2.5.40 (BK of today) vmstat SIGSEGV after reading /proc/stat

2.5.40 (BK of today) vmstat SIGSEGV after reading /proc/stat

[Patrick Mau]

Hallo List,

The BK tree of today changed the data returned in /proc/stat.
A 'vmstat -n 10' immediatly segfaults after reading ...

open("/proc/stat", O_RDONLY)            = 6
read(6, "cpu  404408 506514 8240 154301 1"..., 4095) = 714
close(6)                                = 0
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++

I'll try to prove a diff between 2.4.18 and BK current later
this evening ...

cheers,
Patrick

Re: 2.5.40 (BK of today) vmstat SIGSEGV after reading /proc/stat

[Robert Love]

On Sat, 2002-10-05 at 13:12, Patrick Mau wrote:

> The BK tree of today changed the data returned in /proc/stat.
> A 'vmstat -n 10' immediatly segfaults after reading ...
> 
> open("/proc/stat", O_RDONLY)            = 6
> read(6, "cpu  404408 506514 8240 154301 1"..., 4095) = 714
> close(6)                                = 0
> --- SIGSEGV (Segmentation fault) ---
> +++ killed by SIGSEGV +++

The format changed, on purpose.  You need vmstat from a newer version of
procps.  The newest version (2.0.9) and CVS dumps as-of yesterday are
available at:

	http://tech9.net/rml/procps

as both tarballs and RPM packages.

	Robert Love

Re: 2.5.40 (BK of today) vmstat SIGSEGV after reading /proc/stat

[Dieter Nützel]

Am Samstag, 5. Oktober 2002 17:59 schrieb Robert Love:
> On Sat, 2002-10-05 at 13:12, Patrick Mau wrote:
>
> > The BK tree of today changed the data returned in /proc/stat.
> > A 'vmstat -n 10' immediatly segfaults after reading ...
> >
> > open("/proc/stat", O_RDONLY)            = 6
> > read(6, "cpu  404408 506514 8240 154301 1"..., 4095) = 714
> > close(6)                                = 0
> > --- SIGSEGV (Segmentation fault) ---
> > +++ killed by SIGSEGV +++
>
> The format changed, on purpose.  You need vmstat from a newer version of
> procps.  The newest version (2.0.9) and CVS dumps as-of yesterday are
> available at:
>
>        http://tech9.net/rml/procps
>
> as both tarballs and RPM packages.

2.5.40/2.5.40-mcp1 gave me same.
"top" showed only one CPU.

Solution:

Get 2.5.40-ac3. Alan "fixed" that.

-- 
Dieter Nützel
Graduate Student, Computer Science

University of Hamburg
Department of Computer Science
@home: Dieter.Nuetzel at hamburg.de (replace at with @)

Re: 2.5.40 (BK of today) vmstat SIGSEGV after reading /proc/stat

[Robert Love]

On Sat, 2002-10-05 at 14:41, Dieter Nützel wrote:

> 2.5.40/2.5.40-mcp1 gave me same.
> "top" showed only one CPU.
> 
> Solution:
> 
> Get 2.5.40-ac3. Alan "fixed" that.

I think (and I could be wrong, I have been once or twice before) that
what you are describing is separate from the issue I am talking about
and Patrick Mau reported.

In the current BK (not 2.5.40) I believe Linus merged a patch from
Andrew that changed /proc/stat syntax.  This will break old vmstat
binaries.  You need to upgrade to the above version, at least.

	Robert Love