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Fri, 02 Jan 2026 08:57:22 -0800 (PST) MIME-Version: 1.0 References: <76dc431876c6bb2386a87456b28f9a1f@gmail.com> In-Reply-To: From: Ron Minnich Date: Fri, 2 Jan 2026 08:57:12 -0800 X-Gm-Features: AQt7F2rie1NfzUhj2wMFXXEORf0xeageuoxMn-CA090VbnaqlAsuY0OkLyVse0Y 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 an admin; group holds all messages Topicbox-Message-UUID: 1ced6262-e7fc-11f0-89fe-c91a6cc11ef0 Archived-At: =?UTF-8?B?PGh0dHBzOi8vOWZhbnMudG9waWNib3guY29tL2dyb3Vwcy85?= =?UTF-8?B?ZmFucy9UMGJlYTc1OGVkNzU5YzhkNS1NZWI0ZWMzN2JmZDVhODMxNzFmZGMx?= =?UTF-8?B?OWVhPg==?= 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:Meb4ec37bfd5a83171fdc19ea:1:T82B9jKxF--DTCDGoXo6asibJ6ZLyW_N69SaN7Ov8dk btw, cdid you get a stack trace from the go runtime? or just that one l ine diagnostic? On Fri, Jan 2, 2026 at 8:19=E2=80=AFAM ron minnich wro= te: > > I wonder why that exception is enabled? I wonder what is enabling it? > Does the go runtime turn it on? > > on linux, mxcsr is 0x1f80, all exceptions masked, and in particular, 0x20= is not set -- no precision exceptions. > > 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=3D0x21= 5443 >>=20 >> Plan 9 >> mmuinit: vmstart 0xfffffffff0000000 vmunused 0xfffffffff03cc000 vmunmapp= ed 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 bcme= m 4,473,924 icmem 6,710,886...httpd tcp!127.1!8000...init...icache 6,710,88= 6 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 = exist >>=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 / see discussions + participants + delivery options Permali= nk ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/T0bea758ed759c8d5-Meb4ec= 37bfd5a83171fdc19ea Delivery options: https://9fans.topicbox.com/groups/9fans/subscription