{"api_version":"1","generated_at":"2026-08-04T14:27:55+00:00","cve":"CVE-2024-42266","urls":{"html":"https://cve.report/CVE-2024-42266","api":"https://cve.report/api/cve/CVE-2024-42266.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2024-42266","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2024-42266"},"summary":{"title":"btrfs: make cow_file_range_inline() honor locked_page on error","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: make cow_file_range_inline() honor locked_page on error\n\nThe btrfs buffered write path runs through __extent_writepage() which\nhas some tricky return value handling for writepage_delalloc().\nSpecifically, when that returns 1, we exit, but for other return values\nwe continue and end up calling btrfs_folio_end_all_writers(). If the\nfolio has been unlocked (note that we check the PageLocked bit at the\nstart of __extent_writepage()), this results in an assert panic like\nthis one from syzbot:\n\n  BTRFS: error (device loop0 state EAL) in free_log_tree:3267: errno=-5 IO failure\n  BTRFS warning (device loop0 state EAL): Skipping commit of aborted transaction.\n  BTRFS: error (device loop0 state EAL) in cleanup_transaction:2018: errno=-5 IO failure\n  assertion failed: folio_test_locked(folio), in fs/btrfs/subpage.c:871\n  ------------[ cut here ]------------\n  kernel BUG at fs/btrfs/subpage.c:871!\n  Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI\n  CPU: 1 PID: 5090 Comm: syz-executor225 Not tainted\n  6.10.0-syzkaller-05505-gb1bc554e009e #0\n  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS\n  Google 06/27/2024\n  RIP: 0010:btrfs_folio_end_all_writers+0x55b/0x610 fs/btrfs/subpage.c:871\n  Code: e9 d3 fb ff ff e8 25 22 c2 fd 48 c7 c7 c0 3c 0e 8c 48 c7 c6 80 3d\n  0e 8c 48 c7 c2 60 3c 0e 8c b9 67 03 00 00 e8 66 47 ad 07 90 <0f> 0b e8\n  6e 45 b0 07 4c 89 ff be 08 00 00 00 e8 21 12 25 fe 4c 89\n  RSP: 0018:ffffc900033d72e0 EFLAGS: 00010246\n  RAX: 0000000000000045 RBX: 00fff0000000402c RCX: 663b7a08c50a0a00\n  RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000\n  RBP: ffffc900033d73b0 R08: ffffffff8176b98c R09: 1ffff9200067adfc\n  R10: dffffc0000000000 R11: fffff5200067adfd R12: 0000000000000001\n  R13: dffffc0000000000 R14: 0000000000000000 R15: ffffea0001cbee80\n  FS:  0000000000000000(0000) GS:ffff8880b9500000(0000)\n  knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f5f076012f8 CR3: 000000000e134000 CR4: 00000000003506f0\n  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n  Call Trace:\n  <TASK>\n  __extent_writepage fs/btrfs/extent_io.c:1597 [inline]\n  extent_write_cache_pages fs/btrfs/extent_io.c:2251 [inline]\n  btrfs_writepages+0x14d7/0x2760 fs/btrfs/extent_io.c:2373\n  do_writepages+0x359/0x870 mm/page-writeback.c:2656\n  filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:397\n  __filemap_fdatawrite_range mm/filemap.c:430 [inline]\n  __filemap_fdatawrite mm/filemap.c:436 [inline]\n  filemap_flush+0xdf/0x130 mm/filemap.c:463\n  btrfs_release_file+0x117/0x130 fs/btrfs/file.c:1547\n  __fput+0x24a/0x8a0 fs/file_table.c:422\n  task_work_run+0x24f/0x310 kernel/task_work.c:222\n  exit_task_work include/linux/task_work.h:40 [inline]\n  do_exit+0xa2f/0x27f0 kernel/exit.c:877\n  do_group_exit+0x207/0x2c0 kernel/exit.c:1026\n  __do_sys_exit_group kernel/exit.c:1037 [inline]\n  __se_sys_exit_group kernel/exit.c:1035 [inline]\n  __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1035\n  x64_sys_call+0x2634/0x2640\n  arch/x86/include/generated/asm/syscalls_64.h:232\n  do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n  do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n  RIP: 0033:0x7f5f075b70c9\n  Code: Unable to access opcode bytes at\n  0x7f5f075b709f.\n\nI was hitting the same issue by doing hundreds of accelerated runs of\ngeneric/475, which also hits IO errors by design.