> Date: Tue, 6 Jul 2021 14:40:54 -0400 (EDT)
> From: k...@intricatesoftware.com
>
> >Synopsis: kernel data fault in data_access_fault
> >Category: sparc64
> >Environment:
> System : OpenBSD 6.9
> Details : OpenBSD 6.9-current (GENERIC.MP) #3: Thu Jul 1 18:00:32
> EDT 2021
>
> t...@oracle.intricatesoftware.com:/sys/arch/sparc64/compile/GENERIC.MP
>
> Architecture: OpenBSD.sparc64
> Machine : sparc64
> >Description:
> I noticed my T4-1 had paniced while sitting idle. Kernel built from
> sources on July 1:
>
> ddb{5}> show panic
> *cpu5: kernel data fault: pc=10122a4 addr=fe2620229c
> ddb{5}> trace
> data_access_fault(400e97cbcf0, 31, 10122a4, fe2620229c, fe26202000, 1) at
> data_
> access_fault+0x2f0
> sun4v_datatrap(400e97cbed0, fffffffffffffffe, fe98d08000, 44000002, 284bf, 0)
> a
> t sun4v_datatrap+0x210
> Lslowtrap_reenter(18, fea941b9b8, 18, 0, 0, 0) at Lslowtrap_reenter+0xf8
> ddb{5}> show uvm
> Current UVM status:
> pagesize=8192 (0x2000), pagemask=0x1fff, pageshift=13
> 1992286 VM pages: 78190 active, 26648 inactive, 1 wired, 1472221 free
> (184408
> zero)
> min 10% (25) anon, 10% (25) vnode, 5% (12) vtext
> freemin=66409, free-target=88545, inactive-target=0, wired-max=664095
> faults=312471313, traps=337046503, intrs=-1254972556, ctxswitch=446408195
> fpu
> switch=7019652
> softint=12672729, syscalls=514395307, kmapent=13
> fault counts:
> noram=0, noanon=0, noamap=0, pgwait=0, pgrele=0
> ok relocks(total)=153776(154263), anget(retries)=38912386(0),
> amapcopy=2551
> 1212
> neighbor anon/obj pg=8334997/29957405, gets(lock/unlock)=20055546/154263
> cases: anon=36090037, anoncow=2822349, obj=17784842, prcopy=2270217,
> przero
> =252644295
> daemon and swap counts:
> woke=0, revs=0, scans=0, obscans=0, anscans=0
> busy=0, freed=0, reactivate=0, deactivate=0
> pageouts=0, pending=0, nswget=0
> nswapdev=1
> swpages=2064384, swpginuse=0, swpgonly=0 paging=0
> kernel pointers:
> objs(kern)=0x1c62428
> ddb{5}> show bcstats
> Current Buffer Cache status:
> numbufs 186794 busymapped 0, delwri 12
> kvaslots 49807 avail kva slots 49807
> bufpages 373572, dmapages 373572, dirtypages 24
> pendingreads 0, pendingwrites 0
> highflips 0, highflops 0, dmaflips 0
> ddb{5}> machine ddbcpu 0
> Stopped at cpu_idle_cycle+0x44: and %g1, -0x3, %g1
> sched_idle(2018360, 4001516ed70, 194f440, 185e9b8, 0, 3b9ac800) at
> sched_idle+0
> x158
> proc_trampoline(0, 0, 0, 0, 0, 0) at proc_trampoline+0x14
> ddb{0}> trace
> sched_idle(2018360, 4001516ed70, 194f440, 185e9b8, 0, 3b9ac800) at
> sched_idle+0
> x158
> proc_trampoline(0, 0, 0, 0, 0, 0) at proc_trampoline+0x14
> ddb{0}> machine ddbcpu 1
