Date: Wed, 23 Jan 2019 06:22:35 +0100 From: Markus Wichmann <nullplan@....net> To: musl@...ts.openwall.com Subject: Re: Possibly spurious EAGAIN seen in pthread_key_create on x86 On Tue, Jan 22, 2019 at 03:15:35PM -0600, A. Wilcox wrote: > Hello there muslers, > > While running the test suite for GLib++ (the C++ wrapper for GLib) on > our 32-bit x86 builder (i686), after upgrading to 1.1.21, it logged: > > > FAIL: glibmm_mainloop/test > ========================== > GLib (gthread-posix.c): Unexpected error from C library during > 'pthread_key_create': Resource temporarily unavailable. Aborting. > > > Running the test suite an additional 160 (one hundred and sixty) times > could not repeat the result. Still, I wanted to report it on the > off-chance there is some significance to this single result. > > Importantly, I haven't noticed this failure on any of the other > architectures we've built GLib++ on (ppc32, ppc64, aarch64). > > Best, > --arw > > -- > A. Wilcox (awilfox) > Project Lead, Adélie Linux > https://www.adelielinux.org > That error message is the message for EAGAIN. pthread_key_create() returns EAGAIN if found_dirty == 0 or clean_dirty_tsd() failed. The former would mean that the test suite tried to create more than PTHREAD_KEYS_MAX keys, but since that value is static, barring a weird usage pattern, you'd get the error always. So it's going to be the latter. clean_dirty_tsd() does a synccall. It will return an error if the calling thread is unable to signal itself enough to run the callback. Or, if somehow the value of __pthread_self() changed between the start of clean_dirty_tsd() and the end of clean_dirty_tsd_callback(), but that is space fairy territory, isn't it? No, the only way I see to get through __synccall() without calling the callback at least in the calling thread, is to go to the label "out:", which only happens if /proc/self/task could not be opened. So I guess you ran afoul of a temporary failure in open(), then. Ciao, Markus
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