syzbot

======================================================
WARNING: possible circular locking dependency detected
6.9.0-rc7-syzkaller-00012-gdccb07f2914c #0 Not tainted
------------------------------------------------------
syz-executor751/5092 is trying to acquire lock:
ffff888077b0e8f0 (&ni->file.run_lock#3){++++}-{3:3}, at: attr_data_get_block+0x2e3/0x2e10 fs/ntfs3/attrib.c:902

but task is already holding lock:
ffff8880767094a0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:124 [inline]
ffff8880767094a0 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x182/0x420 mm/util.c:571

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&mm->mmap_lock){++++}-{3:3}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
       __might_fault+0xc6/0x120 mm/memory.c:6220
       _copy_to_user+0x2a/0xb0 lib/usercopy.c:36
       copy_to_user include/linux/uaccess.h:191 [inline]
       fiemap_fill_next_extent+0x235/0x410 fs/ioctl.c:145
       ni_fiemap+0xa5e/0x1230 fs/ntfs3/frecord.c:2065
       ntfs_fiemap+0x132/0x180 fs/ntfs3/file.c:1206
       ioctl_fiemap fs/ioctl.c:220 [inline]
       do_vfs_ioctl+0x1c07/0x2e50 fs/ioctl.c:838
       __do_sys_ioctl fs/ioctl.c:902 [inline]
       __se_sys_ioctl+0x81/0x170 fs/ioctl.c:890
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ni->file.run_lock#3){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869
       __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
       down_read+0xb1/0xa40 kernel/locking/rwsem.c:1526
       attr_data_get_block+0x2e3/0x2e10 fs/ntfs3/attrib.c:902
       ntfs_file_mmap+0x50b/0x890 fs/ntfs3/file.c:294
       call_mmap include/linux/fs.h:2115 [inline]
       mmap_region+0xf3f/0x1e50 mm/mmap.c:2820
       do_mmap+0x7af/0xe60 mm/mmap.c:1385
       vm_mmap_pgoff+0x1e3/0x420 mm/util.c:573
       ksys_mmap_pgoff+0x504/0x6e0 mm/mmap.c:1431
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&mm->mmap_lock);
                               lock(&ni->file.run_lock#3);
                               lock(&mm->mmap_lock);
  rlock(&ni->file.run_lock#3);

 *** DEADLOCK ***

1 lock held by syz-executor751/5092:
 #0: ffff8880767094a0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:124 [inline]
 #0: ffff8880767094a0 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x182/0x420 mm/util.c:571

stack backtrace:
CPU: 0 PID: 5092 Comm: syz-executor751 Not tainted 6.9.0-rc7-syzkaller-00012-gdccb07f2914c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869
 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
 down_read+0xb1/0xa40 kernel/locking/rwsem.c:1526
 attr_data_get_block+0x2e3/0x2e10 fs/ntfs3/attrib.c:902
 ntfs_file_mmap+0x50b/0x890 fs/ntfs3/file.c:294
 call_mmap include/linux/fs.h:2115 [inline]
 mmap_region+0xf3f/0x1e50 mm/mmap.c:2820
 do_mmap+0x7af/0xe60 mm/mmap.c:1385
 vm_mmap_pgoff+0x1e3/0x420 mm/util.c:573
 ksys_mmap_pgoff+0x504/0x6e0 mm/mmap.c:1431
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f17db5bf5e9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 1a 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f17db550208 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f17db6676f8 RCX: 00007f17db5bf5e9
RDX: 0000000000000002 RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007f17db6676f0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000028011 R11: 0000000000000246 R12: 00007f17db632ff8
R13: 00007f17db613052 R14: bcaefabb4aa2fce3 R15: 0032656c69662f2e
 </TASK>