On 9front, the mxcsr is set to 1900. The value you are reporting is surprising.
On Fri, Jan 2, 2026 at 9:12 AM Ron Minnich <[email protected]> wrote: > 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 AM ron minnich <[email protected]> wrote: > > > > 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 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% > >> > > > > 9fans / 9fans / see discussions + participants + delivery options > Permalink ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/T0bea758ed759c8d5-M67eb67746d8aeab325537a31 Delivery options: https://9fans.topicbox.com/groups/9fans/subscription
