Public bug reported:
Binary package hint: apt
Frequently when doing an apt-get dist-upgrade on gutsy, apt-get just hangs.
When it does this, it's stuck in a read() call on /dev/ptmx.
lsof of a hung apt-get shows a lot of open FD, all with /dev/ptmx open:
apt-get 5694 root 28u CHR 5,2 4240 /dev/ptmx
apt-get 5694 root 29u CHR 5,2 4240 /dev/ptmx
apt-get 5694 root 30u CHR 5,2 4240 /dev/ptmx
apt-get 5694 root 31u CHR 5,2 4240 /dev/ptmx
apt-get 5694 root 32u CHR 5,2 4240 /dev/ptmx
apt-get 5694 root 33u CHR 5,2 4240 /dev/ptmx
apt-get 5694 root 34u CHR 5,2 4240 /dev/ptmx
apt-get 5694 root 35u CHR 5,2 4240 /dev/ptmx
apt-get 5694 root 36u CHR 5,2 4240 /dev/ptmx
apt-get 5694 root 37u CHR 5,2 4240 /dev/ptmx
apt-get 5694 root 38u CHR 5,2 4240 /dev/ptmx
apt-get 5694 root 39u CHR 5,2 4240 /dev/ptmx
apt-get 5694 root 40u CHR 5,2 4240 /dev/ptmx
If I kill -9 it and re-run, it completes successfully. If I leave it
alone, sometimes it will come back (after up to half an hour!), other
times it just hangs forever.
** Affects: apt (Ubuntu)
Importance: Undecided
Status: New
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apt-get blocks on /dev/ptmx a lot
https://bugs.launchpad.net/bugs/148806
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