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386.3_2+RT-AC86U+QoS+Crash?

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iManuB

iManuB

Regular Contributor
Since I have activated Adaptive QoS, I notice this in the registry (this is a small part, because it is very long. But the crash repeats itself several times):

Code: 
Aug 24 01:18:29 kernel: dcd[27498]: unhandled level 3 translation fault (11) at 0x00000000, esr 0x92000007
Aug 24 01:18:29 kernel: pgd = ffffffc0040ec000
Aug 24 01:18:29 kernel: [00000000] *pgd=0000000002f16003, *pud=0000000002f16003, *pmd=0000000005c90003, *pte=0000000000000000
Aug 24 01:18:29 kernel: CPU: 1 PID: 27498 Comm: dcd Tainted: P           O    4.1.27 #2
Aug 24 01:18:29 kernel: Hardware name: Broadcom-v8A (DT)
Aug 24 01:18:29 kernel: task: ffffffc019317440 ti: ffffffc001a48000 task.ti: ffffffc001a48000
Aug 24 01:18:29 kernel: PC is at 0xf7057f44
Aug 24 01:18:29 kernel: LR is at 0x1dd14
Aug 24 01:18:29 kernel: pc : [<00000000f7057f44>] lr : [<000000000001dd14>] pstate: 600f0010
Aug 24 01:18:29 kernel: sp : 00000000ffae2738
Aug 24 01:18:29 kernel: x12: 00000000000a2050
Aug 24 01:18:29 kernel: x11: 00000000f62ff024 x10: 00000000000a23c4
Aug 24 01:18:29 kernel: x9 : 00000000f62ff9d8 x8 : 00000000000a287c
Aug 24 01:18:29 kernel: x7 : 00000000f62ffa10 x6 : 00000000000a2876
Aug 24 01:18:29 kernel: x5 : 0000000000000000 x4 : 00000000f62ff9bc
Aug 24 01:18:29 kernel: x3 : 0000000000000000 x2 : 00000000ffae2714
Aug 24 01:18:29 kernel: x1 : 000000000007d75a x0 : 0000000000000000
Aug 24 01:31:32 kernel: dcd[28701]: unhandled level 3 translation fault (11) at 0x00000000, esr 0x92000007
Aug 24 01:31:32 kernel: pgd = ffffffc0131db000
Aug 24 01:31:32 kernel: [00000000] *pgd=0000000011c4f003, *pud=0000000011c4f003, *pmd=0000000005b15003, *pte=0000000000000000
Aug 24 01:31:32 kernel: CPU: 1 PID: 28701 Comm: dcd Tainted: P           O    4.1.27 #2
Aug 24 01:31:32 kernel: Hardware name: Broadcom-v8A (DT)
Aug 24 01:31:32 kernel: task: ffffffc01e06aa80 ti: ffffffc00c164000 task.ti: ffffffc00c164000
Aug 24 01:31:32 kernel: PC is at 0xf72a5f44
Aug 24 01:31:32 kernel: LR is at 0x1dd14
Aug 24 01:31:32 kernel: pc : [<00000000f72a5f44>] lr : [<000000000001dd14>] pstate: 600f0010
Aug 24 01:31:32 kernel: sp : 00000000ffb58058
Aug 24 01:31:32 kernel: x12: 00000000000a2050
Aug 24 01:31:32 kernel: x11: 00000000f65ff024 x10: 00000000000a23c4
Aug 24 01:31:32 kernel: x9 : 00000000f65ff9d8 x8 : 00000000000a287c
Aug 24 01:31:32 kernel: x7 : 00000000f65ffa10 x6 : 00000000000a2876
Aug 24 01:31:32 kernel: x5 : 0000000000000000 x4 : 00000000f65ff9bc
Aug 24 01:31:32 kernel: x3 : 0000000000000000 x2 : 00000000ffb58034
Aug 24 01:31:32 kernel: x1 : 000000000007d75a x0 : 0000000000000000
Aug 24 01:45:07 kernel: dcd[30094]: unhandled level 3 translation fault (11) at 0x00000000, esr 0x92000007
Aug 24 01:45:07 kernel: pgd = ffffffc005ea3000
Aug 24 01:45:07 kernel: [00000000] *pgd=00000000040ec003, *pud=00000000040ec003, *pmd=000000000b014003, *pte=0000000000000000
Aug 24 01:45:07 kernel: CPU: 1 PID: 30094 Comm: dcd Tainted: P           O    4.1.27 #2
Aug 24 01:45:07 kernel: Hardware name: Broadcom-v8A (DT)
Aug 24 01:45:07 kernel: task: ffffffc001b22bc0 ti: ffffffc015ba4000 task.ti: ffffffc015ba4000
Aug 24 01:45:07 kernel: PC is at 0xf6ebdf44
Aug 24 01:45:07 kernel: LR is at 0x1dd14
