linux-kernel - Re: [linux-next] CRASH on boot up (mm: don't offset memmap for flatmem)

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Date:	Fri, 20 Mar 2015 13:19:05 -0700
From:	Laura Abbott <lauraa@...eaurora.org>
To:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
CC:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	Santosh Shilimkar <ssantosh@...nel.org>,
	Russell King <rmk@....linux.org.uk>,
	Kevin Hilman <khilman@...aro.org>,
	Arnd Bergman <arnd@...db.de>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Kumar Gala <galak@...eaurora.org>,
	Mel Gorman <mgorman@...e.de>, laura@...bott.name
Subject: Re: [linux-next] CRASH on boot up (mm: don't offset memmap for flatmem)

On 3/20/2015 12:51 PM, Steven Rostedt wrote:
> I downloaded the latest linux-next (next-20150320) and started to run
> it against my ftrace tests, and it crashed immediately on boot up in my
> i386 boot with the following:
>
> Initmem setup node 0 [mem 0x0000000000001000-0x000000021edfffff]
> On node 0 totalpages: 2061826
> BUG: Int 6: CR2   (null)
>       EDI   (null)  ESI   (null)  EBP c1157e54  EBX 00000020
>       ESP c1157e50   ES 0000007b   DS 0000007b
>       EDX 00000020  ECX c1157ff8  EAX f381e000
>       vec 00000006  err   (null)  EIP c0ca02f3   CS 00000060  flg 00210086
> Stack: 001f7602 c1157ea8 c125d8d6 c101c0f1   (null) 001f7602   (null) 1edfffff
>         00000002 00000001   (null) c1157e98 c1157ea8 c125d2db 00000001 00000004
>           (null) 00000001 0021ee00 c1157ecc c1157ed4 c1157ee8 c1157efc c125df75
> CPU: 0 PID: 0 Comm: swapper Not tainted 4.0.0-rc4-test-next-20150320+ #82
> Hardware name: MSI MS-7823/CSM-H87M-G43 (MS-7823), BIOS V1.6 02/22/2014
>   00000000 00000000 c1157e00 c0ca62e3 00000020 c1157e54 c123d1d7 c12f19d5
>   00000006 00000000 00000000 00000000 c1157e54 00000020 c1157e50 0000007b
>   0000007b 00000020 c1157ff8 f381e000 00000006 00000000 c0ca02f3 00000060
> Call Trace:
>   [<c0ca62e3>] dump_stack+0x41/0x52
>   [<c123d1d7>] early_idt_handler+0x6b/0x6b
>   [<c0ca02f3>] ? alloc_node_mem_map.constprop.91+0x76/0x7b
>   [<c125d8d6>] free_area_init_node+0x120/0x3bc
>   [<c125d2db>] ? find_min_pfn_for_node+0x5e/0x85
>   [<c125df75>] free_area_init_nodes+0x3d9/0x3ee
>   [<c124fb1b>] zone_sizes_init+0x3b/0x41
>   [<c125046c>] paging_init+0x97/0x9a
>   [<c1250545>] native_pagetable_init+0xd6/0xde
>   [<c0cb02fc>] ? _raw_write_unlock+0x22/0x25
>   [<c0441b37>] ? insert_resource_conflict+0x2f/0x35
>   [<c12418d5>] setup_arch+0xd04/0xe14
>   [<c123d7e6>] start_kernel+0x8a/0x3e6
>   [<c123d30f>] ? reserve_ebda_region+0x57/0x59
>   [<c123d2b4>] i386_start_kernel+0x82/0x86
>
> I bisected it down to this commit:
>
> commit e928abcb309c3423e27680c845b1c7c374a2bb50
> Author: Laura Abbott <lauraa@...eaurora.org>
> Date:   Fri Mar 20 11:13:27 2015 +1100
> Subject: mm: don't offset memmap for flatmem
>
>
> Reverting this commit allows my box to boot once again.
>
> Let me know if you need my config or any other info.
>
> -- Steve
>

Thanks for the report. 0/2 on this particular bug.
Andrew has dropped this for now.
Can you share your .config ? I have a couple of theories
but I may not get a chance to experiment with anything.
I'm suspecting either the assert is wrong or the math
is still incorrect.

Thanks,
Laura

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