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    SubjectRe: Regression: sky2 kernel between 3.1 and 3.2.1 (last known good 3.0.9)
    On 1/16/2012 11:39 AM, Michael Breuer wrote:
    > Synopsis:
    >
    > Receiving DMAR and other errors after approximately three days of
    > uptime. The symptoms exactly match errors seen and then fixed around
    > 2.6.32.4.
    >
    > While the system remains unaffected for too long to do a bisect, I was
    > able to confirm that the problem exists in the 3.1 stable branch (I
    > jumped from 3.0 to 3.2 when 3.2. was released).
    >
    > For now I reverted to the sky2.c from 3.0.9 and am running the rest of
    > the kernel from 3.1.2, but won't be certain that this works until
    > later in the week.
    >
    > Note that 20 seconds prior to the log extract below were DHCP renewal
    > attempts on eth1, the issue below was on eth0. Not sure it's relevant,
    > however back in 2010 a preceding DHCP event did turn out to be
    > relevant to the manifestation of the bug.
    >
    > The 3.2.1-dirty I'm running is from git with a single local patch -
    > for sidewinder force-feedback support (shouldn't be relevant to the
    > sky2 issue).
    >
    > Log extract:
    >
    > Jan 16 05:49:46 mail kernel: [198230.628919] DRHD: handling fault
    > status reg 2
    > Jan 16 05:49:46 mail kernel: [198230.628925] sky2 0000:06:00.0: error
    > interrupt status=0x80000000
    > Jan 16 05:49:46 mail kernel: [198230.628929] DMAR:[DMA Read] Request
    > device [06:00.0] fault addr fff78000
    > Jan 16 05:49:46 mail kernel: [198230.628931] DMAR:[fault reason 06]
    > PTE Read access is not set
    > Jan 16 05:49:46 mail kernel: [198230.628939] sky2 0000:06:00.0: PCI
    > hardware error (0x2010)
    > Jan 16 05:49:53 mail dhclient[1616]: DHCPREQUEST on eth1 to
    > 10.240.184.29 port 67
    > Jan 16 05:50:01 mail kernel: [198246.288400] ------------[ cut here
    > ]------------
    > Jan 16 05:50:01 mail kernel: [198246.288408] WARNING: at
    > net/sched/sch_generic.c:255 dev_watchdog+0x247/0x250()
    > Jan 16 05:50:01 mail kernel: [198246.288411] Hardware name: System
    > Product Name
    > Jan 16 05:50:01 mail kernel: [198246.288413] NETDEV WATCHDOG: eth0
    > (sky2): transmit queue 0 timed out
    > Jan 16 05:50:01 mail kernel: [198246.288415] Modules linked in: tcp_lp
    > cpufreq_stats ebtable_nat ebtables nf_conntrack_netbios_ns
    > nf_conntrack_broadcast ip6table_mangle ip6table_filter ip6_tables
    > iptable_mangle ipt_MASQUERADE iptable_nat nf_nat iptable_raw tun
    > bridge stp llc lockd sit tunnel4 ipt_LOG nf_conntrack_ftp
    > nf_conntrack_ipv6 nf_defrag_ipv6 xt_CHECKSUM xt_multiport xt_DSCP
    > w83627ehf xt_mark xt_dscp hwmon_vid binfmt_misc raid1 btrfs sunrpc
    > zlib_deflate libcrc32c snd_hda_codec_analog snd_ens1371 gameport
    > snd_hda_intel snd_rawmidi snd_ac97_codec snd_hda_codec snd_hwdep
    > ac97_bus snd_seq snd_seq_device snd_pcm gspca_spca505 snd_timer
    > gspca_main snd videodev media soundcore i2c_i801 iTCO_wdt microcode
    > v4l2_compat_ioctl32 snd_page_alloc i7core_edac sky2 edac_core pcspkr
    > iTCO_vendor_support virtio_net virtio virtio_ring kvm_intel kvm uinput
    > ipv6 raid456 async_raid6_recov async_pq raid6_pq async_xor
    > firewire_ohci firewire_core pata_acpi ata_generic xor async_memcpy
    > async_tx crc_itu_t pata_marvell nouveau ttm d
    > Jan 16 05:50:01 mail kernel: rm_kms_helper drm i2c_algo_bit i2c_core
    > mxm_wmi video [last unloaded: nf_conntrack_broadcast]
    > Jan 16 05:50:01 mail kernel: [198246.288487] Pid: 0, comm: swapper/0
    > Tainted: G W 3.2.1-dirty #1
    > Jan 16 05:50:01 mail kernel: [198246.288489] Call Trace:
    > Jan 16 05:50:01 mail kernel: [198246.288491] <IRQ>
    > [<ffffffff81050a4f>] warn_slowpath_common+0x7f/0xc0
    > Jan 16 05:50:01 mail kernel: [198246.288501] [<ffffffff8101f0bd>] ?
