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Opened 5 years ago

Last modified 3 years ago

#13663 new defect

D-Link DIR-835 kernel panics

Reported by: atahualpa.ledesma@… Owned by: developers
Priority: highest Milestone: Chaos Calmer 15.05
Component: packages Version: Trunk
Keywords: kernel ipv6 wan6 core dump panic Cc:

Description

I've updated my D-Link DIR-835 to version BARRIER BREAKER (Bleeding Edge, r36817), every night, it would die and I had to restart it, the device didn't respond to ping or ssh, so I had to reboot it.

configured remote syslog and found this on my logs:

Jun 5 17:40:40 atax NetworkManager[903]: <info> Activation (eth0) Stage 5 of 5 (IPv6 Commit) complete.
Jun 5 17:40:45 atax ntpdate[16509]: adjust time server 91.189.94.4 offset -0.480937 sec
Jun 5 17:49:20 openwrt hostapd: wlan1: STA 10:40:f3:af:8a:38 WPA: group key handshake completed (RSN)
Jun 5 17:59:20 openwrt hostapd: wlan1: STA 10:40:f3:af:8a:38 WPA: group key handshake completed (RSN)
Jun 5 18:09:20 openwrt hostapd: wlan1: STA 10:40:f3:af:8a:38 WPA: group key handshake completed (RSN)
Jun 5 18:17:01 atax CRON[30845]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
Jun 5 18:19:20 openwrt hostapd: wlan1: STA 10:40:f3:af:8a:38 WPA: group key handshake completed (RSN)
Jun 5 18:29:20 openwrt hostapd: wlan1: STA 10:40:f3:af:8a:38 WPA: group key handshake completed (RSN)
Jun 5 18:39:20 openwrt hostapd: wlan1: STA 10:40:f3:af:az8a:38 WPA: group key handshake completed (RSN)
Jun 5 18:49:20 openwrt hostapd: wlan1: STA 10:40:f3:af:8a:38 WPA: group key handshake completed (RSN)
Jun 5 18:59:19 openwrt hostapd: wlan1: STA 10:40:f3:af:8a:38 WPA: group key handshake completed (RSN)
Jun 5 19:09:20 openwrt hostapd: wlan1: STA 10:40:f3:af:8a:38 WPA: group key handshake completed (RSN)
Jun 5 19:17:01 atax CRON[11019]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
Jun 5 19:19:20 openwrt hostapd: wlan1: STA 10:40:f3:af:8a:38 WPA: group key handshake completed (RSN)
Jun 5 19:25:31 openwrt netifd: wan6 (914): Segmentation fault (core dumped)
Jun 5 19:25:34 openwrt netifd: wan6 (914): Segmentation fault (core dumped)
Jun 5 19:25:44 openwrt kernel: [13547.380000] CPU 0 Unable to handle kernel paging request at virtual address 00000028, epc == 800bd4f0, ra == 800bd9f4
Jun 5 19:25:44 openwrt kernel: [13547.390000] Oops#1:
Jun 5 19:25:44 openwrt kernel: [13547.390000] Cpu 0
Jun 5 19:25:44 openwrt kernel: [13547.390000] $ 0 : 00000000 0041f16c 86eebd00 00000000
Jun 5 19:25:44 openwrt kernel: [13547.390000] $ 4 : 870137cc 873e5e80 00000000 00000004
Jun 5 19:25:44 openwrt kernel: [13547.390000] $ 8 : 00000000 00000000 00bca248 86eebe30
Jun 5 19:25:44 openwrt kernel: [13547.390000] $12 : 80000000 812d6e83 20812d81 00480000
Jun 5 19:25:44 openwrt kernel: [13547.390000] $16 : 00000000 873e5e80 00000000 870137cc
