Re: 2.6.33RC3 libvirtd ->sky2 & rcu oops (was Sky2 oops - Driver tries to sync DMA memory it has not allocated)

Michael Breuer
2010-01-10T20:10:56Z

On 1/9/2010 5:21 PM, Michael Breuer wrote:
> Hi,
>
> Attempting to move back to mainline after my recent 2.6.32 issues...
> Config is make oldconfig from working 2.6.32 config. Patch for
> af_packet.c (for skb issue found in 2.6.32) included. Attaching
> .config and NMI backtraces.
>
> System becomes unusable after bringing up the network:
>
> Jan 9 16:36:50 mail kernel: ------------[ cut here ]------------
> Jan 9 16:36:50 mail kernel: WARNING: at lib/dma-debug.c:902
> check_sync+0xbd/0x426()
> Jan 9 16:36:50 mail kernel: Hardware name: System Product Name
> Jan 9 16:36:50 mail kernel: sky2 0000:04:00.0: DMA-API: device driver
> tries to sync DMA memory it has not allocated [device
> address=0x0000000311686822] [size=60 bytes]
> Jan 9 16:36:50 mail kernel: Modules linked in: bridge stp appletalk
> psnap llc nfsd lockd nfs_acl auth_rpcgss exportfs hwmon_vid coretemp
> sunrpc acpi_cpufreq sit tunnel4 ipt_LOG ipt_MASQUERADE iptable_nat
> nf_nat iptable_mangle iptable_raw nf_conntrack_netbios_ns
> nf_conntrack_ftp nf_conntrack_ipv6 xt_multiport ip6table_filter
> xt_DSCP xt_dscp xt_MARK ip6table_mangle ip6_tables ipv6 dm_multipath
> kvm_intel kvm snd_hda_codec_analog snd_ens1371 gameport snd_rawmidi
> snd_ac97_codec snd_hda_intel ac97_bus snd_hda_codec snd_hwdep snd_seq
> gspca_spca505 snd_seq_device gspca_main snd_pcm videodev snd_timer snd
> v4l1_compat v4l2_compat_ioctl32 firewire_ohci soundcore snd_page_alloc
> iTCO_wdt i2c_i801 iTCO_vendor_support firewire_core crc_itu_t sky2
> pcspkr wmi asus_atk0110 hwmon fbcon tileblit font bitblit softcursor
> raid456 async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy
> async_tx raid1 ata_generic pata_acpi pata_marvell nouveau ttm
> drm_kms_helper drm agpgart fb i2c_algo_bit cfbcopyarea i2c_core
> cfbimgblt cfbfil
> Jan 9 16:36:50 mail kernel: lrect [last unloaded: scsi_wait_scan]
> Jan 9 16:36:50 mail kernel: Pid: 5271, comm: libvirtd Not tainted
> 2.6.33-rc3WITHMMAPNODMAR-00147-g3c8ad49-dirty #1
> Jan 9 16:36:50 mail kernel: Call Trace:
> Jan 9 16:36:50 mail kernel: <IRQ> [<ffffffff81049fe5>]
> warn_slowpath_common+0x7c/0x94
> Jan 9 16:36:50 mail kernel: [<ffffffff8104a054>]
> warn_slowpath_fmt+0x41/0x43
> Jan 9 16:36:50 mail kernel: [<ffffffff81261c0a>] check_sync+0xbd/0x426
> Jan 9 16:36:50 mail kernel: [<ffffffff813b2aff>] ?
> __netdev_alloc_skb+0x34/0x50
> Jan 9 16:36:50 mail kernel: [<ffffffff812622c6>]
> debug_dma_sync_single_for_cpu+0x42/0x44
> Jan 9 16:36:50 mail kernel: [<ffffffff8125f6c7>] ?
> swiotlb_sync_single+0x2a/0xb6
> Jan 9 16:36:50 mail kernel: [<ffffffff8125f823>] ?
> swiotlb_sync_single_for_cpu+0xc/0xe
