[Kernel-packages] [Bug 1486502] Re: Ubuntu15.10: KVM guest got hung (console) while running stress tool (stress tool with cpuhotplug)
** Tags removed: targetmilestone-inin1610 ** Tags added: targetmilestone-inin--- -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1486502 Title: Ubuntu15.10: KVM guest got hung (console) while running stress tool (stress tool with cpuhotplug) Status in linux package in Ubuntu: Invalid Bug description: Problem Description I installed Ubuntu15.10 having kernel 4.1.0-1-generic (kernel) on top of PowerKVM 3.1 host , I assigned 2 cpu to KVM guest and schedule stress test (cpu) for more than 10 hour. After ran the test it having call traces related to hung_task_timeout_secs And system got hung while running the tests . TEST was ran : 1-stress tool for 10 h stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 10h 2- cpu hotplug test (cpustress.sh) root@ubuntu:~/cpu_test# cat cpustress.sh #!/bin/bash var=$1 END=$1000 for ((j=1;j<=$END;j++)); do for ((i=0;i<=var;i++)); do echo $i test=`cat /sys/devices/system/cpu/cpu$i/online` if [ $test == 0 ] then echo 1 > /sys/devices/system/cpu/cpu$i/online else echo 0 > /sys/devices/system/cpu/cpu$i/online fi sleep 2 `cat /proc/cpuinfo > cpulog.text` done done root@ubuntu:~/cpu_test# ran parallel both test . LOG: root@ubuntu:~/cpu_test# [root@powerkvm5-lp1 ~]# root@ubuntu:~# cat /proc/cpuinfo processor : 0 cpu : POWER8E (raw), altivec supported clock : 4157.00MHz revision : 2.1 (pvr 004b 0201) processor : 2 cpu : POWER8E (raw), altivec supported clock : 4157.00MHz revision : 2.1 (pvr 004b 0201) timebase : 51200 platform : pSeries model : IBM pSeries (emulated by qemu) machine : CHRP IBM pSeries (emulated by qemu) root@ubuntu:~# cat /var/log/syslog [ 4440.010656] [c0007700fe30] [c0009560] ret_from_kernel_thread+0x5c/0x7c [ 4440.010758] INFO: task stress:670 blocked for more than 120 seconds. [ 4440.010795] Tainted: GWL 4.1.0-1-generic #7-Ubuntu [ 4440.010831] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 4440.010874] stress D 3fffa367d488 0 670668 0x0004 [ 4440.010876] Call Trace: [ 4440.010877] [c0007514f800] [c0007514f850] 0xc0007514f850 (unreliable) [ 4440.010879] [c0007514f9d0] [c00157cc] __switch_to+0x1fc/0x350 [ 4440.010880] [c0007514fa20] [c0a3f2a0] __schedule+0x350/0x8a0 [ 4440.010882] [c0007514faa0] [c0a3f834] schedule+0x44/0xc0 [ 4440.010883] [c0007514fad0] [c0a438d4] schedule_timeout+0x254/0x2f0 [ 4440.010885] [c0007514fbc0] [c0a4085c] wait_for_common+0xec/0x240 [ 4440.010892] [c0007514fc40] [c04d4cc4] submit_bio_wait+0x84/0xb0 [ 4440.010894] [c0007514fcb0] [c04e6e08] blkdev_issue_flush+0x88/0xe0 [ 4440.010896] [c0007514fcf0] [c0394e0c] ext4_sync_fs+0x1ac/0x280 [ 4440.010898] [c0007514fd50] [c02fc1c0] sync_fs_one_sb+0x60/0x80 [ 4440.010900] [c0007514fd80] [c02ba768] iterate_supers+0x1b8/0x200 [ 4440.010902] [c0007514fdf0] [c02fc368] sys_sync+0x78/0xf0 [ 4440.010904] [c0007514fe30] [c0009258] system_call+0x38/0xd0 [ 4440.010905] INFO: task stress:673 blocked for more than 120 seconds. [ 4440.010941] Tainted: GWL 4.1.0-1-generic #7-Ubuntu [ 4440.010977] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 4440.011020] stress D 3fffa367d488 0 673668 0x0004 [ 4440.011022] Call Trace: [ 4440.011024] [c0007516b800] [c0007516b890] 0xc0007516b890 (unreliable) [ 4440.011025] [c0007516b9d0] [c00157cc] __switch_to+0x1fc/0x350 [ 4440.011027] [c0007516ba20] [c0a3f2a0] __schedule+0x350/0x8a0 [ 4440.011028] [c0007516baa0] [c0a3f834] schedule+0x44/0xc0 [ 4440.011030] [c0007516bad0] [c0a438d4] schedule_timeout+0x254/0x2f0 [ 4440.011031] [c0007516bbc0] [c0a4085c] wait_for_common+0xec/0x240 [ 4440.011033] [c0007516bc40] [c04d4cc4] submit_bio_wait+0x84/0xb0 [ 4440.011034] [c0007516bcb0] [c04e6e08] blkdev_issue_flush+0x88/0xe0 [ 4440.011036] [c0007516bcf0] [c0394e0c] ext4_sync_fs+0x1ac/0x280 [ 4440.011037] [c0007516bd50] [c02fc1c0] sync_fs_one_sb+0x60/0x80 [ 4440.011039] [c0007516bd80] [c02ba768] iterate_supers+0x1b8/0x200 [ 4440.011040] [c0007516bdf0] [c02fc368] sys_sync+0x78/0xf0 [ 4440.011042] [c00075
[Kernel-packages] [Bug 1486502] Re: Ubuntu15.10: KVM guest got hung (console) while running stress tool (stress tool with cpuhotplug)
** Changed in: linux (Ubuntu) Assignee: Taco Screen team (taco-screen-team) => (unassigned) ** Changed in: linux (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1486502 Title: Ubuntu15.10: KVM guest got hung (console) while running stress tool (stress tool with cpuhotplug) Status in linux package in Ubuntu: Invalid Bug description: Problem Description I installed Ubuntu15.10 having kernel 4.1.0-1-generic (kernel) on top of PowerKVM 3.1 host , I assigned 2 cpu to KVM guest and schedule stress test (cpu) for more than 10 hour. After ran the test it having call traces related to hung_task_timeout_secs And system got hung while running the tests . TEST was ran : 1-stress tool for 10 h stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 10h 2- cpu hotplug test (cpustress.sh) root@ubuntu:~/cpu_test# cat cpustress.sh #!/bin/bash var=$1 END=$1000 for ((j=1;j<=$END;j++)); do for ((i=0;i<=var;i++)); do echo $i test=`cat /sys/devices/system/cpu/cpu$i/online` if [ $test == 0 ] then echo 1 > /sys/devices/system/cpu/cpu$i/online else echo 0 > /sys/devices/system/cpu/cpu$i/online fi sleep 2 `cat /proc/cpuinfo > cpulog.text` done done root@ubuntu:~/cpu_test# ran parallel both test . LOG: root@ubuntu:~/cpu_test# [root@powerkvm5-lp1 ~]# root@ubuntu:~# cat /proc/cpuinfo processor : 0 cpu : POWER8E (raw), altivec supported clock : 4157.00MHz revision : 2.1 (pvr 004b 0201) processor : 2 cpu : POWER8E (raw), altivec supported clock : 4157.00MHz revision : 2.1 (pvr 004b 0201) timebase : 51200 platform : pSeries model : IBM pSeries (emulated by qemu) machine : CHRP IBM pSeries (emulated by qemu) root@ubuntu:~# cat /var/log/syslog [ 4440.010656] [c0007700fe30] [c0009560] ret_from_kernel_thread+0x5c/0x7c [ 4440.010758] INFO: task stress:670 blocked for more than 120 seconds. [ 4440.010795] Tainted: GWL 4.1.0-1-generic #7-Ubuntu [ 4440.010831] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 4440.010874] stress D 3fffa367d488 0 670668 0x0004 [ 4440.010876] Call Trace: [ 4440.010877] [c0007514f800] [c0007514f850] 0xc0007514f850 (unreliable) [ 4440.010879] [c0007514f9d0] [c00157cc] __switch_to+0x1fc/0x350 [ 4440.010880] [c0007514fa20] [c0a3f2a0] __schedule+0x350/0x8a0 [ 4440.010882] [c0007514faa0] [c0a3f834] schedule+0x44/0xc0 [ 4440.010883] [c0007514fad0] [c0a438d4] schedule_timeout+0x254/0x2f0 [ 4440.010885] [c0007514fbc0] [c0a4085c] wait_for_common+0xec/0x240 [ 4440.010892] [c0007514fc40] [c04d4cc4] submit_bio_wait+0x84/0xb0 [ 4440.010894] [c0007514fcb0] [c04e6e08] blkdev_issue_flush+0x88/0xe0 [ 4440.010896] [c0007514fcf0] [c0394e0c] ext4_sync_fs+0x1ac/0x280 [ 4440.010898] [c0007514fd50] [c02fc1c0] sync_fs_one_sb+0x60/0x80 [ 4440.010900] [c0007514fd80] [c02ba768] iterate_supers+0x1b8/0x200 [ 4440.010902] [c0007514fdf0] [c02fc368] sys_sync+0x78/0xf0 [ 4440.010904] [c0007514fe30] [c0009258] system_call+0x38/0xd0 [ 4440.010905] INFO: task stress:673 blocked for more than 120 seconds. [ 4440.010941] Tainted: GWL 4.1.0-1-generic #7-Ubuntu [ 4440.010977] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 4440.011020] stress D 3fffa367d488 0 673668 0x0004 [ 4440.011022] Call Trace: [ 4440.011024] [c0007516b800] [c0007516b890] 0xc0007516b890 (unreliable) [ 4440.011025] [c0007516b9d0] [c00157cc] __switch_to+0x1fc/0x350 [ 4440.011027] [c0007516ba20] [c0a3f2a0] __schedule+0x350/0x8a0 [ 4440.011028] [c0007516baa0] [c0a3f834] schedule+0x44/0xc0 [ 4440.011030] [c0007516bad0] [c0a438d4] schedule_timeout+0x254/0x2f0 [ 4440.011031] [c0007516bbc0] [c0a4085c] wait_for_common+0xec/0x240 [ 4440.011033] [c0007516bc40] [c04d4cc4] submit_bio_wait+0x84/0xb0 [ 4440.011034] [c0007516bcb0] [c04e6e08] blkdev_issue_flush+0x88/0xe0 [ 4440.011036] [c0007516bcf0] [c0394e0c] ext4_sync_fs+0x1ac/0x280 [ 4440.011037] [c0007516bd50] [c02fc1c0] sync_fs_one_sb+0x60/0x80 [ 4440.011039] [c0007516bd80] [c02ba768] iterate_supers+0x1b8/0x200 [ 4440.011040] [c00
[Kernel-packages] [Bug 1486502] Re: Ubuntu15.10: KVM guest got hung (console) while running stress tool (stress tool with cpuhotplug)
** Changed in: linux (Ubuntu) Assignee: (unassigned) => Taco Screen team (taco-screen-team) ** Tags removed: targetmilestone-inin1510 ** Tags added: targetmilestone-inin1610 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1486502 Title: Ubuntu15.10: KVM guest got hung (console) while running stress tool (stress tool with cpuhotplug) Status in linux package in Ubuntu: New Bug description: Problem Description I installed Ubuntu15.10 having kernel 4.1.0-1-generic (kernel) on top of PowerKVM 3.1 host , I assigned 2 cpu to KVM guest and schedule stress test (cpu) for more than 10 hour. After ran the test it having call traces related to hung_task_timeout_secs And system got hung while running the tests . TEST was ran : 1-stress tool for 10 h stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 10h 2- cpu hotplug test (cpustress.sh) root@ubuntu:~/cpu_test# cat cpustress.sh #!