Re: building af_packet as a kernel module
On Mon, 03 Jul 2017 16:36:01 +0200, Kamil Konieczny said: > https://stackoverflow.com/questions/448999/is-there-a-way-to-figure-out-what-is-using-a-linux-kernel-module > and short answer is to use 'lsof' command (ls open files), > if lsmod fails to give ref info That's the short - and incorrect - answer. The long and *much* more correct answer is on that link, and talks about the kernel tracing facility. lsof only helps if the module is in use due to a direct reference on a filesystem object (something you can /bin/ls). So for instance, if you're trying to figure out why a serial driver won't unload, finding that somebody has /dev/ttyUSB0 open may help. But it *won't* help if it's a an indirect reference (a filesystem object is open, but it's a filesystem on a USB memory device, and the mount of /dev/sdb1 ends up taking a reference on the SCSI driver which ends up taking its own reference on the USB driver(s) involved), or a reference via a non-filesystem opbject. And on Linux, network interfaces aren't filesystem objects - there isn't a /dev/eth0 for your ethernet. That's why you have to use netlink to enumerate your interfaces. The *correct* short answer is, of course, "use trace-cmd or kernelshark to trace calls to module_get for the problem module". :) pgpet7C1RIZYr.pgp Description: PGP signature ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: building af_packet as a kernel module
Hi, On 30.06.2017 06:06, Kevin Wilson wrote: > [...] > I am using Ubuntu 16.04. > > After reboot, the af_packet.ko kernel module is loaded: > lsmod > af_packet 45056 2 > > But I cannot remove it: > rmmod af_packet > rmmod: ERROR: Module af_packet is in use > > I want to be able to rmmod it, for adding debug printing, etc. > [...] I googled this: https://stackoverflow.com/questions/448999/is-there-a-way-to-figure-out-what-is-using-a-linux-kernel-module and short answer is to use 'lsof' command (ls open files), if lsmod fails to give ref info -- Best regards, Kamil Konieczny Samsung R Institute Poland ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: building af_packet as a kernel module
On 03.07.2017 16:02, Aruna Hewapathirane wrote: > [...] > enable internet by running : /sbin/ifconfig etho0 down sudo /sbin/ifconfig eno1 up or eth0 or whatever your system names its ethernet devices > [...] List net interfaces with: sudo /sbin/ifconfig -- Best regards, Kamil Konieczny Samsung R Institute Poland ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: building af_packet as a kernel module
> On Fri, Jun 30, 2017 at 12:06 AM, Kevin Wilsonwrote: > Hello, > I have tried to set CONFIG_PACKET=m in kernel 4.11 and rebuilt the > kernel and rebooted. > I am using Ubuntu 16.04. > After reboot, the af_packet.ko kernel module is loaded: > lsmod > shows: > af_packet 45056 2 > But I cannot remove it: > rmmod af_packet > rmmod: ERROR: Module af_packet is in use > I want to be able to rmmod it, for adding debug printing, etc. > How can I find which applications uses it ? (So I will be able to stop > them, rmmod af_packet, and then insmod it again)? > Regards, > Kevin Hello Kevin, Quick fix and short answer to your problem is to disable internet. run this in a shell/terminal: /sbin/ifconfig etho0 down Now check lsmod again, once internet is disabled the used by column which lsmod reports as af_packet being used by 2 devices/processes/whatever... will show 0. Now when you sbin/rmmod af-packet it will work and unload af_packet. Do whatever debug printing you have to sbin/insmod af_packet enable internet by running : /sbin/ifconfig etho0 down now check dmesg or what ever you use. Wash, rinse then repeat as needed. The answer to your question "How can I find which applications uses it ?" is something "I" have been trying to figure out for the last 9 odd years. Maybe folks with more experience can shed some light on how to go about doing this ? More experienced equates to = Valdis / Gregkh / DerRichard / Realtime localmodconfig Steve Rostedt and too many others to name :) Hope this helps - Aruna ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
building af_packet as a kernel module
Hello, I have tried to set CONFIG_PACKET=m in kernel 4.11 and rebuilt the kernel and rebooted. I am using Ubuntu 16.04. After reboot, the af_packet.ko kernel module is loaded: lsmod shows: af_packet 45056 2 But I cannot remove it: rmmod af_packet rmmod: ERROR: Module af_packet is in use I want to be able to rmmod it, for adding debug printing, etc. How can I find which applications uses it ? (So I will be able to stop them, rmmod af_packet, and then insmod it again)? Regards, Kevin ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies