Panic in 9.0_STABLE with ZFS module on DOMU PV with recent build

[Brad Spencer <brad%anduin.eldar.org@localhost>]

I have been running a PV with NetBSD 9.0_STABLE and ZFS filesets for
while with pretty good success.  I went to update the system with a
build as of 20200820 and the ZFS module panics with the included panic
as soon as the ZFS module loads (and maybe starts to do something, don't
know about that part).  The ZFS module appears to work from 20200509
with the new kernel.  Anyone else have this??  The Xen version is older,
a DOM0 from October 2018, 8.99.25 and Xen 4.8.



[   3.8500388] fatal page fault in supervisor mode
[   3.8500388] trap type 6 code 0x2 rip 0xffffffff8022abba cs 0xe030 rflags 0x10202 cr2 0xca000000eb ilevel 0x8 rsp 0xffff8c00d2063c30
[   3.8500388] curlwp 0xffff8c0007460040 pid 0.2 lowest kstack 0xffff8c00d20602c0
kernel: page fault trap, code=0
Stopped in pid 0.2 (system) at  netbsd:xbd_handler+0x223:       movl    $0x5,20(
%r13)
xbd_handler() at netbsd:xbd_handler+0x223
xen_intr_biglock_wrapper() at netbsd:xen_intr_biglock_wrapper+0x1d
evtchn_do_event() at netbsd:evtchn_do_event+0xe8
do_hypervisor_callback() at netbsd:do_hypervisor_callback+0x161
Xhypervisor_pvhvm_callback() at netbsd:Xhypervisor_pvhvm_callback+0xa0
idle_loop() at netbsd:idle_loop+0xb6
ds          16
es          b910
fs          0
gs          d3
rdi         6
rsi         ffff8c00d3556000
rbp         ffff8c00d2063ca0
rbx         1d
rdx         9a0
rcx         16
rax         ffff8c000846b910
r8          698
r9          32
r10         0
r11         246
r12         0
r13         ca000000cb
r14         ffffffffffffffff
r15         ffff8c000846b000
rip         ffffffff8022abba    xbd_handler+0x223
cs          e030
rflags      10202
rsp         ffff8c00d2063c30
ss          e02b
netbsd:xbd_handler+0x223:       movl    $0x5,20(%r13)




-- 
Brad Spencer - brad%anduin.eldar.org@localhost - KC8VKS - http://anduin.eldar.org