On Fri, 28 Jul 2023 22:14:16 -0000 (UTC), William Unruh wrote:
> On 2023-07-28, Bit Twister <BitTwister@mouse-potato.com> wrote:
>> On Fri, 28 Jul 2023 01:16:54 -0000 (UTC), William Unruh wrote:
>>> I have a disturbing system, which every once in a while freezes. The
>>> sceen on the monitor is some X scene (usually has Chrome running, but
>>> they again that is often the case) but the keyboard,mouse, do nothing.
>>> Trying to log on from the network fails with no response from the
>>> machine. Alt-ctrl-del does nothing. The only way to recover is via the
>>> power switch on the back.
>>> Afterwards, looking at /var/log/syslog, or /var/log/messages shows
>>> nothingsignificant that I can see just before the freeze.
>>>
>>> Updated Mga8. Kernel 5.15.88-desktop-1.mga8.
>>>
>>> The only thing in the journalctl logs from just before is
>>>
>>> -------------------------------
>>> Jul 24 23:22:34 tunnel.physics.ubc.ca dnf[2573748]: teams 8.9 kB/s | 1.5 kB 00:00
>>> Jul 24 23:22:35 tunnel.physics.ubc.ca dnf[2573748]: Metadata cache created.
>>>
>>> Jul 24 23:22:35 tunnel.physics.ubc.ca systemd[1]: dnf-makecache.service: Succeeded.
>>> Jul 24 23:22:35 tunnel.physics.ubc.ca systemd[1]: Finished dnf makecache.
>>> Jul 24 23:22:35 tunnel.physics.ubc.ca systemd[1]: dnf-makecache.service: Consumed 1.527s CPU time.
>>> Jul 24 23:28:00 tunnel.physics.ubc.ca kernel: Shorewall:sshd-fw:DROP:IN=eno1 OUT= MAC=4c:ed:fb:c2:2a:f3:a0:ab:1b:88:6e:58:08:00 SRC=183.106.205.242 DST=192.168.0.3 LEN=40 TOS=0x00 PREC=0x00 TTL=56 ID=64660 PROTO=TCP SPT=31651 DPT=22 WINDOW=16988 RES=0x00 SYN URGP=0
>>> Jul 24 23:35:31 tunnel.physics.ubc.ca kernel: Shorewall:net-fw:DROP:IN=eno1 OUT= MAC=4c:ed:fb:c2:2a:f3:a0:ab:1b:88:6e:58:08:00 SRC=185.225.74.53 DST=192.168.0.3 LEN=40 TOS=0x00 PREC=0x00 TTL=244 ID=54321 PROTO=TCP SPT=33231 DPT=22 WINDOW=65535 RES=0x00 SYN URGP=0
>>> -- Reboot --
>>> ---------------------------------------
>>>
>>>
>>> I recently replaced the power supply thinking it might be the cause.
>>> But although freezes seem to be occuring less frequently, it is still
>>> occasionally freezing. (It seems to be occuring every two or three
>>> months).
>>
>>
>> Off hand it seems like the cpu gets into a tight loop and quits processing
>> interrupts.
>>
>> I would install lm_sensors, configure/run lm_sensors, sensord and enable core dump.
>>
>> I have also modified ~/.bash_profile to check for core dump files and
>> uses xmessage to provide a pop up if any are found.
>>
>
> OK, Here are the last two sensord reports just before the freeze
> I do not see anything out of the ordinary here. The last one (23:28:55)
> occured. The freeze ( as inferred from the last entry into /var/log/syslog
> occured aroung 23:35:31
>
> (
> --------------------------------
> Jul 24 23:35:31 tunnel kernel: [1181287.585321] Shorewall:net-fw:DROP:IN=eno1 OUT= MAC=4c:ed:fb:c2:2a:f3:a0:ab:1b:88:6e:58:08:00 SRC=185.225.74.53 DST=192.168.0.3 LEN=40 TOS=0x00 PREC=0x00 TTL=244 ID=54321 PROTO=TCP SPT=33231 DPT=22 WINDOW=65535 RES=0x00 SYN URGP=0
> Jul 25 09:13:25 tunnel kernel: [ 0.000000] microcode: microcode updated early to revision 0xf0, date = 2021-11-12
> --------------------------------------
>
> ----------------------------------
> Jul 24 23:08:55 tunnel sensord: Chip: nvme-pci-0600
> Jul 24 23:08:55 tunnel sensord: Adapter: PCI adapter
> Jul 24 23:08:55 tunnel sensord: Composite: 24.9 C (min = -40.1 C, max = 83.8 C)
> Jul 24 23:08:55 tunnel sensord: Sensor 2: 24.9 C (min = -40.1 C, max = 83.8 C)
> Jul 24 23:08:55 tunnel sensord: Chip: coretemp-isa-0000
> Jul 24 23:08:55 tunnel sensord: Adapter: ISA adapter
> Jul 24 23:08:55 tunnel sensord: Package id 0: 29.0 C
> Jul 24 23:08:55 tunnel sensord: Core 0: 28.0 C
> Jul 24 23:08:55 tunnel sensord: Core 1: 27.0 C
> Jul 24 23:08:55 tunnel sensord: Core 2: 28.0 C
> Jul 24 23:08:55 tunnel sensord: Core 3: 27.0 C
> Jul 24 23:08:55 tunnel sensord: Chip: acpitz-acpi-0
> Jul 24 23:08:55 tunnel sensord: Adapter: ACPI interface
> Jul 24 23:08:55 tunnel sensord: temp1: 27.8 C
> Jul 24 23:28:55 tunnel sensord: Chip: nvme-pci-0600
> Jul 24 23:28:55 tunnel sensord: Adapter: PCI adapter
> Jul 24 23:28:55 tunnel sensord: Composite: 24.9 C (min = -40.1 C, max = 83.8 C)
> Jul 24 23:28:55 tunnel sensord: Sensor 2: 24.9 C (min = -40.1 C, max = 83.8 C)
> Jul 24 23:28:55 tunnel sensord: Chip: coretemp-isa-0000
> Jul 24 23:28:55 tunnel sensord: Adapter: ISA adapter
> Jul 24 23:28:55 tunnel sensord: Package id 0: 29.0 C
> Jul 24 23:28:55 tunnel sensord: Core 0: 28.0 C
> Jul 24 23:28:55 tunnel sensord: Core 1: 27.0 C
> Jul 24 23:28:55 tunnel sensord: Core 2: 27.0 C
> Jul 24 23:28:55 tunnel sensord: Core 3: 27.0 C
> Jul 24 23:28:55 tunnel sensord: Chip: acpitz-acpi-0
> Jul 24 23:28:55 tunnel sensord: Adapter: ACPI interface
> Jul 24 23:28:55 tunnel sensord: temp1: 27.8 C
> ----------------------------------------------

I suggest that you should set max value allowed for temps.

>
> I cannot find any core files, and I do not think I am suppressing them.

Pretty sure they are not enabled by default.
You have to make configuration file changes.
Quick scan of my install/change scripts finds this custom
drop-in file and settings

# grep core /etc/sysctl.d/xx__sysctl.conf
# Enabling suid dump PID appending and set core location and name
kernel.core_uses_pid = 1
kernel.core_pattern = /var/tmp/%e_%p_%s.core
# net.core.rmem_max = 1048576