Re: VM problem with 2.4.8-ac9 (fwd)

[Marcelo Tosatti <marcelo@conectiva.com.br>]

On Wed, 22 Aug 2001, Rik van Riel wrote:

> Hi Alan,
> 
> Another report of tasks dying on recent 2.4 kernels.
> Suspect code would be:
> - tlb optimisations in recent -ac    (tasks dying with segfault)
> - swapfile.c, especially sys_swapoff (known race condition, marcelo?)

There are known races on swapoff, but Jari is not running swapoff...

> 
> What would cause the swap map badness below I wouldn't know,
> maybe marcelo is more familiar with the swapfile.c code...

Jari, 

1) Are you using an SMP kernel? 
2) Did you tried with older kernels or 2.4.9?


> 
> Rik
> --
> IA64: a worthy successor to the i860.
> ---------- Forwarded message ----------
> Date: Wed, 22 Aug 2001 20:37:01 +0300
> From: Jari Ruusu <jari.ruusu@pp.inet.fi>
> To: Rik van Riel <riel@conectiva.com.br>
> Subject: VM problem with 2.4.8-ac9
> 
> Unused swap offset entry in swap_dup 00519e00
> VM: Bad swap entry 00519e00
> Unused swap offset entry in swap_count 00519e00
> Unused swap offset entry in swap_count 00519e00
> VM: Bad swap entry 00519e00
> Unused swap offset entry in swap_dup 006b8a00
> VM: Bad swap entry 006b8a00
> Unused swap offset entry in swap_dup 006b8a00
> VM: killing process nscd
> Unused swap offset entry in swap_dup 006b8a00
> VM: killing process nscd
> VM: Bad swap entry 006b8a00
> Unused swap offset entry in swap_dup 005e6900
> VM: Bad swap entry 005e6900
> Unused swap offset entry in swap_dup 005e6900
> VM: killing process init
> Unused swap offset entry in swap_dup 005e6900
> VM: killing process init
> Unused swap offset entry in swap_dup 005e6900
> VM: killing process init
> Unused swap offset entry in swap_dup 005e6900
> VM: killing process init
> Kernel panic: Attempted to kill init!
> 
> Linux debian 2.4.8-ac9 #1 Wed Aug 22 16:04:25 EEST 2001 i686 unknown
> Gnu C                  2.95.3
> Gnu make               3.79.1
> binutils               2.9.5.0.37
> mount                  2.11g
> modutils               2.4.6
> e2fsprogs              1.18
> PPP                    2.3.11
> Linux C Library        2.1.3
> ldd: version 1.9.11
> Procps                 2.0.6
> Net-tools              1.54
> Console-tools          0.2.3
> Sh-utils               2.0
> 
> I get a repeatable VM failure with recent 2.4 kernels, tested with
> 2.4.8-ac[789] on x86 architecture. My VM torture test consists of following:
> boot the kernel with "mem=16M" parameter, start X11 and a couple xterms
> running kernel compile, glibc compile, bzip2 decompressor + tar, and top.
> Also xosview was running. Working memory need of such setup is way over
> available RAM, and swap use was about 20-35 MB (of 190 MB available swap),
> and swapping activity was _continuous_. Kernel 2.2.19aa2 survives the
> torture (everything else being same), and memtest-86 does not find any
> errors, so it is unlikely to be hardware failure.
> 
> Anyway, the box dies after about 1-3 hours of torture. Sometimes it just
> kills some random process. I captured above info using serial console. If
> you need more info (.config, System.map, whatever) just ask for it. I am
> willing to do more testing, just tell me what you need done.
> 
> Regards,
> Jari Ruusu <jari.ruusu@pp.inet.fi>
> 

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