Jun 5 19:25:44 openwrt kernel: [13547.390000] $20 : 00000000 873e5e80 00000000 86eebe30
Jun 5 19:25:44 openwrt kernel: [13547.390000] $24 : 0047a2c8 775850b8
Jun 5 19:25:44 openwrt kernel: [13547.390000] $28 : 86eea000 86eebcf0 000001ff 800bd9f4
Jun 5 19:25:44 openwrt kernel: [13547.390000] Hi : 0000000a
Jun 5 19:25:44 openwrt kernel: [13547.390000] Lo : 00000050
Jun 5 19:25:44 openwrt kernel: [13547.390000] epc : 800bd4f0 do_page_cache_readahead+0x38/0x234
Jun 5 19:25:44 openwrt kernel: [13547.390000] Tainted: G O
Jun 5 19:25:44 openwrt kernel: [13547.390000] ra : 800bd9f4 ra_submit+0x28/0x34
Jun 5 19:25:44 openwrt kernel: [13547.390000] Status: 1000dc03 KERNEL EXL IE
Jun 5 19:25:44 openwrt kernel: [13547.390000] Cause : 00800008
Jun 5 19:25:44 openwrt kernel: [13547.390000] BadVA : 00000028
Jun 5 19:25:44 openwrt kernel: [13547.390000] PrId : 0001974c (MIPS 74Kc)
Jun 5 19:25:44 openwrt kernel: [13547.390000] Modules linked in: ath79_wdt ohci_hcd ledtrig_usbdev ledtrig_netdev ip6t_REJECT ip6t_rt ip6t_hbh ip6t_mh ip6t_ipv6header ip6t_frag ip6t_eui64 ip6t_ah ip6table_raw ip6table_mangle ip6table_filter ip6_tables nf_conn
Jun 5 19:25:44 openwrt kernel: [13547.390000] Process dhcpv6.script (pid: 28366, threadinfo=86eea000, task=87937608, tls=7762d440)
Jun 5 19:25:44 openwrt kernel: [13547.390000] Stack : 000000e3 87b6ecc0 8780d3c0 872d4aa0 00000001 8719c8a8 8032100c 86eebd1c
Jun 5 19:25:44 openwrt kernel: [13547.390000] 00000001 00000041 80320a40 86eebd1c 86eebd1c 00000000 00000000 873e5e80
Jun 5 19:25:44 openwrt kernel: [13547.390000] 00000000 870137cc 00000000 000001ff 00000000 86eebe30 000001ff 800bd9f4
Jun 5 19:25:44 openwrt kernel: [13547.390000] 00000000 873e5e80 00000000 870137cc 00000003 000001ff 00000000 800bdda4
Jun 5 19:25:44 openwrt kernel: [13547.390000] 872d4aa0 8780d3c0 00000000 00000000 00000000 00000001 873e5e80 800b5c2c
Jun 5 19:25:44 openwrt kernel: [13547.390000] ...
Jun 5 19:25:44 openwrt kernel: [13547.390000] Call Trace:
Jun 5 19:25:44 openwrt kernel: [13547.390000] [<800bd4f0>]
do_page_cache_readahead+0x38/0x234
Jun 5 19:25:44 openwrt kernel: [13547.390000] [<800bd9f4>] ra_submit+0x28/0x34
Jun 5 19:25:44 openwrt kernel: [13547.390000] [<800bdda4>] page_cache_sync_readahead+0x58/0x64
Jun 5 19:25:44 openwrt kernel: [13547.390000] [<800b5c2c>] generic_file_aio_read+0x300/0x73c
Jun 5 19:25:44 openwrt kernel: [13547.390000] [<800e1d78>] do_sync_read+0xa8/0xf8
Jun 5 19:25:44 openwrt kernel: [13547.390000] [<800e2654>] vfs_read+0xb4/0x14c
Jun 5 19:25:44 openwrt kernel: [13547.390000] [<800e274c>] sys_read+0x60/0xa4
Jun 5 19:25:44 openwrt kernel: [13547.390000] [<80062564>] stack_done+0x20/0x40
Jun 5 19:25:44 openwrt kernel: [13547.390000]
Jun 5 19:25:44 openwrt kernel: [13547.390000]
Jun 5 19:25:44 openwrt kernel: [13547.390000] Code: 8c830000 00a0a821 27a20010 <8c650028> 8c63002c 00808021 00c09021 00a32025 00e0a021