/bin/bash var=$1 END=$1000 for ((j=1;j<=$END;j++)); do for ((i=0;i<=var;i++)); do echo $i test=`cat /sys/devices/system/cpu/cpu$i/online` if [ $test == 0 ] then echo 1 > /sys/devices/system/cpu/cpu$i/online else echo 0 > /sys/devices/system/cpu/cpu$i/online fi sleep 2 `cat /proc/cpuinfo > cpulog.text` done done root@ubuntu:~/cpu_test# ran parallel both test . LOG: root@ubuntu:~/cpu_test# [root@powerkvm5-lp1 ~]# root@ubuntu:~# cat /proc/cpuinfo processor : 0 cpu : POWER8E (raw), altivec supported clock : 4157.00MHz revision : 2.1 (pvr 004b 0201) processor : 2 cpu : POWER8E (raw), altivec supported clock : 4157.00MHz revision : 2.1 (pvr 004b 0201) timebase : 51200 platform : pSeries model : IBM pSeries (emulated by qemu) machine : CHRP IBM pSeries (emulated by qemu) root@ubuntu:~# cat /var/log/syslog [ 4440.010656] [c0007700fe30] [c0009560] ret_from_kernel_thread+0x5c/0x7c [ 4440.010758] INFO: task stress:670 blocked for more than 120 seconds. [ 4440.010795] Tainted: GWL 4.1.0-1-generic #7-Ubuntu [ 4440.010831] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 4440.010874] stress D 3fffa367d488 0 670668 0x0004 [ 4440.010876] Call Trace: [ 4440.010877] [c0007514f800] [c0007514f850] 0xc0007514f850 (unreliable) [ 4440.010879] [c0007514f9d0] [c00157cc] __switch_to+0x1fc/0x350 [ 4440.010880] [c0007514fa20] [c0a3f2a0] __schedule+0x350/0x8a0 [ 4440.010882] [c0007514faa0] [c0a3f834] schedule+0x44/0xc0 [ 4440.010883] [c0007514fad0] [c0a438d4] schedule_timeout+0x254/0x2f0 [ 4440.010885] [c0007514fbc0] [c0a4085c] wait_for_common+0xec/0x240 [ 4440.010892] [c0007514fc40] [c04d4cc4] submit_bio_wait+0x84/0xb0 [ 4440.010894] [c0007514fcb0] [c04e6e08] blkdev_issue_flush+0x88/0xe0 [ 4440.010896] [c0007514fcf0] [c0394e0c] ext4_sync_fs+0x1ac/0x280 [ 4440.010898] [c0007514fd50] [c02fc1c0] sync_fs_one_sb+0x60/0x80 [ 4440.010900] [c0007514fd80] [c02ba768] iterate_supers+0x1b8/0x200 [ 4440.010902] [c0007514fdf0] [c02fc368] sys_sync+0x78/0xf0 [ 4440.010904] [c0007514fe30] [c0009258] system_call+0x38/0xd0 [ 4440.010905] INFO: task stress:673 blocked for more than 120 seconds. [ 4440.010941] Tainted: GWL 4.1.0-1-generic #7-Ubuntu [ 4440.010977] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 4440.011020] stress D 3fffa367d488 0 673668 0x0004 [ 4440.011022] Call Trace: [ 4440.011024] [c0007516b800] [c0007516b890] 0xc0007516b890 (unreliable) [ 4440.011025] [c0007516b9d0] [c00157cc] __switch_to+0x1fc/0x350 [ 