Example showing driver timeouts: ubuntu@boomer:~$ stress-ng --kill 0 -t 300 -v stress-ng: debug: [3344] 224 processors online, 224 processors configured stress-ng: info: [3344] dispatching hogs: 224 kill stress-ng: debug: [3344] /sys/devices/system/cpu/cpu0/cache does not exist stress-ng: info: [3344] cache allocate: using built-in defaults as unable to determine cache details stress-ng: info: [3344] cache allocate: default cache size: 2048K stress-ng: debug: [3344] starting stressors stress-ng: debug: [3345] stress-ng-kill: started [3345] (instance 0) stress-ng: debug: [3346] stress-ng-kill: started [3346] (instance 1) stress-ng: debug: [3347] stress-ng-kill: started [3347] (instance 2) stress-ng: debug: [3348] stress-ng-kill: started [3348] (instance 3) stress-ng: debug: [3349] stress-ng-kill: started [3349] (instance 4) [ 1447.474535] INFO: rcu_sched detected stalls on CPUs/tasks: [ 1447.480020] 27-...: (66 GPs behind) idle=1ba/140000000000000/0 softirq=3878/3878 fqs=7264 [ 1447.488363] 136-...: (93 GPs behind) idle=972/140000000000000/0 softirq=2760/2760 fqs=7265 [ 1447.496788] (detected by 161, t=15007 jiffies, g=1128, c=1127, q=790) [ 1451.646152] xhci_hcd 0000:01:04.1: xHCI host controller not responding, assume dead [ 1451.653819] xhci_hcd 0000:01:04.1: HC died; cleaning up [ 1451.653829] usb 3-1-port1: cannot reset (err = -22) [ 1451.653832] usb 3-1-port1: cannot reset (err = -22) [ 1451.653833] usb 3-1-port1: cannot reset (err = -22) [ 1451.653834] usb 3-1-port1: cannot reset (err = -22) [ 1451.653835] usb 3-1-port1: cannot reset (err = -22) [ 1451.653837] usb 3-1-port1: Cannot enable. Maybe the USB cable is bad? [ 1451.653839] usb 3-1-port1: cannot disable (err = -22) [ 1451.653848] usb 3-1-port2: cannot reset (err = -22) [ 1451.653851] usb 3-1-port2: cannot reset (err = -22) [ 1451.653852] usb 3-1-port2: cannot reset (err = -22) [ 1451.653854] usb 3-1-port2: cannot reset (err = -22) [ 1451.653855] usb 3-1-port2: cannot reset (err = -22) [ 1451.653856] usb 3-1-port2: Cannot enable. Maybe the USB cable is bad? [ 1451.653858] usb 3-1-port2: cannot disable (err = -22) [ 1451.653860] usb 3-1-port1: cannot reset (err = -22) [ 1451.653861] usb 3-1-port1: cannot reset (err = -22) [ 1451.653862] usb 3-1-port1: cannot reset (err = -22) [ 1451.653863] usb 3-1-port1: cannot reset (err = -22) [ 1451.653864] usb 3-1-port1: cannot reset (err = -22) [ 1451.653865] usb 3-1-port1: Cannot enable. Maybe the USB cable is bad? [ 1451.653866] usb 3-1-port1: cannot disable (err = -22) [ 1451.653868] usb 3-1-port2: cannot reset (err = -22) [ 1451.653870] usb 3-1-port2: cannot reset (err = -22) [ 1451.653871] usb 3-1-port2: cannot reset (err = -22) [ 1451.653872] usb 3-1-port2: cannot reset (err = -22) [ 1451.653873] usb 3-1-port2: cannot reset (err = -22) [ 1451.653873] usb 3-1-port2: Cannot enable. Maybe the USB cable is bad? [ 1451.653875] usb 3-1-port2: cannot disable (err = -22) [ 1451.653876] usb 3-1-port1: cannot reset (err = -22) [ 1451.653878] usb 3-1-port1: cannot reset (err = -22) [ 1451.653879] usb 3-1-port1: cannot reset (err = -22) [ 1451.653880] usb 3-1-port1: cannot reset (err = -22) [ 1451.653881] usb 3-1-port1: cannot reset (err = -22) [ 1451.653882] usb 3-1-port1: Cannot enable. Maybe the USB cable is bad? [ 1451.653883] usb 3-1-port1: cannot disable (err = -22) [ 