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Sat, 03 Jan 2026 18:38:07 -0800 (PST) MIME-Version: 1.0 References: <76dc431876c6bb2386a87456b28f9a1f@gmail.com> In-Reply-To: <76dc431876c6bb2386a87456b28f9a1f@gmail.com> From: Skip Tavakkolian Date: Sat, 3 Jan 2026 18:37:55 -0800 X-Gm-Features: AQt7F2oZZXDfz7P1dyZqxZefuSfD8BlAm916Em2PlVeUQsQJOundHQ6bkiZQlMs Message-ID: Subject: Re: [9fans] go floating point exception To: 9fans <9fans@9fans.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Topicbox-Policy-Reasoning: moderate: sender is a member; group holds all messages Topicbox-Message-UUID: 696165e2-e916-11f0-841d-8b276cc11ef0 Archived-At: =?UTF-8?B?PGh0dHBzOi8vOWZhbnMudG9waWNib3guY29tL2dyb3Vwcy85?= =?UTF-8?B?ZmFucy9UMGJlYTc1OGVkNzU5YzhkNS1NYjBkZTMyNDk4ZDA1N2RkOGJhYjdi?= =?UTF-8?B?ZGJmPg==?= List-Help: List-Id: "9fans" <9fans.9fans.net> List-Post: List-Software: Topicbox v0 List-Subscribe: Precedence: list Reply-To: 9fans <9fans@9fans.net> List-Unsubscribe: , Topicbox-Delivery-ID: 2:9fans:437d30aa-c441-11e9-8a57-d036212d11b0:522be890-2105-11eb-b15e-8d699134e1fa:Mb0de32498d057dd8bab7bdbf:1:G2TTx3gmlYUMnP1BhRUE2clBsKncMXSjndSdLSbmgBY 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=E2=80=AFAM wrote: >=20 > 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 >=20 > 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=3D0x20 pc=3D0x215= 443 >=20 > Plan 9 > mmuinit: vmstart 0xfffffffff0000000 vmunused 0xfffffffff03cc000 vmunmappe= d 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=3D0 base=3D0xe000000 size=3D0x71fe0000 > 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 #=C3=A6...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 =3D 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 e= xist >=20 > 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 >=20 > init: starting /bin/rc > term% >=20 ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/T0bea758ed759c8d5-Mb0de3= 2498d057dd8bab7bdbf Delivery options: https://9fans.topicbox.com/groups/9fans/subscription