Aug 24 01:45:07 kernel: pc : [<00000000f6ebdf44>] lr : [<000000000001dd14>] pstate: 600f0010
Aug 24 01:45:07 kernel: sp : 00000000ffe2de78
Aug 24 01:45:07 kernel: x12: 00000000000a2050
Aug 24 01:45:07 kernel: x11: 00000000f61ff024 x10: 00000000000a23c4
Aug 24 01:45:07 kernel: x9 : 00000000f61ff9d8 x8 : 00000000000a287c
Aug 24 01:45:07 kernel: x7 : 00000000f61ffa10 x6 : 00000000000a2876
Aug 24 01:45:07 kernel: x5 : 0000000000000000 x4 : 00000000f61ff9bc
Aug 24 01:45:07 kernel: x3 : 0000000000000000 x2 : 00000000ffe2de54
Aug 24 01:45:07 kernel: x1 : 000000000007d75a x0 : 0000000000000000
Aug 24 01:48:56 kernel: dcd[31487]: unhandled level 3 translation fault (11) at 0x00000000, esr 0x92000007
Aug 24 01:48:56 kernel: pgd = ffffffc00c073000
Aug 24 01:48:56 kernel: [00000000] *pgd=0000000002c13003, *pud=0000000002c13003, *pmd=0000000002c7c003, *pte=0000000000000000
Aug 24 01:48:56 kernel: CPU: 1 PID: 31487 Comm: dcd Tainted: P           O    4.1.27 #2
Aug 24 01:48:56 kernel: Hardware name: Broadcom-v8A (DT)
Aug 24 01:48:56 kernel: task: ffffffc0176f4b40 ti: ffffffc004cac000 task.ti: ffffffc004cac000
Aug 24 01:48:56 kernel: PC is at 0xf7263f44
Aug 24 01:48:56 kernel: LR is at 0x1dd14
Aug 24 01:48:56 kernel: pc : [<00000000f7263f44>] lr : [<000000000001dd14>] pstate: 600f0010
Aug 24 01:48:56 kernel: sp : 00000000ffc5ce48
Aug 24 01:48:56 kernel: x12: 00000000000a2050
Aug 24 01:48:56 kernel: x11: 00000000f64ff024 x10: 00000000000a23c4
Aug 24 01:48:56 kernel: x9 : 00000000f64ff9d8 x8 : 00000000000a287c
Aug 24 01:48:56 kernel: x7 : 00000000f64ffa10 x6 : 00000000000a2876
Aug 24 01:48:56 kernel: x5 : 0000000000000000 x4 : 00000000f64ff9bc
Aug 24 01:48:56 kernel: x3 : 0000000000000000 x2 : 00000000ffc5ce24
Aug 24 01:48:56 kernel: x1 : 000000000007d75a x0 : 0000000000000000
Aug 24 01:58:34 kernel: dcd[31913]: unhandled level 3 translation fault (11) at 0x00000000, esr 0x92000007
Aug 24 01:58:34 kernel: pgd = ffffffc001c5c000
Aug 24 01:58:34 kernel: [00000000] *pgd=0000000010cb2003, *pud=0000000010cb2003, *pmd=0000000010f43003, *pte=0000000000000000
Aug 24 01:58:34 kernel: CPU: 1 PID: 31913 Comm: dcd Tainted: P           O    4.1.27 #2
Aug 24 01:58:34 kernel: Hardware name: Broadcom-v8A (DT)
Aug 24 01:58:34 kernel: task: ffffffc0192fe180 ti: ffffffc004cac000 task.ti: ffffffc004cac000
Aug 24 01:58:34 kernel: PC is at 0xf6e96f44
Aug 24 01:58:34 kernel: LR is at 0x1dd14
Aug 24 01:58:34 kernel: pc : [<00000000f6e96f44>] lr : [<000000000001dd14>] pstate: 600f0010
Aug 24 01:58:34 kernel: sp : 00000000ffe0d048
Aug 24 01:58:34 kernel: x12: 00000000000a2050
Aug 24 01:58:34 kernel: x11: 00000000f61ff024 x10: 00000000000a23c4
Aug 24 01:58:34 kernel: x9 : 00000000f61ff9d8 x8 : 00000000000a287c
Aug 24 01:58:34 kernel: x7 : 00000000f61ffa10 x6 : 00000000000a2876
Aug 24 01:58:34 kernel: x5 : 0000000000000000 x4 : 00000000f61ff9bc
Aug 24 01:58:34 kernel: x3 : 0000000000000000 x2 : 00000000ffe0d024
Aug 24 01:58:34 kernel: x1 : 000000000007d75a x0 : 0000000000000000
Aug 24 02:00:01 Skynet: [#] 40163 IPs (+0) -- 1825 Ranges Banned (+0) || 4826 Inbound -- 0 Outbound Connections Blocked! [save] [0s]
Aug 24 02:27:48 kernel: dcd[32722]: unhandled level 3 translation fault (11) at 0x00000000, esr 0x92000007
Aug 24 02:27:48 kernel: pgd = ffffffc0047a2000
Aug 24 02:27:48 kernel: [00000000] *pgd=000000000c3a9003, *pud=000000000c3a9003, *pmd=000000000319f003, *pte=0000000000000000
