syzbot

panic: softclock: invalid to_clock: 254
Starting stack trace...
panic(ffffffff82fe5bdd) at panic+0x1d0 sys/kern/subr_prf.c:229
softclock(0) at softclock+0x2b6 sys/kern/kern_timeout.c:756
softintr_dispatch(0) at softintr_dispatch+0xf6 sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x27
Xspllower() at Xspllower+0x1d
printf(ffffffff830d39c8) at printf+0xa3 sys/kern/subr_prf.c:532
uvm_fault_unwire_locked(fffffd806429add0,ce387f89000,ce388188000) at uvm_fault_unwire_locked+0x2f2
uvm_unmap_kill_entry_withlock(fffffd806429add0,fffffd806ce15600,0) at uvm_unmap_kill_entry_withlock+0x86 sys/uvm/uvm_map.c:1862
uvm_map_teardown(fffffd806429add0) at uvm_map_teardown+0x1c7 sys/uvm/uvm_map.c:2498
uvmspace_free(fffffd806429add0) at uvmspace_free+0xcd sys/uvm/uvm_map.c:3422
reaper(ffff800029fd8290) at reaper+0x246 sys/kern/kern_exit.c:477
end trace frame: 0x0, count: 246
End of stack trace.