             	mov    %rax,(%rbx)