Closed
Description
Crash report
What happened?
There are two ways to get aborts starting from fcntl.ioctl: one happens in _PyEval_EvalFrameDefault, the other results in a Fatal Python error. Not sure this is a single issue, so reporting both ways.
Here's a MRE for the first abort:
from pathlib._os import _ficlone
try:
_ficlone(None, None)
except:
_ficlone("A" * 2048, True)It results in this backtrace:
/home/danzin/projects/main_gilful_debug/Lib/pathlib/_os.py:50: RuntimeWarning: bool is used as a file descriptor
fcntl.ioctl(target_fd, fcntl.FICLONE, source_fd)
python: Python/generated_cases.c.h:2269: _PyEval_EvalFrameDefault: Assertion `(res_o != NULL) ^ (_PyErr_Occurred(tstate) != NULL)' failed.
Program received signal SIGABRT, Aborted.
#0 __pthread_kill_implementation (no_tid=0, signo=6, threadid=140737340064384) at ./nptl/pthread_kill.c:44
#1 __pthread_kill_internal (signo=6, threadid=140737340064384) at ./nptl/pthread_kill.c:78
#2 __GI___pthread_kill (threadid=140737340064384, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#3 0x00007ffff72f7476 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#4 0x00007ffff72dd7f3 in __GI_abort () at ./stdlib/abort.c:79
#5 0x00007ffff72dd71b in __assert_fail_base (fmt=0x7ffff7492130 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n",
assertion=0x5555561ea6e0 "(res_o != NULL) ^ (_PyErr_Occurred(tstate) != NULL)", file=0x5555561e9c80 "Python/generated_cases.c.h", line=2269,
function=<optimized out>) at ./assert/assert.c:94
#6 0x00007ffff72eee96 in __GI___assert_fail (assertion=assertion@entry=0x5555561ea6e0 "(res_o != NULL) ^ (_PyErr_Occurred(tstate) != NULL)",
file=file@entry=0x5555561e9c80 "Python/generated_cases.c.h", line=line@entry=2269,
function=function@entry=0x5555561eeee0 <__PRETTY_FUNCTION__.84> "_PyEval_EvalFrameDefault") at ./assert/assert.c:103
#7 0x0000555555d3e31d in _PyEval_EvalFrameDefault (tstate=tstate@entry=0x555556681960 <_PyRuntime+331232>, frame=0x629000005298,
frame@entry=0x629000005220, throwflag=throwflag@entry=0) at Python/generated_cases.c.h:2269
#8 0x0000555555d926ac in _PyEval_EvalFrame (throwflag=0, frame=0x629000005220, tstate=0x555556681960 <_PyRuntime+331232>)
at ./Include/internal/pycore_ceval.h:119
#9 _PyEval_Vector (tstate=tstate@entry=0x555556681960 <_PyRuntime+331232>, func=func@entry=0x610000040560, locals=locals@entry=0x60800009e5c0,
args=args@entry=0x0, argcount=argcount@entry=0, kwnames=kwnames@entry=0x0) at Python/ceval.c:1961
#10 0x0000555555d929b0 in PyEval_EvalCode (co=co@entry=0x614000036a50, globals=globals@entry=0x60800009e5c0, locals=locals@entry=0x60800009e5c0)
at Python/ceval.c:853
Here's a MRE for the second abort:
import fcntl
try:
fcntl.ioctl(None, fcntl.FICLONE, None)
except:
pass
fcntl.ioctl(True, fcntl.FICLONE,"A" * 2048)It results in this backtrace:
/mnt/c/Users/ddini/crashers/main/pathlib__os-cpu_load-assertion/source2.py:13: RuntimeWarning: bool is used as a file descriptor
fcntl.ioctl(True, fcntl.FICLONE,"A" * 2048)
Fatal Python error: _Py_CheckFunctionResult: a function returned NULL without setting an exception
Python runtime state: initialized
SystemError: <built-in function ioctl> returned NULL without setting an exception
Current thread 0x00007ffff7294280 [python] (most recent call first):
File "/mnt/c/Users/ddini/crashers/main/pathlib__os-cpu_load-assertion/source2.py", line 13 in <module>
Program received signal SIGABRT, Aborted.
