Just happened for the second time in 46 hours (and it never happened
before):
kernel: [167836.884337] INFO: task kcompactd0:63 blocked for more than 120
seconds.
kernel: [167836.887341] Not tainted 4.15.0-128-generic #131-Ubuntu
kernel: [167836.889880] "echo 0 > /proc/sys/kernel/hung_task_t
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: postgresql-11 (Ubuntu)
Status: New => Confirmed
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** Also affects: postgresql-11 (Ubuntu)
Importance: Undecided
Status: New
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Title:
kcompactd0 and btrfs-transaction keep de
I had the problem with Ubuntu 18.04 for months. It didn't occur after
that I switched to HWE kernels.
No problem since the migration to Ubuntu 20.04.
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Looks like the same issue kcompactd and btrfs-transaction locking up.
Can not immediately reproduce, seemingly takes ~2weeks to appear. More
problematic systems generally also have higher disk i/o, all btrfs.
%Cpu0 : 3.8 us, 1.3 sy, 0.0 ni, 0.0 id, 94.9 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu1 :
I confirm that downgrading to 4.15.0-106 fixed the issue for me.
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Title:
kcompactd0 and btrfs-transaction keep deadlocking with each
Have same issue:
[ 2538.464378] INFO: task kcompactd0:27 blocked for more than 120 seconds.
[ 2538.466729] Not tainted 4.15.0-122-generic #124-Ubuntu
[ 2538.468652] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[ 2538.471451] kcompactd0 D027 2 0
attch dmesg
** Attachment added: "dmesg.202010251058"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1891773/+attachment/5426902/+files/dmesg.202010251058
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4.15.0-118 still have the issue:
Oct 11 02:20:36 localhost kernel: [1043143.644035] INFO: task kcompactd0:39
blocked for more than 120 seconds.
Oct 11 02:20:36 localhost kernel: [1043143.645095] Not tainted
4.15.0-118-generic #119-Ubuntu
Oct 11 02:20:36 localhost kernel: [1043143.645969] "
I have this issues on VMs running on ESXI hosts. Not a KVM issue.
Currently moved to HWE kernel as suggested and looks like the issue didn't
return.
Hopefully the issue will be resolved soon.
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I have same problem on two computers
One old i5-2500 running Ubuntu 18.04 - 4.15.0-115-generic with btrfs mounted on
/home
One new Ryzen 9 3900X (was) running 18.04 - 4.15.117-generic with btrfs on /
and /home
New one I upgraded yesterday to 20.04 and it is now on 5.4.0-47-generic. I hope
issue
Can you please do a kernel bisection?
https://wiki.ubuntu.com/Kernel/KernelBisection
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Title:
kcompactd0 and btrfs-transaction keep
For some time now I thought the issue is related to the storage for few months
now.
I currently have a system with -113 kernel and btrfs running for over 30 days
but other systems with this kernel had issues. In other hand - previous kernels
had issues (since 106 or so)
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The HWE kernel still has some instances of btrfs-transaction hanging for
2+ minutes but it recovers. Remember to regularly reset the sysctl for
reporting hung tasks or it'll just stop reporting new instances.
The first kernel used on the affected systems was -112 so I don't have
experience of the
As another data point, I was running 4.15.0-106-generic on a BTRFS file
server with an uptime since June. After rebooting Sept 4 to
4.15-0-115-generic, I've experienced this sort of deadlock every few
days (on Sept 5, 8, and 10) under both the -115 and -117 kernels. So,
given the above report on
It's a regression from xenial and took a few weeks to appear on bionic.
I tried using lock_page_killable() in __unmap_and_move() but as far as I
can tell kcompactd0 hasn't got stuck in the same way. Instead I now have
every btrfs_start_transaction suddenly blocking for all processes, which
is impo
Added requested info: yes, this started to happen recently and could be
a regression.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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I have the same issue: kcompactd0 regularity (about every 10 days)
blocks (iowait?) and never recovers. After a few more hours, the system
becomes more or less dead.
I never had this issue until, I would say, 2 month ago. I was running
Ubuntu 18.04 fine until then. No heavy load on the server.
#
Is this a regression that only starts to happen recently?
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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Title
I'm also getting kcompactd0 hanging on its own on another host, which
presumably blocks btrfs-transaction later on:
[606364.285752] INFO: task kcompactd0:27 blocked for more than 120 seconds.
[606364.285994] Not tainted 4.15.0-112-generic #113-Ubuntu
[606364.286129] "echo 0 > /proc/sys/kerne
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