TL-WR940N kernel panic

regor · Post by **regor** » Tue Jul 16, 2013 7:04 am

Hello,
I was using Gargoyle 1.5.10 on TP-Link TL-WR940N ver1.2 (using WR941Nv4 fw) as Wireless bridge. Router was working fine but suddenly when a device connected to LAN, it has been rebooting.
I had opened the case then used PL2303 USB-TTL adapter to enter failsafe mode. And here is the log.

Code: Select all

U-Boot 1.1.4 (Mar  8 2010 - 10:35:18)

AP93 (ar7240) U-boot
DRAM:  
sri
#### TAP VALUE 1 = 8, 2 = 9
32 MB
id read 0x100000ff
flash size 4194304, sector count = 64
Flash:  4 MB
Using default environment

In:    serial
Out:   serial
Err:   serial
Net:   ag7240_enet_initialize...
No valid address in Flash. Using fixed address
: cfg1 0xf cfg2 0x7014
eth0: 00:03:7f:09:0b:ad
eth0 up
No valid address in Flash. Using fixed address
: cfg1 0xf cfg2 0x7214
eth1: 00:03:7f:09:0b:ad
ATHRS26: resetting s26
ATHRS26: s26 reset done
eth1 up
eth0, eth1
Autobooting in 1 seconds
## Booting image at 9f020000 ...
   Uncompressing Kernel Image ... OK

Starting kernel ...




OpenWrt kernel loader for AR7XXX/AR9XXX

Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>

Looking for OpenWrt image... found at 0xbf022000

Decompressing kernel... done!

Starting kernel at 80060000...


