Backtrace with Debug Symbols:

Thread 1 (Thread 0x7ffff7e3d200 (LWP 6466) "python3"):
#0  __pthread_kill_implementation (threadid=<optimized out>, signo=6, no_tid=0) 
at ./nptl/pthread_kill.c:44
        tid = <optimized out>
        ret = 0
        pd = <optimized out>
        old_mask = {__val = {140737488346176}}
        ret = <optimized out>
#1  __pthread_kill_internal (threadid=<optimized out>, signo=6) at 
./nptl/pthread_kill.c:89
No locals.
#2  __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at 
./nptl/pthread_kill.c:100
No locals.
#3  0x00007ffff7c45b7e in __GI_raise (sig=sig@entry=6) at 
../sysdeps/posix/raise.c:26
        ret = <optimized out>
#4  0x00007ffff7c288ec in __GI_abort () at ./stdlib/abort.c:77
        act = {__sigaction_handler = {sa_handler = 0xd54c00, sa_sigaction = 
0xd54c00}, sa_mask = {__val = {0, 140737488346272, 140737350673833, 509, 
140737329655552, 140737488346304, 5327923, 140737488346288, 12196512, 
140737488346376, 140737344763760, 140737488346392, 140737343847104, 
140737345661472, 140737488346488, 140737488346424}}, sa_flags = -144508224, 
sa_restorer = 0x0}
#5  0x00007ffff7c29979 in __libc_message_impl 
(vma_name=vma_name@entry=0x7ffff7ddb569 "glibc: fatal", 
fmt=fmt@entry=0x7ffff7ddeba5 "%s\n") at ../sysdeps/posix/libc_fatal.c:138
        ap = {{gp_offset = 24, fp_offset = 0, overflow_arg_area = 
0x7fffffffdec0, reg_save_area = 0x7fffffffde50}}
        fd = 2
        iov = {{iov_base = 0x7ffff7ddcac7, iov_len = 23}, {iov_base = 
0x7ffff7ddeba7, iov_len = 1}, {iov_base = 0x1, iov_len = 0}, {iov_base = 
0x7ffff76308c1, iov_len = 11684000}, {iov_base = 0x7ffff77ea0c0, iov_len = 1}, 
{iov_base = 0xb248a0 <_PyRuntime+315680>, iov_len = 11684000}, {iov_base = 
0x1fd, iov_len = 0}, {iov_base = 0x7fffffffde00, iov_len = 5327923}, {iov_base 
= 0x7fffffffde20, iov_len = 5429197}, {iov_base = 0xb, iov_len = 141}, 
{iov_base = 0x7fffffffde30, iov_len = 3953829685547924992}, {iov_base = 
0xb248a0 <_PyRuntime+315680>, iov_len = 0}, {iov_base = 0xd936d0, iov_len = 
14235232}, {iov_base = 0x0, iov_len = 140737329927856}, {iov_base = 
0x7fffffffde70, iov_len = 140737350673833}}
        iovcnt = <optimized out>
        total = <optimized out>
        cp = <optimized out>
#6  0x00007ffff7cb0b2c in __libc_message_wrapper (vmaname=0x7ffff7ddb569 
"glibc: fatal", fmt=0x7ffff7ddeba5 "%s\n") at ../include/stdio.h:203
No locals.
#7  malloc_printerr (str=<optimized out>) at ./malloc/malloc.c:5341
No locals.
#8  0x00007ffff7cb0b44 in malloc_printerr_tail (str=<optimized out>) at 
./malloc/malloc.c:5358
No locals.
#9  0x00007ffff6d47e6c in pybind11::cpp_function::destruct (rec=0xd940e0, 
free_strings=true) at /usr/include/pybind11/pybind11.h:769
        arg = @0xd94290: {name = 0x7ffff72523e7 "self", descr = 0x0, value = 
{<pybind11::detail::object_api<pybind11::handle>> = 
{<pybind11::detail::pyobject_tag> = {<No data fields>}, <No data fields>}, 
m_ptr = 0x0}, convert = true, none = false}
        __for_range = std::vector of length 1, capacity 1 = {{name = 
0x7ffff72523e7 "self", descr = 0x0, value = 
{<pybind11::detail::object_api<pybind11::handle>> = 
{<pybind11::detail::pyobject_tag> = {<No data fields>}, <No data fields>}, 
m_ptr = 0x0}, convert = true, none = false}}
        __for_begin = <optimized out>
        __for_end = <optimized out>
        next = 0x0
#10 pybind11::detail::function_record_PyTypeObject_methods::tp_dealloc_impl 
(self=0x7ffff68e97d0) at /usr/include/pybind11/pybind11.h:1250
        py_func_rec = 0x7ffff68e97d0
#11 0x0000000000514c33 in _Py_Dealloc ()
No symbol table info available.
#12 0x0000000000537d59 in ?? ()
No symbol table info available.
#13 0x0000000000514c33 in _Py_Dealloc ()
No symbol table info available.
#14 0x0000000000691dc3 in ?? ()
No symbol table info available.
#15 0x00000000006202b8 in ?? ()
No symbol table info available.
#16 0x000000000056033e in ?? ()
No symbol table info available.
#17 0x00000000006ade3c in ?? ()
No symbol table info available.
#18 0x00000000006c25c0 in Py_RunMain ()
No symbol table info available.
#19 0x0000000000670ef4 in Py_BytesMain ()
No symbol table info available.
#20 0x00007ffff7c2a601 in __libc_start_call_main (main=main@entry=0x670eb0, 
argc=argc@entry=3, argv=argv@entry=0x7fffffffe5a8) at 
../sysdeps/nptl/libc_start_call_main.h:59
        self = <optimized out>
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 7212237016248971131, 
140737488348584, 3, 140737354125312, 11050448, 7212237016261554043, 
7212254357161209723}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x67049b, 
0xa89dc8}, data = {prev = 0x0, cleanup = 0x0, canceltype = 6751387}}}
        not_first_call = <optimized out>
#21 0x00007ffff7c2a718 in __libc_start_main_impl (main=0x670eb0, argc=3, 
argv=0x7fffffffe5a8, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>, stack_end=0x7fffffffe598) at ../csu/libc-start.c:360
No locals.
#22 0x00000000006702e5 in _start ()
No symbol table info available.

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https://bugs.launchpad.net/bugs/2163679

Title:
  autopkgtest failure: free() invalid pointer

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