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Community ▶ Questions ▶ Kernel: safe_halt messages
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Kernel: safe_halt messages

general

logcheck just found the follow kernel messages for me; does anyone know what they mean?

I'm using 2.6.27.4-x86_64-linode3

Dec 24 22:11:37 linode kernel: safe_halt+0xc/0x20
Dec 24 22:11:38 linode kernel:  [<ffffffff8020bf66>] xen_idle+0x26/0x50
Dec 24 22:11:38 linode kernel:  [<ffffffff8020f955>] cpu_idle+0x45/0x90
Dec 24 22:11:38 linode kernel:
Dec 24 22:11:38 linode kernel: Mem-Info:
Dec 24 22:11:38 linode kernel: DMA per-cpu:
Dec 24 22:11:38 linode kernel: CPU    0: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    1: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    2: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    3: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: DMA32 per-cpu:
Dec 24 22:11:38 linode kernel: CPU    0: hi:   90, btch:  15 usd:  89
Dec 24 22:11:38 linode kernel: CPU    1: hi:   90, btch:  15 usd:  88
Dec 24 22:11:38 linode kernel: CPU    2: hi:   90, btch:  15 usd:  83
Dec 24 22:11:38 linode kernel: CPU    3: hi:   90, btch:  15 usd:  40
Dec 24 22:11:38 linode kernel: Active:76415 inactive:2170 dirty:83 writeback:0 unstable:0
Dec 24 22:11:38 linode kernel:  free:541 slab:5106 mapped:17805 pagetables:1443 bounce:0
Dec 24 22:11:38 linode kernel: DMA free:1356kB min:40kB low:48kB high:60kB active:5316kB inactive:0kB present:6540kB pages_scanned:47 all_unreclaimable? no
Dec 24 22:11:38 linode kernel: lowmem_reserve[]: 0 339 339 339
Dec 24 22:11:38 linode kernel: DMA32 free:808kB min:2332kB low:2912kB high:3496kB active:300344kB inactive:8680kB present:347440kB pages_scanned:523 all_unreclaimable? no
Dec 24 22:11:38 linode kernel: lowmem_reserve[]: 0 0 0 0
Dec 24 22:11:38 linode kernel: DMA: 1*4kB 1*8kB 0*16kB 0*32kB 1*64kB 0*128kB 5*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1356kB
Dec 24 22:11:38 linode kernel: DMA32: 0*4kB 1*8kB 1*16kB 0*32kB 0*64kB 0*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 792kB
Dec 24 22:11:38 linode kernel: 25178 total pagecache pages
Dec 24 22:11:38 linode kernel: 2380 pages in swap cache
Dec 24 22:11:38 linode kernel: Swap cache stats: add 12319636, delete 12317256, find 33841123/36454188
Dec 24 22:11:38 linode kernel: Free swap  = 464220kB
Dec 24 22:11:38 linode kernel: Total swap = 524280kB
Dec 24 22:11:38 linode kernel: 92160 pages RAM
Dec 24 22:11:38 linode kernel: 3907 pages reserved
Dec 24 22:11:38 linode kernel: 56959 pages shared
Dec 24 22:11:38 linode kernel: 66407 pages non-shared
Dec 24 22:11:38 linode kernel: swapper: page allocation failure. order:0, mode:0x20
Dec 24 22:11:38 linode kernel: Pid: 0, comm: swapper Not tainted 2.6.27.4-x86_64-linode3 #1
Dec 24 22:11:38 linode kernel:
Dec 24 22:11:38 linode kernel: Call Trace:
Dec 24 22:11:38 linode kernel:  <irq>[<ffffffff8027b390>] __alloc_pages_internal+0x380/0x470
Dec 24 22:11:38 linode kernel:  [<ffffffff80299f04>] cache_alloc_refill+0x304/0x5c0
Dec 24 22:11:38 linode kernel:  [<ffffffff8029a2be>] __kmalloc+0xfe/0x110
Dec 24 22:11:38 linode kernel:  [<ffffffff80568aa8>] __alloc_skb+0x68/0x150
Dec 24 22:11:38 linode kernel:  [<ffffffff805d4397>] tcp_send_ack+0x27/0xe0
Dec 24 22:11:38 linode kernel:  [<ffffffff805d2d97>] tcp_rcv_established+0x467/0x7c0
Dec 24 22:11:38 linode kernel:  [<ffffffff805d8d8c>] tcp_v4_do_rcv+0xdc/0x220
Dec 24 22:11:38 linode kernel:  [<ffffffff8023f889>] local_bh_enable+0x79/0xb0
Dec 24 22:11:38 linode kernel:  [<ffffffff805daced>] tcp_v4_rcv+0x6ad/0x7b0
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd010>] ip_rcv_finish+0x0/0x3b0
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd484>] ip_local_deliver_finish+0xc4/0x240
