On Mon, Feb 15, 2016 at 06:33:42PM +0100, Andres Freund wrote: > On 2016-02-15 12:11:29 -0500, Noah Misch wrote: > > These suggested OidGenLock wasn't doing its job. I've seen similar symptoms > > around WALInsertLocks with "IBM XL C/C++ for Linux, V13.1.2 (5725-C73, > > 5765-J08)" for ppc64le. The problem is generic-xlc.h > > pg_atomic_compare_exchange_u32_impl() issuing __isync() before > > __compare_and_swap(). __isync() shall follow __compare_and_swap(); see our > > own s_lock.h, its references, and other projects' usage: > > Ugh. You're right! It's about not moving code before the stwcx... > > Do you want to add the new test (no objection, curious), or is that more > for testing?
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