[GIT PULL] Please pull proc fixes for v5.7-rc2

[Eric W. Biederman]

Linus,

Please pull the for-linus branch from the git tree:

   git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git for-linus

   HEAD: 4fa3b1c417377c352208ee9f487e17cfcee32348 proc: Handle umounts cleanly

While running syzbot happened to spot one more oversight in my rework of
proc_flush_task.  The fields proc_self and proc_thread_self were not
being reinitialized on when proc was unmounted, which could cause
problems if the mount of proc fails.

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