In my LXD server, I have faced zfs issue. where is the problem? But after reboot it works fine.
I suspect dmesg may have sown shown some driver or kernel issues prior to the reboot.
[ 29.600061] systemd[1]: Mounting POSIX Message Queue File System…
[ 29.607351] systemd[1]: Mounting RPC Pipe File System…
[ 29.614905] systemd[1]: Mounting Kernel Debug File System…
[ 29.622454] systemd[1]: Mounting Kernel Trace File System…
[ 29.631663] systemd[1]: Starting Journal Service…
[ 29.641122] systemd[1]: Starting Set the console keyboard layout…
[ 29.649311] systemd[1]: Starting Create list of static device nodes for the current kernel…
[ 29.657841] systemd[1]: Starting Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling…
[ 29.662880] systemd[1]: Condition check resulted in Load Kernel Module drm being skipped.
[ 29.665412] systemd[1]: Condition check resulted in OpenVSwitch configuration for cleanup being skipped.
[ 29.675776] systemd[1]: Condition check resulted in Set Up Additional Binary Formats being skipped.
[ 29.685679] systemd[1]: Starting Load Kernel Modules…
[ 29.695103] systemd[1]: Starting Remount Root and Kernel File Systems…
[ 29.704817] systemd[1]: Starting udev Coldplug all Devices…
[ 29.714729] systemd[1]: Starting Uncomplicated firewall…
[ 29.719960] kernel: EXT4-fs (sda4): re-mounted. Opts: (null)
[ 29.730552] systemd[1]: Mounted Huge Pages File System.
[ 29.731008] kernel: RPC: Registered named UNIX socket transport module.
[ 29.735422] kernel: RPC: Registered udp transport module.
[ 29.735423] kernel: RPC: Registered tcp transport module.
[ 29.735423] kernel: RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 29.750549] systemd[1]: Mounted POSIX Message Queue File System.
[ 29.755971] systemd[1]: Mounted RPC Pipe File System.
[ 29.761096] systemd[1]: Mounted Kernel Debug File System.
[ 29.766160] systemd[1]: Mounted Kernel Trace File System.
[ 29.773116] systemd[1]: Finished Create list of static device nodes for the current kernel.
[ 29.780121] systemd[1]: Finished Load Kernel Modules.
[ 29.787242] systemd[1]: Finished Remount Root and Kernel File Systems.
[ 29.794702] systemd[1]: Finished Set the console keyboard layout.
[ 29.802739] systemd[1]: Finished Uncomplicated firewall.
[ 29.812678] systemd[1]: Activating swap /swap.img…
[ 29.822680] systemd[1]: Mounting FUSE Control File System…
[ 29.832768] systemd[1]: Mounting Kernel Configuration File System…
[ 29.839479] systemd[1]: Condition check resulted in Rebuild Hardware Database being skipped.
[ 29.842170] systemd[1]: Condition check resulted in Platform Persistent Storage Archival being skipped.
[ 29.848594] systemd[1]: Starting Apply Kernel Variables…
[ 29.858299] systemd[1]: Starting Create System Users…
[ 29.870119] systemd[1]: Mounted FUSE Control File System.
[ 29.876181] systemd[1]: Mounted Kernel Configuration File System.
[ 29.926922] systemd[1]: Finished Create System Users.
[ 29.937607] systemd[1]: Finished Apply Kernel Variables.
[ 29.939581] systemd[1]: Starting Create Static Device Nodes in /dev…
[ 29.975539] systemd[1]: Started Journal Service.
[ 30.100300] kernel: Adding 8388604k swap on /swap.img. Priority:-2 extents:8 across:9076732k FS
[ 30.537720] kernel: IPMI message handler: version 39.2
[ 30.557544] kernel: ipmi device interface
[ 30.571465] kernel: ipmi_si: IPMI System Interface driver
[ 30.571552] kernel: ipmi_si dmi-ipmi-si.0: ipmi_platform: probing via SMBIOS
[ 30.571555] kernel: ipmi_platform: ipmi_si: SMBIOS: io 0xca2 regsize 1 spacing 1 irq 0
[ 30.571556] kernel: ipmi_si: Adding SMBIOS-specified kcs state machine
[ 30.572144] kernel: ipmi_si IPI0001:00: ipmi_platform: probing via ACPI
[ 30.572347] kernel: ipmi_si IPI0001:00: ipmi_platform: [io 0x0ca2] regsize 1 spacing 1 irq 0
[ 30.572349] kernel: ipmi_si dmi-ipmi-si.0: Removing SMBIOS-specified kcs state machine in favor of ACPI
[ 30.572350] kernel: ipmi_si: Adding ACPI-specified kcs state machine
[ 30.572808] kernel: ipmi_si: Trying ACPI-specified kcs state machine at i/o address 0xca2, slave address 0x20, irq 0
[ 30.612790] kernel: power_meter ACPI000D:00: Found ACPI power meter.
