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A flaw was found when a user with PID namespace mounting a FUSE filesystem, If the userspace component is terminated (pid 1), this results into a denial of service (DoS) problem. This internally makes the fuse requests go into Uninterruptiblein state until the system is rebooted. Reference: https://github.com/sargun/fuse-example
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1849006]
Possible fix: https://lore.kernel.org/lkml/0c3dde5aaaaba58125e026a93749ecae4fdf2316.1601562271.git.gladkov.alexey@gmail.com/