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd129>] ip_rcv_finish+0x119/0x3b0
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd920>] ip_rcv+0x200/0x2f0
Dec 24 22:11:38 linode kernel:  [<ffffffff80521af2>] xennet_poll+0xab2/0xca0
Dec 24 22:11:38 linode kernel:  [<ffffffff8022134c>] pvclock_clocksource_read+0x3c/0x80
Dec 24 22:11:38 linode kernel:  [<ffffffff806a6f9b>] _spin_lock_irqsave+0x2b/0x40
Dec 24 22:11:38 linode kernel:  [<ffffffff80570644>] net_rx_action+0xb4/0x160
Dec 24 22:11:38 linode kernel:  [<ffffffff8023f353>] __do_softirq+0x83/0x100
Dec 24 22:11:38 linode kernel:  [<ffffffff8021271c>] call_softirq+0x1c/0x30
Dec 24 22:11:38 linode kernel:  [<ffffffff80214c59>] do_softirq+0x49/0x90
Dec 24 22:11:38 linode kernel:  [<ffffffff8023f2c9>] irq_exit+0x89/0x90
Dec 24 22:11:38 linode kernel:  [<ffffffff80214d51>] do_IRQ+0x81/0x100
Dec 24 22:11:38 linode kernel:  [<ffffffff804ec495>] xen_evtchn_do_upcall+0xf5/0x140
Dec 24 22:11:38 linode kernel:  [<ffffffff806a77ce>] xen_do_hypervisor_callback+0x1e/0x30
Dec 24 22:11:38 linode kernel:  <eoi>[<ffffffff802093aa>] _stext+0x3aa/0x1000
Dec 24 22:11:38 linode kernel:  [<ffffffff802093aa>] _stext+0x3aa/0x1000
Dec 24 22:11:38 linode kernel:  [<ffffffff8020e030>] xen_vcpuop_set_next_event+0x0/0x70
Dec 24 22:11:38 linode kernel:  [<ffffffff8020a67c>] xen_safe_halt+0xc/0x20
Dec 24 22:11:38 linode kernel:  [<ffffffff8020bf66>] xen_idle+0x26/0x50
Dec 24 22:11:38 linode kernel:  [<ffffffff8020f955>] cpu_idle+0x45/0x90
Dec 24 22:11:38 linode kernel:
Dec 24 22:11:38 linode kernel: Mem-Info:
Dec 24 22:11:38 linode kernel: DMA per-cpu:
Dec 24 22:11:38 linode kernel: CPU    0: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    1: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    2: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    3: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: DMA32 per-cpu:
Dec 24 22:11:38 linode kernel: CPU    0: hi:   90, btch:  15 usd:  89
Dec 24 22:11:38 linode kernel: CPU    1: hi:   90, btch:  15 usd:  88
Dec 24 22:11:38 linode kernel: CPU    2: hi:   90, btch:  15 usd:  83
Dec 24 22:11:38 linode kernel: CPU    3: hi:   90, btch:  15 usd:  40
Dec 24 22:11:38 linode kernel: Active:76415 inactive:2170 dirty:83 writeback:0 unstable:0
Dec 24 22:11:38 linode kernel:  free:541 slab:5106 mapped:17805 pagetables:1443 bounce:0
Dec 24 22:11:38 linode kernel: DMA free:1356kB min:40kB low:48kB high:60kB active:5316kB inactive:0kB present:6540kB pages_scanned:47 all_unreclaimable? no
Dec 24 22:11:38 linode kernel: lowmem_reserve[]: 0 339 339 339
Dec 24 22:11:38 linode kernel: DMA32 free:808kB min:2332kB low:2912kB high:3496kB active:300344kB inactive:8680kB present:347440kB pages_scanned:523 all_unreclaimable? no
Dec 24 22:11:38 linode kernel: lowmem_reserve[]: 0 0 0 0
Dec 24 22:11:38 linode kernel: DMA: 1*4kB 1*8kB 0*16kB 0*32kB 1*64kB 0*128kB 5*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1356kB
Dec 24 22:11:38 linode kernel: DMA32: 0*4kB 1*8kB 1*16kB 0*32kB 0*64kB 0*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 792kB
Dec 24 22:11:38 linode kernel: 25178 total pagecache pages
Dec 24 22:11:38 linode kernel: 2380 pages in swap cache
Dec 24 22:11:38 linode kernel: Swap cache stats: add 12319636, delete 12317256, find 33841123/36454188
Dec 24 22:11:38 linode kernel: Free swap  = 464220kB
Dec 24 22:11:38 linode kernel: Total swap = 524280kB
Dec 24 22:11:38 linode kernel: 92160 pages RAM
Dec 24 22:11:38 linode kernel: 3907 pages reserved
Dec 24 22:11:38 linode kernel: 56959 pages shared
Dec 24 22:11:38 linode kernel: 66407 pages non-shared
Dec 24 22:11:38 linode kernel: swapper: page allocation failure. order:0, mode:0x20
Dec 24 22:11:38 linode kernel: Pid: 0, comm: swapper Not tainted 2.6.27.4-x86_64-linode3 #1
