Re: kmem leak in tmpmfs?

"Arno J. Klaassen" <arno@xxxxxxxxxxxxxxxxxxx> wrote:

Hello,

I get a very easy to reproduce panic on 6.1-STABLE :

/etc/periodic/weekly/310.locate panics with

panic: kmem_malloc(4096): kmem_map too small: 335544320 total
allocated

This box has nothing particular, apart from maybe a large number
of stamp-file based test-databases (with a lot of zero-sized
files named .key=value).
Producing this bug is easy :

- set tmpmfs="YES" and set tmpsize greater than around 220m
- start /etc/periodic/weekly/310.locate (and nothing else!)
- wait two-three hours and bang

Last test is with tmpfs=1024m and I monitored df -h /tmp and
vmstat -zm every minute; when the system panics, last output is :

Filesystem Size Used Avail Capacity Mounted on
/dev/md0 989M 219M 691M 24% /var/tmp

vmstat -zm | fgrep md0
md0: 512, 0, 453257, 15, 453437

I'm quite not an expert, but looks to me as if md0 use stays
almost 100% in kmem and is never swapped (as it is supposed to do
by default according to the man-page).

The rc script has different defaults than mdmfs:

fk@TP51 ~ $grep tmpmfs_flags /etc/defaults/rc.conf
tmpmfs_flags="-S -M" # Extra mdmfs options for the mfs /tmp

You probably want to ditch the "-M".

Fabian
--
http://www.fabiankeil.de/

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