syzbot

======================================================
WARNING: possible circular locking dependency detected
6.1.115-syzkaller #0 Not tainted
------------------------------------------------------
syz.6.1872/11723 is trying to acquire lock:
ffff888057543180 (mapping.invalidate_lock#7){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:813 [inline]
ffff888057543180 (mapping.invalidate_lock#7){++++}-{3:3}, at: filemap_fault+0x640/0x17e0 mm/filemap.c:3219

but task is already holding lock:
ffff8880290e4c58 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
ffff8880290e4c58 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline]
ffff8880290e4c58 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x2e/0x2e0 mm/memory.c:5382

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&mm->mmap_lock){++++}-{3:3}:
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       __might_fault+0xbd/0x110 mm/memory.c:5851
       _copy_to_user+0x26/0x130 lib/usercopy.c:36
       copy_to_user include/linux/uaccess.h:169 [inline]
       ni_fiemap+0x1672/0x18a0 fs/ntfs3/frecord.c:2138
       ntfs_fiemap+0x12e/0x170 fs/ntfs3/file.c:1246
       ioctl_fiemap fs/ioctl.c:219 [inline]
       do_vfs_ioctl+0x18e9/0x2a90 fs/ioctl.c:810
       __do_sys_ioctl fs/ioctl.c:868 [inline]
       __se_sys_ioctl+0x81/0x160 fs/ioctl.c:856
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #1 (&ni->ni_lock/4){+.+.}-{3:3}:
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       __mutex_lock_common kernel/locking/mutex.c:603 [inline]
       __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747
       ni_lock fs/ntfs3/ntfs_fs.h:1101 [inline]
       ntfs_fallocate+0x539/0x1020 fs/ntfs3/file.c:598
       vfs_fallocate+0x547/0x6b0 fs/open.c:323
       ksys_fallocate fs/open.c:346 [inline]
       __do_sys_fallocate fs/open.c:354 [inline]
       __se_sys_fallocate fs/open.c:352 [inline]
       __x64_sys_fallocate+0xb9/0x100 fs/open.c:352
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (mapping.invalidate_lock#7){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3090 [inline]
       check_prevs_add kernel/locking/lockdep.c:3209 [inline]
       validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
       __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       down_read+0xad/0xa30 kernel/locking/rwsem.c:1520
       filemap_invalidate_lock_shared include/linux/fs.h:813 [inline]
       filemap_fault+0x640/0x17e0 mm/filemap.c:3219
       __do_fault+0x136/0x4f0 mm/memory.c:4278
       do_read_fault mm/memory.c:4629 [inline]
       do_fault mm/memory.c:4758 [inline]
       handle_pte_fault mm/memory.c:5029 [inline]
       __handle_mm_fault mm/memory.c:5171 [inline]
       handle_mm_fault+0x3410/0x5340 mm/memory.c:5292
       do_user_addr_fault arch/x86/mm/fault.c:1340 [inline]
       handle_page_fault arch/x86/mm/fault.c:1431 [inline]
       exc_page_fault+0x26f/0x620 arch/x86/mm/fault.c:1487
       asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
       strncpy_from_user+0x159/0x360 lib/strncpy_from_user.c:139
       getname_flags+0xf5/0x4f0 fs/namei.c:150
       do_sys_openat2+0xd2/0x4f0 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+0x243/0x290 fs/open.c:1345
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

other info that might help us debug this:

Chain exists of:
  mapping.invalidate_lock#7 --> &ni->ni_lock/4 --> &mm->mmap_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&mm->mmap_lock);
                               lock(&ni->ni_lock/4);
                               lock(&mm->mmap_lock);
  lock(mapping.invalidate_lock#7);

 *** DEADLOCK ***

1 lock held by syz.6.1872/11723:
 #0: ffff8880290e4c58 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
 #0: ffff8880290e4c58 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline]
 #0: ffff8880290e4c58 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x2e/0x2e0 mm/memory.c:5382

stack backtrace:
CPU: 0 PID: 11723 Comm: syz.6.1872 Not tainted 6.1.115-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 check_noncircular+0x2fa/0x3b0 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+0x1661/0x5950 kernel/locking/lockdep.c:3825
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
 down_read+0xad/0xa30 kernel/locking/rwsem.c:1520
 filemap_invalidate_lock_shared include/linux/fs.h:813 [inline]
 filemap_fault+0x640/0x17e0 mm/filemap.c:3219
 __do_fault+0x136/0x4f0 mm/memory.c:4278
 do_read_fault mm/memory.c:4629 [inline]
 do_fault mm/memory.c:4758 [inline]
 handle_pte_fault mm/memory.c:5029 [inline]
 __handle_mm_fault mm/memory.c:5171 [inline]
 handle_mm_fault+0x3410/0x5340 mm/memory.c:5292
 do_user_addr_fault arch/x86/mm/fault.c:1340 [inline]
 handle_page_fault arch/x86/mm/fault.c:1431 [inline]
 exc_page_fault+0x26f/0x620 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+0x159/0x360 lib/strncpy_from_user.c:139
Code: 26 fd 48 83 fd 07 0f 86 af 00 00 00 4c 89 64 24 08 4c 89 7c 24 10 48 c7 44 24 18 f8 ff ff ff 45 31 ed 4d 89 f4 48 8b 44 24 08 <4e> 8b 3c 28 48 b8 ff fe fe fe fe fe fe fe 49 8d 1c 07 4d 89 fe 49
RSP: 0018:ffffc900044c7c90 EFLAGS: 00050246
RAX: 0000000020000040 RBX: 00007fffffffe020 RCX: ffff888025601dc0
RDX: ffffc90005713000 RSI: 0000000000000fe0 RDI: 0000000000000007
RBP: 0000000000000fe0 R08: ffffffff84647cf1 R09: fffff94000302481
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888060496620
R13: 0000000000000000 R14: ffff888060496620 R15: 0000000000000fe0
 getname_flags+0xf5/0x4f0 fs/namei.c:150
 do_sys_openat2+0xd2/0x4f0 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+0x243/0x290 fs/open.c:1345
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f398e37e719
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:00007f398f0bf038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f398e536058 RCX: 00007f398e37e719
RDX: 000000000000275a RSI: 0000000020000040 RDI: ffffffffffffff9c
RBP: 00007f398e3f139e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f398e536058 R15: 00007ffd132bdca8
 </TASK>
----------------
Code disassembly (best guess):
   0:	26 fd                	es std
   2:	48 83 fd 07          	cmp    $0x7,%rbp
   6:	0f 86 af 00 00 00    	jbe    0xbb
   c:	4c 89 64 24 08       	mov    %r12,0x8(%rsp)
  11:	4c 89 7c 24 10       	mov    %r15,0x10(%rsp)
  16:	48 c7 44 24 18 f8 ff 	movq   $0xfffffffffffffff8,0x18(%rsp)
  1d:	ff ff
  1f:	45 31 ed             	xor    %r13d,%r13d
  22:	4d 89 f4             	mov    %r14,%r12
  25:	48 8b 44 24 08       	mov    0x8(%rsp),%rax
* 2a:	4e 8b 3c 28          	mov    (%rax,%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