#0 __pthread_kill_implementation (no_tid=0, signo=6, threadid=140737340064384) at ./nptl/pthread_kill.c:44
#1 __pthread_kill_internal (signo=6, threadid=140737340064384) at ./nptl/pthread_kill.c:78
#2 __GI___pthread_kill (threadid=140737340064384, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#3 0x00007ffff72f7476 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#4 0x00007ffff72dd7f3 in __GI_abort () at ./stdlib/abort.c:79
#5 0x0000555555ea92d7 in fatal_error_exit (status=<optimized out>) at Python/pylifecycle.c:3150
#6 0x0000555555ebfc0e in fatal_error (fd=fd@entry=2, header=header@entry=1,
prefix=prefix@entry=0x5555560fdc60 <__func__.23> "_Py_CheckFunctionResult",
msg=msg@entry=0x5555560fc9c0 "a function returned NULL without setting an exception", status=status@entry=-1) at Python/pylifecycle.c:3366
#7 0x0000555555ebfcc5 in _Py_FatalErrorFunc (func=func@entry=0x5555560fdc60 <__func__.23> "_Py_CheckFunctionResult",
msg=msg@entry=0x5555560fc9c0 "a function returned NULL without setting an exception") at Python/pylifecycle.c:3382
#8 0x000055555598ceaf in _Py_CheckFunctionResult (tstate=tstate@entry=0x555556681960 <_PyRuntime+331232>, callable=callable@entry=0x6080000cbac0,
result=<optimized out>, where=where@entry=0x0) at Objects/call.c:43
#9 0x000055555598ddf5 in _PyObject_VectorcallTstate (tstate=0x555556681960 <_PyRuntime+331232>, callable=0x6080000cbac0, args=0x7fffffffcdc8,
nargsf=9223372036854775811, kwnames=0x0) at ./Include/internal/pycore_call.h:170
#10 0x000055555598df3c in PyObject_Vectorcall (callable=callable@entry=0x6080000cbac0, args=args@entry=0x7fffffffcdc8, nargsf=<optimized out>,
kwnames=kwnames@entry=0x0) at Objects/call.c:327
#11 0x0000555555d38dbe in _PyEval_EvalFrameDefault (tstate=tstate@entry=0x555556681960 <_PyRuntime+331232>, frame=frame@entry=0x629000005220,
throwflag=throwflag@entry=0) at Python/generated_cases.c.h:1619
#12 0x0000555555d926ac in _PyEval_EvalFrame (throwflag=0, frame=0x629000005220, tstate=0x555556681960 <_PyRuntime+331232>)
at ./Include/internal/pycore_ceval.h:119
#13 _PyEval_Vector (tstate=tstate@entry=0x555556681960 <_PyRuntime+331232>, func=func@entry=0x610000040560, locals=locals@entry=0x60800009e5c0,
args=args@entry=0x0, argcount=argcount@entry=0, kwnames=kwnames@entry=0x0) at Python/ceval.c:1961
#14 0x0000555555d929b0 in PyEval_EvalCode (co=co@entry=0x613000026150, globals=globals@entry=0x60800009e5c0, locals=locals@entry=0x60800009e5c0)
at Python/ceval.c:853
#15 0x0000555555ecdfc1 in run_eval_code_obj (tstate=tstate@entry=0x555556681960 <_PyRuntime+331232>, co=co@entry=0x613000026150,
globals=globals@entry=0x60800009e5c0, locals=locals@entry=0x60800009e5c0) at Python/pythonrun.c:1365
Found using fusil by @vstinner.
CPython versions tested on:
CPython main branch
Operating systems tested on:
Linux
Output from running 'python -VV' on the command line:
Python 3.15.0a0 (heads/main:56743afe879, May 26 2025, 15:23:40) [GCC 11.4.0]