Hi, my Manjaro KDE sometime freeze randomly, but not often. I suspect it is the KDE fault. Which log should I look at?
Kernel log? X.org log? Journald log? (I have ksystemlog)
This log must be there after I force restart my pc.
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journalctl -b -1
Will allow you to see the entire system log from the previous boot. Hitting > will jump to the end.
journalctl -b -1 | tail -100
Will just display the last 100 lines of the log, which you can post and hopefully give us some idea of what is going on.
I also feel obligated to give @jonathon's standard response (I've seen it a few times):
âRandom freezesâ are almost always hardware-related (one or more of loose connections, poorly seated components, power, temperature).
You should also test your RAM (run memtest), and take the machine apart, clean it, and reseat all components.
There are plenty of threads with more detail on the forum.
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Please click on the link
Thanks for answer, once I get proper log detail aI will add more information. As this freeze is seldom and random.
Follow up question, I open steam(game dustribution platform) on Manjaro KDE and got soft freeze(freeze for a moment (youtube playing on the background)). What log should I look specific for with regards to steam. I want you guys to have info to fix it but I don't want to flood you with logs either. Thanks.
Anyway here is a log for soft freeze. Just gonna dum it here. I not expect some one get anything useful from this. Just gonna out it here.
[kevin@kevin-pc ~]$ journalctl -b -1 | tail -100
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopped target Multi-User System.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopped target Login Prompts.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopping Modem Manager...
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc ModemManager[423]: <info> Caught signal, shutting down...
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopped Daily man-db cache update.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc avahi-daemon[421]: Got SIGTERM, quitting.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopped Generate mirrorlist weekly.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopped Monthly clean packages cache.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopping Periodic Command Scheduler...
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopping Avahi mDNS/DNS-SD Stack...
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc ModemManager[423]: <info> ModemManager is shut down
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc NetworkManager[424]: <info> [1522271377.7502] manager: NetworkManager state is now DISCONNECTED
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc NetworkManager[424]: <warn> [1522271377.7510] error requesting auth for org.freedesktop.NetworkManager.wifi.share.protected: Authorization check failed: Refusing activation, D-Bus is shutting down.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc dbus-daemon[422]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.4' (uid=0 pid=424 comm="/usr/bin/NetworkManager --no-daemon ")
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc NetworkManager[424]: <warn> [1522271377.7513] error requesting auth for org.freedesktop.NetworkManager.wifi.share.open: Authorization check failed: Refusing activation, D-Bus is shutting down.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc dbus-daemon[422]: [system] Activation via systemd failed for unit 'dbus-org.freedesktop.nm-dispatcher.service': Refusing activation, D-Bus is shutting down.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc NetworkManager[424]: <warn> [1522271377.7514] sup-iface[0x561754856590,wlp0s29u1u5u3]: connection disconnected (reason -3)
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc NetworkManager[424]: <info> [1522271377.7516] device (wlp0s29u1u5u3): supplicant interface state: completed -> disconnected
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc crond[419]: (CRON) INFO (Shutting down)
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopped Periodic Command Scheduler.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc NetworkManager[424]: <info> [1522271377.7562] device (wlp0s29u1u5u3): supplicant interface state: disconnected -> disabled
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc NetworkManager[424]: <info> [1522271377.7562] device (wlp0s29u1u5u3): supplicant interface state: disabled -> disconnected
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc NetworkManager[424]: <info> [1522271377.7563] modem-manager: ModemManager no longer available
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc avahi-daemon[421]: avahi-daemon 0.7 exiting.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopped Avahi mDNS/DNS-SD Stack.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopped Modem Manager.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopped Session c1 of user kevin.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Removed slice User Slice of kevin.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopping Permit User Sessions...
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopping Login Service...
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopped Permit User Sessions.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopped target Network.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopping Network Manager...
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopping WPA supplicant...
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc systemd[1]: Stopped target Remote File Systems.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc NetworkManager[424]: <info> [1522271377.9836] caught SIGTERM, shutting down normally.