> Stopped at cpu_idle_cycle+0x44: and %g1, -0x3, %g1
> sched_idle(400e0628360, 4001516eac0, 194f440, 0, 0, 3b9ac800) at
> sched_idle+0x1
> 58
> proc_trampoline(0, 0, 0, 0, 0, 0) at proc_trampoline+0x14
> ddb{1}> machine ddbcpu 2
> Stopped at cpu_idle_cycle+0x44: and %g1, -0x3, %g1
> sched_idle(400e0638360, 4001516f020, 194f440, e80, 44, 3b9ac800) at
> sched_idle+
> 0x158
> proc_trampoline(0, 0, 0, 0, 0, 0) at proc_trampoline+0x14
> ddb{2}> machine ddbcpu 3
> Stopped at cpu_idle_cycle+0x44: and %g1, -0x3, %g1
> sched_idle(400e0648360, 4001516f580, 194f440, 4001512c688, 0, 3b9ac800) at
> sche
> d_idle+0x158
> proc_trampoline(0, 0, 0, 0, 0, 0) at proc_trampoline+0x14
> ddb{3}> machine ddbcpu 4
> Stopped at __mp_lock+0x68: ld [%o0 + 0x800], %g1
> syscall_setup(ffffffffffffffff, fffffffffffe42a0, 0, 0, 0, 3e204d5fa0) at
> sysca
> ll_setup+0x134
> ddb{4}> trace
> syscall_setup(ffffffffffffffff, fffffffffffe42a0, 0, 0, 0, 3e204d5fa0) at
> sysca
> ll_setup+0x134
> ddb{4}> machine ddbcpu 5
> Stopped at db_enter+0xc: jmpl [%o7 + 0x8], %g0
> data_access_fault(400e97cbcf0, 31, 10122a4, fe2620229c, fe26202000, 1) at
> data_
> access_fault+0x2f0
> sun4v_datatrap(400e97cbed0, fffffffffffffffe, fe98d08000, 44000002, 284bf, 0)
> a
> t sun4v_datatrap+0x210
> Lslowtrap_reenter(18, fea941b9b8, 18, 0, 0, 0) at Lslowtrap_reenter+0xf8
> ddb{5}> machine ddbcpu 6
> Stopped at cpu_idle_cycle+0x44: and %g1, -0x3, %g1
> sched_idle(400e0678360, 40015161840, 194f440, 0, 0, 3b9ac800) at
> sched_idle+0x1
> 58
> proc_trampoline(0, 0, 0, 0, 0, 0) at proc_trampoline+0x14
> ddb{6}> machine ddbcpu 7
> Stopped at cpu_idle_cycle+0x44: and %g1, -0x3, %g1
> sched_idle(400e0688360, 400151612e0, 0, 0, 0, 0) at sched_idle+0x158
> proc_trampoline(0, 0, 0, 0, 0, 0) at proc_trampoline+0x14
> ddb{7}> machine ddbcpu 8
> Stopped at cpu_idle_cycle+0x44: and %g1, -0x3, %g1
> sched_idle(400e0698360, 40015160ad0, 0, 0, 0, 0) at sched_idle+0x158
> proc_trampoline(0, 0, 0, 0, 0, 0) at proc_trampoline+0x14
> ddb{8}> machine ddbcpu 9
> Stopped at cpu_idle_cycle+0x44: and %g1, -0x3, %g1
> sched_idle(400e06a8360, 40015160820, 0, 0, 0, 0) at sched_idle+0x158
> proc_trampoline(0, 0, 0, 0, 0, 0) at proc_trampoline+0x14
> ...
> ddb{62}> machine ddbcpu 0x3f
> Stopped at cpu_idle_cycle+0x44: and %g1, -0x3, %g1
> sched_idle(400e0a08360, 40015142b20, 0, 0, 0, 0) at sched_idle+0x158
> proc_trampoline(0, 0, 0, 0, 0, 0) at proc_trampoline+0x14
>
> /sys/arch/sparc64/sparc64/trap.c:869
> 2f0: 84 10 a0 00 mov %g2, %g2
> 2f0: R_SPARC_M44 uvmexp
>
> /sys/arch/sparc64/sparc64/trap.c:869
> uvmexp.traps++;
I fear there's nothing in there that provides a useful hint what went
wrong.
