Re: Running out of Unix98 PTYs in 2.2.13pre14

Warwick Mitchell (wmitchell@glug.org.au)
Thu, 14 Oct 1999 10:16:14 +1000 (EST)

I'm also running Debian potato but am not seeing the same problems. I'm
primarly in X though, using Eterms. When I close one, and reopen a new one
I get the old PTY.

Warwick

On Wed, 13 Oct 1999, Stephen Frost wrote:

>
> I have noticed this exact problem as well, luckily I'm
> only up to 81 on my router so far. :)
>
> Stephen
>
> On 14 Oct 1999, Jarno Paananen wrote:
>
> > Hi,
> >
> > the problem is that the Unix98 PTY numbers don't seem to get
> > reused. With a maximum of 256 configured in the kernel it
> > takes 1-2 weeks to run out of PTYs.
> >
> > At the moment the situation is like this (the machine had to be
> > booted yesterday because of this and now it seems we have to do
> > it again before end of the week):
> >
> > crw------- 1 chery tty 136, 0 Oct 13 21:34 0
> > crw--w---- 1 pekangas tty 136, 1 Oct 13 23:59 1
> > crw------- 1 jpaana tty 136, 104 Oct 14 00:00 104
> > crwx------ 1 jpaana tty 136, 108 Oct 14 00:00 108
> > crw------- 1 jpaana tty 136, 3 Oct 13 23:59 3
> > crw------- 1 jpaana tty 136, 4 Oct 14 00:00 4
> > crw------- 1 chery tty 136, 43 Oct 13 23:59 43
> > crw------- 1 chery tty 136, 44 Oct 13 21:34 44
> > crw------- 1 jpaana tty 136, 5 Oct 13 23:59 5
> > crw------- 1 jpaana tty 136, 6 Oct 14 00:00 6
> > crw------- 1 jpaana tty 136, 75 Oct 14 00:00 75
> > crw------- 1 jpaana tty 136, 95 Oct 13 23:53 95
> >
> > And this is all in /dev/pts. Lsof doesn't reveal any extra open
> > PTYs. After number 255 is opened all programs complain about not
> > getting a PTY.
> >
> > The kernel version is 2.2.13pre14 compiled with gcc 2.7.2.3. The
> > same symptom appeared in 2.2.12, but possibly not in 2.2.10 (at
> > least that kernel got an uptime of 62 days).
> >
> > Could this be a userland problem with something taking up PTYs,
> > a glibc bug (using 2.1.2 from Debian Potato), or a genuine
> > kernel problem?
> >
> > Any help is very welcome...
> >
> > // Jarno
> >
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>
>
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