crash: invalid structure member offset: kmem_cache_s_num FILE: memory.c LINE: 9619 FUNCTION: kmem_cache_init()

[NobinPegasus]

I'm learning linux kernel dev. Very new to it. I'm playing around with kernel panic.

my os version:

pegasus@pegasusv:~$ uname -a
Linux pegasusv 5.19.0-41-generic #42-Ubuntu SMP PREEMPT_DYNAMIC Mon Apr 17 19:17:03 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

I'm on QEMU/KVM.
Command I've run to cause the panic:

echo c > /proc/sysrq-trigger

Before running it I'd configured everything properly.
I'm following this link:
I'd also downloaded all the dbg-sym images of the same kernel.

https://ruffell.nz/programming/writ...g-kernel-crash-debugging-on-ubuntu-18-10.html

But when I'm rebooting using the same kernel, and running crash I'm getting the following error:

pegasus@pegasusv:/usr/lib/debug/boot$ crash vmlinux-5.19.0-41-generic /var/crash/202305100142/dump.202305100142 

crash 8.0.0
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please wait... (gathering kmem slab cache data)
crash: invalid structure member offset: kmem_cache_s_num
       FILE: memory.c  LINE: 9619  FUNCTION: kmem_cache_init()

[/usr/bin/crash] error trace: 56207d0cb69e => 56207d09f2f4 => 56207d16d11b => 56207d16d09c

How to resolve it?

 

[osprey]

I guess the next step could be to follow the message and inspect the source referenced:

crash: invalid structure member offset: kmem_cache_s_num
       FILE: memory.c  LINE: 9619  FUNCTION: kmem_cache_init()

Question also asked here: https://stackoverflow.com/questions...offset-kmem-cache-s-num-file-memory-c-line-96

 

[wizardfromoz]

Closing this thread. OP has moved on to another forum with the same question.

Chris Turner
wizardfromoz