On Mon, 16 Feb 2009 20:53:43 -0600 Robert Hancock <hancockrwd@xxxxxxxxx> wrote: > Chuck Ebbert wrote: > > On Thu, 12 Feb 2009 21:03:38 -0600 > > Robert Hancock <hancockrwd@xxxxxxxxx> wrote: > > > >> Chuck Ebbert wrote: > >>> Fedora rawhide has the DMA API debug patch applied and it has found this... > >>> > >>> From https://bugzilla.redhat.com/show_bug.cgi?id=485172 > >>> > >>> WARNING: at lib/dma-debug.c:439 check_unmap+0x16a/0x3dd() (Tainted: G W > >>> ) > >>> Hardware name: System Product Name > >>> sata_nv 0000:00:0d.0: DMA-API: device driver frees DMA memory with different > >>> size [device address=0x00000000da031000] [map size=4096 bytes] [unmap > >>> size=8192bytes] > >>> Modules linked in: bridge stp llc bnep sco l2cap bluetooth sunrpc ip6t_REJECT > >>> nf_conntrack_ipv6 ip6table_filter ip6_tables ipv6 cpufreq_ondemand > >>> powernow_k8freq_table dm_multipath uinput snd_hda_codec_analog snd_hda_intel > >>> snd_hda_codec snd_hwdep snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq > >>> snd_seq_device snd_pcm_oss ppdev snd_mixer_oss snd_pcm snd_timer firewire_ohci > >>> snd firewire_core soundcore aic7xxx snd_page_alloc jedec_probe crc_itu_t > >>> forcedeth scsi_transport_spi pcspkr cfi_probe gen_probe sata_sil24 parport_pc > >>> cfi_util parport mtd chipreg i2c_nforce2 map_funcs asus_atk0110 pata_amd > >>> i2c_core hwmon ata_generic pata_acpi sata_nv raid456 async_xor async_memcpy > >>> async_tx xor raid1 sha256_generic cbc aes_x86_64 aes_generic dm_crypt ext4 jbd2 > >>> crc16 [last unloaded: scsi_wait_scan] > >>> Pid: 0, comm: swapper Tainted: G W 2.6.29-0.99.rc4.git1.fc11.x86_64 #1 > >>> Call Trace: > >>> <IRQ> [<ffffffff81048822>] warn_slowpath+0xb7/0xe7 > >>> [<ffffffff8137bc4f>] ? _spin_lock_irqsave+0x78/0x86 > >>> [<ffffffff8119851b>] ? get_hash_bucket+0x28/0x34 > >>> [<ffffffff8106a5ae>] ? trace_hardirqs_off_caller+0x1f/0xac > >>> [<ffffffff81198a15>] check_unmap+0x16a/0x3dd > >>> [<ffffffff810388a7>] ? resched_task+0x2e/0x74 > >>> [<ffffffff81198d66>] debug_dma_unmap_sg+0x7c/0x9b > >>> [<ffffffff8106a648>] ? trace_hardirqs_off+0xd/0xf > >>> [<ffffffff8124fef9>] ata_sg_clean+0x96/0xd0 > >>> [<ffffffff8124ff89>] __ata_qc_complete+0x56/0xc9 > >>> [<ffffffff8125018b>] ata_qc_complete+0x18f/0x198 > >>> [<ffffffffa00cb249>] nv_swncq_interrupt+0x358/0x688 [sata_nv] > >> That's rather curious. It seems to be saying that the sg length is > >> different between the map and unmap, but it doesn't look like sata_nv > >> mucks with that anywhere, and neither does libata core.. > > > > Could the SCSI code have merged two requests? > > I wouldn't think so.. and if it did it seems like it would have to have > changed the list after libata got the request somehow.. Does this box uses GART IOMMU? -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
