[Xen-devel] Dom 0 crash

[Ian Murray <murrayie@xxxxxxxxxxx>]

Hi,

I have a recurring crash using Xen 4.3.1-RC2 and Ubuntu 12.04 as Dom0 
(3.2.0-55-generic). I have software RAID 5 with LVM's. DomU (also 12.04 Ubuntu 
3.2.0-55 kernel) has a dedicated logical volume, which is being backed up 
shutting down the DomU, an LVM snapshot being created, restart of DomU and then 
the snapshot dd'ed to another logical volume. The snapshot is then removed and 
the second LV is dd'ed to gzip and onto DAT tape.

I currently have this running every hour (unless its already running) for 
testing purposes. After 6-12 runs of this, the Dom0 kernel crashes with he 
below output.

When I preform this booting into the same kernel standalone, the problem does 
not occur.

Can anyone please suggest what I am doing wrong or identify if it is bug?

Thanks in advance,

Ian.


[24149.786053] general protection fault: 0000 [#1] SMP 
[24149.786070] CPU 0 
[24149.786073] Modules linked in: dm_snapshot xt_physdev iptable_filter 
ip_tables x_tables xen_pciback xen_netback xen_blkback xen_gntalloc xen_gntdev 
xen_evtchn xenfs bridge stp ppdev dm_multipath
snd_hda_codec_realtek nouveau ttm drm_kms_helper drm i2c_algo_bit
edac_core mxm_wmi video k8temp edac_mce_amd serio_raw osst st
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore 
snd_page_alloc i2c_nforce2 parport_pc wmi mac_hid lp parport pata_jmicron 
raid10 raid456 async_pq async_xor xor async_memcpy async_raid6_recov aic7xxx 
forcedeth pata_amd raid6_pq async_tx raid1 raid0 multipath linear 
[24149.786164] 
[24149.786169] Pid: 0, comm: swapper/0 Not tainted 3.2.0-55-generic #85-Ubuntu 
To Be Filled By O.E.M. To Be Filled By O.E.M./939N68PV-GLAN [24149.786181] RIP: 
e030:[<ffffffff8142655d>]  [<ffffffff8142655d>] scsi_dispatch_cmd+0x6d/0x2e0
[24149.786197] RSP: e02b:ffff88001fc03c80  EFLAGS: 00010206
[24149.786202] RAX: 0000000020000000 RBX: ffff880018478000 RCX:
ffff8800184c1f38
[24149.786208] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
ffff880018478000
[24149.786215] RBP: ffff88001fc03cb0 R08: 0000000000000001 R09:
0000000000000000
[24149.786221] R10: 0000000000000028 R11: 0000000000000003 R12:
ffff880003c22800
[24149.786227] R13: 0100000000000800 R14: ffff8800184c12b0 R15:
ffff880018478000
[24149.786238] FS:  00007f02a854d7c0(0000) GS:ffff88001fc00000(0000) 
knlGS:0000000000000000
[24149.786245] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[24149.786250] CR2: 00007f3c3b232000 CR3: 0000000012417000 CR4:
0000000000000660
[24149.786258] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[24149.786264] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[24149.786271] Process swapper/0 (pid: 0, threadinfo ffffffff81c00000, task 
ffffffff81c0d020)
[24149.786278] Stack:
[24149.786281]  ffff88001fc03ca0 ffff880003ead000 ffff880003c22800 
ffff880003d2b368
[24149.786291]  ffff8800184c12b0 ffff880018478000 ffff88001fc03d10 
ffffffff8142da62
[24149.786301]  ffff880003c22828 0000000000000000 ffff880003ead138 
ffff880003ead048
[24149.786311] Call Trace:
[24149.786315]  <IRQ> 
[24149.786323]  [<ffffffff8142da62>] scsi_request_fn+0x3a2/0x470
[24149.786333]  [<ffffffff812f1a28>] blk_run_queue+0x38/0x60
[24149.786339]  [<ffffffff8142c416>] scsi_run_queue+0xd6/0x1b0
[24149.786347]  [<ffffffff8142e822>] scsi_next_command+0x42/0x60
[24149.786354]  [<ffffffff8142ea52>] scsi_io_completion+0x1b2/0x630 
[24149.786363]  [<ffffffff816611fe>] ?
_raw_spin_unlock_irqrestore+0x1e/0x30
[24149.786371]  [<ffffffff81424b5c>] scsi_finish_command+0xcc/0x130 
[24149.786378]  [<ffffffff8142e7ae>] scsi_softirq_done+0x13e/0x150 
[24149.786386]  [<ffffffff812fb6b3>] blk_done_softirq+0x83/0xa0
