From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?Q?Am=C3=A9rico_Wang?= Subject: Re: kernel error : 'find /proc/ -type f | xargs -n 1 head -c 10 >/dev/null' Date: Thu, 28 Jan 2010 12:51:02 +0800 Message-ID: <2375c9f91001272051x3d2e89r24133c42f52082ea@mail.gmail.com> References: <201001212017.00160.toralf.foerster@gmx.de> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org To: =?UTF-8?Q?Toralf_F=C3=B6rster?= Return-path: In-Reply-To: <201001212017.00160.toralf.foerster@gmx.de> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org 2010/1/22 Toralf F=C3=B6rster : > I was inspired by http://article.gmane.org/gmane.linux.kernel/941115 . > > Running the command (se subject) as a normal user at a 2.6.32.4 kernel > gives this in /var/log/messages: > > 2010-01-21T20:11:39.171+01:00 n22 kernel: head: page allocation failure. = order:9, mode:0xd0 Hmm, it is suspecious that we need 2^9 pages for seq_file... > 2010-01-21T20:11:39.171+01:00 n22 kernel: Pid: 2324, comm: head Not taint= ed 2.6.32.4 #1 > 2010-01-21T20:11:39.171+01:00 n22 kernel: Call Trace: > 2010-01-21T20:11:39.171+01:00 n22 kernel: [] ? __alloc_pages_no= demask+0x4bc/0x5a0 > 2010-01-21T20:11:39.171+01:00 n22 kernel: [] ? cache_alloc_refi= ll+0x2ba/0x510 > 2010-01-21T20:11:39.171+01:00 n22 kernel: [] ? __kmalloc+0xe9/0= xf0 > 2010-01-21T20:11:39.171+01:00 n22 kernel: [] ? seq_read+0x195/0= x370 > 2010-01-21T20:11:39.171+01:00 n22 kernel: [] ? seq_read+0x0/0x3= 70 > 2010-01-21T20:11:39.171+01:00 n22 kernel: [] ? proc_reg_read+0x= 5f/0x90 > 2010-01-21T20:11:39.171+01:00 n22 kernel: [] ? proc_reg_read+0x= 0/0x90 > 2010-01-21T20:11:39.171+01:00 n22 kernel: [] ? vfs_read+0xa5/0x= 190 > 2010-01-21T20:11:39.171+01:00 n22 kernel: [] ? sys_read+0x41/0x= 80 > 2010-01-21T20:11:39.171+01:00 n22 kernel: [] ? sysenter_do_call= +0x12/0x26 > 2010-01-21T20:11:39.171+01:00 n22 kernel: Mem-Info: > 2010-01-21T20:11:39.171+01:00 n22 kernel: DMA per-cpu: > 2010-01-21T20:11:39.172+01:00 n22 kernel: CPU =C2=A0 =C2=A00: hi: =C2=A0 = =C2=A00, btch: =C2=A0 1 usd: =C2=A0 0 > 2010-01-21T20:11:39.172+01:00 n22 kernel: CPU =C2=A0 =C2=A01: hi: =C2=A0 = =C2=A00, btch: =C2=A0 1 usd: =C2=A0 0 > 2010-01-21T20:11:39.172+01:00 n22 kernel: Normal per-cpu: > 2010-01-21T20:11:39.172+01:00 n22 kernel: CPU =C2=A0 =C2=A00: hi: =C2=A01= 86, btch: =C2=A031 usd: =C2=A0 0 > 2010-01-21T20:11:39.172+01:00 n22 kernel: CPU =C2=A0 =C2=A01: hi: =C2=A01= 86, btch: =C2=A031 usd: =C2=A0 0 > 2010-01-21T20:11:39.172+01:00 n22 kernel: HighMem per-cpu: > 2010-01-21T20:11:39.172+01:00 n22 kernel: CPU =C2=A0 =C2=A00: hi: =C2=A01= 86, btch: =C2=A031 usd: =C2=A0 0 > 2010-01-21T20:11:39.172+01:00 n22 kernel: CPU =C2=A0 =C2=A01: hi: =C2=A01= 86, btch: =C2=A031 usd: =C2=A0 0 > 2010-01-21T20:11:39.172+01:00 n22 kernel: active_anon:77374 inactive_anon= :26716 isolated_anon:0 > 2010-01-21T20:11:39.172+01:00 n22 kernel: active_file:154367 inactive_fil= e:77664 isolated_file:0 > 2010-01-21T20:11:39.172+01:00 n22 kernel: unevictable:0 dirty:74 writebac= k:432 unstable:0 > 2010-01-21T20:11:39.172+01:00 n22 kernel: free:107209 slab_reclaimable:41= 314 slab_unreclaimable:3995 > 2010-01-21T20:11:39.172+01:00 n22 kernel: mapped:23759 shmem:19312 pageta= bles:882 bounce:0 > 2010-01-21T20:11:39.172+01:00 n22 kernel: DMA free:12296kB min:64kB low:8= 0kB high:96kB active_anon:0kB inactive_anon:0kB active_file:772kB inactive_= file:372kB unevictable:0kB > isolated(anon):0kB isolated(file):0kB present:15864kB mlocked:0kB dirty:0= kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:2520kB slab_unreclai= mable:0kB kernel_stack:0kB pagetables:0kB > unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimab= le? no > 2010-01-21T20:11:39.172+01:00 n22 kernel: lowmem_reserve[]: 0 865 1911 19= 11 > 2010-01-21T20:11:39.172+01:00 n22 kernel: Normal free:282076kB min:3728kB= low:4660kB high:5592kB active_anon:8kB inactive_anon:3320kB active_file:27= 9600kB inactive_file:121612kB > unevictable:0kB isolated(anon):0kB isolated(file):0kB present:885944kB ml= ocked:0kB dirty:140kB writeback:0kB mapped:276kB shmem:16kB slab_reclaimabl= e:162736kB slab_unreclaimable:15980kB > kernel_stack:900kB pagetables:3528kB unstable:0kB bounce:0kB writeback_tm= p:0kB pages_scanned:0 all_unreclaimable? no > 2010-01-21T20:11:39.172+01:00 n22 kernel: lowmem_reserve[]: 0 0 8369 8369 > 2010-01-21T20:11:39.172+01:00 n22 kernel: HighMem free:134464kB min:512kB= low:1636kB high:2764kB active_anon:309488kB inactive_anon:103544kB active_= file:337096kB > inactive_file:188672kB unevictable:0kB isolated(anon):0kB isolated(file):= 0kB present:1071256kB mlocked:0kB dirty:156kB writeback:1728kB mapped:94760= kB shmem:77232kB slab_reclaimable:0kB > slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounc= e:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no > 2010-01-21T20:11:39.172+01:00 n22 kernel: lowmem_reserve[]: 0 0 0 0 > 2010-01-21T20:11:39.172+01:00 n22 kernel: DMA: 288*4kB 121*8kB 80*16kB 62= *32kB 48*64kB 22*128kB 4*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB =3D 12296= kB > 2010-01-21T20:11:39.172+01:00 n22 kernel: Normal: 19101*4kB 8755*8kB 3545= *16kB 1846*32kB 186*64kB 34*128kB 2*256kB 2*512kB 0*1024kB 1*2048kB 0*4096k= B =3D 282076kB Obviously you have one 2^9-page chuck here, but page allocator doesn't give this. > 2010-01-21T20:11:39.172+01:00 n22 kernel: HighMem: 304*4kB 260*8kB 1594*1= 6kB 1644*32kB 571*64kB 89*128kB 18*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB= =3D 134464kB > 2010-01-21T20:11:39.172+01:00 n22 kernel: 251864 total pagecache pages > 2010-01-21T20:11:39.172+01:00 n22 kernel: 505 pages in swap cache > 2010-01-21T20:11:39.172+01:00 n22 kernel: Swap cache stats: add 587, dele= te 82, find 189/195 > 2010-01-21T20:11:39.172+01:00 n22 kernel: Free swap =C2=A0=3D 2001148kB > 2010-01-21T20:11:39.172+01:00 n22 kernel: Total swap =3D 2003360kB > 2010-01-21T20:11:39.172+01:00 n22 kernel: 498176 pages RAM > 2010-01-21T20:11:39.172+01:00 n22 kernel: 270850 pages HighMem > 2010-01-21T20:11:39.172+01:00 n22 kernel: 5979 pages reserved > 2010-01-21T20:11:39.172+01:00 n22 kernel: 251238 pages shared > 2010-01-21T20:11:39.172+01:00 n22 kernel: 209073 pages non-shared > 2010-01-21T20:11:39.480+01:00 n22 kernel: ACPI: Please implement acpi_vid= eo_bus_ROM_seq_show > For me, this seems to be either a problem of mm page allocator or a problem of seq_file, the former seems to be more likely since we already got some o= ther page allocation failure report... 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