Date: Wed, 1 Jul 2009 15:54:06 +0200 From: Thomas Backman <serenity@exscape.org> To: Ian Freislich <ianf@clue.co.za> Cc: current@freebsd.org Subject: Re: kgdb on an amd64 kernel anyone? Message-ID: <3EF4C954-2A84-42BA-B0F5-629B3CCC1578@exscape.org> In-Reply-To: <E1MM0Co-0004BT-Jb@clue.co.za> References: <E1MM0Co-0004BT-Jb@clue.co.za>
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On Jul 1, 2009, at 03:50 PM, Ian Freislich wrote: > Hi > > Has anyone managed to inspect a vmcore produced by an amd64 kernel > in the last few months? I've had several crashes, but all the cores > appear corrupted and no useful data can be had. > > The latest: > > [firewall2.jnb1] /var/crash # kgdb -c vmcore.5 /boot/kernel.old/kernel > GNU gdb 6.1.1 [FreeBSD] > Copyright 2004 Free Software Foundation, Inc. > GDB is free software, covered by the GNU General Public License, and > you are > welcome to change it and/or distribute copies of it under certain > conditions. > Type "show copying" to see the conditions. > There is absolutely no warranty for GDB. Type "show warranty" for > details. > This GDB was configured as "amd64-marcel-freebsd"...(no debugging > symbols found)... > Attempt to extract a component of a value that is not a structure > pointer. > Attempt to extract a component of a value that is not a structure > pointer. > Attempt to extract a component of a value that is not a structure > pointer. > Attempt to extract a component of a value that is not a structure > pointer. > #0 0x0000000000000000 in ?? () > (kgdb) bt > #0 0x0000000000000000 in ?? () > Cannot access memory at address 0x0 > > Or this followed by pages and pages stack corruption. The most > frames I've had the patience to scroll through like this is in the > 0000s. > > [firewall1.jnb1] /var/db/firewall # kgdb -c /var/crash/vmcore.4 / > boot/kernel/kernel > GNU gdb 6.1.1 [FreeBSD] > Copyright 2004 Free Software Foundation, Inc. > GDB is free software, covered by the GNU General Public License, and > you are > welcome to change it and/or distribute copies of it under certain > conditions. > Type "show copying" to see the conditions. > There is absolutely no warranty for GDB. Type "show warranty" for > details. > This GDB was configured as "amd64-marcel-freebsd"...(no debugging > symbols found)... > Attempt to extract a component of a value that is not a structure > pointer. > Attempt to extract a component of a value that is not a structure > pointer. > Attempt to extract a component of a value that is not a structure > pointer. > Attempt to extract a component of a value that is not a structure > pointer. > #0 0xffffffff802bdb8a in doadump () > (kgdb) bt > #0 0xffffffff802bdb8a in doadump () > #1 0xffffff81a4af95f0 in ?? () > #2 0xffffffff802be0bb in boot () > #3 0xe880695fa0c7c748 in ?? () > #4 0x9066eaebfff07554 in ?? () > #5 0x31804b26a0c7c748 in ?? () > #6 0xc3c900033ee2e8c0 in ?? () > #7 0x56415741e5894855 in ?? () > #8 0x48fb895354415541 in ?? () > #9 0x253c8b486528ec83 in ?? () > #10 0x000119b900000000 in ?? () > #11 0x804b26d8c2c74800 in ?? () > #12 0x65ffff14b1e8f631 in ?? () > #13 0x00000000253c8b48 in ?? () > #14 0x65000235f1e8f631 in ?? () > #15 0x0000000025148b48 in ?? () > #16 0x450c608b44028b48 in ?? () > #17 0x000004cd840fe485 in ?? () > #18 0x00000025348b4865 in ?? () > #19 0xe80c49ff0e8b4800 in ?? () > #20 0x68c7c74800148304 in ?? () > #21 0x05c7df89418048c1 in ?? () > #22 0x00000001003d81e8 in ?? () > ---Type <return> to continue, or q <return> to quit---q > > The last useful crashdump I've had was before February this year. > Do others share this experience? > > Ian I haven't had any such problems. I do often get a "broken stack?" following the rest of the BT, but they're generally useful anyway, and I've never ever seen "Attempt to extract a component of a value that is not a structure pointer" before. Regards, Thomas
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