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a=zPCbziy225d3KhSqZt3L1A==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=wP3pNCr1ah4A:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=NEAV23lmAAAA:8 a=p0WdMEafAAAA:8 a=20KFwNOVAAAA:8 a=yPCof4ZbAAAA:8 a=u9SqAmalycr8LLFts7wA:9 cc=ntf awl=host:12098 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMjA1MDEzOCBTYWx0ZWRfX/WIdTBT04+RI 93JOe0DRre4e5zbpV90uWE0e7NWRqEoXaHIn4y6xxSa/rjv9jH/AXsDhXfcggYI7BKv8Wn7fceH ra0YIPfLfeBxD70CbVkvA2Zt7UziBDdGLLnw3+6uZqWyY0NXIgznYbtml8ovBzR7UasTRD/np0r 1qCzdCTiuc2Mbk6W2UCIpT+OCbGUjSly6ehS3ZsBhqNGNXfOXjXZbTZwiudf+xohiBBMUt/s77p 7d3I/eQTdmZyIN5Xzx8LZugXode+Xo0lccvhWfXIEn4jFVe6mW12/6uNOHz4OGLAwnS93WshWdO CCGsgPlxexrpNj48HoxGnC2My9TJMY0wcVtjecwhXNo8iEUt4S9FbGkt91VxY1h4/jTa8X89Inw iN10Apjn/7hTJ/wUQWUbJy/KpXUMeoFw5QCO6WhiDGK90ie2KeA= Philipp Rudo writes: > Hi Stephen, > > thanks for letting me know. And yes that is something we need to fix in > the kernel rather than drgn. > > I took a quick look and found that the change was included when > backporting fb799447ae29 ("x86,objtool: Split UNWIND_HINT_EMPTY in two") > for 9.6. Thing is that I'll be heading to LPC tomorrow and won't have > time to work on it properly before that... Thanks for taking a deeper look! No worries on timing, it's not urgent. If you think the most likely fix will be to backport commit b9f174c811e3a ("x86/unwind/orc: Add ELF section with ORC version identifier"), then I believe the drgn workaround I proposed in the Github issue [1] should work fine: once the .orc_header section is found, drgn will detect it and use the correct hash. The only difference being that the "true" first broken version was 5.14.0-517.el9, which might be worth encoding in the code in case somebody ever runs drgn against a weird unreleased version from that development period. [1]: https://github.com/osandov/drgn/issues/578#issuecomment-3614826789 > One more hint. When you want to get the history of RHEL, it's better to > check the centos-stream repo then the changelog. There you have the > full git history (modulo some embargoed CVE fixes). > > https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9 Thanks, that helps a lot! Stephen > Thanks > Philipp > > > On Thu, 04 Dec 2025 12:06:54 -0800 > Stephen Brennan wrote: > >> 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 >>