linux-kernel - Re: [PATCH 0/4] x86: FPU detection in C

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Date:	Wed, 10 Apr 2013 13:08:40 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH 0/4] x86: FPU detection in C


I think this series broke FPU emulation, crashing in early boot:

[    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
[    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
[    0.000000] __ex_table already sorted, skipping sort
[    0.000000] Initializing CPU#0
[    0.000000] BUG: unable to handle kernel NULL pointer dereference at   (null)
[    0.000000] IP: [<b10fa063>] kmem_cache_alloc+0x13/0x130
[    0.000000] *pde = 00000000 
[    0.000000] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[    0.000000] Modules linked in:
[    0.000000] Pid: 0, comm: swapper Not tainted 3.9.0-rc6+ #221907  
[    0.000000] EIP: 0060:[<b10fa063>] EFLAGS: 00210046 CPU: 0
[    0.000000] EIP is at kmem_cache_alloc+0x13/0x130
[    0.000000] EAX: 00000000 EBX: b156dfa0 ECX: 0000007b EDX: 000000d0
[    0.000000] ESI: effd09c0 EDI: 00000000 EBP: b1563ea4 ESP: b1563e78
[    0.000000]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[    0.000000] CR0: 80050037 CR2: 00000000 CR3: 015fa000 CR4: 00000690
[    0.000000] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[    0.000000] DR6: ffff0ff0 DR7: 00000400
[    0.000000] Process swapper (pid: 0, ti=b1562000 task=b156dfa0 task.ti=b1562000)
[    0.000000] Stack:
[    0.000000]  3b9aca00 00000000 b1563e8c b11cfb0c 000000d0 b1563eb8 b10277d2 b1706040
[    0.000000]  b156dfa0 effd09c0 b13ed7a0 b1563eb0 b1008827 b1563f44 b1563f3c b132fa45
[    0.000000]  b1563ed8 b1027c80 00000000 00000000 b1706062 00000001 b1563ee0 00200046
[    0.000000] Call Trace:
[    0.000000]  [<b11cfb0c>] ? sprintf+0x1c/0x20
[    0.000000]  [<b10277d2>] ? print_time.part.5+0x82/0xc0
[    0.000000]  [<b13ed7a0>] ? do_debug+0x150/0x150
[    0.000000]  [<b1008827>] init_fpu+0x67/0xa0
[    0.000000]  [<b132fa45>] math_emulate+0x695/0xc40
[    0.000000]  [<b1027c80>] ? print_prefix+0x60/0xa0
[    0.000000]  [<b13ef9f8>] ? sub_preempt_count+0x8/0x80
[    0.000000]  [<b13ef9f8>] ? sub_preempt_count+0x8/0x80
[    0.000000]  [<b1028719>] ? wake_up_klogd+0x49/0x70
[    0.000000]  [<b1028aa5>] ? console_unlock+0x365/0x4c0
[    0.000000]  [<b13ed7a0>] ? do_debug+0x150/0x150
[    0.000000]  [<b13ed7de>] do_device_not_available+0x3e/0x80
[    0.000000]  [<b13ed17c>] error_code+0x6c/0x74
[    0.000000]  [<b13de90c>] ? fpu_init+0x80/0xf5
[    0.000000]  [<b13e0960>] cpu_init+0x2b0/0x2b8
[    0.000000]  [<b15a6355>] trap_init+0x243/0x24b
[    0.000000]  [<b15a48ba>] start_kernel+0x1b1/0x363
[    0.000000]  [<b15a453e>] ? repair_env_string+0x51/0x51
[    0.000000]  [<b15a4382>] i386_start_kernel+0x12c/0x12f
[    0.000000] Code: 0c 89 f0 e8 50 f4 ff ff 5b 5e 5d c3 8d b6 00 00 00 00 8d bf 00 00 00 00 55 89 e5 57 56 53 83 ec 20 e8 c2 90 2f 00 89 c7 89 55 e4 <8b> 07 64 03 05 94 d6 5e b1 8b 58 04 8b 00 85 c0 89 45 ec 74 76
[    0.000000] EIP: [<b10fa063>] kmem_cache_alloc+0x13/0x130 SS:ESP 0068:b1563e78
[    0.000000] CR2: 0000000000000000
[    0.000000] ---[ end trace a7919e7f17c0a725 ]---
[    0.000000] Kernel panic - not syncing: Attempted to kill the idle task!
[    0.000000] Rebooting in 1 seconds..Press any key to enter the menu

Config attached.

Thanks,

	Ingo

View attachment ".config" of type "text/plain" (72431 bytes)