4440.011027] [c0007516ba20] [c0a3f2a0] __schedule+0x350/0x8a0 [ 4440.011028] [c0007516baa0] [c0a3f834] schedule+0x44/0xc0 [ 4440.011030] [c0007516bad0] [c0a438d4] schedule_timeout+0x254/0x2f0 [ 4440.011031] [c0007516bbc0] [c0a4085c] wait_for_common+0xec/0x240 [ 4440.011033] [c0007516bc40] [c04d4cc4] submit_bio_wait+0x84/0xb0 [ 4440.011034] [c0007516bcb0] [c04e6e08] blkdev_issue_flush+0x88/0xe0 [ 4440.011036] [c0007516bcf0] [c0394e0c] ext4_sync_fs+0x1ac/0x280 [ 4440.011037] [c0007516bd50] [c02fc1c0] sync_fs_one_sb+0x60/0x80 [ 4440.011039] [c0007516bd80] [c02ba768] iterate_supers+0x1b8/0x200 [ 444
[Kernel-packages] [Bug 1486502] Re: Ubuntu15.10: KVM guest got hung (console) while running stress tool (stress tool with cpuhotplug)
** Tags removed: targetmilestone-inin--- ** Tags added: targetmilestone-inin1510 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1486502 Title: Ubuntu15.10: KVM guest got hung (console) while running stress tool (stress tool with cpuhotplug) Status in linux package in Ubuntu: New Bug description: Problem Description I installed Ubuntu15.10 having kernel 4.1.0-1-generic (kernel) on top of PowerKVM 3.1 host , I assigned 2 cpu to KVM guest and schedule stress test (cpu) for more than 10 hour. After ran the test it having call traces related to hung_task_timeout_secs And system got hung while running the tests . TEST was ran : 1-stress tool for 10 h stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 10h 2- cpu hotplug test (cpustress.sh) root@ubuntu:~/cpu_test# cat cpustress.sh #!/bin/bash var=$1 END=$1000 for ((j=1;j<=$END;j++)); do for ((i=0;i<=var;i++)); do echo $i test=`cat /sys/devices/system/cpu/cpu$i/online` if [ $test == 0 ] then echo 1 > /sys/devices/system/cpu/cpu$i/online else echo 0 > /sys/devices/system/cpu/cpu$i/online fi sleep 2 `cat /proc/cpuinfo > cpulog.text` done done root@ubuntu:~/cpu_test# ran parallel both test . LOG: root@ubuntu:~/cpu_test# [root@powerkvm5-lp1 ~]# root@ubuntu:~# cat /proc/cpuinfo processor : 0 cpu : POWER8E (raw), altivec supported clock : 4157.00MHz revision : 2.1 (pvr 004b 0201) processor : 2 cpu : POWER8E (raw), altivec supported clock : 4157.00MHz revision : 2.1 (pvr 004b 0201) timebase : 51200 platform : pSeries model : IBM pSeries (emulated by qemu) machine : CHRP IBM pSeries (emulated by qemu) root@ubuntu:~# cat /var/log/syslog [ 4440.010656] [c0007700fe30] [c0009560] ret_from_kernel_thread+0x5c/0x7c [ 4440.010758] INFO: task stress:670 blocked for more than 120 seconds. [ 4440.010795] Tainted: GWL 4.1.0-1-generic #7-Ubuntu [ 4440.010831] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 4440.010874] stress D 3fffa367d488 0 670668 0x0004 [ 4440.010876] Call Trace: [ 4440.010877] [c0007514f800] [c0007514f850] 0xc0007514f850 (unreliable) [ 4440.010879] [c0007514f9d0] [c00157cc] __switch_to+0x1fc/0x350 [ 4440.010880] [c0007514fa20] [c0a3f2a0] __schedule+0x350/0x8a0 [ 