Crash (SIGSEGV) in 6g (probably in libc due to incorrect arguments to some function) #1697
Description
by robert.swiecki:
Before filing a bug, please check whether it has been fixed since the latest release: run "hg pull -u" and retry what you did to reproduce the problem. Thanks. What steps will reproduce the problem? 1. Type - 6g SIGSEGV.PC.0x7ffff785a052.CODE.128.ADDR.(nil).INSTR.pcmpeqb_xmm2,_[rdi].go What is the expected output? Output file created What do you see instead? Crash - SIGSEGV at address 0, with instruction pcmpeqb_xmm2,_[rdi] (rdi == 0) Sometimes it doesn't crash (probably depends on layout of memory), then valgrind output is useful: $ valgrind /usr/local/google/src/go/bin/6g SIGSEGV.PC.0x7ffff785a052.CODE.128.ADDR.\(nil\).INSTR.pcmpeqb_xmm2\,_\[rdi\].go ==31360== Invalid read of size 1 ==31360== at 0x4C286D2: __GI_strlen (mc_replace_strmem.c:284) ==31360== by 0x43F4D7: fmtstrcpy (dofmt.c:281) ==31360== by 0x43F8F1: __fmtdispatch (fmt.c:229) ==31360== by 0x43F72B: dofmt (dofmt.c:80) ==31360== by 0x43FEF8: fmtvprint (fmtvprint.c:41) ==31360== by 0x423AE9: adderr (subr.c:50) ==31360== by 0x423F7D: yyerror (subr.c:175) ==31360== by 0x42AE4A: typecheck (typecheck.c:409) ==31360== by 0x429E74: typecheck (typecheck.c:363) ==31360== by 0x429E58: typecheck (typecheck.c:362) ==31360== by 0x42997E: typecheck (typecheck.c:1234) ==31360== by 0x42CBA9: typechecklist (typecheck.c:56) ==31360== Address 0x20676e697373696d is not stack'd, malloc'd or (recently) free'd ==31360== Which compiler are you using (5g, 6g, 8g, gccgo)? 6g Which operating system are you using? Linux/amd64 Which revision are you using? (hg identify) c5c62aeb6267 tip Please provide any additional information below.
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