linux-kernel - [lkp] [pci] 5d7f599a3b: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008

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Date:	Tue, 03 May 2016 09:08:59 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Arnd Bergmann <arnd@...db.de>
CC:	0day robot <fengguang.wu@...el.com>
Subject: [lkp] [pci] 5d7f599a3b: BUG: unable to handle kernel NULL pointer
 dereference at 0000000000000008

FYI, we noticed the following commit:

https://github.com/0day-ci/linux Arnd-Bergmann/pci-add-new-method-for-register-PCI-hosts/20160430-070604
commit 5d7f599a3b4fa1e1bcb10108ad2f728d4117aec1 ("pci: add new method for register PCI hosts")

on test machine: vm-lkp-wsx03-quantal-x86_64: 2 threads qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap with 360M memory

caused below changes:



+------------------------------------------+------------+------------+
|                                          | a84e2b702b | 5d7f599a3b |
+------------------------------------------+------------+------------+
| boot_successes                           | 4          | 0          |
| boot_failures                            | 0          | 3          |
| BUG:unable_to_handle_kernel              | 0          | 3          |
| Oops                                     | 0          | 3          |
| RIP:pci_create_root_bus_msi              | 0          | 3          |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 3          |
| backtrace:acpi_bus_scan                  | 0          | 3          |
| backtrace:acpi_scan_init                 | 0          | 3          |
| backtrace:acpi_init                      | 0          | 3          |
| backtrace:kernel_init_freeable           | 0          | 3          |
+------------------------------------------+------------+------------+



[    1.017131] acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments MSI]
[    1.018786] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM
[    1.020369] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge.
[    1.023216] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[    1.025687] IP: [<ffffffff81510035>] pci_create_root_bus_msi+0xa9/0xd4
[    1.027400] PGD 0 
[    1.028402] Oops: 0002 [#1] SMP 
[    1.029675] Modules linked in:
[    1.030833] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.6.0-rc2-00033-g5d7f599 #1
[    1.033064] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[    1.035492] task: ffff8800139e0000 ti: ffff8800139e8000 task.ti: ffff8800139e8000
[    1.037783] RIP: 0010:[<ffffffff81510035>]  [<ffffffff81510035>] pci_create_root_bus_msi+0xa9/0xd4
[    1.040325] RSP: 0000:ffff8800139ebbd8  EFLAGS: 00010202
[    1.041713] RAX: 0000000000000000 RBX: ffff880012ffc400 RCX: ffff880013b2d3c0
[    1.043368] RDX: ffff880013b2d4e0 RSI: ffff880012ffc6c8 RDI: ffff880012ffc800
[    1.045084] RBP: ffff8800139ebc10 R08: ffff880013b2d558 R09: 0000000000000000
[    1.046799] R10: ffffea00004ecb40 R11: 000000000000ffff R12: ffff880013b2d578
[    1.048447] R13: ffffffff823519e0 R14: 0000000000000000 R15: 0000000000000000
[    1.050213] FS:  0000000000000000(0000) GS:ffff880014b00000(0000) knlGS:0000000000000000
[    1.052748] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    1.054242] CR2: 0000000000000008 CR3: 0000000002206000 CR4: 00000000000006e0
[    1.056014] Stack:
[    1.056932]  ffff880013b2d558 0000000000000000 ffff880013b2d540 ffff880013b29280
[    1.059563]  ffffffff82351900 ffff880013b2d558 ffff880013b2d3c0 ffff8800139ebc20
[    1.062296]  ffffffff81510071 ffff8800139ebc80 ffffffff8153beaa ffff880013b2d740
[    1.065172] Call Trace:
[    1.066875]  [<ffffffff81510071>] pci_create_root_bus+0x11/0x13
[    1.068622]  [<ffffffff8153beaa>] acpi_pci_root_create+0x172/0x1de
[    1.070129]  [<ffffffff81932c57>] pci_acpi_scan_root+0x15b/0x191
[    1.071603]  [<ffffffff8153bb41>] acpi_pci_root_add+0x394/0x46c
[    1.073019]  [<ffffffff81537052>] acpi_bus_attach+0xd4/0x171
[    1.074350]  [<ffffffff815370ac>] acpi_bus_attach+0x12e/0x171
[    1.075646]  [<ffffffff815370ac>] acpi_bus_attach+0x12e/0x171
[    1.077012]  [<ffffffff815371f8>] acpi_bus_scan+0x5c/0x67
[    1.078269]  [<ffffffff8241e77e>] ? acpi_sleep_proc_init+0x28/0x28
[    1.079631]  [<ffffffff8241ec24>] acpi_scan_init+0x5b/0x190
[    1.080913]  [<ffffffff8241e77e>] ? acpi_sleep_proc_init+0x28/0x28
[    1.082334]  [<ffffffff8241e9f2>] acpi_init+0x274/0x291
[    1.083563]  [<ffffffff8100041a>] do_one_initcall+0xfd/0x18f
[    1.084856]  [<ffffffff823d4095>] kernel_init_freeable+0x196/0x21e
[    1.086268]  [<ffffffff81a8178e>] kernel_init+0xe/0xfd
[    1.087491]  [<ffffffff81a8c6e2>] ret_from_fork+0x22/0x50
[    1.088809]  [<ffffffff81a81780>] ? rest_init+0x87/0x87
[    1.090040] Code: 4c 89 88 e8 02 00 00 49 8b 00 49 39 c0 74 27 48 8b 83 c8 02 00 00 49 8b 08 49 8b 50 08 48 89 71 08 48 89 8b c8 02 00 00 48 89 02 <48> 89 50 08 4d 89 00 4d 89 40 08 48 89 df e8 85 fb ff ff 85 c0 
[    1.099281] RIP  [<ffffffff81510035>] pci_create_root_bus_msi+0xa9/0xd4
[    1.100837]  RSP <ffff8800139ebbd8>
[    1.101905] CR2: 0000000000000008
[    1.102903] ---[ end trace 4d306c15f7e3fb5d ]---
[    1.104056] Kernel panic - not syncing: Fatal exception


