Virtio_config BUG with 3.18-rc1

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Hi All,

Booting my local KVM guest with a build of 3.18-rc1 this morning, it
hangs during the normal dracut splash screen  When I configured the
guest to use a serial console, I got the output below.  The guest is a
typical KVM guest created with virt-manager, using QXL as the display
driver.  Nothing fancy about it.

I'll try and do a bisect or some other experimentation today, but I
thought I would send this out now in case someone had an idea or was
already aware of it.

josh

[    2.048706] piix4_smbus 0000:00:01.3: SMBus Host Controller at
0xb100, revision 0
[    2.069574] parport_pc 00:04: reported by Plug and Play ACPI
[    2.200079] ------------[ cut here ]------------
[    2.200661] kernel BUG at include/linux/virtio_config.h:125!
[    2.201004] invalid opcode: 0000 [#1] SMP
[    2.201004] Modules linked in: snd_timer snd virtio_balloon
virtio_console serio_raw parport_pc parport i2c_piix4 soundcore
pvpanic btrfs qxl xor raid6_pq drm_kms_helper ttm drm 8139too
virtio_pci virtio_rini
[    2.201004] CPU: 0 PID: 71 Comm: kworker/0:2 Not tainted
3.18.0-0.rc1.git0.1.fc22.x86_64 #1
[    2.201004] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.201004] Workqueue: events control_work_handler [virtio_console]
[    2.201004] task: ffff88003a83f5c0 ti: ffff88003a98c000 task.ti:
ffff88003a98c000
[    2.201004] RIP: 0010:[<ffffffffa0210032>]  [<ffffffffa0210032>]
virtio_device_ready.part.12+0x4/0x6 [virtio_console]
[    2.201004] RSP: 0018:ffff88003a98fd18  EFLAGS: 00010202
[    2.201004] RAX: 0000000000000007 RBX: ffff88003c9b3200 RCX: 0000000000000000
[    2.201004] RDX: 000000000000c192 RSI: ffffffffa02111b7 RDI: 000000000001c192
[    2.201004] RBP: ffff88003a98fd18 R08: ffff88003c9f82b0 R09: 00007f78ee144e90
[    2.201004] R10: 00000000ffffffff R11: 0000000000000246 R12: ffff880036cdd540
[    2.201004] R13: 0000000000000001 R14: ffff880036d1a800 R15: 0000000000000000
[    2.201004] FS:  0000000000000000(0000) GS:ffff88003fc00000(0000)
knlGS:0000000000000000
[    2.201004] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.201004] CR2: 00007f78ee204a50 CR3: 000000003d6f9000 CR4: 00000000000406f0
[    2.201004] Stack:
[    2.201004]  ffff88003a98fd88 ffffffffa020f757 ffff880000000001
ffff8800367ae600
[    2.201004]  ffff88003fc14900 ffff88003a83f628 ffff88003a98fdc8
000000003a0d7984
[    2.201004]  ffff88003a98fd88 ffff88003c831b40 ffff880036cdd584
ffff880036cdd550
[    2.201004] Call Trace:
[    2.201004]  [<ffffffffa020f757>] add_port+0x3b7/0x3e0 [virtio_console]
[    2.201004]  [<ffffffffa020ffdc>] control_work_handler+0x39c/0x3e8
[virtio_console]
[    2.201004]  [<ffffffff810af9e9>] process_one_work+0x149/0x3d0
[    2.201004]  [<ffffffff810b006b>] worker_thread+0x11b/0x490
[    2.201004]  [<ffffffff810aff50>] ? rescuer_thread+0x2e0/0x2e0
[    2.201004]  [<ffffffff810b5218>] kthread+0xd8/0xf0
[    2.201004]  [<ffffffff810b5140>] ? kthread_create_on_node+0x1b0/0x1b0
[    2.201004]  [<ffffffff8174b53c>] ret_from_fork+0x7c/0xb0
[    2.201004]  [<ffffffff810b5140>] ? kthread_create_on_node+0x1b0/0x1b0
[    2.201004] Code: 00 00 48 c7 c2 fc 11 21 a0 48 c7 c7 48 22 21 a0
48 8d 70 10 31 c0 e8 ee 83 19 e1 e9 3e fe ff ff 90 55 48 89 e5 0f 0b
55 48 89 e5 <0f> 0b 55 48 89 e5 0f 0b 55 48 89 e5 e8 5d e1 ff ff 48 c7
c
[    2.201004] RIP  [<ffffffffa0210032>]
virtio_device_ready.part.12+0x4/0x6 [virtio_console]
[    2.201004]  RSP <ffff88003a98fd18>
[    2.232148] ---[ end trace a926e61ef6020bee ]---
[    2.233075] BUG: unable to handle kernel paging request at ffffffffffffffd8
[    2.233944] IP: [<ffffffff810b5850>] kthread_data+0x10/0x20
[    2.234004] PGD 1c17067 PUD 1c19067 PMD 0
