Public bug reported: Hi!
'btrfs receive' ALLOCATES ALL the available space for DATA immediately right after 'btrfs receive'/BTRBK start. I did format on target partition with BTRFS. Started and interrupted BTRBK/'btrfs receive' after few seconds (on SSD). Device unallocated: 1.00MiB even though only "Used:2.11GiB (0.24%))" for DATA. BTRFS team believes this is a Ubuntu's Kernel related issue. The partition usually soon become UNUSABLE due to lack of unallocated space. This is a HIGH Priority bug in Ubuntu 24.04.1. What you expected to happen: 'btrfs receive' should NOT ALLOCATE all available space for DATA or even a large portion of it on a freshly formatted partition when only 0.24% used. btrfs-progs v6.6.3 Kernel 6.8.0-50-generic (default in Ubuntu 24.04.1 LTS for today, no custom build). The system is fully updated. lsb_release -rd No LSB modules are available. Description: Ubuntu 24.04.1 LTS Release: 24.04 apt-cache policy btrfs-progs btrfs-progs: Installed: 6.6.3-1.1build2 Candidate: 6.6.3-1.1build2 Version table: *** 6.6.3-1.1build2 500 500 http://us.archive.ubuntu.com/ubuntu noble/main amd64 Packages 100 /var/lib/dpkg/status ============================================== sudo btrfs fi usage . Overall: Device size: 870.10GiB Device allocated: 870.10GiB Device unallocated: 1.00MiB Device missing: 0.00B Device slack: 0.00B Used: 2.37GiB Free (estimated): 865.98GiB (min: 865.98GiB) Free (statfs, df): 865.98GiB Data ratio: 1.00 Metadata ratio: 2.00 Global reserve: 5.50MiB (used: 0.00B) Multiple profiles: no Data,single: Size:868.08GiB, Used:2.11GiB (0.24%) /dev/mapper/DELETED 868.08GiB Metadata,DUP: Size:1.00GiB, Used:135.81MiB (13.26%) /dev/mapper/DELETED 2.00GiB System,DUP: Size:8.00MiB, Used:112.00KiB (1.37%) /dev/mapper/DELETED 16.00MiB Unallocated: /dev/mapper/DELETED 1.00MiB ** Affects: btrfs-progs (Ubuntu) Importance: Undecided Status: New ** Affects: btrfs-tools (Ubuntu) Importance: Undecided Status: New ** Tags: btrfs btrfs-progs receive ** Description changed: Hi! 'btrfs receive' ALLOCATES ALL the available space for DATA immediately right after 'btrfs receive'/BTRBK start. - I did format on target partition with BTRFS. + I did format on target partition with BTRFS. Started and interrupted BTRBK/'btrfs receive' after few seconds (on SSD). - Device unallocated: 1.00MiB even though only "Used:2.11GiB (0.24%))" + Device unallocated: 1.00MiB even though only "Used:2.11GiB (0.24%))" for + DATA. BTRFS team believes this is a Ubuntu's Kernel related issue. The partition usually soon become UNUSABLE due to lack of unallocated space. This is a HIGH Priority bug in Ubuntu 24.04.1. What you expected to happen: 'btrfs receive' should NOT ALLOCATE all available space for DATA or even a large portion of it on a freshly formatted partition when only 0.24% used. btrfs-progs v6.6.3 Kernel 6.8.0-50-generic (default in Ubuntu 24.04.1 LTS for today, no custom build). The system is fully updated. lsb_release -rd No LSB modules are available. Description: Ubuntu 24.04.1 LTS Release: 24.04 apt-cache policy btrfs-progs btrfs-progs: - Installed: 6.6.3-1.1build2 - Candidate: 6.6.3-1.1build2 - Version table: - *** 6.6.3-1.1build2 500 - 500 http://us.archive.ubuntu.com/ubuntu noble/main amd64 Packages - 100 /var/lib/dpkg/status + Installed: 6.6.3-1.1build2 + Candidate: 6.6.3-1.1build2 + Version table: + *** 6.6.3-1.1build2 500 + 500 http://us.archive.ubuntu.com/ubuntu noble/main amd64 Packages + 100 /var/lib/dpkg/status ============================================== sudo btrfs fi usage . Overall: Device size: 870.10GiB Device allocated: 870.10GiB Device unallocated: 1.00MiB Device missing: 0.00B Device slack: 0.00B Used: 2.37GiB Free (estimated): 865.98GiB (min: 865.98GiB) Free (statfs, df): 865.98GiB Data ratio: 1.00 Metadata ratio: 2.00 Global reserve: 5.50MiB (used: 0.00B) Multiple profiles: no Data,single: Size:868.08GiB, Used:2.11GiB (0.24%) /dev/mapper/DELETED 868.08GiB Metadata,DUP: Size:1.00GiB, Used:135.81MiB (13.26%) /dev/mapper/DELETED 2.00GiB System,DUP: Size:8.00MiB, Used:112.00KiB (1.37%) /dev/mapper/DELETED 16.00MiB Unallocated: /dev/mapper/DELETED 1.00MiB -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2091894 Title: btrfs receive allocates ALL space for DATA & makes it UNUSABLE (24.04.1) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/btrfs-progs/+bug/2091894/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
