Re: 2.6.31-rc9 kernel BUG and mvsas

[Jeff Garzik <jeff@garzik.org>]

On 09/09/2009 12:30 PM, Thomas Fjellstrom wrote:
> No errors on that disk. Other than the one above, and its more of a warning.
> However, I just rebooted to add some extra drives, thinking everything was
> working a little better now that I've updated to 2.6.31-rc9, I'm treated to
> the following two messages right after boot (and a system lockup to boot):
>
> kernel: [  971.033138] ------------[ cut here ]------------
> kernel: [  971.033211] WARNING: at drivers/ata/libata-core.c:4913
> __ata_qc_complete+0x5a/0xe1 [libata]()
> kernel: [  971.033217] Hardware name: GA-MA790FXT-UD5P
> kernel: [  971.033221] Modules linked in: powernow_k8 cpufreq_conservative
> cpufreq_stats cpufreq_userspace cpufreq_powersave kvm_amd kvm nfsd exportfs
> nfs lockd fscache nfs_acl auth_rpcgss sunrpc bridge stp it87 hwmon_vid adt7473
> firewire_sbp2 loop md_mod snd_hda_codec_realtek snd_hda_intel snd_hda_codec
> snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_midi snd_rawmidi
> snd_seq_midi_event snd_seq snd_timer snd_seq_device snd amd64_edac_mod
> edac_core i2c_piix4 soundcore snd_page_alloc i2c_core evdev wmi parport_pc
> button parport processor ext3 jbd mbcache dm_mod sg sr_mod cdrom sd_mod
> crc_t10dif usbhid ata_generic ide_pci_generic hid mvsas firewire_ohci libsas
> firewire_core crc_itu_t scsi_transport_sas r8169 atiixp ide_core floppy ahci
> mii ohci_hcd libata ehci_hcd scsi_mod thermal fan thermal_sys [last unloaded:
> scsi_wait_scan]
> kernel: [  971.033337] Pid: 0, comm: swapper Not tainted 2.6.31-rc9 #2
> kernel: [  971.033342] Call Trace:
> kernel: [  971.033346]<IRQ>   [<ffffffffa00562ca>] ?
> __ata_qc_complete+0x5a/0xe1 [libata]
> kernel: [  971.033434]  [<ffffffffa00562ca>] ? __ata_qc_complete+0x5a/0xe1
> [libata]
> kernel: [  971.033446]  [<ffffffff8104aca0>] ? warn_slowpath_common+0x77/0xa3
> kernel: [  971.033455]  [<ffffffff81038d06>] ? enqueue_task+0x5c/0x65
> kernel: [  971.033496]  [<ffffffffa00562ca>] ? __ata_qc_complete+0x5a/0xe1
> [libata]
> kernel: [  971.033519]  [<ffffffffa00f7b59>] ? sas_ata_task_done+0x178/0x210
> [libsas]
> kernel: [  971.033528]  [<ffffffff8115ead1>] ? blk_run_queue+0x21/0x35
> kernel: [  971.033548]  [<ffffffffa010e2ce>] ? mvs_slot_complete+0x3df/0x41b
> [mvsas]
> kernel: [  971.033565]  [<ffffffffa010e39c>] ? mvs_int_rx+0x92/0x101 [mvsas]
> kernel: [  971.033583]  [<ffffffffa01112ba>] ? mvs_int_full+0x25/0x88 [mvsas]
> kernel: [  971.033600]  [<ffffffffa011134e>] ? mvs_64xx_isr+0x31/0x40 [mvsas]
> kernel: [  971.033617]  [<ffffffffa010d0e5>] ? mvs_interrupt+0x61/0x78 [mvsas]
> kernel: [  971.033625]  [<ffffffff8108aaac>] ? handle_IRQ_event+0x58/0x135
> kernel: [  971.033633]  [<ffffffff8108c1a1>] ? handle_fasteoi_irq+0x7d/0xb5
> kernel: [  971.033642]  [<ffffffff8101388d>] ? handle_irq+0x17/0x1d

That warning is triggered when an ata_queued_cmd is passed to completion 
without the ATA_QCFLAG_ACTIVE flag being set (which indicates the qc was 
started with some activity).

That possibly indicates the low-level driver (or libsas) was passing an 
already-completed cmd to libata.


> The added hard drives are connected to a Supermicro AOC-SASLP-MV8, which is
> based on a marvel MV64460/64461/64462 chipset, which uses the sata_mv driver.

Surely you mean 'mvsas' driver?

	Jeff