    > lapic_next_event+0x1d/0x30
    > Jan 16 05:50:01 mail kernel: [198246.288504] [<ffffffff81050b46>]
    > warn_slowpath_fmt+0x46/0x50
    > Jan 16 05:50:01 mail kernel: [198246.288509] [<ffffffff81009319>] ?
    > read_tsc+0x9/0x20
    > Jan 16 05:50:01 mail kernel: [198246.288513] [<ffffffff814a81e7>]
    > dev_watchdog+0x247/0x250
    > Jan 16 05:50:01 mail kernel: [198246.288518] [<ffffffff8105fbbb>]
    > run_timer_softirq+0x12b/0x3b0
    > Jan 16 05:50:01 mail kernel: [198246.288521] [<ffffffff814a7fa0>] ?
    > qdisc_reset+0x50/0x50
    > Jan 16 05:50:01 mail kernel: [198246.288525] [<ffffffff81057d18>]
    > __do_softirq+0xa8/0x210
    > Jan 16 05:50:01 mail kernel: [198246.288529] [<ffffffff8157496c>]
    > call_softirq+0x1c/0x30
    > Jan 16 05:50:01 mail kernel: [198246.288533] [<ffffffff810041e5>]
    > do_softirq+0x65/0xa0
    > Jan 16 05:50:01 mail kernel: [198246.288536] [<ffffffff810580fe>]
    > irq_exit+0x8e/0xb0
    > Jan 16 05:50:01 mail kernel: [198246.288539] [<ffffffff815750a3>]
    > do_IRQ+0x63/0xe0
    > Jan 16 05:50:01 mail kernel: [198246.288543] [<ffffffff8156ad2e>]
    > common_interrupt+0x6e/0x6e
    > Jan 16 05:50:01 mail kernel: [198246.288545] <EOI>
    > [<ffffffff81307b6d>] ? intel_idle+0xed/0x150
    > Jan 16 05:50:01 mail kernel: [198246.288551] [<ffffffff81307b4f>] ?
    > intel_idle+0xcf/0x150
    > Jan 16 05:50:01 mail kernel: [198246.288555] [<ffffffff8144d331>]
    > cpuidle_idle_call+0xc1/0x280
    > Jan 16 05:50:01 mail kernel: [198246.288559] [<ffffffff8100122a>]
    > cpu_idle+0xca/0x120
    > Jan 16 05:50:01 mail kernel: [198246.288563] [<ffffffff8154741e>]
    > rest_init+0x72/0x74
    > Jan 16 05:50:01 mail kernel: [198246.288568] [<ffffffff81b6abdd>]
    > start_kernel+0x3b5/0x3c0
    > Jan 16 05:50:01 mail kernel: [198246.288572] [<ffffffff81b6a32b>]
    > x86_64_start_reservations+0x132/0x136
    > Jan 16 05:50:01 mail kernel: [198246.288576] [<ffffffff81b6a140>] ?
    > early_idt_handlers+0x140/0x140
    > Jan 16 05:50:01 mail kernel: [198246.288580] [<ffffffff81b6a431>]
    > x86_64_start_kernel+0x102/0x111
    > Jan 16 05:50:01 mail kernel: [198246.288583] ---[ end trace
    > bb26011d21a2b1d7 ]---
    > Jan 16 05:50:01 mail kernel: [198246.288586] sky2 0000:06:00.0: eth0:
    > tx timeout
    > Jan 16 05:50:01 mail kernel: [198246.288593] sky2 0000:06:00.0: eth0:
    > transmit ring 115 .. 10 report=115 done=115
    >
    >
    >
    FYI - I've been up for four days now without issues running on 3.2.1 +
    sky2.c from 3.0.9. Looks like the issue is in fact in one of the
    modifications made in sky2.c between those two releases.

    --
    Mike


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