toolchain/54589: gdb is not working for core files on evbarm

[martin%NetBSD.org@localhost]

>Number:         54589
>Category:       toolchain
>Synopsis:       gdb is not working for core files on evbarm
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Oct 01 12:35:00 +0000 2019
>Originator:     Martin Husemann
>Release:        NetBSD 9.99.15
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD unpluged.duskware.de 9.99.15 NetBSD 9.99.15 (UNPLUGED) #265: Tue Oct 1 13:38:00 CEST 2019 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/evbarm/compile/UNPLUGED evbarm
Architecture: earm
Machine: evbarm
>Description:

Trying to debug a core dump on evbarm fails:

# gdb named named.core 
GNU gdb (GDB) 8.3
Copyright (C) 2019 Free Software Foundation, Inc.
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.
This GDB was configured as "armv7--netbsdelf-eabihf".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
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Reading symbols from named...
Reading symbols from /usr/libdata/debug//usr/sbin/named.debug...
[New process 1]
[New process 4]
[New process 3]
[New process 2]
Core was generated by `named'.
Program terminated with signal SIGBUS, Bus error.
#0  0xbbba0e84 in ?? ()
[Current thread is 1 (process 1)]
(gdb) bt
#0  0xbbba0e84 in ?? ()
#1  0xbbba0ad4 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb) x/16i $pc
=> 0xbbba0e84:  Register 25 is not available
(gdb) info reg
r0             0xbbbc71f4          3149689332
r1             0xbfffd950          3221215568
r2             0x1                 1
r3             0xbfffd948          3221215560
r4             0xbb2579f8          3139795448
r5             0xbfffd950          3221215568
r6             0x1                 1
r7             0x0                 0
r8             0xbb255a28          3139787304
r9             0xbb260a10          3139832336
r10            0xbbbca000          3149701120
r11            0xbfffdd6c          3221216620
r12            0xbbba0e80          3149532800
sp             0xbfffd928          0xbfffd928
lr             0xbbba0ad4          3149531860
pc             0xbbba0e84          0xbbba0e84
cpsr           <unavailable>
(gdb) x/i 0xbbba0e84
=> 0xbbba0e84:  Register 25 is not available
(gdb) x/i 0xbbba0e84
=> 0xbbba0e84:  Register 25 is not available
(gdb) info threads
  Id   Target Id         Frame 
* 1    process 1         0xbbba0e84 in ?? ()
  2    process 4         0xbb6fb098 in ?? ()
  3    process 3         0xbb6fbba0 in ?? ()
  4    process 2         0xbb6fbba0 in ?? ()

Note also the missing symbols (despite successfully loading them).

>How-To-Repeat:
s/a

>Fix:
n/a