4440.010882] [c0007514faa0] [c0a3f834] schedule+0x44/0xc0 [ 4440.010883] [c0007514fad0] [c0a438d4] schedule_timeout+0x254/0x2f0 [ 4440.010885] [c0007514fbc0] [c0a4085c] wait_for_common+0xec/0x240 [ 4440.010892] [c0007514fc40] [c04d4cc4] submit_bio_wait+0x84/0xb0 [ 4440.010894] [c0007514fcb0] [c04e6e08] blkdev_issue_flush+0x88/0xe0 [ 4440.010896] [c0007514fcf0] [c0394e0c] ext4_sync_fs+0x1ac/0x280 [ 4440.010898] [c0007514fd50] [c02fc1c0] sync_fs_one_sb+0x60/0x80 [ 4440.010900] [c0007514fd80] [c02ba768] iterate_supers+0x1b8/0x200 [ 4440.010902] [c0007514fdf0] [c02fc368] sys_sync+0x78/0xf0 [ 4440.010904] [c0007514fe30] [c0009258] system_call+0x38/0xd0 [ 4440.010905] INFO: task stress:673 blocked for more than 120 seconds. [ 4440.010941] Tainted: GWL 4.1.0-1-generic #7-Ubuntu [ 4440.010977] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 4440.011020] stress D 3fffa367d488 0 673668 0x0004 [ 4440.011022] Call Trace: [ 4440.011024] [c0007516b800] [c0007516b890] 0xc0007516b890 (unreliable) [ 4440.011025] [c0007516b9d0] [c00157cc] __switch_to+0x1fc/0x350 [ 4440.011027] [c0007516ba20] [c0a3f2a0] __schedule+0x350/0x8a0 [ 4440.011028] [c0007516baa0] [c0a3f834] schedule+0x44/0xc0 [ 4440.011030] [c0007516bad0] [c0a438d4] schedule_timeout+0x254/0x2f0 [ 4440.011031] [c0007516bbc0] [c0a4085c] wait_for_common+0xec/0x240 [ 4440.011033] [c0007516bc40] [c04d4cc4] submit_bio_wait+0x84/0xb0 [ 4440.011034] [c0007516bcb0] [c04e6e08] blkdev_issue_flush+0x88/0xe0 [ 4440.011036] [c0007516bcf0] [c0394e0c] ext4_sync_fs+0x1ac/0x280 [ 4440.011037] [c0007516bd50] [c02fc1c0] sync_fs_one_sb+0x60/0x80 [ 4440.011039] [c0007516bd80] [c02ba768] iterate_supers+0x1b8/0x200 [ 4440.011040] [c0007516bdf0] [c02fc368] sys_sync+0x78/0xf0 [ 4440.011042] [c0007516be
[Kernel-packages] [Bug 1486502] Re: Ubuntu15.10: KVM guest got hung (console) while running stress tool (stress tool with cpuhotplug)
** Package changed: ubuntu => linux (Ubuntu) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1486502 Title: Ubuntu15.10: KVM guest got hung (console) while running stress tool (stress tool with cpuhotplug) Status in linux package in Ubuntu: New Bug description: Problem Description I installed Ubuntu15.10 having kernel 4.1.0-1-generic (kernel) on top of PowerKVM 3.1 host , I assigned 2 cpu to KVM guest and schedule stress test (cpu) for more than 10 hour. After ran the test it having call traces related to hung_task_timeout_secs And system got hung while running the tests . TEST was ran : 1-stress tool for 10 h stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 10h 2- cpu hotplug test (cpustress.sh) root@ubuntu:~/cpu_test# cat cpustress.sh #!