[Crash-utility] vmss.core and kernel dbgsym do not match!

[Eric Desrochers]

Hi,

In reference to bug : https://bugzilla.redhat.com/show_bug.cgi?id=233151

I have the same problem trying to analyze a vmss.core file with kernel v4.4.0-36-generic (Ubuntu) :

crash: /usr/lib/debug/boot/*vmlinux-4.4.0-36-generic* and /var/vmss_m.core do not match!

I also tried with the following (as recommended in the bug threads) without success :
--machdep phys_base=0x200000

I'm using the right -dbgsym for the right kernel as confirmed here :

$ strings vmss_m.core | grep "Linux version"
Linux version *4.4.0-36-generic* (buildd at lgw01-20) (gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) ) #55~14.04.1-Ubuntu SMP Fri Aug 12 11:49:30 UTC 2016 (Ubuntu 4.4.0-36.55~14.04.1-generic 4.4.16)

$ readelf -a vmss_m.core

Program Headers:
  Type           Offset             VirtAddr           PhysAddr
                 FileSiz            MemSiz              Flags  Align
  NOTE           0x00000000000000e8 0x0000000000000000 0x0000000000000000
                 0x0000000000000218 0x0000000000000000         0
  LOAD           0x0000000080001000 0x00000000fff80000 0x00000000fff80000
                 0x0000000000080000 0x0000000000080000  RWE    1000
  LOAD           0x0000000000001000 0x0000000000000000 0x0000000000000000
                 0x0000000080000000 0x0000000080000000  RWE    1000

The VirtAddr and PhysAddr are just zero.

I tried with the latest and greatest crash-utility from [https://github.com/crash-utility/crash.git] using version 7.1.5++ but this has no effect, I still have the error :

crash: /usr/lib/debug/boot/*vmlinux-4.4.0-36-generic* and /var/vmss_m.core do not match!

Any ideas ?

- Eric

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