Public bug reported:
On Ubuntu 16.04 LTS I updated the hwe kernel from 4.10.0-42-generic
x86_64 to 4.13.0-26 to get the Meltdown patch. On this box, I use
systemd-nspawn to run containers using ephemeral mode on a btrfs volume
(set up as a loopback device by systemd). After the kernel update,
btrfs appears to be getting stuck somewhere with fairly high frequency
(so far it's occurred always within an hour or two of use, on two
separate machines). Anything that touches the btrfs volume will then
freeze, including a btrfs scrub. The machine has to be hard rebooted
and will continue to display the problem until the kernel is reverted,
at which point btrfs proceeds as normal.
Attached are the sysreq 't' trace output and the hung task output from
journalctl.
** Affects: btrfs (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "journalctl output with hung task info"
https://bugs.launchpad.net/bugs/1742862/+attachment/5035582/+files/jounal.log
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https://bugs.launchpad.net/bugs/1742862
Title:
btrfs wedge after 4.13.0-26 hwe kernel update
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