Reproducible on Ubuntu 22.04 LTS w/ linux-hwe-6.2 (zfs-2.1.9) using the NixOS test suite:
[zhammer::647] checking 10000 files at iteration 0 [zhammer::647] zhammer_647_0 differed from zhammer_647_576! [zhammer::647] Hexdump diff follows --- zhammer_647_0.hex 2023-11-30 15:37:43.887596987 +0000 +++ zhammer_647_576.hex 2023-11-30 15:37:43.891596970 +0000 @@ -1,3 +1,3 @@ -00000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................| +00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 00004000 [zhammer::639] checking 10000 files at iteration 0 [zhammer::631] checking 10000 files at iteration 0 [zhammer::635] checking 10000 files at iteration 0 [zhammer::677] checking 10000 files at iteration 0 parallel: This job failed: ./zhammer-min.sh /test 10000000 16k 10000 7 The zhammer script is available at: https://github.com/numinit/nixpkgs/blob/zhammer/nixos/tests/zhammer.sh The bootstrap for it is to use a ramdisk backed file: truncate -s 4G /dev/shm/zfs zpool create -f -o ashift=12 -O canmount=off -O mountpoint=none -O xattr=sa -O dnodesize=auto -O acltype=posix -O atime=off -O relatime=on tank /dev/shm/zfs zfs create -o canmount=on -o mountpoint=/test tank/test parallel --lb --halt-on-error now,fail=1 zhammer /test 10000000 16k 10000 ::: $(seq $(nproc)) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-hwe-6.5 in Ubuntu. https://bugs.launchpad.net/bugs/2044657 Title: zfs block cloning file system corruption Status in linux-hwe-6.2 package in Ubuntu: Confirmed Status in linux-hwe-6.5 package in Ubuntu: Confirmed Status in zfs-linux package in Ubuntu: Confirmed Bug description: OpenZFS 2.2 reportedly has a bug where block cloning might lead to file system corruption and data loss. This was fixed in OpenZFS 2.2.1. Original bug report: https://github.com/openzfs/zfs/issues/15526 and 2.2.1 release notes: https://github.com/openzfs/zfs/releases/tag/zfs-2.2.1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-6.2/+bug/2044657/+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
