Public bug reported:
Platform details:
1) version.log attached
2) lspci-vnvn.log attached
3) lsb_release -rd
Description: Ubuntu 18.04.5 LTS
Release: 18.04
4) apt-cache policy bcache-tools
bcache-tools:
Installed: 1.0.8-2ubuntu0.18.04.1
Candidate: 1.0.8-2ubuntu0.18.04.1
Version table:
*** 1.0.8-2ubuntu0.18.04.1 500
500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.0.8-2build1 500
500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
5) uname -a:
Linux timber4 4.15.0-117-generic #118-Ubuntu SMP Fri Sep 4 20:02:41 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
Short problem description:
Rsyncing from a 1.4TB home dir to a an new filesystem on a bcache device
without an attached cache eventually results in kernel panic.
What I expected to happen: no kernel panic.
Long problem description:
1) Devices / Filesystems:
bfd01: 8*4TB configured as RAID6 using md LVM2 volume group.
bfd02: 8*4TB configured as RAID6 using Dell PERC H810 LVM2 volume group.
The tree contains 1069685 files / dirs.
2) Steps to reproduce:
# Make the device, format and mount it
make-bcache -B /dev/vg-bfd02/delme01_bc
mkfs.xfs -f -L delme01bc /dev/bcache0
mount /dev/bcache0 /dev/bfd02/delme01bc
# Rsync
flags="-a --delete" ; info_cmd="--info=progress2" ; excludes="";
src=/mnt/bfd01/delme01 ; tgt=/mnt/bfd02/delme01bc/ ;
time rsync $flags $info_cmd $excludes $src/ $tgt/
...
# eventually kernel panic
Using incremental rsync it will kernel panic after reading about 21GB.
# If instead I use non-incremental rsync it will kernel panic after
reading about 1.2-1.3TB.
flags="--no-inc-recursive -ax -HAXS --delete" ; info_cmd="--info=progress2" ;
excludes="";
...
# eventually kernel panic
Additional detail:
1) I was *not* able to reproduce if bfd01/delm01bc was a target and
bfd02 was the source e.g.
# Rsync
flags="-a --delete" ; info_cmd="--info=progress2" ; excludes="";
src=/mnt/bfd02/delme01 ; tgt=/mnt/bfd01/delme01bc/ ;
time rsync $flags $info_cmd $excludes $src/ $tgt/
...
# rsync completes successfully
2) I was *not* able to reproduce if I attached and then detached a cache set:
ceho 'd3b93488-714e-4efa-af94-cd80fd2db11f' > /sys/block/bcache0/bcache/attach
echo 1 > /sys/block/bcache0/bcache/detach
...
time rsync $flags $info_cmd $excludes $src/ $tgt/
...
# rsync completes successfully
I have 11 compressed kernel crash dumps. I will upload 3 after filing this. Let
me know if you want the other 8.
ProblemType: KernelCrash
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-117-generic 4.15.0-117.118
ProcVersionSignature: Ubuntu 4.15.0-117.118-generic 4.15.18
Uname: Linux 4.15.0-117-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Sep 13 12:53 seq
crw-rw---- 1 root audio 116, 33 Sep 13 12:53 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
Date: Sat Sep 12 09:51:37 2020
HibernationDevice: RESUME=none
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
MachineType: Dell Inc. PowerEdge R620
PciMultimedia:
ProcFB: 0 mgadrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-117-generic
root=UUID=de68d15b-3948-4666-9bc5-5cbecc83971c ro maybe-ubiquity
crashkernel=512M-:512M
RelatedPackageVersions:
linux-restricted-modules-4.15.0-117-generic N/A
linux-backports-modules-4.15.0-117-generic N/A
linux-firmware 1.173.19
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/06/2019
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.9.0
dmi.board.name: 0KCKR5
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 23
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr2.9.0:bd12/06/2019:svnDellInc.:pnPowerEdgeR620:pvr:rvnDellInc.:rn0KCKR5:rvrA00:cvnDellInc.:ct23:cvr:
dmi.product.name: PowerEdge R620
dmi.sys.vendor: Dell Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-kernelcrash bionic uec-images
** Attachment added: "cat /proc/version_signature > version.log"
https://bugs.launchpad.net/bugs/1895563/+attachment/5410760/+files/version.log
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https://bugs.launchpad.net/bugs/1895563
Title:
Kernel Oops: Rsyncing to bcache device w/o backing cache kernel panic
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