Date:	Mon, 08 Nov 2010 18:10:30 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Nikhil Sethi
	 (निखिल सेठी) 
	<nikhil@...hi.ws>
Cc:	Michael Guntsche <mike@...loops.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>, Hugh Dickins <hughd@...gle.com>
Subject: Re: [2.6.35-rc1] page alloc failure order:1, mode:0x4020

Le lundi 08 novembre 2010 à 08:25 -0800, Nikhil Sethi (निखिल सेठी) a
écrit :
> Thanks Eric, for all the help.
> I get very occasional errors with vanilla 2.6.36 kernel with your
> patch. Error messages are slightly different, and very rare compared
> to without your patch. 2.6.35.7 seems fine, and does not show this
> error.
> 
> rsync: page allocation failure. order:1, mode:0x4020
> Pid: 31479, comm: rsync Not tainted 2.6.36-rc1 #1
> Call Trace:
>  [<c0246b2c>] ? __alloc_pages_nodemask+0x3f1/0x52e
>  [<c0261330>] ? __slab_alloc+0x40f/0x45a
>  [<c02617ca>] ? __kmalloc_track_caller+0x91/0x97
>  [<d09db01a>] ? ath_rxbuf_alloc+0x1a/0x78 [ath]
>  [<d09db01a>] ? ath_rxbuf_alloc+0x1a/0x78 [ath]
>  [<c033a8d0>] ? __alloc_skb+0x57/0x100
>  [<d09db01a>] ? ath_rxbuf_alloc+0x1a/0x78 [ath]
>  [<d0b01f2e>] ? ath_rx_tasklet+0x680/0xcfe [ath9k]
>  [<c02234ae>] ? __queue_work+0xe4/0x1a2
>  [<d0b00244>] ? ath9k_tasklet+0xd0/0x134 [ath9k]
>  [<c0219a43>] ? tasklet_action+0x5f/0x65
>  [<c0219cf4>] ? __do_softirq+0x60/0xc6
>  [<c0219d88>] ? do_softirq+0x2e/0x30
>  [<c0219e7b>] ? irq_exit+0x54/0x56
>  [<c02038e0>] ? do_IRQ+0x3a/0x72
>  [<c0202bc9>] ? common_interrupt+0x29/0x30
>  [<c02d89a0>] ? cfq_may_queue+0x0/0x92
>  [<c02d1567>] ? get_request+0x121/0x23e
>  [<c02d16a4>] ? get_request_wait+0x20/0xfd
>  [<c02d8f16>] ? cfq_merge+0x0/0x69
>  [<c02cfd40>] ? elv_merge+0x14b/0x170
>  [<c02d2375>] ? __make_request+0x71/0x364
>  [<c02d1fe2>] ? generic_make_request+0x14f/0x318
>  [<c0243fb1>] ? mempool_alloc+0x35/0xb9
>  [<c02d21e9>] ? submit_bio+0x3e/0x90
>  [<c0281c14>] ? bio_alloc_bioset+0x33/0x9e
>  [<c027e780>] ? submit_bh+0xbc/0xec
>  [<c027f4e2>] ? ll_rw_block+0x72/0x74
>  [<c027f504>] ? __breadahead+0x20/0x30
>  [<c02a3a8f>] ? __ext4_get_inode_loc+0x308/0x416
>  [<c02a8154>] ? ext4_iget+0x52/0x652
>  [<c02aa327>] ? ext4_lookup+0x65/0xbf
>  [<c026a6bb>] ? d_alloc_and_lookup+0x30/0x58
>  [<c026b84a>] ? do_lookup+0xc5/0xfe
>  [<c026c239>] ? link_path_walk+0x4d1/0x8d6
>  [<c026c722>] ? path_walk+0x48/0xa9
>  [<c026c7be>] ? do_path_lookup+0x3b/0x3f
>  [<c026d06d>] ? user_path_at+0x30/0x64
>  [<c0266446>] ? cp_new_stat64+0xee/0x100
>  [<c026664a>] ? vfs_fstatat+0x25/0x63
>  [<c02666c9>] ? vfs_lstat+0x13/0x15
>  [<c02666da>] ? sys_lstat64+0xf/0x23
>  [<c02141ed>] ? switched_to_idle+0x1a/0x43
>  [<c0393395>] ? syscall_call+0x7/0xb
>  [<c0390000>] ? quirk_ich7_lpc+0x46/0x4d
> Mem-Info:
> DMA per-cpu:
> CPU    0: hi:    0, btch:   1 usd:   0
> Normal per-cpu:
> CPU    0: hi:   90, btch:  15 usd:  84
> active_anon:14957 inactive_anon:15137 isolated_anon:0
>  active_file:11820 inactive_file:11640 isolated_file:0
>  unevictable:470 dirty:1378 writeback:0 unstable:0
>  free:975 slab_reclaimable:5606 slab_unreclaimable:2343
>  mapped:2786 shmem:72 pagetables:394 bounce:0
> DMA free:1000kB min:124kB low:152kB high:184kB active_anon:2896kB
> inactive_anon:3552kB active_file:2116kB inactive_file:1768kB
> unevictable:348kB isolated(anon):0kB isolated(file):0kB
> present:15864kB mlocked:348kB dirty:16kB writeback:0kB mapped:228kB
> shmem:32kB slab_reclaimable:1136kB slab_unreclaimable:608kB
> kernel_stack:144kB pagetables:52kB unstable:0kB bounce:0kB
