From: Daniel Lang <dl@leo.org> To: grog@FreeBSD.org Cc: freebsd-bugs@FreeBSD.org, freebsd-gnats-submit@freebsd.org Subject: Re: kern/21148: multiple crashes while using vinum Message-ID: <20000918085310.3C10437B43C@hub.freebsd.org> In-Reply-To: <200009100106.SAA58198@freefall.freebsd.org>; from grog@FreeBSD.org on Sun, Sep 10, 2000 at 03:08:11AM %2B0000 References: <200009100106.SAA58198@freefall.freebsd.org>
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Hi, to further trace the problem, as the crash-dumps seemed not to produce any usable stack traces, I hooked the box up to a remote debugging session with DDB/GDB. (No problem to panic the box, as described). As far as I can tell, the crash did not happen inside the vinum-module. This may be the cause, why your .gdbinit scripts don't seem to apply, I guess. The crash happened inside the ata driver, but it seems that a former valid pointer is overwritten somehow, so that it contains garbage, which leads to the crash (I assume that the 'struct ata_softc' is corrupted). This probably comes from a buffer overrun somewhere else, that writes into already allocated memory. Unfortunately such errors are very difficult to trace (well at least for my experience). Since the error only appears on the system with a vinum RAID-5 and only and reproducible while accessing this filesystem, I (possibly naive) assume it must be a problem with vinum. Unfortunatelty I guess we are stuck here, since I am not able to produce more data that could help with the problem. However I would grant access to the machine and the debugger, if someone would like to inspect the situation personally. Best regards, Daniel Lang -- IRCnet: Mr-Spock - Truth lies in the eye of the beholder - *Daniel Lang * dl@leo.org * +49 89 289 25735 * http://www.leo.org/~dl/* To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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