[Bug 231296] smartpqi - and/or ZFS - related kernel panics

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231296

--- Comment #23 from Josh Gitlin <jgitlin+freebsd at goboomtown.com> ---
We experienced the kmem_back issues as well, and we're running a Skylake:
Intel® Xeon® Bronze 3106 Processor

We haven't seen the issue since reducing ARC size, but the same config had been
stable for years prior to that. (We did change hardware however)

Backtrace was: 

trap number = 12
panic: page fault
cpuid = 6
KDB: stack backtrace:
#0 0xffffffff80b3d567 at kdb_backtrace+0x67
#1 0xffffffff80af6b07 at vpanic+0x177
#2 0xffffffff80af6983 at panic+0x43
#3 0xffffffff80f77fcf at trap_fatal+0x35f
#4 0xffffffff80f78029 at trap_pfault+0x49
#5 0xffffffff80f777f7 at trap+0x2c7
#6 0xffffffff80f57dac at calltrap+0x8
#7 0xffffffff80dee7e2 at kmem_back+0xf2
#8 0xffffffff80dee6c0 at kmem_malloc+0x60
#9 0xffffffff80de6172 at keg_alloc_slab+0xe2
#10 0xffffffff80de8b7e at keg_fetch_slab+0x14e
#11 0xffffffff80de8364 at zone_fetch_slab+0x64
#12 0xffffffff80de848f at zone_import+0x3f
#13 0xffffffff80de4b99 at uma_zalloc_arg+0x3d9
#14 0xffffffff826e6ab2 at zio_write_compress+0x1e2
#15 0xffffffff826e574c at zio_execute+0xac
#16 0xffffffff80bled74 at taskqueue_run_locked+0x154
#17 0xffffffff80b4fed8 at taskqueue_thread_loop+0x98
Uptime: 18d18h31m6s
mpr0: Sending StopUnit: path (xpt0:mpr0:0:10:ffffffff): handle 10 
mpr0: Incrementing SSU count
mpr0: Sending StopUnit: path (xpt0:mpr0:0:13:ffffffff): handle 13 
mpr0: Incrementing SSU count
mpr0: Sending StopUnit: path Ixpt0:mpr0:0:16:ffffffff): handle 16 
mpr0: Incrementing SSU count

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