Re: [Xen-devel] xen.git pvops kernel bug: i915 bug after memory upgrade

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Feb 10, 2010 at 10:44:59PM +1100, Yasir Assam wrote:
> I upgraded my RAM from 2GB to 8GB today, and I'm no longer able to run  
> X. My guess is this is a bug in the xen.git kernel (the dom0 kernel) in  
> the i915 module. Other kernels (vanilla 2.6.32.x) work fine.
>
> I have attached the full dmesg log. The problem is completely  
> reproducible on my machine.

1) Can you give me the hardware specs?

.. snip ..
> [   23.261678] BUG: unable to handle kernel paging request at ffffc900000c6000
> [   23.261685] IP: [<ffffffffa0015226>] intel_i915_chipset_flush+0x22/0x3e 
> [intel_agp]
> [   23.261694] PGD 33d2067 PUD 33d3067 PMD 33d4067 PTE 0
> [   23.261700] Oops: 0002 [#1] SMP 
> [   23.261703] last sysfs file: /sys/module/i2c_core/initstate
> [   23.261705] CPU 0 
> [   23.261707] Modules linked in: i915(+) drm i2c_algo_bit video output ppdev 
> lp parport sco bnep rfcomm l2cap bluetooth rfkill battery cpufreq_stats 
> cpufreq_userspace cpufreq_conservative cpufreq_powersave fuse hwmon_vid 
> k8temp eeprom i2c_nforce2 firewire_sbp2 firewire_core crc_itu_t loop 
> snd_hda_codec_intelhdmi 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 
> processor snd_seq_midi_event evdev pcspkr i2c_i801 i2c_core asus_atk0110 
> snd_seq snd_timer button snd_seq_device acpi_processor snd soundcore 
> snd_page_alloc ext3 jbd mbcache dm_mod raid1 md_mod sg sd_mod crc_t10dif 
> sr_mod cdrom usbhid hid pata_jmicron ata_generic ata_piix libata scsi_mod 
> ide_pci_generic ehci_hcd r8169 mii ide_core usbcore nls_base intel_agp 
> thermal fan thermal_sys [last unloaded: scsi_wait_scan]
> [   23.261775] Pid: 2379, comm: modprobe Not tainted 2.6.31.6-pvops-dom0 #7 
> System Product Name
> [   23.261777] RIP: e030:[<ffffffffa0015226>]  [<ffffffffa0015226>] 
> intel_i915_chipset_flush+0x22/0x3e [intel_agp]

Can you dissassemble the instructions around this to see what it is
doing?

