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Date: Mon, 01 Oct 2007 18:56:12 +0200 From: Peter Zijlstra <a.p.zijlstra@...llo.nl> To: david@...g.hm Cc: linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: OOM killer invoked on 2.6.20.3, need help understanding why On Mon, 2007-10-01 at 08:57 -0700, david@...g.hm wrote: > I have a dual dual-core Opteron box running a 32 bit 2.6.20.3 kernel with > 4G himem (16G in the box) serving as a iptables firewall. I's got E1000 > network cards and a LSI raid controller. OOh, 64bit machine. Seems like a good idea to run a 64bit kernel on it :-) > this morning it died with the message 'kernel panic, out of memory and no > process to kill' > > gong back through it's syslogs I've got quite a few logs, but I need help > in understanding what went wrong (and if it's preventable) > > the process that was running and triggered the OOM is a script > > #!/bin/bash > > PATH=$PATH:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin > > while : > do > logger -t maxconns `cat /proc/sys/net/ipv4/netfilter/ip_conntrack_count` > logger -t afdslog `cat /proc/sys/fs/file-nr |awk '{print $1}'` > > sleep 5 > done > > since the box is a dedicated firewall there is very little running on it > (a few other monitoring scripts like this) > > the conntrack count that was being reported was relativly low (around > 34k, the max is set at 1m) > > if I'm reading the logs correctly it looks like it ran out of lowmem, but > had a lot of himem still available. but I don't know what would have eaten > up the lowmem. > > now the logs and other info > > Oct 1 06:01:04 g1a-c maxconns: 34317 > Oct 1 06:01:05 g1a-c kernel: printk: 1887 messages suppressed. > Oct 1 06:01:05 g1a-c kernel: maxconns invoked oom-killer: gfp_mask=0x84d0, order=0, oomkilladj=0 > Oct 1 06:01:05 g1a-c kernel: [<c0147850>] out_of_memory+0x100/0x130 > Oct 1 06:01:05 g1a-c kernel: [<c0148b2b>] __alloc_pages+0x22b/0x2d0 > Oct 1 06:01:05 g1a-c kernel: [<c01135b1>] pte_alloc_one+0x11/0x20 > Oct 1 06:01:05 g1a-c kernel: [<c014feaa>] __pte_alloc+0x1a/0xb0 > Oct 1 06:01:05 g1a-c kernel: [<c0150369>] copy_pte_range+0x289/0x2b0 > Oct 1 06:01:05 g1a-c kernel: [<c01504b9>] copy_page_range+0x129/0x170 > Oct 1 06:01:05 g1a-c kernel: [<c011e024>] dup_mm+0x214/0x2e0 > Oct 1 06:01:05 g1a-c kernel: [<c011e179>] copy_mm+0x89/0xa0 > Oct 1 06:01:05 g1a-c kernel: [<c011e91a>] copy_process+0x33a/0xc60 > Oct 1 06:01:05 g1a-c kernel: [<c011f2a5>] do_fork+0x65/0x1f0 > Oct 1 06:01:05 g1a-c kernel: [<c027e2c2>] copy_to_user+0x32/0x50 > Oct 1 06:01:05 g1a-c kernel: [<c0101722>] sys_clone+0x32/0x40 > Oct 1 06:01:05 g1a-c kernel: [<c0102a8e>] syscall_call+0x7/0xb > Oct 1 06:01:05 g1a-c kernel: ======================= > Oct 1 06:01:05 g1a-c kernel: Mem-info: > Oct 1 06:01:05 g1a-c kernel: DMA per-cpu: > Oct 1 06:01:05 g1a-c kernel: CPU 0: Hot: hi: 0, btch: 1 usd: 0 Cold: hi: 0, btch: 1 usd: 0 > Oct 1 06:01:05 g1a-c kernel: CPU 1: Hot: hi: 0, btch: 1 usd: 0 Cold: hi: 