Bug#433187: unkillable dpkg-query processes
From: Bernd Zeimetz <bernd@bzed.de>
Date: Sat, 27 Oct 2007 20:09:47 +0200
> titan:~# [ 2427.313946] BUG: soft lockup - CPU#3 stuck for 11s! [aptitude:13375]
> [ 2427.389128] TSTATE: 0000000011009602 TPC: 000000000042f93c TNPC: 000000000042f7d0 Y: 00000000 Not tainted
> [ 2427.506821] TPC: <__delay+0x1c/0x48>
> [ 2427.549494] g0: 0000000000009000 g1: 000000000042f7d0 g2: 00000000aaaaaaaa g3: 0000000055555555
> [ 2427.653670] g4: fffff8a00793c960 g5: fffff89fff994000 g6: fffff8a007dfc000 g7: 0000000000000000
> [ 2427.757835] o0: 0000000000000020 o1: 0000000000000020 o2: 0000000000000000 o3: 0000000000000000
> [ 2427.862001] o4: 000000000030a0d0 o5: 0000000000000000 sp: fffff8a007dff071 ret_pc: 000000000042f938
> [ 2427.970337] RPC: <__delay+0x18/0x48>
> [ 2428.013031] l0: 00000005a6cab647 l1: 0000000011009601 l2: 00000000004417a8 l3: 0000000000000400
> [ 2428.117206] l4: 0000000000000000 l5: 0000000000000001 l6: 0000000000000000 l7: 0000000000000008
> [ 2428.221374] i0: 0000000000000000 i1: fffff8a007dffa88 i2: 0000000000000004 i3: 0000000000000001
> [ 2428.325538] i4: 00000000ffffffff i5: 0000000000000000 i6: fffff8a007dff131 i7: 00000000004417ec
> [ 2428.429710] I7: <cheetah_xcall_deliver+0x1c0/0x23c>
>
> and an unkillable, cpu-eating aptitude.
One cpu can't send a message successfully to another cpu, likely
because it is stuck somewhere with interrupts off.
I was going to give you a patch like the one at the end of this email
to try and get a register dump from all cpus with Alt-Sysrq-p but that
is guarenteed not to work. It will just call back into
cheetah_xcall_deliver() and wedge further. Again, don't use the
patch, trying to get a register dump with it in this state will just
wedge the machine further.
I don't know how to suggest a way to debug this further, sorry.
I'm sick of these bugs and I need to reproduce all of these
UltraSPARC-III issues locally to fix them. So let's go.
Everyone who sees these UltraSPARC-III problems please send me PRECISE
and FULL description of how to install from scratch a machine and run
something that will trigger these errors.
DO NOT leave out any detail of your installation. Any minor omission
will mean that I potentially won't be able to reproduce this bug and
therefore I won't be able to fix it either.
If you are using NIS, say so and give the exact configuration. If you
have any modifications to some core configuration file like
/etc/nsswitch.conf, tell me. If you are using static IP addresses,
tell me. If you have netfilter enabled, tell me. If you have even
installed some extra package, like libnss-db or anything else, tell me
even if you think it's not in use.
In short I want a flawless cook-book style recipe for installing a
machine that I can reproduce this problem on. Do not omit any detail.
Thanks!
diff --git a/arch/sparc64/kernel/process.c b/arch/sparc64/kernel/process.c
index ca7cdfd..e10fdce 100644
--- a/arch/sparc64/kernel/process.c
+++ b/arch/sparc64/kernel/process.c
@@ -348,7 +348,7 @@ void show_regs(struct pt_regs *regs)
extern long etrap, etraptl1;
#endif
__show_regs(regs);
-#if 0
+#if 1
#ifdef CONFIG_SMP
{
extern void smp_report_regs(void);
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