Disengaging imsgev is tricky. First imsgev_clear as we know there isn't anything left to be written. Signal imsgev termination by setting iev->terminate = 1(Mind that we are setting it from with the callback). As imsgev would again callback dispatch with IMSGEV_DONE, we cannot free imsgev yet. So iev_maildrop need to exist beyond lifetime of session until IMSGEV_DONE. Allocating it seperately from session. imsgev_close is avoided as it schedules another EV_WRITE which is not needed in our case. This fixes a crash observed consistently with a little perl script to simulate concurrent sessions. Thanks MALLOC_OPTIONS='SFG<<'

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#include <openssl/ssl.h>

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/* ssl.c */

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void ssl_init(void);

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void *ssl_setup(void);

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void *pop3s_init(SSL_CTX *, int);

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void ssl_error(const char *);

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/* ssl_privsep.c */

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int ssl_ctx_use_private_key(SSL_CTX *, char *, off_t);

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int ssl_ctx_use_certificate_chain(SSL_CTX *, char *, off_t);