Aug 24 02:27:48 kernel: CPU: 1 PID: 32722 Comm: dcd Tainted: P           O    4.1.27 #2
Aug 24 02:27:48 kernel: Hardware name: Broadcom-v8A (DT)
Aug 24 02:27:48 kernel: task: ffffffc005c2f580 ti: ffffffc010f0c000 task.ti: ffffffc010f0c000
Aug 24 02:27:48 kernel: PC is at 0xf6e46f44
Aug 24 02:27:48 kernel: LR is at 0x1dd14
Aug 24 02:27:48 kernel: pc : [<00000000f6e46f44>] lr : [<000000000001dd14>] pstate: 600f0010
Aug 24 02:27:48 kernel: sp : 00000000ff835ef8
Aug 24 02:27:48 kernel: x12: 00000000000a2050
Aug 24 02:27:48 kernel: x11: 00000000f60ff024 x10: 00000000000a23c4
Aug 24 02:27:48 kernel: x9 : 00000000f60ff9d8 x8 : 00000000000a287c
Aug 24 02:27:48 kernel: x7 : 00000000f60ffa10 x6 : 00000000000a2876
Aug 24 02:27:48 kernel: x5 : 0000000000000000 x4 : 00000000f60ff9bc
Aug 24 02:27:48 kernel: x3 : 0000000000000000 x2 : 00000000ff835ed4
Aug 24 02:27:48 kernel: x1 : 000000000007d75a x0 : 0000000000000000
Aug 24 02:36:06 kernel: dcd[3513]: unhandled level 3 translation fault (11) at 0x00000000, esr 0x92000007
Aug 24 02:36:06 kernel: pgd = ffffffc010c1a000
Aug 24 02:36:06 kernel: [00000000] *pgd=00000000069ec003, *pud=00000000069ec003, *pmd=00000000191c3003, *pte=0000000000000000
Aug 24 02:36:06 kernel: CPU: 1 PID: 3513 Comm: dcd Tainted: P           O    4.1.27 #2
Aug 24 02:36:06 kernel: Hardware name: Broadcom-v8A (DT)
Aug 24 02:36:06 kernel: task: ffffffc01e06b480 ti: ffffffc004cfc000 task.ti: ffffffc004cfc000
Aug 24 02:36:06 kernel: PC is at 0xf73faf44
Aug 24 02:36:06 kernel: LR is at 0x1dd14
Aug 24 02:36:06 kernel: pc : [<00000000f73faf44>] lr : [<000000000001dd14>] pstate: 600f0010
Aug 24 02:36:06 kernel: sp : 00000000fff56f78
Aug 24 02:36:06 kernel: x12: 00000000000a2050
Aug 24 02:36:06 kernel: x11: 00000000f66ff024 x10: 00000000000a23c4
Aug 24 02:36:06 kernel: x9 : 00000000f66ff9d8 x8 : 00000000000a287c
Aug 24 02:36:06 kernel: x7 : 00000000f66ffa10 x6 : 00000000000a2876
Aug 24 02:36:06 kernel: x5 : 0000000000000000 x4 : 00000000f66ff9bc
Aug 24 02:36:06 kernel: x3 : 0000000000000000 x2 : 00000000fff56f54
Aug 24 02:36:06 kernel: x1 : 000000000007d75a x0 : 0000000000000000
Aug 24 02:46:34 kernel: dcd[4322]: unhandled level 3 translation fault (11) at 0x00000000, esr 0x92000007
Aug 24 02:46:34 kernel: pgd = ffffffc0155d9000
Aug 24 02:46:34 kernel: [00000000] *pgd=0000000011fbc003, *pud=0000000011fbc003, *pmd=0000000005c79003, *pte=0000000000000000
Aug 24 02:46:34 kernel: CPU: 1 PID: 4322 Comm: dcd Tainted: P           O    4.1.27 #2
Aug 24 02:46:34 kernel: Hardware name: Broadcom-v8A (DT)
Aug 24 02:46:34 kernel: task: ffffffc0176f4b40 ti: ffffffc002f3c000 task.ti: ffffffc002f3c000
Aug 24 02:46:34 kernel: PC is at 0xf706bf44
Aug 24 02:46:34 kernel: LR is at 0x1dd14
Aug 24 02:46:34 kernel: pc : [<00000000f706bf44>] lr : [<000000000001dd14>] pstate: 600f0010
Aug 24 02:46:34 kernel: sp : 00000000fff1c6b8
Aug 24 02:46:34 kernel: x12: 00000000000a2050
Aug 24 02:46:34 kernel: x11: 00000000f62ff024 x10: 00000000000a23c4
Aug 24 02:46:34 kernel: x9 : 00000000f62ff9d8 x8 : 00000000000a287c
Aug 24 02:46:34 kernel: x7 : 00000000f62ffa10 x6 : 00000000000a2876
Aug 24 02:46:34 kernel: x5 : 0000000000000000 x4 : 00000000f62ff9bc
Aug 24 02:46:34 kernel: x3 : 0000000000000000 x2 : 00000000fff1c694
Aug 24 02:46:34 kernel: x1 : 000000000007d75a x0 : 0000000000000000
 
