Bug 1665789

Summary: There are "WARNING: CPU: 0 PID: 7 at kernel/hrtimer.c:1506 run_hrtimer_softirq+0x264/0x270" and "Call Trace" in rt kernel line
Product: Red Hat Enterprise Linux 7 Reporter: Pei Zhang <pezhang>
Component: kernel-rtAssignee: Kernel Drivers <hwkernel-mgr>
kernel-rt sub component: Other QA Contact: Qiao Zhao <qzhao>
Status: CLOSED DUPLICATE Docs Contact:
Severity: medium    
Priority: medium CC: bhu, chayang, juzhang, lcapitulino, lgoncalv, michen, williams
Version: 7.7   
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
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Clone Of: Environment:
Last Closed: 2019-01-14 12:34:04 UTC Type: Bug
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Pei Zhang 2019-01-14 02:59:34 UTC 
Description of problem:
Install a rhel7.7 RT-host(guest), there are Call Trace in kernel line. 


Version-Release number of selected component (if applicable):
3.10.0-990.rt56.945.el7.x86_64


How reproducible:
2/2


Steps to Reproduce:
1. Install a rhel7.7 host(guest)

2. Setup rt host(guest). 

After step2, check # dmesg, there are "Call Trace" in kernel line:

[    9.577346] ------------[ cut here ]------------
[    9.577352] WARNING: CPU: 0 PID: 7 at kernel/hrtimer.c:1506 run_hrtimer_softirq+0x264/0x270
[    9.577362] Modules linked in: ip_tables xfs libcrc32c virtio_net virtio_blk crct10dif_pclmul crct10dif_common crc32c_intel ahci serio_raw libahci libata virtio_pci dm_mirror dm_region_hash dm_log dm_mod
[    9.577364] CPU: 0 PID: 7 Comm: ktimersoftd/0 Not tainted 3.10.0-990.rt56.945.el7.x86_64 #1
[    9.577365] Hardware name: Red Hat KVM, BIOS 1.11.0-2.el7 04/01/2014
[    9.577366] Call Trace:
[    9.577373]  [<ffffffff8fd5942f>] dump_stack+0x19/0x1b
[    9.577377]  [<ffffffff8f68784b>] __warn+0xfb/0x120
[    9.577380]  [<ffffffff8f68798d>] warn_slowpath_null+0x1d/0x20
[    9.577382]  [<ffffffff8f6b8dd4>] run_hrtimer_softirq+0x264/0x270
[    9.577386]  [<ffffffff8f691922>] do_current_softirqs+0x1e2/0x410
[    9.577388]  [<ffffffff8f691c10>] run_ksoftirqd+0x30/0x50
[    9.577391]  [<ffffffff8f6bda0f>] smpboot_thread_fn+0x20f/0x2e0
[    9.577393]  [<ffffffff8f6bd800>] ? lg_local_unlock+0x20/0x20
[    9.577395]  [<ffffffff8f6b4551>] kthread+0xd1/0xe0
[    9.577397]  [<ffffffff8f6b4480>] ? kthread_worker_fn+0x170/0x170
[    9.577401]  [<ffffffff8fd6af37>] ret_from_fork_nospec_begin+0x21/0x21
[    9.577403]  [<ffffffff8f6b4480>] ? kthread_worker_fn+0x170/0x170
[    9.577404] ---[ end trace 0000000000000002 ]---


Actual results:
There is "Call Trace" in RT-host and RT-guest kernel line.

Expected results:
There should be no "Call Trace" in RT-host and RT-guest kernel line.

Additional info: