linux-kernel - 3.6 Regression: kernel NULL pointer dereference in pacpi_set

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Date:	Thu, 11 Oct 2012 15:24:57 +0400
From:	"Anton V. Boyarshinov" <boyarsh@...linux.org>
To:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: 3.6 Regression: kernel NULL pointer dereference in
 pacpi_set_dmamode

Hello,
We have an early boot crash in 3.6 and 3.6.1 on many machines, using
nvidia chipsets. Boot fails in 1 case to 10 boots or 9 cases in 10 boots, depending on machine.

The head of log, got via serial console(full log attached):
-------------------------------------------
2.672343Ü BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
2.676024Ü IP: Ä<ffffffffa001e29c>Ü pacpi_set_dmamode+0x5c/0xc0 Äpata_acpiÜ
2.676024Ü PGD 115076067 PUD 1167f1067 PMD 0 
2.676024Ü Oops: 0000 Ä#1Ü PREEMPT SMP 
2.676024Ü Modules linked in: ata_generic sata_nv pata_acpi libata scsi_mod ide_pci_generic ide_core
2.703078Ü CPU 1 
2.703078Ü Pid: 644, comm: scsi_eh_2 Not tainted 3.6.1-un-def-alt2
#1 System manufacturer System Product Name/M2NPV-VM
-------------------------------------------

Disabling on-board IDE controller in BIOS seems to workarownd the problem.

Regards,
Anton

Download attachment "3.6.1-boot-crash-pacpi_set_dmamode" of type "application/octet-stream" (27387 bytes)