I have server running as pppoe NAS. Tried to rename customers without dropping pppd connections first, got panic after few seconds. Panic triggerable at 2.6.30.4 and 2.6.31.4 pppoe users running on eth2 pppoe flags: 1457 root /usr/sbin/pppoe-server -I eth2 -k -L 172.16.1.1 -R 172.16.1.2 -N 253 -C gpzone -S gpzone Commands sequence that i think triggered that: ip link set eth0 down ip link set eth1 down ip link set eth2 down nameif etherx 00:16:76:8D:83:BA nameif eth0 00:19:e0:72:4a:37 nameif eth1 00:19:e0:72:4a:4b ip addr flush dev eth0 ip addr flush dev eth1 ip addr add X.X.X.X/29 dev eth0 ip addr add 192.168.2.177/24 dev eth0 ip addr add 192.168.0.1/32 dev eth1 ip addr add 127.0.0.0/8 dev lo #ip link set eth0 up ip link set eth0 up ip link set eth1 up ip link set lo up ip route add 0.0.0.0/0 via X.X.X.X [ 103.428591] r8169: eth0: link up [ 103.430360] r8169: eth1: link up [ 113.361528] BUG: unable to handle kernel NULL pointer dereference at 0000018f [ 113.361717] IP: [<f8868269>] pppoe_device_event+0x80/0x12c [pppoe] [ 113.361853] *pdpt = 000000003411a001 *pde = 0000000000000000 Oct 18 23:59:40 194.146.153.93 [ 113.362012] Oops: 0000 [#1] SMP Oct 18 23:59:40 194.146.153.93 [ 113.362166] last sysfs file: /sys/devices/virtual/vc/vcs3/dev [ 113.362246] Modules linked in: netconsole configfs act_skbedit sch_ingress sch_prio cls_flow cls_u32 em_meta cls_basic xt_dscp xt_DSCP ipt_REJECT ts_bm xt_string xt_hl ifb cls_fw sch_tbf sch_htb act_ipt act_mirred xt_MARK pppoe pppox ppp_generic slhc xt_TCPMSS xt_mark xt_tcpudp iptable_mangle iptable_nat nf_nat rtc_cmos nf_conntrack_ipv4 rtc_core nf_conntrack rtc_lib nf_defrag_ipv4 iptable_filter ip_tables x_tables 8021q garp stp llc loop sata_sil pata_atiixp pata_acpi ata_generic libata 8139cp usb_storage mtdblock mtd_blkdevs mtd sr_mod cdrom tulip r8169 sky2 via_velocity via_rhine sis900 ne2k_pci 8390 skge tg3 libphy 8139too e1000 e100 usbhid ohci_hcd uhci_hcd ehci_hcd usbcore nls_base Oct 18 23:59:40 194.146.153.93 [ 113.362344] [ 113.362344] Pid: 2858, comm: pppd Not tainted (2.6.31.4-build-0047 #7) [ 113.362344] EIP: 0060:[<f8868269>] EFLAGS: 00010286 CPU: 0 [ 113.362344] EIP is at pppoe_device_event+0x80/0x12c [pppoe] [ 113.362344] EAX: f4fbe000 EBX: ffffffff ECX: f6cea5a0 EDX: f7403680 [ 113.362344] ESI: 0000000f EDI: f6cea5e0 EBP: f4145e34 ESP: f4145e1c [ 113.362344] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 [ 113.362344] Process pppd (pid: 2858, ti=f4145000 task=f4112ff0 task.ti=f4145000) [ 113.362344] Stack: [ 113.362344] f4fbe220 f4fbe000 f6cea5a0 f886a430 fffffff5 00000000 f4145e54 c01422b3 Oct 18 23:59:40 194.146.153.93 [ 113.362344] <0> f4fbe000 00000009 f8a457d8 f4fbe000 f8850190 00001091 f4145e64 c0142361 Oct 18 23:59:40 194.146.153.93 [ 113.362344] <0> ffffffff 00000000 f4145e74 c029ffbf f4fbe000 000010d0 f4145e90 c029fa70 Oct 18 23:59:40 194.146.153.93 [ 113.362344] Call Trace: [ 113.362344] [<c01422b3>] ? notifier_call_chain+0x2b/0x4a [ 113.362344] [<c0142361>] ? raw_notifier_call_chain+0xc/0xe [ 113.362344] [<c029ffbf>] ? dev_close+0x4c/0x8c [ 113.362344] [<c029fa70>] ? dev_change_flags+0xa5/0x158 [ 113.362344] [<c02da633>] ? devinet_ioctl+0x21a/0x503 [ 113.362344] [<c02db693>] ? inet_ioctl+0x8d/0xa6 [ 113.362344] [<c0292b21>] ? sock_ioctl+0x1c8/0x1ec [ 113.362344] [<c0292959>] ? sock_ioctl+0x0/0x1ec [ 113.362344] [<c019af2b>] ? vfs_ioctl+0x22/0x69 [ 113.362344] [<c019b435>] ? do_vfs_ioctl+0x41f/0x459 [ 113.362344] [<c02934eb>] ? sys_send+0x18/0x1a [ 113.362344] [<c011942f>] ? do_page_fault+0x242/0x26f [ 113.362344] [<c019b49b>] ? sys_ioctl+0x2c/0x45 [ 113.362344] [<c0102975>] ? syscall_call+0x7/0xb [ 113.362344] Code: c9 00 00 00 89 c7 31 f6 83 c7 40 89 f8 e8 cc 60 a9 c7 8b 45 ec 05 20 02 00 00 89 45 e8 8b 4d f0 8b 1c b1 e9 8c 00 00 00 8b 45 ec Oct 18 23:59:40 194.146.153.93 83 90 01 00 00 74 08 8b 9b 8c 01 00 00 eb 79 b8 c0 a6 86 f8 Oct 18 23:59:40 194.146.153.93 [ 113.362344] EIP: [<f8868269>] pppoe_device_event+0x80/0x12c [pppoe] SS:ESP 0068:f4145e1c [ 113.362344] CR2: 000000000000018f [ 113.373124] ---[ end trace f6fe64a307e97f3b ]--- [ 113.373203] Kernel panic - not syncing: Fatal exception in interrupt [ 113.373286] Pid: 2858, comm: pppd Tainted: G D 2.6.31.4-build-0047 #7 [ 113.373379] Call Trace: [ 113.373479] [<c02fc496>] ? printk+0xf/0x11 [ 113.373561] [<c02fc3e7>] panic+0x39/0xd9 [ 113.373656] [<c01059b7>] oops_end+0x8b/0x9a [ 113.373727] [<c0118f6d>] no_context+0x13d/0x147 [ 113.373800] [<c011908a>] __bad_area_nosemaphore+0x113/0x11b [ 113.373881] [<c02953b3>] ? sock_alloc_send_pskb+0x8b/0x24a [ 113.373959] [<c0121801>] ? __wake_up_sync_key+0x3b/0x45 [ 113.374030] [<c0131967>] ? irq_exit+0x39/0x5c [ 113.374107] [<c0104393>] ? do_IRQ+0x80/0x96 [ 113.374183] [<c0102f49>] ? common_interrupt+0x29/0x30 [ 113.374259] [<c011909f>] bad_area_nosemaphore+0xd/0x10 [ 113.374348] [<c0119301>] do_page_fault+0x114/0x26f [ 113.374526] [<c01191ed>] ? do_page_fault+0x0/0x26f [ 113.374605] [<c02fe506>] error_code+0x66/0x6c [ 113.374683] [<c02d007b>] ? tcp_v4_send_ack+0xa3/0x10e [ 113.374764] [<c01191ed>] ? do_page_fault+0x0/0x26f [ 113.374850] [<f8868269>] ? pppoe_device_event+0x80/0x12c [pppoe] [ 113.374928] [<c01422b3>] notifier_call_chain+0x2b/0x4a [ 113.375012] [<c0142361>] raw_notifier_call_chain+0xc/0xe [ 113.375097] [<c029ffbf>] dev_close+0x4c/0x8c [ 113.375169] [<c029fa70>] dev_change_flags+0xa5/0x158 [ 113.375239] [<c02da633>] devinet_ioctl+0x21a/0x503 [ 113.375318] [<c02db693>] inet_ioctl+0x8d/0xa6 [ 113.375411] [<c0292b21>] sock_ioctl+0x1c8/0x1ec [ 113.375491] [<c0292959>] ? sock_ioctl+0x0/0x1ec [ 113.375574] [<c019af2b>] vfs_ioctl+0x22/0x69 [ 113.375653] [<c019b435>] do_vfs_ioctl+0x41f/0x459 [ 113.375734] [<c02934eb>] ? sys_send+0x18/0x1a [ 113.375813] [<c011942f>] ? do_page_fault+0x242/0x26f [ 113.375884] [<c019b49b>] sys_ioctl+0x2c/0x45 [ 113.375960] [<c0102975>] syscall_call+0x7/0xb [ 113.376041] Rebooting in 5 seconds.. -- To unsubscribe from this list: send the line "unsubscribe linux-ppp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
