* Not able to decode local/ stack variables in vmcore
[not found] <CALkUMdTyaY2P-eh7JMb6KPgyPa8oZKrb4XJcgaWOpnUn2s6GaQ@mail.gmail.com>
@ 2021-12-14 10:22 ` Vimal Agrawal
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From: Vimal Agrawal @ 2021-12-14 10:22 UTC (permalink / raw)
To: gdb; +Cc: Vimal Agrawal
I don't see any option to see local variables in vmcore using crash
utility. Tried gdb as well. Gdb is not able to dump stack.
(gdb) bt
#0 sysrq_handle_crash (key=99) at drivers/tty/sysrq.c:147
Backtrace stopped: Cannot access memory at address 0xffffb8c6c132fe40
(gdb) x 0xffffb8c6c132fe40
0xffffb8c6c132fe40: Cannot access memory at address 0xffffb8c6c132fe40
(gdb) info reg rsp
rsp 0xffffb8c6c132fe38 0xffffb8c6c132fe38
(gdb)
I have loaded symbols on specific .text, .data and .bss load addresses
using following commands:
> gdb -c kcrash_vmcore
gdb> add-symbol-file ~/crash3/vmlinux 0xffffffff97000000 -s .data
0xffffffff97c00000 -s .bss 0xffffffff97fa5000
I could decode .text and global .data symbols but not stack addresses
and local variables.
I have tried enabling CONFIG_FRAME_POINTER and also tried the latest
version of gdb and crash as well but no help.
Can someone please suggest and comment if this is indeed possible with
gdb/crash to decode local variables from vmcore?
Vimal Agrawal
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2021-12-14 10:22 ` Not able to decode local/ stack variables in vmcore Vimal Agrawal
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