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WARNING in btrfs_create_pending_block_groups

Status: upstream: reported C repro on 2023/06/28 06:17
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+ecef109a157e70c06e25@syzkaller.appspotmail.com
First crash: 856d, last: 6h18m
Fix commit to backport (bisect log) :
tree: upstream
commit a1912f712188291f9d7d434fba155461f1ebef66
Author: Josef Bacik <josef@toxicpanda.com>
Date: Wed Nov 22 17:17:55 2023 +0000

  btrfs: remove code for inode_cache and recovery mount options

  
Fix bisection: the issue occurs on the latest tested release (bisect log)
Crash: WARNING in btrfs_create_pending_block_groups (log)
Repro: C syz .config
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2024/01/11 linux-5.15.y (ToT) 26c690eff0a5 C [report] WARNING in btrfs_create_pending_block_groups
2023/07/12 upstream (ToT) eb26cbb1a754 C [report] WARNING in btrfs_create_pending_block_groups
2024/01/11 upstream (ToT) de927f6c0b07 C Didn't crash
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in btrfs_create_pending_block_groups origin:upstream missing-backport -1 C inconclusive 424 5h54m 810d 0/3 upstream: reported C repro on 2023/08/13 16:14
upstream WARNING in btrfs_create_pending_block_groups (2) btrfs -1 C done 1198 5h48m 407d 0/29 upstream: reported C repro on 2024/09/19 23:50
upstream WARNING in btrfs_create_pending_block_groups btrfs -1 C error done 64 665d 1068d 0/29 auto-obsoleted due to no activity on 2024/05/26 09:44
linux-6.6 WARNING in btrfs_create_pending_block_groups origin:upstream -1 C 73 19h51m 127d 0/2 upstream: reported C repro on 2025/06/26 23:16
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2025/09/16 21:06 12m retest repro linux-5.15.y report log
2025/09/16 21:06 9m retest repro linux-5.15.y report log
2025/09/16 21:06 12m retest repro linux-5.15.y report log
2025/09/16 21:06 13m retest repro linux-5.15.y report log
2025/09/16 21:06 10m retest repro linux-5.15.y report log
2025/04/23 01:36 11m retest repro linux-5.15.y report log
2025/04/23 01:36 36m retest repro linux-5.15.y report log
2025/04/23 01:36 12m retest repro linux-5.15.y report log
2024/11/25 09:10 18m retest repro linux-5.15.y report log
2024/10/03 08:47 11m retest repro linux-5.15.y report log
▶ ▼ Fix bisection attempts (5)
Created Duration User Patch Repo Result
2024/01/11 17:12 3h57m fix candidate upstream OK (1) job log
2023/12/17 12:24 1h10m bisect fix linux-5.15.y OK (0) job log log
2023/11/17 09:26 1h08m bisect fix linux-5.15.y OK (0) job log log
2023/10/15 16:22 1h50m bisect fix linux-5.15.y OK (0) job log log
2023/09/11 08:10 1h00m bisect fix linux-5.15.y OK (0) job log log

Sample crash report:
BTRFS info (device loop0): has skinny extents
BTRFS info (device loop0): enabling ssd optimizations
BTRFS info (device loop0): balance: start -susage=34359738372,drange=7..526332,limit=0..6
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4308 at fs/btrfs/block-group.c:2441 btrfs_create_pending_block_groups+0xc1c/0xe50 fs/btrfs/block-group.c:2441
Modules linked in:
CPU: 1 PID: 4308 Comm: syz.0.17 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:btrfs_create_pending_block_groups+0xc1c/0xe50 fs/btrfs/block-group.c:2441
Code: 4c 1a fe eb 27 e8 b4 4c 1a fe 0f 1f 44 00 00 e8 aa 4c 1a fe eb 4a e8 a3 4c 1a fe 48 c7 c7 00 c4 4c 8a 44 89 fe e8 64 f0 3f 06 <0f> 0b 48 8b 7c 24 20 48 c7 c6 80 c4 4c 8a ba 89 09 00 00 44 89 f9
RSP: 0018:ffffc900031df780 EFLAGS: 00010246
RAX: 166704d8caae3900 RBX: 1ffff1100f821e0b RCX: ffff8880269ed940
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc900031df990 R08: dffffc0000000000 R09: ffffed1017224f24
R10: ffffed1017224f24 R11: 1ffff11017224f23 R12: ffff88807c10f1b0
R13: ffff88807c10f050 R14: ffff88807c10f058 R15: 00000000ffffffe4
FS:  000055556efd4500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f58db2e7b60 CR3: 000000007223f000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __btrfs_end_transaction+0x154/0x650 fs/btrfs/transaction.c:1016
 btrfs_inc_block_group_ro+0x59d/0x600 fs/btrfs/block-group.c:2664
 btrfs_relocate_block_group+0x418/0xd00 fs/btrfs/relocation.c:4041
 btrfs_relocate_chunk+0xaa/0x290 fs/btrfs/volumes.c:3338
 __btrfs_balance+0x1641/0x2250 fs/btrfs/volumes.c:4079
 btrfs_balance+0xd89/0x1520 fs/btrfs/volumes.c:4469
 btrfs_ioctl_balance+0x674/0x810 fs/btrfs/ioctl.c:4152
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f1e8d787be9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff6bafe058 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1e8d9aefa0 RCX: 00007f1e8d787be9
RDX: 0000200000000440 RSI: 00000000c4009420 RDI: 0000000000000003
RBP: 00007f1e8d80ae19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1e8d9aefa0 R14: 00007f1e8d9aefa0 R15: 0000000000000003
 </TASK>

