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test_json segfault on OpenBSD #69529
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Sorry I clicked on "create" before adding info in comment. When I run the test_json suite on OpenBSD, I have a segfault: $ egdb ./python
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Reading symbols from ./python...done.
(gdb) set env PYTHONPATH ./Lib
(gdb) set env LD_LIBRARY_PATH .
(gdb) set args ./Lib/test/test_json/
(gdb) r
Starting program: /home/remi/dev/cpython/python ./Lib/test/test_json/
.............................................s......................................................
Program received signal SIGSEGV, Segmentation fault.
0x00001dd119cf9e0d in PyEval_EvalFrameEx (f=<error reading variable: Cannot access memory at address 0x7f7fffbda518>, throwflag=<error reading variable: Cannot access memory at address 0x7f7fffbda514>) at Python/ceval.c:798
(gdb) bt
#0 0x00001dd119cf9e0d in PyEval_EvalFrameEx (f=<error reading variable: Cannot access memory at address 0x7f7fffbda518>, throwflag=<error reading variable: Cannot access memory at address 0x7f7fffbda514>)
at Python/ceval.c:798
#1 0x00001dd119dedbe3 in gen_send_ex (gen=0x1dd35dc11c90, arg=None, exc=0) at Objects/genobject.c:125
#2 0x00001dd119dee6af in _PyGen_Send (gen=0x1dd35dc11c90, arg=None) at Objects/genobject.c:223
#3 0x00001dd119d0267b in PyEval_EvalFrameEx (
f=Frame 0x1dd32e645c38, for file /home/remi/dev/cpython/Lib/json/encoder.py, line 324, in _iterencode_list (lst=[<complex at remote 0x1dd3de8f74f0>], _current_indent_level=0, buf='[', newline_indent=None, separator=', ', first=False, value=<complex at remote 0x1dd3de8f74f0>, chunks=<generator at remote 0x1dd35dc11c90>), throwflag=0) at Python/ceval.c:2038
#4 0x00001dd119dedbe3 in gen_send_ex (gen=0x1dd35dc11c08, arg=None, exc=0) at Objects/genobject.c:125
#5 0x00001dd119dee6af in _PyGen_Send (gen=0x1dd35dc11c08, arg=None) at Objects/genobject.c:223
#6 0x00001dd119d0267b in PyEval_EvalFrameEx (f=Frame 0x1dd39a980c38, for file /home/remi/dev/cpython/Lib/json/encoder.py, line 427, in _iterencode (o=[<complex at remote 0x1dd3de8f74f0>], _current_indent_level=0),
throwflag=0) at Python/ceval.c:2038
#7 0x00001dd119dedbe3 in gen_send_ex (gen=0x1dd35dc11b80, arg=None, exc=0) at Objects/genobject.c:125
#8 0x00001dd119dee6af in _PyGen_Send (gen=0x1dd35dc11b80, arg=None) at Objects/genobject.c:223
#9 0x00001dd119d0267b in PyEval_EvalFrameEx (f=Frame 0x1dd39a980838, for file /home/remi/dev/cpython/Lib/json/encoder.py, line 437, in _iterencode (o=[<complex at remote 0x1dd3de8f74f0>], _current_indent_level=0),
throwflag=0) at Python/ceval.c:2038
#10 0x00001dd119dedbe3 in gen_send_ex (gen=0x1dd35dc11af8, arg=None, exc=0) at Objects/genobject.c:125
#11 0x00001dd119dee6af in _PyGen_Send (gen=0x1dd35dc11af8, arg=None) at Objects/genobject.c:223
#12 0x00001dd119d0267b in PyEval_EvalFrameEx (
f=Frame 0x1dd3b9e32c38, for file /home/remi/dev/cpython/Lib/json/encoder.py, line 324, in _iterencode_list (lst=[<complex at remote 0x1dd3de8f74f0>], _current_indent_level=0, buf='[', newline_indent=None, separator=', ', first=False, value=<complex at remote 0x1dd3de8f74f0>, chunks=<generator at remote 0x1dd35dc11af8>), throwflag=0) at Python/ceval.c:2038
#13 0x00001dd119dedbe3 in gen_send_ex (gen=0x1dd35dc11a70, arg=None, exc=0) at Objects/genobject.c:125
#14 0x00001dd119dee6af in _PyGen_Send (gen=0x1dd35dc11a70, arg=None) at Objects/genobject.c:223
#15 0x00001dd119d0267b in PyEval_EvalFrameEx (f=Frame 0x1dd32e645838, for file /home/remi/dev/cpython/Lib/json/encoder.py, line 427, in _iterencode (o=[<complex at remote 0x1dd3de8f74f0>], _current_indent_level=0),
throwflag=0) at Python/ceval.c:2038
#16 0x00001dd119dedbe3 in gen_send_ex (gen=0x1dd35dc119e8, arg=None, exc=0) at Objects/genobject.c:125
#17 0x00001dd119dee6af in _PyGen_Send (gen=0x1dd35dc119e8, arg=None) at Objects/genobject.c:223
#18 0x00001dd119d0267b in PyEval_EvalFrameEx (f=Frame 0x1dd39a980438, for file /home/remi/dev/cpython/Lib/json/encoder.py, line 437, in _iterencode (o=[<complex at remote 0x1dd3de8f74f0>], _current_indent_level=0),
throwflag=0) at Python/ceval.c:2038
#19 0x00001dd119dedbe3 in gen_send_ex (gen=0x1dd35dc11960, arg=None, exc=0) at Objects/genobject.c:125
#20 0x00001dd119dee6af in _PyGen_Send (gen=0x1dd35dc11960, arg=None) at Objects/genobject.c:223
#21 0x00001dd119d0267b in PyEval_EvalFrameEx (
