[Bug 231211] [zfs] possible deadlock triggered by zfs test suite

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231211

            Bug ID: 231211
           Summary: [zfs] possible deadlock triggered by zfs test suite
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: lwhsu at FreeBSD.org

When running zfs test suite in bhyve, it usually panics with following message:

panic: deadlres_td_sleep_q: possible deadlock detected for 0xfffff8006b642000,
blocked for 180024 ticks

VM image and core files (vmcore.1 is used in this bug report, vmcore.0 is
previous run, also panicked in the same point):

https://people.freebsd.org/~lwhsu/zfs-deadlock/

Some ddb outputs:

https://gist.github.com/lwhsu/88bce6ffaa2ccc5e8da4fe186dbeb54f

Also note that there might be another issue:

chain 96:                                                                     
 thread 100230 (pid 0, zio_null_intr) blocked on lockmgr (null)EXCL             
thread -559038242 (pid 268435455,
pppppppppppppppppppppppppppppppppppppppppppppsecondarycache) ??? (0xdeadc0de)

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