[Bug rtl-optimization/117999] New: libgo regressions on arm after g:75e7d1600f47859df40b2ac0feff5a71e0dbb040

[clyon at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117999

            Bug ID: 117999
           Summary: libgo regressions on arm after
                    g:75e7d1600f47859df40b2ac0feff5a71e0dbb040
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: clyon at gcc dot gnu.org
                CC: vmakarov at redhat dot com
  Target Milestone: ---
            Target: arm

After commit g:75e7d1600f47859df40b2ac0feff5a71e0dbb040 , the Linaro CI
detected regressions in libgo tests on arm-linux-gnueabihf:

FAIL: crypto/tls 
FAIL: crypto/x509 

the log says:
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xf755abbe]

goroutine 1 [running]:
crypto_1elliptic_1internal_1nistec.P521Point.Set
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gcc.git~master/libgo/go/crypto/elliptic/internal/nistec/p521.go:70
crypto_1elliptic_1internal_1nistec.NewP521Generator
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gcc.git~master/libgo/go/crypto/elliptic/internal/nistec/p521.go:65
crypto_1elliptic.p521Curve.ScalarBaseMult
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gcc.git~master/libgo/go/crypto/elliptic/p521.go:147
crypto/x509.parseECPrivateKey
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gcc.git~master/libgo/go/crypto/x509/sec1.go:117
crypto_1x509.ParseECPrivateKey
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gcc.git~master/libgo/go/crypto/x509/sec1.go:35
crypto_1tls..import
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/builds/armv8l-unknown-linux-gnueabihf/armv8l-unknown-linux-gnueabihf/gcc-gcc.git~master-stage2/armv8l-unknown-linux-gnueabihf/libgo/gotest3208790/test/handshake_test.go:451
FAIL: crypto/tls
--- FAIL: TestPKCS8 (0.01s)
panic: runtime error: invalid memory address or nil pointer dereference
[recovered]
        panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x47a58]

goroutine 65 [running]:
testing.tRunner..func3
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gcc.git~master/libgo/go/testing/testing.go:1425
testing.tRunner..func1
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gcc.git~master/libgo/go/testing/testing.go:1342
panic
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gcc.git~master/libgo/go/runtime/panic.go:714
crypto_1elliptic_1internal_1nistec.P521Point.Set
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gcc.git~master/libgo/go/crypto/elliptic/internal/nistec/p521.go:70
crypto_1elliptic_1internal_1nistec.NewP521Generator
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gcc.git~master/libgo/go/crypto/elliptic/internal/nistec/p521.go:65
crypto_1elliptic.p521Curve.ScalarBaseMult
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gcc.git~master/libgo/go/crypto/elliptic/p521.go:147
crypto/x509.parseECPrivateKey
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/builds/armv8l-unknown-linux-gnueabihf/armv8l-unknown-linux-gnueabihf/gcc-gcc.git~master-stage2/armv8l-unknown-linux-gnueabihf/libgo/gotest3211815/test/sec1.go:117
crypto_1x509.ParsePKCS8PrivateKey
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/builds/armv8l-unknown-linux-gnueabihf/armv8l-unknown-linux-gnueabihf/gcc-gcc.git~master-stage2/armv8l-unknown-linux-gnueabihf/libgo/gotest3211815/test/pkcs8.go:58
crypto_1x509.TestPKCS8
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/builds/armv8l-unknown-linux-gnueabihf/armv8l-unknown-linux-gnueabihf/gcc-gcc.git~master-stage2/armv8l-unknown-linux-gnueabihf/libgo/gotest3211815/test/pkcs8_test.go:96
testing.tRunner
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gcc.git~master/libgo/go/testing/testing.go:1475
created by testing.T.Run
       
/home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gcc.git~master/libgo/go/testing/testing.go:1522
+0x19c
FAIL: crypto/x509