[Bug 1910588] Re: rsync backup hang

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https://bugs.launchpad.net/bugs/1910588

Title:
rsync backup hang

Status in linux package in Ubuntu:
Confirmed

Bug description:
I'm using rsync to backup directories. With kernel 5.8.0.34 it hangs
requiring machine reset; no response from mouse or keyboard. No
response to ping from a windows machine. All drive activity stops. The
hang occurs with the backup drive connected via sata and via usb3
(adapter)

The source directories are ext4 (boot drive ssd) and zfs (raidz1 four
x 4TB drives). The destination is a single 3TB drive formatted with
zfs (drive is about 20% full).

The hang occurred about 6 times before I decided to go back to kernel
5.8.0-33 (hangs ocurred with -34). The backup worked fine with kernel
-33 (sata and usb3 connect). The install is 20.10. Please let me know
if you need more information.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: linux-image-5.8.0-34-generic 5.8.0-34.37
ProcVersionSignature: Ubuntu 5.8.0-34.37-generic 5.8.18
Uname: Linux 5.8.0-34-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp nvidia_modeset zcommon znvpair nvidia
ApportVersion: 2.20.11-0ubuntu50.3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: jcw0624 5100 F.... pulseaudio
/dev/snd/pcmC0D0p: jcw0624 5100 F...m pulseaudio
/dev/snd/controlC1: jcw0624 5100 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Jan 7 12:07:11 2021
InstallationDate: Installed on 2020-10-03 (96 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
IwConfig:
lo no wireless extensions.

enp9s0 no wireless extensions.
MachineType: To be filled by O.E.M. To be filled by O.E.M.
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-34-generic root=UUID=89ed8b12-0ade-4a0f-91c3-8f9f4b3a8a81 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-5.8.0-34-generic N/A
linux-backports-modules-5.8.0-34-generic N/A
linux-firmware 1.190.2
RfKill:

SourcePackage: linux
UpgradeStatus: Upgraded to groovy on 2020-11-09 (59 days ago)
dmi.bios.date: 10/16/2012
dmi.bios.release: 4.6
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1604
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: SABERTOOTH 990FX
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1604:bd10/16/2012:br4.6:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnSABERTOOTH990FX:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: To be filled by O.E.M.
dmi.product.sku: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: To be filled by O.E.M.

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