linux-kernel - Re: 2.6.27-rc6 xen soft lockup

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Date:	Wed, 10 Sep 2008 20:43:03 +0200
From:	Rambaldi <rambaldi@...all.nl>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.27-rc6 xen soft lockup

Jeremy Fitzhardinge wrote:
> Rambaldi wrote:
>> Hi,
>>
>> I got the following bug while running the 2.6.27-rc6 kernel as a 64
>> bit domU:
>>
>>
>> BUG: soft lockup - CPU#1 stuck for 4125s! [swapper:0]
> 
> Is the domain very idle?  This indicates the vcpu has been idle for over
> an hour.
> 
> Did anything fail or misbehave?
> 
> The soft lockup detector is supposed to deal with very idle cpus, and
> with dynticks I guess its possible for a cpu to go for over an hour with
> no interrupts (more likely in the virtual case where all the virtual
> device interrupts are bound to vcpu 0 and there's nothing much else to
> interrupt it).
> 
>     J
> 
The machine has two Intel(R) Xeon(R) E5420's so that gives a total of 8 cpu's
During the time of the lockup the cpu load, as measured with cacti, was about 4%
with a increase to 15% at the time the BUG was triggered. So I would say mostly idle
but not very idle.

 > Did anything fail or misbehave?
No nothing failed or misbehaved (as far as I could tell)

With dynticks I guess you mean: CONFIG_NO_HZ ; this option is not set.
I have attached my .config. I have also attached the output of
(date ; cat /proc/interrupts ; sleep 10 ; date ;  cat /proc/interrupts )> /tmp/interrupts
to give an impression about the number of interrupts after 11:30 hours of uptime.

Any other info that you need?

TIA

R




>> Modules linked in: sit ts_bm xt_string ipt_LOG xt_limit iptable_filter
>> iptable_nat nf_nat nf_conntrack_ipv4 ip_tables nf_conntrack_ipv6
>> xt_state nf_conntrack xt_tcpudp ip6table_filter ip6_tables x_tables
>> usbcore nfsd lockd auth_rpcgss sunrpc exportfs reiserfs ipv6
>> CPU 1:
>> Modules linked in: sit ts_bm xt_string ipt_LOG xt_limit iptable_filter
>> iptable_nat nf_nat nf_conntrack_ipv4 ip_tables nf_conntrack_ipv6
>> xt_state nf_conntrack xt_tcpudp ip6table_filter ip6_tables x_tables
>> usbcore nfsd lockd auth_rpcgss sunrpc exportfs reiserfs ipv6
>> Pid: 0, comm: swapper Not tainted 2.6.27-rc6 #2
>> RIP: e030:[<ffffffff802093aa>]  [<ffffffff802093aa>] _stext+0x3aa/0x1000
>> RSP: e02b:ffff8800f0869f28  EFLAGS: 00000246
>> RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff802093aa
>> RDX: ffff8800f0868000 RSI: 0000000000000000 RDI: 0000000000000001
>> RBP: 0000000000000000 R08: 0000000000000000 R09: ffff880001542478
>> R10: ffff8800f0a27e90 R11: 0000000000000246 R12: 0000000000000000
>> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>> FS:  00007fe2c6a8a710(0000) GS:ffff8800f084cec0(0000)
>> knlGS:0000000000000000
>> CS:  e033 DS: 002b ES: 002b CR0: 000000008005003b
>> CR2: 00007fe2c6aab000 CR3: 00000000cc292000 CR4: 0000000000002620
>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>>
>> Call Trace:
>>  [<ffffffff803f9a39>] unix_poll+0x0/0xa4
>>  [<ffffffff8020a533>] xen_safe_halt+0xc/0x15
>>  [<ffffffff8020b953>] xen_idle+0x33/0x48
>>  [<ffffffff8020e883>] cpu_idle+0x45/0x63
>>
>>
> 
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View attachment ".config" of type "text/plain" (41220 bytes)

View attachment "interrupts" of type "text/plain" (15395 bytes)