Date: Fri, 12 Dec 2008 10:38:56 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: Kostik Belousov <kostikbel@gmail.com> Cc: Randy Bush <randy@psg.com>, Bartosz Stec <admin@kkip.pl>, FreeBSD Current <current@freebsd.org> Subject: Re: panic: sleeping thread & bufwrite: buffer is not busy??? Message-ID: <alpine.BSF.1.10.0812121037360.41885@fledge.watson.org> In-Reply-To: <20081212095238.GY2038@deviant.kiev.zoral.com.ua> References: <4940A685.7040608@psg.com> <494216C2.7080606@kkip.pl> <20081212095238.GY2038@deviant.kiev.zoral.com.ua>
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On Fri, 12 Dec 2008, Kostik Belousov wrote: >> Unfortunately I cannot provide more debug information at this time >> because kernel was built without debugging options. (I will rebuild it >> if needed) However I can still provide some info: >> - kernel panic while loading modules, just after loding ZFS module (I >> have RAIDZ configuration) and after a couple of minutes without any >> visible action on the screen. >> - I have this panic with *every* build I made after 7 Dec 2008, but I >> don't remember wchich day exactly I have experienced that for the first >> time. >> - For now I'm using kernel builded 7 Dec 2008 and no panic seen at all. > > You are mixing the issues without a reason. To claim that you problem is > similar, you need to show the similar backtrace. The panic shown is the late > manifestation of a problem, it is kind a catch-all for some sort of locking > issues. This is the second report of weird rwlock-related panics in a week. We should read the code on this one closely, but I can't help but notice that it's similar to Roman's report of an rwlock-related panic. Was there a locking/scheduling change in the last week or two in -current that could explain these symptoms? Robert N M Watson Computer Laboratory University of Cambridge
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