https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267630
Bug ID: 267630
Summary: if growfs is hung at system shutdown, disk sync hangs
and system never halts/reboots
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
In bug 276628, I report an issue with growfs that can cause it to
uninterruptibly deadlock. After growfs deadlocks, when the system is
rebooted/shutdown, it hangs during disk sync, and never halts/reboots. I think
this is because growfs is in disk wait, and cannot be killed, and the UFS
ufssuspend state blocks UFS from completing any pending writes.
The reproduction is easy:
mdconfig -s 20m
gpart create -s gpt md0
gpart add -t freebsd-ufs -s 10m -i 1 md0
newfs md0p1
mount /dev/md0p1 /mnt
gpart resize -i 1 md0
growfs -y md0p1 > /mnt/growfs.log
then, via some other session, halt/reboot/shutdown.
Reproduced in 13.1p2 and a -CURRENT snapshot dated Nov 3 07:57 with identifier
'main-n259005-5cc5c9254da'.
See bug 276628 for more about the userland side of this problem.
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