I am using Adaptive QoS but with FlexQoS (from amtm) and did not observer any issues with 386 RMerlin - I am not at latest one - upgrade just when new popup.

do you have set as Auto - LAN - Switch Control -NAT Acceleration and it is showing CTF (Cut Through Forwarding) is enabled.
 
Thanks for reply.
I haven't touched anything. After the update(Reset to Default), I only enabled QoS. That's all.

Inside the Switch control, I haven't CTF.
 

Attachments

  • no-ctf.jpg
    no-ctf.jpg
    35.8 KB · Views: 119
Many old threads if you search for “dcd tainted”. Harmless but annoying. I don’t see those on my AC86U running Adaptive QoS (but not AiProtection).
 
I do not know what to say. Did I accidentally activate AiProtection? I don't know. Really! If I click on AiProtection, however, it appears disabled.
I was reading a bit on the forum and it seems to be a TrendMicro related issue. I have recently installed CakeQoS. I am not seeing any Kernel panic. I continue to monitor. In case, I do a nice factory reset.
 
I have the 200/20 connection, so I found that hardware acceleration is not needed for my connection. Kernel panic could also have been due to that. Once CakeQoS was installed, I no longer had KP.
When 386.4 comes out I'll do a nice full reset and try Adaptive QoS again, without CakeQoS and I'll see.

Thanks!
 
iManuB said:
I have the 200/20 connection, so I found that hardware acceleration is not needed for my connection. Kernel panic could also have been due to that. Once CakeQoS was installed, I no longer had KP.
When 386.4 comes out I'll do a nice full reset and try Adaptive QoS again, without CakeQoS and I'll see.

Thanks!
Click to expand...

on an ac86u with merlin 386_3.2 using adaptive qos (with flexqos on top) - no dcd tainted errors in the logs.

I have aiprotectcion on as well - and the ac86u can still saturate my 950/450 connection
 
John Davis said:
on an ac86u with merlin 386_3.2 using adaptive qos (with flexqos on top) - no dcd tainted errors in the logs.

I have aiprotectcion on as well - and the ac86u can still saturate my 950/450 connection
Click to expand...

Gotcha!
 
Last edited:
I have reset everything. Formatted the USB stick and installed Skynet+Diversion and FlexQoS.