[ 30.613122] kernel: power_meter ACPI000D:00: Ignoring unsafe software power cap!
[ 30.613130] kernel: power_meter ACPI000D:00: hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().
[ 30.729850] kernel: ioatdma: Intel® QuickData Technology Driver 5.00
[ 30.751871] kernel: mei_me 0000:00:16.0: Device doesn’t have valid ME Interface
[ 30.802766] kernel: RAPL PMU: API unit is 2^-32 Joules, 2 fixed counters, 655360 ms ovfl timer
[ 30.802768] kernel: RAPL PMU: hw unit of domain package 2^-14 Joules
[ 30.802768] kernel: RAPL PMU: hw unit of domain dram 2^-16 Joules
[ 30.920287] kernel: ipmi_si IPI0001:00: The BMC does not support clearing the recv irq bit, compensating, but the BMC needs to be fixed.
[ 31.007988] kernel: ipmi_si IPI0001:00: IPMI message handler: Found new BMC (man_id: 0x002a7c, prod_id: 0x0844, dev_id: 0x20)
[ 31.047010] kernel: ipmi_si IPI0001:00: IPMI kcs interface initialized
[ 31.048819] kernel: ipmi_ssif: IPMI SSIF Interface driver
[ 31.070272] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fa0
[ 31.070287] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fa0
[ 31.070305] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fa0
[ 31.070322] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2f60
[ 31.070335] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fa8
[ 31.070339] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fa8
[ 31.070344] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fa8
[ 31.070352] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2f71
[ 31.070360] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2f71
[ 31.070367] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2f71
[ 31.070374] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2faa
[ 31.070379] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2faa
[ 31.070386] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2faa
[ 31.070393] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fab
[ 31.070398] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fab
[ 31.070406] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fab
[ 31.070413] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fac
[ 31.070418] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fac
[ 31.070425] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fac
[ 31.070433] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fad
[ 31.070439] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fad
[ 31.070446] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fad
[ 31.070454] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2f68
[ 31.070460] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2f79
[ 31.070475] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2f6a
[ 31.070492] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2f6b
[ 31.070509] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2f6c
[ 31.070524] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2f6d
[ 31.070540] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2ffc
[ 31.070544] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2ffc
[ 31.070552] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2ffc
[ 31.070562] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2ffd
[ 31.070566] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2ffd
[ 31.070574] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2ffd
[ 31.070583] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fbd
[ 31.070590] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fbd
[ 31.070598] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fbd
[ 31.070605] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fbf
[ 31.070611] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fbf
[ 31.070619] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fbf
[ 31.070627] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fb9
[ 31.070633] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fb9
[ 31.070641] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fb9
[ 31.070648] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fbb
[ 31.070654] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fbb
[ 31.070662] kernel: EDAC sbridge: Seeking for: PCI ID 8086:2fbb
[ 31.070776] kernel: EDAC MC0: Giving out device to module sb_edac controller Haswell SrcID#1_Ha#0: DEV 0000:ff:12.0 (INTERRUPT)
[ 31.070879] kernel: EDAC MC1: Giving out device to module sb_edac controller Haswell SrcID#0_Ha#0: DEV 0000:7f:12.0 (INTERRUPT)
[ 31.070880] kernel: EDAC sbridge: Ver: 1.1.2
[ 31.097161] kernel: intel_rapl_common: Found RAPL domain package
[ 31.097165] kernel: intel_rapl_common: Found RAPL domain dram
[ 31.097166] kernel: intel_rapl_common: DRAM domain energy unit 15300pj
[ 31.097286] kernel: intel_rapl_common: Found RAPL domain package
[ 31.097291] kernel: intel_rapl_common: Found RAPL domain dram
[ 31.097293] kernel: intel_rapl_common: DRAM domain energy unit 15300pj
[ 31.462866] kernel: zlua: loading out-of-tree module taints kernel.
