WARNING in btrfs_chunk_alloc (2)

Status: upstream: reported C repro on 2023/09/25 19:35
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+35296bd1d0474bc662a2@syzkaller.appspotmail.com
First crash: 1050d, last: 7d13h
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/05/28 linux-5.15.y (ToT) 98f47d0e9b8c C [report] WARNING in btrfs_chunk_alloc
2025/05/28 upstream (ToT) b08494a8f741 C Didn't crash
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in btrfs_chunk_alloc -1 6 1154d 1237d 0/3 auto-obsoleted due to no activity on 2023/09/22 15:34
linux-6.1 WARNING in btrfs_chunk_alloc (2) origin:lts-only -1 syz, C done 66 7d19h 999d 0/3 upstream: reported C repro on 2023/11/15 16:30
linux-6.1 WARNING in btrfs_chunk_alloc -1 1 1232d 1232d 0/3 auto-obsoleted due to no activity on 2023/07/26 13:54
linux-6.6 WARNING in btrfs_chunk_alloc (2) origin:lts-only -1 syz, C inconclusive 10 57d 291d 0/2 upstream: reported C repro on 2025/10/24 07:19
upstream WARNING in btrfs_chunk_alloc btrfs -1 syz, C inconclusive done 1032 2h45m 1358d 0/29 upstream: reported C repro on 2022/11/22 11:56
linux-6.6 WARNING in btrfs_chunk_alloc -1 1 406d 406d 0/2 auto-obsoleted due to no activity on 2025/10/09 03:44
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/06/19 13:43 17m retest repro linux-5.15.y report log
2026/04/15 23:22 11m retest repro linux-5.15.y report log
2026/04/15 23:22 10m retest repro linux-5.15.y report log
2026/04/15 23:22 2h04m retest repro linux-5.15.y report log
2026/04/01 20:37 11m retest repro linux-5.15.y report log
2026/03/05 15:19 1h02m retest repro linux-5.15.y report log
2026/01/27 22:31 18m retest repro linux-5.15.y report log
2026/01/27 22:31 11m retest repro linux-5.15.y report log
2026/01/27 22:31 2h38m retest repro linux-5.15.y report log
2026/01/27 22:31 2h35m retest repro linux-5.15.y no crash log
▶ ▼ Fix bisection attempts (5)
Created Duration User Patch Repo Result
2026/05/05 14:33 16m bisect fix linux-5.15.y error job log
2025/10/31 08:29 2h21m bisect fix linux-5.15.y OK (0) job log log
2025/09/22 04:53 2h18m bisect fix linux-5.15.y OK (0) job log log
2025/08/02 04:01 2h33m fix candidate upstream OK (0) job log log
2023/10/26 03:59 0m bisect fix linux-5.15.y error job log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 161 at fs/btrfs/block-group.c:3509 do_chunk_alloc fs/btrfs/block-group.c:3509 [inline]
WARNING: CPU: 1 PID: 161 at fs/btrfs/block-group.c:3509 btrfs_chunk_alloc+0xc59/0x10a0 fs/btrfs/block-group.c:3732
Modules linked in:
CPU: 1 PID: 161 Comm: kworker/u4:3 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
RIP: 0010:do_chunk_alloc fs/btrfs/block-group.c:3509 [inline]
RIP: 0010:btrfs_chunk_alloc+0xc59/0x10a0 fs/btrfs/block-group.c:3732
Code: 49 be 00 00 00 00 00 fc ff df 0f 1f 44 00 00 e8 0d f5 0e fe eb 16 e8 06 f5 0e fe 48 c7 c7 60 4d 6d 8a 44 89 ee e8 27 2c 4a 06 <0f> 0b 4c 89 e7 48 c7 c6 60 5b 6d 8a ba b5 0d 00 00 e9 82 00 00 00
RSP: 0018:ffffc90002077990 EFLAGS: 00010246
RAX: dfcceef5261ee400 RBX: ffff888078518000 RCX: ffff88801d718000
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffc900020774c7 R09: 1ffff9200040ee98
R10: dffffc0000000000 R11: fffff5200040ee99 R12: ffff888073982bb0
R13: ffffffffffffffe4 R14: dffffc0000000000 R15: 00000000ffffffe4
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe2e92fb540 CR3: 000000002aa36000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 flush_space+0x447/0xc90 fs/btrfs/space-info.c:670
 btrfs_async_reclaim_metadata_space+0x26d/0x310 fs/btrfs/space-info.c:953
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>

Crashes (68):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/14 15:44 linux-5.15.y c86c4726e7f0 2130f682 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2025/12/03 01:19 linux-5.15.y cc5ec8769306 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2025/05/12 00:03 linux-5.15.y 3b8db0e4f263 77908e5f .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2024/07/12 08:30 linux-5.15.y f45bea23c39c eaeb5c15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/07/12 05:16 linux-5.15.y f45bea23c39c eaeb5c15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/05/20 04:52 linux-5.15.y 83655231580b c0f1611a .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2026/08/01 13:10 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2026/08/04 03:20 linux-5.15.y 6e2fd6534337 9451e17e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2026/08/03 13:59 linux-5.15.y 6e2fd6534337 6b7c9f71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2026/08/02 21:48 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2026/07/25 22:39 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2026/07/14 22:00 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2026/07/14 14:21 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2026/06/23 17:50 linux-5.15.y eceeec79dbc6 4b1d8f01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2026/03/18 02:07 linux-5.15.y 