Dec 24 22:11:38 linode kernel:
Dec 24 22:11:38 linode kernel: Call Trace:
Dec 24 22:11:38 linode kernel:  <irq>[<ffffffff8027b390>] __alloc_pages_internal+0x380/0x470
Dec 24 22:11:38 linode kernel:  [<ffffffff80299f04>] cache_alloc_refill+0x304/0x5c0
Dec 24 22:11:38 linode kernel:  [<ffffffff8029a2be>] __kmalloc+0xfe/0x110
Dec 24 22:11:38 linode kernel:  [<ffffffff80568aa8>] __alloc_skb+0x68/0x150
Dec 24 22:11:38 linode kernel:  [<ffffffff805d4397>] tcp_send_ack+0x27/0xe0
Dec 24 22:11:38 linode kernel:  [<ffffffff805d2d97>] tcp_rcv_established+0x467/0x7c0
Dec 24 22:11:38 linode kernel:  [<ffffffff805d8d8c>] tcp_v4_do_rcv+0xdc/0x220
Dec 24 22:11:38 linode kernel:  [<ffffffff8023f889>] local_bh_enable+0x79/0xb0
Dec 24 22:11:38 linode kernel:  [<ffffffff805daced>] tcp_v4_rcv+0x6ad/0x7b0
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd010>] ip_rcv_finish+0x0/0x3b0
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd484>] ip_local_deliver_finish+0xc4/0x240
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd129>] ip_rcv_finish+0x119/0x3b0
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd920>] ip_rcv+0x200/0x2f0
Dec 24 22:11:38 linode kernel:  [<ffffffff80521af2>] xennet_poll+0xab2/0xca0
Dec 24 22:11:38 linode kernel:  [<ffffffff8022134c>] pvclock_clocksource_read+0x3c/0x80
Dec 24 22:11:38 linode kernel:  [<ffffffff806a6f9b>] _spin_lock_irqsave+0x2b/0x40
Dec 24 22:11:38 linode kernel:  [<ffffffff80570644>] net_rx_action+0xb4/0x160
Dec 24 22:11:38 linode kernel:  [<ffffffff8023f353>] __do_softirq+0x83/0x100
Dec 24 22:11:38 linode kernel:  [<ffffffff8021271c>] call_softirq+0x1c/0x30
Dec 24 22:11:38 linode kernel:  [<ffffffff80214c59>] do_softirq+0x49/0x90
Dec 24 22:11:38 linode kernel:  [<ffffffff8023f2c9>] irq_exit+0x89/0x90
Dec 24 22:11:38 linode kernel:  [<ffffffff80214d51>] do_IRQ+0x81/0x100
Dec 24 22:11:38 linode kernel:  [<ffffffff804ec495>] xen_evtchn_do_upcall+0xf5/0x140
Dec 24 22:11:38 linode kernel:  [<ffffffff806a77ce>] xen_do_hypervisor_callback+0x1e/0x30
Dec 24 22:11:38 linode kernel:  <eoi>[<ffffffff802093aa>] _stext+0x3aa/0x1000
Dec 24 22:11:38 linode kernel:  [<ffffffff802093aa>] _stext+0x3aa/0x1000
Dec 24 22:11:38 linode kernel:  [<ffffffff8020e030>] xen_vcpuop_set_next_event+0x0/0x70
Dec 24 22:11:38 linode kernel:  [<ffffffff8020a67c>] xen_safe_halt+0xc/0x20
Dec 24 22:11:38 linode kernel:  [<ffffffff8020bf66>] xen_idle+0x26/0x50
Dec 24 22:11:38 linode kernel:  [<ffffffff8020f955>] cpu_idle+0x45/0x90
Dec 24 22:11:38 linode kernel:
Dec 24 22:11:38 linode kernel: Mem-Info:
Dec 24 22:11:38 linode kernel: DMA per-cpu:
Dec 24 22:11:38 linode kernel: CPU    0: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    1: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    2: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    3: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: DMA32 per-cpu:
Dec 24 22:11:38 linode kernel: CPU    0: hi:   90, btch:  15 usd:  89
Dec 24 22:11:38 linode kernel: CPU    1: hi:   90, btch:  15 usd:  88
Dec 24 22:11:38 linode kernel: CPU    2: hi:   90, btch:  15 usd:  83
Dec 24 22:11:38 linode kernel: CPU    3: hi:   90, btch:  15 usd:  40
Dec 24 22:11:38 linode kernel: Active:76415 inactive:2170 dirty:83 writeback:0 unstable:0
Dec 24 22:11:38 linode kernel:  free:541 slab:5106 mapped:17805 pagetables:1443 bounce:0
Dec 24 22:11:38 linode kernel: DMA free:1356kB min:40kB low:48kB high:60kB active:5316kB inactive:0kB present:6540kB pages_scanned:47 all_unreclaimable? no
Dec 24 22:11:38 linode kernel: lowmem_reserve[]: 0 339 339 339
Dec 24 22:11:38 linode kernel: DMA32 free:808kB min:2332kB low:2912kB high:3496kB active:300344kB inactive:8680kB present:347440kB pages_scanned:523 all_unreclaimable? no
Dec 24 22:11:38 linode kernel: lowmem_reserve[]: 0 0 0 0
