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We've encountered zombies that are waiting for a thread to exit that are looping in ep_poll() almost endlessly although there is a pending SIGKILL as a result of a group exit. This happens because we always find ep_events_available() and fetch more events and never are able to check for signal_pending() that would break from the loop and return -EINTR. Special case fatal signals and break immediately to guarantee that we loop to fetch more events and delay making a timely exit. It would also be possible to simply move the check for signal_pending() higher than checking for ep_events_available(), but there have been no reports of delayed signal handling other than SIGKILL preventing zombies from exiting that would be fixed by this. It fixes an issue for us where we have witnessed zombies sticking around for at least O(minutes), but considering the code has been like this forever and nobody else has complained that I have found, I would simply queue it up for 4.12. Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1705031722350.76784@chino.kir.corp.google.com Signed-off-by: David Rientjes <rientjes@google.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Jan Kara <jack@suse.cz> Cc: Davide Libenzi <davidel@xmailserver.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.