syzbot

======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc1-syzkaller-00306-g27cc6fdf7201 #0 Not tainted
------------------------------------------------------
syz-executor651/5239 is trying to acquire lock:
ffff888079afc5b0 (&sb->s_type->i_mutex_key#14){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline]
ffff888079afc5b0 (&sb->s_type->i_mutex_key#14){+.+.}-{3:3}, at: ntfs_file_mmap+0x5bc/0x850 fs/ntfs3/file.c:367

but task is already holding lock:
ffff88807d1ca798 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:122 [inline]
ffff88807d1ca798 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x17c/0x3d0 mm/util.c:586

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:5825
       down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1547
       mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153
       get_mmap_lock_carefully mm/memory.c:6108 [inline]
       lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6159
       do_user_addr_fault arch/x86/mm/fault.c:1361 [inline]
       handle_page_fault arch/x86/mm/fault.c:1481 [inline]
       exc_page_fault+0x1bf/0x8c0 arch/x86/mm/fault.c:1539
       asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
       fault_in_readable+0x108/0x2b0 mm/gup.c:2227
       fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94
       generic_perform_write+0x259/0x6d0 mm/filemap.c:4044
       ntfs_file_write_iter+0x65f/0x740 fs/ntfs3/file.c:1192
       new_sync_write fs/read_write.c:590 [inline]
       vfs_write+0xa6d/0xc90 fs/read_write.c:683
       ksys_write+0x183/0x2b0 fs/read_write.c:736
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&sb->s_type->i_mutex_key#14){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
       __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
       down_write+0x99/0x220 kernel/locking/rwsem.c:1577
       inode_lock include/linux/fs.h:815 [inline]
       ntfs_file_mmap+0x5bc/0x850 fs/ntfs3/file.c:367
       call_mmap include/linux/fs.h:2172 [inline]
       mmap_region+0x1add/0x2990 mm/mmap.c:1440
       do_mmap+0x8f0/0x1000 mm/mmap.c:496
       vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588
       ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:542
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 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(&sb->s_type->i_mutex_key#14);
                               lock(&mm->mmap_lock);
  lock(&sb->s_type->i_mutex_key#14);

 *** DEADLOCK ***

1 lock held by syz-executor651/5239:
 #0: ffff88807d1ca798 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:122 [inline]
 #0: ffff88807d1ca798 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x17c/0x3d0 mm/util.c:586

stack backtrace:
CPU: 1 UID: 0 PID: 5239 Comm: syz-executor651 Not tainted 6.12.0-rc1-syzkaller-00306-g27cc6fdf7201 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
 down_write+0x99/0x220 kernel/locking/rwsem.c:1577
 inode_lock include/linux/fs.h:815 [inline]
 ntfs_file_mmap+0x5bc/0x850 fs/ntfs3/file.c:367
 call_mmap include/linux/fs.h:2172 [inline]
 mmap_region+0x1add/0x2990 mm/mmap.c:1440
 do_mmap+0x8f0/0x1000 mm/mmap.c:496
 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588
 ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:542
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb5c9e80399
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 18 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:00007fb5c9e15208 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fb5c9f37718 RCX: 00007fb5c9e80399
RDX: 0000000000000002 RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007fb5c9f37710 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000028011 R11: 0000000000000246 R12: 00007fb5c9f03d70
R13: 0030656c69662f2e R14: 00007fb5c9efe468 R15: 7366656863616362
 </TASK>
------------[ cut here ]------------
kernel BUG at include/linux/highmem.h:275!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 5239 Comm: syz-executor651 Not tainted 6.12.0-rc1-syzkaller-00306-g27cc6fdf7201 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:zero_user_segments+0x28b/0x290 include/linux/highmem.h:275
Code: fe 01 e9 47 fe ff ff e8 13 73 a7 fe 89 ea be 00 10 00 00 48 c7 c7 90 3c cf 8e e8 90 70 fe 01 e9 d3 fe ff ff e8 f6 72 a7 fe 90 <0f> 0b 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3
RSP: 0018:ffffc90003cf7540 EFLAGS: 00010293
RAX: ffffffff82ed632a RBX: ffffea0001c45040 RCX: ffff888078a35a00
RDX: 0000000000000000 RSI: 0000000000001038 RDI: 0000000000001000
RBP: 0000000000001000 R08: ffffffff82ed6165 R09: 1ffffd4000388a08
R10: dffffc0000000000 R11: fffff94000388a09 R12: 0000000000001038
R13: 0000000000000000 R14: 1ffffd4000388a08 R15: 0000000000001038
FS:  00007fb5c9e156c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 0000000076ffc000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 folio_zero_range include/linux/highmem.h:647 [inline]
 ntfs_extend_initialized_size+0x50b/0x950 fs/ntfs3/file.c:215
 ntfs_file_mmap+0x5f2/0x850 fs/ntfs3/file.c:368
 call_mmap include/linux/fs.h:2172 [inline]
 mmap_region+0x1add/0x2990 mm/mmap.c:1440
 do_mmap+0x8f0/0x1000 mm/mmap.c:496
 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588
 ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:542
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb5c9e80399
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 18 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:00007fb5c9e15208 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fb5c9f37718 RCX: 00007fb5c9e80399
RDX: 0000000000000002 RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007fb5c9f37710 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000028011 R11: 0000000000000246 R12: 00007fb5c9f03d70
R13: 0030656c69662f2e R14: 00007fb5c9efe468 R15: 7366656863616362
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:zero_user_segments+0x28b/0x290 include/linux/highmem.h:275
Code: fe 01 e9 47 fe ff ff e8 13 73 a7 fe 89 ea be 00 10 00 00 48 c7 c7 90 3c cf 8e e8 90 70 fe 01 e9 d3 fe ff ff e8 f6 72 a7 fe 90 <0f> 0b 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3
RSP: 0018:ffffc90003cf7540 EFLAGS: 00010293
RAX: ffffffff82ed632a RBX: ffffea0001c45040 RCX: ffff888078a35a00
RDX: 0000000000000000 RSI: 0000000000001038 RDI: 0000000000001000
RBP: 0000000000001000 R08: ffffffff82ed6165 R09: 1ffffd4000388a08
R10: dffffc0000000000 R11: fffff94000388a09 R12: 0000000000001038
R13: 0000000000000000 R14: 1ffffd4000388a08 R15: 0000000000001038
FS:  00007fb5c9e156c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005561861110a8 CR3: 0000000076ffc000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400