Date: Sun, 9 Oct 2005 12:07:25 +1000 From: Peter Jeremy <PeterJeremy@optushome.com.au> To: Mark Kirkwood <markir@paradise.net.nz> Cc: Joseph Peralta <jperalta17@gmail.com>, freebsd-current@freebsd.org Subject: Re: errors during buildworld Message-ID: <20051009020725.GC223@cirb503493.alcatel.com.au> In-Reply-To: <43486C48.3090404@paradise.net.nz> References: <a5150ee2050921103379f89fe8@mail.gmail.com> <20050921174155.GB80991@xor.obsecurity.org> <43486C48.3090404@paradise.net.nz>
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On Sun, 2005-Oct-09 14:03:04 +1300, Mark Kirkwood wrote: >- Tested cpus with cpuburn (2xburnP6 for 1 hour). >- Tested memory with memtest-86 (about 6 hours). memtest-86 and cpuburn can demonstrate that there is a fault but not that there isn't. Pattern-sensitive memory errors, in particular, are very unlikely to be detected. Also, the above tests are focussed on specific subsystems and would not pick up a problem was was triggered by interactions between different subsystems (eg there is no disk or PCI I/O in the above tests). >The system passes these tests easily, so I am finding it hard to see >hardware problems (Indeed the system is well ventilated and cooled Cooling isn't the only hardware problem. Marginal PSUs or marginal electros on the motherboard are also quite common - especially if the hardware is getting old. Electrolytic capacitors have a finite life and this is shortened by heat and high ripple currents - both of which are common in computers. >I removed /usr/obj/usr/src/* and tried buildworld again, and it went >through that time (am running the updated system now)... That suggests a hardware problem to me. >So it's a bit confusing, could we be seeing a real gcc bug? gcc is deterministic so a real gcc bug is more likely to manifest as a consistent failure at the same point. A problem that moves around and isn't always there is more indicative of a hardware issue. -- Peter Jeremy
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