So... the error happened :( I don't know if it's related but I was compiling QT 5 inside a virtual machine and gone to sleep. When I woke up there was an error in the compilation about not being able to allocate virtual memory. The vm was unusable (I pressed things and they won't work) then I rebooted the VM and in the ubuntu initialization there was something about trying to write outside disk hd1. I did fsck then and the machine kept printing lots of lines indefintely about disk writes (wouldn't stop). Tried to print but couldn't save. Now, in the main machine, I did touch a and the error Read Only filesystem appeared. Then looks at dmesg: [62526.097648] CPU3: Package temperature above threshold, cpu clock throttled (total events = 734393) [62526.097650] CPU2: Package temperature above threshold, cpu clock throttled (total events = 734389) [62526.097654] CPU0: Package temperature above threshold, cpu clock throttled (total events = 734421) [62526.098643] CPU0: Core temperature/speed normal [62526.098644] CPU2: Core temperature/speed normal [62526.098644] CPU3: Package temperature/speed normal [62526.098645] CPU1: Package temperature/speed normal [62526.098646] CPU2: Package temperature/speed normal [62526.098647] CPU0: Package temperature/speed normal [62826.083664] CPU0: Core temperature/speed normal [62826.083665] CPU2: Core temperature/speed normal [62826.083666] CPU3: Package temperature/speed normal [62826.083667] CPU1: Package temperature/speed normal [62826.083667] CPU2: Package temperature/speed normal [62826.083669] CPU0: Package temperature/speed normal [63109.039660] CPU3: Core temperature above threshold, cpu clock throttled (total events = 122579) [63109.039661] CPU1: Core temperature above threshold, cpu clock throttled (total events = 122586) [63109.043637] CPU3: Core temperature/speed normal [63109.043637] CPU1: Core temperature/speed normal [63141.298625] CPU2: Core temperature above threshold, cpu clock throttled (total events = 685839) [63141.298626] CPU0: Core temperature above threshold, cpu clock throttled (total events = 685861) [63141.298628] CPU1: Package temperature above threshold, cpu clock throttled (total events = 752070) [63141.298628] CPU3: Package temperature above threshold, cpu clock throttled (total events = 752043) [63141.298630] CPU0: Package temperature above threshold, cpu clock throttled (total events = 752073) [63141.298633] CPU2: Package temperature above threshold, cpu clock throttled (total events = 752042) [63141.311665] CPU0: Core temperature/speed normal [63141.311666] CPU2: Core temperature/speed normal [63141.311667] CPU1: Package temperature/speed normal [63141.311667] CPU3: Package temperature/speed normal [63141.311668] CPU2: Package temperature/speed normal [63141.311669] CPU0: Package temperature/speed normal [63441.300764] CPU2: Core temperature/speed normal [63441.300765] CPU0: Core temperature/speed normal [63441.300766] CPU3: Package temperature/speed normal [63441.300766] CPU1: Package temperature/speed normal [63441.300767] CPU0: Package temperature/speed normal [63441.300768] CPU2: Package temperature/speed normal [63742.088404] CPU0: Core temperature above threshold, cpu clock throttled (total events = 702907) [63742.088405] CPU1: Package temperature above threshold, cpu clock throttled (total events = 773051) [63742.088406] CPU3: Package temperature above threshold, cpu clock throttled (total events = 773025) [63742.088407] CPU2: Core temperature above threshold, cpu clock throttled (total events = 702884) [63742.088408] CPU2: Package temperature above threshold, cpu clock throttled (total events = 773023) [63742.088412] CPU0: Package temperature above threshold, cpu clock throttled (total events = 773055) [63742.089411] CPU2: Core temperature/speed normal [63742.089412] CPU0: Core temperature/speed normal [63742.089412] CPU3: Package temperature/speed normal [63742.089413] CPU1: Package temperature/speed normal [63742.089413] CPU0: Package temperature/speed normal [63742.089414] CPU2: Package temperature/speed normal [64044.223423] CPU0: Core temperature above threshold, cpu clock throttled (total events = 712002) [64044.223424] CPU2: Core temperature above threshold, cpu clock throttled (total events = 711979) [64044.223425] CPU1: Package temperature above threshold, cpu clock throttled (total events = 783486) [64044.223426] CPU3: Package temperature above threshold, cpu clock throttled (total events = 783460) [64044.223428] CPU2: Package temperature above threshold, cpu clock throttled (total events = 783459) [64044.223431] CPU0: Package temperature above threshold, cpu clock throttled (total events = 783491) [64044.235444] CPU2: Core temperature/speed normal [64044.235444] CPU3: Package temperature/speed normal [64044.235445] CPU1: Package temperature/speed normal [64044.235446] CPU0: Core temperature/speed normal [64044.235447] CPU0: Package temperature/speed normal [64044.235448] CPU2: Package temperature/speed normal [68668.590466] EXT4-fs error (device nvme0n1p2): ext4_find_entry:1447: inode #26479617: comm updatedb.mlocat: checksumming directory block 0 [68668.592440] Aborting journal on device nvme0n1p2-8. [68668.595459] EXT4-fs (nvme0n1p2): Remounting filesystem read-only [68668.595466] EXT4-fs error (device nvme0n1p2): ext4_journal_check_start:61: Detected aborted journal [68668.595469] EXT4-fs error (device nvme0n1p2): ext4_find_entry:1447: inode #26479617: comm updatedb.mlocat: checksumming directory block 0 [68668.597557] EXT4-fs error (device nvme0n1p2): ext4_find_entry:1447: inode #26479617: comm updatedb.mlocat: checksumming directory block 0 [68668.599520] EXT4-fs error (device nvme0n1p2): ext4_find_entry:1447: inode #26479617: comm updatedb.mlocat: checksumming directory block 0 [68668.601525] EXT4-fs error (device nvme0n1p2): ext4_find_entry:1447: inode #26479617: comm updatedb.mlocat: checksumming directory block 0 [68668.603489] EXT4-fs error (device nvme0n1p2): ext4_find_entry:1447: inode #26479617: comm updatedb.mlocat: checksumming directory block 0 [68668.605403] EXT4-fs error (device nvme0n1p2): ext4_find_entry:1447: inode #26479617: comm updatedb.mlocat: checksumming directory block 0 [68668.607379] EXT4-fs error (device nvme0n1p2): ext4_find_entry:1447: inode #26479617: comm updatedb.mlocat: checksumming directory block 0 [68970.398177] audit: type=1400 audit(1519614768.685:44): apparmor="DENIED" operation="capable" profile="/usr/sbin/cupsd" pid=11872 comm="cupsd" capability=12 capname="net_admin" [70578.929656] CPU2: Core temperature above threshold, cpu clock throttled (total events = 712200) [70578.929656] CPU0: Core temperature above threshold, cpu clock throttled (total events = 712223) [70578.929659] CPU3: Package temperature above threshold, cpu clock throttled (total events = 783686) [70578.929659] CPU1: Package temperature above threshold, cpu clock throttled (total events = 783712) [70578.929662] CPU0: Package temperature above threshold, cpu clock throttled (total events = 783717) [70578.929666] CPU2: Package temperature above threshold, cpu clock throttled (total events = 783685) [70578.930558] CPU2: Core temperature/speed normal [70578.930559] CPU0: Core temperature/speed normal [70578.930560] CPU1: Package temperature/speed normal [70578.930560] CPU3: Package temperature/speed normal [70578.930561] CPU0: Package temperature/speed normal [70578.930561] CPU2: Package temperature/speed normal [70630.805040] virbr0: port 2(vnet0) entered disabled state [70630.806745] device vnet0 left promiscuous mode [70630.806752] virbr0: port 2(vnet0) entered disabled state [70631.364205] audit: type=1400 audit(1519616429.742:45): apparmor="STATUS" operation="profile_remove" profile="unconfined" name="libvirt-07c4040c-b1a8-4849-9f15-dcf01356c56b" pid=12422 comm="apparmor_parser" What's the relation between CPU temperature and the SSD entering in read-only mode? I'm not going to compile this QT again, too much heat (and it was on a flat surface) What do you think?