From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo 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 Message-ID: <462F1481.8010807@gmail.com> References: <462E4C4D.9020806@gmail.com> <20070425011654.222a2b4b.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20070425011654.222a2b4b.akpm@linux-foundation.org> Sender: linux-kernel-owner@vger.kernel.org To: Andrew Morton Cc: "Berck E. Nash" , "linux-kernel@vger.kernel.org" , Jeff Garzik , linux-ide@vger.kernel.org List-Id: linux-ide@vger.kernel.org Andrew Morton wrote: >> [ 2.953862] RIP: 0010:[] [] scsi_schedule_eh+0xa/0x57 >> [ 3.058672] [] ata_port_schedule_eh+0x4c/0x50 >> [ 3.064725] [] ata_port_abort+0xa2/0xae >> [ 3.070248] [] ata_port_freeze+0x46/0x57 >> [ 3.075853] [] ahci_interrupt+0x300/0x47a >> [ 3.081552] [] handle_IRQ_event+0x27/0x57 >> [ 3.087253] [] handle_edge_irq+0xee/0x133 >> [ 3.092960] [] do_IRQ+0x6d/0xd5 >> [ 3.097793] [] ret_from_intr+0x0/0xa >> [ 3.103059] [] mwait_idle+0x46/0x4b >> [ 3.108231] [] cpu_idle+0x87/0xaa >> [ 3.113227] [] rest_init+0x49/0x4b >> [ 3.118322] [] start_kernel+0x291/0x29c >> [ 3.123837] [] _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