[Crash-utility] [Fwd: Some notes in descovering your crash]

[Dave Anderson]

> Helo, i have reviewed which is really fascinating.
>
>
> The architecture i use :
> crash> sys
>       KERNEL: /boot/vmlinux-2.6.15.2
>     DUMPFILE: /dev/mem
>         CPUS: 1
>         DATE: Wed Mar 29 12:05:05 2006
>       UPTIME: 04:33:58
> LOAD AVERAGE: 0.05, 0.06, 0.02
>        TASKS: 67
>     NODENAME: portable.domain.com
>      RELEASE: 2.6.15.2
>      VERSION: #4 PREEMPT Tue Mar 21 14:34:11 CET 2006
>      MACHINE: i686  (748 Mhz)
>       MEMORY: 511.9 MB
>
> A question : i could not find how to have a module withou [CONFIG_KALLSYMS] when
> i do mod
>

I'm not sure I understand the question?

> Some problems
>
> 1)kmem -s and kmem -S
>
> crash> kmem -s
>
> kmem: invalid structure member offset: kmem_cache_s_lists
>       FILE: memory.c  LINE: 7671  FUNCTION: do_slab_chain_percpu_v2()
>
> [./crash] error trace: 8099315 => 80a4d09 => 80a635d => 810cab0
> CACHE    NAME                 OBJSIZE  ALLOCATED     TOTAL  SLABS  SSIZE
>
>   810cab0: OFFSET_verify+81
>   80a635d: do_slab_chain_percpu_v2+103
>   80a4d09: dump_kmem_cache_percpu_v2+1615
>   8099315: cmd_kmem+3392
>
> kmem: invalid structure member offset: kmem_cache_s_lists
>       FILE: memory.c  LINE: 7671  FUNCTION: do_slab_chain_percpu_v2()
>
>
> 2) crash> kmem -i
>               PAGES        TOTAL      PERCENTAGE
>  TOTAL MEM   128778       503 MB         ----
>       FREE    44244     172.8 MB   34% of TOTAL MEM
>       USED    84534     330.2 MB   65% of TOTAL MEM
>     SHARED    45690     178.5 MB   35% of TOTAL MEM
>    BUFFERS     4371      17.1 MB    3% of TOTAL MEM
>     CACHED    51358     200.6 MB   39% of TOTAL MEM
>       SLAB        0            0    0% of TOTAL MEM
>
> TOTAL HIGH        0            0    0% of TOTAL MEM
>
> The command stops and SLAB is certainly not correct
>

See the prior messages on March 28th from Sharyathi Nagesh
in the mailing list; he is currently working on this.

>
> 3) net -s and net -S
> crash> net -s
>
> net: invalid structure member offset: files_struct_max_fdset
>      FILE: net.c  LINE: 1117  FUNCTION: dump_sockets_workhorse()
>
> [./crash] error trace: 80dca66 => 80ded3a => 80def30 => 810cab0
> PID: 5489   TASK: d7b97000  CPU: 0   COMMAND: "crash"
>
>   810cab0: OFFSET_verify+81
>   80def30: dump_sockets_workhorse+164
>   80ded3a: dump_sockets+80
>   80dca66: cmd_net+418
>
> net: invalid structure member offset: files_struct_max_fdset
>      FILE: net.c  LINE: 1117  FUNCTION: dump_sockets_workhorse()
>

Interesting.  This will require the same type of changes that
are in open_files_dump() in filesys.c (lines 2129 - 2156), which
calculate the local max_fdset and max_fds variables.


>
> 4)
> The problems withe those commands are normal i think, the structures are not
> supported in kernel 2.6?
>
> kmem -la, -La, -li, -Li do not find active_list and inactive_list
> irq -b
> net -a
>

Correct.  Either the structures are not supported in 2.6, or
continued support of the option has been deprecated.

Thanks for the report -- and please join the list!

Dave Anderson

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