Dec 24 22:11:38 linode kernel: DMA: 1*4kB 1*8kB 0*16kB 0*32kB 1*64kB 0*128kB 5*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1356kB
Dec 24 22:11:38 linode kernel: DMA32: 0*4kB 1*8kB 1*16kB 0*32kB 0*64kB 0*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 792kB
Dec 24 22:11:38 linode kernel: 25178 total pagecache pages
Dec 24 22:11:38 linode kernel: 2380 pages in swap cache
Dec 24 22:11:38 linode kernel: Swap cache stats: add 12319636, delete 12317256, find 33841123/36454188
Dec 24 22:11:38 linode kernel: Free swap  = 464220kB
Dec 24 22:11:38 linode kernel: Total swap = 524280kB
Dec 24 22:11:38 linode kernel: 92160 pages RAM
Dec 24 22:11:38 linode kernel: 3907 pages reserved
Dec 24 22:11:38 linode kernel: 56959 pages shared
Dec 24 22:11:38 linode kernel: 66407 pages non-shared
Dec 24 22:11:38 linode kernel: swapper: page allocation failure. order:0, mode:0x20
Dec 24 22:11:38 linode kernel: Pid: 0, comm: swapper Not tainted 2.6.27.4-x86_64-linode3 #1
Dec 24 22:11:38 linode kernel:
Dec 24 22:11:38 linode kernel: Call Trace:
Dec 24 22:11:38 linode kernel:  <irq>[<ffffffff8027b390>] __alloc_pages_internal+0x380/0x470
Dec 24 22:11:38 linode kernel:  [<ffffffff80299f04>] cache_alloc_refill+0x304/0x5c0
Dec 24 22:11:38 linode kernel:  [<ffffffff8029a2be>] __kmalloc+0xfe/0x110
Dec 24 22:11:38 linode kernel:  [<ffffffff80568aa8>] __alloc_skb+0x68/0x150
Dec 24 22:11:38 linode kernel:  [<ffffffff805d4397>] tcp_send_ack+0x27/0xe0
Dec 24 22:11:38 linode kernel:  [<ffffffff805d2d97>] tcp_rcv_established+0x467/0x7c0
Dec 24 22:11:38 linode kernel:  [<ffffffff805d8d8c>] tcp_v4_do_rcv+0xdc/0x220
Dec 24 22:11:38 linode kernel:  [<ffffffff8023f889>] local_bh_enable+0x79/0xb0
Dec 24 22:11:38 linode kernel:  [<ffffffff805daced>] tcp_v4_rcv+0x6ad/0x7b0
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd010>] ip_rcv_finish+0x0/0x3b0
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd484>] ip_local_deliver_finish+0xc4/0x240
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd129>] ip_rcv_finish+0x119/0x3b0
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd920>] ip_rcv+0x200/0x2f0
Dec 24 22:11:38 linode kernel:  [<ffffffff80521af2>] xennet_poll+0xab2/0xca0
Dec 24 22:11:38 linode kernel:  [<ffffffff8022134c>] pvclock_clocksource_read+0x3c/0x80
Dec 24 22:11:38 linode kernel:  [<ffffffff806a6f9b>] _spin_lock_irqsave+0x2b/0x40
Dec 24 22:11:38 linode kernel:  [<ffffffff80570644>] net_rx_action+0xb4/0x160
Dec 24 22:11:38 linode kernel:  [<ffffffff8023f353>] __do_softirq+0x83/0x100
Dec 24 22:11:38 linode kernel:  [<ffffffff8021271c>] call_softirq+0x1c/0x30
Dec 24 22:11:38 linode kernel:  [<ffffffff80214c59>] do_softirq+0x49/0x90
Dec 24 22:11:38 linode kernel:  [<ffffffff8023f2c9>] irq_exit+0x89/0x90
Dec 24 22:11:38 linode kernel:  [<ffffffff80214d51>] do_IRQ+0x81/0x100
Dec 24 22:11:38 linode kernel:  [<ffffffff804ec495>] xen_evtchn_do_upcall+0xf5/0x140
Dec 24 22:11:38 linode kernel:  [<ffffffff806a77ce>] xen_do_hypervisor_callback+0x1e/0x30
Dec 24 22:11:38 linode kernel:  <eoi>[<ffffffff802093aa>] _stext+0x3aa/0x1000
Dec 24 22:11:38 linode kernel:  [<ffffffff802093aa>] _stext+0x3aa/0x1000
Dec 24 22:11:38 linode kernel:  [<ffffffff8020e030>] xen_vcpuop_set_next_event+0x0/0x70
Dec 24 22:11:38 linode kernel:  [<ffffffff8020a67c>] xen_safe_halt+0xc/0x20
Dec 24 22:11:38 linode kernel:  [<ffffffff8020bf66>] xen_idle+0x26/0x50
Dec 24 22:11:38 linode kernel:  [<ffffffff8020f955>] cpu_idle+0x45/0x90
Dec 24 22:11:38 linode kernel:
Dec 24 22:11:38 linode kernel: Mem-Info:
Dec 24 22:11:38 linode kernel: DMA per-cpu:
Dec 24 22:11:38 linode kernel: CPU    0: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    1: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    2: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    3: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: DMA32 per-cpu:
