Re: ipw2200: firmware DMA loading rework

["Luis R. Rodriguez" <mcgrof@gmail.com>]

On Wed, Sep 2, 2009 at 10:48 AM, Bartlomiej
Zolnierkiewicz<bzolnier@gmail.com> wrote:
> On Sunday 30 August 2009 14:37:42 Bartlomiej Zolnierkiewicz wrote:
>> On Friday 28 August 2009 05:42:31 Zhu Yi wrote:
>> > Bartlomiej Zolnierkiewicz reported an atomic order-6 allocation failure
>> > for ipw2200 firmware loading in kernel 2.6.30. High order allocation is
>>
>> s/2.6.30/2.6.31-rc6/
>>
>> The issue has always been there but it was some recent change that
>> explicitly triggered the allocation failures (after 2.6.31-rc1).
>
> ipw2200 fix works fine but yesterday I got the following error while mounting
> ext4 filesystem (mb_history is optional so the mount succeeded):

OK so the mount succeeded.

> EXT4-fs (dm-2): barriers enabled
> kjournald2 starting: pid 3137, dev dm-2:8, commit interval 5 seconds
> EXT4-fs (dm-2): internal journal on dm-2:8
> EXT4-fs (dm-2): delayed allocation enabled
> EXT4-fs: file extents enabled
> mount: page allocation failure. order:5, mode:0xc0d0
> Pid: 3136, comm: mount Not tainted 2.6.31-rc8-00015-gadda766-dirty #78
> Call Trace:
>  [<c0394de3>] ? printk+0xf/0x14
>  [<c016a693>] __alloc_pages_nodemask+0x400/0x442
>  [<c016a71b>] __get_free_pages+0xf/0x32
>  [<c01865cf>] __kmalloc+0x28/0xfa
>  [<c023d96f>] ? __spin_lock_init+0x28/0x4d
>  [<c01f529d>] ext4_mb_init+0x392/0x460
>  [<c01e99d2>] ext4_fill_super+0x1b96/0x2012
>  [<c0239bc8>] ? snprintf+0x15/0x17
>  [<c01c0b26>] ? disk_name+0x24/0x69
>  [<c018ba63>] get_sb_bdev+0xda/0x117
>  [<c01e6711>] ext4_get_sb+0x13/0x15
>  [<c01e7e3c>] ? ext4_fill_super+0x0/0x2012
>  [<c018ad2d>] vfs_kern_mount+0x3b/0x76
>  [<c018adad>] do_kern_mount+0x33/0xbd
>  [<c019d0af>] do_mount+0x660/0x6b8
>  [<c016a71b>] ? __get_free_pages+0xf/0x32
>  [<c019d168>] sys_mount+0x61/0x99
>  [<c0102908>] sysenter_do_call+0x12/0x36
> Mem-Info:
> DMA per-cpu:
> CPU    0: hi:    0, btch:   1 usd:   0
> Normal per-cpu:
> CPU    0: hi:  186, btch:  31 usd:   0
> Active_anon:25471 active_file:22802 inactive_anon:25812
>  inactive_file:33619 unevictable:2 dirty:2452 writeback:135 unstable:0
>  free:4346 slab:4308 mapped:26038 pagetables:912 bounce:0
> DMA free:2060kB min:84kB low:104kB high:124kB active_anon:1660kB inactive_anon:1848kB active_file:144kB inactive_file:868kB unevictable:0kB present:15788kB pages_scanned:0 all_unreclaimable? no
> lowmem_reserve[]: 0 489 489
> Normal free:15324kB min:2788kB low:3484kB high:4180kB active_anon:100224kB inactive_anon:101400kB active_file:91064kB inactive_file:133608kB unevictable:8kB present:501392kB pages_scanned:0 all_unreclaimable? no
> lowmem_reserve[]: 0 0 0
> DMA: 1*4kB 1*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 1*2048kB 0*4096kB = 2060kB
> Normal: 1283*4kB 648*8kB 159*16kB 53*32kB 10*64kB 1*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 15324kB
> 57947 total pagecache pages
> 878 pages in swap cache
> Swap cache stats: add 920, delete 42, find 11/11
> Free swap  = 1016436kB
> Total swap = 1020116kB
> 131056 pages RAM
> 4233 pages reserved
> 90573 pages shared
> 77286 pages non-shared
> EXT4-fs: mballoc enabled
> EXT4-fs (dm-2): mounted filesystem with ordered data mode
>
> Thus it seems like the original bug is still there and any ideas how to
> debug the problem further are appreciated..
>
> The complete dmesg and kernel config are here:
>
> http://www.kernel.org/pub/linux/kernel/people/bart/ext4-paf.dmesg
> http://www.kernel.org/pub/linux/kernel/people/bart/ext4-paf.config

This looks very similar to the kmemleak ext4 reports upon a mount. If
it is the same issue, which from the trace it seems it is, then this
is due to an extra kmalloc() allocation and this apparently will not
get fixed on 2.6.31 due to the closeness of the merge window and the
non-criticalness this issue has been deemed.

A patch fix is part of the ext4-patchqueue
http://repo.or.cz/w/ext4-patch-queue.git

  Luis

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