> writeback_tmp:0kB pages_scanned:32 all_unreclaimable? no
> lowmem_reserve[]: 0 238 238
> Normal free:2900kB min:1908kB low:2384kB high:2860kB
> active_anon:56932kB inactive_anon:56996kB active_file:45164kB
> inactive_file:44792kB unevictable:1532kB isolated(anon):0kB
> isolated(file):0kB present:243840kB mlocked:1532kB dirty:5496kB
> writeback:0kB mapped:10916kB shmem:256kB slab_reclaimable:21288kB
> slab_unreclaimable:8764kB kernel_stack:1056kB pagetables:1524kB
> unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0
> all_unreclaimable? no
> lowmem_reserve[]: 0 0 0
> DMA: 6*4kB 14*8kB 16*16kB 1*32kB 1*64kB 0*128kB 0*256kB 1*512kB
> 0*1024kB 0*2048kB 0*4096kB = 1000kB
> Normal: 691*4kB 17*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB
> 0*1024kB 0*2048kB 0*4096kB = 2900kB
> 28310 total pagecache pages
> 4385 pages in swap cache
> Swap cache stats: add 144387, delete 140002, find 98398/115667
> Free swap  = 889116kB
> Total swap = 1023996kB
> 65535 pages RAM
> 1245 pages reserved
> 27369 pages shared
> 42219 pages non-shared
> SLUB: Unable to allocate memory on node -1 (gfp=0x20)
>   cache: kmalloc-8192, object size: 8192, buffer size: 8192, default
> order: 3, min order: 1
>   node 0: slabs: 133, objs: 529, free: 0
> skbuff alloc of size 3872 failed
> rsync: page allocation failure. order:1, mode:0x4020
> Pid: 31479, comm: rsync Not tainted 2.6.36-rc1 #1
> Call Trace:
>  [<c0246b2c>] ? __alloc_pages_nodemask+0x3f1/0x52e
>  [<c0261330>] ? __slab_alloc+0x40f/0x45a
>  [<c02617ca>] ? __kmalloc_track_caller+0x91/0x97
>  [<d09db01a>] ? ath_rxbuf_alloc+0x1a/0x78 [ath]
>  [<d09db01a>] ? ath_rxbuf_alloc+0x1a/0x78 [ath]
>  [<c033a8d0>] ? __alloc_skb+0x57/0x100
>  [<d09db01a>] ? ath_rxbuf_alloc+0x1a/0x78 [ath]
>  [<d0b01f2e>] ? ath_rx_tasklet+0x680/0xcfe [ath9k]
>  [<c02234ae>] ? __queue_work+0xe4/0x1a2
>  [<d0b00244>] ? ath9k_tasklet+0xd0/0x134 [ath9k]
>  [<c0219a43>] ? tasklet_action+0x5f/0x65
>  [<c0219cf4>] ? __do_softirq+0x60/0xc6
>  [<c0219d88>] ? do_softirq+0x2e/0x30
>  [<c0219e7b>] ? irq_exit+0x54/0x56
>  [<c02038e0>] ? do_IRQ+0x3a/0x72
>  [<c0202bc9>] ? common_interrupt+0x29/0x30
>  [<c02d89a0>] ? cfq_may_queue+0x0/0x92
>  [<c02d1567>] ? get_request+0x121/0x23e
>  [<c02d16a4>] ? get_request_wait+0x20/0xfd
>  [<c02d8f16>] ? cfq_merge+0x0/0x69
>  [<c02cfd40>] ? elv_merge+0x14b/0x170
>  [<c02d2375>] ? __make_request+0x71/0x364
>  [<c02d1fe2>] ? generic_make_request+0x14f/0x318
>  [<c0243fb1>] ? mempool_alloc+0x35/0xb9
>  [<c02d21e9>] ? submit_bio+0x3e/0x90
>  [<c0281c14>] ? bio_alloc_bioset+0x33/0x9e
>  [<c027e780>] ? submit_bh+0xbc/0xec
>  [<c027f4e2>] ? ll_rw_block+0x72/0x74
>  [<c027f504>] ? __breadahead+0x20/0x30
>  [<c02a3a8f>] ? __ext4_get_inode_loc+0x308/0x416
>  [<c02a8154>] ? ext4_iget+0x52/0x652
>  [<c02aa327>] ? ext4_lookup+0x65/0xbf
>  [<c026a6bb>] ? d_alloc_and_lookup+0x30/0x58
>  [<c026b84a>] ? do_lookup+0xc5/0xfe
>  [<c026c239>] ? link_path_walk+0x4d1/0x8d6
>  [<c026c722>] ? path_walk+0x48/0xa9
>  [<c026c7be>] ? do_path_lookup+0x3b/0x3f
>  [<c026d06d>] ? user_path_at+0x30/0x64
>  [<c0266446>] ? cp_new_stat64+0xee/0x100
>  [<c026664a>] ? vfs_fstatat+0x25/0x63
>  [<c02666c9>] ? vfs_lstat+0x13/0x15
>  [<c02666da>] ? sys_lstat64+0xf/0x23
>  [<c02141ed>] ? switched_to_idle+0x1a/0x43
>  [<c0393395>] ? syscall_call+0x7/0xb
>  [<c0390000>] ? quirk_ich7_lpc+0x46/0x4d
> Mem-Info:
> DMA per-cpu:
> CPU    0: hi:    0, btch:   1 usd:   0
> Normal per-cpu:
