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9 Apr 2021
8 Apr 2021
How to fix?
github.com/rclone/rclone/vfs/vfscache/downloaders to version 1.54.0 or higher.
github.com/rclone/rclone/vfs/vfscache/downloaders is a rsync for cloud storage.
Affected versions of this package are vulnerable to Deadlock. The
downloaders.Close() call acquires the downloaders' mutex before calling the wait group
wait and the main downloaders' thread has a periodical (5 seconds interval) call to kick its waiters, and the waiter dispatch function tries to get the mutex. A deadlock can occur if the
Close() call starts and gets the mutex, while the main downloader thread already got the timer's tick and proceeded to call
kickWaiters. The deadlock happens when the
Close call gets the mutex between the timer's kick and when the main downloaders' thread gets the mutex first.