syzbot

======================================================
WARNING: possible circular locking dependency detected
6.1.141-syzkaller #0 Not tainted
------------------------------------------------------
syz.4.192/5196 is trying to acquire lock:
ffff0000d5b9c348 (&mm->mmap_lock){++++}-{3:3}, at: get_current arch/arm64/include/asm/current.h:19 [inline]
ffff0000d5b9c348 (&mm->mmap_lock){++++}-{3:3}, at: internal_get_user_pages_fast+0x120/0x1a70 mm/gup.c:3042

but task is already holding lock:
ffff0000e195c600 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
ffff0000e195c600 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}, at: __blockdev_direct_IO+0x2c8/0x318c fs/direct-io.c:1162

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}:
       down_write+0x5c/0x88 kernel/locking/rwsem.c:1573
       inode_lock include/linux/fs.h:758 [inline]
       ntfs_file_mmap+0x3e8/0x55c fs/ntfs3/file.c:320
       call_mmap include/linux/fs.h:2270 [inline]
       mmap_file+0x6c/0xc8 mm/util.c:1109
       __mmap_region mm/mmap.c:2760 [inline]
       mmap_region+0xcc8/0x1860 mm/mmap.c:2904
       do_mmap+0x978/0x10dc mm/mmap.c:1424
       vm_mmap_pgoff+0x184/0x284 mm/util.c:520
       ksys_mmap_pgoff+0x3b8/0x5a0 mm/mmap.c:1470
       __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline]
       __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline]
       __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

-> #0 (&mm->mmap_lock){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3090 [inline]
       check_prevs_add kernel/locking/lockdep.c:3209 [inline]
       validate_chain kernel/locking/lockdep.c:3825 [inline]
       __lock_acquire+0x293c/0x6544 kernel/locking/lockdep.c:5049
       lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662
       internal_get_user_pages_fast+0x164/0x1a70 mm/gup.c:3042
       get_user_pages_fast+0x60/0x94 mm/gup.c:3150
       __iov_iter_get_pages_alloc+0x2e0/0x800 lib/iov_iter.c:1460
       iov_iter_get_pages2+0x74/0xbc lib/iov_iter.c:1503
       dio_refill_pages fs/direct-io.c:172 [inline]
       dio_get_page fs/direct-io.c:215 [inline]
       do_direct_IO fs/direct-io.c:932 [inline]
       __blockdev_direct_IO+0xc74/0x318c fs/direct-io.c:1266
       blockdev_direct_IO include/linux/fs.h:3342 [inline]
       ntfs_direct_IO+0x174/0x324 fs/ntfs3/inode.c:798
       generic_file_read_iter+0x3f8/0x5a8 mm/filemap.c:2891
       ntfs_file_read_iter+0x184/0x1e0 fs/ntfs3/file.c:768
       call_read_iter include/linux/fs.h:2259 [inline]
       new_sync_read fs/read_write.c:389 [inline]
       vfs_read+0x5ac/0x7c4 fs/read_write.c:470
       ksys_read+0x120/0x210 fs/read_write.c:613
       __do_sys_read fs/read_write.c:623 [inline]
       __se_sys_read fs/read_write.c:621 [inline]
       __arm64_sys_read+0x7c/0x90 fs/read_write.c:621
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&sb->s_type->i_mutex_key#28);
                               lock(&mm->mmap_lock);
                               lock(&sb->s_type->i_mutex_key#28);
  lock(&mm->mmap_lock);

 *** DEADLOCK ***

2 locks held by syz.4.192/5196:
 #0: ffff0000d27b40e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x114/0x16c fs/file.c:1040
 #1: ffff0000e195c600 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
 #1: ffff0000e195c600 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}, at: __blockdev_direct_IO+0x2c8/0x318c fs/direct-io.c:1162

stack backtrace:
CPU: 1 PID: 5196 Comm: syz.4.192 Not tainted 6.1.141-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2048
 check_noncircular+0x240/0x2d4 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 kernel/locking/lockdep.c:3825 [inline]
 __lock_acquire+0x293c/0x6544 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662
 internal_get_user_pages_fast+0x164/0x1a70 mm/gup.c:3042
 get_user_pages_fast+0x60/0x94 mm/gup.c:3150
 __iov_iter_get_pages_alloc+0x2e0/0x800 lib/iov_iter.c:1460
 iov_iter_get_pages2+0x74/0xbc lib/iov_iter.c:1503
 dio_refill_pages fs/direct-io.c:172 [inline]
 dio_get_page fs/direct-io.c:215 [inline]
 do_direct_IO fs/direct-io.c:932 [inline]
 __blockdev_direct_IO+0xc74/0x318c fs/direct-io.c:1266
 blockdev_direct_IO include/linux/fs.h:3342 [inline]
 ntfs_direct_IO+0x174/0x324 fs/ntfs3/inode.c:798
 generic_file_read_iter+0x3f8/0x5a8 mm/filemap.c:2891
 ntfs_file_read_iter+0x184/0x1e0 fs/ntfs3/file.c:768
 call_read_iter include/linux/fs.h:2259 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x5ac/0x7c4 fs/read_write.c:470
 ksys_read+0x120/0x210 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __arm64_sys_read+0x7c/0x90 fs/read_write.c:621
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585