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Full Discussion: Linux keeps freezing on UFW BLOCK
Operating Systems Linux Linux keeps freezing on UFW BLOCK Post 303032880 by mojoman on Monday 25th of March 2019 09:50:59 PM
Old 03-25-2019
Linux keeps freezing on UFW BLOCK
Hi everyone,

I have had trouble getting several versions of Linux stable on my machine over the last few months.
I do not think the issue is with the machine. Windows ran fine on it for a long time.
The current issue is that whenever I lock the screen then come back after a long time I find it frozen.
Using ctrl-alt function keys does not work.
watchdog was running on my latest Linux install. It did catch a softlockup. It did catch something with the networking. Most likely watchdog was configured to halt the system. I then disabled watchdog by putting the following entry in sysctl.conf:
Code:
kernel.nmi_watchdog=0

After reboot, I did notice that there were watchdog processes still running:
Code:
root        13     2  0 19:56 ?        00:00:00 [watchdog/0]
root        16     2  0 19:56 ?        00:00:00 [watchdog/1]
root        22     2  0 19:56 ?        00:00:00 [watchdog/2]
root        28     2  0 19:56 ?        00:00:00 [watchdog/3]
root        34     2  0 19:56 ?        00:00:00 [watchdog/4]
root        40     2  0 19:56 ?        00:00:00 [watchdog/5]
root        46     2  0 19:56 ?        00:00:00 [watchdog/6]
root        52     2  0 19:56 ?        00:00:00 [watchdog/7]
root        58     2  0 19:56 ?        00:00:00 [watchdog/8]
root        64     2  0 19:56 ?        00:00:00 [watchdog/9]
root        70     2  0 19:56 ?        00:00:00 [watchdog/10]
root        76     2  0 19:56 ?        00:00:00 [watchdog/11]
root        82     2  0 19:56 ?        00:00:00 [watchdog/12]
root        88     2  0 19:56 ?        00:00:00 [watchdog/13]
root        94     2  0 19:56 ?        00:00:00 [watchdog/14]
root       100     2  0 19:56 ?        00:00:00 [watchdog/15]
root       127     2  0 19:56 ?        00:00:00 [watchdogd]
root     11202  3313  0 22:07 pts/0    00:00:00 grep --color=auto watchdog

Everything was running fine for a few days. Today the system froze. There are tons of lines in journalctl and the kern.log like this just before I forcibly rebooted.

Code:
Gaming-3 kernel: [10847.185615] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=01:00:5e:00:00:01:44:e9:dd:4d:5f:2c:08:00 SRC=192.168.2.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=0 DF PROTO=2

I am on a home network but there are several WIFI networks running. My parents have a home office. The network guy setup a reasonably sophisticated setup. The 192.x IP is my machines gateway. I have no idea what 224.0..0.1 is. I assume something on the network is trying to reach a device through my wireless adapter. Maybe a ping?
I just have the default rules in ufw enabled: Deny ALL incoming Allow ALL outgoing.
If I turn UFW off, disable it, my system has not frozen yet.

Turning off logging does not work. I am not surprised. Logging would just eat up disk space not freeze the kernel.

I think the problem is that either watchdog was not disabled or UFW needs to be configured properly. I disabled UFW last night yet it still seems to be running this morning. The system locked up. The last lines in kern.log are a little different though. The source and destination IP's are different. How can I stop UFW from running?
Code:
Mar 25 21:19:58 -AB350-Gaming-3 kernel: [ 5011.827670] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=01:00:5e:00:00:fb:44:e9:dd:4d:5f:32:08:00 SRC=192.168.2.1 DST=224.0.0.251 LEN=28 TOS=0x00 PREC=0x00 TTL=1 ID=17
641 DF PROTO=2 
Mar 25 21:19:58 -AB350-Gaming-3 kernel: [ 5012.749595] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=01:00:5e:00:00:fb:54:99:63:c9:a5:01:08:00 SRC=192.168.2.166 DST=224.0.0.251 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=
54661 PROTO=2 
Mar 25 21:20:11 -AB350-Gaming-3 kernel: [ 5025.241280] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=01:00:5e:00:00:01:44:e9:dd:4d:5f:2c:08:00 SRC=192.168.2.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=0 DF
 PROTO=2 
Mar 25 21:20:50 -AB350-Gaming-3 kernel: [ 5064.255654] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=01:00:5e:00:00:01:44:e9:dd:4d:5f:2c:08:00 SRC=192.168.2.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=0 DF
 PROTO=2 
Mar 25 21:21:30 -AB350-Gaming-3 kernel: [ 5104.294042] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=01:00:5e:00:00:01:44:e9:dd:4d:5f:2c:08:00 SRC=192.168.2.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=0 DF
 PROTO=2 
Mar 25 21:21:59 -AB350-Gaming-3 kernel: [ 5133.733538] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=74:da:da:97:05:18:44:e9:dd:4d:5f:32:08:00 SRC=198.252.206.25 DST=192.168.2.196 LEN=113 TOS=0x08 PREC=0x00 TTL=5
2 ID=1095 DF PROTO=TCP SPT=443 DPT=37790 WINDOW=62 RES=0x00 ACK PSH URGP=0 
Mar 25 21:22:00 -AB350-Gaming-3 kernel: [ 5133.884016] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=74:da:da:97:05:18:44:e9:dd:4d:5f:32:08:00 SRC=198.252.206.25 DST=192.168.2.196 LEN=113 TOS=0x08 PREC=0x00 TTL=5
2 ID=1096 DF PROTO=TCP SPT=443 DPT=37790 WINDOW=62 RES=0x00 ACK PSH URGP=0 
Mar 25 21:22:00 -AB350-Gaming-3 kernel: [ 5134.126893] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=74:da:da:97:05:18:44:e9:dd:4d:5f:32:08:00 SRC=198.252.206.25 DST=192.168.2.196 LEN=113 TOS=0x08 PREC=0x00 TTL=5
2 ID=1097 DF PROTO=TCP SPT=443 DPT=37790 WINDOW=62 RES=0x00 ACK PSH URGP=0 
Mar 25 21:22:00 -AB350-Gaming-3 kernel: [ 5134.729285] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=74:da:da:97:05:18:44:e9:dd:4d:5f:32:08:00 SRC=198.252.206.25 DST=192.168.2.196 LEN=113 TOS=0x08 PREC=0x00 TTL=5
2 ID=1098 DF PROTO=TCP SPT=443 DPT=37790 WINDOW=62 RES=0x00 ACK PSH URGP=0 
Mar 25 21:22:01 -AB350-Gaming-3 kernel: [ 5135.321988] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=74:da:da:97:05:18:44:e9:dd:4d:5f:32:08:00 SRC=35.160.99.21 DST=192.168.2.196 LEN=83 TOS=0x00 PREC=0x00 TTL=227 
ID=5087 DF PROTO=TCP SPT=443 DPT=52118 WINDOW=118 RES=0x00 ACK PSH URGP=0 
Mar 25 21:22:01 -AB350-Gaming-3 kernel: [ 5135.630049] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=74:da:da:97:05:18:44:e9:dd:4d:5f:32:08:00 SRC=198.252.206.25 DST=192.168.2.196 LEN=113 TOS=0x08 PREC=0x00 TTL=5
2 ID=1099 DF PROTO=TCP SPT=443 DPT=37790 WINDOW=62 RES=0x00 ACK PSH URGP=0 
Mar 25 21:22:01 -AB350-Gaming-3 kernel: [ 5135.630677] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=74:da:da:97:05:18:44:e9:dd:4d:5f:32:08:00 SRC=35.160.99.21 DST=192.168.2.196 LEN=83 TOS=0x00 PREC=0x00 TTL=227 
ID=5088 DF PROTO=TCP SPT=443 DPT=52118 WINDOW=118 RES=0x00 ACK PSH URGP=0 
Mar 25 21:22:02 -AB350-Gaming-3 kernel: [ 5136.009273] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=74:da:da:97:05:18:44:e9:dd:4d:5f:32:08:00 SRC=35.160.99.21 DST=192.168.2.196 LEN=83 TOS=0x00 PREC=0x00 TTL=227 
ID=5089 DF PROTO=TCP SPT=443 DPT=52118 WINDOW=118 RES=0x00 ACK PSH URGP=0 
Mar 25 21:22:03 -AB350-Gaming-3 kernel: [ 5136.769047] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=74:da:da:97:05:18:44:e9:dd:4d:5f:32:08:00 SRC=35.160.99.21 DST=192.168.2.196 LEN=83 TOS=0x00 PREC=0x00 TTL=227 
ID=5090 DF PROTO=TCP SPT=443 DPT=52118 WINDOW=118 RES=0x00 ACK PSH URGP=0 
Mar 25 21:22:03 -AB350-Gaming-3 kernel: [ 5137.575243] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=74:da:da:97:05:18:44:e9:dd:4d:5f:32:08:00 SRC=198.252.206.25 DST=192.168.2.196 LEN=113 TOS=0x08 PREC=0x00 TTL=5
2 ID=1100 DF PROTO=TCP SPT=443 DPT=37790 WINDOW=62 RES=0x00 ACK PSH URGP=0 
Mar 25 21:22:31 -AB350-Gaming-3 kernel: [ 5164.817546] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=74:da:da:97:05:18:44:e9:dd:4d:5f:32:08:00 SRC=198.252.206.25 DST=192.168.2.196 LEN=113 TOS=0x08 PREC=0x00 TTL=5
2 ID=1103 DF PROTO=TCP SPT=443 DPT=37790 WINDOW=62 RES=0x00 ACK PSH URGP=0 
Mar 25 21:22:49 -AB350-Gaming-3 kernel: [ 5183.346821] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=01:00:5e:00:00:01:44:e9:dd:4d:5f:2c:08:00 SRC=192.168.2.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=0 DF
 PROTO=2 
Mar 25 21:23:02 -AB350-Gaming-3 kernel: [ 5196.046355] [UFW BLOCK] IN=wlx74dada970518 OUT= MAC=74:da:da:97:05:18:44:e9:dd:4d:5f:32:08:00 SRC=198.252.206.25 DST=192.168.2.196 LEN=113 TOS=0x08 PREC=0x00 TTL=5
2 ID=1104 DF PROTO=TCP SPT=443 DPT=37790 WINDOW=62 RES=0x00 ACK PSH URGP=0

Any advice on this issue would be appreciated.
Last edited by mojoman; 03-26-2019 at 07:41 AM..
 

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