Date: Thu, 13 Dec 2012 14:29:16 +0200 From: Volodymyr Kostyrko <c.kworr@gmail.com> To: Dimitry Andric <dim@FreeBSD.org> Cc: freebsd-current@freebsd.org, fs@freebsd.org Subject: Re: clang compiled kernel panic when mounting zfs root on i386 Message-ID: <50C9CA1C.8030002@gmail.com> In-Reply-To: <50C8DC8E.1080204@FreeBSD.org> References: <50b37d46.8584440a.735c.ffffb4e6@mx.google.com> <20121126171658.GD3013@kib.kiev.ua> <20121127071243.D1255@besplex.bde.org> <20121129232944.GQ3013@kib.kiev.ua> <50b8a9c5.e64dec0a.1d88.133a@mx.google.com> <20121130164715.GW3013@kib.kiev.ua> <50b9cf0c.0fd9650a.5bbf.ffffb9b3@mx.google.com> <20121203224132.GJ3013@kib.kiev.ua> <50C880D7.1040907@gmail.com> <50C8DC8E.1080204@FreeBSD.org>
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12.12.2012 21:35, Dimitry Andric: > On 2012-12-12 14:04, Volodymyr Kostyrko wrote: >> 04.12.2012 00:41, Konstantin Belousov: >>> Please try the patch below. It might give an immediate relief, but still >>> there are many offenders in the backtrace. >> >> I'm having almost the same issue and the patch doesn't work for me. > ... > > Looking at the stack frame addresses, it seems some of them are mangled. > Did you type this by hand? The differences between subsequent frames > are a bit strange because of it (and because of awk's integer > processing): Yes, I had typed that by hand. I attached link to the pictures just in case. > The kernel stack is just 8,192 bytes; since you can see these routines > are all consuming massive amounts of stack, and the calls are very > deeply nested, it is almost inevitable that it would crash. > > Especially the recursive spa_load and traverse_visitbp calls are scary, > because that can grow out of hand very quickly. It is probably tricky > to remove the recursion... After playing more with this kernel I also found it can crash not only by this scenario. There are different possible ways. I actually don't think there's a point fixing it right now. New clang is coming anyway... -- Sphinx of black quartz, judge my vow.
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