āļĄāļĩ.āļ. 29 04:09:37 kevin-pc NetworkManager[424]: <info> [1522271377.9854] device (wlp0s29u1u5u3): state change: disconnected -> unmanaged (reason 'unmanaged', sys-iface-state: 'managed')
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc wpa_supplicant[600]: nl80211: deinit ifname=wlp0s29u1u5u3 disabled_11b_rates=0
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped Login Service.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc wpa_supplicant[600]: wlp0s29u1u5u3: CTRL-EVENT-TERMINATING
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc NetworkManager[424]: <info> [1522271378.4174] device (wlp0s29u1u5u3): set-hw-addr: reset MAC address to 6C:19:8F:B4:F6:B2 (unmanage)
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped WPA supplicant.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc NetworkManager[424]: <info> [1522271378.4499] exiting (success)
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped Network Manager.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopping D-Bus System Message Bus...
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped D-Bus System Message Bus.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped target Basic System.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped target Slices.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Removed slice User and Session Slice.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped target Sockets.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Closed Avahi mDNS/DNS-SD Stack Activation Socket.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Closed CUPS Scheduler.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped target Paths.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped CUPS Scheduler.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Closed D-Bus System Message Bus Socket.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped target System Initialization.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopping Load/Save Random Seed...
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped target Local Encrypted Volumes.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped Forward Password Requests to Wall Directory Watch.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped Dispatch Password Requests to Console Directory Watch.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped Apply Kernel Variables.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopping Update UTMP about System Boot/Shutdown...
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopping Load/Save Screen Backlight Brightness of backlight:acpi_video0...
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped Set Up Additional Binary Formats.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped Load Kernel Modules.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped Update UTMP about System Boot/Shutdown.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped Create Volatile Files and Directories.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped target Local File Systems.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Unmounting /run/user/1000...
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Unmounting /home...
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Unmounting Temporary Directory (/tmp)...
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped Load/Save Screen Backlight Brightness of backlight:acpi_video0.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Removed slice system-systemd\x2dbacklight.slice.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped Load/Save Random Seed.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Unmounted /run/user/1000.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Unmounted Temporary Directory (/tmp).
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped target Swap.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Deactivating swap /dev/sda1...
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Deactivated swap /dev/disk/by-path/pci-0000:00:1f.2-ata-2-part1.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Deactivated swap /dev/disk/by-partuuid/7dd40aa2-6827-4240-bbde-531a5ef126f8.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Deactivated swap /dev/disk/by-id/wwn-0x50014ee00361f9f7-part1.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Deactivated swap /dev/disk/by-id/ata-WDC_WD5000AAKX-001CA0_WD-WMAYUT069311-part1.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Deactivated swap /dev/sda1.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Deactivated swap /dev/disk/by-uuid/cde577bb-6c7a-4952-b21c-c8bf62de5a9a.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Unmounted /home.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Reached target Unmount All Filesystems.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped File System Check on /dev/disk/by-uuid/9865d2d7-6455-4a01-ac73-07606c6643ef.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Removed slice system-systemd\x2dfsck.slice.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped target Local File Systems (Pre).
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopping Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling...
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped Create Static Device Nodes in /dev.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Stopped Remount Root and Kernel File Systems.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Reached target Shutdown.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Reached target Final Step.
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Starting Power-Off...
āļĄāļĩ.āļ. 29 04:09:38 kevin-pc systemd[1]: Shutting down.
āļĄāļĩ.āļ. 29 04:09:39 kevin-pc kernel: systemd-shutdow: 39 output lines suppressed due to ratelimiting
āļĄāļĩ.āļ. 29 04:09:39 kevin-pc systemd-shutdown[1]: Syncing filesystems and block devices.
āļĄāļĩ.āļ. 29 04:09:39 kevin-pc systemd-shutdown[1]: Sending SIGTERM to remaining processes...
