z_upgrade

> ::status
debugging crash dump vmcore.0 (64-bit) from pers
operating system: 5.11 omnios-r151036-4a32ffb911 (i86pc)
build version: gfx-drm - heads/master-0-gbdc58b1-dirty
illumos-kvm - heads/r151036-0-g1fba1a9
heads/r151036-0-g4a32ffb911

image uuid: 19459626-713d-c102-f2b6-bd6b4f14d7eb
panic message: BAD TRAP: type=e (#pf Page fault) rp=fffffe00f910fa30 addr=0 occurred in module "<unknown>" due to a NULL pointer dereference
dump content: kernel pages only
>
> $C
fffffe00f910fc00 taskq_thread+0x2cd(fffffeb2002d51d0)
fffffe00f910fc10 thread_start+0xb()
>
> fffffe00f910fa30::whatis
fffffe00f910fa30 is in thread fffffe00f910fc20's stack
> fffffe00f910fc20::findstack
stack pointer for thread fffffe00f910fc20 (tq:z_upgrade): fffffe00f910e6d0
  fffffe00f910fc20 0x15()
>
> ::spa
ADDR                 STATE NAME
fffffeb1d409e000    ACTIVE pers
fffffeb1b989d000    ACTIVE rpool
> fffffeb1d409e000::print spa_t spa_upgrade_taskq | ::taskq -t
ADDR             NAME                             ACT/THDS Q'ED  MAXQ INST
fffffeb2002d51d0 z_upgrade                          1/   1  216     -    -
    THREAD           STATE    SOBJ                COUNT
    fffffe00f910fc20 PANIC    <NONE>                  1
                     0x15