RT-AX88U Crashing - Crashlog

[Szadzik]

Hi Everyone,

My RT-AX88U is crashing a few times a day. What I noticed that these collide with my audio conference start times - Teams.

I have the AX-88 connected to my fiber modem and a few LAN devices, plus a AX56U as a mesh node connected via WiFi.

I reset the router to defaults and cleared NVRAM, without restoring the settings, set everything up from scratch and after a few days the issue is back.

Crashlog shows up in the logs, and I am not sure what to look for in the large amount of data. A snippet from the log.

May  5 07:05:03 crashlog: <0>Kernel panic - not syncing: Fatal exception in interrupt
May  5 07:05:03 crashlog: <2>CPU0: stopping
May  5 07:05:03 crashlog: <4>CPU: 0 PID: 2005 Comm: ahs Tainted: P      D    O    4.1.51 #4
May  5 07:05:03 crashlog: <4>Hardware name: Broadcom-v8A (DT)
May  5 07:05:03 crashlog: <0>Call trace:
May  5 07:05:03 crashlog: <4>[<ffffffc000087658>] dump_backtrace+0x0/0x150
May  5 07:05:03 crashlog: <4>[<ffffffc0000877bc>] show_stack+0x14/0x20
May  5 07:05:03 crashlog: <4>[<ffffffc000517320>] dump_stack+0x90/0xb0
May  5 07:05:03 crashlog: <4>[<ffffffc00008df10>] handle_IPI+0x190/0x1a0
May  5 07:05:03 crashlog: <4>[<ffffffc000080c68>] gic_handle_irq+0x88/0x90
May  5 07:05:03 crashlog: <4>Exception stack(0xffffffc02ccabea0 to 0xffffffc02ccabfd0)
May  5 07:05:03 crashlog: <4>bea0: 00400000 00000000 00000000 00000000 ffffffff ffffffff f6b5c060 00000000
May  5 07:05:03 crashlog: <4>bec0: f64038f1 00000000 f699dc2c 00000000 00000000 00000000 0000002c 00000000
May  5 07:05:03 crashlog: <4>bee0: 00000008 00000000 f64025c0 00000000 f699dc2c 00000000 00000000 00000000
May  5 07:05:03 crashlog: <4>bf00: 00000000 00000000 f6c197a8 00000000 00000008 00000000 f699daec 00000000
May  5 07:05:03 crashlog: <4>bf20: f64038f9 00000000 f699d5d8 00000000 f6b55248 00000000 00000000 00000000
May  5 07:05:03 crashlog: <4>bf40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
May  5 07:05:03 crashlog: <4>bf60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
May  5 07:05:03 crashlog: <4>bf80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
May  5 07:05:03 crashlog: <4>bfa0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
May  5 07:05:03 crashlog: <4>bfc0: f6b5c060 00000000 40000010 00000000
May  5 07:05:03 crashlog: <2>CPU3: stopping
May  5 07:05:03 crashlog: <4>CPU: 3 PID: 0 Comm: swapper/3 Tainted: P      D    O    4.1.51 #4
May  5 07:05:03 crashlog: <4>Hardware name: Broadcom-v8A (DT)
May  5 07:05:03 crashlog: <0>Call trace:
May  5 07:05:03 crashlog: <4>[<ffffffc000087658>] dump_backtrace+0x0/0x150
May  5 07:05:03 crashlog: <4>[<ffffffc0000877bc>] show_stack+0x14/0x20
May  5 07:05:03 crashlog: <4>[<ffffffc000517320>] dump_stack+0x90/0xb0
May  5 07:05:03 crashlog: <4>[<ffffffc00008df10>] handle_IPI+0x190/0x1a0
May  5 07:05:03 crashlog: <4>[<ffffffc000080c68>] gic_handle_irq+0x88/0x90
May  5 07:05:03 crashlog: <4>Exception stack(0xffffffc03e8d7e10 to 0xffffffc03e8d7f40)
May  5 07:05:03 crashlog: <4>7e00:                                     006fb000 ffffffc0 00000000 00000080
May  5 07:05:03 crashlog: <4>7e20: 3e8d7f60 ffffffc0 000c6358 ffffffc0 00000001 00000000 00000000 00000000
May  5 07:05:03 crashlog: <4>7e40: 3ffe1804 ffffffc0 0070c540 ffffffc0 3e8d7ed0 ffffffc0 006fb980 ffffffc0
May  5 07:05:03 crashlog: <4>7e60: f0000000 0024e893 3dd8f4e8 ffffffc0 3e8c3070 ffffffc0 3e8d7ec0 ffffffc0
May  5 07:05:03 crashlog: <4>7e80: 0052a548 ffffffc0 0000001b 00000000 00000000 00000000 ffc070c0 00000000
May  5 07:05:03 crashlog: <4>7ea0: 000143c8 00000000 00000000 00000000 00185ff8 ffffffc0 00000000 00000000
May  5 07:05:03 crashlog: <4>7ec0: 00000000 00000000 006fb000 ffffffc0 00525000 ffffffc0 006eb7c0 ffffffc0
May  5 07:05:03 crashlog: <4>7ee0: 3e8d7f60 ffffffc0 006ee2f0 ffffffc0 3e8d4000 ffffffc0 007bd000 ffffffc0
May  5 07:05:03 crashlog: <4>7f00: 006ef000 ffffffc0 006fb9f8 ffffffc0 0072d0c0 ffffffc0 3e8d7f60 ffffffc0
May  5 07:05:03 crashlog: <4>7f20: 000c6340 ffffffc0 3e8d7f60 ffffffc0 000c6358 ffffffc0 60000145 00000000
May  5 07:05:03 crashlog: <4>[<ffffffc000083f00>] el1_irq+0x80/0xf8
May  5 07:05:03 crashlog: <4>[<ffffffc00008d990>] secondary_start_kernel+0x150/0x178
May  5 07:05:03 crashlog: <2>CPU1: stopping
May  5 07:05:03 crashlog: <4>CPU: 1 PID: 0 Comm: swapper/1 Tainted: P      D    O    4.1.51 #4
May  5 07:05:03 crashlog: <4>Hardware name: Broadcom-v8A (DT)
May  5 07:05:03 crashlog: <0>Call trace:
May  5 07:05:03 crashlog: <4>[<ffffffc000087658>] dump_backtrace+0x0/0x150
May  5 07:05:03 crashlog: <4>[<ffffffc0000877bc>] show_stack+0x14/0x20
May  5 07:05:03 crashlog: <4>[<ffffffc000517320>] dump_stack+0x90/0xb0
May  5 07:05:03 crashlog: <4>[<ffffffc00008df10>] handle_IPI+0x190/0x1a0
May  5 07:05:03 crashlog: <4>[<ffffffc000080c68>] gic_handle_irq+0x88/0x90
May  5 07:05:03 crashlog: <4>Exception stack(0xffffffc03e8cbe10 to 0xffffffc03e8cbf40)
May  5 07:05:03 crashlog: <4>be00:                                     006fb000 ffffffc0 00000000 00000080
May  5 07:05:03 crashlog: <4>be20: 3e8cbf60 ffffffc0 000c6368 ffffffc0 00000001 00000000 00000000 00000000
May  5 07:05:03 crashlog: <4>be40: 3ffc3804 ffffffc0 0070c540 ffffffc0 3e8cbed0 ffffffc0 006fb980 ffffffc0
May  5 07:05:03 crashlog: <4>be60: b0000000 002a9229 d146f9e4 0000059f 3e8b2630 ffffffc0 3e8cbec0 ffffffc0
May  5 07:05:03 crashlog: <4>be80: ff80797c 00000000 00031104 00000000 00000000 00000000 ff807130 00000000
May  5 07:05:03 crashlog: <4>bea0: 000129b8 00000000 00000000 00000000 003f76b0 ffffffc0 00000000 00000000
May  5 07:05:03 crashlog: <4>bec0: 00000000 00000000 006fb000 ffffffc0 00525000 ffffffc0 006eb7c0 ffffffc0
May  5 07:05:03 crashlog: <4>bee0: 3e8cbf60 ffffffc0 006ee2f0 ffffffc0 3e8c8000 ffffffc0 007bd000 ffffffc0
May  5 07:05:03 crashlog: <4>bf00: 006ef000 ffffffc0 006fb9f8 ffffffc0 0072d0c0 ffffffc0 3e8cbf60 ffffffc0
May  5 07:05:03 crashlog: <4>bf20: 000c6340 ffffffc0 3e8cbf60 ffffffc0 000c6368 ffffffc0 60000145 00000000
May  5 07:05:03 crashlog: <4>[<ffffffc000083f00>] el1_irq+0x80/0xf8
May  5 07:05:03 crashlog: <4>[<ffffffc00008d990>] secondary_start_kernel+0x150/0x178

