<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Paul,<div><br></div><div>Thanks. I have just had the key moved by the guys at the data centre, and I was pleased to find it works ok in another box:</div><div><br></div><div><div>Bus 005 Device 002: ID 20df:0001 Simtec Electronics Entropy Key [UDEKEY01]</div><div><br></div><div>I have been looking at the original machine for problems. It is a standard Debian server which hasn't been toyed with, but the problem seems to be with udevd and khubd. I have included some of the relevant dmesg output below, which is output shortly after an otherwise clean boot up. Perhaps the USB controllers on this server are not compatible with Linux (but that seems a bit unlikely).</div><div><br></div><div>Do you have any suggestions about this? </div><div><br></div><div>Regards</div><div>Michael</div><div><br></div><div><div><font class="Apple-style-span" face="'Courier New'">[ 719.084906] INFO: task khubd:119 blocked for more than 120 seconds.</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.084993] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085080] khubd D ffff88080ae53540 0 119 2 0x00000000</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085083] ffff8807e7a3c9f0 0000000000000046 0000000000000000 ffff8807eae35610</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085085] 0000000000013540 ffff8807e74fbfd8 ffff8807e74fbfd8 ffff8807e7a3c9f0</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085087] 0000000000000246 00000001813585d4 ffffffffa00351c0 ffff8807eaf15440</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085090] Call Trace:</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085102] [<ffffffffa00232a6>] ? usb_kill_urb+0xa2/0xbe [usbcore]</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085106] [<ffffffff8105f5ef>] ? add_wait_queue+0x3c/0x3c</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085110] [<ffffffffa0023d4f>] ? usb_start_wait_urb+0x7f/0xbe [usbcore]</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085113] [<ffffffff810eb675>] ? __kmalloc+0x100/0x112</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085117] [<ffffffffa0023fb2>] ? usb_control_msg+0xda/0x105 [usbcore]</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085119] [<ffffffff810eb745>] ? kmem_cache_alloc_trace+0xbe/0xce</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085122] [<ffffffffa001dc4c>] ? hub_port_init+0x247/0x673 [usbcore]</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085125] [<ffffffffa0020001>] ? hub_thread+0x7b6/0xe31 [usbcore]</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085128] [<ffffffff81037ec0>] ? set_next_entity+0x32/0x55</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085130] [<ffffffff8105f5ef>] ? add_wait_queue+0x3c/0x3c</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085133] [<ffffffffa001f84b>] ? usb_remote_wakeup+0x2f/0x2f [usbcore]</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085135] [<ffffffff8105efa9>] ? kthread+0x76/0x7e</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085137] [<ffffffff8135f6f4>] ? kernel_thread_helper+0x4/0x10</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085139] [<ffffffff8105ef33>] ? kthread_worker_fn+0x139/0x139</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085141] [<ffffffff8135f6f0>] ? gs_change+0x13/0x13</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085147] INFO: task udevd:378 blocked for more than 120 seconds.</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085220] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085307] udevd D ffff88080ae93540 0 378 310 0x00000000</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085309] ffff8807e75c0140 0000000000000082 0000000000000000 ffff8807eae548b0</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085311] 0000000000013540 ffff8807e76ddfd8 ffff8807e76ddfd8 ffff8807e75c0140</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085313] ffff8807e9bdbb80 ffff88080bffbc08 00000000000000d0 ffff8807e6da90e8</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085315] Call Trace:</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085317] [<ffffffff81357bbf>] ? __mutex_lock_common.isra.5+0xff/0x164</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085319] [<ffffffff81357aad>] ? mutex_lock+0x1a/0x2d</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085320] [<ffffffff810e402e>] ? alloc_pages_current+0xbc/0xcc</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085324] [<ffffffffa0028604>] ? show_product+0x16/0x41 [usbcore]</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085327] [<ffffffff8124c455>] ? dev_attr_show+0x1e/0x46</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085329] [<ffffffff810b7711>] ? __get_free_pages+0x6/0x42</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085332] [<ffffffff8114e244>] ? sysfs_read_file+0xa8/0x12e</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085334] [<ffffffff810f9571>] ? vfs_read+0x9f/0xe6</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085336] [<ffffffff810f95fd>] ? sys_read+0x45/0x6b</font></div><div><font class="Apple-style-span" face="'Courier New'">[ 719.085338] [<ffffffff8135d592>] ? system_call_fastpath+0x16/0x1b</font></div></div></div></body></html>