Date: Mon, 10 Jan 2011 19:42:21 -0500 From: Mark Saad <nonesuch@longcount.org> To: stable@freebsd.org Subject: Re: Enabling DDB prevent kernel from panicing Message-ID: <AANLkTimBf1BxuJK4h5WJmreqAo4BQz_TwAbrPvNwYqm=@mail.gmail.com> In-Reply-To: <AANLkTimaaM6Vb-V4-yyocJKax9mFSQxtAJw5mEom=AC-@mail.gmail.com> References: <AANLkTinp76kxbRu6y0=Qfe9PiuDUPiUuU7zbQ24nkp8B@mail.gmail.com> <AANLkTimaaM6Vb-V4-yyocJKax9mFSQxtAJw5mEom=AC-@mail.gmail.com>
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On Mon, Jan 10, 2011 at 6:59 PM, <nickolasbug@gmail.com> wrote: > Hello, Mark > > 2011/1/11 Mark Saad <nonesuch@longcount.org>: >> All >> This was originally posted to hackers@ >> >> I have a good question that I cant find an answer for. I believe >> found a kernel bug in 7.3-RELEASE that prevents me from booting 64-bit >> kernels on HP's DL360 G4p . The kernel dies with "Fatal trap 12: page >> fault while in kernel mode " . The hardware works fine in 7.2-RELEASE >> amd64, 7.1-RELEASE amd64, and 6.4-RELEASE amd64 . >> >> In 7.3-RELEASE amd64 I can not boot from cd or pxe correctly using the >> stock 7.3-RELEASE amd64 kernel however i386 works fine. To see if this >> issue was some how fixed in 7.3-RELEASE-p4 amd64 I rebuilt a GENERIC >> kernel using patches sources and tried to boot and I got the same >> crash. >> >> =C2=A0Next I rebuilt the kernel with KDB and DDB to see if I could get a >> core-dump of the system. I also set loader.conf to >> >> kernel=3D"kernel.DEBUG" >> kern.dumpdev=3D"/dev/da0s1b" >> >> Next I pxebooted =C2=A0the box and the system does not crash on boot up,= it >> will easily load a nfs root and work fine. So I copied my debug >> kernel, and loader.conf to the local disk and rebooted and it boots >> fine from the local disk . > > Looks like a race condition. > Well, you don't need to compile KDB and DDB, just add > > makeoptions DEBUG=3D-g > > into your kernel config file and rebuild kernel. > > Then after you got a crash dump you can easy debug it (see FreeBSD > Developers Handbok): > http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug-gdb.h= tml > > > wbr, > Nickolas > Sorry let me clarify the issue, When you install a generic 7.3-RELEASE amd64 on some of the HP servers I use, the kernel panics in boot up when it probes the sio driver . Here is a part of my dmesg.boot file atkbd0: [ITHREAD] psm0: <PS/2 Mouse> irq 12 on atkbdc0 psm0: [GIANT-LOCKED] psm0: [ITHREAD] psm0: model Generic PS/2 mouse, device ID 0 sio0: configured irq 4 not in bitmap of probed irqs 0 sio0: port may not be enabled sio0: configured irq 4 not in bitmap of probed irqs 0 sio0: port may not be enabled sio0: <Standard PC COM port> port 0x3f8-0x3ff irq 4 on acpi0 sio0: type 16550A sio0: [FILTER] Say about here in the boot up , is where the box crashes with the above noted error. If I then boot the same box off a 7.1-RELEASE amd64 netboot server , mount the local disks of the 7.3-RELEASE install and edit the /boot/device.hints and comment out the sio hints like this hint.vga.0.at=3D"isa" hint.sc.0.at=3D"isa" hint.sc.0.flags=3D"0x100" #hint.sio.0.at=3D"isa" #hint.sio.0.port=3D"0x3F8" #hint.sio.0.flags=3D"0x10" #hint.sio.0.irq=3D"4" #hint.sio.1.at=3D"isa" #hint.sio.1.port=3D"0x2F8" #hint.sio.1.irq=3D"3" #hint.sio.2.at=3D"isa" #hint.sio.2.disabled=3D"1" #hint.sio.2.port=3D"0x3E8" #hint.sio.2.irq=3D"5" #hint.sio.3.at=3D"isa" #hint.sio.3.disabled=3D"1" #hint.sio.3.port=3D"0x2E8" #hint.sio.3.irq=3D"9" hint.ppc.0.at=3D"isa" hint.ppc.0.irq=3D"7" then boot the server off the local disks , the server boots correctly. The odd thing was, I rebuilt a debug 7.3-RELEASE amd64 kernel on another working server, and installed it on the broken server and booted it off the local disks, with out any changes to the hints file and the server booted correctly and I was able to manually break out into the debugger , but nothing looked wrong . So to sum this up there is something broken in 7.3-RELEASE but I cant figure out what. This server works with a generic install of 7.1-RELEASE 7.2-RELEASE , 6.1-RELEASE, 6.2-RELEASE and 6.4-RELEASE in both amd64 and i386 , but not 7.3-RELEASE in amd64 . It also worked in 7.4-RC1 . avg recommended I see what changed from r212964 to r212994 I am currently looking into this . Has anyone seen this before ? --=20 mark saad | nonesuch@longcount.org
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