WARNING in btrfs_remove_chunk (2)

Status: upstream: reported C repro on 2023/12/20 03:26
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+456f974c2381aae882ce@syzkaller.appspotmail.com
First crash: 1021d, last: 1d19h
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2026/10/04 upstream (ToT) 6addb4f38557 C [report] WARNING in btrfs_remove_chunk
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in btrfs_remove_chunk missing-backport origin:upstream -1 syz, C inconclusive 121 10d 1299d 0/3 upstream: reported C repro on 2023/03/17 14:37
linux-6.6 WARNING in btrfs_remove_chunk origin:upstream -1 syz, C error 7 17d 389d 0/2 upstream: reported C repro on 2025/09/12 10:19
upstream WARNING in btrfs_remove_chunk btrfs -1 syz, C error inconclusive 581 1d16h 1406d 0/29 upstream: reported C repro on 2022/11/30 08:16
linux-6.1 WARNING in btrfs_remove_chunk origin:lts-only -1 syz, C done 10 1195d 1285d 3/3 fixed on 2023/09/19 11:51
▶ ▼ Fix bisection attempts (5)
Created Duration User Patch Repo Result
2024/08/14 23:30 1m bisect fix linux-6.1.y error job log
2024/07/05 10:30 2h36m bisect fix linux-6.1.y OK (0) job log log
2024/05/26 08:28 2h18m bisect fix linux-6.1.y OK (0) job log log
2024/04/21 08:10 2h40m bisect fix linux-6.1.y OK (0) job log log
2024/03/19 23:32 2h40m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
BTRFS info (device loop4): balance: start -f -sconvert=raid0,usage=0..1342177280
BTRFS info (device loop4): relocating block group 1048576 flags system
------------[ cut here ]------------
WARNING: CPU: 1 PID: 6132 at fs/btrfs/volumes.c:3265 btrfs_remove_chunk+0x1502/0x1a10 fs/btrfs/volumes.c:3265
Modules linked in:
CPU: 1 PID: 6132 Comm: syz.4.328 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:btrfs_remove_chunk+0x1502/0x1a10 fs/btrfs/volumes.c:3265
Code: 48 c7 c7 20 6f d0 8a 44 89 f6 e8 69 2e d4 fd 0f 0b e9 76 fe ff ff e8 0d a7 08 fe 48 c7 c7 20 6f d0 8a 44 89 f6 e8 4e 2e d4 fd <0f> 0b e9 95 fe ff ff e8 f2 a6 08 fe 48 c7 c7 20 6f d0 8a 44 89 f6
RSP: 0018:ffffc90005acf900 EFLAGS: 00010246
RAX: 4e0c5f3d47ccad00 RBX: 0000000000000000 RCX: ffff88802a34bc00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc90005acfab0 R08: ffff8880b8f279db R09: 1ffff110171e4f3b
R10: dffffc0000000000 R11: ffffed10171e4f3c R12: 1ffff11003966960
R13: dffffc0000000000 R14: ffffffffffffffe4 R15: ffff8880788d4001
FS:  00007fd4ac3c46c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f837d14b000 CR3: 0000000027439000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_relocate_chunk+0x296/0x3b0 fs/btrfs/volumes.c:3395
 __btrfs_balance+0x187d/0x2200 fs/btrfs/volumes.c:4104
 btrfs_balance+0xc53/0x1120 fs/btrfs/volumes.c:4480
 btrfs_ioctl_balance+0x489/0x710 fs/btrfs/ioctl.c:4537
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd4ab59e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd4ac3c4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd4ab825fa0 RCX: 00007fd4ab59e159
RDX: 0000200000000780 RSI: 00000000c4009420 RDI: 0000000000000005
RBP: 00007fd4ab635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd4ab826038 R14: 00007fd4ab825fa0 R15: 00007ffdaeb4d038
 </TASK>

Crashes (83):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/07 06:30 linux-6.1.y cf82dcca9634 4f7b22a0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2025/08/25 01:02 linux-6.1.y 0bc96de781b4 bf27483f .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/06/01 03:26 linux-6.1.y da3c5173c55f 3d2f584d .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/02/16 20:01 linux-6.1.y 0cbb5f65e52f 40a34ec9 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2024/11/03 21:42 linux-6.1.y 7c15117f9468 f00eed24 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2024/02/18 21:40 linux-6.1.y 8b4118fabd6e 578f7538 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/09/11 01:11 linux-6.1.y f97f1002271b fdeaa69b .