> db> bt
> panic: foo
> Stack traceback :
> 0x849f7c18: 
> uvm_map_prepare+0x138(0x827d3e00,0x83c2d000,0x40000,0x801af74c,0xfff
> fffff,0xffffffff,0,0x1801727,0x849f7cb8)
> 0x849f7c64: 
> uvm_map+0xad(0x827d3e00,0x849f7d20,0x40000,0x801af74c,0xffffffff,0xf
> fffffff,0,0x1801727)
> 0x849f7cd4: 
> uvm_km_valloc1+0x6c(0x827d3e00,0x40000,0,0xffffffff,0xffffffff,0)
> 0x849f7d24: sys_execve+0xe6(0x81ee2000,0x849f7f8c,0x849f7ef8)
> 0x849f7ea8: start_init+0x257(0x81ee2000)
> db>

seems like my bug.  let me think how to fix.

(the easiest workaround is to bump size of exec_map.
NCARGS+PAGE_SIZE should be enough.)

YAMAMOTO Takashi