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Subject[BUG][linux-next] NULL pointer dereference in acpiphp_enumerate_slots
I tested out linux-next yesterday and it crashed on boot up with:

BUG: unable to handle kernel NULL pointer dereference at 0000000000000040^M
IP: [<ffffffff81274ccc>] acpiphp_enumerate_slots+0xb9/0x195
PGD 0
Oops: 0002 [#1] PREEMPT SMP
Modules linked in:^M
CPU: 2 PID: 1 Comm: swapper/0 Not tainted 3.14.0-rc1-test+ #179^M
Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./To be filled by O.E.M., BIOS SDBLI944.86P 05/08/2007
task: ffff88007abbd3d0 ti: ffff88007abbe000 task.ti: ffff88007abbe000^M
RIP: 0010:[<ffffffff81274ccc>] [<ffffffff81274ccc>] acpiphp_enumerate_slots+0xb9/0x195^M
RSP: 0000:ffff88007abbfa18 EFLAGS: 00010292^M
RAX: 0000000000000000 RBX: ffff880079b5bc80 RCX: ffff880079b5bc80^M
RDX: ffff88007d500000 RSI: 0000000000000000 RDI: ffffffff814f1143^M
RBP: ffff88007a8228d0 R08: ffff880079b5bc80 R09: 0000000000000002^M
R10: ffff88007abbd3d0 R11: ffff880079b5bc80 R12: ffff880079c05118^M
R13: ffff8800798c6000 R14: ffff880079aae000 R15: 0000000000000000^M
FS: 0000000000000000(0000) GS:ffff88007d500000(0000) knlGS:0000000000000000^M
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000040 CR3: 0000000001a0b000 CR4: 00000000000007e0^M
Stack:^M
0000000000000000 0000000000000246 ffff880079c05000 ffff880079c05000
ffff880079c05800 ffff880079aae000 ffff880079c05118 ffffffff814e3080
ffff880079b59818 00023c1181261011 ffff880079b59800 0000000000000000
Call Trace:^M
[<ffffffff814e3080>] ? pci_add_new_bus+0x284/0x2be^M
[<ffffffff8125ea53>] ? pci_scan_bridge+0x195/0x507^M
[<ffffffff8125db95>] ? pci_read_bridge_bases+0x2b6/0x39e^M
[<ffffffff8125ee8b>] ? pci_scan_child_bus+0xc6/0x10f^M
[<ffffffff8125ea8a>] ? pci_scan_bridge+0x1cc/0x507
[<ffffffff814e2d98>] ? pci_scan_single_device+0x41/0xa5
[<ffffffff8125ee8b>] ? pci_scan_child_bus+0xc6/0x10f^M
[<ffffffff81403b9c>] ? pci_acpi_scan_root+0x3a6/0x429^M
[<ffffffff812963fd>] ? acpi_pci_root_add+0x2f9/0x3d4^M
[<ffffffff81292b0c>] ? acpi_bus_attach+0xa3/0x129^M
[<ffffffff81292b59>] ? acpi_bus_attach+0xf0/0x129
[<ffffffff81292b59>] ? acpi_bus_attach+0xf0/0x129^M
[<ffffffff81292bf0>] ? acpi_bus_scan+0x5e/0x67
[<ffffffff81b31e8f>] ? acpi_sleep_proc_init+0x29/0x29^M
[<ffffffff81b32291>] ? acpi_scan_init+0x5b/0x186^M
[<ffffffff81b31e8f>] ? acpi_sleep_proc_init+0x29/0x29^M
[<ffffffff81b31e8f>] ? acpi_sleep_proc_init+0x29/0x29
[<ffffffff81b32093>] ? acpi_init+0x204/0x269^M
[<ffffffff810002ae>] ? do_one_initcall+0x9d/0x123^M
[<ffffffff81057dc6>] ? parse_args+0x21f/0x30d
[<ffffffff81af8eb2>] ? kernel_init_freeable+0x179/0x20a^M
[<ffffffff81af86e6>] ? do_early_param+0x7d/0x7d
[<ffffffff814f51b2>] ? preempt_count_sub+0xba/0xc6
[<ffffffff814e07cd>] ? rest_init+0x81/0x81
[<ffffffff814e07d8>] ? kernel_init+0xb/0x106^M
[<ffffffff814f822c>] ? ret_from_fork+0x7c/0xb0
[<ffffffff814e07cd>] ? rest_init+0x81/0x81^M
Code: 38 49 81 c4 18 01 00 00 48 89 43 40 4c 89 e7 e8 90 43 08 00 48 8b 43 38 48 83 78 10 00 74 52 e8 17 cd 01 00 49 8b 85 e0 01 00 00 <ff> 40 40 48 85 c0 75 28 e8 17 cd 01 00 4c 89 e7 e8 93 43 08 00 ^M
RIP [<ffffffff81274ccc>] acpiphp_enumerate_slots+0xb9/0x195
RSP <ffff88007abbfa18>^M
CR2: 0000000000000040



I set up ktest to perform a bisect it it ended with this commit:

commit d95c405afec934e0c0c46d434b3b62b51c880fe9
Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Date: Tue Feb 4 00:43:26 2014 +0100

ACPI / hotplug / PCI: Consolidate ACPIPHP with ACPI core hotplug


Attached is my config.

-- Steve
[unhandled content-type:application/octet-stream]
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