Dec 24 22:11:38 linode kernel: CPU    0: hi:   90, btch:  15 usd:  89
Dec 24 22:11:38 linode kernel: CPU    1: hi:   90, btch:  15 usd:  88
Dec 24 22:11:38 linode kernel: CPU    2: hi:   90, btch:  15 usd:  83
Dec 24 22:11:38 linode kernel: CPU    3: hi:   90, btch:  15 usd:  40
Dec 24 22:11:38 linode kernel: Active:76415 inactive:2170 dirty:83 writeback:0 unstable:0
Dec 24 22:11:38 linode kernel:  free:541 slab:5106 mapped:17805 pagetables:1443 bounce:0
Dec 24 22:11:38 linode kernel: DMA free:1356kB min:40kB low:48kB high:60kB active:5316kB inactive:0kB present:6540kB pages_scanned:47 all_unreclaimable? no
Dec 24 22:11:38 linode kernel: lowmem_reserve[]: 0 339 339 339
Dec 24 22:11:38 linode kernel: DMA32 free:808kB min:2332kB low:2912kB high:3496kB active:300344kB inactive:8680kB present:347440kB pages_scanned:523 all_unreclaimable? no
Dec 24 22:11:38 linode kernel: lowmem_reserve[]: 0 0 0 0
Dec 24 22:11:38 linode kernel: DMA: 1*4kB 1*8kB 0*16kB 0*32kB 1*64kB 0*128kB 5*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1356kB
Dec 24 22:11:38 linode kernel: DMA32: 0*4kB 1*8kB 1*16kB 0*32kB 0*64kB 0*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 792kB
Dec 24 22:11:38 linode kernel: 25178 total pagecache pages
Dec 24 22:11:38 linode kernel: 2380 pages in swap cache
Dec 24 22:11:38 linode kernel: Swap cache stats: add 12319636, delete 12317256, find 33841123/36454188
Dec 24 22:11:38 linode kernel: Free swap  = 464220kB
Dec 24 22:11:38 linode kernel: Total swap = 524280kB
Dec 24 22:11:38 linode kernel: 92160 pages RAM
Dec 24 22:11:38 linode kernel: 3907 pages reserved
Dec 24 22:11:38 linode kernel: 56959 pages shared
Dec 24 22:11:38 linode kernel: 66407 pages non-shared
Dec 24 22:11:38 linode kernel: swapper: page allocation failure. order:0, mode:0x20
Dec 24 22:11:38 linode kernel: Pid: 0, comm: swapper Not tainted 2.6.27.4-x86_64-linode3 #1
Dec 24 22:11:38 linode kernel:
Dec 24 22:11:38 linode kernel: Call Trace:
Dec 24 22:11:38 linode kernel:  <irq>[<ffffffff8027b390>] __alloc_pages_internal+0x380/0x470
Dec 24 22:11:38 linode kernel:  [<ffffffff80299f04>] cache_alloc_refill+0x304/0x5c0
Dec 24 22:11:38 linode kernel:  [<ffffffff8029a2be>] __kmalloc+0xfe/0x110
Dec 24 22:11:38 linode kernel:  [<ffffffff80568aa8>] __alloc_skb+0x68/0x150
Dec 24 22:11:38 linode kernel:  [<ffffffff805d4397>] tcp_send_ack+0x27/0xe0
Dec 24 22:11:38 linode kernel:  [<ffffffff805d2d97>] tcp_rcv_established+0x467/0x7c0
Dec 24 22:11:38 linode kernel:  [<ffffffff805d8d8c>] tcp_v4_do_rcv+0xdc/0x220
Dec 24 22:11:38 linode kernel:  [<ffffffff8023f889>] local_bh_enable+0x79/0xb0
Dec 24 22:11:38 linode kernel:  [<ffffffff805daced>] tcp_v4_rcv+0x6ad/0x7b0
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd010>] ip_rcv_finish+0x0/0x3b0
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd484>] ip_local_deliver_finish+0xc4/0x240
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd129>] ip_rcv_finish+0x119/0x3b0
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd920>] ip_rcv+0x200/0x2f0
Dec 24 22:11:38 linode kernel:  [<ffffffff80521af2>] xennet_poll+0xab2/0xca0
Dec 24 22:11:38 linode kernel:  [<ffffffff8022134c>] pvclock_clocksource_read+0x3c/0x80
Dec 24 22:11:38 linode kernel:  [<ffffffff806a6f9b>] _spin_lock_irqsave+0x2b/0x40
Dec 24 22:11:38 linode kernel:  [<ffffffff80570644>] net_rx_action+0xb4/0x160
Dec 24 22:11:38 linode kernel:  [<ffffffff8023f353>] __do_softirq+0x83/0x100
Dec 24 22:11:38 linode kernel:  [<ffffffff8021271c>] call_softirq+0x1c/0x30
Dec 24 22:11:38 linode kernel:  [<ffffffff80214c59>] do_softirq+0x49/0x90
Dec 24 22:11:38 linode kernel:  [<ffffffff8023f2c9>] irq_exit+0x89/0x90
Dec 24 22:11:38 linode kernel:  [<ffffffff80214d51>] do_IRQ+0x81/0x100
