Performing verification for Focal. I spun up a m5d.4xlarge instance on AWS, to utilise the 2x 300GB NVMe drives that support block discard.
I enabled -proposed, and installed the 5.4.0-58-generic kernel. The following is the repro session running through the full testcase: https://paste.ubuntu.com/p/Zr4C2pMbrk/ A 2 disk Raid10 array was created, LVM created and formatted ext4. I let the consistency checks finish, and created, then deleted a file. Did another consistency check, then performed a fstrim. After another consistency check, we unmount and perform a fsck on each individual disk. root@ip-172-31-1-147:/home/ubuntu# fsck.ext4 -n -f /dev/VolGroup/root e2fsck 1.45.5 (07-Jan-2020) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/VolGroup/root: 11/6553600 files (0.0% non-contiguous), 557848/26214400 blocks root@ip-172-31-1-147:/home/ubuntu# fsck.ext4 -n -f /dev/VolGroup/root e2fsck 1.45.5 (07-Jan-2020) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/VolGroup/root: 11/6553600 files (0.0% non-contiguous), 557848/26214400 blocks Both of them pass, there is no corruption to the filesystem. 5.4.0-58-generic fixes the problem, the revert is effective. Marking bug as verified for Focal. ** Tags removed: verification-needed-focal ** Tags added: verification-done-focal -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1907262 Title: raid10: discard leads to corrupted file system Status in linux package in Ubuntu: Confirmed Status in linux source package in Trusty: Invalid Status in linux source package in Xenial: Invalid Status in linux source package in Bionic: Fix Committed Status in linux source package in Focal: Fix Committed Status in linux source package in Groovy: Fix Committed Bug description: Seems to be closely related to https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1896578 After updating the Ubuntu 18.04 kernel from 4.15.0-124 to 4.15.0-126 the fstrim command triggered by fstrim.timer causes a severe number of mismatches between two RAID10 component devices. This bug affects several machines in our company with different HW configurations (All using ECC RAM). Both, NVMe and SATA SSDs are affected. How to reproduce: - Create a RAID10 LVM and filesystem on two SSDs mdadm -C -v -l10 -n2 -N "lv-raid" -R /dev/md0 /dev/nvme0n1p2 /dev/nvme1n1p2 pvcreate -ff -y /dev/md0 vgcreate -f -y VolGroup /dev/md0 lvcreate -n root -L 100G -ay -y VolGroup mkfs.ext4 /dev/VolGroup/root mount /dev/VolGroup/root /mnt - Write some data, sync and delete it dd if=/dev/zero of=/mnt/data.raw bs=4K count=1M sync rm /mnt/data.raw - Check the RAID device echo check >/sys/block/md0/md/sync_action - After finishing (see /proc/mdstat), check the mismatch_cnt (should be 0): cat /sys/block/md0/md/mismatch_cnt - Trigger the bug fstrim /mnt - Re-Check the RAID device echo check >/sys/block/md0/md/sync_action - After finishing (see /proc/mdstat), check the mismatch_cnt (probably in the range of N*10000): cat /sys/block/md0/md/mismatch_cnt After investigating this issue on several machines it *seems* that the first drive does the trim correctly while the second one goes wild. At least the number and severity of errors found by a USB stick live session fsck.ext4 suggests this. To perform the single drive evaluation the RAID10 was started using a single drive at once: mdadm --assemble /dev/md127 /dev/nvme0n1p2 mdadm --run /dev/md127 fsck.ext4 -n -f /dev/VolGroup/root vgchange -a n /dev/VolGroup mdadm --stop /dev/md127 mdadm --assemble /dev/md127 /dev/nvme1n1p2 mdadm --run /dev/md127 fsck.ext4 -n -f /dev/VolGroup/root When starting these fscks without -n, on the first device it seems the directory structure is OK while on the second device there is only the lost+found folder left. Side-note: Another machine using HWE kernel 5.4.0-56 (after using -53 before) seems to have a quite similar issue. Unfortunately the risk/regression assessment in the aforementioned bug is not complete: the workaround only mitigates the issues during FS creation. This bug on the other hand is triggered by a weekly service (fstrim) causing severe file system corruption. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1907262/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
