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WARNING in btrfs_put_block_group

Status: upstream: reported C repro on 2023/03/29 11:09
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+f2508933db18c09bc224@syzkaller.appspotmail.com
First crash: 929d, last: 6d06h
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/09/08 linux-5.15.y (ToT) 7a6c2d093c45 C [report] WARNING in btrfs_put_block_group
2025/09/08 upstream (ToT) f777d1112ee5 C Didn't crash
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in btrfs_put_block_group btrfs -1 C unreliable 167 6d20h 904d 0/29 upstream: reported C repro on 2023/04/24 06:46
▶ ▼ Last patch testing requests (8)
Created Duration User Patch Repo Result
2025/09/25 08:01 10m retest repro linux-5.15.y report log
2025/09/25 08:01 14m retest repro linux-5.15.y report log
2025/07/30 04:39 18m retest repro linux-5.15.y report log
2025/07/30 04:39 12m retest repro linux-5.15.y report log
2025/07/30 04:39 19m retest repro linux-5.15.y report log
2025/07/30 04:39 11m retest repro linux-5.15.y report log
2025/07/30 04:39 11m retest repro linux-5.15.y report log
2025/07/07 16:19 13m retest repro linux-5.15.y report log

Sample crash report:
BTRFS info (device loop0): at unmount dio bytes count 45056
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4295 at fs/btrfs/block-group.c:142 btrfs_put_block_group+0x269/0x280 fs/btrfs/block-group.c:142
Modules linked in:
CPU: 0 PID: 4295 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:btrfs_put_block_group+0x269/0x280 fs/btrfs/block-group.c:142
Code: bd 1f 5f fe bf c8 15 00 00 48 03 3b 48 89 de e8 cd 4a 01 00 e9 4a ff ff ff e8 73 b9 1a fe 0f 0b e9 6a ff ff ff e8 67 b9 1a fe <0f> 0b e9 04 ff ff ff e8 5b b9 1a fe e9 fa fe ff ff 66 0f 1f 44 00
RSP: 0018:ffffc9000316fc18 EFLAGS: 00010293
RAX: ffffffff835d1149 RBX: ffff888076994000 RCX: ffff88802b048000
RDX: 0000000000000000 RSI: 000000000000b000 RDI: 0000000000000000
RBP: 0000000000000001 R08: dffffc0000000000 R09: ffffed100c0d7b3b
R10: ffffed100c0d7b3b R11: 1ffff1100c0d7b3a R12: ffff888076994310
R13: ffff888076994000 R14: 000000000000b000 R15: dffffc0000000000
FS:  000055555b3a5500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bde58cd5f8 CR3: 0000000060e50000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_free_block_groups+0x803/0xcc0 fs/btrfs/block-group.c:3982
 close_ctree+0x706/0x8c0 fs/btrfs/disk-io.c:4528
 generic_shutdown_super+0x130/0x300 fs/super.c:475
 kill_anon_super+0x36/0x70 fs/super.c:1089
 btrfs_kill_super+0x3d/0x50 fs/btrfs/super.c:2390
 deactivate_locked_super+0x93/0xf0 fs/super.c:335
 cleanup_mnt+0x418/0x4d0 fs/namespace.c:1139
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f1b07181f17
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffed8cc5548 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f1b07203c05 RCX: 00007f1b07181f17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffed8cc5600
RBP: 00007ffed8cc5600 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffed8cc6690
R13: 00007f1b07203c05 R14: 0000000000032086 R15: 00007ffed8cc66d0
 </TASK>