May 5 07:05:03 crashlog: <0>Kernel panic - not syncing: Fatal exception in interrupt
May 5 07:05:03 crashlog: <2>CPU3: stopping[/CODE]

 

[strunker]

Asus routers use an old Linux kernel that has a lot of bugs in it. I wouldnt be surprised if you see this occur from time to time its the equivalent to a blue screen on windows.

 

[Szadzik]

Asus routers use an old Linux kernel that has a lot of bugs in it. I wouldn't be surprised if you see this occur from time to time its the equivalent to a blue screen on windows.

I've been using the router for 2 years now and never had this issue before. Now it happens 2-5 times a day.

 

[Gregory Phillips]

Is your unit getting hot when this happens? Every Asus router I've ever had that went bad started heating up as it failed.

 

[Szadzik]

Is your unit getting hot when this happens? Every Asus router I've ever had that went bad started heating up as it failed.

Good question, i have not checked. I will check next time it happens.

So far I've set up QoS to WfH and am watching this thread, as well

 

[Szadzik]

Is your unit getting hot when this happens? Every Asus router I've ever had that went bad started heating up as it failed.

Nope, not at all. Another reset today, according to Asus recommendation here [Wireless Router] ASUS router Hard Factory Reset - Method 2 | Official Support | ASUS Global

 

[micbanand]

any change you are on Version 3.0.0.4.386.45934.
Had some issues on that version.
I roled back to pre version. and now on the Newest. no problems again
I have had no problems on the asuswrt Merlin

 

[Szadzik]

I think I've found the problem - RT-AX56u as a mesh node. I disconnected that, and all issues stopped, so far. Connected RP-AX56 instead and have not experienced a reboot since. Will test for another week.

An interesting thing is, that those reboots only started after I moved the AX56U to a spot 2m from where it had been sitting for 6 months.

Will continue testing and report back.

 

[Szadzik]

Still the same. The router reboots under certain conditions - my impression - higher load.

I now installed Merlin firmware to see if that helps.

 

[Szadzik]

With Merlin's firmware not a single reboot.

 

[BokoLG]

This issue started plaguing me this weekend though I'm on a pair of AX6600's.

They've been running fine for a few months and now several crash/restarts each day as you describe.

I noticed in the other thread you linked that someone proposed it was related to Fiber ONT/PPPoE settings that appear to be for CenturyLink ISP. Any chance moving either the AX56 or other settings have been helpful?