Hello list, On my most recent update, I had some build failures that led me to find that some files on my root partition have been corrupted. This is a new Asus N550JK laptop, a mostly-stable amd64 install with gentoo-sources-4.0.5 and ext4-root-in-LVM-in-LUKS-on-HDD, and Debian lives in there too (no problems showed up verifying Debian's packages; I installed Debian on Jul 1 and used it for a week before getting time to set up Gentoo). These are the package merge times, package names, and files that I found to be corrupted via qcheck (there were also a couple Python headers that I fixed by rebuilding). They appear to be filled with random data. The binpkg contents in /usr/portage/packages are okay, so I don't know when the files were corrupted; their mtimes haven't been updated since the packages were installed. Thu-Jul-30-22:40:23-2015 app-arch/p7zip-9.20.1-r5 /usr/lib64/p7zip/Lang/va.txt Thu-Jul-30-22:40:23-2015 app-arch/p7zip-9.20.1-r5 /usr/lib64/p7zip/help/cmdline/switches/large_pages.htm Sun-Jul-19-22:34:30-2015 dev-libs/libzip-1.0.1 /usr/share/man/man3/zip_error_get_sys_type.3.bz2 Sun-Jul-26-22:35:28-2015 dev-python/pygments-2.0.1-r1 /usr/lib64/python2.7/site-packages/pygments/styles/pastie.pyc Wed-Jul-08-23:34:56-2015 media-libs/tiff-4.0.3-r6 /usr/share/man/man3/TIFFGetField.3tiff.bz2 Thu-Jul-30-10:05:31-2015 sci-mathematics/scilab-5.5.2 /usr/share/scilab/modules/compatibility_functions/macros/%b_l_s.bin -(from-stage3-on-Jul-8)- sys-apps/acl-2.2.52-r1 /usr/share/man/man3/acl_set_file.3.bz2 I haven't had any unclean shutdowns, it looks like OpenRC is unmounting things cleanly on shutdown, and suspend appears to work fine. After I make a fresh backup of my files, how would you recommend troubleshooting this? Run memtest or a hard drive tester? Since the files seemingly corrupted themselves after install without being touched, I'm highly suspicious of the hard drive, but would like to rule other things out (if say for example that CONFIG_X86_INTEL_PSTATE CPU clock booster is dangerous, or nvidia-drivers, or ...). Haven't checked for corruption on /home yet. This is the disk: *-disk description: ATA Disk product: ST1000LM024 HN-M vendor: Seagate physical id: 0.0.0 bus info: scsi@4:0.0.0 logical name: /dev/sda version: 0001 size: 931GiB (1TB) capabilities: gpt-1.00 partitioned partitioned:gpt configuration: ansiversion=5 guid=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx sectorsize=4096 Thanks for any help you can provide, Bryan