Jun 5 19:25:44 openwrt kernel: [13547.660000] ---[ end trace 2af18292339562b7 ]---
Jun 5 19:25:51 openwrt kernel: [13554.520000] CPU 0 Unable to handle kernel paging request at virtual address 00000028, epc == 800bd4f0, ra == 800bd9f4
Jun 5 19:25:51 openwrt kernel: [13554.540000] Oops#2:
Jun 5 19:25:51 openwrt kernel: [13554.540000] Cpu 0
Jun 5 19:25:51 openwrt kernel: [13554.540000] $ 0 : 00000000 00000001 86e0dd00 00000000
Jun 5 19:25:51 openwrt kernel: [13554.540000] $ 4 : 870137cc 87ad0f00 00000002 00000004
Jun 5 19:25:51 openwrt kernel: [13554.540000] $ 8 : 00000000 00000000 005a4248 86e0de30
Jun 5 19:25:51 openwrt kernel: [13554.540000] $12 : 80000000 77d1801c 77d18030 00480000
Jun 5 19:25:51 openwrt kernel: [13554.540000] $16 : 00000000 87ad0f00 00000002 870137cc
Jun 5 19:25:51 openwrt kernel: [13554.540000] $20 : 00000000 87ad0f00 00000002 86e0de30
Jun 5 19:25:51 openwrt kernel: [13554.540000] $24 : 0047a2c8 77cfb0b8
Jun 5 19:25:51 openwrt kernel: [13554.540000] $28 : 86e0c000 86e0dcf0 00000ba6 800bd9f4
Jun 5 19:25:51 openwrt kernel: [13554.540000] Hi : 0000001c
Jun 5 19:25:51 openwrt kernel: [13554.540000] Lo : 0000003a
Jun 5 19:25:51 openwrt kernel: [13554.540000] epc : 800bd4f0 do_page_cache_readahead+0x38/0x234
Jun 5 19:25:51 openwrt kernel: [13554.540000] Tainted: G D O
Jun 5 19:25:51 openwrt kernel: [13554.540000] ra : 800bd9f4 ra_submit+0x28/0x34
Jun 5 19:25:51 openwrt kernel: [13554.540000] Status: 1000dc03 KERNEL EXL IE
Jun 5 19:25:51 openwrt kernel: [13554.540000] Cause : 00800008
Jun 5 19:25:51 openwrt kernel: [13554.540000] BadVA : 00000028
Jun 5 19:25:51 openwrt kernel: [13554.540000] PrId : 0001974c (MIPS 74Kc)
Jun 5 19:25:51 openwrt kernel: [13554.540000] Modules linked in: ath79_wdt ohci_hcd ledtrig_usbdev ledtrig_netdev ip6t_REJECT ip6t_rt ip6t_hbh ip6t_mh ip6t_ipv6header ip6t_frag ip6t_eui64 ip6t_ah ip6table_raw ip6table_mangle ip6table_filter ip6_tables nf_conn
Jun 5 19:25:51 openwrt kernel: [13554.540000] Process dhcpv6.script (pid: 28371, threadinfo=86e0c000, task=87937a30, tls=77da3440)
Jun 5 19:25:51 openwrt kernel: [13554.540000] Stack : 00000041 87ac8a80 80320a40 872d4aa0 ffffffff 00000001 8032100c 00000000
Jun 5 19:25:51 openwrt kernel: [13554.540000] 81102198 00000000 0000000a 86e0dd1c 00000000 00000018 00000000 87ad0f00
Jun 5 19:25:51 openwrt kernel: [13554.540000] 00000002 870137cc 00000000 00000ba6 00000002 86e0de30 00000ba6 800bd9f4
Jun 5 19:25:51 openwrt kernel: [13554.540000] 00000000 87ad0f00 00000002 870137cc 00000003 00000ba6 00000002 800bdda4
Jun 5 19:25:51 openwrt kernel: [13554.540000] 80320a40 00000002 00000000 00000000 00000002 00000001 87ad0f00 800b5c2c
Jun 5 19:25:51 openwrt kernel: [13554.540000] ...
Jun 5 19:25:51 openwrt kernel: [13554.540000] Call Trace:
Jun 5 19:25:51 openwrt kernel: [13554.540000] [<800bd4f0>]
