New issue 1965: Greenlets on OSX Yosemite segfault
https://bitbucket.org/pypy/pypy/issue/1965/greenlets-on-osx-yosemite-segfault
Mike Kaplinskiy:
Looks like it's heap corruption. Something as simple as:
```
#!python
from greenlet import greenlet, getcurrent
def switch_back():
getcurrent().parent.switch()
i = 0
while True:
greenlet(switch_back).switch()
if i % 100 == 0:
print i
i += 1
```
GDB says the crash happens at malloc, which seems to be heap corruption.
```
#0 0x00007fff8526cffa in szone_malloc_should_clear () from
/usr/lib/system/libsystem_malloc.dylib
#1 0x00007fff8526c877 in malloc_zone_malloc () from
/usr/lib/system/libsystem_malloc.dylib
#2 0x00007fff8526b395 in malloc () from /usr/lib/system/libsystem_malloc.dylib
#3 0x00000001010d7555 in g_save_state () from
/Users/mkaplinskiy/pypy-hg/libpypy-c.dylib
#4 0x00000001010d746e in slp_switch () from
/Users/mkaplinskiy/pypy-hg/libpypy-c.dylib
#5 0x0000000100000000 in ?? ()
#6 0x00000001054131c0 in ?? ()
#7 0x00000000ffffffff in ?? ()
#8 0x000000010495bd30 in ?? ()
#9 0x0000000103f41570 in ?? ()
#10 0x0000000100204970 in pypy_g_BuiltinActivation_UwS_W_Continulet__run ()
from /Users/mkaplinskiy/pypy-hg/libpypy-c.dylib
#11 0x00000001010d7518 in stacklet_switch () from
/Users/mkaplinskiy/pypy-hg/libpypy-c.dylib
...
```
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