https://bugzilla.novell.com/show_bug.cgi?id=757783
https://bugzilla.novell.com/show_bug.cgi?id=757783#c39
--- Comment #39 from Mike Galbraith 2012-05-06 10:32:41 UTC ---
As if this bug wasn't annoying enough just to trace, applying the fix is
annoying too. Including proc_fs.h in fork.c breaks kABI in SLE11-SP2 for some
reason. Have to double check 12.1, then push both.
To put the final touches on this bug, namespaces are flat not amenable to the
high frequency fork/exit/waitpid usage vsftpd is apparently doing. Children
call synchronize_rcu() on exit, making them stick around for a while, and
worse, the parent calls rcu_barrier() on each and every unmount while reaping
since d863b50ab 2.6.38-rc5, meaning 1 child per tick is all it can reap. With
many children to reap, zombies persist for ages as targets of readdir() in
procfs, bloating cache.
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