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WARNING in btrfs_put_block_group

Status: upstream: reported C repro on 2023/04/24 06:46
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+e38c6fff39c0d7d6f121@syzkaller.appspotmail.com
First crash: 978d, last: 4d01h
Cause bisection: introduced by (bisect log) [merge commit]:
commit f8566aa4f1766bb0267b7a0ed89c1d2c4a82ee1a
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sat Jul 1 18:40:01 2023 +0000

  Merge tag 'x86-urgent-2023-07-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Crash: WARNING in btrfs_put_block_group (log)
Repro: C syz .config
  
▶ ▼ Discussions (6)
Title Replies (including bot) Last reply
[syzbot] Monthly btrfs report (Oct 2025) 0 (1) 2025/10/27 12:50
[syzbot] Monthly btrfs report (Nov 2024) 0 (1) 2024/11/18 10:39
[syzbot] Monthly btrfs report (Oct 2024) 0 (1) 2024/10/17 07:41
[syzbot] Monthly btrfs report (Sep 2024) 0 (1) 2024/09/16 12:27
[syzbot] Monthly btrfs report (Jul 2024) 0 (1) 2024/07/15 14:03
[syzbot] [btrfs?] WARNING in btrfs_put_block_group 0 (2) 2023/11/07 15:19
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in btrfs_put_block_group origin:lts-only -1 C 75 1d14h 1002d 0/3 upstream: reported C repro on 2023/03/29 11:09
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2025/11/04 11:39 22m retest repro upstream OK log
2025/09/10 19:16 23m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2025/08/12 22:55 25m retest repro upstream report log
2025/08/10 19:11 26m retest repro upstream OK log
2025/05/16 13:52 53m retest repro upstream report log
2025/04/07 19:08 40m retest repro upstream report log
2025/02/01 13:21 24m retest repro upstream report log
2024/10/14 10:33 23m retest repro upstream report log
2024/05/31 19:23 4h48m retest repro upstream report log
2024/03/22 10:57 26m retest repro upstream error
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2024/08/04 08:49 2h25m bisect fix upstream OK (0) job log log
2024/01/05 18:36 5h18m bisect fix upstream OK (0) job log log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5952 at fs/btrfs/block-group.c:172 btrfs_put_block_group+0x2fb/0x350 fs/btrfs/block-group.c:172
Modules linked in:
CPU: 0 UID: 0 PID: 5952 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:btrfs_put_block_group+0x2fb/0x350 fs/btrfs/block-group.c:172
Code: 42 80 3c 20 00 74 08 48 89 df e8 00 99 34 fe bf 68 17 00 00 48 03 3b 48 89 de e8 f0 a0 01 00 e9 c0 fe ff ff e8 06 d5 ce fd 90 <0f> 0b 90 e9 84 fe ff ff e8 f8 d4 ce fd e9 7a fe ff ff e8 ee d4 ce
RSP: 0018:ffffc900040cfac0 EFLAGS: 00010293
RAX: ffffffff83f12eaa RBX: ffff8880788c3000 RCX: ffff88802faa5ac0
RDX: 0000000000000000 RSI: 0000000000002000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff88805f8edb77 R09: 1ffff1100bf1db6e
R10: dffffc0000000000 R11: ffffed100bf1db6f R12: dffffc0000000000
R13: ffff8880788c331c R14: 0000000000002000 R15: dffffc0000000000
FS:  000055558bcfa500(0000) GS:ffff888126138000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faab2552000 CR3: 0000000077588000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 btrfs_free_block_groups+0xb6b/0xf40 fs/btrfs/block-group.c:4568
 close_ctree+0x7bc/0x1380 fs/btrfs/disk-io.c:4426
 generic_shutdown_super+0x135/0x2c0 fs/super.c:642
 kill_anon_super+0x3b/0x70 fs/super.c:1288
 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2134
 deactivate_locked_super+0xbc/0x130 fs/super.c:473
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1318
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5b05390a77
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:00007ffc5be1e0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f5b05413d7d RCX: 00007f5b05390a77
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc5be1e180
RBP: 00007ffc5be1e180 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc5be1f210
R13: 00007f5b05413d7d R14: 000000000001ebb8 R15: 00007ffc5be1f250
 </TASK>

