RT-AC68U Freezing without error

[ctrlz]

I just had an issue whereby my AC68U simply "froze".

It stayed powered up but all connections to the router, wired and wireless, were lost, so no internet access from any PC, laptop, phone, etc. Wireless clients were disconnected from the wireless network and I couldn't access the router GUI from anywhere.

I powered the router off and on again and connectivity was restored. Looking at the system log, there are no events whatsoever giving any clue about what the problem was. In fact the most noticeable thing is the LACK of output to the system log in the couple of hours leading up to the issue. I normally see regular DHCP requests going back and forth all the time but these stopped completely for a while before the problem happened.

Anyone else ever experienced anything similar or know of any potential cause for this? At the time, I was transferring a backup file of around 120GB across the network, but I would hardly expect that to take the router down!

These are the last few entries in the system log before it "died" at about 16:01, and the first few lines of output after I restarted it:

Sep  4 13:40:25 dnsmasq-dhcp[750]: DHCPREQUEST(br0) 192.168.1.4 00:11:32:3c:e6:39 
Sep  4 13:40:25 dnsmasq-dhcp[750]: DHCPACK(br0) 192.168.1.4 00:11:32:3c:e6:39 Backups
Sep  4 13:40:32 dnsmasq-dhcp[750]: DHCPREQUEST(br0) 192.168.1.4 00:11:32:3c:e6:39 
Sep  4 13:40:32 dnsmasq-dhcp[750]: DHCPACK(br0) 192.168.1.4 00:11:32:3c:e6:39 Backups
Sep  4 13:40:39 dnsmasq-dhcp[750]: DHCPREQUEST(br0) 192.168.1.4 00:11:32:3c:e6:39 
Sep  4 13:40:39 dnsmasq-dhcp[750]: DHCPACK(br0) 192.168.1.4 00:11:32:3c:e6:39 Backups
Sep  4 13:40:47 dnsmasq-dhcp[750]: DHCPREQUEST(br0) 192.168.1.4 00:11:32:3c:e6:39 
Sep  4 13:40:47 dnsmasq-dhcp[750]: DHCPACK(br0) 192.168.1.4 00:11:32:3c:e6:39 Backups
Sep  4 13:41:01 dnsmasq-dhcp[750]: DHCPREQUEST(br0) 192.168.1.4 00:11:32:3c:e6:39 
Sep  4 13:41:01 dnsmasq-dhcp[750]: DHCPACK(br0) 192.168.1.4 00:11:32:3c:e6:39 Backups
Sep  4 13:41:23 dnsmasq-dhcp[750]: DHCPREQUEST(br0) 192.168.1.4 00:11:32:3c:e6:39 
Sep  4 13:41:23 dnsmasq-dhcp[750]: DHCPACK(br0) 192.168.1.4 00:11:32:3c:e6:39 Backups
Jan  1 00:00:16 syslogd started: BusyBox v1.20.2
Jan  1 00:00:16 kernel: bootconsole [earlycon0] enabled
Jan  1 00:00:16 kernel: Memory policy: ECC disabled, Data cache writealloc
Jan  1 00:00:16 kernel: MPCORE found at 19020000
Jan  1 00:00:16 kernel: PERCPU: Embedded 7 pages/cpu @c8215000 s5472 r8192 d15008 u65536
Jan  1 00:00:16 kernel: pcpu-alloc: s5472 r8192 d15008 u65536 alloc=16*4096
Jan  1 00:00:17 kernel: pcpu-alloc: [0] 0 [0] 1 
Jan  1 00:00:17 kernel: Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 60416
Jan  1 00:00:17 kernel: Kernel command line: root=/dev/mtdblock2 console=ttyS0,115200 init=/sbin/preinit earlyprintk debug
Jan  1 00:00:17 kernel: PID hash table entries: 1024 (order: 0, 4096 bytes)
Jan  1 00:00:17 kernel: Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Jan  1 00:00:17 kernel: Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Jan  1 00:00:17 kernel: Memory: 128MB 128MB = 256MB total
