On 2018-09-20 09:13:42, Alexandre Ratchov wrote: > On Wed, Sep 19, 2018 at 11:32:40PM +0200, michal.lyszc...@bofc.pl wrote: > > Hello, > > > > I've stumbled upon a weird problem. Long story short, I try to open > > fifo two times, once O_WRONLY and once O_RDONLY, both in separate > > threads - but on process. Unfortunately both threads are locked in > > open() functions. > > > > I prepared very small program that reproduces this problem for me, > > please see attached file and note that there is no error handling > > for readability. > > > > !!! Also note, this program may get stuck in D state, > > and you won't be able to SIGKILL it. > > > > Anyone got any idea why is this happening? Is something wrong with > > my code? > > This is a kernel bug, no program may behave like this. > > > It works properly on netbsd, freebsd, aix, hpux and linux. > > > > I don't know what info exactly you might need, but here is uname, > > it's almost clean system, I didn't make much changes, and > > especially not in the core. > > > > # uname -a > > OpenBSD bbs-i686-builder-openbsd.kurwinet.pl 6.2 GENERIC#163 i386 > > This is a old OpenBSD version; I reproduced it on 6.3 but not > on -current (this doesn't mean the bug was fixed).
I confirm, just upgraded my system to: OpenBSD 6.3 GENERIC#490 i386 and problem is the same. I found a workaround. When I change flags in both open() to O_RDWR, the problem goes away, it's not much but it's something. Should I post a bug report? I cannot find a way to check if that was already reported or not. -- Best Regards
