https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61620
Bug ID: 61620
Summary: FAIL: go.test/test/fixedbugs/bug242.go execution, -O2
-g
Product: gcc
Version: 4.10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: go
Assignee: ian at airs dot com
Reporter: ubizjak at gmail dot com
CC: cmang at google dot com
Execute of go.test/test/fixedbugs/bug242.go fails on i686-linux-gnu with "fatal
error: freeing too small block".
[uros@localhost test]$ LD_LIBRARY_PATH=. gdb ./bug242.x
GNU gdb (GDB) Fedora 7.7.1-13.fc20
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Reading symbols from ./bug242.x...done.
(gdb) r
Starting program: /home/uros/test/bug242.x
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0xf756acc0 (LWP 5016)]
fatal error: freeing too small block
goroutine 16 [running]:
runtime_dopanic
/home/uros/gcc-svn/trunk/libgo/runtime/panic.c:129
runtime_throw
/home/uros/gcc-svn/trunk/libgo/runtime/panic.c:167
__go_free
/home/uros/gcc-svn/trunk/libgo/runtime/malloc.goc:366
__go_map_delete
/home/uros/gcc-svn/trunk/libgo/runtime/go-map-delete.c:50
runtime.mapdelete
/home/uros/gcc-svn/trunk/libgo/runtime/map.goc:47
main.main
/home/uros/gcc-svn/trunk/gcc/testsuite/go.test/test/fixedbugs/bug242.go:96
runtime_main
/home/uros/gcc-svn/trunk/libgo/runtime/proc.c:571
panic during panic
goroutine 16 [running]:
runtime_dopanic
/home/uros/gcc-svn/trunk/libgo/runtime/panic.c:129
runtime_startpanic
/home/uros/gcc-svn/trunk/libgo/runtime/panic.c:98
runtime_throw
/home/uros/gcc-svn/trunk/libgo/runtime/panic.c:165
runtime_mallocgc
/home/uros/gcc-svn/trunk/libgo/runtime/malloc.goc:115
__go_alloc
/home/uros/gcc-svn/trunk/libgo/runtime/malloc.goc:333
callback
/home/uros/gcc-svn/trunk/libgo/runtime/go-caller.c:47
dwarf_lookup_pc
/home/uros/gcc-svn/trunk/libbacktrace/dwarf.c:2838
dwarf_fileline
/home/uros/gcc-svn/trunk/libbacktrace/dwarf.c:2877
backtrace_pcinfo
/home/uros/gcc-svn/trunk/libbacktrace/fileline.c:176
__go_file_line
/home/uros/gcc-svn/trunk/libgo/runtime/go-caller.c:125
runtime_printcreatedby
/home/uros/gcc-svn/trunk/libgo/runtime/proc.c:636
runtime_dopanic
/home/uros/gcc-svn/trunk/libgo/runtime/panic.c:130
runtime_throw
/home/uros/gcc-svn/trunk/libgo/runtime/panic.c:167
__go_free
/home/uros/gcc-svn/trunk/libgo/runtime/malloc.goc:366
__go_map_delete
/home/uros/gcc-svn/trunk/libgo/runtime/go-map-delete.c:50
runtime.mapdelete
/home/uros/gcc-svn/trunk/libgo/runtime/map.goc:47
main.main
/home/uros/gcc-svn/trunk/gcc/testsuite/go.test/test/fixedbugs/bug242.go:96
runtime_main
/home/uros/gcc-svn/trunk/libgo/runtime/proc.c:571
stack trace unavailable
[Thread 0xf756acc0 (LWP 5016) exited]
[Inferior 1 (process 5012) exited with code 04]
Breakpoint in runtime_dopanic:
Breakpoint 1, runtime_dopanic (unused=0) at
/home/uros/gcc-svn/trunk/libgo/runtime/panic.c:114
114 {
(gdb) bt
#0 runtime_dopanic (unused=0) at
/home/uros/gcc-svn/trunk/libgo/runtime/panic.c:114
#1 0xf7978ddf in runtime_throw (s=0xf7c90526 "freeing too small block") at
/home/uros/gcc-svn/trunk/libgo/runtime/panic.c:167
#2 0xf7981f7d in __go_free (v=0x18204018) at
/home/uros/gcc-svn/trunk/libgo/runtime/malloc.goc:366
#3 0xf796a8a4 in __go_map_delete (map=0x18200000, key=0xf6f1cf39) at
/home/uros/gcc-svn/trunk/libgo/runtime/go-map-delete.c:50
#4 0xf7982d35 in runtime.mapdelete (h=0x18200000, key=0xf6f1cf39 "\r") at
/home/uros/gcc-svn/trunk/libgo/runtime/map.goc:47
#5 0x08049eb6 in main.main () at
/home/uros/gcc-svn/trunk/gcc/testsuite/go.test/test/fixedbugs/bug242.go:96
(gdb) f 2
#2 0xf7981f7d in __go_free (v=0x18204018) at
/home/uros/gcc-svn/trunk/libgo/runtime/malloc.goc:366
366 runtime_throw("freeing too small block");
(gdb) list
361 size = s->elemsize;
362 sizeclass = s->sizeclass;
363 // Objects that are smaller than TinySize can be allocated
using tiny alloc,
364 // if then such object is combined with an object with
finalizer, we will crash.
365 if(size < TinySize)
366 runtime_throw("freeing too small block");
367
368 if(raceenabled)
369 runtime_racefree(v);
370
(gdb) p size
$1 = 8
(gdb) p TinySize
$2 = TinySize
(gdb)
