On 7/28/21, 11:14 AM, "crash-utility-bounces@xxxxxxxxxx on behalf of David Wysochanski" <crash-utility-bounces@xxxxxxxxxx on behalf of dwysocha@xxxxxxxxxx> wrote:
On Wed, Apr 28, 2021 at 8:54 AM lijiang <lijiang@xxxxxxxxxx> wrote:
>
> ? 2021?04?26? 19:17, crash-utility-request@xxxxxxxxxx ??:
> > Message: 3
> > Date: Mon, 26 Apr 2021 11:27:40 +0300
> > From: Vasily Averin <vvs@xxxxxxxxxxxxx>
> > To: crash-utility@xxxxxxxxxx
> > Subject: crash does not work with last fedora kernels?
> > Message-ID: <8f8782a9-3da6-5d3c-c509-8b8ec8a30957@xxxxxxxxxxxxx>
> > Content-Type: text/plain; charset=utf-8
> >
> > It looks like Fedora kernels uses gcc11 and generates debuginfo in DWARF 5 format.
> >
> > [root@localhost ~]# rpm -q crash
> > crash-7.2.9-5.fc35.x86_64
> > [root@localhost ~]# uname -a
> > Linux localhost.localdomain 5.11.12-300.fc34.x86_64 #1 SMP Wed Apr 7 16:31:13 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
> >
> >
> > [root@localhost ~]# crash -1
> > Dwarf Error: wrong version in compilation unit header (is 5, should be 2, 3, or 4) [in module /usr/lib/debug/usr/lib/modules/5.11.12-300.fc34.x86_64/vmlinux]
> > crash: gdb_session_init: pulling in debug data by accessing init_mm.mmap
> > Dwarf Error: wrong version in compilation unit header (is 5, should be 2, 3, or 4) [in module /usr/lib/debug/usr/lib/modules/5.11.12-300.fc34.x86_64/vmlinux]
> >
> > crash: /usr/lib/debug/lib/modules/5.11.12-300.fc34.x86_64/vmlinux: no debugging data available
> >
> > [root@localhost ~]# ls -al /usr/lib/debug/lib/modules/5.11.12-300.fc34.x86_64/vmlinux
> > -rwxr-xr-x. 1 root root 679679112 Apr 7 20:14 /usr/lib/debug/lib/modules/5.11.12-300.fc34.x86_64/vmlinux
> > [root@localhost ~]# rpm -qf /usr/lib/debug/lib/modules/5.11.12-300.fc34.x86_64/vmlinux
> > kernel-debuginfo-5.11.12-300.fc34.x86_64
> >
> > NB: last fc35 does not work too.
> >
>
> Thank you for reporting this issue, Vasily.
>
> The DWARF-5 caused this failure. I will have a look and try to handle this issue later.
>
> Thanks.
> Lianbo
>
What's the status of this issue? Is this due to needing updated
embedded gdb or something else?
Hi, David
Thank you for the attention.
Currently, Fedora kernel has been forced to generate the DWARF4 debuginfo via the
CONFIG_DEBUG_INFO_DWARF4 kernel option, see jforbes' comment:Once crash gdb is upgraded, the DWARF5 could be enabled again in Fedora kernel.
BTW: that is a temporary branch, still under tests and it has not been announced yet.
Thanks.
Lianbo
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