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There is definitely a local problem with this code; _dispatch_muxnote_create can return NULL under certain odd circumstances and dispatch_unote_register is blindly dereferencing the result of calling _dispatch_muxnote_create when it is NULL, causing a segfault. Putting in the obvious check for NULL and returning false from dispatch_unote_register appears to be sufficient to allow the FTP tests to pass. I'm preparing a dispatch PR with the fix.--
It is still possible there is a higher-level bug in the layers above here, but the lowlevel code is definitely missing a check for a NULL return that can (does) happen.
Additional Detail from JIRA
md5: 449ba526e5ae862c14b254de13d2ee31
Issue Description:
This time its a dispatch crash. Very intermittent. All I could retrieve from the crash is the backtrace:
If I have other findings, I'll post them here.
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