panic: bootpc: subnet mask len is 3
cpuid = 2
Trace beginning at frame 0xfffff801182c36d8
bootpc_init() at bootpc_init+0xce4 0xffffffff80a82d44 
bootpc_init() at bootpc_init+0xce4 0xffffffff80a82d44 
sysctl_df_test() at sysctl_df_test+0xcf 0xffffffff80a8316f 
sysctl_root.isra.5() at sysctl_root.isra.5+0x166 0xffffffff80683dd6 
userland_sysctl() at userland_sysctl+0x111 0xffffffff80684171 
sys___sysctl() at sys___sysctl+0x74 0xffffffff806842d4 
Debugger("panic")

CPU2 stopping CPUs: 0x0000003b
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdda09(%rip)
db>