sh (pid 1081) segfaults for page address 00000000 at pc 00000000

[Cristian Ionescu-Idbohrn]

On Sun, 25 Jan 2009, walter harms wrote:

> Cristian Ionescu-Idbohrn schrieb:
> > On Sun, 25 Jan 2009, walter harms wrote:
> >
> >> does
> >> if [ -z "$(pidof <process name>)" ]; then
> >>
> >> change anything ?
> >
> > I'll try that tomorrow at work.
> >
> > Thinking about it a little more...
> > It is the _shell_ that runs pidof that is actually segfaulting.
> > May very well be a compiler bug, but I'm not looking in that direction
> > right now.
> >
> > The SIGSEVG signal handler I'm playing with is in ash.c.
> > The idea is to put ash in a while(1); loop and gdb attach to the process.
> >
> > I would appreciate any advice/ideas on how to catch this bug.
> >
>
> i think it would be interessting to make sure that pidof is needed to
> cause the bug.
> yes: no clue
> no : the subshell is the most likely candidate but i doubt it, since it
>      is used to heavly and the bug should have surfaced in other
>       applications
>
> do older versions of ash behave the same ? (e.g. 1.12 ?)

This is the first time I noticed that.  The "older" version is really old
1.1.3 and does not expose the problem.

> maybe "test" is broken ? (note: build-in yes/no )

That's an interesting point.  I'll look into it.
Yes, builtin ATM.  I'll check with a non-builtin "test".


Cheers,

-- 
Cristian