https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210721
Bug ID: 210721
Summary: Rerooting to an imported ZFS pool triggers panic
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 171971
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=171971&action=edit
system console output
Rerooting to a ZFS dataseft triggers a kernel panic unless the ZFS pool
containing the new root filesystem is exported before rerooting.
Steps to reproduce the problem:
* Install FreeBSD 11.0-ALPHA5 with ZFS on root.
* Install FreeBSD 10.0-ALPHA5 again on the same computer in a differen ZFS
pool.
* Boot into the first installation.
* Set the vfs.root.mountfrom kernel env var to zfs:$SECOND_POOL_ROOT
* Reroot with `reboot -r`.
* Watch the kernel panic.
uname -a output:
FreeBSD sol.local 11.0-ALPHA5 FreeBSD 11.0-ALPHA5 #0 r302293: Thu Jun 30
08:21:36 UTC 2016 [email protected]:/usr/obj/usr/src/sys/GENERIC amd64
I attached the kernel panic backtrace.
The exporting the second pool before running `reroot -r` prevents the panic
during rerooting.
My test setup is slightly more complicated because the second pool resides on
GELI encrypted partitions, but it shouldn't influence the outcome.
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