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@@ -0,0 +1,72 @@
+
+Go programs crash on qemu-sh4 due to issues with atomics
+
+After #1738545 [1] was fixed, Go applications work fine on qemu-arm but still crash on qemu-sh4. From the backtrace, it looks like an issue with the atomics in qemu-sh4:
+
+(sid-sh4-sbuild)root@epyc:/# cat hello.go
+package main
+
+import "fmt"
+
+func main() {
+      fmt.Println("hello world")
+}
+
+(sid-sh4-sbuild)root@epyc:/# gccgo-9 hello.go -o hello
+(sid-sh4-sbuild)root@epyc:/# ./hello 
+panic: (        runtime runtime.errorString) (0x7f74527c,0x80a038)
+fatal error: panic on system stack
+panic: (        runtime runtime.errorString) (0x7f74527c,0x80a038)
+fatal error: panic on system stack
+
+runtime stack:
+runtime..z2finternal..z2fatomic.Load64
+        ../../../src/libgo/go/runtime/internal/atomic/atomic.c:37
+runtime_mstart
+        ../../../src/libgo/runtime/proc.c:596
+
+goroutine 1 [running]:
+        goroutine running on other thread; stack unavailable
+
+runtime stack:
+runtime..z2finternal..z2fatomic.Load64
+        ../../../src/libgo/go/runtime/internal/atomic/atomic.c:37
+runtime_mstart
+        ../../../src/libgo/runtime/proc.c:596
+(sid-sh4-sbuild)root@epyc:/#
+
+The same sample Go program runs fine on my SH7785LCR SH4 evaluation board:
+
+root@tirpitz:~> uname -a
+Linux tirpitz 3.16.7-ckt7 #8 PREEMPT Fri Oct 21 18:47:41 CEST 2016 sh4a GNU/Linux
+root@tirpitz:~> cat hello.go
+package main
+
+import "fmt"
+
+func main() {
+      fmt.Println("hello world")
+}
+
+root@tirpitz:~> gccgo-9 hello.go -o hello
+root@tirpitz:~> ./hello 
+hello world
+root@tirpitz:~>
+
+Please note: In order to be able to reproduce this, one also needs to revert commit 61dedf2af7 [2], otherwise the Go application crashes differently:
+
+(sid-sh4-sbuild)root@epyc:/# ./hello        
+Unhandled trap: 0x180
+pc=0x7e5f7f9e sr=0x00000000 pr=0x7ee3d582 fpscr=0x00080004
+spc=0x00000000 ssr=0x00000000 gbr=0x7e590480 vbr=0x00000000
+sgr=0x00000000 dbr=0x00000000 delayed_pc=0x7e5f7f60 fpul=0x00034f3b
+r0=0x008007d4 r1=0x00000000 r2=0xfffe0b2a r3=0x00000002
+r4=0x008006e4 r5=0x00872000 r6=0x00200000 r7=0x00000000
+r8=0x7f7bca7c r9=0x7fffebd4 r10=0x00800480 r11=0x7f7bc0f0
+r12=0x7f7a3fa4 r13=0x008004c0 r14=0x7f7b2238 r15=0x7fffebd0
+r16=0x00000000 r17=0x00000000 r18=0x00000000 r19=0x00000000
+r20=0x00000000 r21=0x00000000 r22=0x00000000 r23=0x00000000
+(sid-sh4-sbuild)root@epyc:/#
+
+> [1] https://bugs.launchpad.net/bugs/1738545
+> [2] https://bugs.launchpad.net/bugs/1796520
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