For documentation purposes,
(after working on items related to bug 1802021 / 1872021 / this bug)
The stack traces in this issue would suggest a duplicate of bug 1802021,
fixed in kernel 4.15.0-47.50, but this happens in 4.15.0-96, which has
that fix.
So, looking at comments #5 and #6, the issue seems particular to the
MAAS deploy boot/environment, as it doesn't happen on the deployed
system with the same kernel (i.e., same system and kernel, different
boot/environment), even when running similar commands.
As such, this issue doesn't seem to be that kernel bug, but a
manifestation with similar symptoms at the kernel level, due to what
seems to be an underlying system/platform issue.
Supporting 'evidence' seems to be the lack of additional comments on
those bugs after Fix Released, and later on this bug, perhaps due to
some system/firmware upgrade, for example.
** Changed in: linux (Ubuntu Bionic)
Status: Triaged => Incomplete
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https://bugs.launchpad.net/bugs/1872021
Title:
[Ubuntu][Bionic] systemd caused kernel to hang on fsnotify wait-on-
completion
Status in MAAS:
Invalid
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Bionic:
Incomplete
Status in linux source package in Eoan:
Won't Fix
Status in linux source package in Focal:
Incomplete
Bug description:
This is with MAAS 2.7.0, commissioning an HP DL385 G7 with Bionic.
During the first boot, the machine performs an apt-get upgrade, which
includes an update of ipmitool (1.8.18-5ubuntu0.1) and freeipmi-tools
(1.4.11-1.1ubuntu4.1).
This triggers hung tasks:
[ 66.457048] cloud-init[1534]: Setting up ipmitool (1.8.18-5ubuntu0.1) ...
Starting IPMI event daemon...
[ OK ] Started IPMI event daemon.
[ 67.240857] cloud-init[1534]: Setting up freeipmi-tools
(1.4.11-1.1ubuntu4.1) ...
[ 67.254241] cloud-init[1534]: Processing triggers for systemd
(237-3ubuntu10.39) ...
[ 242.642684] INFO: task systemd:1 blocked for more than 120 seconds.
[ 242.725654] Not tainted 4.15.0-96-generic #97-Ubuntu
[ 242.799835] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 242.906319] INFO: task kworker/u49:0:6 blocked for more than 120 seconds.
[ 242.997214] Not tainted 4.15.0-96-generic #97-Ubuntu
[ 243.072024] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 247.381896] cloud-init[1534]: Failed to reload daemon: Connection timed
out
[ 247.385109] cloud-init[1534]: Processing triggers for man-db
(2.8.3-2ubuntu0.1) ...
[ 249.828279] cloud-init[1534]: Processing triggers for ureadahead
(0.100.0-21) ...
[ 249.874840] cloud-init[1534]: Processing triggers for install-info
(6.5.0.dfsg.1-2) ...
[ 250.160889] cloud-init[1534]: Processing triggers for libc-bin
(2.27-3ubuntu1) ...
[ 363.465849] INFO: task systemd:1 blocked for more than 120 seconds.
[ 363.550072] Not tainted 4.15.0-96-generic #97-Ubuntu
[ 363.623823] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 363.728949] INFO: task kworker/u49:0:6 blocked for more than 120 seconds.
[ 363.820481] Not tainted 4.15.0-96-generic #97-Ubuntu
[ 363.894774] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 484.291609] INFO: task systemd:1 blocked for more than 120 seconds.
[ 484.381026] Not tainted 4.15.0-96-generic #97-Ubuntu
[ 484.458451] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 484.568130] INFO: task kworker/u49:0:6 blocked for more than 120 seconds.
[ 484.661642] Not tainted 4.15.0-96-generic #97-Ubuntu
[ 484.740371] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 484.850615] INFO: task udevadm:2665 blocked for more than 120 seconds.
[ 484.942379] Not tainted 4.15.0-96-generic #97-Ubuntu
[ 485.018318] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 607.165768] INFO: task systemd:1 blocked for more than 120 seconds.
[ 607.250976] Not tainted 4.15.0-96-generic #97-Ubuntu
[ 607.325651] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 607.432497] INFO: task kworker/u49:0:6 blocked for more than 120 seconds.
[ 607.525757] Not tainted 4.15.0-96-generic #97-Ubuntu
[ 607.599770] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 607.707273] INFO: task udevadm:2665 blocked for more than 120 seconds.
[ 607.795467] Not tainted 4.15.0-96-generic #97-Ubuntu
[ 607.869751] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
I can perform more tests on this system if needed.
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