From: Tejun Heo <htejun@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Berck E. Nash" <flyboy@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Jeff Garzik <jeff@garzik.org>,
linux-ide@vger.kernel.org
Subject: Re: 2.6.21-rc7-mm1 BUG at kernel/sched-clock.c:175 init_sched_clock()
Date: Wed, 25 Apr 2007 17:42:41 +0900 [thread overview]
Message-ID: <462F1481.8010807@gmail.com> (raw)
In-Reply-To: <20070425011654.222a2b4b.akpm@linux-foundation.org>
Andrew Morton wrote:
>> [ 2.953862] RIP: 0010:[<ffffffff803ae98b>] [<ffffffff803ae98b>] scsi_schedule_eh+0xa/0x57
>> [ 3.058672] [<ffffffff803e1e01>] ata_port_schedule_eh+0x4c/0x50
>> [ 3.064725] [<ffffffff803e1ea7>] ata_port_abort+0xa2/0xae
>> [ 3.070248] [<ffffffff803e1ef9>] ata_port_freeze+0x46/0x57
>> [ 3.075853] [<ffffffff803e4c39>] ahci_interrupt+0x300/0x47a
>> [ 3.081552] [<ffffffff8020eb83>] handle_IRQ_event+0x27/0x57
>> [ 3.087253] [<ffffffff8029a021>] handle_edge_irq+0xee/0x133
>> [ 3.092960] [<ffffffff8025f4e1>] do_IRQ+0x6d/0xd5
>> [ 3.097793] [<ffffffff80255071>] ret_from_intr+0x0/0xa
>> [ 3.103059] [<ffffffff8024e88b>] mwait_idle+0x46/0x4b
>> [ 3.108231] [<ffffffff802422f4>] cpu_idle+0x87/0xaa
>> [ 3.113227] [<ffffffff8025c988>] rest_init+0x49/0x4b
>> [ 3.118322] [<ffffffff805dca5d>] start_kernel+0x291/0x29c
>> [ 3.123837] [<ffffffff805dc13a>] _sinittext+0x13a/0x141
>>
>
> So we took an AHCI interrupt when ata_port.scsi_host was still NULL.
>
> It appears that ATA is presently requesting its IRQ before allocating all
> the resources which are needed to handle an interrupt. Does this
> (resource-leaky) patch fix things?
No, that would break host probing. The port is in frozen (controller
initialized and IRQs masked off) state, so it's not allowed to take
interrupt. If interrupt triggers at this point, it's low level driver
bug. Berck, how reliably can you reproduce this problem? Can you post
the result of 'lspci -nn'?
--
tejun
next prev parent reply other threads:[~2007-04-25 8:42 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <462E4C4D.9020806@gmail.com>
2007-04-25 8:16 ` 2.6.21-rc7-mm1 BUG at kernel/sched-clock.c:175 init_sched_clock() Andrew Morton
2007-04-25 8:42 ` Tejun Heo [this message]
2007-04-25 8:54 ` Tejun Heo
2007-04-25 9:30 ` Tejun Heo
2007-04-25 12:28 ` Berck E. Nash
2007-04-25 23:51 ` Berck E. Nash
2007-04-30 1:28 ` Tejun Heo
2007-04-30 12:07 ` Berck E. Nash
2007-05-01 9:02 ` Tejun Heo
2007-04-25 10:21 ` Alan Cox
2007-04-25 10:25 ` Alan Cox
2007-04-25 10:25 ` Tejun Heo
2007-04-25 10:35 ` Alan Cox
2007-04-25 8:55 ` Andrew Morton
2007-04-25 9:15 ` Tejun Heo
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