Date: Mon, 9 Jul 2007 21:18:03 +0200 From: "Attilio Rao" <attilio@freebsd.org> To: "Doug Rabson" <dfr@rabson.org> Cc: freebsd-emulation@freebsd.org Subject: Re: experimental qemu-devel port update, please test! Message-ID: <3bbf2fe10707091218p713b7e3ela2833eec0ba2df13@mail.gmail.com> In-Reply-To: <200707092000.29768.dfr@rabson.org> References: <20070702203027.GA45302@saturn.kn-bremen.de> <46925324.9010908@freebsd.org> <3bbf2fe10707091140h6cdc7469nac5be03a8c8a60cb@mail.gmail.com> <200707092000.29768.dfr@rabson.org>
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2007/7/9, Doug Rabson <dfr@rabson.org>: > On Monday 09 July 2007, Attilio Rao wrote: > > 2007/7/9, Eric Anderson <anderson@freebsd.org>: > > > Fatal trap 12: page fault while in kernel mode > > > cpuid = 0; apic id = 00 > > > fault virtual address = 0x82 > > > fault code = supervisor read, page not present > > > instruction pointer = 0x20:0xc0928f00 > > > stack pointer = 0x28:0xe57b7a3c > > > frame pointer = 0x28:0xe57b7a50 > > > code segment = base 0x0, limit 0xfffff, type 0x1b > > > = DPL 0, pres 1, def32 1, gran 1 > > > processor eflags = interrupt enabled, resume, IOPL = 0 > > > current process = 69 (qemu) > > > > > > > > > #9 0xc0928f00 in _vm_map_lock (map=0x1, file=0x0, line=0) at > > > /usr/src/sys/vm/vm_map.c:421 > > > #10 0xc092986d in vm_map_wire (map=0x1, start=677306368, > > > end=677310464, flags=1) at /usr/src/sys/vm/vm_map.c:1964 > > > > Please also note that stack here seems highly corrupted since values > > passed to _vm_map_lock are not possible (or there is something > > serious going on with them). > > I had this exact same crash when attempting to use kqemu on a recent > current. It appears as if the value it got for curproc was bad. Is > kqemu messing with the kernel's %fs value perhaps? I don't know about kqemu, but in this case I would expect sorta of larger corruption due to the wider pcpu accesses done through %fs. Attilio -- Peace can only be achieved by understanding - A. Einstein
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