New issue 2098: Segfault in pypy_g_IncrementalMiniMarkGC_visit
https://bitbucket.org/pypy/pypy/issues/2098/segfault-in
Patrick Varley:
# Environment #
* OS: OS X 10.10.4 (14E46)
* Python: 2.7.9 (295ee98b69288471b0fcf2e0ede82ce5209eb90b, Jun 02 2015,
18:26:45)
* Pypy: PyPy 2.6.0 with GCC 4.2.1 Compatible Apple LLVM 6.1.0 (clang-602.0.53)
Pypy was installed from homebrew.
# Problem #
I have a script that run successfully with Pypy 2.5.1, when I upgrade to Pypy
2.6.0, it sometimes produces a segfaults.
Here is the backtrace from the core dump:
```
(lldb) target create "/usr/local/bin/pypy" --core "/cores/core.59563"
warning: (x86_64) /cores/core.59563 load command 295 LC_SEGMENT_64 has a
fileoff + filesize (0x2af9a000) that extends beyond the end of the file
(0x2af99000), the segment will be truncated to match
warning: (x86_64) /cores/core.59563 load command 296 LC_SEGMENT_64 has a
fileoff (0x2af9a000) that extends beyond the end of the file (0x2af99000),
ignoring this section
Core file '/cores/core.59563' (x86_64) was loaded.
Process 0 stopped
* thread #1: tid = 0x0000, 0x0000000100eb47be
libpypy-c.dylib`pypy_g_IncrementalMiniMarkGC_visit + 59, stop reason = signal
SIGSTOP
frame #0: 0x0000000100eb47be
libpypy-c.dylib`pypy_g_IncrementalMiniMarkGC_visit + 59
libpypy-c.dylib`pypy_g_IncrementalMiniMarkGC_visit:
-> 0x100eb47be <+59>: testb $0x1, 0x3(%rax,%rcx)
0x100eb47c3 <+64>: je 0x100eb47fe ; <+123>
0x100eb47c5 <+66>: movq %r14, %rdi
0x100eb47c8 <+69>: movq %rbx, %rsi
(lldb) bt all
* thread #1: tid = 0x0000, 0x0000000100eb47be
libpypy-c.dylib`pypy_g_IncrementalMiniMarkGC_visit + 59, stop reason = signal
SIGSTOP
* frame #0: 0x0000000100eb47be
libpypy-c.dylib`pypy_g_IncrementalMiniMarkGC_visit + 59
frame #1: 0x0000000100eb2869
libpypy-c.dylib`pypy_g_IncrementalMiniMarkGC_visit_all_objects_step + 79
frame #2: 0x0000000100eb19ab
libpypy-c.dylib`pypy_g_IncrementalMiniMarkGC_major_collection_step + 456
frame #3: 0x0000000100eb0354
libpypy-c.dylib`pypy_g_IncrementalMiniMarkGC_collect_and_reserve + 290
frame #4: 0x0000000100eb3b9d
libpypy-c.dylib`pypy_g_IncrementalMiniMarkGC_malloc_fixedsize + 228
frame #5: 0x0000000105100c1d
```
Unfortunately I will not be able to provide the core dump or the script as it
contains sensitive information. I'm happy to run any lldb command that is
required to debug this further.
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