Messages in this thread | | | Date | Sat, 17 Jan 2004 11:54:41 -0800 | From | George Anzinger <> | Subject | Re: KGDB 2.0.3 with fixes and development in ethernet interface |
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Amit S. Kale wrote: > On Saturday 17 Jan 2004 6:53 am, George Anzinger wrote: > >>Pavel Machek wrote: >> >>>Hi! >>> >>> >>>>KGDB 2.0.3 is available at >>>>http://kgdb.sourceforge.net/kgdb-2/linux-2.6.1-kgdb-2.0.3.tar.bz2 >>>> >>>>Ethernet interface still doesn't work. It responds to gdb for a couple of >>>>packets and then panics. gdb log for ethernet interface is pasted below. >>>> >>>>It panics and enter kgdb_handle_exception recursively and silently. To >>>>see the panic on screen make kgdb_handle_exception return immediately if >>>>kgdb_connected is non-zero. >>>> >>>>Panic trace is pasted below. It panics in skb_release_data. Looks like >>>>skb handling will have to changed to be have kgdb specific buffers. >>> >>>This seems to be needed (if I unselect CONFIG_KGDB_THREAD, I get >>>compile error on x86-64). >> >>Amit, could you explain why this is an option? It seems very useful and >>not really too much code... > > > It saves all registers before switch_to. It does that two times at present. > Once (implicit) register save by gcc and an explicit register save in > arch/<proc>/kernel/entry.S Second register save in kern_schedule generates a > pt_regs structure which gdb can get all registers at once from. If it's > omited, gdb has to figure out where gcc has saved registers from the > non-standards code in switch_to, which it can't do correctly all the time. > > We can have a check for (a new variable) debugger_enabled before calling > kern_schedule. That'll be add negligible overhead and will allow extra thread > info to be saved only when a debugger is enabled. There will not be any need > for CONFIG_KGDB_THREAD also.
I don't seem to have such a problem with the mm kgdb. No kern_schedule there...
-- George Anzinger george@mvista.com High-res-timers: http://sourceforge.net/projects/high-res-timers/ Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml
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