Christian Heimes added the comment:

#0  memchr () at ../sysdeps/x86_64/memchr.S:155
#1  0x0000000000467ca4 in countchar (maxcount=<optimized out>, c=10 '\n', 
target_len=-1152922353, target=0x7fff3b196034 'A' <repeats 200 times>...)
    at Objects/stringobject.c:2341
#2  replace_delete_single_character (maxcount=<optimized out>, from_c=10 '\n', 
self=0x7fff3b196010) at Objects/stringobject.c:2427
#3  replace (maxcount=<optimized out>, to_len=<optimized out>, to_s=<optimized 
out>, from_len=1, from_s=<optimized out>, self=0x7fff3b196010)
    at Objects/stringobject.c:2780
#4  string_replace (self=0x7fff3b196010, args=<optimized out>) at 
Objects/stringobject.c:2854

target_len=-1152922353 looks fishy. I think countchar()'s target_len argument 
has a wrong argument type. It should be Py_ssize_t instead of int.

-countchar(const char *target, int target_len, char c, Py_ssize_t maxcount)
+countchar(const char *target, Py_ssize_t target_len, char c, Py_ssize_t 
maxcount)

----------
nosy: +christian.heimes

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18427>
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