Messages in this thread | | | Date | Wed, 29 Oct 2008 16:25:52 +0100 | From | Folkert van Heusden <> | Subject | Re: [2.6.26] kobject_add_internal failed for 2:0 with -EEXIST / unable to handle kernel NULL pointer dereference in sysfs_create_link |
| |
> >> >> > While running my http://vanheusden.com/pyk/ script (which randomly > >> >> > inserts and removes modules) I triggered the folllowing oops in a 2.6.26 > >> >> > kernel on an IBM xSeries 260. This oops (in fact no oops at all) did not > >> >> > get triggered in a 2.6.18 kernel on that system. > >> >> > > >> >> > [ 42.507375] FDC 0 is a National Semiconductor PC87306 > >> >> > [ 42.509057] kobject_add_internal failed for 2:0 with -EEXIST, don't try to register things with the same name in the same directory. > >> >> > [ 42.509291] Pid: 5301, comm: modprobe Not tainted 2.6.26-1-amd64 #1 > >> >> > [ 42.509431] > >> >> > [ 42.509433] Call Trace: > >> >> > [ 42.509685] [<ffffffff8031b031>] kobject_add_internal+0x13f/0x17e > > ... > >> >> > [ 42.511519] [<ffffffff8027d23b>] bdi_register+0x57/0xb4 > >> >> > >> >> Looks like bdi sees two devices with the same devnum, or didn't > >> >> cleanup an old entry. What does: ls -l "/sys/class/bdi/" print? > >> > > >> > The following: > >> > folkert@debiantesthw:~$ ls -l /sys/class/bdi/ > >> > drwxr-xr-x 3 root root 0 2008-10-28 18:32 2:0 > >> > drwxr-xr-x 3 root root 0 2008-10-28 18:32 2:1 > >> > >> Oh, you are running the old sysfs layout without symlinks. Care to > >> tell where the "device" link in these directories points to? > > > > None exist: > > folkert@debiantesthw:~$ ls -la /sys/class/bdi/*/device > > ls: cannot access /sys/class/bdi/*/device: No such file or directory > > Ah, sorry. Seems the bdi stuff never got to pass the usual parent > device with the device registration, to let the bdi device show up at > the right place in the device tree. > > Let's see what current devices on your box have the major 2: > find /sys -name dev | xargs grep '^2:'
/sys/block/fd0/dev:2:0 /sys/block/fd1/dev:2:1
As my script does modprobe/rmmod in parallel (4 processes) maybe it is a conflict of one process doing an modprobe of floppy while the other does an rmmod? Or both a modprobe?
Folkert van Heusden
-- Multi tail barnamaj mowahib li mora9abat attasjilat wa nataij awamir al 7asoub. damj, talwin, mora9abat attarchi7 wa ila akhirih. http://www.vanheusden.com/multitail/ ---------------------------------------------------------------------- Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com
| |