Fatal trap 9: general protection fault while in kernel mode
cpuid = 6; apic id = 06
instruction pointer     = 0x20:0xffffffff80f9f6ff
stack pointer           = 0x28:0xfffffe00dc0bf960
frame pointer           = 0x28:0xfffffe00dc0bf9d0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 0 (vmbusdev)
trap number             = 9
panic: general protection fault
cpuid = 6
time = 1642602217
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00dc0bf780
vpanic() at vpanic+0x17f/frame 0xfffffe00dc0bf7d0
panic() at panic+0x43/frame 0xfffffe00dc0bf830
trap_fatal() at trap_fatal+0x385/frame 0xfffffe00dc0bf890
calltrap() at calltrap+0x8/frame 0xfffffe00dc0bf890
--- trap 0x9, rip = 0xffffffff80f9f6ff, rsp = 0xfffffe00dc0bf960, rbp = 0xfffffe00dc0bf9d0 ---
vm_phys_alloc_contig() at vm_phys_alloc_contig+0x1df/frame 0xfffffe00dc0bf9d0
vm_page_find_contig_domain() at vm_page_find_contig_domain+0xa1/frame 0xfffffe00dc0bfa40
vm_page_alloc_contig_domain() at vm_page_alloc_contig_domain+0xc7/frame 0xfffffe00dc0bfae0
kmem_alloc_contig_pages() at kmem_alloc_contig_pages+0x61/frame 0xfffffe00dc0bfb60
kmem_alloc_contig_domainset() at kmem_alloc_contig_domainset+0x17e/frame 0xfffffe00dc0bfc20
bounce_bus_dmamem_alloc() at bounce_bus_dmamem_alloc+0x182/frame 0xfffffe00dc0bfc60
hyperv_dmamem_alloc() at hyperv_dmamem_alloc+0x6f/frame 0xfffffe00dc0bfca0
hn_attach() at hn_attach+0xeaa/frame 0xfffffe00dc0bfd90
device_attach() at device_attach+0x3cc/frame 0xfffffe00dc0bfde0
device_probe_and_attach() at device_probe_and_attach+0x41/frame 0xfffffe00dc0bfe10
vmbus_add_child() at vmbus_add_child+0x55/frame 0xfffffe00dc0bfe40
taskqueue_run_locked() at taskqueue_run_locked+0x187/frame 0xfffffe00dc0bfec0
taskqueue_thread_loop() at taskqueue_thread_loop+0xc2/frame 0xfffffe00dc0bfef0
fork_exit() at fork_exit+0x82/frame 0xfffffe00dc0bff30
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00dc0bff30
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 0 tid 100121 ]
Stopped at      kdb_enter+0x37: movq    $0,0x1059dbe(%rip)
db>