Crashes (322):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/22 20:17 linux-5.15.y c79648372d02 bf27483f .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_create_pending_block_groups
2024/05/01 08:42 linux-5.15.y b925f60c6ee7 3ba885bc .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2023/06/28 06:17 linux-5.15.y f67653019430 4cd5bb25 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/05/10 03:26 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-arm64 WARNING in btrfs_create_pending_block_groups
2025/05/08 17:32 linux-5.15.y 16fdf2c7111b dbf35fa1 .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_create_pending_block_groups
2025/05/08 17:13 linux-5.15.y 16fdf2c7111b dbf35fa1 .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_create_pending_block_groups
2025/04/30 05:37 linux-5.15.y f7347f400572 85a5a23f .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_create_pending_block_groups
2025/01/12 22:57 linux-5.15.y 4735586da88e 6dbc6a9b .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_create_pending_block_groups
2024/11/10 21:52 linux-5.15.y 3c17fc483905 6b856513 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_create_pending_block_groups
2024/05/01 07:04 linux-5.15.y b925f60c6ee7 3ba885bc .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_create_pending_block_groups
2025/10/31 18:43 linux-5.15.y cc5ec8769306 2c50b6a9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/10/29 22:29 linux-5.15.y cc5ec8769306 fd2207e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/10/29 01:01 linux-5.15.y ac56c046adf4 fd2207e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/10/24 03:11 linux-5.15.y ac56c046adf4 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/10/21 22:37 linux-5.15.y ac56c046adf4 9832ed61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/10/16 13:58 linux-5.15.y 29e53a5b1c4f 19568248 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/10/16 04:32 linux-5.15.y 29e53a5b1c4f 19568248 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/10/13 23:02 linux-5.15.y 29e53a5b1c4f b6605ba8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/10/03 15:42 linux-5.15.y 29e53a5b1c4f 49379ee0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/10/01 07:24 linux-5.15.y 43bb85222e53 65a0eece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/09/28 08:55 linux-5.15.y 43bb85222e53 001c9061 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/08/29 09:01 linux-5.15.y 01879f56bdde d401b9d7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/08/22 11:11 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/08/11 02:11 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/08/10 09:24 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/08/05 08:41 linux-5.15.y c79648372d02 f5bcc8dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/08/05 03:43 linux-5.15.y c79648372d02 f5bcc8dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/08/04 02:41 linux-5.15.y c79648372d02 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/08/03 17:46 linux-5.15.y c79648372d02 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/08/02 20:41 linux-5.15.y c79648372d02 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/08/02 14:34 linux-5.15.y c79648372d02 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/07/30 09:34 linux-5.15.y c79648372d02 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/07/29 02:00 linux-5.15.y c79648372d02 6654ea9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/07/25 09:10 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/07/22 09:15 linux-5.15.y c79648372d02 1555463b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/07/19 22:13 linux-5.15.y c79648372d02 7117feec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/07/17 05:35 linux-5.15.y 89950c454265 44f8051e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/07/16 16:09 linux-5.15.y 89950c454265 124ec9cc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/07/13 04:26 linux-5.15.y 2f693b607545 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/07/12 01:28 linux-5.15.y 2f693b607545 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/07/09 18:23 linux-5.15.y 3dea0e7f549e f4e5e155 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/07/06 03:47 linux-5.15.y 3dea0e7f549e 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in btrfs_create_pending_block_groups
2025/08/25 17:52 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_create_pending_block_groups
2025/08/23 00:57 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_create_pending_block_groups
2025/08/07 05:06 linux-5.15.y c79648372d02 9a42d6b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_create_pending_block_groups
2025/08/06 05:11 linux-5.15.y c79648372d02 ffe1dd46 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_create_pending_block_groups
2025/08/04 00:48 linux-5.15.y c79648372d02 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_create_pending_block_groups
2025/08/01 07:18 linux-5.15.y c79648372d02 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_create_pending_block_groups
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_create_pending_block_groups
2025/07/21 00:38 linux-5.15.y c79648372d02 7117feec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_create_pending_block_groups
2025/07/12 11:16 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_create_pending_block_groups
2025/07/06 02:33 linux-5.15.y 3dea0e7f549e 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_create_pending_block_groups
2025/07/05 12:25 linux-5.15.y 3dea0e7f549e 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_create_pending_block_groups
* Struck through repros no longer work on HEAD.