[Bug 258049] vm_reserv_depopulate panic.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258049

            Bug ID: 258049
           Summary: vm_reserv_depopulate panic.
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: dgilbert@eicat.ca

I experienced this crash on riscv (while doing a makeworld -j8), but I'm told
it has been observed on amd64, too.  This is the panic:

panic: vm_reserv_depopulate: reserv 0xffffffd3e672c560's popmap[208] is clear
cpuid = 1
time = 1629858147
KDB: stack backtrace:
db_trace_self() at db_trace_self
db_trace_self_wrapper() at db_trace_self_wrapper+0x38
kdb_backtrace() at kdb_backtrace+0x2c
vpanic() at vpanic+0x148
panic() at panic+0x2a
vm_reserv_free_page() at vm_reserv_free_page+0x37c
vm_page_free_prep() at vm_page_free_prep+0x168
vm_page_free_toq() at vm_page_free_toq+0x18
vm_page_free() at vm_page_free+0x18
vm_object_terminate() at vm_object_terminate+0xec
vm_object_deallocate() at vm_object_deallocate+0x2a6
vm_map_process_deferred() at vm_map_process_deferred+0x9c
vm_map_remove() at vm_map_remove+0xd2
vmspace_exit() at vmspace_exit+0x10e
exit1() at exit1+0x4aa
sys_sys_exit() at sys_sys_exit+0x10
do_trap_user() at do_trap_user+0x208
cpu_exception_handler_user() at cpu_exception_handler_user+0x72

The dump files can be fetched at
https://nextcloud.towernet.ca/s/HiJ654HLWnbT6jD

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