> Jan 9 16:36:50 mail kernel: [<ffffffffa018efcb>]
> sky2_poll+0x4d5/0xaf0 [sky2]
> Jan 9 16:36:50 mail kernel: [<ffffffff8106a1a3>] ?
> sched_clock_cpu+0x44/0xce
> Jan 9 16:36:50 mail kernel: [<ffffffff81070573>] ?
> clockevents_program_event+0x7a/0x83
> Jan 9 16:36:50 mail kernel: [<ffffffff813b9766>]
> net_rx_action+0xb5/0x1f0
> Jan 9 16:36:50 mail kernel: [<ffffffff8105059c>] __do_softirq+0xf8/0x1cd
> Jan 9 16:36:50 mail kernel: [<ffffffff8109389a>] ?
> handle_IRQ_event+0x119/0x12b
> Jan 9 16:36:50 mail kernel: [<ffffffff8100ab1c>] call_softirq+0x1c/0x30
> Jan 9 16:36:50 mail kernel: [<ffffffff8100c2b3>] do_softirq+0x4b/0xa3
> Jan 9 16:36:50 mail kernel: [<ffffffff81050188>] irq_exit+0x4a/0x8c
> Jan 9 16:36:50 mail kernel: [<ffffffff8145a83c>] do_IRQ+0xac/0xc3
> Jan 9 16:36:50 mail kernel: [<ffffffff81455a93>] ret_from_intr+0x0/0x16
> Jan 9 16:36:50 mail kernel: <EOI> [<ffffffff8104474c>] ?
> set_cpus_allowed_ptr+0x22/0x14b
> Jan 9 16:36:50 mail kernel: [<ffffffff81087aff>]
> cpuset_attach_task+0x27/0x9c
> Jan 9 16:36:50 mail kernel: [<ffffffff81087bfe>]
> cpuset_attach+0x8a/0x133
> Jan 9 16:36:50 mail kernel: [<ffffffff81042cba>] ?
> sched_move_task+0x104/0x110
> Jan 9 16:36:50 mail kernel: [<ffffffff81085b4f>]
> cgroup_attach_task+0x4d5/0x533
> Jan 9 16:36:50 mail kernel: [<ffffffff81085e05>]
> cgroup_clone+0x258/0x2ac
> Jan 9 16:36:50 mail kernel: [<ffffffff81088a74>]
> ns_cgroup_clone+0x58/0x75
> Jan 9 16:36:50 mail kernel: [<ffffffff81048ec1>]
> copy_process+0xcef/0x13af
> Jan 9 16:36:50 mail kernel: [<ffffffff810d9044>] ?
> handle_mm_fault+0x355/0x7ff
> Jan 9 16:36:50 mail kernel: [<ffffffff8108f769>] ?
> audit_filter_rules+0x19a/0x7c5
> Jan 9 16:36:50 mail kernel: [<ffffffff810496ec>] do_fork+0x16b/0x309
> Jan 9 16:36:50 mail kernel: [<ffffffff81251d12>] ? __up_read+0x82/0x8a
> Jan 9 16:36:50 mail kernel: [<ffffffff81010f22>] sys_clone+0x28/0x2a
> Jan 9 16:36:50 mail kernel: [<ffffffff81009f33>] stub_clone+0x13/0x20
> Jan 9 16:36:50 mail kernel: [<ffffffff81009bf2>] ?
> system_call_fastpath+0x16/0x1b
> Jan 9 16:36:50 mail kernel: ---[ end trace cd5e0588bad4ec83 ]---
> Then... after a few more normal boot messages (samba starting up,
> etc.) I just see rcu stalls with NMI backtraces for each cpu. I've
> attached the first one - the rcu stall oops repeats until the reboot I
> forced.
Tracked this down to libvirtd. No idea why yet - but these oops occur
when starting libvirtd. Version of libvirt is 0.7.0-15.fc12.x86_64.

Also, checking back to 2.6.32 - found that the sky2 oops listed above
also occurs (started it seems after an update to
libvirt-java-0.4.0-1.fc12.noarch two days ago). However the subsequent
rcu stall doesn't happen on 2.6.32 - system behaves normally (which is
why I missed the oops).
Now running OK on 2.6.33 w/o libvirtd.