[    0.000000] Linux version 3.3.8 (eric@Osiris) (gcc version 4.6.3 20120201 (prerelease) (Linaro GCC 4.6-2012.02) ) #1 Mon May 20 16:56:31 EDT 2013
[    0.000000] bootconsole [early0] enabled
[    0.000000] CPU revision is: 00019374 (MIPS 24Kc)
[    0.000000] SoC: Atheros AR7240 rev 2
[    0.000000] Clocks: CPU:400.000MHz, DDR:400.000MHz, AHB:200.000MHz, Ref:5.000MHz
[    0.000000] Determined physical RAM map:
[    0.000000]  memory: 02000000 @ 00000000 (usable)
[    0.000000] Initrd not found or empty - disabling initrd
[    0.000000] Zone PFN ranges:
[    0.000000]   Normal   0x00000000 -> 0x00002000
[    0.000000] Movable zone start PFN for each node
[    0.000000] Early memory PFN ranges
[    0.000000]     0: 0x00000000 -> 0x00002000
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 8128
[    0.000000] Kernel command line:  board=TL-WR741ND console=ttyS0,115200 rootfstype=squashfs,jffs2 noinitrd
[    0.000000] PID hash table entries: 128 (order: -3, 512 bytes)
[    0.000000] Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
[    0.000000] Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
[    0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
[    0.000000] Writing ErrCtl register=00000000
[    0.000000] Readback ErrCtl register=00000000
[    0.000000] Memory: 29048k/32768k available (2169k kernel code, 3720k reserved, 412k data, 212k init, 0k highmem)
[    0.000000] SLUB: Genslabs=9, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] NR_IRQS:51
[    0.000000] Calibrating delay loop... 265.42 BogoMIPS (lpj=1327104)
[    0.080000] pid_max: default: 32768 minimum: 301
[    0.080000] Mount-cache hash table entries: 512
[    0.090000] NET: Registered protocol family 16
[    0.090000] gpiochip_add: registered GPIOs 0 to 17 on device: ath79
[    0.100000] MIPS: machine is TP-LINK TL-WR741ND
[    0.500000] registering PCI controller with io_map_base unset
[    0.510000] bio: create slab <bio-0> at 0
[    0.520000] PCI host bridge to bus 0000:00
[    0.520000] pci_bus 0000:00: root bus resource [mem 0x10000000-0x13ffffff]
[    0.530000] pci_bus 0000:00: root bus resource [io  0x0000]
[    0.530000] pci 0000:00:00.0: fixup device configuration
[    0.540000] pci 0000:00:00.0: BAR 0: assigned [mem 0x10000000-0x1000ffff 64bit]
[    0.540000] pci 0000:00:00.0: using irq 40 for pin 1
[    0.550000] Switching to clocksource MIPS
[    0.550000] NET: Registered protocol family 2
[    0.560000] IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.560000] TCP established hash table entries: 1024 (order: 1, 8192 bytes)
[    0.570000] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[    0.570000] TCP: Hash tables configured (established 1024 bind 1024)
[    0.580000] TCP reno registered
[    0.580000] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    0.590000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    0.600000] NET: Registered protocol family 1
[    0.620000] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.620000] JFFS2 version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[    0.640000] msgmni has been set to 56
[    0.640000] io scheduler noop registered
[    0.640000] io scheduler deadline registered (default)
[    0.650000] Serial: 8250/16550 driver, 1 ports, IRQ sharing disabled
[    0.680000] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11) is a 16550A
[    0.680000] console [ttyS0] enabled, bootconsole disabled
[    0.680000] console [ttyS0] enabled, bootconsole disabled
[    0.700000] m25p80 spi0.0: found w25q32, expected m25p80
[    0.700000] m25p80 spi0.0: w25q32 (4096 Kbytes)
[    0.710000] 5 tp-link partitions found on MTD device spi0.0
[    0.710000] Creating 5 MTD partitions on "spi0.0":
[    0.720000] 0x000000000000-0x000000020000 : "u-boot"
[    0.730000] 0x000000020000-0x000000108e00 : "kernel"
[    0.730000] mtd: partition "kernel" must either start or end on erase block boundary or be smaller than an erase block -- forcing read-only
[    0.750000] 0x000000108e00-0x0000003f0000 : "rootfs"
[    0.750000] mtd: partition "rootfs" must either start or end on erase block boundary or be smaller than an erase block -- forcing read-only
[    0.760000] mtd: partition "rootfs" set to be root filesystem
[    0.770000] mtd: partition "rootfs_data" created automatically, ofs=360000, len=90000 
[    0.780000] 0x000000360000-0x0000003f0000 : "rootfs_data"
[    0.790000] 0x0000003f0000-0x000000400000 : "art"
[    0.790000] 0x000000020000-0x0000003f0000 : "firmware"
[    0.900000] ag71xx_mdio: probed
[    0.910000] eth0: Atheros AG71xx at 0xba000000, irq 5
[    1.460000] eth0: Found an AR7240/AR9330 built-in switch
[    2.500000] eth1: Atheros AG71xx at 0xb9000000, irq 4
[    3.070000] ag71xx ag71xx.0: eth1: connected to PHY at ag71xx-mdio.0:04 [uid=004dd041, driver=Generic PHY]
[    3.080000] TCP cubic registered
[    3.080000] NET: Registered protocol family 17
[    3.080000] Bridge firewalling registered
[    3.090000] Ebtables v2.0 registered
[    3.090000] 8021q: 802.1Q VLAN Support v1.8
[    3.100000] VFS: Mounted root (squashfs filesystem) readonly on device 31:2.
[    3.110000] Freeing unused kernel memory: 212k freed
- preinit -
Press the [f] key and hit [enter] to enter failsafe mode
f
- failsafe -


BusyBox v1.19.4 (2013-05-20 16:33:46 EDT) built-in shell (ash)
Enter 'help' for a list of built-in commands.

