Re: [Crash-utility] Crash-utility Digest, Vol 190, Issue 20

> > On 7/28/21, 11:14 AM, &quot;crash-utility-bounces(a)redhat.com on behalf of David Wysochanski" <crash-utility-bounces(a)redhat.com on behalf of dwysocha(a)redhat.com&gt; wrote: > > On Wed, Apr 28, 2021 at 8:54 AM lijiang <lijiang(a)redhat.com&gt; wrote: > > > > ? 2021?04?26? 19:17, crash-utility-request(a)redhat.com ??: > > > Message: 3 > > > Date: Mon, 26 Apr 2021 11:27:40 +0300 > > > From: Vasily Averin <vvs(a)virtuozzo.com&gt; > > > To: crash-utility(a)redhat.com > > > Subject: [Crash-utility] crash does not work with last fedora kernels? > > > Message-ID: <8f8782a9-3da6-5d3c-c509-8b8ec8a30957(a)virtuozzo.com&gt; > > > 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: https://src.fedoraproject.org/rpms/kernel/pull-request/48 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.