Mark, I don't see any hardware errors on the Dell, as of yet, and I do plan to update the BIOS today. I'll go ahead and replace the cable, and ask the network guys to check the routers for any errors on the port. I did do some follow-up, and see that this problem persists across other platforms as well. Thanks for the follow-up

PEV

________________________________ From: mark m.roth@5-cent.us Sent: Monday, June 24, 2019 10:24 AM To: Virgo, Paul E. (GSFC-610.2)[ADNET SYSTEMS INC]; CentOS mailing list Subject: [EXTERNAL] Re: [CentOS] Strange Network Bug Locks Up CentOS 7 Laptop

Virgo, Paul E. (GSFC-610.2)[ADNET SYSTEMS INC] via CentOS wrote:

All,

I have a user who has a Dell Precision 7520 laptop, and we're running CentOS 7, latest kernel. This morning he had two lockup incidents. Nothing in /var/log/messages stands out so far, but did get this information when running 'abrt-cli list --since 1560891312':

id c48278a875c27dd4369d971bcfc7db4267766c6d reason: WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:356 dev_watchdog+0x248/0x260 time: Thu 23 May 2019 07:12:57 PM EDT cmdline: BOOT_IMAGE=/vmlinuz-3.10.0-957.12.1.el7.x86_64 root=/dev/mapper/SysVG00-ROOT ro crashkernel=auto rd.lvm.lv=SysVG00/ROOT rd.luks.uuid=luks-29590e52-c08e-4c11-a784-cf2f3ffd98b2 rd.lvm.lv=SysVG00/SWAP rhgb quiet LANG=en_US.UTF-8 package: kernel uid: 0 (root) count: 4 Directory: /var/spool/abrt/oops-2019-05-23-19:12:57-28561-0 Reported: cannot be reported

Has anyone seen this behavior before or this message? Seems like something related to network scheduling (?) or something. Any feedback would be appreciated. Thanks.

Hi, Paul,

I just searched on sch_generic.c:356, and found a number of things, intluding bugs from last year. I looked at the code - not sure if it's the same version, but it looks to me as though it may possibly be related to an issue with the network connection. If so, then it's check the cable, check the port on the router... or look for hardware errors on the laptop.

mark