[Crash-utility] Crash for SLES 10 hangs.

Alok Kataria akataria at vmware.com
Wed Jul 1 01:38:44 UTC 2009


Hi,

I am trying to debug a bug on SLES 10 kernel using crash.
I have the vmlinux and the vmlinux.debug file for the corresponding
kernel but when I try to start crash it hangs while loading the "slab
cache" data.  
****
crash 4.0-7.2.3.el5_3.1
....
.... 
GNU gdb 6.1
....
This GDB was configured as "x86_64-unknown-linux-gnu"...

please wait... (gathering kmem slab cache data)  
****

I then ran crash with "-d 99" debugging support.
Looking at the debug data generated from crash, below is the text which
is repeatedly printed by crash.

------
crash: invalid kernel virtual address: 47  type: "kmem_list3 shared"
<readmem: ffff81000f6266c8, KVADDR, "kmem_list3 shared", 8, (ROE|Q), 7fff89fb1f00>
<readmem: f88948c3c0310006, KVADDR, "shared array_cache limit", 4, (ROE|Q), 7fff89fb1f0c>

crash: invalid kernel virtual address: f88948c3c0310006  type: "shared array_cache limit"
  FREEBUF(1)
<readmem: ffff81000f5ab1a0, KVADDR, "kmem_cache_s buffer", 1648, (ROE), a5a480>
<readmem: ffff81000f5ab1a0, KVADDR, "array cache array", 1024, (ROE), 7fff89fb1f10>
  GETBUF(512 -> 1)
<readmem: ffff81000f5ab5b0, KVADDR, "array nodelist array", 512, (ROE), a57c80>
<readmem: 47, KVADDR, "kmem_list3 shared", 8, (ROE|Q), 7fff89fb1f00>

crash: invalid kernel virtual address: 47  type: "kmem_list3 shared"
<readmem: 47, KVADDR, "kmem_list3 shared", 8, (ROE|Q), 7fff89fb1f00>
------

Is there a way to tell crash to skip loading slab data ? Or is this a
known bug with crash on sles 10 ?

Please let me know what might be going wrong here.

Thanks,
Alok




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