linux-kernel - Re: 2.6.24-rc1-54866f032307063776b4eff7eadb131d47f9f9b4 fails to boot: kernel BUG at include/linux/scatterlist.h:49!

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Message-ID: <472BAFDF.9000301@s5r6.in-berlin.de>
Date:	Sat, 03 Nov 2007 00:16:47 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	Torsten Kaiser <just.for.lkml@...glemail.com>,
	linux-kernel@...r.kernel.org, linux1394-devel@...ts.sourceforge.net
Subject: Re: 2.6.24-rc1-54866f032307063776b4eff7eadb131d47f9f9b4 fails to
 boot: kernel BUG at include/linux/scatterlist.h:49!

I wrote:
> Torsten Kaiser wrote:
>> Both 2.6.24-rc1 and the current git version fail to boot for me:
>>
>> [   57.182205] ohci1394: fw-host0: OHCI-1394 1.1 (PCI): IRQ=[16] MMIO=[effff800-efffffff]  Max Packet=[2048]  IR/IT contexts=[4/8]
>> [   57.194032] eth1394: eth2: IPv4 over IEEE 1394 (fw-host0)
>> [   57.199527] ------------[ cut here ]------------
>> [   57.204154] kernel BUG at include/linux/scatterlist.h:49!
>> [   57.209559] invalid opcode: 0000 [1] SMP
>> [   57.213667] CPU 0
>> [   57.215742] Modules linked in:
>> [   57.218857] Pid: 1, comm: swapper Not tainted 2.6.24-rc1 #1
>> [   57.224435] RIP: 0010:[<ffffffff80463512>]  [<ffffffff80463512>] dma_region_alloc+0x142/0x180
>> [   57.233003] RSP: 0000:ffff810004f29db0  EFLAGS: 00010293
>> [   57.238322] RAX: ffffc20001454000 RBX: 0000000000000000 RCX: ffffe20001c7e690
>> [   57.245457] RDX: 0000000000000000 RSI: 00003ffffffff000 RDI: 0000000000000388
>> [   57.252592] RBP: ffff810005ddca48 R08: 0000000000000000 R09: ffffc20001454000
>> [   57.259727] R10: 0000000000000002 R11: 0000000000000000 R12: 0000000087654321
>> [   57.266862] R13: ffff810100914000 R14: 0000000000000002 R15: ffff810005e88000
>> [   57.273996] FS:  0000000000000000(0000) GS:ffffffff8079c000(0000) knlGS:0000000000000000
>> [   57.282082] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
>> [   57.287834] CR2: 0000000000e01766 CR3: 0000000000201000 CR4: 00000000000006e0
>> [   57.294968] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> [   57.302102] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>> [   57.309238] Process swapper (pid: 1, threadinfo ffff810004f28000, task ffff81010032a000)
>> [   57.317332] Stack:  ffff810005ddca48 0000000000000002 ffff810005ddca00 0000000000000010
>> [   57.325546]  000000000000001f ffffffff80464146 ffffffff8089ff00 0000000000010000
>> [   57.333104]  ffff810005ddca00 ffff8101011b66c0 ffff810005e88000 ffffffff80754740
>> [   57.340455] Call Trace:
>> [   57.343139]  [<ffffffff80464146>] hpsb_iso_common_init+0x1e6/0x210
>> [   57.349322]  [<ffffffff80464198>] hpsb_iso_recv_init+0x28/0x70
>> [   57.355159]  [<ffffffff8046c940>] ether1394_iso+0x0/0x130
>> [   57.360564]  [<ffffffff8046bc08>] ether1394_recv_init+0x58/0xd0
[...]
>> from gdb:
>> 0xffffffff80463512 is in dma_region_alloc (include/linux/scatterlist.h:49).
>> 44               * In order for the low bit stealing approach to work, pages
>> 45               * must be aligned at a 32-bit boundary as a minimum.
>> 46               */
>> 47              BUG_ON((unsigned long) page & 0x03);
>> 48      #ifdef CONFIG_DEBUG_SG
>> 49              BUG_ON(sg->sg_magic != SG_MAGIC);
>> 50      #endif
>> 51              sg->page_link = page_link | (unsigned long) page;
>> 52      }
>> 53
> 
> Uh oh...
> 
> I'm afraid the ieee1394 core's own scatter-gather list managing code
> didn't survive the changes in the kernel's s/g list implementation.
> 
> Alas I will be quite busy with non-Linux related stuff during at least
> the next two weeks and can't fix this myself for now.

Jens, maybe you can come up with a fix quicker than I could.
-- 
Stefan Richter
-=====-=-=== =-== ---=-
http://arcgraph.de/sr/
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