{"action":"created","issue":{"url":"https://api.github.com/repos/golang/go/issues/16939","repository_url":"https://api.github.com/repos/golang/go","labels_url":"https://api.github.com/repos/golang/go/issues/16939/labels{/name}","comments_url":"https://api.github.com/repos/golang/go/issues/16939/comments","events_url":"https://api.github.com/repos/golang/go/issues/16939/events","html_url":"https://github.com/golang/go/issues/16939","id":174367126,"number":16939,"title":"runtime: regression in memmove","user":{"login":"dsnet","id":6354026,"avatar_url":"https://avatars.githubusercontent.com/u/6354026?v=3","gravatar_id":"","url":"https://api.github.com/users/dsnet","html_url":"https://github.com/dsnet","followers_url":"https://api.github.com/users/dsnet/followers","following_url":"https://api.github.com/users/dsnet/following{/other_user}","gists_url":"https://api.github.com/users/dsnet/gists{/gist_id}","starred_url":"https://api.github.com/users/dsnet/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dsnet/subscriptions","organizations_url":"https://api.github.com/users/dsnet/orgs","repos_url":"https://api.github.com/users/dsnet/repos","events_url":"https://api.github.com/users/dsnet/events{/privacy}","received_events_url":"https://api.github.com/users/dsnet/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":{"url":"https://api.github.com/repos/golang/go/milestones/38","html_url":"https://github.com/golang/go/milestones/Go1.8","labels_url":"https://api.github.com/repos/golang/go/milestones/38/labels","id":1709363,"number":38,"title":"Go1.8","description":"","creator":{"login":"griesemer","id":8528975,"avatar_url":"https://avatars.githubusercontent.com/u/8528975?v=3","gravatar_id":"","url":"https://api.github.com/users/griesemer","html_url":"https://github.com/griesemer","followers_url":"https://api.github.com/users/griesemer/followers","following_url":"https://api.github.com/users/griesemer/following{/other_user}","gists_url":"https://api.github.com/users/griesemer/gists{/gist_id}","starred_url":"https://api.github.com/users/griesemer/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/griesemer/subscriptions","organizations_url":"https://api.github.com/users/griesemer/orgs","repos_url":"https://api.github.com/users/griesemer/repos","events_url":"https://api.github.com/users/griesemer/events{/privacy}","received_events_url":"https://api.github.com/users/griesemer/received_events","type":"User","site_admin":false},"open_issues":456,"closed_issues":137,"state":"open","created_at":"2016-04-15T16:30:23Z","updated_at":"2016-08-31T22:49:16Z","due_on":"2017-02-01T08:00:00Z","closed_at":null},"comments":4,"created_at":"2016-08-31T20:13:15Z","updated_at":"2016-09-01T01:44:59Z","closed_at":null,"body":"Commit 3607c5f4f18ad4d423e40996ebf7f46b2f79ce02 caused a regression.\r\n\r\nOn my machine, running in a VM:\r\nKernel: `Linux 3.13.0-37-generic`\r\nCPU: `Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz`\r\nCPU flags: `fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx rdtscp lm constant_tsc rep_good nopl pni ssse3 lahf_lm`\r\n\r\nI see the following crash (using golang/text@09c7ea1fcb3345da09be5a32c9c52303acd1dc2c):\r\n```\r\n$ go.tip test golang.org/x/text/search\r\nsignal: illegal instruction\r\nFAIL\tgolang.org/x/text/search\t0.002\r\n```\r\n\r\nRunning with gdb indicates that it's in memmove.s\r\n```\r\n$ gdb ./search.test\r\nStarting program: /home/rawr/search.test \r\n\r\nProgram received signal SIGILL, Illegal instruction.\r\nruntime.memmove () at /usr/local/go.tip/src/runtime/memmove_amd64.s:345\r\n345\t\tVMOVDQU\t(SI), Y4\r\n```\r\n\r\n\\cc @randall77 @dvnagorny\r\n"},"comment":{"url":"https://api.github.com/repos/golang/go/issues/comments/243953158","html_url":"https://github.com/golang/go/issues/16939#issuecomment-243953158","issue_url":"https://api.github.com/repos/golang/go/issues/16939","id":243953158,"user":{"login":"diegomontoya","id":417764,"avatar_url":"https://avatars.githubusercontent.com/u/417764?v=3","gravatar_id":"","url":"https://api.github.com/users/diegomontoya","html_url":"https://github.com/diegomontoya","followers_url":"https://api.github.com/users/diegomontoya/followers","following_url":"https://api.github.com/users/diegomontoya/following{/other_user}","gists_url":"https://api.github.com/users/diegomontoya/gists{/gist_id}","starred_url":"https://api.github.com/users/diegomontoya/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/diegomontoya/subscriptions","organizations_url":"https://api.github.com/users/diegomontoya/orgs","repos_url":"https://api.github.com/users/diegomontoya/repos","events_url":"https://api.github.com/users/diegomontoya/events{/privacy}","received_events_url":"https://api.github.com/users/diegomontoya/received_events","type":"User","site_admin":false},"created_at":"2016-09-01T01:44:59Z","updated_at":"2016-09-01T01:44:59Z","body":"For my non-vm system, ./make.bash core dumps with tip (69e7e8a696825fa818b70587563ac68e52f8b1a1) . Same build with yesterday's master was fine. Related or same issue.\r\n\r\n````\r\n./make.bash: line 173:  2117 Illegal instruction     (core dumped) CC=$CC_FOR_TARGET \"$GOTOOLDIR\"/go_bootstrap install $GO_FLAGS -gcflags \"$GO_GCFLAGS\" -ldflags \"$GO_LDFLAGS\" -v std cmd\r\n```\r\n\r\n```\r\nmodel name\t: Intel(R) Xeon(R) CPU           X3440  @ 2.53GHz\r\nstepping\t: 5\r\nmicrocode\t: 0x7\r\ncpu MHz\t\t: 2533.216\r\ncache size\t: 8192 KB\r\nphysical id\t: 0\r\nsiblings\t: 8\r\ncore id\t\t: 3\r\ncpu cores\t: 4\r\napicid\t\t: 7\r\ninitial apicid\t: 7\r\nfpu\t\t: yes\r\nfpu_exception\t: yes\r\ncpuid level\t: 11\r\nwp\t\t: yes\r\nflags\t\t: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm tpr_shadow vnmi flexpriority ept vpid dtherm\r\nbugs\t\t:\r\nbogomips\t: 5065.89\r\nclflush size\t: 64\r\ncache_alignment\t: 64\r\naddress sizes\t: 36 bits physical, 48 bits virtual\r\n```\r\n"}}
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