#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007fd72120542a in __GI_abort () at abort.c:89
#2  0x00007fd7211fce67 in __assert_fail_base (fmt=<optimized out>, assertion=assertion@entry=0x7fd7220d1e60 "INTERNAL_SYSCALL_ERRNO (e, __err) != ESRCH || !robust",
    file=file@entry=0x7fd7220d1da5 "../nptl/pthread_mutex_lock.c", line=line@entry=352,
    function=function@entry=0x7fd7220d1f10 <__PRETTY_FUNCTION__.8646> "__pthread_mutex_lock_full") at assert.c:92
#3  0x00007fd7211fcf12 in __GI___assert_fail (assertion=assertion@entry=0x7fd7220d1e60 "INTERNAL_SYSCALL_ERRNO (e, __err) != ESRCH || !robust",
    file=file@entry=0x7fd7220d1da5 "../nptl/pthread_mutex_lock.c", line=line@entry=352,
    function=function@entry=0x7fd7220d1f10 <__PRETTY_FUNCTION__.8646> "__pthread_mutex_lock_full") at assert.c:101
#4  0x00007fd7220c89dd in __pthread_mutex_lock_full (mutex=0x559ad195f138) at ../nptl/pthread_mutex_lock.c:352
#5  0x00007fd71afdffd9 in gpr_mu_lock (mu=<optimized out>) at src/core/lib/gpr/sync_posix.cc:47
#6  0x00007fd71afe18f8 in grpc_core::internal::ExecCtxState::IncExecCtxCount (this=<optimized out>) at src/core/lib/gprpp/fork.cc:64
#7  grpc_core::Fork::IncExecCtxCount () at src/core/lib/gprpp/fork.cc:215
#8  0x00007fd71affc65f in grpc_core::ExecCtx::ExecCtx (this=0x7ffee8b070f0) at ./src/core/lib/iomgr/exec_ctx.h:93
#9  grpc_prefork () at src/core/lib/iomgr/fork_posix.cc:50
#10 0x00007fd721289335 in __libc_fork () at ../sysdeps/nptl/fork.c:96
#11 0x0000559acd7f428e in subprocess_fork_exec () at ../Modules/_posixsubprocess.c:673
#12 0x0000559acd77d6df in PyCFunction_Call () at ../Objects/methodobject.c:109
#13 0x0000559acd74011c in call_function (oparg=<optimized out>, pp_stack=0x7ffee8b074e0) at ../Python/ceval.c:4720
#14 PyEval_EvalFrameEx () at ../Python/ceval.c:3251
#15 0x0000559acd7427bf in _PyEval_EvalCodeWithName () at ../Python/ceval.c:4033
#16 0x0000559acd73e4c9 in fast_function (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7ffee8b076f0, func=<optimized out>)
    at ../Python/ceval.c:4828
#17 call_function (oparg=<optimized out>, pp_stack=0x7ffee8b076f0) at ../Python/ceval.c:4745
#18 PyEval_EvalFrameEx () at ../Python/ceval.c:3251
#19 0x0000559acd7430df in _PyEval_EvalCodeWithName (qualname=0x0, name=<optimized out>, closure=0x0, kwdefs=0x0, defcount=16, defs=0x7fd7206ed110, kwcount=1,
    kws=<optimized out>, argcount=<optimized out>, args=<optimized out>, locals=<optimized out>, globals=<optimized out>, _co=<optimized out>) at ../Python/ceval.c:4033
#20 PyEval_EvalCodeEx () at ../Python/ceval.c:4054
#21 0x0000559acd77f7bf in function_call.lto_priv () at ../Objects/funcobject.c:627
#22 0x0000559acd7c6647 in PyObject_Call () at ../Objects/abstract.c:2166
#23 0x0000559acd6e694e in method_call.lto_priv () at ../Objects/classobject.c:330
#24 0x0000559acd7c6647 in PyObject_Call () at ../Objects/abstract.c:2166
#25 0x0000559acd786aa9 in slot_tp_init () at ../Objects/typeobject.c:6287
#26 0x0000559acd78e5c4 in type_call.lto_priv () at ../Objects/typeobject.c:905
#27 0x0000559acd7c6647 in PyObject_Call () at ../Objects/abstract.c:2166
#28 0x0000559acd73b180 in ext_do_call (nk=<optimized out>, na=<optimized out>, flags=<optimized out>, pp_stack=0x7ffee8b07ac8, func=<type at remote 0x559acfda6e98>)
    at ../Python/ceval.c:5049
#29 PyEval_EvalFrameEx () at ../Python/ceval.c:3290
#30 0x0000559acd743817 in _PyEval_EvalCodeWithName (qualname=0x0, name=<optimized out>, closure=0x0, kwdefs={'input': None, 'check': False, 'timeout': None},
    defcount=0, defs=0x0, kwcount=3, kws=<optimized out>, argcount=<optimized out>, args=<optimized out>, locals=<optimized out>, globals=<optimized out>,
    _co=<optimized out>) at ../Python/ceval.c:4033
#31 PyEval_EvalCodeEx () at ../Python/ceval.c:4054
#32 0x0000559acd77f7bf in function_call.lto_priv () at ../Objects/funcobject.c:627
#33 0x0000559acd7c6647 in PyObject_Call () at ../Objects/abstract.c:2166
#34 0x0000559acd73b180 in ext_do_call (nk=<optimized out>, na=<optimized out>, flags=<optimized out>, pp_stack=0x7ffee8b07d78, func=<function at remote 0x7fd7206fa6a8>)