Hung task panic with nohz_full options specified on kernel line

Solution In Progress - Updated -

Issue

  • Tasks and I/O hanging causing hung task timeout breach
crash> sys | grep PANIC
       PANIC: "Kernel panic - not syncing: hung_task: blocked tasks"
[ 1922.725519] Kernel panic - not syncing: hung_task: blocked tasks
[ 1922.725541] CPU: 43 PID: 362 Comm: khungtaskd Tainted: G        W      ------------   3.10.0-327.18.2.el7.x86_64 #1
[ 1922.725572] Hardware name: Cisco Systems Inc UCSC-C240-M4SX/UCSC-C240-M4SX, BIOS C240M4.2.0.10e.0.0620162114 06/20/2016
[ 1922.725602]  ffffffff81871a08 000000005341a322 ffff881fcfd7fde0 ffffffff816359e4
[ 1922.725634]  ffff881fcfd7fe60 ffffffff8162f25a 0000003d00000008 ffff881fcfd7fe70
[ 1922.725660]  ffff881fcfd7fe10 000000005341a322 0000000000002710 0000000000000038
[ 1922.725688] Call Trace:
[ 1922.725716]  [<ffffffff816359e4>] dump_stack+0x19/0x1b
[ 1922.725734]  [<ffffffff8162f25a>] panic+0xd8/0x1e7
[ 1922.725753]  [<ffffffff8111b01e>] watchdog+0x27e/0x290
[ 1922.725772]  [<ffffffff8111ada0>] ? reset_hung_task_detector+0x20/0x20
[ 1922.725796]  [<ffffffff810a5acf>] kthread+0xcf/0xe0
[ 1922.725814]  [<ffffffff810a5a00>] ? kthread_create_on_node+0x140/0x140
[ 1922.725835]  [<ffffffff816460d8>] ret_from_fork+0x58/0x90
[ 1922.725854]  [<ffffffff810a5a00>] ? kthread_create_on_node+0x140/0x140


  • Kernel line has nohz_full options specified
nohz=on nohz_full=1,2,3,4,5,6,7,8,9,10,11,12,13,15,16,17,18,19,20,21,22,23,24,25,26,27,29...

Environment

  • Red Hat Enterprise Linux 7
  • kernel-3.10.0-327.18.2.el7

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