FYI, raw QEMU command line is:

	qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -kernel /pkg/linux/x86_64-lkp/gcc-4.9/5d7f599a3b4fa1e1bcb10108ad2f728d4117aec1/vmlinuz-4.6.0-rc2-00033-g5d7f599 -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-lkp-wsx03-quantal-x86_64-3/bisect_boot-1-quantal-core-x86_64.cgz-x86_64-lkp-5d7f599a3b4fa1e1bcb10108ad2f728d4117aec1-20160430-100053-yxcns7-1.yaml ARCH=x86_64 kconfig=x86_64-lkp branch=linux-devel/devel-hourly-2016043008 commit=5d7f599a3b4fa1e1bcb10108ad2f728d4117aec1 BOOT_IMAGE=/pkg/linux/x86_64-lkp/gcc-4.9/5d7f599a3b4fa1e1bcb10108ad2f728d4117aec1/vmlinuz-4.6.0-rc2-00033-g5d7f599 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-lkp-wsx03-quantal-x86_64/quantal-core-x86_64.cgz/x86_64-lkp/gcc-4.9/5d7f599a3b4fa1e1bcb10108ad2f728d4117aec1/0 LKP_SERVER=inn earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal rw ip=::::vm-lkp-wsx03-quantal-x86_64-3::dhcp drbd.minor_count=8'  -initrd /fs/sdc1/initrd-vm-lkp-wsx03-quantal-x86_64-3 -m 360 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -pidfile /dev/shm/kboot/pid-vm-lkp-wsx03-quantal-x86_64-3 -serial file:/dev/shm/kboot/serial-vm-lkp-wsx03-quantal-x86_64-3 -daemonize -display none -monitor null 





Thanks,
Kernel Test Robot

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