Messages in this thread | | | Date | Tue, 21 Nov 2006 12:56:20 -0800 | From | "Thushara Wijeratna" <> | Subject | Re: some help in kernel debugging |
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Samuel, thanks much for the pointers, I'm following up on UML. BTW, I fixed my earlier problem after realizing (a chat with a Linux savvy friend had nothing to do with it...) Basically I made the initrd image on the dev machine for the same kernel version and copied it over to the test machine, it then booted.
I can now actually attach gdb and poke around and try to figure out why it is throwing a SIGSEV. I have a stack like this:
Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 1] 0x00000000 in ?? () (gdb) bt #0 0x00000000 in ?? () #1 0xc03051db in psmouse_interrupt (serio=0xc048cde0, data=250 '\uffff', flags=0, regs=0x0) at drivers/input/mouse/psmouse-base.c:206 #2 0xc030882a in i8042_interrupt (irq=0, dev_id=0x0, regs=0x0) at drivers/input/serio/i8042.c:433 #3 0xc03084f9 in i8042_aux_write (port=0x0, c=232 '\uffff') at drivers/input/serio/i8042.c:235 #4 0xc03053bb in psmouse_sendbyte (psmouse=0xf70aa7f8, byte=232 '\uffff') at include/linux/serio.h:77
and this is the code inside psmouse-base.c that is crashing:
rc = psmouse->protocol_handler(psmouse, regs);
So I'm guessing I did't specify an option correctly in the `make menuconfig` so that the kernel identifies my mouse and installs a proper handler for it? It is a USB mouse and I thought I enabled it, but I'm guessing I missed something.
Thanks a lot for all your help, at some point I want to contribute testing builds, this is good training...
On 11/20/06, Samuel Korpi <strontianite@gmail.com> wrote: > Hi, > > I don't know what sort of debugging needs you have, exactly, but I > would suggest you take a look at User Mode Linux (UML). UML provides a > safe and pretty easy way to start you with kernel debugging and just > looking into kernel internals. It is a virtual kernel running in user > space, so it doesn't require a separate test machine, and you can > debug it with normal gdb. Furthermore, it is included in current > vanilla kernels, so you can get started without any extra patches. > > Main sources for information concerning UML are: > > Main page: http://www.user-mode-linux.org/ > HOWTO: http://user-mode-linux.sourceforge.net/UserModeLinux-HOWTO.html > Wiki: http://uml.jfdi.org/ > Precompiled kernels and root file systems: http://uml.nagafix.co.uk/ > > /Samuel Korpi > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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