[OpenIndiana-discuss] Swap/stack space continuously shrinking

[Till Wegmüller]

Hi Markus

This happens when the Memory Of the Machine runs out.
It is named swap but it is an in memory Filesystem that is mounted at
boot on these specific directories. (Much like TMPFS on Linux)

Have you overcomited the RAM?

Hope this helps
Greetings
Till

On 21.02.2018 12:27, Markus Wernig wrote:
> Hi all
> 
> I have 2 OI installations in kvm/qemu virtual machines. Both are showing
> the same symptom: The available swap/stack space is continuously
> decreasing, up to the point (roughly every 6-7 weeks) where none is left
> and no new processes can be forked. Meaning a forced reboot, as also no
> login shells can be spawned any more.
> I have already moved /tmp to a separate dataset in the global zone (and
> to plain directories within the two other zones).
> 
> What I see is a slow, continuous decrease in the sisze of all file
> systems marked as swap (~6.5 GB after reboot):
> 
> df -h | grep swap over the last 24 hours:
> 
> swap               6.45G  1020K      6.45G     1%    /etc/svc/volatile
> swap               6.45G    60K      6.45G     1%    /var/run
> ..
> swap               5.94G  1020K      5.94G     1%    /etc/svc/volatile
> swap               5.94G    60K      5.94G     1%    /var/run
> ..
> swap               5.89G   204K      5.89G     1%    /etc/svc/volatile
> swap               5.89G    12K      5.89G     1%    /var/run
> ..
> swap               5.62G   204K      5.62G     1%    /etc/svc/volatile
> swap               5.62G    12K      5.62G     1%    /var/run
> ..
> swap               5.04G  1020K      5.04G     1%    /etc/svc/volatile
> swap               5.04G    48K      5.04G     1%    /var/run
> 
> The swap device on the other hand remains stable:
> 
> # swap -lh
> swapfile             dev    swaplo   blocks     free
> /dev/zvol/dsk/rpool/swap 270,2        4K     512M     512M
> 
> As nothing seems to get stored in that space, I assume it must be used
> by something else (processes not freeing it).
> 
> Does anybody have an idea on how to start debugging this? All I get in
> the log files are these messages, starting some hours before the boxes
> stand still:
> 
> Feb 14 03:51:09 xfer-srv05 tmpfs: [ID 518458 kern.warning] WARNING:
> /etc/svc/volatile: File system full, swap space limit exceeded
> Feb 14 03:51:10 xfer-srv05 last message repeated 1 time
> Feb 14 04:03:20 xfer-srv05 genunix: [ID 470503 kern.warning] WARNING:
> Sorry, no swap space to grow stack for pid 8106 (httpd)
> Feb 14 04:28:36 xfer-srv05 genunix: [ID 470503 kern.warning] WARNING:
> Sorry, no swap space to grow stack for pid 8920 (httpd)
> Feb 14 05:58:20 xfer-srv05 genunix: [ID 470503 kern.warning] WARNING:
> Sorry, no swap space to grow stack for pid 11050 (httpd)
> Feb 14 05:58:24 xfer-srv05 last message repeated 1 time
> 
> Thanks for any ideas.
> 
> /markus
> 
> 
> 
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