Package: net-tools Version: 1.60-23 Severity: normal Hi and thanks for maintaining net-tools in Debian!
Today something very strange happened to me. I had to perform some tests which *required* network problems. In order to simulate network problems, I decided to bring the eth interface of my box down: # ifdown eth1 My /etc/network/interfaces is nothing particularly fancy: $ cat /etc/network/interfaces # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface allow-hotplug eth1 iface eth1 inet dhcp Hence, the ifdown command simply caused dhcp3-client/4.1.1-P1-9 to release the IP address and the eth interface got deconfigured. So far so good. I performed the tests (which involved attempting network connections to a remote host, and obviously the attempts had to fail and indeed failed). When the tests were completed to my satisfaction, some time had passed and I decided to bring the eth interface back up. # ifup eth1 Internet Systems Consortium DHCP Client 4.1.1-P1 Copyright 2004-2010 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ SIOCSIFFLAGS: Cannot allocate memory SIOCSIFFLAGS: Cannot allocate memory Listening on LPF/eth1/00:18:f3:05:c0:fc Sending on LPF/eth1/00:18:f3:05:c0:fc Sending on Socket/fallback receive_packet failed on eth1: Network is down DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 5 send_packet: Network is down DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 10 send_packet: Network is down DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 15 send_packet: Network is down DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 14 send_packet: Network is down DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 10 send_packet: Network is down DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 7 send_packet: Network is down No DHCPOFFERS received. No working leases in persistent database - sleeping. To my big surprise, I was not able to bring the interface up! :-( My /var/log/kern.log got filled with many error messages like the following: kernel: [27695.913716] ifconfig: page allocation failure. order:3, mode:0x4020 kernel: [27695.913722] Pid: 21600, comm: ifconfig Not tainted 2.6.32-5-amd64 #1 kernel: [27695.913725] Call Trace: kernel: [27695.913738] [<ffffffff810b9f30>] ? __alloc_pages_nodemask+0x55b/0x5cf kernel: [27695.913745] [<ffffffff81248183>] ? __netdev_alloc_skb+0x29/0x43 kernel: [27695.913752] [<ffffffff810e602e>] ? kmalloc_large_node+0x5d/0x9b kernel: [27695.913756] [<ffffffff81247595>] ? __alloc_skb+0x69/0x15a kernel: [27695.913762] [<ffffffff81016423>] ? nommu_map_page+0x0/0xa0 kernel: [27695.913766] [<ffffffff81248183>] ? __netdev_alloc_skb+0x29/0x43 kernel: [27695.913775] [<ffffffffa002a535>] ? rtl8169_rx_fill+0xac/0x15c [r8169] kernel: [27695.913780] [<ffffffffa002c3ed>] ? rtl8169_init_ring+0x68/0x97 [r8169] kernel: [27695.913786] [<ffffffffa002cc08>] ? rtl8169_open+0x7e/0x19b [r8169] kernel: [27695.913791] [<ffffffff8124fe17>] ? dev_open+0xa4/0xe6 kernel: [27695.913796] [<ffffffff8124f5e2>] ? dev_change_flags+0xaf/0x16d kernel: [27695.913801] [<ffffffff81297923>] ? devinet_ioctl+0x274/0x52d kernel: [27695.913807] [<ffffffff8123f65d>] ? sock_ioctl+0x1f2/0x216 kernel: [27695.913813] [<ffffffff810fa032>] ? vfs_ioctl+0x21/0x6c kernel: [27695.913817] [<ffffffff810fa580>] ? do_vfs_ioctl+0x48d/0x4cb kernel: [27695.913823] [<ffffffff812fd0d6>] ? do_page_fault+0x2e0/0x2fc kernel: [27695.913827] [<ffffffff810fa60f>] ? sys_ioctl+0x51/0x70 kernel: [27695.913831] [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b kernel: [27695.913835] Mem-Info: kernel: [27695.913837] Node 0 DMA per-cpu: kernel: [27695.913841] CPU 0: hi: 0, btch: 1 usd: 0 kernel: [27695.913844] CPU 1: hi: 0, btch: 1 usd: 0 kernel: [27695.913846] Node 0 DMA32 per-cpu: kernel: [27695.913850] CPU 0: hi: 186, btch: 31 usd: 72 kernel: [27695.913853] CPU 1: hi: 186, btch: 31 usd: 36 kernel: [27695.913859] active_anon:21678 inactive_anon:33316 isolated_anon:0 kernel: [27695.913861] active_file:28100 inactive_file:15390 isolated_file:0 kernel: [27695.913862] unevictable:2 dirty:19 writeback:0 unstable:0 kernel: [27695.913864] free:9384 slab_reclaimable:3659 slab_unreclaimable:3398 kernel: [27695.913865] mapped:7906 shmem:9147 pagetables:2527 bounce:0 kernel: [27695.913869] Node 0 DMA free:6192kB min:84kB low:104kB high:124kB active_anon:4kB inactive_anon:3632kB active_file:848kB inactive_file:196kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15308kB mlocked:0kB dirty:0kB writeback:0kB mapped:524kB shmem:428kB slab_reclaimable:3296kB slab_unreclaimable:1020kB kernel_stack:40kB pagetables:112kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no kernel: [27695.913884] lowmem_reserve[]: 0 473 473 473 kernel: [27695.913889] Node 0 DMA32 free:31344kB min:2736kB low:3420kB high:4104kB active_anon:86708kB inactive_anon:129632kB active_file:111552kB inactive_file:61364kB unevictable:8kB isolated(anon):0kB isolated(file):0kB present:484356kB mlocked:8kB dirty:76kB writeback:0kB mapped:31100kB shmem:36160kB slab_reclaimable:11340kB slab_unreclaimable:12572kB kernel_stack:1880kB pagetables:9996kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no kernel: [27695.913904] lowmem_reserve[]: 0 0 0 0 kernel: [27695.913909] Node 0 DMA: 478*4kB 299*8kB 116*16kB 1*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 6192kB kernel: [27695.913923] Node 0 DMA32: 2566*4kB 1670*8kB 474*16kB 4*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 31336kB kernel: [27695.913936] 66739 total pagecache pages kernel: [27695.913938] 14098 pages in swap cache kernel: [27695.913941] Swap cache stats: add 123656, delete 109558, find 24295/33496 kernel: [27695.913944] Free swap = 1753760kB kernel: [27695.913946] Total swap = 1953784kB kernel: [27695.916786] 126848 pages RAM kernel: [27695.916791] 3864 pages reserved kernel: [27695.916794] 52384 pages shared kernel: [27695.916797] 79652 pages non-shared I tried to bring the interface down and then up again: # ifdown eth1 # ifup eth1 but the problem was still there. I tried to unload and then reload the NIC kernel module: # modprobe -r r8169 # modprobe r8169 but the problem was not solved. Only after a # reboot I was able to have my network interface work again... :-( What happened? Why did ifconfig experience a page allocation failure? What did I fail to understand? What did I do the wrong way? Please help! Thanks a lot for your time. -- System Information: Debian Release: squeeze/sid APT prefers testing APT policy: (800, 'testing'), (500, 'unstable') Architecture: amd64 (x86_64) Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/bash Versions of packages net-tools depends on: ii libc6 2.11.2-6 Embedded GNU C Library: Shared lib net-tools recommends no packages. net-tools suggests no packages. -- no debconf information -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? 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