linux-kernel - Re: [ANNOUNCE] 2.6.31-rc4-rt1

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Date:	Fri, 07 Aug 2009 07:30:04 -0700
From:	Darren Hart <dvhltc@...ibm.com>
To:	Sripathi Kodi <sripathik@...ibm.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	rt-users <linux-rt-users@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Clark Williams <williams@...hat.com>
Subject: Re: [ANNOUNCE] 2.6.31-rc4-rt1

Sripathi Kodi wrote:
> On Thu, 30 Jul 2009 02:48:04 +0200 (CEST)
> Thomas Gleixner <tglx@...utronix.de> wrote:
> 
>> We are pleased to announce the next update to our new preempt-rt
>> series.
>>
>>     - update to 2.6.31-rc4
>>
>> This is a major rework of the rt patch series. Thanks to Clark
>> Williams and John Kacur for providing the merge to 2.6.30 while I was
>> stabilizing .29-rt. While the 30-rt series looked quite stable, we
>> decided to skip 30-rt entirely to keep track with the ongoing mainline
>> development for various reaons. The .31-rt series is planned to be
>> stabilized as we have done with .29-rt.
> 
> I searched the mails in this chain, but did not find the following
> BUG reported yet. I hit this once while booting up.

I hit this occasionally as well.

--
Darren

> 
> INIT: version 2.86 bootingBUG: unable to handle kernel NULL pointer dereference at 0000000000000024
> IP: [<ffffffff81050fe6>] try_to_wake_up+0x3b/0x2e2
> PGD 0 
> Oops: 0000 [#1] PREEMPT SMP 
> last sysfs file: /sys/block/sda/dev
> CPU 5 
> Modules linked in: dm_region_hash dm_log dm_mod ata_piix libata shpchp mptsas mptscsih mptbase scsi_transport_sas sd_mod scsi_mod crc_t10dif ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd
> Pid: 0, comm: swapper Not tainted 2.6.31-rc4-rt1 #1 IBM eServer BladeCenter HS21 -[7995AAA]-
> RIP: 0010:[<ffffffff81050fe6>]  [<ffffffff81050fe6>] try_to_wake_up+0x3b/0x2e2
> RSP: 0018:ffff880028199e38  EFLAGS: 00010082
> RAX: 0000000000000000 RBX: 000000000000001e RCX: 0000000000000000
> RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000000
> RBP: ffff880028199e88 R08: b000000000000000 R09: 0000000000000001
> R10: 0000000000000001 R11: 017dbbb7ec537836 R12: 0000000000000000
> R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
> FS:  0000000000000000(0000) GS:ffff880028196000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
> CR2: 0000000000000024 CR3: 0000000001001000 CR4: 00000000000006e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process swapper (pid: 0, threadinfo ffff88022f342000, task ffff88022f340000)
> Stack:
>  ffffffff810bd00b 00000000ec537836 ffffffff81619840 ffff88022c58e640
> <0> 017dbbb7ec537836 ffffffff81619840 ffff88022c58e640 0000000000000001
> <0> 0000000000000004 0000000000000000 ffff880028199ea8 ffffffff810513fb
> Call Trace:
>  <IRQ> 
>  [<ffffffff810bd00b>] ? handle_edge_irq+0x35/0x13d
>  [<ffffffff810513fb>] wake_up_process+0x2a/0x40
>  [<ffffffff810baf12>] handle_IRQ_event+0x169/0x1a1
>  [<ffffffff810bd0b7>] handle_edge_irq+0xe1/0x13d
>  [<ffffffff8100f031>] handle_irq+0x9d/0xbf
>  [<ffffffff8100acc9>] ? exit_idle+0x33/0x49
>  [<ffffffff813f0b12>] do_IRQ+0x72/0xd9
>  [<ffffffff8100cc93>] ret_from_intr+0x0/0xa
>  <EOI> 
>  [<ffffffff810151dd>] ? mwait_idle+0x8b/0xb2
>  [<ffffffff810151d0>] ? mwait_idle+0x7e/0xb2
>  [<ffffffff8100abfe>] ? enter_idle+0x38/0x4e
>  [<ffffffff8100b3da>] ? cpu_idle+0xae/0x100
>  [<ffffffff813e3f4e>] ? start_secondary+0x19d/0x1b8
> Code: 28 0f 1f 44 00 00 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 80 3d 09 e4 5c 00 00 41 89 d6 89 4d bc 49 89 fc 89 f3 44 0f 49 f0 <83> 7f 24 63 44 0f 4e f0 48 8d 75 c8 89 db e8 95 53 ff ff 48 89 
> RIP  [<ffffffff81050fe6>] try_to_wake_up+0x3b/0x2e2
>  RSP <ffff880028199e38>
> CR2: 0000000000000024
> ---[ end trace f21e517c335b6dab ]---
> Kernel panic - not syncing: Fatal exception in interrupt
> 
> Thanks,
> Sripathi.
> 
> <snip>
> --
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-- 
Darren Hart
IBM Linux Technology Center
Real-Time Linux Team
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