FYI, we noticed the below changes on git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost-next commit 38ada4d7c6b416b2c41e67b721ebcfeec89e4751 ("pci: disable msi/msix at probe time") +------------------------------------------+------------+------------+ | | 91435d5741 | 38ada4d7c6 | +------------------------------------------+------------+------------+ | boot_successes | 30 | 0 | | early-boot-hang | 1 | | | boot_failures | 0 | 29 | | BUG:unable_to_handle_kernel | 0 | 9 | | Oops | 0 | 9 | | RIP:pci_bus_read_config_word | 0 | 29 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 29 | | backtrace:__pci_register_driver | 0 | 29 | | backtrace:piix_init | 0 | 9 | | backtrace:kernel_init_freeable | 0 | 29 | | general_protection_fault | 0 | 20 | | backtrace:virtio_pci_driver_init | 0 | 20 | +------------------------------------------+------------+------------+ [ 0.863966] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0 [ 0.867094] ACPI: Power Button [PWRF] [ 0.868900] GHES: HEST is not enabled! [ 0.870151] general protection fault: 0000 [#1] SMP [ 0.872006] Modules linked in: [ 0.872691] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.0.0-rc4-wl-00283-g3303cfa #2 [ 0.872691] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014 [ 0.872691] task: ffff8800135d0000 ti: ffff8800135cc000 task.ti: ffff8800135cc000 [ 0.872691] RIP: 0010:[] [] pci_bus_read_config_word+0x5b/0x88 [ 0.872691] RSP: 0000:ffff8800135cfc08 EFLAGS: 00010046 [ 0.872691] RAX: 005352435f003030 RBX: ffff8800123450e0 RCX: 0000000000000002 [ 0.872691] RDX: 0000000000000006 RSI: 00000000822cdd50 RDI: ffff8800123450e0 [ 0.872691] RBP: ffff8800135cfc48 R08: ffff8800135cfc14 R09: 0000000000000720 [ 0.872691] R10: ffffea00004da600 R11: ffffffff81ee3381 R12: ffff8800135cfc66 [ 0.872691] R13: 0000000000000246 R14: 00000000822cdd50 R15: 0000000000000006 [ 0.872691] FS: 0000000000000000(0000) GS:ffff880013800000(0000) knlGS:0000000000000000 [ 0.872691] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.872691] CR2: 0000000000000000 CR3: 000000000220b000 CR4: 00000000000406f0 [ 0.872691] Stack: [ 0.872691] ffff8800135cfc38 0000000081570ccf ffff8800135d0000 0000000000000000 [ 0.872691] 0000000000000005 ffff8800135cfd20 ffffffff822c35c0 0000000000000000 [ 0.872691] ffff8800135cfc78 ffffffff814db1a6 ffff8800135cfc78 0000000000000246 [ 0.872691] Call Trace: [ 0.872691] [] __pci_bus_find_cap_start+0x1e/0x44 [ 0.872691] [] pci_find_capability+0x26/0x4e [ 0.872691] [] pci_msi_off+0x1d/0xa3 [ 0.872691] [] local_pci_probe+0x3c/0x8d [ 0.872691] [] pci_device_probe+0xd4/0xfa [ 0.872691] [] driver_probe_device+0x128/0x307 [ 0.872691] [] __driver_attach+0x5e/0x81 [ 0.872691] [] ? __device_attach+0x3d/0x3d [ 0.872691] [] bus_for_each_dev+0x6d/0x87 [ 0.872691] [] driver_attach+0x1e/0x20 [ 0.872691] [] bus_add_driver+0x131/0x1f0 [ 0.872691] [] ? virtio_mmio_init+0x14/0x14 [ 0.872691] [] driver_register+0x8f/0xcc [ 0.872691] [] ? virtio_mmio_init+0x14/0x14 [ 0.872691] [] __pci_register_driver+0x4c/0x4e [ 0.872691] [] virtio_pci_driver_init+0x19/0x1b [ 0.872691] [] do_one_initcall+0xfd/0x18f [ 0.872691] [] kernel_init_freeable+0x1b7/0x23f [ 0.872691] [] ? rest_init+0x87/0x87 [ 0.872691] [] kernel_init+0xe/0xdf [ 0.872691] [] ret_from_fork+0x58/0x90 [ 0.872691] [] ? rest_init+0x87/0x87 [ 0.872691] Code: 82 49 89 cc 41 89 d7 41 89 f6 e8 04 4c 54 00 49 89 c5 48 8b 83 b8 00 00 00 48 89 df 4c 8d 45 cc b9 02 00 00 00 44 89 fa 44 89 f6 50 08 89 c3 8b 45 cc 4c 89 ee 48 c7 c7 80 92 66 82 66 41 89 [ 0.872691] RIP [] pci_bus_read_config_word+0x5b/0x88 [ 0.872691] RSP [ 0.872691] ---[ end trace 9c6616ef4221cb81 ]--- [ 0.872691] Kernel panic - not syncing: Fatal exception Thanks, Ying Huang