\n\nI instrumented that reproducer with bpftrace and found that the\nundesirable folio_unlock was coming from the following callstack:\n\n  folio_unlock+5\n  __process_pages_contig+475\n  cow_file_range_inline.constprop.0+230\n  cow_file_range+803\n  btrfs_run_delalloc_range+566\n  writepage_delalloc+332\n  __extent_writepage # inlined in my stacktrace, but I added it here\n  extent_write_cache_pages+622\n\nLooking at the bisected-to pa\n---truncated---","state":"PUBLISHED","assigner":"Linux","published_at":"2024-08-17 09:15:07","updated_at":"2026-08-04 11:19:43"},"problem_types":["CWE-476"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"5.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/061e41581606000a83ce0f0f01d6ad338f3704e9","name":"https://git.kernel.org/stable/c/061e41581606000a83ce0f0f01d6ad338f3704e9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/478574370bef7951fbd9ef5155537d6cbed49472","name":"https://git.kernel.org/stable/c/478574370bef7951fbd9ef5155537d6cbed49472","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2024-42266","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-42266","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0586d0a89e77d717da14df42648ace4a9fd67981 061e41581606000a83ce0f0f01d6ad338f3704e9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0586d0a89e77d717da14df42648ace4a9fd67981 478574370bef7951fbd9ef5155537d6cbed49472 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.10","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.10 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.10.4 6.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.11 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2024","cve_id":"42266","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2024","cve_id":"42266","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"6.11","cpe7":"rc1","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2024-42266","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA 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Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/btrfs/inode.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"061e41581606000a83ce0f0f01d6ad338f3704e9","status":"affected","version":"0586d0a89e77d717da14df42648ace4a9fd67981","versionType":"git"},{"lessThan":"478574370bef7951fbd9ef5155537d6cbed49472","status":"affected","version":"0586d0a89e77d717da14df42648ace4a9fd67981","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/btrfs/inode.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.10"},{"lessThan":"6.10","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.10.*","status":"unaffected","version":"6.10.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.11","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.10.4","versionStartIncluding":"6.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.11","versionStartIncluding":"6.10","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: make cow_file_range_inline() honor locked_page on error\n\nThe btrfs buffered write path runs through __extent_writepage() which\nhas some tricky return value handling for writepage_delalloc().\nSpecifically, when that returns 1, we exit, but for other return values\nwe continue and end up calling btrfs_folio_end_all_writers(). If the\nfolio has been unlocked (note that we check the PageLocked bit at the\nstart of __extent_writepage()), this results in an assert panic like\nthis one from syzbot:\n\n  BTRFS: error (device loop0 state EAL) in free_log_tree:3267: errno=-5 IO failure\n  BTRFS warning (device loop0 state EAL): Skipping commit of aborted transaction.\n  BTRFS: error (device loop0 state EAL) in cleanup_transaction:2018: errno=-5 IO failure\n  assertion failed: folio_test_locked(folio), in fs/btrfs/subpage.c:871\n  ------------[ cut here ]------------\n  kernel BUG at fs/btrfs/subpage.c:871!\n  Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI\n  CPU: 1 PID: 5090 Comm: syz-executor225 Not tainted\n  6.10.0-syzkaller-05505-gb1bc554e009e #0\n  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS\n  Google 06/27/2024\n  RIP: 0010:btrfs_folio_end_all_writers+0x55b/0x610 fs/btrfs/subpage.c:871\n  Code: e9 d3 fb ff ff e8 25 22 c2 fd 48 c7 c7 c0 3c 0e 8c 48 c7 c6 80 3d\n  0e 8c 48 c7 c2 60 3c 0e 8c b9 67 03 00 00 e8 66 47 ad 07 90 <0f> 0b e8\n  6e 45 b0 07 4c 89 ff be 08 00 00 00 e8 21 12 25 fe 4c 89\n  RSP: 0018:ffffc900033d72e0 EFLAGS: 00010246\n  RAX: 0000000000000045 RBX: 00fff0000000402c RCX: 663b7a08c50a0a00\n  RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000\n  RBP: ffffc900033d73b0 R08: ffffffff8176b98c R09: 1ffff9200067adfc\n  R10: dffffc0000000000 R11: fffff5200067adfd R12: 0000000000000001\n  R13: dffffc0000000000 R14: 0000000000000000 R15: ffffea0001cbee80\n  FS:  0000000000000000(0000) GS:ffff8880b9500000(0000)\n  knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f5f076012f8 CR3: 000000000e134000 CR4: 00000000003506f0\n  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n  Call Trace:\n  <TASK>\n  __extent_writepage fs/btrfs/extent_io.c:1597 [inline]\n  extent_write_cache_pages fs/btrfs/extent_io.c:2251 [inline]\n  btrfs_writepages+0x14d7/0x2760 fs/btrfs/extent_io.c:2373\n  do_writepages+0x359/0x870 mm/page-writeback.c:2656\n  filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:397\n  __filemap_fdatawrite_range mm/filemap.c:430 [inline]\n  __filemap_fdatawrite mm/filemap.c:436 [inline]\n  filemap_flush+0xdf/0x130 mm/filemap.c:463\n  btrfs_release_file+0x117/0x130 fs/btrfs/file.c:1547\n  __fput+0x24a/0x8a0 fs/file_table.c:422\n  task_work_run+0x24f/0x310 kernel/task_work.c:222\n  exit_task_work include/linux/task_work.h:40 [inline]\n  do_exit+0xa2f/0x27f0 kernel/exit.c:877\n  do_group_exit+0x207/0x2c0 kernel/exit.c:1026\n  __do_sys_exit_group kernel/exit.c:1037 [inline]\n  __se_sys_exit_group kernel/exit.c:1035 [inline]\n  __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1035\n  x64_sys_call+0x2634/0x2640\n  arch/x86/include/generated/asm/syscalls_64.h:232\n  do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n  do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n  RIP: 0033:0x7f5f075b70c9\n  Code: Unable to access opcode bytes at\n  0x7f5f075b709f.\n\nI was hitting the same issue by doing hundreds of accelerated runs of\ngeneric/475, which also hits IO errors by design.\n\nI instrumented that reproducer with bpftrace and found that the\nundesirable folio_unlock was coming from the following callstack:\n\n  folio_unlock+5\n  __process_pages_contig+475\n  cow_file_range_inline.constprop.0+230\n  cow_file_range+803\n  btrfs_run_delalloc_range+566\n  writepage_delalloc+332\n  __extent_writepage # inlined in my stacktrace, but I added it here\n  extent_write_cache_pages+622\n\nLooking at the bisected-to pa\n---truncated---"}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-08-04T09:29:18.578Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/061e41581606000a83ce0f0f01d6ad338f3704e9"},{"url":"https://git.kernel.org/stable/c/478574370bef7951fbd9ef5155537d6cbed49472"}],"title":"btrfs: make cow_file_range_inline() honor locked_page on error","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2024-42266","datePublished":"2024-08-17T08:54:22.308Z","dateReserved":"2024-07-30T07:40:12.259Z","dateUpdated":"2026-08-04T09:29:18.578Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2024-08-17 09:15:07","lastModifiedDate":"2026-08-04 11:19:43","problem_types":["CWE-476"],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2024-09-10T16:12:27.580534Z","id":"CVE-2024-42266","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.10.4","matchCriteriaId":"58294AC2-8D9E-4C90-B6EC-7C210C28ECB6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*","matchCriteriaId":"8B3CE743-2126-47A3-8B7C-822B502CF119"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2024","CveId":"42266","Ordinal":"1","Title":"btrfs: make cow_file_range_inline() honor locked_page on error","CVE":"CVE-2024-42266","Year":"2024"},"notes":[{"CveYear":"2024","CveId":"42266","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: make cow_file_range_inline() honor locked_page on error\n\nThe btrfs buffered write path runs through __extent_writepage() which\nhas some tricky return value handling for writepage_delalloc().