Look here on how to do it:
http://lists.xensource.com/archives/html/xen-devel/2009-10/msg00008.html
> [   23.261783] RSP: e02b:ffff880002155a58  EFLAGS: 00010286
> [   23.261785] RAX: 0000000000000001 RBX: ffff88001e0f7300 RCX: 
> 0000000000001000
> [   23.261787] RDX: ffffc900000c6000 RSI: 00000000000007e9 RDI: 
> ffff88001d5efe00
> [   23.261789] RBP: ffff88001e96c000 R08: 0000000000000040 R09: 
> ffff8800016f1000
> [   23.261792] R10: ffff880000000000 R11: 6db6db6db6db6db7 R12: 
> 0000000000000001
> [   23.261794] R13: 00000000007e9000 R14: ffff88001e0f7f00 R15: 
> 00000000007e9000
> [   23.261799] FS:  00007f1a00ddd6f0(0000) GS:ffffc90000000000(0000) 
> knlGS:0000000000000000
> [   23.261801] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
> [   23.261803] CR2: ffffc900000c6000 CR3: 000000001dd65000 CR4: 
> 0000000000002660
> [   23.261806] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
> 0000000000000000
> [   23.261808] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 
> 0000000000000400
> [   23.261811] Process modprobe (pid: 2379, threadinfo ffff880002154000, task 
> ffff8800198b8000)
> [   23.261812] Stack:
> [   23.261814]  0000000d00000000 000000007ea42086 000000007ea42086 
> ffffffffa03c387c
> [   23.261818] <0> ffff88001e0f7f00 000000007ea42086 ffff88001e96c000 
> ffff88001e0f7300
> [   23.261823] <0> ffff88001e0f7f00 ffffffffa03c4fc3 ffff88001e0f7300 
> 0000000000000000
> [   23.261828] Call Trace:
> [   23.261840]  [<ffffffffa03c387c>] ? 
> i915_gem_object_flush_cpu_write_domain+0x30/0x53 [i915]
> [   23.261849]  [<ffffffffa03c4fc3>] ? 
> i915_gem_object_set_to_gtt_domain+0x57/0x9d [i915]
> [   23.261860]  [<ffffffffa03d909a>] ? intelfb_create+0x1e5/0x7a3 [i915]
> [   23.261866]  [<ffffffff81033525>] ? xen_force_evtchn_callback+0x1d/0x37
> [   23.261877]  [<ffffffffa03d9a1e>] ? intelfb_probe+0x3c6/0x62e [i915]
> [   23.261881]  [<ffffffff8103400f>] ? xen_restore_fl_direct_end+0x0/0x1
> [   23.261894]  [<ffffffffa039d239>] ? drm_helper_initial_config+0x176/0x19c 
> [drm]
> [   23.261902]  [<ffffffffa03be2e7>] ? i915_driver_load+0xaa7/0xb3c [i915]
> [   23.261913]  [<ffffffffa0393399>] ? drm_get_dev+0x321/0x444 [drm]
> [   23.261919]  [<ffffffff811fc04b>] ? local_pci_probe+0x22/0x3e
> [   23.261922]  [<ffffffff81033525>] ? xen_force_evtchn_callback+0x1d/0x37
> [   23.261925]  [<ffffffff811fd30e>] ? pci_device_probe+0x68/0xab
> [   23.261930]  [<ffffffff81299c91>] ? driver_probe_device+0xa2/0x13a
> [   23.261933]  [<ffffffff8103400f>] ? xen_restore_fl_direct_end+0x0/0x1
> [   23.261936]  [<ffffffff81299d8c>] ? __driver_attach+0x63/0x9a
> [   23.261939]  [<ffffffff81299d29>] ? __driver_attach+0x0/0x9a
> [   23.261942]  [<ffffffff812990ab>] ? bus_for_each_dev+0x54/0x9d
> [   23.261945]  [<ffffffff81299674>] ? bus_add_driver+0xbc/0x218
> [   23.261948]  [<ffffffff8129a185>] ? driver_register+0xa3/0x122
> [   23.261951]  [<ffffffff811fd5b6>] ? __pci_register_driver+0x5e/0xe7
> [   23.261959]  [<ffffffffa0383000>] ? i915_init+0x0/0x74 [i915]
> [   23.261962]  [<ffffffff8100a0f5>] ? do_one_initcall+0x77/0x1c1
> [   23.261966]  [<ffffffff810ae08f>] ? sys_init_module+0xda/0x223
> [   23.261970]  [<ffffffff81038fc2>] ? system_call_fastpath+0x16/0x1b
> [   23.261972] Code: 86 51 06 e1 48 83 c4 18 c3 48 83 ec 18 48 8b 15 f1 80 00 
> 00 65 48 8b 04 25 28 00 00 00 48 89 44 24 10 31 c0 48 85 d2 74 04 b0 01 <89> 
> 02 48 8b 44 24 10 65 48 33 04 25 28 00 00 00 74 05 e8 48 51 
> [   23.262012] RIP  [<ffffffffa0015226>] intel_i915_chipset_flush+0x22/0x3e 
> [intel_agp]
> [   23.262017]  RSP <ffff880002155a58>
> [   23.262019] CR2: ffffc900000c6000
> [   23.262022] ---[ end trace cf5e2ee5497e2d52 ]---
> [   26.955198] eth0: no IPv6 routers present
> [   27.230515] peth0: no IPv6 routers present

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