------------------------------------------------------------------
|            _____                             _                 |
|           |  __ \                           | |                |
|           | |  \/ __ _ _ __ __ _  ___  _   _| | ___            |
|           | | __ / _` | '__/ _` |/ _ \| | | | |/ _ \           |
|           | |_\ \ (_| | | | (_| | (_) | |_| | |  __/           |
|            \____/\__,_|_|  \__, |\___/ \__, |_|\___|           |
|                             __/ |       __/ |                  |
|                            |___/       |___/                   |
|                                                                |
|----------------------------------------------------------------|
| Gargoyle version 1.5.10   | OpenWrt Attitude Adjustment branch |
| Gargoyle revision e9259ee | OpenWrt revision r36669            |
| Built May 20, 2013        | Target  ar71xx/default             |
------------------------------------------------------------------
root@(none):/# [    7.730000] eth0: link up (1000Mbps/Full duplex)
[    8.690000] CPU 0 Unable to handle kernel paging request at virtual address 0005c015, epc == 80073d60, ra == 8007455c
[    9.000000] Oops[#1]:
[    9.000000] Cpu 0
[    9.000000] $ 0   : 00000000 80320000 00000000 00000000
[    9.000000] $ 4   : 80000000 0000000b 80000000 00000000
[    9.000000] $ 8   : 00060015 00060015 81b5c180 00000001
[    9.000000] $12   : 00000005 00050015 00000001 ffffffff
[    9.000000] $16   : fffffff2 80000000 8181dee8 80320000
[    9.000000] $20   : 802d0000 818180d8 00200200 00000001
[    9.000000] $24   : 00000000 80095144                  
[    9.000000] $28   : 8181c000 8181de18 80073838 8007455c
[    9.000000] Hi    : 00000000
[    9.000000] Lo    : 00000000
[    9.000000] epc   : 80073d60 0x80073d60
[    9.000000]     Tainted: G           O
[    9.000000] ra    : 8007455c 0x8007455c
[    9.000000] Status: 1000f403    KERNEL EXL IE 
[    9.000000] Cause : 00800008
[    9.000000] BadVA : 0005c015
[    9.000000] PrId  : 00019374 (MIPS 24Kc)
[    9.000000] Modules linked in: ledtrig_timer ledtrig_default_on leds_gpio gpio_button_hotplug(O)
[    9.000000] Process preinit (pid: 1, threadinfo=8181c000, task=81818000, tls=77cb6440)
[    9.000000] Stack : fffffff6 00000001 00000000 80095144 802d8da0 81818880 fffffff2 80000000
[    9.000000]         8181dee8 00000000 00000000 818180d8 fffffff6 00000001 20000000 8007455c
[    9.000000]         81818850 8027cf7c 819dc034 8006c0c4 00000001 0000019b 00000000 00000000
[    9.000000]         81b0f1e0 8181dee8 00000000 81818000 8181df00 818180d8 fffffff6 80074a6c
[    9.000000]         81b0e990 80092bf4 01200012 00826318 81818120 7fc06350 00000000 ffffffea
[    9.000000]         ...
[    9.000000] Call Trace:[<80095144>] 0x80095144
[    9.000000] [<8007455c>] 0x8007455c
[    9.000000] [<8027cf7c>] 0x8027cf7c
[    9.000000] [<8006c0c4>] 0x8006c0c4
[    9.000000] [<80074a6c>] 0x80074a6c
[    9.000000] [<80092bf4>] 0x80092bf4
[    9.000000] [<800757dc>] 0x800757dc
[    9.000000] [<80073b80>] 0x80073b80
[    9.000000] [<8006a284>] 0x8006a284
[    9.000000] 
[    9.000000] 
[    9.000000] Code: 27de3838  02008821  8e220198 <8c420048> 24420004  c0430000  2463ffff  e0430000  1060fffc 
[    9.480000] ---[ end trace b4fd9d656293fb34 ]---
[    9.480000] CPU 0 Unable to handle kernel paging request at virtual address ffffc001, epc == 80073d60, ra == 8007455c
[    9.790000] Oops[#2]:
[    9.790000] Cpu 0
[    9.790000] $ 0   : 00000000 80320000 00000000 00000000
[    9.790000] $ 4   : 80000000 0000000b 80000000 00000000
[    9.790000] $ 8   : 00000001 00000126 819dc780 00000000
[    9.790000] $12   : ffffffff 00000000 00000001 ffffffff
[    9.790000] $16   : fffffff2 80000000 81aebee8 80320000
[    9.790000] $20   : 802d0000 81b0c928 00200200 00000001
[    9.790000] $24   : 00000000 80095290                  
[    9.790000] $28   : 81aea000 81aebe18 80073838 8007455c
[    9.790000] Hi    : 00000000
[    9.790000] Lo    : 00000000
[    9.790000] epc   : 80073d60 0x80073d60
[    9.790000]     Tainted: G      D    O
[    9.790000] ra    : 8007455c 0x8007455c
[    9.790000] Status: 1000f403    KERNEL EXL IE 
[    9.790000] Cause : 00800008
[    9.790000] BadVA : ffffc001
[    9.790000] PrId  : 00019374 (MIPS 24Kc)
[    9.790000] Modules linked in: ledtrig_timer ledtrig_default_on leds_gpio gpio_button_hotplug(O)
[    9.790000] Process preinit (pid: 391, threadinfo=81aea000, task=81b0c850, tls=77cb6440)
[    9.790000] Stack : fffffff6 00000001 00000000 80095290 00000000 00000000 fffffff2 80000000
[    9.790000]         81aebee8 00000000 00000000 81b0c928 fffffff6 00000001 20000000 8007455c
[    9.790000]         81818850 8027cf7c 81b5c034 8006c0c4 00000001 000001a0 00000001 00000000
[    9.790000]         81b0e140 81aebee8 00000000 81b0c850 81aebf00 81b0c928 fffffff6 80074a6c
[    9.790000]         81b0e140 80092bf4 01200012 008262e0 81b0c970 7fc05c00 00000000 ffffffea
[    9.790000]         ...
[    9.790000] Call Trace:[<80095290>] 0x80095290
[    9.790000] [<8007455c>] 0x8007455c
[    9.790000] [<8027cf7c>] 0x8027cf7c
[    9.790000] [<8006c0c4>] 0x8006c0c4
[    9.790000] [<80074a6c>] 0x80074a6c
[    9.790000] [<80092bf4>] 0x80092bf4
[    9.790000] [<800757dc>] 0x800757dc
[    9.790000] [<80073b80>] 0x80073b80
[    9.790000] [<8006a284>] 0x8006a284
[    9.790000] 
[    9.790000] 
[    9.790000] Code: 27de3838  02008821  8e220198 <8c420048> 24420004  c0430000  2463ffff  e0430000  1060fffc 
[   10.270000] ---[ end trace b4fd9d656293fb35 ]---
[   12.370000] Kernel panic - not syncing: Attempted to kill init!

