Ah. I see that racebuild is just a thin wrapper around a shell script. Ok. So I tried to execute that shell script manually. I find a race in that build of the race detector... full irony!
jaten@rog /usr $ cd local/dev-go/go/ jaten@rog /usr/local/dev-go/go (go1.25-goj) $ ls api CONTRIBUTING.md lib PATENTS SECURITY.md VERSION bin doc LICENSE pkg src VERSION~ codereview.cfg go.env misc README.md test jaten@rog /usr/local/dev-go/go (go1.25-goj) $ cd .. jaten@rog /usr/local/dev-go $ mkdir tmp jaten@rog /usr/local/dev-go $ cd tmp jaten@rog /usr/local/dev-go/tmp $ curl -L -o llvm.zip https://github.com/llvm/llvm-project/archive/46e3ec0244c4d75a57cd635a28a9d5cbaee67c3d.zip % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0 100 318M 0 318M 0 0 6697k 0 --:--:-- 0:00:48 --:--:-- 6865k jaten@rog /usr/local/dev-go/tmp $ unzip -q llvm.zip llvm-project-46e3ec0244c4d75a57cd635a28a9d5cbaee67c3d/compiler-rt/* jaten@rog /usr/local/dev-go/tmp $ ls llvm-project-46e3ec0244c4d75a57cd635a28a9d5cbaee67c3d llvm.zip jaten@rog /usr/local/dev-go/tmp $ cd llvm-project-46e3ec0244c4d75a57cd635a28a9d5cbaee67c3d/ jaten@rog /usr/local/dev-go/tmp/llvm-project-46e3ec0244c4d75a57cd635a28a9d5cbaee67c3d $ cd compiler-rt/lib/tsan/go jaten@rog /usr/local/dev-go/tmp/llvm-project-46e3ec0244c4d75a57cd635a28a9d5cbaee67c3d/compiler-rt/lib/tsan/go $ ls build.bat buildgo.sh test.c tsan_go.cpp jaten@rog /usr/local/dev-go/tmp/llvm-project-46e3ec0244c4d75a57cd635a28a9d5cbaee67c3d/compiler-rt/lib/tsan/go $ ./buildgo.sh In file included from ../rtl/tsan_sync.h:19, from ../rtl/tsan_rtl.h:47, from tsan_go.cpp:13: ../rtl/tsan_dense_alloc.h: In instantiation of ‘void __tsan::DenseSlabAlloc< <template-parameter-1-1>, <anonymous>, <anonymous>, <anonymous> >::Drain(Cache*) [with T = __tsan::MBlock; long unsigned int kL1Size = 262144; long unsigned int kL2Size = 4096; long long unsigned int kReserved = 3221225472; Cache = __tsan::DenseSlabAllocCache]’: ../rtl/tsan_dense_alloc.h:77:7: required from ‘void __tsan::DenseSlabAlloc< <template-parameter-1-1>, <anonymous>, <anonymous>, <anonymous> >::Free(Cache*, IndexT) [with T = __tsan::MBlock; long unsigned int kL1Size = 262144; long unsigned int kL2Size = 4096; long long unsigned int kReserved = 3221225472; Cache = __tsan::DenseSlabAllocCache; IndexT = unsigned int]’ ../rtl/tsan_sync.cpp:84:26: required from here ../rtl/tsan_dense_alloc.h:165:46: warning: suggest parentheses around arithmetic in operand of ‘|’ [ ]8;;https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wparentheses -Wparentheses ]8;; ] 165 | xchg = head_idx | (cmp & kCounterMask) + kCounterInc; | ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~ ../rtl/tsan_dense_alloc.h: In instantiation of ‘void __tsan::DenseSlabAlloc< <template-parameter-1-1>, <anonymous>, <anonymous>, <anonymous> >::Drain(Cache*) [with T = __tsan::SyncVar; long unsigned int kL1Size = 1048576; long unsigned int kL2Size = 1024; long long unsigned int kReserved = 3221225472; Cache = __tsan::DenseSlabAllocCache]’: ../rtl/tsan_dense_alloc.h:77:7: required from ‘void __tsan::DenseSlabAlloc< <template-parameter-1-1>, <anonymous>, <anonymous>, <anonymous> >::Free(Cache*, IndexT) [with T = __tsan::SyncVar; long unsigned int kL1Size = 1048576; long unsigned int kL2Size = 1024; long