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2026/10/04 21:13 linux-6.1.y a500ba24937a 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2026/09/19 06:54 linux-6.1.y 1a8763b93150 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2026/09/07 02:21 linux-6.1.y cf82dcca9634 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2026/07/18 21:53 linux-6.1.y 090666d3cc90 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2026/06/24 02:15 linux-6.1.y fdb6fcb41cc7 042555ff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2026/06/22 20:05 linux-6.1.y fdb6fcb41cc7 5a630be6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2026/06/16 22:45 linux-6.1.y 228da13e907e a3998659 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2026/05/29 18:11 linux-6.1.y dcbcab9d7079 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2026/05/28 18:07 linux-6.1.y dcbcab9d7079 681715f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2026/04/02 15:19 linux-6.1.y 1989cd3d56e2 91bc79b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2025/11/17 21:38 linux-6.1.y f6e38ae624cf ef766cd7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2025/10/18 22:28 linux-6.1.y c2fda4b3f577 1c8c8cd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2025/09/18 13:31 linux-6.1.y 3db754f56897 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2025/09/12 03:23 linux-6.1.y 3db754f56897 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2025/09/11 04:37 linux-6.1.y f97f1002271b fdeaa69b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2025/09/05 21:39 linux-6.1.y 28c695c365e1 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2025/07/21 02:55 linux-6.1.y 3369c6df2fae 7117feec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2025/07/13 23:20 linux-6.1.y dfc486ec9cce 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2025/07/09 00:25 linux-6.1.y 04d1ccaa9c28 4d9fdfa4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2025/06/29 20:10 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2024/11/30 04:20 linux-6.1.y e4d90d63d385 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2024/11/30 04:16 linux-6.1.y e4d90d63d385 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2024/11/27 08:28 linux-6.1.y e4d90d63d385 52b38cc1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2024/11/23 01:40 linux-6.1.y e4d90d63d385 68da6d95 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in btrfs_remove_chunk
2026/06/24 17:45 linux-6.1.y fdb6fcb41cc7 302586aa .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2026/06/23 16:44 linux-6.1.y fdb6fcb41cc7 4b1d8f01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2026/06/21 20:29 linux-6.1.y fdb6fcb41cc7 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2026/06/20 02:02 linux-6.1.y fdb6fcb41cc7 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2026/04/13 19:08 linux-6.1.y 8e8fc038cad5 9530ccf9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2026/02/18 06:40 linux-6.1.y 8ce36b2849ef 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2026/02/14 08:13 linux-6.1.y 8ce36b2849ef 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2026/01/29 14:00 linux-6.1.y cd9b81672742 aeb6fdd5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2026/01/07 18:50 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/10/15 22:11 linux-6.1.y c2fda4b3f577 19568248 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/10/13 18:42 linux-6.1.y 882efbdd9d34 b6605ba8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/10/02 04:40 linux-6.1.y 7b34dc04e4ff 267f56c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/09/25 16:49 linux-6.1.y 7b34dc04e4ff 0abd0691 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/09/22 17:18 linux-6.1.y 363a599da6d9 0ac7291c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/09/16 11:44 linux-6.1.y 3db754f56897 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/09/15 03:11 linux-6.1.y 3db754f56897 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/09/09 11:38 linux-6.1.y 28c695c365e1 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/08/09 14:44 linux-6.1.y 3594f306da12 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/07/08 20:13 linux-6.1.y 04d1ccaa9c28 4d9fdfa4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/07/06 19:57 linux-6.1.y 04d1ccaa9c28 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/07/05 17:43 linux-6.1.y 7e69c33e4858 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/07/05 17:41 linux-6.1.y 7e69c33e4858 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2025/06/27 03:11 linux-6.1.y 58485ff1a74f 803ce19b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2024/11/26 09:50 linux-6.1.y e4d90d63d385 11dbc254 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2024/11/03 17:09 linux-6.1.y 7c15117f9468 f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2024/01/10 02:11 linux-6.1.y 38fb82ecd144 b438bd66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
2023/12/20 03:26 linux-6.1.y ba6f5fb46511 3ad490ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in btrfs_remove_chunk
* Struck through repros no longer work on HEAD.