Bug 2218877

Summary:	`dis -l` not working after executing `bt`
Product:	Red Hat Enterprise Linux 8	Reporter:	Íñigo Huguet <ihuguet>
Component:	crash	Assignee:	lijiang
Status:	CLOSED NOTABUG	QA Contact:	xiaoying yan <yiyan>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	8.9	CC:	dcaratti, jieli, jtornosm, lijiang, xiawu
Target Milestone:	rc	Keywords:	Triaged
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Hardware:	Unspecified
OS:	Unspecified
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Last Closed:	2023-07-24 09:26:17 UTC	Type:	Bug
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Embargoed:

Description Íñigo Huguet 2023-06-30 11:42:51 UTC

Trying to debug a panic in the driver brcmfmac, it is not possible to see the source code of the driver after executing bt.

crash version: 7.3.2-8.el8   gdb version: 7.6

Reproducer:
$ crash /usr/lib/debug/lib/modules/4.18.0-499.el8.x86_64/vmlinux /var/crash/127.0.0.1-2023-06-28-07\:25\:40/vmcore
crash> mod -s brcmfmac
crash> bt
crash> dis -l brcmf_fw_complete_request  <--- line numbers of original sources not shown

It works well if not excecuting `bt`:
$ crash /usr/lib/debug/lib/modules/4.18.0-499.el8.x86_64/vmlinux /var/crash/127.0.0.1-2023-06-28-07\:25\:40/vmcore
crash> mod -s brcmfmac
crash> dis -l brcmf_fw_complete_request  <--- it shows the line numbers of original sources

Once I execute `bt` once, it doesn't work anymore.

This bug seems to be fixed in more recent vesions of crash and/or gdb. If I inspect the same kernel dump from a RHEL 9 system with crash version: 8.0.3-1.el9 and gdb version: 10.2, the problem doesn't happen.