[    2.234004] Oops: 0000 [#2] SMP
[    2.234004] Modules linked in: snd_timer snd virtio_balloon
virtio_console serio_raw parport_pc parport i2c_piix4 soundcore
pvpanic btrfs qxl xor raid6_pq drm_kms_helper ttm drm 8139too
virtio_pci virtio_rini
[    2.234004] CPU: 0 PID: 71 Comm: kworker/0:2 Tainted: G      D
  3.18.0-0.rc1.git0.1.fc22.x86_64 #1
[    2.234004] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.234004] task: ffff88003a83f5c0 ti: ffff88003a98c000 task.ti:
ffff88003a98c000
[    2.234004] RIP: 0010:[<ffffffff810b5850>]  [<ffffffff810b5850>]
kthread_data+0x10/0x20
[    2.234004] RSP: 0000:ffff88003a98f968  EFLAGS: 00010096
[    2.234004] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000000f
[    2.234004] RDX: 000000000000000b RSI: 0000000000000000 RDI: ffff88003a83f5c0
[    2.234004] RBP: ffff88003a98f968 R08: ffff88003a83f650 R09: 000000018011000a
[    2.234004] R10: ffffffff813786bb R11: ffffea0000ea6a40 R12: ffff88003fc14880
[    2.234004] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88003a83f5c0
[    2.234004] FS:  0000000000000000(0000) GS:ffff88003fc00000(0000)
knlGS:0000000000000000
[    2.234004] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.234004] CR2: 0000000000000028 CR3: 000000003cb85000 CR4: 00000000000406f0
[    2.234004] Stack:
[    2.234004]  ffff88003a98f988 ffffffff810b0465 ffff88003a98f988
ffff88003a83f5c0
[    2.234004]  ffff88003a98f9f8 ffffffff81747299 ffff88003a83f5c0
0000000000014880
[    2.234004]  ffff88003a98ffd8 0000000000014880 ffff88003a98f9e8
ffff88003a83f5c0
[    2.234004] Call Trace:
[    2.234004]  [<ffffffff810b0465>] wq_worker_sleeping+0x15/0xa0
[    2.234004]  [<ffffffff81747299>] __schedule+0x509/0x7d0
[    2.234004]  [<ffffffff81747589>] schedule+0x29/0x70
[    2.234004]  [<ffffffff81099ab7>] do_exit+0x6e7/0xa60
[    2.234004]  [<ffffffff81740516>] ? printk+0x70/0x86
[    2.234004]  [<ffffffff81017710>] oops_end+0xa0/0xe0
[    2.234004]  [<ffffffff81017bcb>] die+0x4b/0x70
[    2.234004]  [<ffffffff81013f90>] do_trap+0xb0/0x150
[    2.234004]  [<ffffffff810143f6>] do_error_trap+0xa6/0x180
[    2.234004]  [<ffffffffa0210032>] ?
virtio_device_ready.part.12+0x4/0x6 [virtio_console]
[    2.234004]  [<ffffffff81736032>] ? klist_add_tail+0x32/0x40
[    2.234004]  [<ffffffff81495149>] ? device_add+0x219/0x630
[    2.234004]  [<ffffffff81014d10>] do_invalid_op+0x20/0x30
[    2.234004]  [<ffffffff8174cf9e>] invalid_op+0x1e/0x30
[    2.234004]  [<ffffffffa0210032>] ?
virtio_device_ready.part.12+0x4/0x6 [virtio_console]
[    2.234004]  [<ffffffffa0031109>] ? vp_get_status+0x19/0x20 [virtio_pci]
[    2.234004]  [<ffffffffa020f757>] add_port+0x3b7/0x3e0 [virtio_console]
[    2.234004]  [<ffffffffa020ffdc>] control_work_handler+0x39c/0x3e8
[virtio_console]
[    2.234004]  [<ffffffff810af9e9>] process_one_work+0x149/0x3d0
[    2.234004]  [<ffffffff810b006b>] worker_thread+0x11b/0x490
[    2.234004]  [<ffffffff810aff50>] ? rescuer_thread+0x2e0/0x2e0
[    2.234004]  [<ffffffff810b5218>] kthread+0xd8/0xf0
[    2.234004]  [<ffffffff810b5140>] ? kthread_create_on_node+0x1b0/0x1b0
[    2.234004]  [<ffffffff8174b53c>] ret_from_fork+0x7c/0xb0
[    2.234004]  [<ffffffff810b5140>] ? kthread_create_on_node+0x1b0/0x1b0
[    2.234004] Code: 00 48 89 e5 5d 48 8b 40 c8 48 c1 e8 02 83 e0 01
c3 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 48 8b 87 68 04 00 00
55 48 89 e5 <48> 8b 40 d8 5d c3 66 2e 0f 1f 84 00 00 00 00 00 66 66 66
6
[    2.234004] RIP  [<ffffffff810b5850>] kthread_data+0x10/0x20
[    2.234004]  RSP <ffff88003a98f968>
[    2.234004] CR2: ffffffffffffffd8
[    2.234004] ---[ end trace a926e61ef6020bef ]---
[    2.234004] Fixing recursive fault but reboot is needed!
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