I have been regularly getting kernel panics on my machine.
I've set up swap and configured the machine to save the crash dumps.
I've tried using kgdb and the output follows:
So I see two issue here:
How do I get the debug symbols?
I've set up swap and configured the machine to save the crash dumps.
Code:
root@mymachine:/var/crash # ls -la
total 6035439
drwxr-x--- 2 root wheel 21 Jul 22 08:55 .
drwxr-xr-x 25 root wheel 25 Jul 22 09:07 ..
-rw-r--r-- 1 root wheel 2 Jul 22 08:54 bounds
-rw-r--r-- 1 root wheel 169 Jul 22 02:21 core.txt.0
-rw-r--r-- 1 root wheel 169 Jul 22 03:15 core.txt.1
-rw-r--r-- 1 root wheel 169 Jul 22 07:29 core.txt.2
-rw-r--r-- 1 root wheel 169 Jul 22 07:56 core.txt.3
-rw-r--r-- 1 root wheel 169 Jul 22 08:55 core.txt.4
-rw------- 1 root wheel 371 Jul 22 02:20 info.0
-rw------- 1 root wheel 370 Jul 22 03:13 info.1
-rw------- 1 root wheel 371 Jul 22 07:28 info.2
-rw------- 1 root wheel 370 Jul 22 07:55 info.3
-rw------- 1 root wheel 371 Jul 22 08:54 info.4
lrwxr-xr-x 1 root wheel 6 Jul 22 08:55 info.last -> info.4
-rw-r--r-- 1 root wheel 5 May 12 09:27 minfree
-rw------- 1 root wheel 4540502016 Jul 22 02:21 vmcore.0
-rw------- 1 root wheel 4627173376 Jul 22 03:14 vmcore.1
-rw------- 1 root wheel 4592214016 Jul 22 07:29 vmcore.2
-rw------- 1 root wheel 4530495488 Jul 22 07:56 vmcore.3
-rw------- 1 root wheel 4536147968 Jul 22 08:55 vmcore.4
lrwxr-xr-x 1 root wheel 8 Jul 22 08:55 vmcore.last -> vmcore.4
root@mymachine:/var/crash # cat core.txt.4
'version' has unknown type; cast it to its declared type
'version' has unknown type; cast it to its declared type
Unable to find matching kernel for /var/crash/vmcore.4
root@mymachine:/var/crash # cat info.last
Dump header from device: /dev/da0p2
Architecture: amd64
Architecture Version: 2
Dump Length: 4536147968
Blocksize: 512
Compression: none
Dumptime: 2022-07-22 08:31:09 +0100
Hostname: nsgnalpsroot
Magic: FreeBSD Kernel Dump
Version String: FreeBSD 13.1-RELEASE GENERIC
Panic String: page fault
Dump Parity: 1801250075
Bounds: 4
Dump Status: goodI've tried using kgdb and the output follows:
Code:
root@mymachine:/var/crash # kgdb -n last
kgdb: couldn't find a suitable kernel image
root@mymachine:/var/crash # kgdb /boot/kernel/kernel /var/crash/vmcore.last
GNU gdb (GDB) 11.2 [GDB v11.2 for FreeBSD]
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
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Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
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Reading symbols from /boot/kernel/kernel...
(No debugging symbols found in /boot/kernel/kernel)
/usr/ports/devel/gdb/work-py38/gdb-11.2/gdb/thread.c:1345: internal-error: void switch_to_thread(thread_info *): Assertion `thr != NULL' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) n
This is a bug, please report it. For instructions, see:
<https://www.gnu.org/software/gdb/bugs/>.
/usr/ports/devel/gdb/work-py38/gdb-11.2/gdb/thread.c:1345: internal-error: void switch_to_thread(thread_info *): Assertion `thr != NULL' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n) n
Command aborted.
(kgdb)So I see two issue here:
- No debugging symbols found in /boot/kernel/kernel
- /usr/ports/devel/gdb/work-py38/gdb-11.2/gdb/thread.c:1345: internal-error: void switch_to_thread(thread_info *): Assertion `thr != NULL' failed.
How do I get the debug symbols?
