[BUG bisected]: apei_hest_parse explosion

[Thomas Gleixner]

Just booted linus head on one of my old kvm based testing systems and
got the following splat:

[    0.531910] BUG: unable to handle kernel NULL pointer dereference at 0000000000000024
[    0.532173] IP: [<ffffffff812f1bd2>] apei_hest_parse+0xd2/0xf0
[    0.532173] PGD 0 
[    0.532173] Oops: 0000 [#1] PREEMPT SMP 
[    0.532173] Modules linked in:
[    0.532173] CPU 3 
[    0.532173] Pid: 1, comm: swapper/0 Not tainted 3.8.0+ #195 Bochs Bochs
[    0.532173] RIP: 0010:[<ffffffff812f1bd2>]  [<ffffffff812f1bd2>] apei_hest_parse+0xd2/0xf0
[    0.532173] RSP: 0000:ffff88021685be78  EFLAGS: 00010206
[    0.532173] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[    0.532173] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000028
[    0.532173] RBP: ffff88021685be98 R08: 00000000804efb06 R09: 0000000000000000
[    0.532173] R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff81af3d40
[    0.532173] R13: ffffffff812bcb23 R14: 0000000000000000 R15: 0000000000000000
[    0.532173] FS:  0000000000000000(0000) GS:ffff88021fcc0000(0000) knlGS:0000000000000000
[    0.532173] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.532173] CR2: 0000000000000024 CR3: 0000000001a0c000 CR4: 00000000000406a0
[    0.532173] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    0.532173] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[    0.532173] Process swapper/0 (pid: 1, threadinfo ffff88021685a000, task ffff8802168c0000)
[    0.532173] Stack:
[    0.532173]  00000000fffffffa ffffffff81af3d40 0000000000000000 000000001fb3f55a
[    0.532173]  ffff88021685bea8 ffffffff812bcbe4 ffff88021685bec8 ffffffff81af3d5c
[    0.532173]  0000000000000030 0000000000000030 ffff88021685bef8 ffffffff8100023b
[    0.532173] Call Trace:
[    0.532173]  [<ffffffff81af3d40>] ? pcie_portdrv_init+0x7a/0x7a
[    0.532173]  [<ffffffff812bcbe4>] aer_acpi_firmware_first+0x20/0x30
[    0.532173]  [<ffffffff81af3d5c>] aer_service_init+0x1c/0x35
[    0.532173]  [<ffffffff8100023b>] do_one_initcall+0x57/0x13c
[    0.532173]  [<ffffffff81ad2d39>] kernel_init_freeable+0x142/0x1d1
[    0.532173]  [<ffffffff81ad254f>] ? loglevel+0x31/0x31
[    0.532173]  [<ffffffff815a8cef>] ? rest_init+0xc3/0xc3
[    0.532173]  [<ffffffff815a8cfd>] kernel_init+0xe/0xd6
[    0.532173]  [<ffffffff815bc73c>] ret_from_fork+0x7c/0xb0
[    0.532173]  [<ffffffff815a8cef>] ? rest_init+0xc3/0xc3
[    0.532173] Code: 14 0f b7 77 02 31 c0 48 c7 c7 65 c1 83 81 e8 35 1a 2c 00 eb 23 4c 89 f6 41 ff d5 85 c0 75 1e 4c 89 e7 ff c3 48 8b 05 a6 5b 7c 00 <3b> 58 24 0f 82 5a ff ff ff 31 c0 eb 05 b8 ea ff ff ff 5b 41 5c 

git bisect identified the following commit:

commit 92ef2a25c763338905dce8344a0584606f842920
Author: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Date:   Fri Dec 21 00:36:40 2012 +0100

    ACPI: Change the ordering of PCI root bridge driver registrarion

A revert is impossible w/o major surgery, so I'm going to bed and let
the involved folks think about it.

Thanks,

	tglx
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