On Wed, 26 Feb 2014, Fernando Luis Vázquez Cao wrote: > I noticed that after hot unplugging a Logitech unifying receiver > (drivers/hid/hid-logitech-dj.c) the kernel would occasionally spew a > stack trace similar to this: > > usb 1-1.1.2: USB disconnect, device number 7 > WARNING: CPU: 0 PID: 2865 at fs/sysfs/group.c:216 device_del+0x40/0x1b0() > sysfs group ffffffff8187fa20 not found for kobject 'hidraw0' > [...] > CPU: 0 PID: 2865 Comm: upowerd Tainted: G W 3.14.0-rc4 #7 > Hardware name: LENOVO 7783PN4/ , BIOS 9HKT43AUS 07/11/2011 > 0000000000000009 ffffffff814cd684 ffff880427ccfdf8 ffffffff810616e7 > ffff88041ec61800 ffff880427ccfe48 ffff88041e444d80 ffff880426fab8e8 > ffff880429359960 ffffffff8106174c ffffffff81714b98 0000000000000028 > Call Trace: > [<ffffffff814cd684>] ? dump_stack+0x41/0x51 > [<ffffffff810616e7>] ? warn_slowpath_common+0x77/0x90 > [<ffffffff8106174c>] ? warn_slowpath_fmt+0x4c/0x50 > [<ffffffff81374fd0>] ? device_del+0x40/0x1b0 > [<ffffffff8137516f>] ? device_unregister+0x2f/0x50 > [<ffffffff813751fa>] ? device_destroy+0x3a/0x40 > [<ffffffffa03ca245>] ? drop_ref+0x55/0x120 [hid] > [<ffffffffa03ca3e6>] ? hidraw_release+0x96/0xb0 [hid] > [<ffffffff811929da>] ? __fput+0xca/0x210 > [<ffffffff8107fe17>] ? task_work_run+0x97/0xd0 > [<ffffffff810139a9>] ? do_notify_resume+0x69/0xa0 > [<ffffffff814dbd22>] ? int_signal+0x12/0x17 Applied, thanks. I have slightly modified the patch title to make sure that it's obvious that what it fixes is actually a WARN_ON() splat. -- Jiri Kosina SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
