Date: Thu, 9 Dec 2021 13:03:23 +0100 From: Peter <pmc@citylink.dinoex.sub.org> To: Eugene Grosbein <eugen@grosbein.net> Cc: Peter <pmc@citylink.dinoex.sub.org>, freebsd-stable@freebsd.org Subject: Re: 12.3: "swapon -a" crashes the system Message-ID: <YbHwi6tUS8WACtbp@gate.intra.daemon.contact> In-Reply-To: <d08240dc-4b19-9cce-f909-115b91ae5593@grosbein.net> References: <YbGd/AkA1KfjeGv5@gate.intra.daemon.contact> <d08240dc-4b19-9cce-f909-115b91ae5593@grosbein.net>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, Dec 09, 2021 at 02:35:55PM +0700, Eugene Grosbein wrote: ! 09.12.2021 13:11, Peter wrote: ! ! > if you run out of swapspace and you think you might just create ! > some extra devices and add them to /etc/fstab and then run "swapon -a" ! > to enable them, don't do that. ! > ! > The result might look like this: ! > kernel: pid 12296 (daemon), jid 5, uid 5100: exited on signal 10 (core dumped) ! > kernel: pid 17717 (ruby27), jid 5, uid 5100: exited on signal 6 (core dumped) ! > kernel: pid 14938 (daemon), jid 10, uid 5100: exited on signal 10 (core dumped) ! > kernel: pid 19184 (ruby27), jid 10, uid 5100: exited on signal 11 (core dumped) ! > kernel: pid 19182 (ruby27), jid 10, uid 5100: exited on signal 10 (core dumped) ! > ... ! > with a subsequent kernel crash. ! > ! > In my case I did run out of swapspace despite proper sizing, because ! > of unbalanced numa-domains. (Each of them may hit free_target on their ! > own behalf, and then start paging.) ! > ! > So I did as described above, but I added them with the "late" option, ! > and then did run "swapon -a", which did not even add them - but ! > nevertheless produced the crash. The processes that do coredump might ! > be those that are fully swapped out? ! ! Did you try using ZFS-backed files or devices for swap? If so, this is somewhat expected. Hi Eugene, that's a negative: # cat /etc/fstab /dev/ada3p3 / ufs rw 1 1 /dev/ada3p4 /usr ufs rw 1 2 /dev/ada3p5 /var ufs rw 1 2 proc /proc procfs rw 0 0 /dev/ada1p2.eli none swap sw,trimonce 0 0 /dev/ada3p2.eli none swap sw,trimonce,late 0 0 /dev/ada1p10.eli none swap sw,trimonce,late 0 0 /dev/ada3p10.eli none swap sw,trimonce,late 0 0 ... And it happened two times: first when I ran into exhaustion and found some space on a spinning to quickly add. And second after I had figured out the numa matter, reassessed my calculations, and added proper SSD space. cheerio, PMc
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?YbHwi6tUS8WACtbp>