I need your helps upgrading to OpenWrt firmware.
Thank you.

Post by **BashfulBladder** » Tue Jul 16, 2013 7:30 am

connect to the router via a wired connection.

If you can access the web gui, try to restore to defaults on the System -> Backup/Restore page

If you can't, enter failsafe mode: http://wiki.openwrt.org/doc/howto/generic.failsafe and use the mtd erase command.

If you want to flash to openwrt, you can also use the netcat method at this point. See http://wiki.openwrt.org/doc/howto/generic.sysupgrade

regor · Post by **regor** » Tue Jul 16, 2013 7:59 am

When router connected via wired connection, kernel panic occur. So I cannot reach webui, ping, netcat etc.

Tried the mtd erase command, rebooted the router. Still have the same issue.

Post by **BashfulBladder** » Tue Jul 16, 2013 9:12 am

Right, sorry, try to restore to defaults via a wireless connection.

Your only other option is failsafe mode. You need to have a wired connection for that.

You entered the mtd command in failsafe mode & it didn't work - you still have kernel panics?

How do you know you had a kernel panic in failsafe mode? It only boots to a certain stage & waits - then you telnet in & do the dirty deed. If you had a working telnet connection, then you can netcat a known working firmware or switch to OpenWrt.

regor · Post by **regor** » Tue Jul 16, 2013 2:51 pm

Right, sorry, try to restore to defaults via a wireless connection.
Wifi is not working.