do_page_cache_readahead+0x38/0x234
Jun 5 19:25:51 openwrt kernel: [13554.540000] [<800bd9f4>] ra_submit+0x28/0x34
Jun 5 19:25:51 openwrt kernel: [13554.540000] [<800bdda4>] page_cache_sync_readahead+0x58/0x64
Jun 5 19:25:51 openwrt kernel: [13554.540000] [<800b5c2c>] generic_file_aio_read+0x300/0x73c
Jun 5 19:25:51 openwrt kernel: [13554.540000] [<800e1d78>] do_sync_read+0xa8/0xf8
Jun 5 19:25:51 openwrt kernel: [13554.540000] [<800e2654>] vfs_read+0xb4/0x14c
Jun 5 19:25:51 openwrt kernel: [13554.540000] [<800e274c>] sys_read+0x60/0xa4
Jun 5 19:25:51 openwrt kernel: [13554.540000] [<80062564>] stack_done+0x20/0x40
Jun 5 19:25:51 openwrt kernel: [13554.540000]
Jun 5 19:25:51 openwrt kernel: [13554.540000]
Jun 5 19:25:51 openwrt kernel: [13554.540000] Code: 8c830000 00a0a821 27a20010 <8c650028> 8c63002c 00808021 00c09021 00a32025 00e0a021
Jun 5 19:25:51 openwrt kernel: [13554.800000] ---[ end trace 2af18292339562b8 ]---
Jun 5 19:25:55 openwrt kernel: [13557.790000] CPU 0 Unable to handle kernel paging request at virtual address 00000028, epc == 800bd4f0, ra == 800bd9f4
Jun 5 19:25:55 openwrt netifd: wan6 (914): Segmentation fault
Jun 5 19:25:55 openwrt netifd: wan6 (914): Failed to parse message data
Jun 5 19:25:55 openwrt kernel: [13557.800000] Oops#3:
Jun 5 19:25:55 openwrt kernel: [13557.800000] Cpu 0
Jun 5 19:25:55 openwrt kernel: [13557.800000] $ 0 : 00000000 00000001 87349bf0 00000000
Jun 5 19:25:55 openwrt kernel: [13557.800000] $ 4 : 8700dbec 87b8dc80 00000000 00000004
Jun 5 19:25:55 openwrt kernel: [13557.800000] $ 8 : 00000000 00000000 86e64d00 87349d20
Jun 5 19:25:55 openwrt kernel: [13557.800000] $12 : 00000000 1f2b9a7a 0b4c95ff 7d9f0ca1
Jun 5 19:25:55 openwrt kernel: [13557.800000] $16 : 00000000 87b8dc80 00000000 8700dbec
Jun 5 19:25:55 openwrt kernel: [13557.800000] $20 : 00000000 87b8dc80 00000000 87349d20
Jun 5 19:25:55 openwrt kernel: [13557.800000] $24 : 1da04421 800d1244
Jun 5 19:25:55 openwrt kernel: [13557.800000] $28 : 87348000 87349be0 00000080 800bd9f4
Jun 5 19:25:55 openwrt kernel: [13557.800000] Hi : 00000000
Jun 5 19:25:55 openwrt kernel: [13557.800000] Lo : 00000010
Jun 5 19:25:55 openwrt kernel: [13557.800000] epc : 800bd4f0 do_page_cache_readahead+0x38/0x234
Jun 5 19:25:55 openwrt kernel: [13557.800000] Tainted: G D O
Jun 5 19:25:55 openwrt kernel: [13557.800000] ra : 800bd9f4 ra_submit+0x28/0x34
Jun 5 19:25:55 openwrt kernel: [13557.800000] Status: 1000dc03 KERNEL EXL IE
Jun 5 19:25:55 openwrt kernel: [13557.800000] Cause : 00800008
Jun 5 19:25:55 openwrt kernel: [13557.800000] BadVA : 00000028
Jun 5 19:25:55 openwrt kernel: [13557.800000] PrId : 0001974c (MIPS 74Kc)
Jun 5 19:25:55 openwrt kernel: [13557.800000] Modules linked in: ath79_wdt ohci_hcd ledtrig_usbdev ledtrig_netdev ip6t_REJECT ip6t_rt ip6t_hbh ip6t_mh ip6t_ipv6header ip6t_frag ip6t_eui64 ip6t_ah ip6table_raw ip6table_mangle ip6table_filter ip6_tables nf_conn