Dec 24 22:11:38 linode kernel:  [<ffffffff804ec495>] xen_evtchn_do_upcall+0xf5/0x140
Dec 24 22:11:38 linode kernel:  [<ffffffff806a77ce>] xen_do_hypervisor_callback+0x1e/0x30
Dec 24 22:11:38 linode kernel:  <eoi>[<ffffffff802093aa>] _stext+0x3aa/0x1000
Dec 24 22:11:38 linode kernel:  [<ffffffff802093aa>] _stext+0x3aa/0x1000
Dec 24 22:11:38 linode kernel:  [<ffffffff8020e030>] xen_vcpuop_set_next_event+0x0/0x70
Dec 24 22:11:38 linode kernel:  [<ffffffff8020a67c>] xen_safe_halt+0xc/0x20
Dec 24 22:11:38 linode kernel:  [<ffffffff8020bf66>] xen_idle+0x26/0x50
Dec 24 22:11:38 linode kernel:  [<ffffffff8020f955>] cpu_idle+0x45/0x90
Dec 24 22:11:38 linode kernel:
Dec 24 22:11:38 linode kernel: Mem-Info:
Dec 24 22:11:38 linode kernel: DMA per-cpu:
Dec 24 22:11:38 linode kernel: CPU    0: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    1: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    2: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    3: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: DMA32 per-cpu:
Dec 24 22:11:38 linode kernel: CPU    0: hi:   90, btch:  15 usd:  89
Dec 24 22:11:38 linode kernel: CPU    1: hi:   90, btch:  15 usd:  88
Dec 24 22:11:38 linode kernel: CPU    2: hi:   90, btch:  15 usd:  83
Dec 24 22:11:38 linode kernel: CPU    3: hi:   90, btch:  15 usd:  40
Dec 24 22:11:38 linode kernel: Active:76415 inactive:2170 dirty:83 writeback:0 unstable:0
Dec 24 22:11:38 linode kernel:  free:541 slab:5106 mapped:17805 pagetables:1443 bounce:0
Dec 24 22:11:38 linode kernel: DMA free:1356kB min:40kB low:48kB high:60kB active:5316kB inactive:0kB present:6540kB pages_scanned:47 all_unreclaimable? no
Dec 24 22:11:38 linode kernel: lowmem_reserve[]: 0 339 339 339
Dec 24 22:11:38 linode kernel: DMA32 free:808kB min:2332kB low:2912kB high:3496kB active:300344kB inactive:8680kB present:347440kB pages_scanned:523 all_unreclaimable? no
Dec 24 22:11:38 linode kernel: lowmem_reserve[]: 0 0 0 0
Dec 24 22:11:38 linode kernel: DMA: 1*4kB 1*8kB 0*16kB 0*32kB 1*64kB 0*128kB 5*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1356kB
Dec 24 22:11:38 linode kernel: DMA32: 0*4kB 1*8kB 1*16kB 0*32kB 0*64kB 0*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 792kB
Dec 24 22:11:38 linode kernel: 25178 total pagecache pages
Dec 24 22:11:38 linode kernel: 2380 pages in swap cache
Dec 24 22:11:38 linode kernel: Swap cache stats: add 12319636, delete 12317256, find 33841123/36454188
Dec 24 22:11:38 linode kernel: Free swap  = 464220kB
Dec 24 22:11:38 linode kernel: Total swap = 524280kB
Dec 24 22:11:38 linode kernel: 92160 pages RAM
Dec 24 22:11:38 linode kernel: 3907 pages reserved
Dec 24 22:11:38 linode kernel: 56959 pages shared
Dec 24 22:11:38 linode kernel: 66407 pages non-shared
Dec 24 22:11:38 linode kernel: swapper: page allocation failure. order:0, mode:0x20
Dec 24 22:11:38 linode kernel: Pid: 0, comm: swapper Not tainted 2.6.27.4-x86_64-linode3 #1
Dec 24 22:11:38 linode kernel:
Dec 24 22:11:38 linode kernel: Call Trace:
Dec 24 22:11:38 linode kernel:  <irq>[<ffffffff8027b390>] __alloc_pages_internal+0x380/0x470
Dec 24 22:11:38 linode kernel:  [<ffffffff80299f04>] cache_alloc_refill+0x304/0x5c0
Dec 24 22:11:38 linode kernel:  [<ffffffff8029a2be>] __kmalloc+0xfe/0x110
Dec 24 22:11:38 linode kernel:  [<ffffffff80568aa8>] __alloc_skb+0x68/0x150
Dec 24 22:11:38 linode kernel:  [<ffffffff805d4397>] tcp_send_ack+0x27/0xe0
Dec 24 22:11:38 linode kernel:  [<ffffffff805d2d97>] tcp_rcv_established+0x467/0x7c0
Dec 24 22:11:38 linode kernel:  [<ffffffff805d8d8c>] tcp_v4_do_rcv+0xdc/0x220
Dec 24 22:11:38 linode kernel:  [<ffffffff8023f889>] local_bh_enable+0x79/0xb0
Dec 24 22:11:38 linode kernel:  [<ffffffff805daced>] tcp_v4_rcv+0x6ad/0x7b0
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd010>] ip_rcv_finish+0x0/0x3b0
