GPF & Reboot during pool unlock after upgrade 11.3-RELEASE -> 11.3-U2.1

[thulle]

Setup:

• Supermicro X8DTH-i/6/iF/6F
• 2x Xeon x5650
• 56GB allocated to FreeNAS
• Ubuntu 19.10 host
• FreeNAS virtualized in KVM/QEMU
• Boot drive is a zvol on the host.
• 6x ST8000AS0002-1NA in RAID-Z2, a bunch of misc drives in striped mirrors.
• 3x SAS2008, 1x on the MB, 1x IBM m1015, 1x Dell H200
• Norco 4224 w backplanes.

Issue:

After upgrading from 11.3-RELEASE to 11.3-U2.1 the system reboots before finishing unlocking either pool.
I got the following trace in the syslog:

Code:

Apr 30 21:21:45 amnesia kernel trap 9 with interrupts disabled
Apr 30 21:21:45 amnesia Fatal trap 9: general protection fault while in kernel mode
Apr 30 21:21:45 amnesia cpuid = 0; apic id = 00
Apr 30 21:21:45 amnesia instruction pointer     = 0x20:0xffffffff80aea150
Apr 30 21:21:45 amnesia stack pointer           = 0x28:0xfffffe100998d830
Apr 30 21:21:45 amnesia frame pointer           = 0x28:0xfffffe100998d890
Apr 30 21:21:45 amnesia code segment            = base 0x0, limit 0xfffff, type 0x1b
Apr 30 21:21:45 amnesia                         = DPL 0, pres 1, long 1, def32 0, gran 1
Apr 30 21:21:45 amnesia processor eflags        = resume, IOPL = 0
Apr 30 21:21:45 amnesia current process         = 11 (idle: cpu0)
Apr 30 21:21:45 amnesia trap number             = 9
Apr 30 21:21:45 amnesia panic: general protection fault
Apr 30 21:21:45 amnesia cpuid = 0
Apr 30 21:21:45 amnesia KDB: stack backtrace:
Apr 30 21:21:45 amnesia db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe100998d540
Apr 30 21:21:45 amnesia vpanic() at vpanic+0x17e/frame 0xfffffe100998d5a0
Apr 30 21:21:45 amnesia panic() at panic+0x43/frame 0xfffffe100998d600
Apr 30 21:21:45 amnesia trap_fatal() at trap_fatal+0x369/frame 0xfffffe100998d650
Apr 30 21:21:45 amnesia trap() at trap+0x5d/frame 0xfffffe100998d760
Apr 30 21:21:45 amnesia calltrap() at calltrap+0x8/frame 0xfffffe100998d760
Apr 30 21:21:45 amnesia --- trap 0x9, rip = 0xffffffff80aea150, rsp = 0xfffffe100998d830, rbp = 0xfffffe100998d890 ---
Apr 30 21:21:45 amnesia callout_process() at callout_process+0x140/frame 0xfffffe100998d890
Apr 30 21:21:45 amnesia handleevents() at handleevents+0x1a8/frame 0xfffffe100998d8e0
Apr 30 21:21:45 amnesia timercb() at timercb+0xad/frame 0xfffffe100998d930
Apr 30 21:21:45 amnesia lapic_handle_timer() at lapic_handle_timer+0xa2/frame 0xfffffe100998d970
Apr 30 21:21:45 amnesia Xtimerint() at Xtimerint+0xa5/frame 0xfffffe100998d970
Apr 30 21:21:45 amnesia --- interrupt, rip = 0xffffffff81198fc6, rsp = 0xfffffe100998da40, rbp = 0xfffffe100998da40 ---
Apr 30 21:21:45 amnesia acpi_cpu_c1() at acpi_cpu_c1+0x6/frame 0xfffffe100998da40
Apr 30 21:21:45 amnesia acpi_cpu_idle() at acpi_cpu_idle+0x2de/frame 0xfffffe100998da90
Apr 30 21:21:45 amnesia cpu_idle_acpi() at cpu_idle_acpi+0x3f/frame 0xfffffe100998dab0
Apr 30 21:21:45 amnesia cpu_idle() at cpu_idle+0x94/frame 0xfffffe100998dad0
Apr 30 21:21:45 amnesia sched_idletd() at sched_idletd+0x476/frame 0xfffffe100998dbb0
Apr 30 21:21:45 amnesia fork_exit() at fork_exit+0x83/frame 0xfffffe100998dbf0
Apr 30 21:21:45 amnesia fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe100998dbf0
Apr 30 21:21:45 amnesia --- trap 0, rip = 0, rsp = 0, rbp = 0 ---
Apr 30 21:21:45 amnesia KDB: enter: panic

Doing a rollback to 11.3-RELEASE makes everything stable again.