[Bug go/84215] Random results in go/libgo tests

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84215

--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
On i686 with many cores, r257758 gave:

...
goroutine 24690 [GC worker (idle)]:
runtime.mcall
        /export/gnu/import/git/sources/gcc/libgo/runtime/proc.c:342
runtime.gopark
       
/export/build/gnu/gcc-32bit/build-i686-linux/i686-linux/libgo/gotest330678/test/proc.go:321
runtime.gcBgMarkWorker
       
/export/build/gnu/gcc-32bit/build-i686-linux/i686-linux/libgo/gotest330678/test/mgc.go:1776
runtime.kickoff
       
/export/build/gnu/gcc-32bit/build-i686-linux/i686-linux/libgo/gotest330678/test/proc.go:1161
created by runtime.gcBgMarkStartWorkers
       
/export/build/gnu/gcc-32bit/build-i686-linux/i686-linux/libgo/gotest330678/test/mgc.go:1722
+92

goroutine 23558 [running]:
        goroutine running on other thread; stack unavailable
created by testing.T.Run
        /export/gnu/import/git/sources/gcc/libgo/go/testing/testing.go:824 +740

goroutine 24113 [chan send]:
runtime.mcall
        /export/gnu/import/git/sources/gcc/libgo/runtime/proc.c:342
runtime.gopark
       
/export/build/gnu/gcc-32bit/build-i686-linux/i686-linux/libgo/gotest330678/test/proc.go:321
runtime.goparkunlock
       
/export/build/gnu/gcc-32bit/build-i686-linux/i686-linux/libgo/gotest330678/test/proc.go:327
runtime.chansend
       
/export/build/gnu/gcc-32bit/build-i686-linux/i686-linux/libgo/gotest330678/test/chan.go:249
runtime.chansend1
       
/export/build/gnu/gcc-32bit/build-i686-linux/i686-linux/libgo/gotest330678/test/chan.go:135
testing.tRunner..func1
        /export/gnu/import/git/sources/gcc/libgo/go/testing/testing.go:728
runtime.deferreturn
       
/export/build/gnu/gcc-32bit/build-i686-linux/i686-linux/libgo/gotest330678/test/panic.go:205
testing.tRunner
        /export/gnu/import/git/sources/gcc/libgo/go/testing/testing.go:783
runtime.kickoff
       
/export/build/gnu/gcc-32bit/build-i686-linux/i686-linux/libgo/gotest330678/test/proc.go:1161
created by testing.T.Run
        /export/gnu/import/git/sources/gcc/libgo/go/testing/testing.go:824 +740

eax    0x0
ebx    0x2
ecx    0xb93e1afc
edx    0x0
edi    0x0
esi    0x8
ebp    0xb93e1afc
esp    0xb93e1ae0
eip    0xf7f42db9
eflags 0x282
cs     0x23
fs     0x0
gs     0x63
FAIL: runtime

goroutine 4122 [IO wait]:
internal_poll.runtime_pollWait
        /export/gnu/import/git/sources/gcc/libgo/go/runtime/netpoll.go:176
internal_poll.pollDesc.wait
       
/export/gnu/import/git/sources/gcc/libgo/go/internal/poll/fd_poll_runtime.go:85
internal_poll.pollDesc.waitRead
       
/export/gnu/import/git/sources/gcc/libgo/go/internal/poll/fd_poll_runtime.go:90
internal_poll.FD.Accept
       
/export/gnu/import/git/sources/gcc/libgo/go/internal/poll/fd_unix.go:372
net.netFD.accept
        /export/gnu/import/git/sources/gcc/libgo/go/net/fd_unix.go:238
net.TCPListener.accept
        /export/gnu/import/git/sources/gcc/libgo/go/net/tcpsock_posix.go:136
net.TCPListener.Accept
        /export/gnu/import/git/sources/gcc/libgo/go/net/tcpsock.go:259
net_http.Server.Serve
       
/export/build/gnu/gcc-32bit/build-i686-linux/i686-linux/libgo/gotest249618/test/server.go:2770
httptest.func1
       
