Re: Oops in microcode sysfs registration,

[Dmitry Adamushko]

2008/7/29 Alistair John Strachan <alistair@xxxxxxxxxxxxx>:
> On Tuesday 29 July 2008 17:22:14 Pekka Paalanen wrote:
>> > Also, I'm sure this is reproducible without the NVIDIA garbage, but I was
>> > too lazy to test it. If you want me to repeat the experiment without the
>> > driver I would be more than happy to do so.
>>
>> I'm not sure people are willing to look into this without a clean report,
>> so this would be cool. There's even a test module for mmiotrace in the
>> kernel, but I doubt it would make difference to use it or not, when trying
>> to reproduce the crash without the blob.
>
> Of course, and I should have attempted to reproduce without the driver.
> Fortunately that was easy: it is not an NVIDIA driver bug.
>
> Steps to reproduce: have CONFIG_MICROCODE=y and a suitable Intel
> processor, then do:
>
> echo mmiotrace >/debug/tracing/current_tracer
> echo none >/debug/tracing/current_tracer
>
> And you get this (snipped) oops:
>
> in mmio_trace_init
> mmiotrace: Disabling non-boot CPUs...
> kvm: disabling virtualization on CPU1
> CPU 1 is now offline
> SMP alternatives: switching to UP code
> CPU0 attaching NULL sched-domain.
> CPU1 attaching NULL sched-domain.
> CPU0 attaching NULL sched-domain.
> mmiotrace: CPU1 is down.
> mmiotrace: enabled.
> in mmio_trace_reset
> mmiotrace: Re-enabling CPUs...
> SMP alternatives: switching to SMP code
> Booting processor 1/1 ip 6000
> Initializing CPU#1
> Calibrating delay using timer specific routine.. <6>7204.76 BogoMIPS (lpj=3602381)
> CPU: L1 I cache: 32K, L1 D cache: 32K
> CPU: L2 cache: 4096K
> CPU: Physical Processor ID: 0
> CPU: Processor Core ID: 1
> x86 PAT enabled: cpu 1, old 0x7040600070406, new 0x7010600070106
> CPU1: Intel(R) Core(TM)2 CPU          6600  @ 2.40GHz stepping 06
> checking TSC synchronization [CPU#0 -> CPU#1]: passed.
> kvm: enabling virtualization on CPU1
> CPU0 attaching NULL sched-domain.
> Switched to high resolution mode on CPU 1
> CPU0 attaching sched-domain:
>  domain 0: span 0-1 level MC
>  groups: 0 1
> CPU1 attaching sched-domain:
>  domain 0: span 0-1 level MC
>  groups: 1 0
> ------------[ cut here ]------------
> Kernel BUG at ffffffff8021a31d [verbose debug info unavailable]
> invalid opcode: 0000 [1] PREEMPT SMP
> CPU 0
> Modules linked in: rfcomm l2cap kvm_intel kvm ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack ip_tables x_tables bridge stp llc acpi_cpufreq freq_table coretemp hwmon
> snd_pcm_oss snd_mixer_oss firewire_sbp2 hci_usb bluetooth arc4 ecb crypto_blkcipher cryptomgr crypto_algapi usbhid zd1211rw mac80211 crypto cfg80211 snd_emu10k1 snd_rawmidi
> snd_ac97_codec ac97_bus sg snd_seq_device snd_hda_intel snd_pcm snd_util_mem snd_timer sr_mod snd_hwdep i2c_i801 ehci_hcd firewire_ohci uhci_hcd snd snd_page_alloc firewire_core
> soundcore r8169 cdrom usbcore i2c_core crc_itu_t
> Pid: 2757, comm: bash Tainted: G       A  2.6.27-rc1-damocles #3
> RIP: 0010:[<ffffffff8021a31d>]  [<ffffffff8021a31d>] __mc_sysdev_add+0xc3/0x1f1
> RSP: 0018:ffff8800b8905ce8  EFLAGS: 00010297
> RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff880080a04000
> RDX: ffffffff8062c680 RSI: 0000000000000003 RDI: ffffffff8059e830
> RBP: ffff8800b8905d48 R08: ffff8800b8904000 R09: ffffffff80229ca4
> R10: ffff8800010247b0 R11: ffff8800bf879de0 R12: 0000000000000018
> R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
> FS:  00007f8ddc78f6e0(0000) GS:ffffffff805da200(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 00007f57cb9b2098 CR3: 00000000b8985000 CR4: 00000000000026e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process bash (pid: 2757, threadinfo ffff8800b8904000, task ffff8800bd125640)
> Stack:  ffffffff80627040 0000000000000000 0000000000000008 ffffffff8048bb28
>  0000000000000003 ffffffff802ce910 ffff8800b8905d28 0000000000000002
>  00000000ffffffe8 0000000000000001 0000000000000001 ffff880001028418
> Call Trace:
>  [<ffffffff802ce910>] ? sysfs_add_file+0xc/0xe
>  [<ffffffff8021a456>] mc_sysdev_add+0xb/0xd
>  [<ffffffff8047baaf>] mc_cpu_callback+0x4b/0x208
>  [<ffffffff8047b772>] ? mce_cpu_callback+0x3e/0xbc
>  [<ffffffff8024b787>] notifier_call_chain+0x33/0x5b
>  [<ffffffff8024b81f>] raw_notifier_call_chain+0xf/0x11
>  [<ffffffff8047e1dc>] _cpu_up+0xce/0x119
>  [<ffffffff8047e285>] cpu_up+0x5e/0x8a
>  [<ffffffff80224967>] disable_mmiotrace+0xfe/0x173
>  [<ffffffff80265279>] mmio_trace_reset+0x2d/0x44
>  [<ffffffff80262c4d>] tracing_set_trace_write+0xd3/0x10f
>  [<ffffffff80289cab>] ? filp_close+0x67/0x72
>  [<ffffffff8028bee3>] vfs_write+0xa7/0xe1
>  [<ffffffff8028bfe1>] sys_write+0x47/0x6f
>  [<ffffffff8020b6db>] system_call_fastpath+0x16/0x1b
> [   68.405002]
> [   68.405002]
> Code: e8 59 80 e8 fd 69 26 00 48 c7 c2 80 c6 62 80 48 8b 05 c0 00 3c 00 48 8b 04 d8 48 8b 48 08 65 8b 04 25 24 00 00 00 44 39 e8 74 04 <0f> 0b eb fe 4c 8d 04 0a 41 c7 84 24 7c 36 64 80 00
> 00 00 00 41
> RIP  [<ffffffff8021a31d>] __mc_sysdev_add+0xc3/0x1f1
>  RSP <ffff8800b8905ce8>
> ---[ end trace ee9c9240024cb48c ]---
>
> I've replaced the originally tainted dmesg with this new clean one, so
> there's no proprietary smell about it :-)

Yes, it's kind of a known issue. Take a look at this explanation:
http://lkml.org/lkml/2008/7/24/260

There were a few related discussions in other threads (mainly, Max
Krasnyansky and I were asking for additional info on possible
requirements from the 'microcode' driver...) heh, I think, we'd be
better off just fixing it one way or another.



-- 
Best regards,
Dmitry Adamushko
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