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd484>] ip_local_deliver_finish+0xc4/0x240
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd129>] ip_rcv_finish+0x119/0x3b0
Dec 24 22:11:38 linode kernel:  [<ffffffff805bd920>] ip_rcv+0x200/0x2f0
Dec 24 22:11:38 linode kernel:  [<ffffffff80521af2>] xennet_poll+0xab2/0xca0
Dec 24 22:11:38 linode kernel:  [<ffffffff8022134c>] pvclock_clocksource_read+0x3c/0x80
Dec 24 22:11:38 linode kernel:  [<ffffffff806a6f9b>] _spin_lock_irqsave+0x2b/0x40
Dec 24 22:11:38 linode kernel:  [<ffffffff80570644>] net_rx_action+0xb4/0x160
Dec 24 22:11:38 linode kernel:  [<ffffffff8023f353>] __do_softirq+0x83/0x100
Dec 24 22:11:38 linode kernel:  [<ffffffff8021271c>] call_softirq+0x1c/0x30
Dec 24 22:11:38 linode kernel:  [<ffffffff80214c59>] do_softirq+0x49/0x90
Dec 24 22:11:38 linode kernel:  [<ffffffff8023f2c9>] irq_exit+0x89/0x90
Dec 24 22:11:38 linode kernel:  [<ffffffff80214d51>] do_IRQ+0x81/0x100
Dec 24 22:11:38 linode kernel:  [<ffffffff804ec495>] xen_evtchn_do_upcall+0xf5/0x140
Dec 24 22:11:38 linode kernel:  [<ffffffff806a77ce>] xen_do_hypervisor_callback+0x1e/0x30
Dec 24 22:11:38 linode kernel:  <eoi>[<ffffffff802093aa>] _stext+0x3aa/0x1000
Dec 24 22:11:38 linode kernel:  [<ffffffff802093aa>] _stext+0x3aa/0x1000
Dec 24 22:11:38 linode kernel:  [<ffffffff8020e030>] xen_vcpuop_set_next_event+0x0/0x70
Dec 24 22:11:38 linode kernel:  [<ffffffff8020a67c>] xen_safe_halt+0xc/0x20
Dec 24 22:11:38 linode kernel:  [<ffffffff8020bf66>] xen_idle+0x26/0x50
Dec 24 22:11:38 linode kernel:  [<ffffffff8020f955>] cpu_idle+0x45/0x90
Dec 24 22:11:38 linode kernel:
Dec 24 22:11:38 linode kernel: Mem-Info:
Dec 24 22:11:38 linode kernel: DMA per-cpu:
Dec 24 22:11:38 linode kernel: CPU    0: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    1: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    2: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: CPU    3: hi:    0, btch:   1 usd:   0
Dec 24 22:11:38 linode kernel: DMA32 per-cpu:
Dec 24 22:11:38 linode kernel: CPU    0: hi:   90, btch:  15 usd:  89
Dec 24 22:11:38 linode kernel: CPU    1: hi:   90, btch:  15 usd:  88
Dec 24 22:11:38 linode kernel: CPU    2: hi:   90, btch:  15 usd:  83
Dec 24 22:11:38 linode kernel: CPU    3: hi:   90, btch:  15 usd:  40
Dec 24 22:11:38 linode kernel: Active:76415 inactive:2170 dirty:83 writeback:0 unstable:0
Dec 24 22:11:38 linode kernel:  free:541 slab:5106 mapped:17805 pagetables:1443 bounce:0
Dec 24 22:11:38 linode kernel: DMA free:1356kB min:40kB low:48kB high:60kB active:5316kB inactive:0kB present:6540kB pages_scanned:47 all_unreclaimable? no
Dec 24 22:11:38 linode kernel: lowmem_reserve[]: 0 339 339 339
Dec 24 22:11:38 linode kernel: DMA32 free:808kB min:2332kB low:2912kB high:3496kB active:300344kB inactive:8680kB present:347440kB pages_scanned:523 all_unreclaimable? no
Dec 24 22:11:38 linode kernel: lowmem_reserve[]: 0 0 0 0
Dec 24 22:11:38 linode kernel: DMA: 1*4kB 1*8kB 0*16kB 0*32kB 1*64kB 0*128kB 5*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1356kB
Dec 24 22:11:38 linode kernel: DMA32: 0*4kB 1*8kB 1*16kB 0*32kB 0*64kB 0*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 792kB
Dec 24 22:11:38 linode kernel: 25178 total pagecache pages
Dec 24 22:11:38 linode kernel: 2380 pages in swap cache
Dec 24 22:11:38 linode kernel: Swap cache stats: add 12319636, delete 12317256, find 33841123/36454188
Dec 24 22:11:38 linode kernel: Free swap  = 464220kB
Dec 24 22:11:38 linode kernel: Total swap = 524280kB
Dec 24 22:11:38 linode kernel: 92160 pages RAM
Dec 24 22:11:38 linode kernel: 3907 pages reserved
Dec 24 22:11:38 linode kernel: 56959 pages shared
