In the Linux kernel, the following vulnerability has been resolved: ntfs3: fix circular locking dependency in run_unpack_ex Syzbot reported a circular locking dependency between wnd-rw_lock (sbi-used.bitmap) and ni-file.run_lock. The deadlock scenario: 1. ntfs_extend_mft() takes ni-file.run_lock then wnd-rw_lock. 2. run_unpack_ex() takes wnd-rw_lock then tries to acquire ni-file.run_lock inside ntfs_refresh_zone(). This creates an AB-BA deadlock.

Fix this by using down_read_trylock() instead of down_read() when acquiring run_lock in run_unpack_ex(). If the lock is contended, skip ntfs_refresh_zone() - the MFT zone will be refreshed on the next MFT operation. This breaks the circular dependency since we never block waiting for run_lock while holding wnd-rw_lock.