linux-kernel - Re: crash/gdb: DW_FORM_strp pointing outside of .debug

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Date:	Wed, 19 Nov 2014 09:24:28 -0500 (EST)
From:	Dave Anderson <anderson@...hat.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: crash/gdb: DW_FORM_strp pointing outside of .debug_str section


> Hi,
>     I have been trying to debug a multi controller hang issue with crash.
> 
> It seems that crash works fine on stock ubuntu 14.04 running
> 3.13.0-39-generic. However when I recompile kernel and try to run
> crash on it I get the following error:
> 
> crash> mod -s nvme ./nvme.ko
>      MODULE       NAME                    SIZE  OBJECT FILE
> ffffffffa01d1240  nvme                   58727  ./nvme.ko
> crash> add-symbol-file ./nvme.ko 0xffffffffa01d1240
> add symbol table from file "./nvme.ko" at
>         .text_addr = 0xffffffffa01d1240
> Reading symbols from /root/mynvme.sriov/nvme.ko...DW_FORM_strp
> pointing outside of .debug_str section [in module
> /root/mynvme.sriov/nvme.ko]
> gdb: gdb request failed: add-symbol-file ./nvme.ko 0xffffffffa01d1240
> crash>
> Any input on what I might have done wrong? Do I need to rebuild the
> crash utility package along with the kernel?
> 
> Thanks,
> Kallol
 
This is the wrong mailing list for crash utility issues.  Please send
your queries to crash-utility@...hat.com.

That being said, the "mod -s" command does the add-symbol-file command
behind the scenes.  Your discrete "add-symbol-file" command is both
unnecessary and incorrect -- 0xffffffffa01d1240 is the address
of the nvme module's module data structure and not the starting
text address.

Dave Anderson
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