[Libevent-users] libevent-2.0.8-rc/evdns.c:2672: Assertion (req)->handle && (req)->handle->current_req == (req) failed in evdns_cancel_request

[Denis Bilenko <denis.bilenko@xxxxxxxxx>]

I've been working on making gevent use libevent's getaddrinfo and
occasionally get the above message in one of the test cases. What
could trigger it? How can I avoid it?

I don't call evdns_getaddrinfo_cancel if the callback was already
executed, so I wonder how could I arrive at invalid request?

libevent version: 2.0.8-rc

A bit more context:

#0  0x002cc422 in __kernel_vsyscall ()
No symbol table info available.
#1  0x0013a651 in raise () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#2  0x0013da82 in abort () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#3  0x00329385 in event_exit (errcode=-559030611) at
/home/denis/src/libevent-all/libevent-2.0.8-rc/log.c:79
No locals.
#4  0x003293b7 in event_errx (eval=-559030611, fmt=0x3402f4 "%s:%d:
Assertion %s failed in %s") at
/home/denis/src/libevent-all/libevent-2.0.8-rc/log.c:136
No locals.
#5  0x00334468 in evdns_cancel_request (base=0x8cac928,
handle=0x8cb9530) at
/home/denis/src/libevent-all/libevent-2.0.8-rc/evdns.c:2672
        req = 0x267410
        __func__ = "evdns_cancel_request"
#6  0x003344a6 in evdns_getaddrinfo_cancel (data=0x8d0e588) at
/home/denis/src/libevent-all/libevent-2.0.8-rc/evdns.c:4465
No locals.
#7  0x002e7773 in __pyx_pf_6gevent_4core_19getaddrinfo_request__cancel
(__pyx_v_self=<gevent.core.getaddrinfo_request at remote 0x8c74aec>,
unused=0x0)
    at gevent/core.c:5227
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