On Thu, Jan 31, 2019 at 06:06:53PM +0100, Sebastian Sewior wrote: > On 2019-01-31 17:52:28 [+0100], Heiko Carstens wrote: > > ...nevertheless Stefan and I looked through the lovely disassembly of > > _pthread_mutex_lock_full() to verify if the compiler barriers are > > actually doing what they are supposed to do. The generated code > > however does look correct. > > So, it must be something different. > > would it make sense to use one locking function instead all three (lock, > try-lock, timed) in the test case to figure out if this is related to > one of the locking function? I tried all three variants, but it seems to be close to impossible to re-create then. I had a single fail when using only the trylock variant, but I wouldn't say that means anything. Only if all three variants run in parallel it seems to be quite reliably reproducible, even though sometimes it still takes an hour.
