Re: problem with cold hardware? [Was: panic in callout_reset: bad link in callwheel]
Andriy Gapon schrieb: on 28/01/2009 21:22 Andrew Snow said the following: Andriy Gapon wrote: Previously I heard about problems with hardware running hot, but not with it being cold. I put the word in quotes, because the system is in a room with normal room temperature. Any guesses what hardware part might be acting up like this? Power supply. Give all the capacitors a visual check. Or you may be drawing too much power from your rated supply. Right on the target. I opened the PSU after replacing it, visually it looks OK (too me), nevertheless I have verified that the fault was in it. Thank you and everybody who helped! Electronic devices, including computers, that become unable to /cold/ boot (and need a reset some seconds or minutes after power-up) usually suffer from dry or leaked capacitors, either in the PSU or - I've seen that more often - the voltage regulator on the main board. Dry capacitors often look innocuous, unlike leaked ones that show brownish stains (electrolytes) on the cap or underneath. ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: problem with cold hardware? [Was: panic in callout_reset: bad link in callwheel]
on 28/01/2009 21:22 Andrew Snow said the following: Andriy Gapon wrote: Previously I heard about problems with hardware running hot, but not with it being cold. I put the word in quotes, because the system is in a room with normal room temperature. Any guesses what hardware part might be acting up like this? Power supply. Give all the capacitors a visual check. Or you may be drawing too much power from your rated supply. Right on the target. I opened the PSU after replacing it, visually it looks OK (too me), nevertheless I have verified that the fault was in it. Thank you and everybody who helped! -- Andriy Gapon ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
problem with cold hardware? [Was: panic in callout_reset: bad link in callwheel]
on 24/01/2009 13:00 Andriy Gapon said the following: [snip] Additional info: I recently added some new memory to this system. The memory survived several passes of memtest86 before booting to FreeBSD. It also survived one pass after the incident. Still I wouldn't exclude a possibility of it being bad. I think that I established that the crash was because of hardware issue. I had another panic at a different place but with the similar diagnostics - bad pointer passed to a call. Fortunately, the second time the pointer was to a well-known long-lived object. So I was able to compare the bad pointer to an actual address. It turned out that a single bit was flipped. Then I realized that in both cases I saw panics after very cold boots, i.e. the system was powered down for more than 1 hour before the boot. So I performed memtest86 run again, this time also after a long power-off. And it reported lots of errors. I restarted memtest86 10 minutes later and then it could not find any errors in any tests. Previously I heard about problems with hardware running hot, but not with it being cold. I put the word in quotes, because the system is in a room with normal room temperature. Any guesses what hardware part might be acting up like this? -- Andriy Gapon ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: problem with cold hardware? [Was: panic in callout_reset: bad link in callwheel]
Andriy Gapon wrote: Previously I heard about problems with hardware running hot, but not with it being cold. I put the word in quotes, because the system is in a room with normal room temperature. Any guesses what hardware part might be acting up like this? Power supply. Give all the capacitors a visual check. Or you may be drawing too much power from your rated supply. - Andrew ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: problem with cold hardware? [Was: panic in callout_reset: bad link in callwheel]
On Thu, Jan 29, 2009 at 06:22:26AM +1100, Andrew Snow wrote: Andriy Gapon wrote: Previously I heard about problems with hardware running hot, but not with it being cold. I put the word in quotes, because the system is in a room with normal room temperature. Any guesses what hardware part might be acting up like this? Power supply. Give all the capacitors a visual check. Or you may be drawing too much power from your rated supply. Another thing could be bad soldering of the memory slot. It might not have a full contact when at room temperature, but as it heats up by 10-20C inside the case it might expand and give full contact. This could apply to copper runs on the board, contact points from the board to the memory slot, contact from the slot to the memory. -- Regards, Ulf. - Ulf Zimmermann, 1525 Pacific Ave., Alameda, CA-94501, #: 510-865-0204 You can find my resume at: http://www.Alameda.net/~ulf/resume.html ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