91d48252ad4b c8810548 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2026/02/19 02:37 linux-5.15.y e45d5d41c134 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2026/02/10 15:01 linux-5.15.y 7b232985052f 91d776d3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2026/02/10 02:36 linux-5.15.y 7b232985052f 4ab09a02 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2026/02/09 15:38 linux-5.15.y 7b232985052f df949cd9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2025/12/30 17:42 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2025/12/29 06:20 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2025/12/23 14:07 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2025/12/03 00:30 linux-5.15.y cc5ec8769306 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2025/02/22 22:00 linux-5.15.y c16c81c81336 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2025/02/11 02:16 linux-5.15.y c16c81c81336 43f51a00 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2025/02/10 23:31 linux-5.15.y c16c81c81336 43f51a00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2025/01/28 17:42 linux-5.15.y 003148680b79 f5427d7c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2025/01/09 21:09 linux-5.15.y 4735586da88e 9220929f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2025/01/09 21:08 linux-5.15.y 4735586da88e 9220929f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2025/01/04 00:04 linux-5.15.y 91786f140358 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2025/01/03 20:46 linux-5.15.y 91786f140358 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2025/01/01 00:11 linux-5.15.y 91786f140358 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2024/12/27 08:45 linux-5.15.y 91786f140358 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2024/12/26 15:53 linux-5.15.y 91786f140358 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2024/12/26 13:56 linux-5.15.y 91786f140358 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2024/12/23 23:43 linux-5.15.y 91786f140358 444551c4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2024/12/22 03:13 linux-5.15.y 91786f140358 d7f584ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2024/11/25 09:02 linux-5.15.y 0a51d2d4527b 68da6d95 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2024/11/14 11:39 linux-5.15.y 3c17fc483905 a8c99394 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2024/11/08 22:00 linux-5.15.y 3c17fc483905 6b856513 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2024/10/04 09:13 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2024/09/29 16:24 linux-5.15.y 3a5928702e71 ba29ff75 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2024/07/08 17:58 linux-5.15.y f45bea23c39c cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_chunk_alloc
2025/07/28 20:56 linux-5.15.y c79648372d02 6654ea9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2025/06/05 04:31 linux-5.15.y 1c700860e8bc 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/12/23 22:45 linux-5.15.y 91786f140358 444551c4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/12/12 04:50 linux-5.15.y 0a51d2d4527b 6f1b0fa8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/12/04 01:33 linux-5.15.y 0a51d2d4527b b50eb251 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/10/28 19:04 linux-5.15.y 74cdd62cb470 9efb3cc7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/07/10 04:27 linux-5.15.y f45bea23c39c bc144f9a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/07/10 04:26 linux-5.15.y f45bea23c39c bc144f9a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/07/10 04:26 linux-5.15.y f45bea23c39c bc144f9a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/07/09 17:15 linux-5.15.y f45bea23c39c 79d68ada .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/07/09 03:06 linux-5.15.y f45bea23c39c bc23a442 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/07/09 03:04 linux-5.15.y f45bea23c39c bc23a442 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/07/09 03:04 linux-5.15.y f45bea23c39c bc23a442 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/07/08 15:15 linux-5.15.y f45bea23c39c cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/07/06 01:19 linux-5.15.y f45bea23c39c 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/07/06 01:19 linux-5.15.y f45bea23c39c 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/07/01 18:33 linux-5.15.y 4878aadf2d15 b294e901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/06/19 06:28 linux-5.15.y 4878aadf2d15 41b7e219 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2024/06/19 06:28 linux-5.15.y 4878aadf2d15 41b7e219 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2023/09/25 21:25 linux-5.15.y b911329317b4 0b6a67ac .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
2023/09/25 19:34 linux-5.15.y b911329317b4 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_chunk_alloc
* Struck through repros no longer work on HEAD.