This bug was fixed in the package linux - 3.18.0-11.12
---------------
linux (3.18.0-11.12) vivid; urgency=low
[ Leann Ogasawara ]
* Release Tracking Bug
- LP: #1414085
[ Andy Whitcroft ]
* SAUCE: arm64 -- psci tell the compiler which registers we are needing
values in
- LP: #1414002
-- Leann Ogasawara <leann.ogasaw...@canonical.com> Fri, 23 Jan 2015 09:10:09
-0800
** Changed in: linux (Ubuntu)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1413646
Title:
15.04: incomplete debug symbols package - please disable
CONFIG_DEBUG_INFO_SPLIT or package the .dwo files
Status in linux package in Ubuntu:
Fix Released
Bug description:
The kernel option CONFIG_DEBUG_INFO_SPLIT has been enabled in vivid
(commit bb5f2d940954fb389f16a0f7ad05b5a53a7e5227).
It moves debuginfo to .dwo files, using gcc -split-dwarf.
The kernel packaging received no updates to include the .dwo files, AFAICT.
This results in gdb/crash not unable to find/read the kernel debug
symbols, because the .dwo files are not present.
Possible solutions include:
1) Disable CONFIG_DEBUG_INFO_SPLIT
2) Update the packaging to include .dwo files.
Options #1 (patch attached) tested, and it worked.
Before:
----------
# grep CONFIG_DEBUG_INFO_SPLIT /boot/config-3.18.0-9-generic
CONFIG_DEBUG_INFO_SPLIT=y
gdb:
(gdb) symbol-file /usr/lib/debug/boot/vmlinux-3.18.0-9-generic
Reading symbols from /usr/lib/debug/boot/vmlinux-3.18.0-9-generic...
warning: Could not find DWO CU
arch/powerpc/kernel/.tmp_prom_init.dwo(0xa3396d7f33b2feee) referenced by CU at
offset 0x24c [in module /usr/lib/debug/boot/vmlinux-3.18.0-9-generic]
<and many other .dwo files>
crash:
gdb called without error_hook: Dwarf Error: CU at offset 0x24c
references unknown DWO with ID 51757104ad7ccc06 [in module
/usr/lib/debug/boot/vmlinux-3.18.0-8-generic]
Dwarf Error: CU at offset 0x24c references unknown DWO with ID
51757104ad7ccc06 [in module /usr/lib/debug/boot/vmlinux-3.18.0-8-generic]
crash: /usr/lib/debug/boot/vmlinux-3.18.0-8-generic: no
debugging data available
After:
--------
# grep CONFIG_DEBUG_INFO_SPLIT /boot/config-3.18.0-9-generic
# CONFIG_DEBUG_INFO_SPLIT is not set
gdb:
(gdb) symbol-file /usr/lib/debug/boot/vmlinux-3.18.0-9-generic
Reading symbols from
/usr/lib/debug/boot/vmlinux-3.18.0-9-generic...done.
crash:
# crash /usr/lib/debug/boot/vmlinux-3.18.0-9-generic
/var/crash/201501221026/dump.201501221026
<...>
KERNEL: /usr/lib/debug/boot/vmlinux-3.18.0-9-generic
DUMPFILE: /var/crash/201501221026/dump.201501221026 [PARTIAL DUMP]
<...>
crash>
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