Code: 
Aug 25 10:38:46 kernel: dcd[17491]: unhandled level 3 translation fault (11) at 0x00000000, esr 0x92000007
Aug 25 10:38:46 kernel: pgd = ffffffc011622000
Aug 25 10:38:46 kernel: [00000000] *pgd=0000000012248003, *pud=0000000012248003, *pmd=00000000125e1003, *pte=0000000000000000
Aug 25 10:38:46 kernel: CPU: 1 PID: 17491 Comm: dcd Tainted: P           O    4.1.27 #2
Aug 25 10:38:46 kernel: Hardware name: Broadcom-v8A (DT)
Aug 25 10:38:46 kernel: task: ffffffc006b195c0 ti: ffffffc00b9a0000 task.ti: ffffffc00b9a0000
Aug 25 10:38:46 kernel: PC is at 0xf742cf44
Aug 25 10:38:46 kernel: LR is at 0x1dd14
Aug 25 10:38:46 kernel: pc : [<00000000f742cf44>] lr : [<000000000001dd14>] pstate: 600f0010
Aug 25 10:38:46 kernel: sp : 00000000ffb32918
Aug 25 10:38:46 kernel: x12: 00000000000a2050
Aug 25 10:38:46 kernel: x11: 00000000f64ff024 x10: 00000000000a23c4
Aug 25 10:38:46 kernel: x9 : 00000000f64ff9d0 x8 : 00000000000a287c
Aug 25 10:38:46 kernel: x7 : 00000000f64ffa08 x6 : 00000000000a2876
Aug 25 10:38:46 kernel: x5 : 0000000000000000 x4 : 00000000f64ff9b4
Aug 25 10:38:46 kernel: x3 : 0000000000000000 x2 : 00000000ffb328f4
Aug 25 10:38:46 kernel: x1 : 000000000007d75a x0 : 0000000000000000

Could it be a hardware problem? My router, in fact, by resetting it via the WPS button for 30 seconds, does not restart automatically like my old AC3200 did, but you have to turn it off and on again. I don't wish it was always defective.
 
The dcd crashes on the RT-AC86U are a long-known issue that has existed for years. The exact cause is unknown, and there is nothing that can be done about it.
 
iManuB said:
I have reset everything. Formatted the USB stick and installed Skynet+Diversion and FlexQoS.

Code: 
Aug 25 10:38:46 kernel: dcd[17491]: unhandled level 3 translation fault (11) at 0x00000000, esr 0x92000007
Aug 25 10:38:46 kernel: pgd = ffffffc011622000
Aug 25 10:38:46 kernel: [00000000] *pgd=0000000012248003, *pud=0000000012248003, *pmd=00000000125e1003, *pte=0000000000000000
Aug 25 10:38:46 kernel: CPU: 1 PID: 17491 Comm: dcd Tainted: P           O    4.1.27 #2
Aug 25 10:38:46 kernel: Hardware name: Broadcom-v8A (DT)
Aug 25 10:38:46 kernel: task: ffffffc006b195c0 ti: ffffffc00b9a0000 task.ti: ffffffc00b9a0000
Aug 25 10:38:46 kernel: PC is at 0xf742cf44
Aug 25 10:38:46 kernel: LR is at 0x1dd14
Aug 25 10:38:46 kernel: pc : [<00000000f742cf44>] lr : [<000000000001dd14>] pstate: 600f0010
Aug 25 10:38:46 kernel: sp : 00000000ffb32918
Aug 25 10:38:46 kernel: x12: 00000000000a2050
Aug 25 10:38:46 kernel: x11: 00000000f64ff024 x10: 00000000000a23c4
Aug 25 10:38:46 kernel: x9 : 00000000f64ff9d0 x8 : 00000000000a287c
Aug 25 10:38:46 kernel: x7 : 00000000f64ffa08 x6 : 00000000000a2876
Aug 25 10:38:46 kernel: x5 : 0000000000000000 x4 : 00000000f64ff9b4
Aug 25 10:38:46 kernel: x3 : 0000000000000000 x2 : 00000000ffb328f4
Aug 25 10:38:46 kernel: x1 : 000000000007d75a x0 : 0000000000000000

Could it be a hardware problem? My router, in fact, by resetting it via the WPS button for 30 seconds, does not restart automatically like my old AC3200 did, but you have to turn it off and on again. I don't wish it was always defective.
Click to expand...
are you using Pixelserv with Diversion? if so, that'll do it. use diversion lite instead.
 
RMerlin said:
The dcd crashes on the RT-AC86U are a long-known issue that has existed for years. The exact cause is unknown, and there is nothing that can be done about it.
Click to expand...
Okay, thanks!
Jack Yaz said:
are you using Pixelserv with Diversion? if so, that'll do it. use diversion lite instead.
Click to expand...
Okay! I'll try! Thank you, Jack!
I've been using CakeQoS since this morning and haven't seen a single dcd crash. For the moment, I'll leave it like this, since I manage to have bufferbloat A +
 
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