login: uvm_fault(0xffffff003f12ca50, 0x6000100, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at switchwrite+0x98: movq 0(%r13),%rbx
ddb>
ddb> set $lines = 0
ddb> show panic
kernel page fault
uvm_fault(0xffffff003f12ca50, 0x6000100, 0, 1) -> e
switchwrite(ffffff0037c07360,ffffff0037c07360,ffff800014ad6268) at switchwrite+0x98 sys/net/switchctl.c:234
end trace frame: 0xffff800014ad6140, count: 0
ddb> trace
switchwrite(ffffff0037c07360,ffffff0037c07360,ffff800014ad6268) at switchwrite+0x98 sys/net/switchctl.c:234
spec_write(ffffffff81e38cc0) at spec_write+0xa0 sys/kern/spec_vnops.c:310
VOP_WRITE(82,ffffff0037c07360,1,ffff800014ad6268) at VOP_WRITE+0x65 sys/kern/vfs_vops.c:268
vn_write(ffffff0037690960,ffff800014ad6268,82) at vn_write+0x127 sys/kern/vfs_vnops.c:397
dofilewritev(ffff8000ffffc710,ffff800014ad6310,82,ffff800014ad6328,806c53c9e38) at dofilewritev+0x13e sys/kern/sys_generic.c:364
sys_write(ffff800014ad63b0,ffff8000ffffc710,ffff800014a15660) at sys_write+0x6e sys/kern/sys_generic.c:283syscall(0) at syscall+0x3e4
Xsyscall(6,0,c,0,3,80490192010) at Xsyscall+0x128
end of kernel
end trace frame: 0x806c53c9ec0, count: -8
ddb> show registers
rdi 0xffffffff81e043a8 switch_ifs_lk
rsi 0xffff800014ad6268
rbp 0xffff800014ad60c0
rbx 0x6000100 __kernel_end_phys+0x4000100
rdx 0x1
rcx 0x2158 __ALIGN_SIZE+0x1158
rax 0x8
r8 0xffff800014ad6310
r9 0
r10 0
r11 0xffffffff815244d0 switchwrite
r12 0x82
r13 0x6000100 __kernel_end_phys+0x4000100
r14 0xffff800000adc900
r15 0xffff800014ad6268
rip 0xffffffff81524568 switchwrite+0x98
cs 0x8
rflags 0x10202 __ALIGN_SIZE+0xf202
rsp 0xffff800014ad6060
ss 0x10
switchwrite+0x98: movq 0(%r13),%rbx
ddb>