[Bug 237937] Removing path with mpr and geom_multipath causes kernel panic

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237937

            Bug ID: 237937
           Summary: Removing path with mpr and geom_multipath causes
                    kernel panic
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: pascal.guitierrez at gmail.com

This issue occurs on both 12.0-RELEASE-p5 and 13-CURRENT r347415 (snap from
10th of May 2019).


Reproducing is very easy:
1. Setup a bunch of multipath SAS disks using gmultipath (I am using 100 SAS
disks with two 9300-8e SAS HBA's, but issue occurs even on 1x HBA)
2. Create a ZFS pool based on these (zpool create bench mirror multipath/..
...)
3. Run some I/O on the pool: iozone -a
4. Physically pull one of the paths, wait, plug back in. Confirm that the path
is OPTIMAL via gmultipath. Then repeat with the other port.

Eventually I/O will be frozen to the OS (there's a bunch of scsi ioc terminated
and CAM status: CCB request completed with an error) and eventually the system
will panic.


This is 100% reproducible on my setup, can also provide SSH/IPMI access if
needed.

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