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WARNING in btrfs_space_info_update_bytes_may_use

Status: upstream: reported C repro on 2023/04/07 20:54
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+49f99b4e95c9e4a5516d@syzkaller.appspotmail.com
First crash: 941d, last: 6d08h
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2023/05/07 upstream (ToT) fc4354c6e5c2 C [report] WARNING in btrfs_space_info_update_bytes_may_use
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in btrfs_space_info_update_bytes_may_use btrfs -1 C done 4997 3h06m 1100d 0/29 upstream: reported C repro on 2022/10/31 00:15
linux-6.1 WARNING in btrfs_space_info_update_bytes_may_use origin:upstream -1 C error 221 2d02h 962d 0/3 upstream: reported C repro on 2023/03/18 05:35
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2025/10/29 00:09 12m retest repro linux-5.15.y report log
2025/10/29 00:09 13m retest repro linux-5.15.y report log
2025/10/29 00:09 14m retest repro linux-5.15.y report log
2025/10/29 00:09 10m retest repro linux-5.15.y report log
2025/10/13 14:54 9m retest repro linux-5.15.y report log
2025/09/28 23:22 14m retest repro linux-5.15.y report log
2025/09/13 12:29 15m retest repro linux-5.15.y report log
2025/09/13 12:29 13m retest repro linux-5.15.y report log
2025/09/13 12:29 10m retest repro linux-5.15.y report log
2025/08/26 17:00 48m retest repro linux-5.15.y report log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4303 at fs/btrfs/space-info.h:110 btrfs_space_info_update_bytes_may_use+0x2d3/0x5b0 fs/btrfs/space-info.h:110
Modules linked in:
CPU: 1 PID: 4303 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:btrfs_space_info_update_bytes_may_use+0x2d3/0x5b0 fs/btrfs/space-info.h:110
Code: 35 00 00 74 08 4c 89 ff e8 1a 66 5f fe 4d 8b 27 4c 89 e7 48 8b 6c 24 18 48 89 ee e8 d7 ff 1a fe 49 39 ec 73 1a e8 ed fd 1a fe <0f> 0b 31 db 43 80 7c 35 00 00 0f 85 6d ff ff ff e9 70 ff ff ff e8
RSP: 0018:ffffc9000325fb58 EFLAGS: 00010293
RAX: ffffffff835ccd33 RBX: fffffffffff30000 RCX: ffff88801b865940
RDX: 0000000000000000 RSI: 00000000000d0000 RDI: 00000000000cf000
RBP: 00000000000d0000 R08: dffffc0000000000 R09: fffffbfff1ad323e
R10: fffffbfff1ad323e R11: 1ffffffff1ad323d R12: 00000000000cf000
R13: 1ffff1100f984a0c R14: dffffc0000000000 R15: ffff88807cc25060
FS:  00005555712fc500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f395ca56830 CR3: 00000000228ab000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_space_info_free_bytes_may_use fs/btrfs/space-info.h:142 [inline]
 block_rsv_release_bytes fs/btrfs/block-rsv.c:151 [inline]
 btrfs_block_rsv_release+0x367/0x550 fs/btrfs/block-rsv.c:295
 btrfs_release_global_block_rsv+0x2f/0x250 fs/btrfs/block-rsv.c:451
 btrfs_free_block_groups+0x8c6/0xcc0 fs/btrfs/block-group.c:3988
 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+0xee/0x180 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: 0033:0x7fe070953ed7
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:00007fff5d0fd938 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fe0709d5c05 RCX: 00007fe070953ed7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff5d0fd9f0
RBP: 00007fff5d0fd9f0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff5d0fea80
R13: 00007fe0709d5c05 R14: 00000000000134f3 R15: 00007fff5d0feac0
 </TASK>

Crashes (43):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/09/14 08:45 linux-5.15.y 43bb85222e53 e2beed91 .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_space_info_update_bytes_may_use
2023/07/30 05:26 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 WARNING in btrfs_space_info_update_bytes_may_use
2023/04/30 22:30 linux-5.15.y f48aeeaaa64c 62df2017 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in btrfs_space_info_update_bytes_may_use
2025/01/26 19:07 linux-5.15.y 003148680b79 9fbd772e .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2024/12/02 10:15 linux-5.15.y 0a51d2d4527b 68914665 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2024/07/27 08:03 linux-5.15.y 7c6d66f0266f 46eb10b7 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2024/07/27 06:44 linux-5.15.y 7c6d66f0266f 46eb10b7 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2024/07/27 05:05 linux-5.15.y 7c6d66f0266f 46eb10b7 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2024/02/29 12:41 linux-5.15.y 458ce51d0356 352ab904 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2023/06/18 20:53 linux-5.15.y 471e639e59d1 f3921d4d .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2025/09/14 07:19 linux-5.15.y 43bb85222e53 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_space_info_update_bytes_may_use
2024/10/21 02:02 linux-5.15.y 584a40a22cb9 cd6fc0a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_space_info_update_bytes_may_use
2024/10/06 11:20 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_space_info_update_bytes_may_use
2023/11/02 02:49 linux-5.15.y 12952a23a5da 69904c9f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_space_info_update_bytes_may_use
2023/09/23 03:43 linux-5.15.y 35ecaa3632bf 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_space_info_update_bytes_may_use
2025/05/25 12:17 linux-5.15.y 98f47d0e9b8c ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2025/01/26 18:11 linux-5.15.y 003148680b79 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2025/01/11 15:10 linux-5.15.y 4735586da88e 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2025/01/11 15:09 linux-5.15.y 4735586da88e 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2025/01/11 15:07 linux-5.15.y 4735586da88e 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2025/01/11 15:07 linux-5.15.y 4735586da88e 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2025/01/11 15:04 linux-5.15.y 4735586da88e 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2024/12/02 09:17 linux-5.15.y 0a51d2d4527b 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2024/07/27 04:14 linux-5.15.y 7c6d66f0266f 46eb10b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2024/07/27 04:02 linux-5.15.y 7c6d66f0266f 46eb10b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2024/07/27 03:51 linux-5.15.y 7c6d66f0266f 46eb10b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2024/03/01 03:54 linux-5.15.y 458ce51d0356 352ab904 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2024/02/29 12:16 linux-5.15.y 458ce51d0356 352ab904 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2023/09/24 18:15 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_space_info_update_bytes_may_use
2023/07/19 04:30 linux-5.15.y d54cfc420586 022df2bb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_space_info_update_bytes_may_use
2023/04/16 07:17 linux-5.15.y 4fdad925aa1a ec410564 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_space_info_update_bytes_may_use
2023/08/11 03:21 linux-5.15.y c275eaaaa342 da3c3ef8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2023/07/30 13:38 linux-5.15.y 09996673e313 92476829 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2023/07/28 12:30 linux-5.15.y 09996673e313 92476829 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2023/07/28 04:59 linux-5.15.y 09996673e313 92476829 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2023/07/25 02:41 linux-5.15.y 5c6a716301d9 b03242d7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2023/06/29 20:44 linux-5.15.y 4af60700a60c 134ddc02 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2023/06/14 09:39 linux-5.15.y 7349e40704a0 d2ee9228 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2023/05/24 03:03 linux-5.15.y 9d6bde853685 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2023/04/22 17:25 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_space_info_update_bytes_may_use
2023/04/09 02:55 linux-5.15.y d86dfc4d95cd 71147e29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2023/04/09 00:30 linux-5.15.y d86dfc4d95cd 71147e29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_space_info_update_bytes_may_use
2023/04/07 20:54 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_space_info_update_bytes_may_use
* Struck through repros no longer work on HEAD.