> CPU    0: hi:   90, btch:  15 usd:  84
> active_anon:14957 inactive_anon:15137 isolated_anon:0
>  active_file:11820 inactive_file:11640 isolated_file:0
>  unevictable:470 dirty:1378 writeback:0 unstable:0
>  free:975 slab_reclaimable:5606 slab_unreclaimable:2343
>  mapped:2786 shmem:72 pagetables:394 bounce:0
> DMA free:1000kB min:124kB low:152kB high:184kB active_anon:2896kB
> inactive_anon:3552kB active_file:2116kB inactive_file:1768kB
> unevictable:348kB isolated(anon):0kB isolated(file):0kB
> present:15864kB mlocked:348kB dirty:16kB writeback:0kB mapped:228kB
> shmem:32kB slab_reclaimable:1136kB slab_unreclaimable:608kB
> kernel_stack:144kB pagetables:52kB unstable:0kB bounce:0kB
> writeback_tmp:0kB pages_scanned:32 all_unreclaimable? no
> lowmem_reserve[]: 0 238 238
> Normal free:2900kB min:1908kB low:2384kB high:2860kB
> active_anon:56932kB inactive_anon:56996kB active_file:45164kB
> inactive_file:44792kB unevictable:1532kB isolated(anon):0kB
> isolated(file):0kB present:243840kB mlocked:1532kB dirty:5496kB
> writeback:0kB mapped:10916kB shmem:256kB slab_reclaimable:21288kB
> slab_unreclaimable:8764kB kernel_stack:1056kB pagetables:1524kB
> unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0
> all_unreclaimable? no
> lowmem_reserve[]: 0 0 0
> DMA: 6*4kB 14*8kB 16*16kB 1*32kB 1*64kB 0*128kB 0*256kB 1*512kB
> 0*1024kB 0*2048kB 0*4096kB = 1000kB
> Normal: 691*4kB 17*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB
> 0*1024kB 0*2048kB 0*4096kB = 2900kB
> 28310 total pagecache pages
> 4385 pages in swap cache
> Swap cache stats: add 144387, delete 140002, find 98398/115667
> Free swap  = 889116kB
> Total swap = 1023996kB
> 65535 pages RAM
> 1245 pages reserved
> 27369 pages shared
> 42219 pages non-shared
> SLUB: Unable to allocate memory on node -1 (gfp=0x20)
>   cache: kmalloc-8192, object size: 8192, buffer size: 8192, default
> order: 3, min order: 1
>   node 0: slabs: 133, objs: 529, free: 0
> skbuff alloc of size 3872 failed
> 
> 2010/9/5 Eric Dumazet <eric.dumazet@...il.com>
> >
> > Le dimanche 05 septembre 2010 à 08:51 -0700, Nikhil Sethi (निखिल सेठी) a
> > écrit :
> > > This came back. Here is the dmesg output. It might be the problem only
> > > happens if I have wmm_enabled=1 in my hostapd.conf. That is the only
> > > thing that I changed yesterday, and today I saw these messages in my
> > > logs. I will try to conform this.
> > >
> > >
> > > I am running 2.6.35.4 with this patch:
> > >
> > >
> > > *** 225,234 ****
> > >    int error = 0, i;
> > >    u32 size;
> > >
> > > !
> > > ! common->rx_bufsize = roundup(IEEE80211_MAX_MPDU_LEN +
> > > !     ah->caps.rx_status_len,
> > > !     min(common->cachelsz, (u16)64));
> > >
> > >    ath9k_hw_set_rx_bufsize(ah, common->rx_bufsize -
> > >       ah->caps.rx_status_len);
> > > --- 225,234 ----
> > >    int error = 0, i;
> > >    u32 size;
> > >
> > > ! size = roundup(IEEE80211_MAX_MPDU_LEN + ah->caps.rx_status_len,
> > > !                        min(common->cachelsz, (u16)64));
> > > !         common->rx_bufsize = min_t(u32, size,
> > > !                                    SKB_MAX_ORDER(NET_SKB_PAD +
> > > common->cachelsz, 0));


Its very hard to follow this thread, with a message every two months.


As I said, this patch got a min_t() instead of max_t()

http://kerneltrap.org/mailarchive/linux-kernel/2010/8/25/4611322

If you still have kmalloc-8192 allocations, I suspect you dont use right
patch.



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