Date: Tue, 05 Jul 2005 11:22:22 -0400 From: Gary Mu1der <gmulder@infotechfl.com> To: Gleb Smirnoff <glebius@freebsd.org> Cc: freebsd-stable@freebsd.org Subject: Re: panic in RELENG_5 UMA - two new stack traces Message-ID: <42CAA5AE.7050806@infotechfl.com> In-Reply-To: <20050701201308.GD59610@cell.sick.ru> References: <20050621090701.GB34406@cell.sick.ru> <20050621105154.GA36538@cell.sick.ru> <42B961B9.7A5856B3@freebsd.org> <20050623104230.GB61389@cell.sick.ru> <20050623141514.GD738@obiwan.tataz.chchile.org> <42BC5EE2.2020003@infotechfl.com> <20050627082958.GB97832@cell.sick.ru> <42C16BBF.4060107@infotechfl.com> <20050701085808.GD52023@cell.sick.ru> <42C58373.60008@infotechfl.com> <20050701201308.GD59610@cell.sick.ru>
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Gleb Smirnoff wrote: > G> >How often does it crash? Does debug.mpsafenet=0 increases stability? > G> > G> I can reproduce the crash within 60 seconds of firing off 30+ ping/arp > G> -d scripts, all running in parallel. > G> > G> debug.mpsafenet=0 seems to have solved the problem. I'm running 100+ > G> instances of the above script and the system has been stable for over an > G> hour. > > Thanks! We definitely see that the bug is a race, not a broken logic. I am > almost sure, that you are experiencing the same bug as I described in > the beginning of the thread. > > Although there is no yet fix available for race between 'arp -d' and > outgoing packet, there is one for race between incoming ARP reply and > outgoing packet. We will probably commit it soon, after more review. Sorry to say, but it looks like debug.mpsafenet=0 reduced the frequency of the problem, but did not eliminate it. The system crashed and hung again over the weekend with very little load. There was no kernel panic, so no core files. I can leave 5.4 on this system for a week or so before installing 4.11, if you want me to continue doing diagnostics on it. Gary
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