Messages in this thread | | | Date | Thu, 1 Mar 2012 15:41:48 -0800 (PST) | From | Andrei Warkentin <> | Subject | Re: [PATCHv3 1/3] NETPOLL: Extend rx_hook support. |
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Hi,
----- Original Message ----- > From: "Jason Wessel" <jason.wessel@windriver.com> > To: "Andrei Warkentin" <awarkentin@vmware.com> > Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, "Andrei Warkentin" <andreiw@vmware.com>, > kgdb-bugreport@lists.sourceforge.net, "Matt Mackall" <mpm@selenic.com>, "Andrei Warkentin" > <andrey.warkentin@gmail.com> > Sent: Thursday, March 1, 2012 5:24:18 PM > Subject: Re: [PATCHv3 1/3] NETPOLL: Extend rx_hook support.
> > I did have a question, because it seems you were using qemu / kvm. > I have a number of test cases that use kvm, but the netkkgdb does > not seem to work with the nc. My question is how am I supposed to > actually use the netkgdb? > > Here is what I observe on the target system: > > insmod netkgdb.ko netkgdb=@/,@10.0.2.2/ > echo g > /proc/sysrq-trigger > > On my host system: > nc.traditional -l -u -p 7777 > > I will type help, and then the netkgdb is toast. It doesn't seem to > respond anymore. >
Strange. I've just repeated your steps (I didn't build as a ko before, but now I did) and I don't see this problem. Can you tell me your qemu/kvm command line?
With qemu I've see odd behavior with ne2k_pci, which is the default (qemu would wedge) occasionally. If you are using ne2000, can you try rtl8139? Note: I just tried ne2k_pci, and other than having to specify a local IP address (something I don't need to for rtl8139). I've also realized that if you insert netkgdb as a module without any parameters, it doesn't bind to existing netdevs - that's a bug.
Anything I should know about your network topology?
Can you also apply the multi-I/O-backend patch and boot with kgdboc=kbd, and see if the VM is toast after you type "help".
A
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