openssl is configured to be thread safe if libetpan is compiled to be reentrant

[mronge]

No description provided.

[junjie]

I'm using libetpan through MailCore, and have been having an issue where when multiple accounts disconnect at once, I sometimes get the entire thread (one thread per account) locked up.

Here's the stack trace of one such locked thread:

#0 0x397950fc in __psynch_mutexwait ()
#1 0x396dde6a in pthread_mutex_lock ()
#2 0x0052eb4c in locking_function at /UAS8000/MailCore/libetpan/build-mac/../src/data-types/mailstream_ssl.c:163
#3 0x00532db2 in CRYPTO_lock at /UAS8000/MailCore/iOSPorts/ports/security/openssl/openssl/crypto/cryptlib.c:600
#4 0x0059ccd6 in int_thread_get at /UAS8000/MailCore/iOSPorts/ports/security/openssl/openssl/crypto/err/err.c:446
#5 0x0059ce34 in int_thread_get_item at /UAS8000/MailCore/iOSPorts/ports/security/openssl/openssl/crypto/err/err.c:491
#6 0x0059bf7c in ERR_get_state at /UAS8000/MailCore/iOSPorts/ports/security/openssl/openssl/crypto/err/err.c:1014
#7 0x0059c18a in get_error_values at /UAS8000/MailCore/iOSPorts/ports/security/openssl/openssl/crypto/err/err.c:798
#8 0x0059c420 in ERR_peek_error at /UAS8000/MailCore/iOSPorts/ports/security/openssl/openssl/crypto/err/err.c:770
#9 0x00601cea in SSL_get_error at /UAS8000/MailCore/iOSPorts/ports/security/openssl/openssl/ssl/ssl_lib.c:2289
#10 0x0052ec5c in mailstream_low_ssl_read at /UAS8000/MailCore/libetpan/build-mac/../src/data-types/mailstream_ssl.c:765
#11 0x0052cf18 in mailstream_low_read at /UAS8000/MailCore/libetpan/build-mac/../src/data-types/mailstream_low.c:209
#12 0x0052c454 in mailstream_feed_read_buffer at /UAS8000/MailCore/libetpan/build-mac/../src/data-types/mailstream.c:309
#13 0x0052c778 in mailstream_read_line_append at /UAS8000/MailCore/libetpan/build-mac/../src/data-types/mailstream_helper.c:101
#14 0x0052c6e4 in mailstream_read_line at /UAS8000/MailCore/libetpan/build-mac/../src/data-types/mailstream_helper.c:62
#15 0x005006e4 in mailimap_read_line at /UAS8000/MailCore/libetpan/build-mac/../src/low-level/imap/mailimap.c:2396
#16 0x00500dd6 in mailimap_logout at /UAS8000/MailCore/libetpan/build-mac/../src/low-level/imap/mailimap.c:747
#17 0x004f3646 in imapdriver_logout at /UAS8000/MailCore/libetpan/build-mac/../src/driver/implementation/imap/imapdriver.c:326
#18 0x004ff422 in mailsession_logout at /UAS8000/MailCore/libetpan/build-mac/../src/driver/interface/maildriver.c:134
#19 0x0052b7d0 in mailstorage_disconnect at /UAS8000/MailCore/libetpan/build-mac/../src/driver/interface/mailstorage.c:334
#20 0x004e37dc in -[CTCoreAccount disconnect] at /UAS8000/MailCore/Source/CTCoreAccount.m:149

#2 seems to point to the code that's present in this commit. I'm not sure if I'm doing anything wrong here that is causing the locks. Any idea?

[dinhvh]

Could you investigate if the lock has been acquired somewhere else?
(It might be tricky to investigate it)