Until Kernel 3.14.6 I got those Error Messages every 5 minutes: Jun 21 15:31:23 localhost kernel: [Hardware Error]: MC2 Error: : EV error during data copyback. Jun 21 15:31:23 localhost kernel: [Hardware Error]: Error Status: Corrected error, no action required. Jun 21 15:31:23 localhost kernel: [Hardware Error]: CPU:0 (10:4:2) MC2_STATUS[Over|CE|-|-|AddrV]: 0xd40000000000017a Jun 21 15:31:23 localhost kernel: [Hardware Error]: MC2_ADDR: 0x00000000011c2d80 Jun 21 15:31:23 localhost kernel: [Hardware Error]: cache level: L2, tx: GEN, mem-tx: EV Jun 21 15:36:23 localhost kernel: [Hardware Error]: MC2 Error: : GEN parity/ECC error during data access from L2. Jun 21 15:36:23 localhost kernel: [Hardware Error]: Error Status: Corrected error, no action required. Jun 21 15:36:23 localhost kernel: [Hardware Error]: CPU:0 (10:4:2) MC2_STATUS[Over|CE|-|-|AddrV|CECC]: 0xd40041000000010a Jun 21 15:36:23 localhost kernel: [Hardware Error]: MC2_ADDR: 0x00000002fe700a40 Jun 21 15:36:23 localhost kernel: [Hardware Error]: cache level: L2, tx: GEN, mem-tx: GEN I have a AMD Phenom(tm) II X4 20 which basically is a AMD Phenom II x2 550 with two unlocked cored to become an AMD Phenom II x4 955. There might be some hardware error but it did not affect anything since over a year. When I installed kernel 3.15 those messages began to appear several times a second. The PC did not crash but su and sudo stopped working, shutdown did not work, I guess the erros flood blocks messages to the kernel or something. I got over 80000 lines of erros in 5 minutes. I guess some error reporting timedelay got changed which gaused the problem.
The is still in 3.15.2 The log shows over 60 errors per second(!) with some lost due to "/dev/kmsg buffer overrun, some messages lost."
Bug still present in 3.15.4 :(
I tried 3.16rc5 and is is still there... can someone please look into it? :/
You can just stop syslog daemon to not have it flooding your HDD with logs. But i suppose it is not the reason of su and sudo not working.
As it says "Hardware Error" : Your machine logged a corrected L2 cache error. Talk to your hardware vendor.
The hardware is not the problem, I got this error messages for a long time, there was a bug report here from someone else: https://bugzilla.kernel.org/show_bug.cgi?id=43205 The problem is, that the error message frequency changed from every 300s (which is fine) to several messages a second. And this is change occurred from 3.14 to 3.15.