[24149.786394]  [<ffffffff8106fa38>] __do_softirq+0xa8/0x210
[24149.786402]  [<ffffffff8166ba6c>] call_softirq+0x1c/0x30
[24149.786410]  [<ffffffff810162f5>] do_softirq+0x65/0xa0
[24149.786416]  [<ffffffff8106fe1e>] irq_exit+0x8e/0xb0
[24149.786428]  [<ffffffff813aecd5>] xen_evtchn_do_upcall+0x35/0x50 
[24149.786436]  [<ffffffff8166babe>] xen_do_hypervisor_callback+0x1e/0x30 
[24149.786441]  <EOI> 
[24149.786449]  [<ffffffff810013aa>] ? hypercall_page+0x3aa/0x1000 
[24149.786456]  [<ffffffff810013aa>] ? hypercall_page+0x3aa/0x1000 
[24149.786464]  [<ffffffff8100a500>] ? xen_safe_halt+0x10/0x20
[24149.786472]  [<ffffffff8101c913>] ? default_idle+0x53/0x1d0
[24149.786478]  [<ffffffff81013236>] ? cpu_idle+0xd6/0x120
[24149.786485]  [<ffffffff8162792e>] ? rest_init+0x72/0x74
[24149.786494]  [<ffffffff81cfcc06>] ? start_kernel+0x3b5/0x3c2
[24149.786501]  [<ffffffff81cfc388>] ?
x86_64_start_reservations+0x132/0x136
[24149.786509]  [<ffffffff81cffde8>] ? xen_start_kernel+0x48b/0x492 
[24149.786514] Code: 00 00 0f b6 90 a1 00 00 00 84 d2 74 1e 80 fa 03 7f 19 48 
8b 4f 50 8b 80 84 00 00 00 0f b6 51 01 c1 e0 05 83 e2 1f 09 d0 88 41 01 <41> 8b 
b5 e0 00 00 00 4d 8b a5 e8 00 00 00 85 f6 74 17 48 8b 05 
[24149.786588] RIP  [<ffffffff8142655d>] scsi_dispatch_cmd+0x6d/0x2e0 
[24149.786596]  RSP <ffff88001fc03c80>
[24149.786834] ---[ end trace 706afe7abd423bbf ]---
[24149.786840] Kernel panic - not syncing: Fatal exception in interrupt 
[24149.786847] Pid: 0, comm: swapper/0 Tainted: G      D     
3.2.0-55-generic #85-Ubuntu
[24149.786853] Call Trace:
[24149.786856]  <IRQ>  [<ffffffff8164869c>] panic+0x91/0x1a4
[24149.786868]  [<ffffffff8166239a>] oops_end+0xea/0xf0
[24149.786875]  [<ffffffff810178b8>] die+0x58/0x90
[24149.786882]  [<ffffffff81661ee2>] do_general_protection+0x162/0x170 
[24149.786889]  [<ffffffff81661905>] general_protection+0x25/0x30
[24149.786896]  [<ffffffff8142655d>] ? scsi_dispatch_cmd+0x6d/0x2e0 
[24149.786904]  [<ffffffff8142da62>] scsi_request_fn+0x3a2/0x470
[24149.786911]  [<ffffffff812f1a28>] blk_run_queue+0x38/0x60
[24149.786918]  [<ffffffff8142c416>] scsi_run_queue+0xd6/0x1b0
[24149.786925]  [<ffffffff8142e822>] scsi_next_command+0x42/0x60
[24149.786932]  [<ffffffff8142ea52>] scsi_io_completion+0x1b2/0x630 
[24149.786939]  [<ffffffff816611fe>] ?
_raw_spin_unlock_irqrestore+0x1e/0x30
[24149.786947]  [<ffffffff81424b5c>] scsi_finish_command+0xcc/0x130 
[24149.786954]  [<ffffffff8142e7ae>] scsi_softirq_done+0x13e/0x150 
[24149.786962]  [<ffffffff812fb6b3>] blk_done_softirq+0x83/0xa0
[24149.786968]  [<ffffffff8106fa38>] __do_softirq+0xa8/0x210
[24149.786975]  [<ffffffff8166ba6c>] call_softirq+0x1c/0x30
[24149.786982]  [<ffffffff810162f5>] do_softirq+0x65/0xa0
[24149.786988]  [<ffffffff8106fe1e>] irq_exit+0x8e/0xb0
[24149.786994]  [<ffffffff813aecd5>] xen_evtchn_do_upcall+0x35/0x50 
[24149.787002]  [<ffffffff8166babe>] xen_do_hypervisor_callback+0x1e/0x30 
[24149.787007]  <EOI>  [<ffffffff810013aa>] ? hypercall_page+0x3aa/0x1000 
[24149.787019]  [<ffffffff810013aa>] ? hypercall_page+0x3aa/0x1000 
[24149.787026]  [<ffffffff8100a500>] ? xen_safe_halt+0x10/0x20
[24149.787033]  [<ffffffff8101c913>] ? default_idle+0x53/0x1d0
[24149.787039]  [<ffffffff81013236>] ? cpu_idle+0xd6/0x120
[24149.787045]  [<ffffffff8162792e>] ? rest_init+0x72/0x74
[24149.787052]  [<ffffffff81cfcc06>] ? start_kernel+0x3b5/0x3c2
[24149.787059]  [<ffffffff81cfc388>] ?
x86_64_start_reservations+0x132/0x136
[24149.787067]  [<ffffffff81cffde8>] ? xen_start_kernel+0x48b/0x492 (XEN) 
Domain 0 crashed: rebooting machine in 5 seconds.

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