Jan  1 00:00:17 kernel: Memory: 254972k/254972k available, 7172k reserved, 0K highmem
Jan  1 00:00:17 kernel: Virtual kernel memory layout:
Jan  1 00:00:17 kernel:     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
Jan  1 00:00:17 kernel:     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
Jan  1 00:00:17 kernel:     DMA     : 0xf7e00000 - 0xffe00000   ( 128 MB)
Jan  1 00:00:17 kernel:     vmalloc : 0xd0800000 - 0xf0000000   ( 504 MB)
Jan  1 00:00:17 kernel:     lowmem  : 0xc0000000 - 0xd0000000   ( 256 MB)
Jan  1 00:00:17 kernel:     modules : 0xbf000000 - 0xc0000000   (  16 MB)
Jan  1 00:00:17 kernel:       .init : 0xc0008000 - 0xc003e000   ( 216 kB)
Jan  1 00:00:17 kernel:       .text : 0xc003e000 - 0xc042d000   (4028 kB)
Jan  1 00:00:17 kernel:       .data : 0xc0444000 - 0xc0467420   ( 142 kB)
Jan  1 00:00:17 kernel: SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
Jan  1 00:00:17 kernel: * Invalid signature of oopsbuf: FF-FF-FB-DE-FF-F7-FF-FE (len 4294948863)
Jan  1 00:00:17 kernel: Hierarchical RCU implementation.
Jan  1 00:00:17 kernel:     RCU-based detection of stalled CPUs is disabled.
Jan  1 00:00:17 kernel:     Verbose stalled-CPUs detection is disabled.
Jan  1 00:00:17 kernel: NR_IRQS:256
Jan  1 00:00:17 kernel: MPCORE GIC init
Jan  1 00:00:17 kernel: External imprecise Data abort at addr=0x0, fsr=0x1c06 ignored.
Jan  1 00:00:17 kernel: MPCORE Global Timer Clock 400000000Hz
Jan  1 00:00:17 kernel: Calibrating delay loop... 1599.07 BogoMIPS (lpj=7995392)
Jan  1 00:00:17 kernel: pid_max: default: 32768 minimum: 301
Jan  1 00:00:17 kernel: Mount-cache hash table entries: 512
Jan  1 00:00:17 kernel: CPU: Testing write buffer coherency: ok
Jan  1 00:00:17 kernel: MPCORE Private timer setup CPU0
Jan  1 00:00:17 kernel: Calibrating local timer... 399.856MHz.
Jan  1 00:00:17 kernel: L310: cache controller enabled 16 ways, CACHE_ID 0x410000c8, AUX_CTRL 0x7a130000
Jan  1 00:00:17 kernel: CPU1: Booted secondary processor
Jan  1 00:00:17 kernel: MPCORE Private timer setup CPU1
Jan  1 00:00:17 kernel: Brought up 2 CPUs

 

[VANT]

same for me in 87u
What FW You use ?

 

[ctrlz]

Can't believe I left that out of the OP! I'm using 378.55.3_HGG_FINAL.

 

[L&LD]

Can't believe I left that out of the OP! I'm using 378.55.3_HGG_FINAL.

Did you do a reset to factory defaults and then manually and minimally configure the router to secure it and connect to your ISP?

 

[JMaldonado]

Same problem with my RT-AC3200. Ideas anyone?

 

[ctrlz]

Well in my case, I had flashed new firmware onto my device. So although I was certain I'd followed all the correct steps, I went back to the drawing board and re-flashed it, following an excellent procedure posted by someone else here:

http://www.snbforums.com/threads/no...l-and-manual-configuration.27115/#post-205573

I think I've had around a month of uptime now with no freezes. Before, it was happening a couple of times a week and happened 3 times in one day, which was the day I decided to finally do something about it!