0, btch: 1 usd: 0 > Oct 1 06:01:05 g1a-c kernel: CPU 2: Hot: hi: 0, btch: 1 usd: 0 Cold: hi: 0, btch: 1 usd: 0 > Oct 1 06:01:05 g1a-c kernel: CPU 3: Hot: hi: 0, btch: 1 usd: 0 Cold: hi: 0, btch: 1 usd: 0 > Oct 1 06:01:05 g1a-c kernel: Normal per-cpu: > Oct 1 06:01:05 g1a-c kernel: CPU 0: Hot: hi: 186, btch: 31 usd: 104 Cold: hi: 62, btch: 15 usd: 58 > Oct 1 06:01:05 g1a-c kernel: CPU 1: Hot: hi: 186, btch: 31 usd: 22 Cold: hi: 62, btch: 15 usd: 52 > Oct 1 06:01:05 g1a-c kernel: CPU 2: Hot: hi: 186, btch: 31 usd: 30 Cold: hi: 62, btch: 15 usd: 58 > Oct 1 06:01:05 g1a-c kernel: CPU 3: Hot: hi: 186, btch: 31 usd: 15 Cold: hi: 62, btch: 15 usd: 60 > Oct 1 06:01:05 g1a-c kernel: HighMem per-cpu: > Oct 1 06:01:05 g1a-c kernel: CPU 0: Hot: hi: 186, btch: 31 usd: 105 Cold: hi: 62, btch: 15 usd: 8 > Oct 1 06:01:05 g1a-c kernel: CPU 1: Hot: hi: 186, btch: 31 usd: 51 Cold: hi: 62, btch: 15 usd: 3 > Oct 1 06:01:05 g1a-c kernel: CPU 2: Hot: hi: 186, btch: 31 usd: 122 Cold: hi: 62, btch: 15 usd: 0 > Oct 1 06:01:05 g1a-c kernel: CPU 3: Hot: hi: 186, btch: 31 usd: 42 Cold: hi: 62, btch: 15 usd: 0 > Oct 1 06:01:05 g1a-c kernel: Active:3496 inactive:616 dirty:16 writeback:0 unstable:0 > Oct 1 06:01:05 g1a-c kernel: free:3941515 slab:6779 mapped:843 pagetables:48 bounce:0 > Oct 1 06:01:05 g1a-c kernel: DMA free:3548kB min:68kB low:84kB high:100kB active:16kB inactive:0kB present:16256kB pages_scanned:56 all_unreclaimable? yes > Oct 1 06:01:05 g1a-c kernel: lowmem_reserve[]: 0 873 16240 > Oct 1 06:01:05 g1a-c kernel: Normal free:3640kB min:3744kB low:4680kB high:5616kB active:148kB inactive:0kB present:894080kB pages_scanned:7196 all_unreclaimable? yes > Oct 1 06:01:05 g1a-c kernel: lowmem_reserve[]: 0 0 122936 > Oct 1 06:01:05 g1a-c kernel: HighMem free:15758872kB min:512kB low:17000kB high:33492kB active:13820kB inactive:2464kB present:15735808kB pages_scanned:0 all_unreclaimable? no > Oct 1 06:01:05 g1a-c kernel: lowmem_reserve[]: 0 0 0 > Oct 1 06:01:05 g1a-c kernel: DMA: 3*4kB 2*8kB 1*16kB 1*32kB 0*64kB 1*128kB 1*256kB 0*512kB 1*1024kB 1*2048kB 0*4096kB = 3532kB > Oct 1 06:01:05 g1a-c kernel: Normal: 0*4kB 23*8kB 6*16kB 1*32kB 0*64kB 0*128kB 1*256kB 0*512kB 1*1024kB 1*2048kB 0*4096kB = 3640kB > Oct 1 06:01:05 g1a-c kernel: HighMem: 122*4kB 658*8kB 622*16kB 464*32kB 391*64kB 336*128kB 277*256kB 226*512kB 169*1024kB 135*2048kB 3668*4096kB = 15758872kB > Oct 1 06:01:05 g1a-c kernel: Swap cache: add 0, delete 0, find 0/0, race 0+0 > Oct 1 06:01:05 g1a-c kernel: Free swap = 2048276kB > Oct 1 06:01:05 g1a-c kernel: Total swap = 2048276kB > Oct 1 06:01:05 g1a-c kernel: Free swap: 2048276kB Seems like it ran out of memory in zone normal. Looks like it all went to SLAB. Could you run your regular workload, and append /proc/slabinfo onto a file every 5 minutes or so? That should tell us who is using all this memory. (assuming it reproduces...) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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