f=Frame 0x1dd3b9e32838, for file /home/remi/dev/cpython/Lib/json/encoder.py, line 324, in _iterencode_list (lst=[<complex at remote 0x1dd3de8f74f0>], _current_indent_level=0, buf='[', newline_indent=None, separator=', ', first=False, value=<complex at remote 0x1dd3de8f74f0>, chunks=<generator at remote 0x1dd35dc11960>), throwflag=0) at Python/ceval.c:2038
#22 0x00001dd119dedbe3 in gen_send_ex (gen=0x1dd35dc118d8, arg=None, exc=0) at Objects/genobject.c:125
#23 0x00001dd119dee6af in _PyGen_Send (gen=0x1dd35dc118d8, arg=None) at Objects/genobject.c:223
#24 0x00001dd119d0267b in PyEval_EvalFrameEx (f=Frame 0x1dd3b9e32038, for file /home/remi/dev/cpython/Lib/json/encoder.py, line 427, in _iterencode (o=[<complex at remote 0x1dd3de8f74f0>], _current_indent_level=0),
throwflag=0) at Python/ceval.c:2038
#25 0x00001dd119dedbe3 in gen_send_ex (gen=0x1dd35dc11850, arg=None, exc=0) at Objects/genobject.c:125
#26 0x00001dd119dee6af in _PyGen_Send (gen=0x1dd35dc11850, arg=None) at Objects/genobject.c:223
#27 0x00001dd119d0267b in PyEval_EvalFrameEx (f=Frame 0x1dd3a36ba438, for file /home/remi/dev/cpython/Lib/json/encoder.py, line 437, in _iterencode (o=[<complex at remote 0x1dd3de8f74f0>], _current_indent_level=0),
throwflag=0) at Python/ceval.c:2038
#28 0x00001dd119dedbe3 in gen_send_ex (gen=0x1dd35dc117c8, arg=None, exc=0) at Objects/genobject.c:125
#29 0x00001dd119dee6af in _PyGen_Send (gen=0x1dd35dc117c8, arg=None) at Objects/genobject.c:223
#30 0x00001dd119d0267b in PyEval_EvalFrameEx (
f=Frame 0x1dd32e645438, for file /home/remi/dev/cpython/Lib/json/encoder.py, line 324, in _iterencode_list (lst=[<complex at remote 0x1dd3de8f74f0>], _current_indent_level=0, buf='[', newline_indent=None, separator=', ', first=False, value=<complex at remote 0x1dd3de8f74f0>, chunks=<generator at remote 0x1dd35dc117c8>), throwflag=0) at Python/ceval.c:2038
#31 0x00001dd119dedbe3 in gen_send_ex (gen=0x1dd35dc11740, arg=None, exc=0) at Objects/genobject.c:125
#32 0x00001dd119dee6af in _PyGen_Send (gen=0x1dd35dc11740, arg=None) at Objects/genobject.c:223
#33 0x00001dd119d0267b in PyEval_EvalFrameEx (f=Frame 0x1dd3b9e32438, for file /home/remi/dev/cpython/Lib/json/encoder.py, line 427, in _iterencode (o=[<complex at remote 0x1dd3de8f74f0>], _current_indent_level=0),
throwflag=0) at Python/ceval.c:2038
#34 0x00001dd119dedbe3 in gen_send_ex (gen=0x1dd35dc116b8, arg=None, exc=0) at Objects/genobject.c:125
#35 0x00001dd119dee6af in _PyGen_Send (gen=0x1dd35dc116b8, arg=None) at Objects/genobject.c:223
#36 0x00001dd119d0267b in PyEval_EvalFrameEx (f=Frame 0x1dd3a36ba038, for file /home/remi/dev/cpython/Lib/json/encoder.py, line 437, in _iterencode (o=[<complex at remote 0x1dd3de8f74f0>], _current_indent_level=0),
throwflag=0) at Python/ceval.c:2038
#37 0x00001dd119dedbe3 in gen_send_ex (gen=0x1dd35dc11630, arg=None, exc=0) at Objects/genobject.c:125
#38 0x00001dd119dee6af in _PyGen_Send (gen=0x1dd35dc11630, arg=None) at Objects/genobject.c:223 |
It fails on test_endless_recursion: $ LD_LIBRARY_PATH=. PYTHONPATH=./Lib/ ./python ./Lib/test/test_json -v test_endless_recursion (test.test_json.test_recursion.TestPyRecursion) ... zsh: segmentation fault (core dumped) |
Try setting the stack size to 8MB (the default on Linux) in login.conf. |
It's good when I entered "ulimit -s 8192". Sorry for the noise... |
It's not noise, we also have problems on Windows with test_json. In theory we should set Py_DEFAULT_RECURSION_LIMIT in Python/ceval.c For OpenBSD it's clearly too high for the default. Could you try |
Would it be possible to compute the recursion limit depending on the current maximum C stack size? At least estimate it? I guess the sys.getdefaultlimit() is 1000 is an arbitrary value. I also know that the effective limit depends on the memory allocated on the stack by C functions. Calling a Python function and a function implemented in C is different :-/ |
The ratio (1000/8MB) seems to be stable on Linux. Perhaps we could It's just an estimate of course. |
Or did you want to compute it at runtime? Actually, why not? |
Stefan Krah added the comment:
I'm asking to adjust the limit at _runtime_. getrlimit() is not |
Adjusting the estimate at runtime sounds good to me. |
Closing as OpenBSD is not supported as per PEP 11. |
Lib/test/test_json/test_recursion.py now uses |
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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