kern/50186: sparc memfault panic after 7.99.21 ARP changes

[jdbaker%mylinuxisp.com@localhost]

>Number:         50186
>Category:       kern
>Synopsis:       sparc memfault panic after 7.99.21 ARP changes
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Sep 01 03:40:00 +0000 2015
>Originator:     John D. Baker
>Release:        NetBSD/sparc-7.99.21
>Organization:
>Environment:
NetBSD jean.technoskunk.fur 7.99.21 NetBSD 7.99.21 (JEAN) #0: Mon Aug 31 20:21:50 CDT 2015  sysop%skuld.technoskunk.fur@localhost:/d0/build/current/obj/sparc/sys/arch/sparc/compile/JEAN sparc

NetBSD jean.technoskunk.fur 7.99.21 NetBSD 7.99.21 (GENERIC) #19: Mon Aug 31 20:03:50 CDT 2015  sysop%skuld.technoskunk.fur@localhost:/d0/build/current/obj/sparc/sys/arch/sparc/compile/GENERIC sparc

>Description:
Following the changes to ARP cache handling beginning with the
following commit:

  http://mail-index.netbsd.org/source-changes/2015/08/31/msg068612.html

sparc platform will panic after an indeterminate time (probably when
about to expire an ARP entry) as follows:

From custom kernel JEAN:

cpu0: data fault: pc=0xf008350c addr=0x10 sfsr=0x326<PERR=0x0,LVL=0x3,AT=0x1,FT=0x1,FAV,OW>
panic: kernel fault
Stopped in pid 0.5 (system) at  netbsd:cpu_Debugger+0x4:        or              %
o7, %g0, %g1
db> bt
cpu_Debugger(0xf03a4758, 0xf99efd20, 0xf0432400, 0xf04331a8, 0xf0433000, 0x104) a
t netbsd:panic+0x20
panic(0xf03a4758, 0x0, 0xf008350c, 0x10, 0xf99efd40, 0xf040cc00) at netbsd:mem_a
ccess_fault4m+0x5a4
mem_access_fault4m(0x9, 0x326, 0x10, 0xf99efde0, 0xf0409ff0, 0xf0a0d540) at netb
sd:memfault_sun4m+0xe8
memfault_sun4m(0xf0b366ac, 0x1, 0x0, 0xf041e318, 0xf0a0d544, 0xf0a0d544) at netb
sd:arptimer+0x6c
arptimer(0xf0b36600, 0xf0a0d540, 0xf0b39008, 0x0, 0xf0b366ac, 0xf0437800) at net
bsd:callout_softclock+0x154
callout_softclock(0xf041e31c, 0x1000000, 0x10000, 0xf041e318, 0xf0b36600, 0xf008
3478) at netbsd:softint_thread+0x94
softint_thread(0xf0a0d540, 0x3000, 0x2000, 0x0, 0x0, 0xf99e8218) at netbsd:lwp_t
rampoline+0x8
db>


From GENERIC:

cpu0: data fault: pc=0xf00a626c addr=0x10 sfsr=0x326<PERR=0x0,LVL=0x3,AT=0x1,FT=0x1,FAV,OW>
panic: kernel fault
Stopped in pid 0.5 (system) at  netbsd:cpu_Debugger+0x4:        or              %
o7, %g0, %g1
db> bt
cpu_Debugger(0xf03efb58, 0xf9ac7d20, 0xf0482c00, 0xf0483a58, 0xf0483800, 0x104) a
t netbsd:panic+0x20
panic(0xf03efb58, 0x0, 0xf00a626c, 0x10, 0xf9ac7d40, 0xf045c800) at netbsd:mem_a
ccess_fault4m+0x5b0
mem_access_fault4m(0x9, 0x326, 0x10, 0xf9ac7de0, 0xf0459b20, 0xf0a60540) at netb
sd:memfault_sun4m+0xe8
memfault_sun4m(0xf0b8852c, 0x1, 0x0, 0xf04712a0, 0xf0a60544, 0xf0a60544) at netb
sd:arptimer+0x6c
arptimer(0xf0b88480, 0xf0a60540, 0xf0b8c808, 0x0, 0xf0b8852c, 0xf0488800) at net
bsd:callout_softclock+0x154
callout_softclock(0xf04712a4, 0x1000000, 0x10000, 0xf04712a0, 0xf0b88480, 0xf00a
61d8) at netbsd:softint_thread+0x94
softint_thread(0xf0a60540, 0x3000, 0x2000, 0x0, 0x0, 0xf9ac0218) at netbsd:lwp_t
rampoline+0x8
db>

Machine is SPARCstation 5, 110Mhz, 256MB RAM.  Operating diskless.
(NetBSD-7.0_RC3 on local disk)

I hope to confirm this observation on another system, but it is
engaged in another task at this time.
>How-To-Repeat:
Build sparc release from 201509010100 or later and boot GENERIC.
>Fix: