{"id":"CVE-2022-50089","aliases":["DEBIAN-CVE-2022-50089","EUVD-2022-55355","GHSA-785m-wwrq-6238","UBUNTU-CVE-2022-50089"],"status":"published","title":"btrfs: ensure pages are unlocked on cow_file_range() failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: ensure pages are unlocked on cow_file_range() failure\n\nThere is a hung_task report on zoned btrfs like below.\n\nhttps://github.com/naota/linux/issues/59\n\n  [726.328648] INFO: task rocksdb:high0:11085 blocked for more than 241 seconds.\n  [726.329839]       Not tainted 5.16.0-rc1+ #1\n  [726.330484] \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n  [726.331603] task:rocksdb:high0   state:D stack:    0 pid:11085 ppid: 11082 flags:0x00000000\n  [726.331608] Call Trace:\n  [726.331611]  \u003cTASK\u003e\n  [726.331614]  __schedule+0x2e5/0x9d0\n  [726.331622]  schedule+0x58/0xd0\n  [726.331626]  io_schedule+0x3f/0x70\n  [726.331629]  __folio_lock+0x125/0x200\n  [726.331634]  ? find_get_entries+0x1bc/0x240\n  [726.331638]  ? filemap_invalidate_unlock_two+0x40/0x40\n  [726.331642]  truncate_inode_pages_range+0x5b2/0x770\n  [726.331649]  truncate_inode_pages_final+0x44/0x50\n  [726.331653]  btrfs_evict_inode+0x67/0x480\n  [726.331658]  evict+0xd0/0x180\n  [726.331661]  iput+0x13f/0x200\n  [726.331664]  do_unlinkat+0x1c0/0x2b0\n  [726.331668]  __x64_sys_unlink+0x23/0x30\n  [726.331670]  do_syscall_64+0x3b/0xc0\n  [726.331674]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n  [726.331677] RIP: 0033:0x7fb9490a171b\n  [726.331681] RSP: 002b:00007fb943ffac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000057\n  [726.331684] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb9490a171b\n  [726.331686] RDX: 00007fb943ffb040 RSI: 000055a6bbe6ec20 RDI: 00007fb94400d300\n  [726.331687] RBP: 00007fb943ffad00 R08: 0000000000000000 R09: 0000000000000000\n  [726.331688] R10: 0000000000000031 R11: 0000000000000246 R12: 00007fb943ffb000\n  [726.331690] R13: 00007fb943ffb040 R14: 0000000000000000 R15: 00007fb943ffd260\n  [726.331693]  \u003c/TASK\u003e\n\nWhile we debug the issue, we found running fstests generic/551 on 5GB\nnon-zoned null_blk device in the emulated zoned mode also had a\nsimilar hung issue.\n\nAlso, we can reproduce the same symptom with an error injected\ncow_file_range() setup.\n\nThe hang occurs when cow_file_range() fails in the middle of\nallocation. cow_file_range() called from do_allocation_zoned() can\nsplit the give region ([start, end]) for allocation depending on\ncurrent block group usages. When btrfs can allocate bytes for one part\nof the split regions but fails for the other region (e.g. because of\n-ENOSPC), we return the error leaving the pages in the succeeded regions\nlocked. Technically, this occurs only when @unlock == 0. Otherwise, we\nunlock the pages in an allocated region after creating an ordered\nextent.\n\nConsidering the callers of cow_file_range(unlock=0) won't write out\nthe pages, we can unlock the pages on error exit from\ncow_file_range(). So, we can ensure all the pages except @locked_page\nare unlocked on error case.\n\nIn summary, cow_file_range now behaves like this:\n\n- page_started == 1 (return value)\n  - All the pages are unlocked. IO is started.\n- unlock == 1\n  - All the pages except @locked_page are unlocked in any case\n- unlock == 0\n  - On success, all the pages are locked for writing out them\n  - On failure, all the pages except @locked_page are unlocked","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00193,"percentile":0.09034,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2025-06-18T11:02:29Z","modified":"2026-10-28T02:30:37Z","fixes":[{"ecosystem":"Linux","package":"Kernel","fixed_in":["5.15.61","5.18.18","5.19.2"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"linux","fixed_in":["6.0.2-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"linux","fixed_in":["6.0.2-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"linux","fixed_in":["6.0.2-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"linux-aws-5.15","fixed_in":["5.15.0-1023.27~20.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"linux-azure-5.15","fixed_in":["5.15.0-1023.29~20.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"linux-gcp-5.15","fixed_in":["5.15.0-1022.29~20.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"linux-hwe-5.15","fixed_in":["5.15.0-53.59~20.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"linux-intel-iotg-5.15","fixed_in":["5.15.0-1018.23~20.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"linux-lowlatency-hwe-5.15","fixed_in":["5.15.0-53.59~20.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"linux-oracle-5.15","fixed_in":["5.15.0-1022.28~20.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"linux-riscv-5.15","fixed_in":["5.15.0-1023.27~20.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"linux","fixed_in":["5.15.0-53.59"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"linux-aws","fixed_in":["5.15.0-1023.27"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"linux-azure","fixed_in":["5.15.0-1023.29"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"linux-azure-fde","fixed_in":["5.15.0-1024.30.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"linux-gcp","fixed_in":["5.15.0-1022.29"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"linux-gke","fixed_in":["5.15.0-1020.25"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"linux-gkeop","fixed_in":["5.15.0-1008.12"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"linux-ibm","fixed_in":["5.15.0-1018.21"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"linux-intel-iotg","fixed_in":["5.15.0-1018.23"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"linux-kvm","fixed_in":["5.15.0-1021.26"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"linux-lowlatency","fixed_in":["5.15.0-53.59"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"linux-nvidia","fixed_in":["5.15.0-1015.15"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"linux-oracle","fixed_in":["5.15.0-1022.28"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"linux-raspi","fixed_in":["5.15.0-1018.20"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:Realtime:22.04:LTS","package":"linux-realtime","fixed_in":["5.15.0-1025.28"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Linux","package":"Kernel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.12.0"},{"fixed":"5.15.61"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"5.18.18"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.19.0"},{"fixed":"5.19.2"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.2-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.2-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.2-1"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"linux-hwe-edge","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.0-28.30~16.04.1","4.8.0-30.32~16.04.1","4.8.0-32.34~16.04.1","4.8.0-34.36~16.04.1","4.10.0-14.16~16.04.1","4.10.0-19.21~16.04.1","4.10.0-20.22~16.04.1","4.10.0-21.23~16.04.1","4.10.0-22.24~16.04.1","4.10.0-24.28~16.04.1","4.10.0-26.30~16.04.1","4.11.0-13.19~16.04.1","4.11.0-14.20~16.04.1","4.13.0-16.19~16.04.3","4.13.0-17.20~16.04.1","4.13.0-19.22~16.04.1","4.13.0-21.24~16.04.1","4.13.0-25.29~16.04.2","4.15.0-13.14~16.04.1","4.15.0-15.16~16.04.1","4.15.0-20.21~16.04.1","4.15.0-22.24~16.04.1","4.15.0-23.25~16.04.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"linux-aws-5.0","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0.0-1021.24~18.04.1","5.0.0-1022.25~18.04.1","5.0.0-1023.26~18.04.1","5.0.0-1024.27~18.04.1","5.0.0-1025.28","5.0.0-1027.30"]},{"source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ensure pages are unlocked on cow_file_range() failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: ensure pages are unlocked on cow_file_range() failure\n\nThere is a hung_task report on zoned btrfs like below.\n\nhttps://github.com/naota/linux/issues/59\n\n  [726.328648] INFO: task rocksdb:high0:11085 blocked for more than 241 seconds.\n  [726.329839]       Not tainted 5.16.0-rc1+ #1\n  [726.330484] \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n  [726.331603] task:rocksdb:high0   state:D stack:    0 pid:11085 ppid: 11082 flags:0x00000000\n  [726.331608] Call Trace:\n  [726.331611]  \u003cTASK\u003e\n  [726.331614]  __schedule+0x2e5/0x9d0\n  [726.331622]  schedule+0x58/0xd0\n  [726.331626]  io_schedule+0x3f/0x70\n  [726.331629]  __folio_lock+0x125/0x200\n  [726.331634]  ? find_get_entries+0x1bc/0x240\n  [726.331638]  ? filemap_invalidate_unlock_two+0x40/0x40\n  [726.331642]  truncate_inode_pages_range+0x5b2/0x770\n  [726.331649]  truncate_inode_pages_final+0x44/0x50\n  [726.331653]  btrfs_evict_inode+0x67/0x480\n  [726.331658]  evict+0xd0/0x180\n  [726.331661]  iput+0x13f/0x200\n  [726.331664]  do_unlinkat+0x1c0/0x2b0\n  [726.331668]  __x64_sys_unlink+0x23/0x30\n  [726.331670]  do_syscall_64+0x3b/0xc0\n  [726.331674]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n  [726.331677] RIP: 0033:0x7fb9490a171b\n  [726.331681] RSP: 002b:00007fb943ffac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000057\n  [726.331684] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb9490a171b\n  [726.331686] RDX: 00007fb943ffb040 RSI: 000055a6bbe6ec20 RDI: 00007fb94400d300\n  [726.331687] RBP: 00007fb943ffad00 R08: 0000000000000000 R09: 0000000000000000\n  [726.331688] R10: 0000000000000031 R11: 0000000000000246 R12: 00007fb943ffb000\n  [726.331690] R13: 00007fb943ffb040 R14: 0000000000000000 R15: 00007fb943ffd260\n  [726.331693]  \u003c/TASK\u003e\n\nWhile we debug the issue, we found running fstests generic/551 on 5GB\nnon-zoned null_blk device in the emulated zoned mode also had a\nsimilar hung issue.\n\nAlso, we can reproduce the same symptom with an error injected\ncow_file_range() setup.\n\nThe hang occurs when cow_file_range() fails in the middle of\nallocation. cow_file_range() called from do_allocation_zoned() can\nsplit the give region ([start, end]) for allocation depending on\ncurrent block group usages. When btrfs can allocate bytes for one part\nof the split regions but fails for the other region (e.g. because of\n-ENOSPC), we return the error leaving the pages in the succeeded regions\nlocked. Technically, this occurs only when @unlock == 0. Otherwise, we\nunlock the pages in an allocated region after creating an ordered\nextent.\n\nConsidering the callers of cow_file_range(unlock=0) won't write out\nthe pages, we can unlock the pages on error exit from\ncow_file_range(). So, we can ensure all the pages except @locked_page\nare unlocked on error case.\n\nIn summary, cow_file_range now behaves like this:\n\n- page_started == 1 (return value)\n  - All the pages are unlocked. IO is started.\n- unlock == 1\n  - All the pages except @locked_page are unlocked in any case\n- unlock == 0\n  - On success, all the pages are locked for writing out them\n  - On failure, all the pages except @locked_page are unlocked","status":"published","published":"2025-06-18T11:02:29.451Z","modified":"2026-05-11T19:12:36.948Z","updated_at":"2026-11-02T14:34:40.982917Z"}],"euvd":[{"id":"EUVD-2022-55355","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: ensure pages are unlocked on cow_file_range() failure\n\nThere is a hung_task report on zoned btrfs like below.\n\nhttps://github.com/naota/linux/issues/59\n\n  [726.328648] INFO: task rocksdb:high0:11085 blocked for more than 241 seconds.\n  [726.329839]       Not tainted 5.16.0-rc1+ #1\n  [726.330484] \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n  [726.331603] task:rocksdb:high0   state:D stack:    0 pid:11085 ppid: 11082 flags:0x00000000\n  [726.331608] Call Trace:\n  [726.331611]  \u003cTASK\u003e\n  [726.331614]  __schedule+0x2e5/0x9d0\n  [726.331622]  schedule+0x58/0xd0\n  [726.331626]  io_schedule+0x3f/0x70\n  [726.331629]  __folio_lock+0x125/0x200\n  [726.331634]  ? find_get_entries+0x1bc/0x240\n  [726.331638]  ? filemap_invalidate_unlock_two+0x40/0x40\n  [726.331642]  truncate_inode_pages_range+0x5b2/0x770\n  [726.331649]  truncate_inode_pages_final+0x44/0x50\n  [726.331653]  btrfs_evict_inode+0x67/0x480\n  [726.331658]  evict+0xd0/0x180\n  [726.331661]  iput+0x13f/0x200\n  [726.331664]  do_unlinkat+0x1c0/0x2b0\n  [726.331668]  __x64_sys_unlink+0x23/0x30\n  [726.331670]  do_syscall_64+0x3b/0xc0\n  [726.331674]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n  [726.331677] RIP: 0033:0x7fb9490a171b\n  [726.331681] RSP: 002b:00007fb943ffac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000057\n  [726.331684] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb9490a171b\n  [726.331686] RDX: 00007fb943ffb040 RSI: 000055a6bbe6ec20 RDI: 00007fb94400d300\n  [726.331687] RBP: 00007fb943ffad00 R08: 0000000000000000 R09: 0000000000000000\n  [726.331688] R10: 0000000000000031 R11: 0000000000000246 R12: 00007fb943ffb000\n  [726.331690] R13: 00007fb943ffb040 R14: 0000000000000000 R15: 00007fb943ffd260\n  [726.331693]  \u003c/TASK\u003e\n\nWhile we debug the issue, we found running fstests generic/551 on 5GB\nnon-zoned null_blk device in the emulated zoned mode also had a\nsimilar hung issue.\n\nAlso, we can reproduce the same symptom with an error injected\ncow_file_range() setup.\n\nThe hang occurs when cow_file_range() fails in the middle of\nallocation. cow_file_range() called from do_allocation_zoned() can\nsplit the give region ([start, end]) for allocation depending on\ncurrent block group usages. When btrfs can allocate bytes for one part\nof the split regions but fails for the other region (e.g. because of\n-ENOSPC), we return the error leaving the pages in the succeeded regions\nlocked. Technically, this occurs only when @unlock == 0. Otherwise, we\nunlock the pages in an allocated region after creating an ordered\nextent.\n\nConsidering the callers of cow_file_range(unlock=0) won't write out\nthe pages, we can unlock the pages on error exit from\ncow_file_range(). So, we can ensure all the pages except @locked_page\nare unlocked on error case.\n\nIn summary, cow_file_range now behaves like this:\n\n- page_started == 1 (return value)\n  - All the pages are unlocked. IO is started.\n- unlock == 1\n  - All the pages except @locked_page are unlocked in any case\n- unlock == 0\n  - On success, all the pages are locked for writing out them\n  - On failure, all the pages except @locked_page are unlocked","status":"published","published":"2025-06-18T11:02:29Z","modified":"2026-05-11T19:12:36Z","updated_at":"2026-11-02T19:05:05.924012Z"}],"ghsa":[{"id":"GHSA-785m-wwrq-6238","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: ensure pages are...","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: ensure pages are unlocked on cow_file_range() failure\n\nThere is a hung_task report on zoned btrfs like below.\n\nhttps://github.com/naota/linux/issues/59\n\n  [726.328648] INFO: task rocksdb:high0:11085 blocked for more than 241 seconds.\n  [726.329839]       Not tainted 5.16.0-rc1+ #1\n  [726.330484] \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n  [726.331603] task:rocksdb:high0   state:D stack:    0 pid:11085 ppid: 11082 flags:0x00000000\n  [726.331608] Call Trace:\n  [726.331611]  \u003cTASK\u003e\n  [726.331614]  __schedule+0x2e5/0x9d0\n  [726.331622]  schedule+0x58/0xd0\n  [726.331626]  io_schedule+0x3f/0x70\n  [726.331629]  __folio_lock+0x125/0x200\n  [726.331634]  ? find_get_entries+0x1bc/0x240\n  [726.331638]  ? filemap_invalidate_unlock_two+0x40/0x40\n  [726.331642]  truncate_inode_pages_range+0x5b2/0x770\n  [726.331649]  truncate_inode_pages_final+0x44/0x50\n  [726.331653]  btrfs_evict_inode+0x67/0x480\n  [726.331658]  evict+0xd0/0x180\n  [726.331661]  iput+0x13f/0x200\n  [726.331664]  do_unlinkat+0x1c0/0x2b0\n  [726.331668]  __x64_sys_unlink+0x23/0x30\n  [726.331670]  do_syscall_64+0x3b/0xc0\n  [726.331674]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n  [726.331677] RIP: 0033:0x7fb9490a171b\n  [726.331681] RSP: 002b:00007fb943ffac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000057\n  [726.331684] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb9490a171b\n  [726.331686] RDX: 00007fb943ffb040 RSI: 000055a6bbe6ec20 RDI: 00007fb94400d300\n  [726.331687] RBP: 00007fb943ffad00 R08: 0000000000000000 R09: 0000000000000000\n  [726.331688] R10: 0000000000000031 R11: 0000000000000246 R12: 00007fb943ffb000\n  [726.331690] R13: 00007fb943ffb040 R14: 0000000000000000 R15: 00007fb943ffd260\n  [726.331693]  \u003c/TASK\u003e\n\nWhile we debug the issue, we found running fstests generic/551 on 5GB\nnon-zoned null_blk device in the emulated zoned mode also had a\nsimilar hung issue.\n\nAlso, we can reproduce the same symptom with an error injected\ncow_file_range() setup.\n\nThe hang occurs when cow_file_range() fails in the middle of\nallocation. cow_file_range() called from do_allocation_zoned() can\nsplit the give region ([start, end]) for allocation depending on\ncurrent block group usages. When btrfs can allocate bytes for one part\nof the split regions but fails for the other region (e.g. because of\n-ENOSPC), we return the error leaving the pages in the succeeded regions\nlocked. Technically, this occurs only when @unlock == 0. Otherwise, we\nunlock the pages in an allocated region after creating an ordered\nextent.\n\nConsidering the callers of cow_file_range(unlock=0) won't write out\nthe pages, we can unlock the pages on error exit from\ncow_file_range(). So, we can ensure all the pages except @locked_page\nare unlocked on error case.\n\nIn summary, cow_file_range now behaves like this:\n\n- page_started == 1 (return value)\n  - All the pages are unlocked. IO is started.\n- unlock == 1\n  - All the pages except @locked_page are unlocked in any case\n- unlock == 0\n  - On success, all the pages are locked for writing out them\n  - On failure, all the pages except @locked_page are unlocked","status":"published","published":"2025-06-18T12:30:47Z","modified":"2025-11-18T03:31:14Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:04:50.769565Z"}],"nvd":[{"id":"CVE-2022-50089","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: ensure pages are unlocked on cow_file_range() failure\n\nThere is a hung_task report on zoned btrfs like below.\n\nhttps://github.com/naota/linux/issues/59\n\n  [726.328648] INFO: task rocksdb:high0:11085 blocked for more than 241 seconds.\n  [726.329839]       Not tainted 5.16.0-rc1+ #1\n  [726.330484] \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n  [726.331603] task:rocksdb:high0   state:D stack:    0 pid:11085 ppid: 11082 flags:0x00000000\n  [726.331608] Call Trace:\n  [726.331611]  \u003cTASK\u003e\n  [726.331614]  __schedule+0x2e5/0x9d0\n  [726.331622]  schedule+0x58/0xd0\n  [726.331626]  io_schedule+0x3f/0x70\n  [726.331629]  __folio_lock+0x125/0x200\n  [726.331634]  ? find_get_entries+0x1bc/0x240\n  [726.331638]  ? filemap_invalidate_unlock_two+0x40/0x40\n  [726.331642]  truncate_inode_pages_range+0x5b2/0x770\n  [726.331649]  truncate_inode_pages_final+0x44/0x50\n  [726.331653]  btrfs_evict_inode+0x67/0x480\n  [726.331658]  evict+0xd0/0x180\n  [726.331661]  iput+0x13f/0x200\n  [726.331664]  do_unlinkat+0x1c0/0x2b0\n  [726.331668]  __x64_sys_unlink+0x23/0x30\n  [726.331670]  do_syscall_64+0x3b/0xc0\n  [726.331674]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n  [726.331677] RIP: 0033:0x7fb9490a171b\n  [726.331681] RSP: 002b:00007fb943ffac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000057\n  [726.331684] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb9490a171b\n  [726.331686] RDX: 00007fb943ffb040 RSI: 000055a6bbe6ec20 RDI: 00007fb94400d300\n  [726.331687] RBP: 00007fb943ffad00 R08: 0000000000000000 R09: 0000000000000000\n  [726.331688] R10: 0000000000000031 R11: 0000000000000246 R12: 00007fb943ffb000\n  [726.331690] R13: 00007fb943ffb040 R14: 0000000000000000 R15: 00007fb943ffd260\n  [726.331693]  \u003c/TASK\u003e\n\nWhile we debug the issue, we found running fstests generic/551 on 5GB\nnon-zoned null_blk device in the emulated zoned mode also had a\nsimilar hung issue.\n\nAlso, we can reproduce the same symptom with an error injected\ncow_file_range() setup.\n\nThe hang occurs when cow_file_range() fails in the middle of\nallocation. cow_file_range() called from do_allocation_zoned() can\nsplit the give region ([start, end]) for allocation depending on\ncurrent block group usages. When btrfs can allocate bytes for one part\nof the split regions but fails for the other region (e.g. because of\n-ENOSPC), we return the error leaving the pages in the succeeded regions\nlocked. Technically, this occurs only when @unlock == 0. Otherwise, we\nunlock the pages in an allocated region after creating an ordered\nextent.\n\nConsidering the callers of cow_file_range(unlock=0) won't write out\nthe pages, we can unlock the pages on error exit from\ncow_file_range(). So, we can ensure all the pages except @locked_page\nare unlocked on error case.\n\nIn summary, cow_file_range now behaves like this:\n\n- page_started == 1 (return value)\n  - All the pages are unlocked. IO is started.\n- unlock == 1\n  - All the pages except @locked_page are unlocked in any case\n- unlock == 0\n  - On success, all the pages are locked for writing out them\n  - On failure, all the pages except @locked_page are unlocked","status":"published","published":"2025-06-18T11:15:38.023Z","modified":"2026-06-17T05:22:44.157Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:07:43.071398Z"}],"osv":[{"id":"DEBIAN-CVE-2022-50089","description":"In the Linux kernel, the following vulnerability has been resolved:  btrfs: ensure pages are unlocked on cow_file_range() failure  There is a hung_task report on zoned btrfs like below.  https://github.com/naota/linux/issues/59    [726.328648] INFO: task rocksdb:high0:11085 blocked for more than 241 seconds.   [726.329839]       Not tainted 5.16.0-rc1+ #1   [726.330484] \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.   [726.331603] task:rocksdb:high0   state:D stack:    0 pid:11085 ppid: 11082 flags:0x00000000   [726.331608] Call Trace:   [726.331611]  \u003cTASK\u003e   [726.331614]  __schedule+0x2e5/0x9d0   [726.331622]  schedule+0x58/0xd0   [726.331626]  io_schedule+0x3f/0x70   [726.331629]  __folio_lock+0x125/0x200   [726.331634]  ? find_get_entries+0x1bc/0x240   [726.331638]  ? filemap_invalidate_unlock_two+0x40/0x40   [726.331642]  truncate_inode_pages_range+0x5b2/0x770   [726.331649]  truncate_inode_pages_final+0x44/0x50   [726.331653]  btrfs_evict_inode+0x67/0x480   [726.331658]  evict+0xd0/0x180   [726.331661]  iput+0x13f/0x200   [726.331664]  do_unlinkat+0x1c0/0x2b0   [726.331668]  __x64_sys_unlink+0x23/0x30   [726.331670]  do_syscall_64+0x3b/0xc0   [726.331674]  entry_SYSCALL_64_after_hwframe+0x44/0xae   [726.331677] RIP: 0033:0x7fb9490a171b   [726.331681] RSP: 002b:00007fb943ffac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000057   [726.331684] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb9490a171b   [726.331686] RDX: 00007fb943ffb040 RSI: 000055a6bbe6ec20 RDI: 00007fb94400d300   [726.331687] RBP: 00007fb943ffad00 R08: 0000000000000000 R09: 0000000000000000   [726.331688] R10: 0000000000000031 R11: 0000000000000246 R12: 00007fb943ffb000   [726.331690] R13: 00007fb943ffb040 R14: 0000000000000000 R15: 00007fb943ffd260   [726.331693]  \u003c/TASK\u003e  While we debug the issue, we found running fstests generic/551 on 5GB non-zoned null_blk device in the emulated zoned mode also had a similar hung issue.  Also, we can reproduce the same symptom with an error injected cow_file_range() setup.  The hang occurs when cow_file_range() fails in the middle of allocation. cow_file_range() called from do_allocation_zoned() can split the give region ([start, end]) for allocation depending on current block group usages. When btrfs can allocate bytes for one part of the split regions but fails for the other region (e.g. because of -ENOSPC), we return the error leaving the pages in the succeeded regions locked. Technically, this occurs only when @unlock == 0. Otherwise, we unlock the pages in an allocated region after creating an ordered extent.  Considering the callers of cow_file_range(unlock=0) won't write out the pages, we can unlock the pages on error exit from cow_file_range(). So, we can ensure all the pages except @locked_page are unlocked on error case.  In summary, cow_file_range now behaves like this:  - page_started == 1 (return value)   - All the pages are unlocked. IO is started. - unlock == 1   - All the pages except @locked_page are unlocked in any case - unlock == 0   - On success, all the pages are locked for writing out them   - On failure, all the pages except @locked_page are unlocked","status":"published","published":"2025-06-18T11:15:38.023Z","modified":"2026-11-03T08:04:02.930163412Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-03T08:23:07.763774Z"},{"id":"UBUNTU-CVE-2022-50089","description":"In the Linux kernel, the following vulnerability has been resolved: btrfs: ensure pages are unlocked on cow_file_range() failure There is a hung_task report on zoned btrfs like below. https://github.com/naota/linux/issues/59   [726.328648] INFO: task rocksdb:high0:11085 blocked for more than 241 seconds.   [726.329839]       Not tainted 5.16.0-rc1+ #1   [726.330484] \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.   [726.331603] task:rocksdb:high0   state:D stack:    0 pid:11085 ppid: 11082 flags:0x00000000   [726.331608] Call Trace:   [726.331611]  \u003cTASK\u003e   [726.331614]  __schedule+0x2e5/0x9d0   [726.331622]  schedule+0x58/0xd0   [726.331626]  io_schedule+0x3f/0x70   [726.331629]  __folio_lock+0x125/0x200   [726.331634]  ? find_get_entries+0x1bc/0x240   [726.331638]  ? filemap_invalidate_unlock_two+0x40/0x40   [726.331642]  truncate_inode_pages_range+0x5b2/0x770   [726.331649]  truncate_inode_pages_final+0x44/0x50   [726.331653]  btrfs_evict_inode+0x67/0x480   [726.331658]  evict+0xd0/0x180   [726.331661]  iput+0x13f/0x200   [726.331664]  do_unlinkat+0x1c0/0x2b0   [726.331668]  __x64_sys_unlink+0x23/0x30   [726.331670]  do_syscall_64+0x3b/0xc0   [726.331674]  entry_SYSCALL_64_after_hwframe+0x44/0xae   [726.331677] RIP: 0033:0x7fb9490a171b   [726.331681] RSP: 002b:00007fb943ffac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000057   [726.331684] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb9490a171b   [726.331686] RDX: 00007fb943ffb040 RSI: 000055a6bbe6ec20 RDI: 00007fb94400d300   [726.331687] RBP: 00007fb943ffad00 R08: 0000000000000000 R09: 0000000000000000   [726.331688] R10: 0000000000000031 R11: 0000000000000246 R12: 00007fb943ffb000   [726.331690] R13: 00007fb943ffb040 R14: 0000000000000000 R15: 00007fb943ffd260   [726.331693]  \u003c/TASK\u003e While we debug the issue, we found running fstests generic/551 on 5GB non-zoned null_blk device in the emulated zoned mode also had a similar hung issue. Also, we can reproduce the same symptom with an error injected cow_file_range() setup. The hang occurs when cow_file_range() fails in the middle of allocation. cow_file_range() called from do_allocation_zoned() can split the give region ([start, end]) for allocation depending on current block group usages. When btrfs can allocate bytes for one part of the split regions but fails for the other region (e.g. because of -ENOSPC), we return the error leaving the pages in the succeeded regions locked. Technically, this occurs only when @unlock == 0. Otherwise, we unlock the pages in an allocated region after creating an ordered extent. Considering the callers of cow_file_range(unlock=0) won't write out the pages, we can unlock the pages on error exit from cow_file_range(). So, we can ensure all the pages except @locked_page are unlocked on error case. In summary, cow_file_range now behaves like this: - page_started == 1 (return value)   - All the pages are unlocked. IO is started. - unlock == 1   - All the pages except @locked_page are unlocked in any case - unlock == 0   - On success, all the pages are locked for writing out them   - On failure, all the pages except @locked_page are unlocked","status":"published","published":"2025-06-18T11:15:00Z","modified":"2026-11-03T14:34:11.329146527Z","cvss":[{"version":"4.0","score":5.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-03T15:17:11.325641Z"},{"id":"CVE-2022-50089","title":"btrfs: ensure pages are unlocked on cow_file_range() failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: ensure pages are unlocked on cow_file_range() failure\n\nThere is a hung_task report on zoned btrfs like below.\n\nhttps://github.com/naota/linux/issues/59\n\n  [726.328648] INFO: task rocksdb:high0:11085 blocked for more than 241 seconds.\n  [726.329839]       Not tainted 5.16.0-rc1+ #1\n  [726.330484] \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n  [726.331603] task:rocksdb:high0   state:D stack:    0 pid:11085 ppid: 11082 flags:0x00000000\n  [726.331608] Call Trace:\n  [726.331611]  \u003cTASK\u003e\n  [726.331614]  __schedule+0x2e5/0x9d0\n  [726.331622]  schedule+0x58/0xd0\n  [726.331626]  io_schedule+0x3f/0x70\n  [726.331629]  __folio_lock+0x125/0x200\n  [726.331634]  ? find_get_entries+0x1bc/0x240\n  [726.331638]  ? filemap_invalidate_unlock_two+0x40/0x40\n  [726.331642]  truncate_inode_pages_range+0x5b2/0x770\n  [726.331649]  truncate_inode_pages_final+0x44/0x50\n  [726.331653]  btrfs_evict_inode+0x67/0x480\n  [726.331658]  evict+0xd0/0x180\n  [726.331661]  iput+0x13f/0x200\n  [726.331664]  do_unlinkat+0x1c0/0x2b0\n  [726.331668]  __x64_sys_unlink+0x23/0x30\n  [726.331670]  do_syscall_64+0x3b/0xc0\n  [726.331674]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n  [726.331677] RIP: 0033:0x7fb9490a171b\n  [726.331681] RSP: 002b:00007fb943ffac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000057\n  [726.331684] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb9490a171b\n  [726.331686] RDX: 00007fb943ffb040 RSI: 000055a6bbe6ec20 RDI: 00007fb94400d300\n  [726.331687] RBP: 00007fb943ffad00 R08: 0000000000000000 R09: 0000000000000000\n  [726.331688] R10: 0000000000000031 R11: 0000000000000246 R12: 00007fb943ffb000\n  [726.331690] R13: 00007fb943ffb040 R14: 0000000000000000 R15: 00007fb943ffd260\n  [726.331693]  \u003c/TASK\u003e\n\nWhile we debug the issue, we found running fstests generic/551 on 5GB\nnon-zoned null_blk device in the emulated zoned mode also had a\nsimilar hung issue.\n\nAlso, we can reproduce the same symptom with an error injected\ncow_file_range() setup.\n\nThe hang occurs when cow_file_range() fails in the middle of\nallocation. cow_file_range() called from do_allocation_zoned() can\nsplit the give region ([start, end]) for allocation depending on\ncurrent block group usages. When btrfs can allocate bytes for one part\nof the split regions but fails for the other region (e.g. because of\n-ENOSPC), we return the error leaving the pages in the succeeded regions\nlocked. Technically, this occurs only when @unlock == 0. Otherwise, we\nunlock the pages in an allocated region after creating an ordered\nextent.\n\nConsidering the callers of cow_file_range(unlock=0) won't write out\nthe pages, we can unlock the pages on error exit from\ncow_file_range(). So, we can ensure all the pages except @locked_page\nare unlocked on error case.\n\nIn summary, cow_file_range now behaves like this:\n\n- page_started == 1 (return value)\n  - All the pages are unlocked. IO is started.\n- unlock == 1\n  - All the pages except @locked_page are unlocked in any case\n- unlock == 0\n  - On success, all the pages are locked for writing out them\n  - On failure, all the pages except @locked_page are unlocked","status":"published","published":"2025-06-18T11:02:29.451Z","modified":"2026-10-28T02:30:37.619499821Z","updated_at":"2026-11-02T15:44:28.74679Z"}]}}