Jun 5 19:25:55 openwrt kernel: [13557.800000] Process jshn (pid: 28374, threadinfo=87348000, task=87b2e568, tls=77697440)
Jun 5 19:25:55 openwrt kernel: [13557.800000] Stack : 87ad5aa8 86e43044 00000001 00000001 00000000 00000029 86d5b004 00000001
Jun 5 19:25:55 openwrt kernel: [13557.800000] 879e8180 800cf4ac 00411c45 86d5b004 879e8180 86d5b004 00000000 87b8dc80
Jun 5 19:25:55 openwrt kernel: [13557.800000] 00000000 8700dbec 00000000 00000034 00000000 87349d20 00000080 800bd9f4
Jun 5 19:25:55 openwrt kernel: [13557.800000] 00000000 87b8dc80 00000000 8700dbec 00000003 00000034 00000000 800bdda4
Jun 5 19:25:55 openwrt kernel: [13557.800000] 00000000 800eaf68 86d5b004 00000029 00000000 00000001 87b8dc80 800b5c2c
Jun 5 19:25:55 openwrt kernel: [13557.800000] ...
Jun 5 19:25:55 openwrt kernel: [13557.800000] Call Trace:
Jun 5 19:25:55 openwrt kernel: [13557.800000] [<800bd4f0>]
do_page_cache_readahead+0x38/0x234
Jun 5 19:25:55 openwrt kernel: [13557.800000] [<800bd9f4>] ra_submit+0x28/0x34
Jun 5 19:25:55 openwrt kernel: [13557.800000] [<800bdda4>] page_cache_sync_readahead+0x58/0x64
Jun 5 19:25:55 openwrt kernel: [13557.800000] [<800b5c2c>] generic_file_aio_read+0x300/0x73c
Jun 5 19:25:55 openwrt kernel: [13557.800000] [<800e1d78>] do_sync_read+0xa8/0xf8
Jun 5 19:25:55 openwrt kernel: [13557.800000] [<800e2654>] vfs_read+0xb4/0x14c
Jun 5 19:25:55 openwrt kernel: [13557.800000] [<800e773c>] kernel_read+0x2c/0x40
Jun 5 19:25:55 openwrt kernel: [13557.800000] [<80122574>] load_elf_binary+0x82c/0x11c8
Jun 5 19:25:55 openwrt kernel: [13557.800000] [<800e7444>] search_binary_handler+0xa8/0x29c
Jun 5 19:25:55 openwrt kernel: [13557.800000] [<800e8980>] do_execve+0x258/0x364
Jun 5 19:25:55 openwrt kernel: [13557.800000] [<800e8cd4>] sys_execve+0x44/0x6c
Jun 5 19:25:55 openwrt kernel: [13557.800000] [<80062564>] stack_done+0x20/0x40
Jun 5 19:25:55 openwrt kernel: [13557.800000]
Jun 5 19:25:55 openwrt kernel: [13557.800000]
Jun 5 19:25:59 openwrt kernel: [13562.750000] FPU emulator disabled, make sure your toolchainwas compiled with software floating point support (soft-float)
Jun 5 19:26:01 openwrt netifd: wan6 (914): Segmentation fault (core dumped)
Jun 5 19:26:11 openwrt kernel: [13574.840000] CPU 0 Unable to handle kernel paging request at virtual address 0000a020, epc == 80174b00, ra == 800b3b2c
Jun 5 19:26:12 openwrt kernel: [13574.860000] Oops#4:
Jun 5 19:26:12 openwrt kernel: [13574.860000] Cpu 0
Jun 5 19:26:12 openwrt kernel: [13574.860000] $ 0 : 00000000 00000001 00000000 0000a021
Jun 5 19:26:12 openwrt kernel: [13574.860000] $ 4 : 0000a020 00000000 00000001 00000001
Jun 5 19:26:12 openwrt kernel: [13574.860000] $ 8 : 00000001 00000000 0074e248 8731be30