/export/gnu/import/git/sources/gcc/libgo/go/net/http/httptest/server.go:280
created by net_http_httptest.Server.goServe
       
/export/gnu/import/git/sources/gcc/libgo/go/net/http/httptest/server.go:278
+198

goroutine 4535 [semacquire]:
syscall.Accept4
       
/export/gnu/import/git/sources/gcc/libgo/go/syscall/libcall_linux.go:176
poll.accept
       
/export/gnu/import/git/sources/gcc/libgo/go/internal/poll/sock_cloexec.go:17
internal_poll.FD.Accept
       
/export/gnu/import/git/sources/gcc/libgo/go/internal/poll/fd_unix.go:365
net.netFD.accept
        /export/gnu/import/git/sources/gcc/libgo/go/net/fd_unix.go:238
net.TCPListener.accept
        /export/gnu/import/git/sources/gcc/libgo/go/net/tcpsock_posix.go:136
net.TCPListener.Accept
        /export/gnu/import/git/sources/gcc/libgo/go/net/tcpsock.go:259
crypto_tls.listener.Accept
        /export/gnu/import/git/sources/gcc/libgo/go/crypto/tls/tls.go:52
net_http.Server.Serve
       
/export/build/gnu/gcc-32bit/build-i686-linux/i686-linux/libgo/gotest249618/test/server.go:2770
httptest.func1
       
/export/gnu/import/git/sources/gcc/libgo/go/net/http/httptest/server.go:280
created by net_http_httptest.Server.goServe
       
/export/gnu/import/git/sources/gcc/libgo/go/net/http/httptest/server.go:278
+198

eax    0x0
ebx    0x2
ecx    0xce0f1fbc
edx    0x0
edi    0x0
esi    0x8
ebp    0xce0f1fbc
esp    0xce0f1fa0
eip    0xf7f3edb9
eflags 0x286
cs     0x23
fs     0x0
gs     0x63
FAIL: net/http

/tmp/cc2A9bsi.s: Assembler messages:
/tmp/cc2A9bsi.s:7954: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:7965: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:7976: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:7977: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:7978: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:7979: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:7993: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8004: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8015: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8016: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8017: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8018: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8032: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8043: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8054: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8055: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8056: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8057: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8071: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8082: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8093: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8094: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8095: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8096: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8110: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8121: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8132: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8133: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8134: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8135: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8149: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8160: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8171: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8172: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8173: Error: leb128 operand is an undefined symbol: .LVU443
/tmp/cc2A9bsi.s:8174: Error: leb128 operand is an undefined symbol: .LVU443


FAIL: golang_org/x/crypto/chacha20poly1305/internal/chacha20

FAIL: golang_org/x/crypto/curve25519
FAIL: golang_org/x/net/lex/httplex

checksyms: found unexpected symbol "__libc_start_main@@GLIBC_2.0"
FAIL: checksyms

spawn [open ...]^M
fatal error: unexpected signal during runtime execution
[signal SIGSEGV: segmentation violation code=2 addr=4140130304 pc=4152026464]

runtime stack:
doscanstack1
        /export/gnu/import/git/sources/gcc/libgo/runtime/stack.c:77
runtime_mstart
        /export/gnu/import/git/sources/gcc/libgo/runtime/proc.c:527

goroutine 33 [GC worker (idle)]:
created by runtime.gcStart
        /export/gnu/import/git/sources/gcc/libgo/go/runtime/mgc.go:1299 +412

goroutine 1 [GC assist marking (scan)]:
panic
        /export/gnu/import/git/sources/gcc/libgo/go/runtime/panic.go:462
runtime_panicstring
        /export/gnu/import/git/sources/gcc/libgo/runtime/panic.c:38
main.main..func1
        ./index0-out.go:140
main.test
        ./index0-out.go:112
main.main
        ./index0-out.go:140
FAIL: ./index0-out.go execution,  -O0 -g -fno-var-tracking-assignments