linux-kernel - Re: vmlinux-gdb unable to parse_and_eval("hrtimer

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Message-ID: <c9e9207c-1fe9-4cc2-95cd-6cefd8ff1c3a@siemens.com>
Date:   Thu, 19 Oct 2023 19:35:51 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     aftermath digital <aftermath.digital0@...il.com>,
        kbingham@...nel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:     stable@...r.kernel.org
Subject: Re: vmlinux-gdb unable to parse_and_eval("hrtimer_resolution") on
 mainline

On 18.10.23 21:57, aftermath digital wrote:
> Hi,
> 
> I've tested the below on both linux-6.5.7 and mainline linux-6.6-rc6,
> both of which seem to have the same issue.
> 
> GDB 13.2 isn't able to load vmlinux-gdb.py as it throws the following:
> 
> Traceback (most recent call last):
>   File "/home/user/debug_kernel/linux-6.6-rc6/vmlinux-gdb.py", line
> 25, in <module>
>     import linux.constants
>   File "/home/user/debug_kernel/linux-6.6-rc6/scripts/gdb/linux/constants.py",
> line 11, in <module>
>     LX_hrtimer_resolution = gdb.parse_and_eval("hrtimer_resolution")
> gdb.error: 'hrtimer_resolution' has unknown type; cast it to its declared type
> 
> I've built-linux like so:
> 
> make defconfig
> scripts/config --disable SYSTEM_TRUSTED_KEYS
> scripts/config --disable SYSTEM_REVOCATION_KEYS
> scripts/config --set-str SYSTEM_TRUSTED_KEYS ""
> scripts/config -e CONFIG_DEBUG_INFO -e CONFIG_GDB_SCRIPTS -e
> CONFIG_FRAME_POINTER

I happen to run into this myself recently while upgrading a .config:
CONFIG_DEBUG_INFO is now selected by DEBUG_INFO_DWARF*. I've then turned
on DEBUG_INFO_DWARF5, and things worked again.

> make -j$(nproc)
> make scripts_gdb
> 
> $ gcc --version
> gcc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0
> $ gdb --version
> GNU gdb (GDB) 13.2
> 
> This is my first time submitting a bug to the LK mailing list, please
> let me know if this format is not correct or if you need more
> information.
> 

Format is fine, just general linux-kernel@...r... reaches a broader
audience and is more appropriate for such a question.

Jan

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