Jun 5 19:26:12 openwrt kernel: [13574.860000] $12 : 80000000 81027b20 00000000 00480000
Jun 5 19:26:12 openwrt kernel: [13574.860000] $16 : 00000000 870d83b0 00000000 870d83ac
Jun 5 19:26:12 openwrt kernel: [13574.860000] $20 : 00000000 000003fe 00000000 8731be30
Jun 5 19:26:12 openwrt kernel: [13574.860000] $24 : 0047a2c8 7710f0b8
Jun 5 19:26:12 openwrt kernel: [13574.860000] $28 : 8731a000 8731bd70 000003fe 800b3b2c
Jun 5 19:26:12 openwrt kernel: [13574.860000] Hi : 0000001a
Jun 5 19:26:12 openwrt kernel: [13574.860000] Lo : 00000027
Jun 5 19:26:12 openwrt kernel: [13574.860000] epc : 80174b00 radix_tree_lookup_element+0x34/0xa8
Jun 5 19:26:12 openwrt kernel: [13574.860000] Tainted: G D W O
Jun 5 19:26:12 openwrt kernel: [13574.860000] ra : 800b3b2c find_get_page+0x24/0xc8
Jun 5 19:26:12 openwrt kernel: [13574.860000] Status: 1000dc03 KERNEL EXL IE
Jun 5 19:26:12 openwrt kernel: [13574.860000] Cause : 00800008
Jun 5 19:26:12 openwrt kernel: [13574.860000] BadVA : 0000a020
Jun 5 19:26:12 openwrt kernel: [13574.860000] PrId : 0001974c (MIPS 74Kc)
Jun 5 19:26:12 openwrt kernel: [13574.860000] Modules linked in: ath79_wdt ohci_hcd ledtrig_usbdev ledtrig_netdev ip6t_REJECT ip6t_rt ip6t_hbh ip6t_mh ip6t_ipv6header ip6t_frag ip6t_eui64 ip6t_ah ip6table_raw ip6table_mangle ip6table_filter ip6_tables nf_conn
Jun 5 19:26:12 openwrt kernel: [13574.860000] Process dhcpv6.script (pid: 28386, threadinfo=8731a000, task=86e12990, tls=771b7440)
Jun 5 19:26:12 openwrt kernel: [13574.860000] Stack : 00000000 800eaf68 87806bf0 874d3ee0 8731be78 000003fe 87320480 800b5c08
Jun 5 19:26:12 openwrt kernel: [13574.860000] 00000000 86054023 86054024 8731be78 00000000 86054023 86054024 874d7a68
Jun 5 19:26:12 openwrt kernel: [13574.860000] 00000000 00000000 000001ff 0074e248 00000000 00000000 00000000 00000001
Jun 5 19:26:12 openwrt kernel: [13574.860000] 00000000 00000000 8731be70 00000000 26360008 873204c0 00000001 87320480
Jun 5 19:26:12 openwrt kernel: [13574.860000] 8731be38 87320480 8731bf10 fffffdee 8731be38 0000000b 00000001 7fc2a530
Jun 5 19:26:12 openwrt kernel: [13574.860000] ...
Jun 5 19:26:12 openwrt kernel: [13574.860000] Call Trace:
Jun 5 19:26:12 openwrt kernel: [13574.860000] [<80174b00>] radix_tree_lookup_element+0x34/0xa8
Jun 5 19:26:12 openwrt kernel: [13574.860000] [<800b3b2c>] find_get_page+0x24/0xc8
Jun 5 19:26:12 openwrt kernel: [13574.860000] [<800b5c08>] generic_file_aio_read+0x2dc/0x73c
Jun 5 19:26:12 openwrt kernel: [13574.860000] [<800e1d78>] do_sync_read+0xa8/0xf8
Jun 5 19:26:12 openwrt kernel: [13574.860000] [<800e2654>] vfs_read+0xb4/0x14c
Jun 5 19:26:12 openwrt kernel: [13574.860000] [<800e274c>] sys_read+0x60/0xa4
Jun 5 19:26:12 openwrt kernel: [13574.860000] [<80062564>] stack_done+0x20/0x40
Jun 5 19:26:27 atax NetworkManager[903]: <info> (eth0): carrier now OFF (device state 100, deferring action for 4 seconds)

