STINNER Victor <vstin...@python.org> added the comment:
More logs on the AArch64 issue.
It seems like *sometimes*, gdb fails to parse debug symbols of
_testcapi.cpython-310d-aarch64-linux-gnu.so, whereas most of the time, "bt"
shows symbols as expected.
stdout+stderr when the bug happens.
#######################################################
Function "meth_fastcall" not defined.
Breakpoint 1 (meth_fastcall) pending.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
1069559: opening
file=/home/vstinner/python/master/build/lib.linux-aarch64-3.10-pydebug/_testcapi.cpython-310d-aarch64-linux-gnu.so
[0]; direct_opencount=1
1069559:
Program received signal SIGTRAP, Trace/breakpoint trap.
?? () from
/home/vstinner/python/master/build/lib.linux-aarch64-3.10-pydebug/_testcapi.cpython-310d-aarch64-linux-gnu.so
#0 ?? () from
/home/vstinner/python/master/build/lib.linux-aarch64-3.10-pydebug/_testcapi.cpython-310d-aarch64-linux-gnu.so
#1 ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
Unable to locate python frame
#######################################################
Extract of a successful run:
#######################################################
Function "meth_fastcall" not defined.
Breakpoint 1 (meth_fastcall) pending.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Breakpoint 1, meth_fastcall (self=<module at remote 0xffffea683e90>, args=,
nargs=0) at /home/vstinner/python/master/Modules/_testcapimodule.c:5255
5255 {
#0 meth_fastcall (self=<module at remote 0xffffea683e90>, args=, nargs=0) at
/home/vstinner/python/master/Modules/_testcapimodule.c:5255
#1 cfunction_vectorcall_FASTCALL (func=<built-in method meth_fastcall of
module object at remote 0xffffea683e90>, args=, nargsf=<optimized out>,
kwnames=<optimized out>) at Objects/methodobject.c:424
#2 _PyObject_VectorcallTstate (tstate=, callable=<built-in method
meth_fastcall of module object at remote 0xffffea683e90>, args=,
nargsf=9223372036854775808, kwnames=0x0) at ./Include/cpython/abstract.h:114
#######################################################
I can reproduce the issue with command "./script.sh" using the following files.
script.sh:
---
$ cat script.sh
OUT=$(mktemp)
while true; do
gdb --batch -x cmds -args ./python -S x.py < /dev/null 2>&1 | tee $OUT
grep -q -F '<built-in method meth_fastcall' $OUT || break
echo
echo "===================================================="
echo
done
echo "#######################################################"
echo "BUG!"
echo "#######################################################"
cat $OUT
echo "#######################################################"
rm -f $OUT
---
x.py:
---
import _testcapi
def foo():
# _testcapi.meth_varargs()
_testcapi.meth_fastcall()
def bar():
foo()
bar()
---
cmds:
---
set breakpoint pending on
add-auto-load-safe-path /home/vstinner/python/master/python-gdb.py
set breakpoint pending yes
set print address off
break meth_fastcall
run
set print entry-values no
bt
py-bt
---
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41473>
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