Date: Wed, 27 Nov 2013 11:35:19 -0800 (PST) From: Don Lewis <spamvictim@catspoiler.org> To: kostikbel@gmail.com Cc: freebsd-current@FreeBSD.org Subject: Re: panic: double fault with 11.0-CURRENT r258504 Message-ID: <201311271935.rARJZJfC042361@gw.catspoiler.org> In-Reply-To: <20131127192008.GD59496@kib.kiev.ua>
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On 27 Nov, Konstantin Belousov wrote: > On Wed, Nov 27, 2013 at 11:02:57AM -0800, Don Lewis wrote: >> On 27 Nov, Konstantin Belousov wrote: >> > On Wed, Nov 27, 2013 at 10:33:30AM -0800, Don Lewis wrote: >> >> On 27 Nov, Konstantin Belousov wrote: >> >> > On Wed, Nov 27, 2013 at 09:41:36AM -0800, Don Lewis wrote: >> >> >> On 27 Nov, Konstantin Belousov wrote: >> >> >> > On Wed, Nov 27, 2013 at 02:49:12AM -0800, Don Lewis wrote: >> >> >> >> <http://people.freebsd.org/~truckman/doublefault2.JPG>; >> >> >> > >> >> >> > What is the instruction at cpu_switch+0x9b ? >> >> >> >> >> >> movl 0x8(%edx),%eax >> >> > So it is line 176 in swtch.s. Is machine still in ddb, or did you >> >> > obtained the core ? If yes, please print out the content of words at >> >> > 0xe4f62bb0 + 4, +8 (*), +16. Please print the content of the word at >> >> > address (*) + 8. >> >> >> >> It is still in ddb. >> >> >> >> <http://people.freebsd.org/~truckman/doublefault3.JPG>, though not in >> >> the above order. >> > Uhm, sorry, I mistyped the last part of the instructions. >> > >> > The new thread pointer is 0xd2f4e000, there is nothing incriminating. >> > Please print the word at 0xd2f4e000+0x254 == 0xd2f4e254, which would be >> > the address of the new thread pcb. It is load from the pcb + 8 which >> > faults. >> >> 0xf3d44d60 > Again, the pointer looks fine, and its tail is 0xd60, which is correct for > the pcb offset in the last page of the thread stack. > > Please do 'show thread 0xd2f4e000' before trying below instructions. Ok, see below: > What happens if you try to read word at 0xf3d44d68 ? Nothing bad ... <http://people.freebsd.org/~truckman/doublefault4.JPG>;
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