loop6: detected capacity change from 0 to 4096
======================================================
WARNING: possible circular locking dependency detected
6.17.0-rc1-syzkaller #0 Not tainted
------------------------------------------------------
syz.6.2781/14430 is trying to acquire lock:
ffff888053cc8538 (mapping.invalidate_lock#7){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline]
ffff888053cc8538 (mapping.invalidate_lock#7){++++}-{4:4}, at: filemap_fault+0x2d8/0x2930 mm/filemap.c:3433

but task is already holding lock:
ffff888026012220 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:453 [inline]
ffff888026012220 (&mm->mmap_lock){++++}-{4:4}, at: __mm_populate+0x21f/0x380 mm/gup.c:1962

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&mm->mmap_lock){++++}-{4:4}:
       __might_fault mm/memory.c:6958 [inline]
       __might_fault+0x113/0x190 mm/memory.c:6952
       _inline_copy_to_user include/linux/uaccess.h:192 [inline]
       _copy_to_user+0x2d/0xd0 lib/usercopy.c:26
       copy_to_user include/linux/uaccess.h:225 [inline]
       fiemap_fill_next_extent+0x239/0x390 fs/ioctl.c:145
       ni_fiemap+0x94e/0xbf0 fs/ntfs3/frecord.c:1985
       ntfs_fiemap+0x144/0x170 fs/ntfs3/file.c:1326
       ioctl_fiemap fs/ioctl.c:220 [inline]
       do_vfs_ioctl+0x447/0x14f0 fs/ioctl.c:532
       __do_sys_ioctl fs/ioctl.c:596 [inline]
       __se_sys_ioctl fs/ioctl.c:584 [inline]
       __x64_sys_ioctl+0x114/0x210 fs/ioctl.c:584
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&ni->ni_lock#3/5){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/mutex.c:598 [inline]
       __mutex_lock+0x193/0x10b0 kernel/locking/mutex.c:760
       ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline]
       ntfs_fallocate+0xcaa/0x1170 fs/ntfs3/file.c:616
       vfs_fallocate+0x5b4/0x10e0 fs/open.c:342
       ksys_fallocate fs/open.c:366 [inline]
       __do_sys_fallocate fs/open.c:371 [inline]
       __se_sys_fallocate fs/open.c:369 [inline]
       __x64_sys_fallocate+0xd5/0x150 fs/open.c:369
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (mapping.invalidate_lock#7){++++}-{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+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237
       lock_acquire kernel/locking/lockdep.c:5868 [inline]
       lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
       down_read+0x9b/0x480 kernel/locking/rwsem.c:1537
       filemap_invalidate_lock_shared include/linux/fs.h:934 [inline]
       filemap_fault+0x2d8/0x2930 mm/filemap.c:3433
       __do_fault+0x10d/0x490 mm/memory.c:5152
       do_read_fault mm/memory.c:5573 [inline]
       do_fault mm/memory.c:5707 [inline]
       do_pte_missing+0xf50/0x3ba0 mm/memory.c:4234
       handle_pte_fault mm/memory.c:6052 [inline]
       __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
       handle_mm_fault+0x589/0xd10 mm/memory.c:6364
       faultin_page mm/gup.c:1144 [inline]
       __get_user_pages+0x551/0x34a0 mm/gup.c:1446
       populate_vma_page_range+0x267/0x3f0 mm/gup.c:1880
       __mm_populate+0x1d8/0x380 mm/gup.c:1983
       mm_populate include/linux/mm.h:3367 [inline]
       vm_mmap_pgoff+0x37f/0x470 mm/util.c:585
       ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:604
       __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
       __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
       __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0x4c0 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:
  mapping.invalidate_lock#7 --> &ni->ni_lock#3/5 --> &mm->mmap_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  rlock(&mm->mmap_lock);
                               lock(&ni->ni_lock#3/5);
                               lock(&mm->mmap_lock);
  rlock(mapping.invalidate_lock#7);

 *** DEADLOCK ***

1 lock held by syz.6.2781/14430:
 #0: ffff888026012220 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:453 [inline]
 #0: ffff888026012220 (&mm->mmap_lock){++++}-{4:4}, at: __mm_populate+0x21f/0x380 mm/gup.c:1962

stack backtrace:
CPU: 0 UID: 0 PID: 14430 Comm: syz.6.2781 Not tainted 6.17.0-rc1-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2043
 check_noncircular+0x14c/0x170 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+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
 down_read+0x9b/0x480 kernel/locking/rwsem.c:1537
 filemap_invalidate_lock_shared include/linux/fs.h:934 [inline]
 filemap_fault+0x2d8/0x2930 mm/filemap.c:3433
 __do_fault+0x10d/0x490 mm/memory.c:5152
 do_read_fault mm/memory.c:5573 [inline]
 do_fault mm/memory.c:5707 [inline]
 do_pte_missing+0xf50/0x3ba0 mm/memory.c:4234
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
 handle_mm_fault+0x589/0xd10 mm/memory.c:6364
 faultin_page mm/gup.c:1144 [inline]
 __get_user_pages+0x551/0x34a0 mm/gup.c:1446
 populate_vma_page_range+0x267/0x3f0 mm/gup.c:1880
 __mm_populate+0x1d8/0x380 mm/gup.c:1983
 mm_populate include/linux/mm.h:3367 [inline]
 vm_mmap_pgoff+0x37f/0x470 mm/util.c:585
 ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:604
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd26f38ebe9
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:00007fd2701bf038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fd26f5b5fa0 RCX: 00007fd26f38ebe9
RDX: 000000000000000a RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007fd26f411e19 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd26f5b6038 R14: 00007fd26f5b5fa0 R15: 00007fffd1517c38
 </TASK>