long unsigned int kReserved = 3221225472; Cache = __tsan::DenseSlabAllocCache; IndexT = unsigned int]’ ../rtl/tsan_sync.cpp:92:25: required from here ../rtl/tsan_dense_alloc.h:165:46: warning: suggest parentheses around arithmetic in operand of ‘|’ [ ]8;;https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wparentheses -Wparentheses ]8;; ] cc1plus: note: unrecognized command-line option ‘-Wno-unknown-warning-option’ may have been intended to silence earlier diagnostics gcc gotsan.cpp -c -o ./race_linux_amd64.syso -I../rtl -I../.. -I../../sanitizer_common -I../../../include -std=c++17 -Wall -fno-exceptions -fno-rtti -DSANITIZER_GO=1 -DSANITIZER_DEADLOCK_DETECTOR_VERSION=2 -fPIC -Wno-maybe-uninitialized -ffreestanding -Wno-unused-const-variable -Wno-unknown-warning-option -m64 -msse3 -DSANITIZER_DEBUG=0 -O3 -fomit-frame-pointer In file included from ../rtl/tsan_sync.h:19, from ../rtl/tsan_rtl.h:47, from tsan_go.cpp:13: ../rtl/tsan_dense_alloc.h: In instantiation of ‘void __tsan::DenseSlabAlloc< <template-parameter-1-1>, <anonymous>, <anonymous>, <anonymous> >::Drain(Cache*) [with T = __tsan::MBlock; long unsigned int kL1Size = 262144; long unsigned int kL2Size = 4096; long long unsigned int kReserved = 3221225472; Cache = __tsan::DenseSlabAllocCache]’: ../rtl/tsan_dense_alloc.h:77:7: required from ‘void __tsan::DenseSlabAlloc< <template-parameter-1-1>, <anonymous>, <anonymous>, <anonymous> >::Free(Cache*, IndexT) [with T = __tsan::MBlock; long unsigned int kL1Size = 262144; long unsigned int kL2Size = 4096; long long unsigned int kReserved = 3221225472; Cache = __tsan::DenseSlabAllocCache; IndexT = unsigned int]’ ../rtl/tsan_sync.cpp:84:26: required from here ../rtl/tsan_dense_alloc.h:165:46: warning: suggest parentheses around arithmetic in operand of ‘|’ [ ]8;;https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wparentheses -Wparentheses ]8;; ] 165 | xchg = head_idx | (cmp & kCounterMask) + kCounterInc; | ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~ ../rtl/tsan_dense_alloc.h: In instantiation of ‘void __tsan::DenseSlabAlloc< <template-parameter-1-1>, <anonymous>, <anonymous>, <anonymous> >::Drain(Cache*) [with T = __tsan::SyncVar; long unsigned int kL1Size = 1048576; long unsigned int kL2Size = 1024; long long unsigned int kReserved = 3221225472; Cache = __tsan::DenseSlabAllocCache]’: ../rtl/tsan_dense_alloc.h:77:7: required from ‘void __tsan::DenseSlabAlloc< <template-parameter-1-1>, <anonymous>, <anonymous>, <anonymous> >::Free(Cache*, IndexT) [with T = __tsan::SyncVar; long unsigned int kL1Size = 1048576; long unsigned int kL2Size = 1024; long long unsigned int kReserved = 3221225472; Cache = __tsan::DenseSlabAllocCache; IndexT = unsigned int]’ ../rtl/tsan_sync.cpp:92:25: required from here ../rtl/tsan_dense_alloc.h:165:46: warning: suggest parentheses around arithmetic in operand of ‘|’ [ ]8;;https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wparentheses -Wparentheses ]8;; ] cc1plus: note: unrecognized command-line option ‘-Wno-unknown-warning-option’ may have been intended to silence earlier diagnostics ================== WARNING: DATA RACE Read at 0x00c011110000 by goroutine 2: <null>() <null>:0 +0x0 Previous write at 0x00c011110000 by main goroutine: <null>() <null>:0 +0x0 <null>() <null>:0 +0x0 Goroutine 2 (running) created at: <null>() <null>:0 +0x0 ================== Found 1 data race(s) jaten@rog /usr/local/dev-go/tmp/llvm-project-46e3ec0244c4d75a57cd635a28a9d5cbaee67c3d/compiler-rt/lib/tsan/go $ On Monday, July 7, 2025 at 3:22:43 PM UTC+2 Jason E. Aten wrote: > I'm trying to characterize the race-detector/tsan corruption > bugs found in https://github.com/golang/go/issues/74019, > on the latest pre-release of go1.25 (at > b062eb46e8e76ad39029d0c1b13e4eb81c692c20 > which is tagged as "*release-branch.go1.25").* > > I tried to follow the Go src/runtime/race/README instructions > to update the race detector to the latest in the llvm repo, since it > is 20 months old, and maybe there have been fixes applied( probably > wishful thinking, but worth a quick try...), but I'm not having any luck > with "racebuild": > > *jaten@rog **/usr/local/dev-go/go/src/runtime/race **(go1.25-goj) **$* > *racebuild > -goroot /u**sr/local/dev-go/go -platforms darwin/amd64v1 -rev > 46e3ec0244c4d75a57cd635a28a9d5cb**aee67c3d* > > 2025/07/07 08:12:24 using Go revision: > b062eb46e8e76ad39029d0c1b13e4eb81c692c20 > > 2025/07/07 08:12:24 darwin/amd64v1: gomote [create -status=false > gotip-darwin-amd64_14] > > Please visit https://www.google.com/device in your browser and enter > verification code: > > XXX-XXX-XXXX > > # Error running create: failed to create buildlet (1): rpc error: code = > PermissionDenied desc = unexpected HTTP status code received from server: > 403 (Forbidden); transport: received unexpected content-type "text/html; > charset=UTF-8" > > 2025/07/07 08:13:34 darwin/amd64v1: gomote [create -status=false > gotip-darwin-amd64_14] failed: > > Please visit https://www.google.com/device in your browser and enter > verification code: > > XXX-XXX-XXXX > > # Error running create: failed to create buildlet (1): rpc error: code = > PermissionDenied desc = unexpected HTTP status code received from server: > 403 (Forbidden); transport: received unexpected content-type "text/html; > charset=UTF-8" > > 2025/07/07 08:13:34 darwin/amd64v1: instance creation failed, retrying > > 2025/07/07 08:13:34 darwin/amd64v1: gomote [create -status=false > gotip-darwin-amd64_14] > > # Error running create: failed to create buildlet (1): rpc error: code = > Permission\ > > Denied desc = unexpected HTTP status code received from server: 403 > (Forbidden); tr\ > > ansport: received unexpected content-type "text/html; charset=UTF-8" > > 2025/07/07 08:13:35 darwin/amd64v1: gomote [create -status=false > gotip-darwin-amd64_14] failed: > > # Error running create: failed to create buildlet (1): rpc error: code = > Permission\ > > Denied desc = unexpected HTTP status code received from server: 403 > (Forbidden); tr\ > > ansport: received unexpected content-type "text/html; charset=UTF-8" > > 2025/07/07 08:13:35 darwin/amd64v1: instance creation failed, retrying > > 2025/07/07 08:13:35 darwin/amd64v1: gomote [create -status=false > gotip-darwin-amd64_14] > > ... lots more of the same, after signing into my gmail... > > Is it possible to do this locally and not with the Go distributed build > system? > > Thanks! > > Jason > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. 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