kern/54282: kernel panic when 'sysctl hw.audio0'

[coypu%sdf.org@localhost]

>Number:         54282
>Category:       kern
>Synopsis:       kernel panic when 'sysctl hw.audio0'
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jun 07 02:20:00 +0000 2019
>Originator:     coypu
>Release:        NetBSD 8.99.42
>Organization:
>Environment:
NetBSD plu 8.99.42 NetBSD 8.99.42 (GENERIC) #3: Thu Jun  6 17:24:35 IDT 2019  fly@plu:/home/fly/obj2/sys/arch/amd64/compile/GENERIC amd64

>Description:
Playing audio. I wanted to tune things.
sysctl hw.audio0 (read only)


[ 40243.607036] fatal protection fault in supervisor mode
[ 40243.617050] trap type 4 code 0 rip 0xffffffff807a48ad cs 0x8 rflags 0x10206 cr2 0x7f7fffff4ff8 ilevel 0 rsp 0xffff96017f7a3dd0
[ 40243.617050] curlwp 0xfffffe54ee54b0a0 pid 17473.1 lowest kstack 0xffff96017f7a02c0
[ 40243.617050] panic: trap
[ 40243.617050] cpu3: Begin traceback...
[ 40243.617050] vpanic() at netbsd:vpanic+0x160
[ 40243.617050] snprintf() at netbsd:snprintf
[ 40243.617050] startlwp() at netbsd:startlwp
[ 40243.617050] alltraps() at netbsd:alltraps+0xc3
[ 40243.617050] sysctl_dispatch() at netbsd:sysctl_dispatch+0xb4
[ 40243.617050] sys___sysctl() at netbsd:sys___sysctl+0xc5
[ 40243.617050] syscall() at netbsd:syscall+0x181
[ 40243.617050] --- syscall (number 202) ---
[ 40243.617050] 6f9472b9959a:
[ 40243.617050] cpu3: End traceback...

Unfortunately this doesn't give information about which sysctl it is.


(gdb) info line *(sysctl_dispatch+0xb4)
Line 461 of "/cvs/src/sys/kern/kern_sysctl.c" starts at address 0xffffffff809e4a6f <sysctl_dispatch+180> and ends at 0xffffffff809e4a7e <sysctl_dispatch+195>.


>How-To-Repeat:

>Fix: