While booting a Hyper-V 3.17.0-rc1 guest on a 2012 R2 host a BUG was triggered while registering hyperv_fb which in turn caused a panic. Various kernel debugging options (CONFIG_DEBUG_PAGEALLOC, CONFIG_SLUB_DEBUG=y...) were on at the time. This only seems to happen if the guest is being booted with only one CPU allocated to it. [ 7.549175] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252) [ 7.567501] io scheduler noop registered [ 7.577180] io scheduler deadline registered [ 7.589324] io scheduler cfq registered (default) [ 7.614583] pci_hotplug: PCI Hot Plug PCI Core version: 0.5 [ 7.629146] pciehp: PCI Express Hot Plug Controller Driver version: 0.4 [ 7.645526] hv_vmbus: registering driver hyperv_fb [ 7.657553] BUG: unable to handle kernel paging request at ffff880077800004 [ 7.658224] IP: [<ffffffff8159a7ac>] hv_ringbuffer_write+0x7c/0x150 [ 7.658224] PGD 2da9067 PUD 2dac067 PMD 7fa27067 PTE 8000000077800060 [ 7.658224] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC [ 7.658224] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.17.0-rc1.x86_64 #3 [ 7.658224] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090006 05/23/2012 [ 7.658224] task: ffff88007c070000 ti: ffff88007c06c000 task.ti: ffff88007c06c000 [ 7.658224] RIP: 0010:[<ffffffff8159a7ac>] [<ffffffff8159a7ac>] hv_ringbuffer_write+0x7c/0x150 [ 7.658224] RSP: 0000:ffff88007c06fba0 EFLAGS: 00010092 [ 7.658224] RAX: ffff880077800000 RBX: 0000000000000003 RCX: 000000000003f000 [ 7.658224] RDX: 0000000000000000 RSI: ffffffff825b7640 RDI: ffff88007be6c0a8 [ 7.658224] RBP: ffff88007c06fbe8 R08: 0000000000000000 R09: ffffffff82619f80 [ 7.658224] R10: ffff88007c070000 R11: 0000000000000f40 R12: ffff88007c06fc20 [ 7.658224] R13: ffff88007be6c098 R14: ffff880077fc0000 R15: 0000000000000030 [ 7.658224] FS: 0000000000000000(0000) GS:ffff88007f800000(0000) knlGS:0000000000000000 [ 7.658224] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 7.658224] CR2: ffff880077800004 CR3: 0000000001c0e000 CR4: 00000000000406f0 [ 7.658224] Stack: [ 7.658224] ffff88007c06fc07 0000000000000296 ffff88007be6c0a8 0000000000000000 [ 7.658224] ffff88007be6bf60 0000000000020003 ffff880077fc0400 ffff880077fc0000 [ 7.658224] 0000000000000000 ffff88007c06fc60 ffffffff8159919c ffffffff811a1386 [ 7.658224] Call Trace: [ 7.658224] [<ffffffff8159919c>] vmbus_sendpacket+0x9c/0xc0 [ 7.658224] [<ffffffff811a1386>] ? kfree+0x196/0x1e0 [ 7.658224] [<ffffffff813f3359>] synthvid_negotiate_ver+0x99/0x100 [ 7.658224] [<ffffffff813f37dd>] hvfb_probe+0x19d/0xa10 [ 7.658224] [<ffffffff8122d9bf>] ? sysfs_do_create_link_sd.isra.2+0x6f/0xc0 [ 7.658224] [<ffffffff8159699b>] vmbus_probe+0x3b/0xa0 [ 7.658224] [<ffffffff8146f93d>] driver_probe_device+0x16d/0x380 [ 7.658224] [<ffffffff8146fc0e>] __driver_attach+0x6e/0xa0 [ 7.658224] [<ffffffff8146fba0>] ? __device_attach+0x50/0x50 [ 7.658224] [<ffffffff8146daee>] bus_for_each_dev+0x6e/0xc0 [ 7.658224] [<ffffffff8146fd0e>] driver_attach+0x1e/0x20 [ 7.658224] [<ffffffff8146e5f8>] bus_add_driver+0x128/0x250 [ 7.658224] [<ffffffff81d76bb6>] ? video_setup+0x7f/0x7f [ 7.658224] [<ffffffff81470248>] driver_register+0x98/0xe0 [ 7.658224] [<ffffffff81597567>] __vmbus_driver_register+0x57/0x60 [ 7.658224] [<ffffffff81d76bd2>] hvfb_drv_init+0x1c/0x54 [ 7.658224] [<ffffffff81d3b124>] do_one_initcall+0xf9/0x1a7 [ 7.658224] [<ffffffff81089315>] ? parse_args+0x295/0x430 [ 7.658224] [<ffffffff81d3b3b9>] kernel_init_freeable+0x1e7/0x27b [ 7.658224] [<ffffffff81d3a88d>] ? do_early_param+0x8a/0x8a [ 7.658224] [<ffffffff8167bdf0>] ? rest_init+0xd0/0xd0 [ 7.658224] [<ffffffff8167bdfe>] kernel_init+0xe/0x100 [ 7.658224] [<ffffffff81691b7c>] ret_from_fork+0x7c/0xb0 [ 7.658224] [<ffffffff8167bdf0>] ? rest_init+0xd0/0xd0 [ 7.658224] Code: 41 bf 08 00 00 00 66 0f 1f 84 00 00 00 00 00 49 8d 45 10 48 89 c7 48 89 45 c8 e8 40 66 0f 00 41 8b 4d 48 48 89 45 c0 49 8b 45 00 <8b> 50 04 44 8b 30 89 d0 44 29 f0 01 c1 44 39 f2 0f 46 c1 44 39 [ 7.658224] RIP [<ffffffff8159a7ac>] hv_ringbuffer_write+0x7c/0x150 [ 7.658224] RSP <ffff88007c06fba0> [ 7.658224] CR2: ffff880077800004 [ 7.658224] ---[ end trace a117d5bf96688789 ]--- [ 7.658224] note: swapper/0[1] exited with preempt_count 1 [ 8.433656] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 [ 8.433656] [ 8.434596] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffff9fffffff) [ 8.434596] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 -- Sitsofe | http://sucs.org/~sits/ _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
