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Date: Fri, 28 Mar 2014 15:58:51 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Liviu Dudau <Liviu.Dudau@....com>
Cc: Rob Herring <robh@...nel.org>, linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [pci] BUG: unable to handle kernel NULL pointer dereference at
00000000000000c8
Greetings,
I got the below dmesg and the first bad commit is
git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux versatile
commit 003b5e6f33242288b3da627ac8a9fffdc61067a0
Author: Liviu Dudau <Liviu.Dudau@....com>
AuthorDate: Fri Mar 14 15:34:29 2014 +0000
Commit: Rob Herring <robh@...nel.org>
CommitDate: Thu Mar 27 17:00:57 2014 -0500
pci: Create pci_host_bridge before its associated bus in pci_create_root_bus.
Before commit 7b5436635800 the pci_host_bridge was created before the root bus.
As that commit has added a needless dependency on the bus for pci_alloc_host_bridge()
the creation order has been changed for no good reason. Revert the order of
creation as we are going to depend on the pci_host_bridge structure to retrieve the
domain number of the root bus.
Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
Acked-by: Grant Likely <grant.likely@...aro.org>
Tested-by: Tanmay Inamdar <tinamdar@....com>
+-----------------------------------------------------------+------------+------------+
| | 003b5e6f33 | eef38aacf6 |
+-----------------------------------------------------------+------------+------------+
| boot_successes | 0 | 0 |
| boot_failures | 20 | 19 |
| BUG:unable_to_handle_kernel_NULL_pointer_dereference | 20 | 19 |
| Oops:SMP | 20 | 19 |
| RIP:pcibios_root_bridge_prepare | 20 | 19 |
| Kernel_panic-not_syncing:Attempted_to_kill_init_exitcode= | 20 | 19 |
| backtrace:acpi_bus_scan | 20 | 19 |
| backtrace:acpi_scan_init | 20 | 19 |
| backtrace:acpi_init | 20 | 19 |
| backtrace:kernel_init_freeable | 20 | 19 |
+-----------------------------------------------------------+------------+------------+
[ 0.886041] acpi PNP0A03:00: _OSC: OS supports [Segments MSI]
[ 0.888121] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM
[ 0.895383] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge.
[ 0.896026] BUG: unable to handle kernel NULL pointer dereference at 00000000000000c8
[ 0.897000] IP: [<ffffffff819a9387>] pcibios_root_bridge_prepare+0x11/0x26
[ 0.897000] PGD 0
[ 0.897000] Oops: 0000 [#1] SMP
[ 0.897000] Modules linked in:
[ 0.897000] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.14.0-rc2-00030-g003b5e6 #712
[ 0.897000] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 0.897000] task: ffff88001e6c8000 ti: ffff88001e6c4000 task.ti: ffff88001e6c4000
[ 0.897000] RIP: 0010:[<ffffffff819a9387>] [<ffffffff819a9387>] pcibios_root_bridge_prepare+0x11/0x26
[ 0.897000] RSP: 0000:ffff88001e6c5c00 EFLAGS: 00010282
[ 0.897000] RAX: 0000000000000000 RBX: ffff88001de68ee8 RCX: 0000000000000000
[ 0.897000] RDX: 0000000000000498 RSI: ffff88001e6c87f0 RDI: ffff88001dfe5cd0
[ 0.897000] RBP: ffff88001e6c5c90 R08: 00000000b0fa9e28 R09: 0000000000000001
[ 0.897000] R10: 000000000000a1e0 R11: 0000000000000000 R12: ffff88001dfe5cd0
[ 0.897000] R13: ffff88001de68f18 R14: 0000000000000000 R15: ffffffff821b1270
[ 0.897000] FS: 0000000000000000(0000) GS:ffff88001ea00000(0000) knlGS:0000000000000000
[ 0.897000] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 0.897000] CR2: 00000000000000c8 CR3: 00000000020ae000 CR4: 00000000000006f0
[ 0.897000] Stack:
[ 0.897000] ffffffff814b15dc ffff88001dfe6148 ffff88001e428000 ffff88001e6c5cc8
[ 0.897000] 0000000000000000 ffff88001e6c5c90 ffffffff815f10ea ffffffff82026a3d
[ 0.897000] ffff88001e6c5c48 ffff880000000010 ffff88001e6c5ca0 ffff88001e6c5c60
[ 0.897000] Call Trace:
[ 0.897000] [<ffffffff814b15dc>] ? pci_create_root_bus+0x7e/0x31e
[ 0.897000] [<ffffffff815f10ea>] ? dev_warn+0x5c/0x5e
[ 0.897000] [<ffffffff819a82be>] ? pci_mmconfig_insert+0xb2/0x1d0