\nSpecifically, when that returns 1, we exit, but for other return values\nwe continue and end up calling btrfs_folio_end_all_writers(). If the\nfolio has been unlocked (note that we check the PageLocked bit at the\nstart of __extent_writepage()), this results in an assert panic like\nthis one from syzbot:\n\n  BTRFS: error (device loop0 state EAL) in free_log_tree:3267: errno=-5 IO failure\n  BTRFS warning (device loop0 state EAL): Skipping commit of aborted transaction.\n  BTRFS: error (device loop0 state EAL) in cleanup_transaction:2018: errno=-5 IO failure\n  assertion failed: folio_test_locked(folio), in fs/btrfs/subpage.c:871\n  ------------[ cut here ]------------\n  kernel BUG at fs/btrfs/subpage.c:871!\n  Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI\n  CPU: 1 PID: 5090 Comm: syz-executor225 Not tainted\n  6.10.0-syzkaller-05505-gb1bc554e009e #0\n  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS\n  Google 06/27/2024\n  RIP: 0010:btrfs_folio_end_all_writers+0x55b/0x610 fs/btrfs/subpage.c:871\n  Code: e9 d3 fb ff ff e8 25 22 c2 fd 48 c7 c7 c0 3c 0e 8c 48 c7 c6 80 3d\n  0e 8c 48 c7 c2 60 3c 0e 8c b9 67 03 00 00 e8 66 47 ad 07 90 <0f> 0b e8\n  6e 45 b0 07 4c 89 ff be 08 00 00 00 e8 21 12 25 fe 4c 89\n  RSP: 0018:ffffc900033d72e0 EFLAGS: 00010246\n  RAX: 0000000000000045 RBX: 00fff0000000402c RCX: 663b7a08c50a0a00\n  RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000\n  RBP: ffffc900033d73b0 R08: ffffffff8176b98c R09: 1ffff9200067adfc\n  R10: dffffc0000000000 R11: fffff5200067adfd R12: 0000000000000001\n  R13: dffffc0000000000 R14: 0000000000000000 R15: ffffea0001cbee80\n  FS:  0000000000000000(0000) GS:ffff8880b9500000(0000)\n  knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f5f076012f8 CR3: 000000000e134000 CR4: 00000000003506f0\n  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n  Call Trace:\n  <TASK>\n  __extent_writepage fs/btrfs/extent_io.c:1597 [inline]\n  extent_write_cache_pages fs/btrfs/extent_io.c:2251 [inline]\n  btrfs_writepages+0x14d7/0x2760 fs/btrfs/extent_io.c:2373\n  do_writepages+0x359/0x870 mm/page-writeback.c:2656\n  filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:397\n  __filemap_fdatawrite_range mm/filemap.c:430 [inline]\n  __filemap_fdatawrite mm/filemap.c:436 [inline]\n  filemap_flush+0xdf/0x130 mm/filemap.c:463\n  btrfs_release_file+0x117/0x130 fs/btrfs/file.c:1547\n  __fput+0x24a/0x8a0 fs/file_table.c:422\n  task_work_run+0x24f/0x310 kernel/task_work.c:222\n  exit_task_work include/linux/task_work.h:40 [inline]\n  do_exit+0xa2f/0x27f0 kernel/exit.c:877\n  do_group_exit+0x207/0x2c0 kernel/exit.c:1026\n  __do_sys_exit_group kernel/exit.c:1037 [inline]\n  __se_sys_exit_group kernel/exit.c:1035 [inline]\n  __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1035\n  x64_sys_call+0x2634/0x2640\n  arch/x86/include/generated/asm/syscalls_64.h:232\n  do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n  do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n  RIP: 0033:0x7f5f075b70c9\n  Code: Unable to access opcode bytes at\n  0x7f5f075b709f.\n\nI was hitting the same issue by doing hundreds of accelerated runs of\ngeneric/475, which also hits IO errors by design.\n\nI instrumented that reproducer with bpftrace and found that the\nundesirable folio_unlock was coming from the following callstack:\n\n  folio_unlock+5\n  __process_pages_contig+475\n  cow_file_range_inline.constprop.0+230\n  cow_file_range+803\n  btrfs_run_delalloc_range+566\n  writepage_delalloc+332\n  __extent_writepage # inlined in my stacktrace, but I added it here\n  extent_write_cache_pages+622\n\nLooking at the bisected-to pa\n---truncated---","Type":"Description","Title":"btrfs: make cow_file_range_inline() honor locked_page on error"}]}}}