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Last reproduced with linux-image-generic-hwe-18.04-edge 4.18.0.13.62 on
bionic with cpu AMD Ryzen 7 1700 Eight-Core Processor
external usb hdd drive
/dev/disk/by-id/usb-WD_My_Passport_0820_5758353xxxxx:0-part1
luks encrypted partition
zfs pool
zfs pool used only for backups using syncoid
initially after zpool import -a `df -h` works
30 minutes later `df -h` hangs, doesn't print any output at all, probably after
a zfs receive
df process using 100% cpu
kill -KILL <df pid> has no change in df process, it doesn't die, it's still in
R and using 100% cpu
strace -p <df pid> hangs, doesn't print any output, also can't be killed
unplugging the usb doesn't have any effect, df still in R at 100% cpu
reproducible, happens every time.
I can't reproduce with kernel 4.15.0-43-generic.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Invalid
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df locks up with 100% cpu with zfs on usb, df unkillable
https://bugs.launchpad.net/bugs/1811072
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