[Bug go/61871] FAIL: regexp from libgo testsuite on non-split stack targets

["ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61871

--- Comment #2 from UroÅ Bizjak <ubizjak at gmail dot com> ---
The backtrace mentions "malloc/free - deadlock" and the segmentation fault
happens later:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x200011d3270 (LWP 18336)]
0x0000020000e8bbac in memmove () from /lib/libc.so.6.1
(gdb) bt
#0  0x0000020000e8bbac in memmove () from /lib/libc.so.6.1
#1  0x00000200005b3a84 in gwrite (v=0x200009372f0, n=19) at
/home/uros/gcc-svn/trunk/libgo/runtime/print.c:38
#2  0x00000200005b4868 in runtime_printf (s=0x200008eab4c
<regexp_syntax.rune.pN22_regexp_syntax.compiler+204> ">")
    at /home/uros/gcc-svn/trunk/libgo/runtime/print.c:96
#3  0x00000200005b3014 in runtime_startpanic () at
/home/uros/gcc-svn/trunk/libgo/runtime/panic.c:97
#4  0x00000200005b3160 in runtime_throw (s=0x2000093820c "malloc/free -
deadlock") at /home/uros/gcc-svn/trunk/libgo/runtime/panic.c:189
#5  0x00000200005c01d4 in runtime_mallocgc (size=40, typ=0, flag=0) at
/home/uros/gcc-svn/trunk/libgo/runtime/malloc.goc:116
#6  0x00000200005a4b30 in __go_new (size=2199032605516) at
/home/uros/gcc-svn/trunk/libgo/runtime/go-new.c:15
#7  0x00000200008e9a34 in regexp_syntax.inst.pN22_regexp_syntax.compiler
(c=0x200009372f0, op=19 '\023')
    at /home/uros/gcc-svn/trunk/libgo/go/regexp/syntax/compile.go:173
#8  0x00000200008eaadc in regexp_syntax.rune.pN22_regexp_syntax.compiler
(c=0x200009372f0, r=..., flags=212)
    at /home/uros/gcc-svn/trunk/libgo/go/regexp/syntax/compile.go:267
#9  0x00000200008eaf20 in regexp_syntax.compile.pN22_regexp_syntax.compiler
(c=0xc208c1a988, re=0xc208b7fce0)
    at /home/uros/gcc-svn/trunk/libgo/go/regexp/syntax/compile.go:110
#10 0x00000200008eb628 in regexp_syntax.compile.pN22_regexp_syntax.compiler
(c=0xc208c1a988, re=<optimized out>)
    at /home/uros/gcc-svn/trunk/libgo/go/regexp/syntax/compile.go:154
#11 0x00000200008eb2f0 in regexp_syntax.compile.pN22_regexp_syntax.compiler
(c=0xc208c1a988, re=0xc208bb0f50)
    at /home/uros/gcc-svn/trunk/libgo/go/regexp/syntax/compile.go:146
#12 0x00000200008eb444 in regexp_syntax.compile.pN22_regexp_syntax.compiler
(c=0xc208c1a988, re=<optimized out>)
    at /home/uros/gcc-svn/trunk/libgo/go/regexp/syntax/compile.go:156
#13 0x00000200008eb2f0 in regexp_syntax.compile.pN22_regexp_syntax.compiler
(c=0xc208c1a988, re=0xc208bb1030)
    at /home/uros/gcc-svn/trunk/libgo/go/regexp/syntax/compile.go:146
#14 0x00000200008eb444 in regexp_syntax.compile.pN22_regexp_syntax.compiler
(c=0xc208c1a988, re=<optimized out>)
    at /home/uros/gcc-svn/trunk/libgo/go/regexp/syntax/compile.go:156
#15 0x00000200008eb2f0 in regexp_syntax.compile.pN22_regexp_syntax.compiler
(c=0xc208c1a988, re=0xc208bb1110)
    at /home/uros/gcc-svn/trunk/libgo/go/regexp/syntax/compile.go:146

...

#3822 0x00000200008eb444 in regexp_syntax.compile.pN22_regexp_syntax.compiler
(c=0xc208c1a988, re=<optimized out>)
    at /home/uros/gcc-svn/trunk/libgo/go/regexp/syntax/compile.go:156
#3823 0x00000200008eb2f0 in regexp_syntax.compile.pN22_regexp_syntax.compiler
(c=0xc208c1a988, re=0xc208c2d650)
    at /home/uros/gcc-svn/trunk/libgo/go/regexp/syntax/compile.go:146
#3824 0x00000200008eb444 in regexp_syntax.compile.pN22_regexp_syntax.compiler
(c=0xc208c1a988, re=<optimized out>)
    at /home/uros/gcc-svn/trunk/libgo/go/regexp/syntax/compile.go:156
#3825 0x00000200008eb444 in regexp_syntax.compile.pN22_regexp_syntax.compiler
(c=0xc208c1a988, re=<optimized out>)
    at /home/uros/gcc-svn/trunk/libgo/go/regexp/syntax/compile.go:156
#3826 0x00000200008eb700 in regexp_syntax.Compile (re=0xc208c2d6c0) at
/home/uros/gcc-svn/trunk/libgo/go/regexp/syntax/compile.go:83
#3827 0x0000000120021584 in regexp.compile (expr=..., mode=<optimized out>,
longest=<optimized out>) at regexp.go:161
#3828 0x00000001200213dc in regexp.Compile (expr=...) at regexp.go:118
#3829 0x0000000120021f18 in regexp.MustCompile (str=...) at regexp.go:219
#3830 0x000000012000fa14 in regexp.TestOnePassCutoff (t=<optimized out>) at
all_test.go:478
#3831 0x00000200006a96ac in testing.tRunner (test=0xc20844f288,
param=<optimized out>)
    at /home/uros/gcc-svn/trunk/libgo/go/testing/testing.go:422
#3832 testing.$thunk15 (__go_thunk_parameter=<optimized out>) at
/home/uros/gcc-svn/trunk/libgo/go/testing/testing.go:504
#3833 0x00000200005b774c in kickoff () at
/home/uros/gcc-svn/trunk/libgo/runtime/proc.c:229
#3834 0x0000020000e42264 in ?? () from /lib/libc.so.6.1

There is quite some recursion, maybe this is the reason for a deadlock.