It looks like the system is pancking while running the tests, which explains
the timeout (after the panic, it'll wait for the timeout to kill the test run).
From the core dump, here's what I see:
```
> ::status
debugging crash dump vmcore.0 (64-bit) from openindiana
operating system: 5.11 origin/pr/124-0-g84fbf78cb5 (i86pc)
image uuid: 52c96b5b-dc11-ed9c-8882-c48a662ba5da
panic message: BAD TRAP: type=e (#pf Page fault) rp=ffffff000fb4c460
addr=ffffff03e98a5000
dump content: kernel pages only
> ::stack
annotate_ecksum+0x125(ffffff0404779548, ffffff000fb4c730, ffffff03e98a4e80,
ffffff03e925f600, 400, 0)
zfs_ereport_post_checksum+0x88(ffffff0c95b70000, ffffff03e883d480,
ffffff0c073b10c0, ffffff0c073b10c0, 3558800, 400)
raidz_checksum_error+0xd9(ffffff0c073b10c0, ffffff03f8706cd0, ffffff03e925f600)
vdev_raidz_combrec+0x574(ffffff0c073b10c0, 0, 0)
vdev_raidz_io_done+0x912(ffffff0c073b10c0)
zio_vdev_io_done+0x86(ffffff0c073b10c0)
zio_execute+0xfa(ffffff0c073b10c0)
taskq_thread+0x318(ffffff06473cc1b0)
thread_start+8()
> ffffff03e98a5000::whatis
ffffff03e98a5000 is freed from the heap vmem arena:
ADDR TYPE START END SIZE
THREAD TIMESTAMP
ffffff03e9823c68 FREE ffffff03e98a5000 ffffff03e9ea5000 6291456
```
so, it looks like we're trying to access the address `ffffff03e98a5000` after
it has already been freed.
the core from the previous run that caused the same panic can be downloaded
from the "artifacts" page for that run,
[here](http://jenkins.open-zfs.org/blue/organizations/jenkins/openzfs%2Fopenzfs/detail/PR-124/15/artifacts);
or directly using [this
link](http://jenkins.open-zfs.org/job/openzfs/job/openzfs/job/PR-124/15/artifact/run-zfs-tests-crash.tar.xz).
It'll take an illumos based system with `mdb` to inspect it though.
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