Crashes (71):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/09/02 05:54 linux-5.15.y 01879f56bdde 807a3b61 .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_put_block_group
2025/06/07 20:29 linux-5.15.y 1c700860e8bc 4826c28e .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2024/11/18 21:15 linux-5.15.y 0a51d2d4527b e7bb5d6e .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2024/05/10 21:55 linux-5.15.y 284087d4f7d5 f7c35481 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2024/01/29 06:14 linux-5.15.y 6139f2a02fe0 cc4a4020 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/07/27 23:53 linux-5.15.y 09996673e313 92476829 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/03/30 04:07 linux-5.15.y 115472395b0a f325deb0 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/07/15 00:46 linux-5.15.y d54cfc420586 35d9ecc5 .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2025/10/08 00:33 linux-5.15.y 29e53a5b1c4f 7e2882b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_put_block_group
2024/05/01 21:26 linux-5.15.y b925f60c6ee7 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_put_block_group
2024/04/26 15:53 linux-5.15.y c52b9710c83d 059e9963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_put_block_group
2024/04/13 22:08 linux-5.15.y fa3df276cd36 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_put_block_group
2024/03/07 07:54 linux-5.15.y 574362648507 f39a7eed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_put_block_group
2023/10/15 01:19 linux-5.15.y 02e21884dcf2 f757a323 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_put_block_group
2023/09/14 14:06 linux-5.15.y aff03380bda4 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_put_block_group
2025/07/14 04:22 linux-5.15.y 2f693b607545 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2025/06/08 02:59 linux-5.15.y 1c700860e8bc 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2025/05/29 12:50 linux-5.15.y 98f47d0e9b8c 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2025/05/02 06:05 linux-5.15.y f7347f400572 51b137cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2025/04/04 07:21 linux-5.15.y 0c935c049b5c d7ae3a11 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2025/01/04 22:00 linux-5.15.y 91786f140358 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2024/11/18 14:24 linux-5.15.y 0a51d2d4527b e7bb5d6e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2024/05/09 23:48 linux-5.15.y 284087d4f7d5 05079661 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2024/05/07 12:38 linux-5.15.y 284087d4f7d5 cb2dcc0e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2024/05/06 17:53 linux-5.15.y 284087d4f7d5 d884b519 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2024/05/06 12:24 linux-5.15.y 284087d4f7d5 d884b519 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2024/05/06 02:57 linux-5.15.y 284087d4f7d5 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2024/04/26 12:13 linux-5.15.y c52b9710c83d 059e9963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2024/04/24 17:23 linux-5.15.y c52b9710c83d 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2024/04/06 10:37 linux-5.15.y 9465fef4ae35 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2024/04/05 19:47 linux-5.15.y 9465fef4ae35 77230c29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2024/04/01 13:47 linux-5.15.y 9465fef4ae35 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2024/03/27 08:54 linux-5.15.y 9465fef4ae35 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/08/18 06:00 linux-5.15.y f6f7927ac664 74b106b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/08/09 19:54 linux-5.15.y c275eaaaa342 13ca4cd6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/08/09 03:48 linux-5.15.y c275eaaaa342 8ad1a287 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/08/09 00:32 linux-5.15.y c275eaaaa342 9552ae77 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/08/08 08:07 linux-5.15.y 38d4ca22a528 b1b6ae3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/07/25 16:34 linux-5.15.y 5c6a716301d9 6756545c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/07/23 15:53 linux-5.15.y cdd3cdb682f4 27cbe77f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/07/23 10:44 linux-5.15.y d54cfc420586 27cbe77f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/07/22 08:41 linux-5.15.y d54cfc420586 27cbe77f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/07/22 07:25 linux-5.15.y d54cfc420586 27cbe77f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/07/19 22:25 linux-5.15.y d54cfc420586 4547cdf9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/07/19 21:22 linux-5.15.y d54cfc420586 4547cdf9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/07/18 17:34 linux-5.15.y d54cfc420586 022df2bb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/07/17 16:39 linux-5.15.y d54cfc420586 20f8b3c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/07/17 13:28 linux-5.15.y d54cfc420586 20f8b3c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/07/16 09:03 linux-5.15.y d54cfc420586 35d9ecc5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/07/14 23:35 linux-5.15.y d54cfc420586 35d9ecc5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/07/13 19:51 linux-5.15.y d54cfc420586 55eda22f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/06/20 12:25 linux-5.15.y 471e639e59d1 09ffe269 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/06/13 04:16 linux-5.15.y 7349e40704a0 749afb64 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/06/06 00:00 linux-5.15.y d7af3e5ba454 a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/05/31 15:52 linux-5.15.y 0ab06468cbd1 09898419 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/05/26 22:57 linux-5.15.y 1fe619a7d252 cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/05/05 19:39 linux-5.15.y 8a7f2a5c5aa1 de870ca5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/05/04 08:05 linux-5.15.y 8a7f2a5c5aa1 5b7ff9dd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/05/01 13:44 linux-5.15.y 8a7f2a5c5aa1 62df2017 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/04/29 01:18 linux-5.15.y f48aeeaaa64c 62df2017 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/04/28 13:27 linux-5.15.y f48aeeaaa64c 70a605de .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/04/27 00:30 linux-5.15.y f48aeeaaa64c 19a3dabe .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/04/25 16:46 linux-5.15.y 3299fb36854f 65320f8e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/04/21 01:39 linux-5.15.y 3299fb36854f 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/04/20 04:57 linux-5.15.y 4fdad925aa1a a219f34e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/04/16 07:09 linux-5.15.y 4fdad925aa1a ec410564 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/04/07 11:50 linux-5.15.y d86dfc4d95cd f7ba566d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
2023/03/29 11:08 linux-5.15.y 115472395b0a f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_put_block_group
* Struck through repros no longer work on HEAD.