Dec 24 22:11:38 linode kernel: 66407 pages non-shared</ffffffff8020f955></ffffffff8020bf66></ffffffff8020a67c></ffffffff8020e030></ffffffff802093aa></ffffffff802093aa></eoi></ffffffff806a77ce></ffffffff804ec495></ffffffff80214d51></ffffffff8023f2c9></ffffffff80214c59></ffffffff8021271c></ffffffff8023f353></ffffffff80570644></ffffffff806a6f9b></ffffffff8022134c></ffffffff80521af2></ffffffff805bd920></ffffffff805bd129></ffffffff805bd484></ffffffff805bd010></ffffffff805daced></ffffffff8023f889></ffffffff805d8d8c></ffffffff805d2d97></ffffffff805d4397></ffffffff80568aa8></ffffffff8029a2be></ffffffff80299f04></ffffffff8027b390></irq></ffffffff8020f955></ffffffff8020bf66></ffffffff8020a67c></ffffffff8020e030></ffffffff802093aa></ffffffff802093aa></eoi></ffffffff806a77ce></ffffffff804ec495></ffffffff80214d51></ffffffff8023f2c9></ffffffff80214c59></ffffffff8021271c></ffffffff8023f353></ffffffff80570644></ffffffff806a6f9b></ffffffff8022134c></ffffffff80521af2></ffffffff805bd920></ffffffff805bd129></ffffffff805bd484></ffffffff805bd010></ffffffff805daced></ffffffff8023f889></ffffffff805d8d8c></ffffffff805d2d97></ffffffff805d4397></ffffffff80568aa8></ffffffff8029a2be></ffffffff80299f04></ffffffff8027b390></irq></ffffffff8020f955></ffffffff8020bf66></ffffffff8020a67c></ffffffff8020e030></ffffffff802093aa></ffffffff802093aa></eoi></ffffffff806a77ce></ffffffff804ec495></ffffffff80214d51></ffffffff8023f2c9></ffffffff80214c59></ffffffff8021271c></ffffffff8023f353></ffffffff80570644></ffffffff806a6f9b></ffffffff8022134c></ffffffff80521af2></ffffffff805bd920></ffffffff805bd129></ffffffff805bd484></ffffffff805bd010></ffffffff805daced></ffffffff8023f889></ffffffff805d8d8c></ffffffff805d2d97></ffffffff805d4397></ffffffff80568aa8></ffffffff8029a2be></ffffffff80299f04></ffffffff8027b390></irq></ffffffff8020f955></ffffffff8020bf66></ffffffff8020a67c></ffffffff8020e030></ffffffff802093aa></ffffffff802093aa></eoi></ffffffff806a77ce></ffffffff804ec495></ffffffff80214d51></ffffffff8023f2c9></ffffffff80214c59></ffffffff8021271c></ffffffff8023f353></ffffffff80570644></ffffffff806a6f9b></ffffffff8022134c></ffffffff80521af2></ffffffff805bd920></ffffffff805bd129></ffffffff805bd484></ffffffff805bd010></ffffffff805daced></ffffffff8023f889></ffffffff805d8d8c></ffffffff805d2d97></ffffffff805d4397></ffffffff80568aa8></ffffffff8029a2be></ffffffff80299f04></ffffffff8027b390></irq></ffffffff8020f955></ffffffff8020bf66></ffffffff8020a67c></ffffffff8020e030></ffffffff802093aa></ffffffff802093aa></eoi></ffffffff806a77ce></ffffffff804ec495></ffffffff80214d51></ffffffff8023f2c9></ffffffff80214c59></ffffffff8021271c></ffffffff8023f353></ffffffff80570644></ffffffff806a6f9b></ffffffff8022134c></ffffffff80521af2></ffffffff805bd920></ffffffff805bd129></ffffffff805bd484></ffffffff805bd010></ffffffff805daced></ffffffff8023f889></ffffffff805d8d8c></ffffffff805d2d97></ffffffff805d4397></ffffffff80568aa8></ffffffff8029a2be></ffffffff80299f04></ffffffff8027b390></irq></ffffffff8020f955></ffffffff8020bf66>

3 Replies

Known linux kernel bug: http://lkml.org/lkml/2008/12/4/68.

The net effect is a few packets get dropped in some rare cases, and the kernel shouts about it on the kernel log a bit. It's mostly harmless, as long as it doesn't happen too frequently.

Thanks!

I have swappiness set to 10 (my system almost always runs with no swap taking place); do you think that raising it closer to the default 60 would be a good idea?

@mikeage:

I have swappiness set to 10 (my system almost always runs with no swap taking place); do you think that raising it closer to the default 60 would be a good idea?
No. Why swap out things like apache when the server is idle? All you achieve is a delay when the app is next required. I've run my Linode (which, like yours, almost never swaps) at swappiness = 0 for several years.

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