[ 31.462871] kernel: zlua: module license ‘MIT’ taints kernel.
[ 31.462872] kernel: Disabling lock debugging due to kernel taint
[ 32.108289] kernel: Adding 20971516k swap on /dev/sda3. Priority:-3 extents:1 across:20971516k FS
[ 33.565273] kernel: ZFS: Loaded module v0.8.3-1ubuntu12.6, ZFS pool version 5000, ZFS filesystem version 5
[ 33.592792] kernel: alua: device handler registered
[ 33.595526] kernel: emc: device handler registered
[ 33.601455] kernel: rdac: device handler registered
[ 33.792263] kernel: EXT4-fs (sda2): recovery complete
[ 33.792413] kernel: EXT4-fs (sda2): mounted filesystem with ordered data mode. Opts: (null)
[ 34.940198] kernel: audit: type=1400 audit(1614777184.244:2): apparmor=“STATUS” operation=“profile_load” profile=“unconfined” name=“nvidia_modprobe” pid=1835 comm=“apparmor_parser”
[ 34.940200] kernel: audit: type=1400 audit(1614777184.244:3): apparmor=“STATUS” operation=“profile_load” profile=“unconfined” name=“nvidia_modprobe//kmod” pid=1835 comm=“apparmor_parser”
[ 34.947368] kernel: audit: type=1400 audit(1614777184.252:4): apparmor=“STATUS” operation=“profile_load” profile=“unconfined” name=“lsb_release” pid=1839 comm=“apparmor_parser”
[ 34.952639] kernel: audit: type=1400 audit(1614777184.260:5): apparmor=“STATUS” operation=“profile_load” profile=“unconfined” name="/usr/bin/man" pid=1834 comm=“apparmor_parser”
[ 34.952642] kernel: audit: type=1400 audit(1614777184.260:6): apparmor=“STATUS” operation=“profile_load” profile=“unconfined” name=“man_filter” pid=1834 comm=“apparmor_parser”
[ 34.952644] kernel: audit: type=1400 audit(1614777184.260:7): apparmor=“STATUS” operation=“profile_load” profile=“unconfined” name=“man_groff” pid=1834 comm=“apparmor_parser”
[ 34.955531] kernel: audit: type=1400 audit(1614777184.260:8): apparmor=“STATUS” operation=“profile_load” profile=“unconfined” name="/usr/sbin/tcpdump" pid=1836 comm=“apparmor_parser”
[ 34.956663] kernel: audit: type=1400 audit(1614777184.264:9): apparmor=“STATUS” operation=“profile_load” profile=“unconfined” name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=1840 comm=“apparmor_parser”
[ 34.956666] kernel: audit: type=1400 audit(1614777184.264:10): apparmor=“STATUS” operation=“profile_load” profile=“unconfined” name="/usr/lib/NetworkManager/nm-dhcp-helper" pid=1840 comm=“apparmor_parser”
[ 34.956667] kernel: audit: type=1400 audit(1614777184.264:11): apparmor=“STATUS” operation=“profile_load” profile=“unconfined” name="/usr/lib/connman/scripts/dhclient-script" pid=1840 comm=“apparmor_parser”
[ 37.541803] kernel: pps pps0: new PPS source ptp0
[ 37.542081] kernel: ixgbe 0000:02:00.1: registered PHC device on enp2s0f1
[ 42.732221] kernel: ixgbe 0000:02:00.1 enp2s0f1: NIC Link is Up 10 Gbps, Flow Control: RX/TX
[ 42.732430] kernel: IPv6: ADDRCONF(NETDEV_CHANGE): enp2s0f1: link becomes ready
[ 42.981470] kernel: ixgbe 0000:02:00.1 enp2s0f1: NIC Link is Down
[ 43.868648] kernel: ixgbe 0000:02:00.1 enp2s0f1: NIC Link is Up 10 Gbps, Flow Control: RX/TX
[ 45.297372] kernel: FS-Cache: Loaded
[ 45.564709] kernel: FS-Cache: Netfs ‘nfs’ registered for caching
[ 45.716315] kernel: NFS: Registering the id_resolver key type
[ 45.716324] kernel: Key type id_resolver registered
[ 45.716325] kernel: Key type id_legacy registered
[ 48.854317] kernel: new mount options do not match the existing superblock, will be ignored
Sadly this won’t show you anything prior to the reboot of the machine.