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Created attachment 831337 [details] lspci -vvv -s 00:19.0 Description of problem: I'm not sure what is triggering the problem, but once in a while, when using Fedora (currently F20, but it has occured to me also in F18), my ethernet stops working. Dmesg / journalctl show there's an 'hardware error'. Additionally, as turning on debug in kernel for e1000e module shows, there's a problem with acquiring semaphore for that device, which results in high CPU usage by kernel threads like: ksoftirqd/n, watchdog/n, kworker/n:m Unloading / inserting e1000e module does not solve the issue. Bringing interface down causes the 'high CPU symptom' to disappear, but trying to bring interface up fails. Interface is not being shown by 'ip a s' at all. Reboot *DOES NOT* help. Booting older kernel does not help as well. However, the thing that fixes ethernet, is to boot some other OS (I'm using an ArchLinux installer ISO from USB stick). After going back to Fedora, eth is working correctly (interface is up and working, no error messages). Version-Release number of selected component (if applicable): 3.11.9-300.fc20.x86_64 (but also: kernel-3.11.8-300.fc20.x86_64) How reproducible: N/A Steps to Reproduce: 1. Use your ethernet (e1000e module) normally and wait for hardware errors in dmesg / journalctl, accompanied by high CPU usage by kernel threads. Additional info: My ethernet is: 00:19.0 Ethernet controller: Intel Corporation 82566MM Gigabit Network Connection (rev 03)
Created attachment 831339 [details] dmesg entries with e1000e debug enabled Dmesg is flooded with messages like the one in attachment when debugging for e1000e is enabled.
Created attachment 831340 [details] Errors for e1000e in dmesg This is what I can find in dmesg when ethernet is 'broken'.
Created attachment 831341 [details] ethtool output
Created attachment 831342 [details] Dmesg messages for e1000e when hardware is 'fixed' After I boot some other OS (Archlinux in this example), and then boot back into Fedora, no more error messages in dmesg - hardware initializes properly.
*********** MASS BUG UPDATE ************** We apologize for the inconvenience. There is a large number of bugs to go through and several of them have gone stale. Due to this, we are doing a mass bug update across all of the Fedora 20 kernel bugs. Fedora 20 has now been rebased to 3.13.4-200.fc20. Please test this kernel update and let us know if you issue has been resolved or if it is still present with the newer kernel. If you experience different issues, please open a new bug report for those.
*********** MASS BUG UPDATE ************** This bug has been in a needinfo state for several weeks and is being closed with insufficient data due to inactivity. If this is still an issue with Fedora 20, please feel free to reopen the bug and provide the additional information requested.