/bin/bash var=$1 END=$1000 for ((j=1;j<=$END;j++)); do for ((i=0;i<=var;i++)); do echo $i test=`cat /sys/devices/system/cpu/cpu$i/online` if [ $test == 0 ] then echo 1 > /sys/devices/system/cpu/cpu$i/online else echo 0 > /sys/devices/system/cpu/cpu$i/online fi sleep 2 `cat /proc/cpuinfo > cpulog.text` done done root@ubuntu:~/cpu_test# ran parallel both test . LOG: root@ubuntu:~/cpu_test# [root@powerkvm5-lp1 ~]# root@ubuntu:~# cat /proc/cpuinfo processor : 0 cpu : POWER8E (raw), altivec supported clock : 4157.00MHz revision : 2.1 (pvr 004b 0201) processor : 2 cpu : POWER8E (raw), altivec supported clock : 4157.00MHz revision : 2.1 (pvr 004b 0201) timebase : 51200 platform : pSeries model : IBM pSeries (emulated by qemu) machine : CHRP IBM pSeries (emulated by qemu) root@ubuntu:~# cat /var/log/syslog [ 4440.010656] [c0007700fe30] [c0009560] ret_from_kernel_thread+0x5c/0x7c [ 4440.010758] INFO: task stress:670 blocked for more than 120 seconds. [ 4440.010795] Tainted: GWL 4.1.0-1-generic #7-Ubuntu [ 4440.010831] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 4440.010874] stress D 3fffa367d488 0 670668 0x0004 [ 4440.010876] Call Trace: [ 4440.010877] [c0007514f800] [c0007514f850] 0xc0007514f850 (unreliable) [ 4440.010879] [c0007514f9d0] [c00157cc] __switch_to+0x1fc/0x350 [ 4440.010880] [c0007514fa20] [c0a3f2a0] __schedule+0x350/0x8a0 [ 4440.010882] [c0007514faa0] [c0a3f834] schedule+0x44/0xc0 [ 4440.010883] [c0007514fad0] [c0a438d4] schedule_timeout+0x254/0x2f0 [ 4440.010885] [c0007514fbc0] [c0a4085c] wait_for_common+0xec/0x240 [ 4440.010892] [c0007514fc40] [c04d4cc4] submit_bio_wait+0x84/0xb0 [ 4440.010894] [c0007514fcb0] [c04e6e08] blkdev_issue_flush+0x88/0xe0 [ 4440.010896] [c0007514fcf0] [c0394e0c] ext4_sync_fs+0x1ac/0x280 [ 4440.010898] [c0007514fd50] [c02fc1c0] sync_fs_one_sb+0x60/0x80 [ 4440.010900] [c0007514fd80] [c02ba768] iterate_supers+0x1b8/0x200 [ 4440.010902] [c0007514fdf0] [c02fc368] sys_sync+0x78/0xf0 [ 4440.010904] [c0007514fe30] [c0009258] system_call+0x38/0xd0 [ 4440.010905] INFO: task stress:673 blocked for more than 120 seconds. [ 4440.010941] Tainted: GWL 4.1.0-1-generic #7-Ubuntu [ 4440.010977] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 4440.011020] stress D 3fffa367d488 0 673668 0x0004 [ 4440.011022] Call Trace: [ 4440.011024] [c0007516b800] [c0007516b890] 0xc0007516b890 (unreliable) [ 4440.011025] [c0007516b9d0] [c00157cc] __switch_to+0x1fc/0x350 [ 4440.011027] [c0007516ba20] [c0a3f2a0] __schedule+0x350/0x8a0 [ 4440.011028] [c0007516baa0] [c0a3f834] schedule+0x44/0xc0 [ 4440.011030] [c0007516bad0] [c0a438d4] schedule_timeout+0x254/0x2f0 [ 4440.011031] [c0007516bbc0] [c0a4085c] wait_for_common+0xec/0x240 [ 4440.011033] [c0007516bc40] [c04d4cc4] submit_bio_wait+0x84/0xb0 [ 4440.011034] [c0007516bcb0] [c04e6e08] blkdev_issue_flush+0x88/0xe0 [ 4440.011036] [c0007516bcf0] [c0394e0c] ext4_sync_fs+0x1ac/0x280 [ 4440.011037] [c0007516bd50] [c02fc1c0] sync_fs_one_sb+0x60/0x80 [ 4440.011039] [c0007516bd80] [c02ba768] iterate_supers+0x1b8/0x200 [ 4440.011040] [c0007516bdf0] [c02fc368] sys_sync+0x78/0xf0 [ 4440.011042] [c0007516be30] [c0009258] system_call+0
