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From: Stephen Brennan <stephen.s.brennan@oracle.com>
To: Philipp Rudo <prudo@redhat.com>
Cc: Omar Sandoval <osandov@osandov.com>, <linux-debuggers@vger.kernel.org>
Subject: Unknown ORC entry type 5 on RHEL 9 kernel
Date: Thu, 04 Dec 2025 12:06:54 -0800	[thread overview]
Message-ID: <87h5u6j9k1.fsf@oracle.com> (raw)

Hi Philipp,

I wanted to let you know about an issue with drgn's stack unwinding on
the RHEL 9 kernel. It looks like that kernel backports some ORC changes,
without including a change Omar made (including an .orc_header section)
to help identify the ORC format version. I've included more details on
this drgn issue:

https://github.com/osandov/drgn/issues/578

The result is that drgn can't unwind stacks on the RHEL 9 kernel. I
think the best path forward would be to include the .orc_header patch:
b9f174c811e3a ("x86/unwind/orc: Add ELF section with ORC version identifier")

As it is, the RHEL 9 drgn can't unwind stacks on the RHEL 9 kernel,
which seems less than ideal.

Thanks,
Stephen

             reply	other threads:[~2025-12-04 20:07 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-12-04 20:06 Stephen Brennan [this message]
2025-12-05 10:41 ` Unknown ORC entry type 5 on RHEL 9 kernel Philipp Rudo
2025-12-05 18:38   ` Stephen Brennan
2025-12-17 16:11     ` Philipp Rudo

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