[ 0.897000] [<ffffffff819a92d8>] pci_acpi_scan_root+0x30c/0x3aa
[ 0.897000] [<ffffffff814e0db9>] acpi_pci_root_add+0x25b/0x32f
[ 0.897000] [<ffffffff814dd3c9>] acpi_bus_attach+0x85/0xf4
[ 0.897000] [<ffffffff814dd425>] acpi_bus_attach+0xe1/0xf4
[ 0.897000] [<ffffffff814dd425>] acpi_bus_attach+0xe1/0xf4
[ 0.897000] [<ffffffff814dd493>] acpi_bus_scan+0x5b/0x6b
[ 0.897000] [<ffffffff82412c02>] ? acpi_sleep_proc_init+0x2a/0x2a
[ 0.897000] [<ffffffff82412ff2>] acpi_scan_init+0x60/0x18e
[ 0.897000] [<ffffffff82412c02>] ? acpi_sleep_proc_init+0x2a/0x2a
[ 0.897000] [<ffffffff82412e41>] acpi_init+0x23f/0x257
[ 0.897000] [<ffffffff810002b2>] do_one_initcall+0x84/0x11a
[ 0.897000] [<ffffffff81094152>] ? parse_args+0x189/0x249
[ 0.897000] [<ffffffff823cdf75>] kernel_init_freeable+0x1d8/0x25d
[ 0.897000] [<ffffffff823cd759>] ? do_early_param+0x88/0x88
[ 0.897000] [<ffffffff81ae8469>] ? rest_init+0xcd/0xcd
[ 0.897000] [<ffffffff81ae8477>] kernel_init+0xe/0xda
[ 0.897000] [<ffffffff81b0f83c>] ret_from_fork+0x7c/0xb0
[ 0.897000] [<ffffffff81ae8469>] ? rest_init+0xcd/0xcd
[ 0.897000] Code: 71 b0 ff 48 8b 1b eb ee 48 83 c4 38 4c 89 e8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 1f 44 00 00 48 8b 87 70 04 00 00 55 48 89 e5 5d <48> 8b 80 c8 00 00 00 48 8b 40 08 48 89 87 c0 03 00 00 31 c0 c3
[ 0.897000] RIP [<ffffffff819a9387>] pcibios_root_bridge_prepare+0x11/0x26
[ 0.897000] RSP <ffff88001e6c5c00>
[ 0.897000] CR2: 00000000000000c8
[ 0.897000] ---[ end trace 6110a1dd1810ff29 ]---
[ 0.897033] swapper/0 (1) used greatest stack depth: 3816 bytes left
git bisect start eef38aacf67aae8b10c07c8b55b3f0fee627c8fa a79528e9d849803457b6235ddb1a1cfd4e11c6cd --
git bisect good f22b3e5788b29311219620adeb3edac565881241 # 09:02 20+ 0 dts: versatile: add pci controller binding
git bisect bad 36623599ba01b3aba32c615a210ce50e195204fa # 09:04 0- 20 pci: Export find_pci_host_bridge() function.
git bisect good d5bb25094600d096be062f823109753c6b218400 # 09:12 20+ 0 pci: OF: Fix the conversion of IO ranges into IO resources.
git bisect bad 003b5e6f33242288b3da627ac8a9fffdc61067a0 # 09:19 0- 7 pci: Create pci_host_bridge before its associated bus in pci_create_root_bus.
# first bad commit: [003b5e6f33242288b3da627ac8a9fffdc61067a0] pci: Create pci_host_bridge before its associated bus in pci_create_root_bus.
git bisect good d5bb25094600d096be062f823109753c6b218400 # 09:26 60+ 0 pci: OF: Fix the conversion of IO ranges into IO resources.
git bisect bad eef38aacf67aae8b10c07c8b55b3f0fee627c8fa # 09:26 0- 19 ARM: versatile: register sched_clock directly
git bisect good f217c44ebd41ce7369d2df07622b2839479183b0 # 09:33 60+ 0 Merge tag 'trace-fixes-v3.14-rc7-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
git bisect good 9eee0105595d9d1f3702d0e8d8cf4950e400ed0b # 09:41 60+ 0 Add linux-next specific files for 20140327
This script may reproduce the error.
-----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
kvm=(
qemu-system-x86_64 -cpu kvm64 -enable-kvm
-kernel $kernel
-smp 2
-m 256M
-net nic,vlan=0,macaddr=00:00:00:00:00:00,model=virtio
-net user,vlan=0
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-serial stdio
-display none
-monitor null
)
append=(
debug
sched_debug
apic=debug
ignore_loglevel
sysrq_always_enabled
panic=10
prompt_ramdisk=0
earlyprintk=ttyS0,115200
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
)
"${kvm[@]}" --append "${append[*]}"
-----------------------------------------------------------------------------
Thanks,
Fengguang
View attachment "dmesg-nfsroot-athens-23:20140328091949:x86_64-nfsroot:3.14.0-rc2-00030-g003b5e6:712" of type "text/plain" (41773 bytes)
Download attachment "x86_64-nfsroot-eef38aacf67aae8b10c07c8b55b3f0fee627c8fa-BUG:-unable-to-handle-kernel-NULL-pointer-dereference-50590.log" of type "application/octet-stream" (26651 bytes)
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