Multiple serial console write request cause a system hang.

Solution In Progress - Updated -

Issue

  • OpenShift environment with frequent console logging causes a system to hang with following messages.
[1208442.206779] INFO: rcu_sched detected stalls on CPUs/tasks: { 50} (detected by 30, t=137943826 jiffies, g=66713263, c=66713262, q=137047450)
[1208442.206780] Task dump for CPU 50:
[1208442.206783] migration/50    R  running task        0   260      2 0x00000088
[1208442.206784] Call Trace:
[1208442.206787]  [<ffffffff99b139bc>] ? __schedule+0x41c/0xa20
[1208442.206789]  [<ffffffff994c3dd4>] ? smpboot_thread_fn+0x144/0x1a0
[1208442.206790]  [<ffffffff994c3c90>] ? lg_double_unlock+0x40/0x40
[1208442.206802]  [<ffffffff994bb621>] ? kthread+0xd1/0xe0
[1208442.206804]  [<ffffffff994bb550>] ? insert_kthread_work+0x40/0x40
[1208442.206806]  [<ffffffff99b205f7>] ? ret_from_fork_nospec_begin+0x21/0x21
[1208442.206807]  [<ffffffff994bb550>] ? insert_kthread_work+0x40/0x40

Environment

  • Red Hat Enterprise Linux 7
  • kernel-3.10.0-862.6.3.el7.x86_64
  • Docker

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content