Your only other option is failsafe mode. You need to have a wired connection for that.
Sure but when the wire is connected to WAN or ETH port, kernel panics then router does not respond

You entered the mtd command in failsafe mode & it didn't work - you still have kernel panics?
I have upgraded firmware to Openwrt by Kermit RS232 method. Still have kernel panics.

Code: Select all

Starting kernel ...



OpenWrt kernel loader for AR7XXX/AR9XXX
Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
Looking for OpenWrt image... found at 0xbf022000
Decompressing kernel... done!
Starting kernel at 80060000...

[    0.000000] Linux version 3.3.8 (blogic@Debian-60-squeeze-64-minimal) (gcc version 4.6.3 20120201 (prerelease) (Linaro GCC 4.6-2012.02) ) #1 Sat Mar 23 16:49:30 UTC 2013
[    0.000000] bootconsole [early0] enabled
[    0.000000] CPU revision is: 00019374 (MIPS 24Kc)
[    0.000000] SoC: Atheros AR7240 rev 2
[    0.000000] Clocks: CPU:400.000MHz, DDR:400.000MHz, AHB:200.000MHz, Ref:5.000MHz
[    0.000000] Determined physical RAM map:
[    0.000000]  memory: 02000000 @ 00000000 (usable)
[    0.000000] Initrd not found or empty - disabling initrd
[    0.000000] Zone PFN ranges:
[    0.000000]   Normal   0x00000000 -> 0x00002000
[    0.000000] Movable zone start PFN for each node
[    0.000000] Early memory PFN ranges
[    0.000000]     0: 0x00000000 -> 0x00002000
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 8128
[    0.000000] Kernel command line:  board=TL-WR741ND console=ttyS0,115200 rootfstype=squashfs,jffs2 noinitrd
[    0.000000] PID hash table entries: 128 (order: -3, 512 bytes)
[    0.000000] Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
[    0.000000] Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
[    0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
[    0.000000] Writing ErrCtl register=00000000
[    0.000000] Readback ErrCtl register=00000000
[    0.000000] Memory: 29000k/32768k available (2211k kernel code, 3768k reserved, 418k data, 212k init, 0k highmem)
[    0.000000] SLUB: Genslabs=9, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] NR_IRQS:51
[    0.000000] Calibrating delay loop... 265.42 BogoMIPS (lpj=1327104)
[    0.080000] pid_max: default: 32768 minimum: 301
[    0.080000] Mount-cache hash table entries: 512
[    0.090000] NET: Registered protocol family 16
[    0.090000] gpiochip_add: registered GPIOs 0 to 17 on device: ath79
[    0.100000] MIPS: machine is TP-LINK TL-WR741ND
[    0.500000] registering PCI controller with io_map_base unset
[    0.510000] bio: create slab <bio-0> at 0
[    0.520000] PCI host bridge to bus 0000:00
[    0.520000] pci_bus 0000:00: root bus resource [mem 0x10000000-0x13ffffff]
[    0.530000] pci_bus 0000:00: root bus resource [io  0x0000]
[    0.530000] pci 0000:00:00.0: fixup device configuration
[    0.540000] pci 0000:00:00.0: BAR 0: assigned [mem 0x10000000-0x1000ffff 64bit]
[    0.540000] pci 0000:00:00.0: using irq 40 for pin 1
[    0.550000] Switching to clocksource MIPS
[    0.550000] NET: Registered protocol family 2
[    0.560000] IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.560000] TCP established hash table entries: 1024 (order: 1, 8192 bytes)
[    0.570000] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[    0.570000] TCP: Hash tables configured (established 1024 bind 1024)
[    0.580000] TCP reno registered
[    0.580000] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    0.590000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    0.600000] NET: Registered protocol family 1
[    0.620000] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.620000] JFFS2 version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[    0.640000] msgmni has been set to 56
[    0.640000] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254)
[    0.650000] io scheduler noop registered
[    0.650000] io scheduler deadline registered (default)
[    0.660000] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[    0.690000] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11) is a 16550A
[    0.690000] console [ttyS0] enabled, bootconsole disabled
[    0.690000] console [ttyS0] enabled, bootconsole disabled
[    0.710000] m25p80 spi0.0: found w25q32, expected m25p80
[    0.720000] m25p80 spi0.0: w25q32 (4096 Kbytes)
[    0.720000] 5 tp-link partitions found on MTD device spi0.0
[    0.730000] Creating 5 MTD partitions on "spi0.0":
[    0.730000] 0x000000000000-0x000000020000 : "u-boot"
[    0.740000] 0x000000020000-0x00000010bc00 : "kernel"
[    0.740000] mtd: partition "kernel" must either start or end on erase block boundary or be smaller than an erase block -- forcing read-only
[    0.760000] 0x00000010bc00-0x0000003f0000 : "rootfs"
[    0.760000] mtd: partition "rootfs" must either start or end on erase block boundary or be smaller than an erase block -- forcing read-only
[    0.780000] mtd: partition "rootfs" set to be root filesystem
[    0.780000] mtd: partition "rootfs_data" created automatically, ofs=2E0000, len=110000
[    0.790000] 0x0000002e0000-0x0000003f0000 : "rootfs_data"
[    0.800000] 0x0000003f0000-0x000000400000 : "art"
[    0.800000] 0x000000020000-0x0000003f0000 : "firmware"
[    0.920000] ag71xx_mdio: probed
[    0.930000] eth0: Atheros AG71xx at 0xba000000, irq 5
[    1.480000] eth0: Found an AR7240/AR9330 built-in switch
[    2.520000] eth1: Atheros AG71xx at 0xb9000000, irq 4
[    3.090000] ag71xx ag71xx.0: eth1: connected to PHY at ag71xx-mdio.0:04 [uid=004dd041, driver=Generic PHY]
[    3.100000] TCP cubic registered
[    3.100000] NET: Registered protocol family 17
[    3.100000] Bridge firewalling registered
[    3.110000] 8021q: 802.1Q VLAN Support v1.8
[    3.120000] VFS: Mounted root (squashfs filesystem) readonly on device 31:2.
[    3.130000] Freeing unused kernel memory: 212k freed
- preinit -
Press the [f] key and hit [enter] to enter failsafe mode
f
- failsafe -


