I can't reproduce it. I'm using a macOS host, with qemu 10.1.2, Go
1.25.2 using rsc's 9legacy repo at
https://github.com/rsc/plan9
(it is convenient for qemu; u9fs serves the local content so you can
use host OS tools, etc.)
Does it fail on startup or 50% of the time when you send a request?
I use this modified Go http package example:
package main
import (
"log"
"net/http"
)
func main() {
log.Fatal(http.ListenAndServe(":9000",
http.FileServer(http.Dir("/sys/doc"))))
}
On Fri, Jan 2, 2026 at 6:23 AM <[email protected]> wrote:
>
> Hello,
> I don't know go, just have it to compile some programs.
> I cross-compiled this http server from arm for amd64:
> https://mkws.sh/https/https.go
>
> Running it on 9legacy/amd64 (under qemu) will raise this error 50% of
> the time (otherwise it works pretty well):
> gohttp 177: suicide: sys: fp: Precision Exception mxcsr=0x20 pc=0x215443
>
> Plan 9
> mmuinit: vmstart 0xfffffffff0000000 vmunused 0xfffffffff03cc000 vmunmapped
> 0xfffffffff0400000 vmend 0xfffffffffe000000
> sys->pd 0x108003 0x108023
> l 3 0xffffff7fbfdfeff8 107023
> l 2 0xffffff7fbfdffff8 108023
> l 1 0xffffff7fbffffc00 e3
> l 1 0xffffff7fbffffc00 e3
> base 0xfffffffff03d0000 ptr 0xfffffffff03d0000 nunits 14430208
> physalloc color=0 base=0xe000000 size=0x71fe0000
> apic0: hz 998949300 max 9989493 min 99894 div 3
> intrenable: nil handler for 11, tbdf 0xc001800 for ether0
> #l0: virtio10: 1Gbps port 0xfe000000 irq 11: 525400123456
> 2044M memory: 2800K+220M kernel, 1822M user, 0M lost
> pickmethod...read #e/nobootprompt...pickmethod done
> bind #æ...bind #S...partinit...part plan9 63 67103505
> p9part /dev/sdC0/data plan9
> part 9fat 63 204863
> part nvram 204863 204864
> part fossil 204864 10573102
> part arenas 10573102 62414293
> part isect 62414293 65006353
> part bloom 65006353 65530641
> auth...mount usbd...can't open /srv/usbtime...
> venti...2026/0102 11:36:29 venti: conf.../boot/venti: mem 2,236,962 bcmem
> 4,473,924 icmem 6,710,886...httpd tcp!127.1!8000...init...icache 6,710,886
> bytes = 66,728 entries; 4 scache
> sync...announce tcp!127.1!17034...serving.
> fossil(#S/sdC0/fossil)...fsys: dialing venti at tcp!127.1!17034
> version...can't stat /srv/partfs.sdXX: '/srv/partfs.sdXX' file does not exist
>
> init: starting /bin/rc
> secstore
> mkvbe: '/dev/realmode' file does not exist
> aux/vga: controller not in /lib/vgadb, not vesa
> 0xC0000 55 AA 4D E9 90 55 CC 00 00 00 00 00 00 00 00 00 U.M..U..........
> 0xC0010 00 00 00 00 00 00 00 00 5C 98 00 00 00 00 49 42 ........\.....IB
> 0xC0020 4D 00 2E 8B 16 E8 98 85 D2 74 01 EE C2 02 00 84 M........t......
> 0xC0030 C0 74 34 66 55 66 89 E5 66 53 66 89 C3 66 B8 00 .t4fUf..fSf..f..
> 0xC0040 40 00 00 FE CB 74 37 66 0F B7 D2 66 0F B7 C9 66 @....t7f...f...f
> 0xC0050 0F AF D1 66 C1 FA 03 66 89 D0 9C 66 05 FF 1F 00 ...f...f...f....
> 0xC0060 00 9D 25 00 E0 EB 17 0F AF CA 66 89 C8 9C 66 D1 ..%.......f...f.
> 0xC0070 E0 66 05 FF 07 00 00 9D 25 00 F8 C2 02 00 66 5B .f......%.....f[
> 0xC0080 66 5D C2 02 00 66 55 66 89 E5 66 56 66 53 66 89 f]...fUf..fVfSf.
> 0xC0090 C6 66 89 D3 66 89 CA 67 66 8B 4D 08 67 8A 45 0C .f..f..gf.M.g.E.
> 0xC00A0 66 C1 E6 10 66 0F B7 DB 66 09 F3 66 31 F6 8E C6 f...f...f..f1...
> 0xC00B0 26 66 89 1E 0C 01 80 F9 01 74 0D 80 F9 03 74 0C &f.......t....t.
> 0xC00C0 84 C9 74 0A B0 19 EB 06 B0 0E EB 02 B0 2B 66 B9 ..t..........+f.
> 0xC00D0 40 00 00 00 8E C1 66 48 26 A2 84 00 8E C1 66 0F @.....fH&.....f.
> 0xC00E0 B6 D2 26 89 16 85 00 66 5B 66 5E 66 5D C2 02 00 ..&....f[f^f]...
> 0xC00F0 66 55 66 89 E5 66 57 66 56 66 53 66 53 66 89 C3 fUf..fWfVfSfSf..
> aux/vga: main: vga@1024x768x1 not in /lib/vgadb
> rio: can't open display: initdisplay: /dev/draw/new: no frame buffer
> init: rc exit status: rio 41: display open
>
> init: starting /bin/rc
> term%
>
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