1451.653885] usb 3-1-port2: cannot reset (err = -22) [ 1451.653886] usb 3-1-port2: cannot reset (err = -22) [ 1451.653887] usb 3-1-port2: cannot reset (err = -22) [ 1451.653888] usb 3-1-port2: cannot reset (err = -22) [ 1451.653889] usb 3-1-port2: cannot reset (err = -22) [ 1451.653890] usb 3-1-port2: Cannot enable. Maybe the USB cable is bad? [ 1451.653892] usb 3-1-port2: cannot disable (err = -22) [ 1451.653893] usb 3-1-port1: cannot reset (err = -22) [ 1451.653895] usb 3-1-port1: cannot reset (err = -22) [ 1451.653896] usb 3-1-port1: cannot reset (err = -22) [ 1451.653897] usb 3-1-port1: cannot reset (err = -22) [ 1451.653898] usb 3-1-port1: cannot reset (err = -22) [ 1451.653899] usb 3-1-port1: Cannot enable. Maybe the USB cable is bad? [ 1451.653900] usb 3-1-port1: cannot disable (err = -22) [ 1451.653902] usb 3-1-port2: cannot reset (err = -22) [ 1451.653903] usb 3-1-port1: cannot disable (err = -22) [ 1451.653903] usb 3-1-port2: cannot reset (err = -22) [ 1451.653905] usb 3-1-port2: cannot reset (err = -22) [ 1451.653906] usb 3-1-port2: cannot reset (err = -22) [ 1451.653907] usb 3-1-port2: cannot reset (err = -22) [ 1451.653908] usb 3-1-port2: Cannot enable. Maybe the USB cable is bad? [ 1451.653909] usb 3-1-port2: cannot disable (err = -22) [ 1451.653910] usb 3-1-port2: cannot disable (err = -22) [ 1451.653920] hub 3-1:1.0: hub_ext_port_status failed (err = -22) [ 1451.653923] hub 3-1:1.0: hub_ext_port_status failed (err = -22) [ 1626.734665] INFO: task kworker/u448:0:6 blocked for more than 120 seconds. [ 1626.741536] Not tainted 4.13.0-20-generic #23-Ubuntu [ 1626.747047] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1626.755045] INFO: task kworker/44:1:1510 blocked for more than 120 seconds. [ 1626.762006] Not tainted 4.13.0-20-generic #23-Ubuntu [ 1626.767490] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1627.478357] INFO: rcu_sched detected stalls on CPUs/tasks: [ 1627.483836] 27-...: (66 GPs behind) idle=1ba/140000000000000/0 softirq=3878/3878 fqs=29766 [ 1627.492262] 136-...: (93 GPs behind) idle=972/140000000000000/0 softirq=2760/2760 fqs=29767 [ 1627.500772] (detected by 3, t=60012 jiffies, g=1128, c=1127, q=3057) stress-ng: debug: [3345] stress-ng-kill: exite[ 1686.442707] sd 5:0:0:0: timing out command, waited 180s d [3345] (instance 0) stress-ng[ 1686.443157] sd 6:0:0:1: timing out command, waited 180s : debug: [3347] stress-ng-kill: e[ 1686.443224] sd 6:0:0:2: timing out command, waited 180s xited [3347] (instance 2) stres[ 1686.443259] sd 6:0:0:0: timing out command, waited 180s s-ng: debug: [3346] stress-ng-kill: exited [3346] (instance 1) stress-ng: debug: [3348] stress-ng-kill: exited [3348] (instance 3) stress-ng: debug: [3344] 5 stressors spawned stress-ng: debug: [3350] stress-ng-kill: started [3350] (instance 5) stress-ng: debug: [3344] process [3345] terminated stress-ng: debug: [3344] process [3346] terminated stress-ng: debug: [3344] process [3347] terminated stress-ng: debug: [3344] process [3348] terminated stress-ng: debug: [3349] stress-ng-kill: exited [3349] (instance 4) stress-ng: debug: [3344] process [3349] terminated stress-ng: debug: [3350] stress-ng-kill: exited [3350] (instance 5) stress-ng: debug: [3344] process [3350] terminated stress-ng: info: [3344] successful run completed in 600.00s (10 mins, 0.00 secs) ubuntu@boomer:~$