BusyBox v1.19.4 (2013-03-14 11:28:31 UTC) built-in shell (ash)
Enter 'help' for a list of built-in commands.

  _______                     ________        __
 |       |.-----.-----.-----.|  |  |  |.----.|  |_
 |   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
 |_______||   __|_____|__|__||________||__|  |____|
          |__| W I R E L E S S   F R E E D O M
 -----------------------------------------------------
 ATTITUDE ADJUSTMENT (12.09, r36088)
 -----------------------------------------------------
  * 1/4 oz Vodka      Pour all ingredients into mixing
  * 1/4 oz Gin        tin with ice, strain into glass.
  * 1/4 oz Amaretto
  * 1/4 oz Triple sec
  * 1/4 oz Peach schnapps
  * 1/4 oz Sour mix
  * 1 splash Cranberry juice
 -----------------------------------------------------
root@(none):/# [    7.750000] eth0: link up (1000Mbps/Full duplex)
[    8.600000] Kernel panic - not syncing: Attempted to kill init!

How do you know you had a kernel panic in failsafe mode? It only boots to a certain stage & waits - then you telnet in & do the dirty deed. If you had a working telnet connection, then you can netcat a known working firmware or switch to OpenWrt.
I am connected to device with Serial adapter. Because of both wired and wireless connection aren't working, I am not able to use telnet, netcat, tftp etc. commands.

Gargoyle Forum

TL-WR940N kernel panic

TL-WR940N kernel panic

Re: TL-WR940N kernel panic

Re: TL-WR940N kernel panic

Re: TL-WR940N kernel panic

Re: TL-WR940N kernel panic