āļĄāļĩ.āļ. 29 04:09:39 kevin-pc systemd-journald[266]: Journal stopped
[kevin@kevin-pc ~]$ journalctl -b -1
-- Logs begin at Thu 2018-03-22 17:02:08 +07, end at Fri 2018-03-30 01:29:40 +07. --
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: microcode: microcode updated early to revision 0x1f, date = 2018-02-07
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: Linux version 4.14.29-1-MANJARO (builduser@development) (gcc version 7.3.1 201803>
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-4.14-x86_64 root=UUID=bdef5c02-cd00-4748-b>
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard'>
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: e820: BIOS-provided physical RAM map:
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x0000000000000000-0x000000000009d7ff] usable
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x000000000009d800-0x000000000009ffff] reserved
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x0000000000100000-0x000000001fffffff] usable
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x0000000020000000-0x00000000201fffff] reserved
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x0000000020200000-0x0000000040003fff] usable
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x0000000040004000-0x0000000040004fff] reserved
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x0000000040005000-0x00000000cd667fff] usable
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x00000000cd668000-0x00000000cde12fff] reserved
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x00000000cde13000-0x00000000ce092fff] ACPI NVS
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x00000000ce093000-0x00000000ce097fff] ACPI data
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x00000000ce098000-0x00000000ce0dafff] ACPI NVS
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x00000000ce0db000-0x00000000ceb7cfff] usable
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x00000000ceb7d000-0x00000000ceff1fff] reserved
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x00000000ceff2000-0x00000000ceffffff] usable
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x00000000cf800000-0x00000000df9fffff] reserved
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x00000000f8000000-0x00000000fbffffff] reserved
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x00000000fed00000-0x00000000fed03fff] reserved
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: BIOS-e820: [mem 0x0000000100000000-0x000000021f5fffff] usable
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: NX (Execute Disable) protection: active
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: random: fast init done
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: SMBIOS 2.7 present.
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: DMI: To Be Filled By O.E.M. To Be Filled By O.E.M./Z77 Extreme6, BIOS P1.70 06/11>
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: tsc: Fast TSC calibration failed
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: tsc: Using PIT calibration value
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: e820: remove [mem 0x000a0000-0x000fffff] usable
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: e820: last_pfn = 0x21f600 max_arch_pfn = 0x400000000
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: MTRR default type: uncachable
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: MTRR fixed ranges enabled:
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: 00000-9FFFF write-back
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: A0000-BFFFF uncachable
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: C0000-CFFFF write-protect
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: D0000-E7FFF uncachable
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: E8000-FFFFF write-protect
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: MTRR variable ranges enabled:
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: 0 base 000000000 mask E00000000 write-back
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: 1 base 200000000 mask FE0000000 write-back
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: 2 base 0E0000000 mask FE0000000 uncachable
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: 3 base 0D0000000 mask FF0000000 uncachable
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: 4 base 0CF800000 mask FFF800000 uncachable
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: 5 base 21F800000 mask FFF800000 uncachable
āļĄāļĩ.āļ. 28 12:25:05 kevin-pc kernel: 6 base 21F600000 mask FFFE00000 uncachable
Sorry for the late response, I tend disappear "online" during the weekend (and I took friday off).
Yeah the "-b -1" means to report the log from the "previous boot", "-b -2" would be two boots ago. And since in the soft frreeze there was no reboot, it just shows a normal shutdown. 
Usually when I experience pauses in my system, it's usually disk related. First it's if I'm moving a huge amount of data around on the disk I can get the system very unresponsive because other programs are waiting to get "their" data from the disk. I think this might be more be a ZFS issue, so you might not be seeing it.
The second is when the machine is using a large amount of swap space. If memory is swapped out to disk, application can become unresponsive when they need that memory and the OS is busy reading it back into memory.
Top can give you a good idea of how much memory is swapped out to disk. Just look at the 5th line it will tell you how much swap is available and used. If it's using more than 50% of RAM that could definitely be the problem. (If you have no swap, that could also be a problem.)
If the disk is causing the issue, you can install sysstat, then in a terminal run:
iostat -kdx 15
It first reports disk usage since you booted, then every 15 seconds will report the "change" in disk usage. Interesting numbers are "rkB/s" and "wkB/s" which are the kilobytes read/written per second. If these values are large, in the 20 mb per second range (for hard drives, SSDs can go much higher) the computer might be waiting for the disk. The other values I watch are the "r_await" and "w_await" values, these are how long the computer waited for the disk to read/write some data. If these are in the 1000s (second) range, then the disk is having issues. If they are over 100, you are probably having issues.
The only other reason for a soft freeze that I can think of would be a video thing. If the game is starting up the 3d subsystem on the card, allocating resources and whatnot, I could see the card freezing the screen while the game is initializing it for the game. Although I would expect this to happen every time, or at least be repeatable, like if running program A and starting up program B the screen freezes briefly, then it's probably a video interaction between program A and B.
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