linux-kernel - Re: [RFC v3 0/8] x86, xsave: rework of extended state handling, LWP support

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Message-ID: <20110407153029.GU13@escobedo.osrc.amd.com>
Date:	Thu, 7 Apr 2011 17:30:29 +0200
From:	Hans Rosenfeld <hans.rosenfeld@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"hpa@...or.com" <hpa@...or.com>,
	"brgerst@...il.com" <brgerst@...il.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"suresh.b.siddha@...el.com" <suresh.b.siddha@...el.com>,
	"eranian@...gle.com" <eranian@...gle.com>,
	"Richter, Robert" <robert.richter@....com>,
	"Herrmann3, Andreas" <Andreas.Herrmann3@....com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v3 0/8] x86, xsave: rework of extended state handling, LWP
 support

On Thu, Apr 07, 2011 at 03:23:05AM -0400, Ingo Molnar wrote:
> 
> FYI, the bits in tip:x86/xsave crash on boot on an AMD X2 testbox:
> 
> [   10.823492] Freeing unused kernel memory: 616k freed
> [   11.087787] ------------[ cut here ]------------
> [   11.088312] Kernel BUG at ffffffff8100a140 [verbose debug info unavailable]
> [   11.088312] invalid opcode: 0000 [#1] SMP 
> [   11.088312] last sysfs file: 
> [   11.088312] CPU 1 
> [   11.088312] Modules linked in:
> [   11.088312] 
> [   11.088312] Pid: 41, comm: modprobe Not tainted 2.6.39-rc2-tip+ #113394  
> [   11.088312] RIP: 0010:[<ffffffff8100a140>]  [<ffffffff8100a140>] start_thread_common.constprop.1+0x100/0x110
> [   11.088312] RSP: 0018:ffff88003d7c5c40  EFLAGS: 00010246
> [   11.088312] RAX: ffff88003d7c5fd8 RBX: ffff88003d74bd40 RCX: 0000000000000033
> [   11.088312] RDX: 00007ffffffff000 RSI: 000000310f600ac0 RDI: 0000000000000000
> [   11.088312] RBP: ffff88003d7c5c60 R08: 0000000000000000 R09: 0000000000000004
> [   11.088312] R10: 00007fff4ae4dd68 R11: 0000000000000000 R12: 00007fff4ae4dd60
> [   11.088312] R13: 000000310f600ac0 R14: 0000000000000033 R15: ffff88003d74bd40
> [   11.088312] FS:  00007f48d909f780(0000) GS:ffff88003fd00000(0000) knlGS:0000000000000000
> [   11.088312] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [   11.088312] CR2: 00007fff4ae4def9 CR3: 000000003d7af000 CR4: 00000000000006e0
> [   11.088312] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [   11.088312] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [   11.088312] Process modprobe (pid: 41, threadinfo ffff88003d7c4000, task ffff88003d74bd40)
> [   11.088312] Stack:
> [   11.088312]  ffff88003d72c400 ffff88003d60a400 0000000000000000 ffff88003d7c5e80
> [   11.088312]  ffff88003d7c5c70 ffffffff8100a546 ffff88003d7c5d90 ffffffff8117c7de
> [   11.088312]  ffff88003d74bd40 0000000000000004 00007fff4ae4dda8 00007fff4ae4dd68
> [   11.088312] Call Trace:
> [   11.088312]  [<ffffffff8100a546>] start_thread+0x16/0x20
> [   11.088312]  [<ffffffff8117c7de>] load_elf_binary+0x14fe/0x1980
> [   11.088312]  [<ffffffff81138392>] search_binary_handler+0xc2/0x2a0
> [   11.088312]  [<ffffffff8117b2e0>] ? load_elf_library+0x2b0/0x2b0
> [   11.088312]  [<ffffffff8113a35c>] do_execve+0x24c/0x2d0
> [   11.088312]  [<ffffffff81014b97>] sys_execve+0x47/0x80
> [   11.088312]  [<ffffffff8145b698>] kernel_execve+0x68/0xd0
> [   11.088312]  [<ffffffff8106ca83>] ? ____call_usermodehelper+0x93/0xa0
> [   11.088312]  [<ffffffff8145b624>] kernel_thread_helper+0x4/0x10
> [   11.088312]  [<ffffffff81459f54>] ? retint_restore_args+0x13/0x13
> [   11.088312]  [<ffffffff8106c9f0>] ? call_usermodehelper_setup+0xe0/0xe0
> [   11.088312]  [<ffffffff8145b620>] ? gs_change+0x13/0x13
> [   11.088312] Code: f0 4c 8b 75 f8 c9 c3 0f 1f 40 00 48 8b 3d 19 01 64 00 48 85 ff 74 14 48 89 bb a0 04 00 00 48 c7 05 02 01 64 00 00 00 00 00 eb a1 <0f> 0b 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 66 
> [   11.088312] RIP  [<ffffffff8100a140>] start_thread_common.constprop.1+0x100/0x110
> [   11.088312]  RSP <ffff88003d7c5c40>

Sorry for that, it seems I made a wrong assumption about
kernel_execve() usage. Updated patches will follow shortly.


Hans


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