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Bug 538532 - /etc/init.d/mdev script sometimes sets /dev and /dev/shm to 10 megabytes max
Summary: /etc/init.d/mdev script sometimes sets /dev and /dev/shm to 10 megabytes max
Status: RESOLVED NEEDINFO
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: [OLD] Unspecified (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Linux bug wranglers
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Reported: 2015-02-02 13:55 UTC by Walter Dnes
Modified: 2015-02-06 10:20 UTC (History)
0 users

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Description Walter Dnes 2015-02-02 13:55:27 UTC 
In response to Bug #92921, script /etc/init.d/mdev function mount_it() contains the line...

mount -n -t tmpfs -o "exec,nosuid,mode=0755,size=10M" mdev /dev

Since /dev/shm is mounted on /dev, that restricts /dev/shm to 10 megabytes whenever this line is invoked. 10 megabytes is insufficient for today's programs. This is in 1.23.0-r1, but I suspect also in all versions.

Reproducible: Sometimes

Steps to Reproduce:
1. reboot
2. try to copy an 11 megabyte file to /dev/shm
3.
Actual Results:  
Fails due to insufficient space

Expected Results:  
Copy should work

As a temporary workaround, I've changed the line in question to

mount -n -t tmpfs -o "exec,nosuid,mode=0755,size=50%" mdev /dev

i.e. allow up to 50% of ram for /dev/shm, which is the usual default. Does this consume more ram than "mount -n /dev" when /dev/shm is empty?
Comment 1 Jeroen Roovers (RETIRED) gentoo-dev 2015-02-02 14:31:15 UTC 
1) Please post your `emerge -vpq /etc/init.d/mdev' output in a comment.
2) Please post your `emerge --info' output in a comment.