apparently as soon as wan6 had a segmentation fault, a kernel panic happened.

I've disabled IPv6 on my WAN link and it not longer has any kernel panics.

The device is currently connected to the Comcast network, behind an Arris Cablemodem

Steps to reproduce
1) install latest trunk version to D-Link DIR-835
2) set up device to use DHCPv6
3) wait 24 hours

Attachments (0)

Change History (1)

comment:1 Changed 3 years ago by lissacoffey

*Telnet to 192.168.1.1 and set a root password, or browse to http://192.168.1.1 if LuCI is installed. The file linked above (14.07) includes the Luci web interface, but note that trunk builds will require you to manually install it (see luci.essentials). WiFi is disabled by default as well, as it is with most other OpenWrt builds.

This router also supports D-Link's recovery mode, which can be used for initial flash or recovery. See this D-link forum post for details: http://forums.dlink.com/index.php?topic=44909.msg163599#msg163599
OEM installation using TFTP
http://www.acalculator.com/payroll-deductions/how-to-calculate-payroll-taxes.html
→ generic.flashing.tftp
Upgrading OpenWrt

→ generic.sysupgrade
Flash Layout

Please check out the article Flash Layout. It contains an example and a couple of explanations.
0x000000000000-0x000000010000 : "u-boot"
0x000000010000-0x000000020000 : "nvram"
0x000000020000-0x000000fb0000 : "linux"
0x000000160000-0x000000fb0000 : "rootfs"
0x000000fb0000-0x000000fe0000 : "LANG"
0x000000fe0000-0x000000ff0000 : "MAC"
0x000000ff0000-0x000001000000 : "ART"
Bootlogs
OEM bootlog

From WikiDevi

U-Boot 1.1.4 Rev: 309 (Dec 15 2011 - 15:42:35)

U-boot DB120

DRAM: 128 MB
Top of RAM usable for U-Boot at: 88000000
Reserving 152k for U-Boot at: 87fd8000
Reserving 192k for malloc() at: 87fa8000
Reserving 44 Bytes for Board Info at: 87fa7fd4
Reserving 36 Bytes for Global Data at: 87fa7fb0
Reserving 128k for boot params() at: 87f87fb0
Stack Pointer at: 87f87f98
Now running in RAM - U-Boot at: 87fd8000
id read 0x100000ff
flash size 16MB, sector count = 256
Flash: 16 MB
Using default environment

In: serial
Out: serial
Err: serial
Net: ag934x_enet_initialize...
Fetching MAC Address from 0x87ff1ee8

wasp reset mask:c03300

WASP ----> S17 PHY *
: cfg1 0x7 cfg2 0x7114
eth0: 00:00:f0:10:00:01
athrs17_reg_init: complete
eth0 up
eth0
Hit any key to stop autoboot: 0
## Booting image at 9f020000 ...

Image Name: Linux Kernel Image
Created: 2012-01-18 13:57:55 UTC
Image Type: MIPS Linux Kernel Image (lzma compressed)
Data Size: 1280031 Bytes = 1.2 MB
Load Address: 80002000
Entry Point: 802a9e70
Verifying Checksum at 0x9f020040 ...OK
Uncompressing Kernel Image ... OK

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