Crashes (178):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/11/30 13:25 upstream 6bda50f4333f d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-upstream-kasan-gce-root WARNING in btrfs_put_block_group
2025/08/14 06:20 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f5ae30d69d7 22ec1469 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-gce-arm64 WARNING in btrfs_put_block_group
2025/11/30 11:20 upstream 6bda50f4333f d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in btrfs_put_block_group
2025/11/17 02:53 upstream 7254a2b52279 f7988ea4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/11/05 08:02 upstream 284922f4c563 a6c9c731 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/10/20 12:13 upstream 211ddde0823f 1c8c8cd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/08/27 18:41 upstream fab1beda7597 e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in btrfs_put_block_group
2025/07/27 18:22 upstream ec2df4364666 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/07/19 11:51 upstream 4871b7cb27f4 7117feec .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/07/19 02:44 upstream d786aba32000 7117feec .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/07/04 12:48 upstream 4c06e63b9203 76ad128c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/07/04 02:38 upstream 17bbde2e1716 76ad128c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/06/22 14:59 upstream 739a6c93cc75 d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/06/08 10:55 upstream 8630c59e9936 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/05/30 15:19 upstream f66bc387efbe 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/05/28 14:18 upstream feacb1774bd5 874a1386 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/05/27 14:37 upstream 785cdec46e92 874a1386 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/05/20 01:54 upstream a5806cd506af b84f0537 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/05/02 11:41 upstream ebd297a2affa d7f099d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/04/26 20:32 upstream f1a3944c860b c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/04/22 13:22 upstream a33b5a08cbbd 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/04/22 12:15 upstream a33b5a08cbbd 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/04/14 14:07 upstream 8ffd015db85f 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/04/13 20:07 upstream 5aaaedb0cb54 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/04/13 16:24 upstream 5aaaedb0cb54 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/04/13 10:20 upstream 7cdabafc0012 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/04/12 12:40 upstream 3bde70a2c827 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/04/11 12:09 upstream 900241a5cc15 94486846 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/04/10 21:18 upstream 2eb959eeecc6 1ef3ab4d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/04/10 19:39 upstream 2eb959eeecc6 1ef3ab4d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/03/24 04:18 upstream 586de92313fc 875573af .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/03/24 00:17 upstream 586de92313fc 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/03/15 05:15 upstream a29967be967e e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/02/28 18:47 upstream 76544811c850 67cf5345 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/02/06 20:54 upstream 92514ef226f5 8002dd28 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/01/18 12:28 upstream 595523945be0 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/01/03 04:24 upstream 0bc21e701a6f d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/01/01 21:16 upstream 56e6a3499e14 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/01/01 17:20 upstream ccb98ccef0e5 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2024/05/02 15:22 upstream 0106679839f7 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in btrfs_put_block_group
2023/11/07 15:19 upstream be3ca57cfb77 83211397 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-root WARNING in btrfs_put_block_group
2024/06/07 13:18 upstream 8a92980606e3 c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in btrfs_put_block_group
2024/06/13 11:11 upstream 2ccbdf43d5e7 c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in btrfs_put_block_group
2023/04/22 11:33 upstream 8e41e0a57566 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_put_block_group
2025/07/02 08:11 linux-next 1343433ed389 ffe4b334 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in btrfs_put_block_group
2025/12/21 13:45 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f0b4cce4481 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in btrfs_put_block_group
2025/12/14 05:51 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 05c93f3395ed d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in btrfs_put_block_group
2025/10/07 10:40 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci bf45a62baffc 8ef35d49 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in btrfs_put_block_group
2025/10/05 20:39 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci bf45a62baffc 49379ee0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in btrfs_put_block_group
2025/08/24 09:19 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f5ae30d69d7 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in btrfs_put_block_group
2025/08/14 04:34 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f5ae30d69d7 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in btrfs_put_block_group
2025/07/11 09:44 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ec4801305969 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in btrfs_put_block_group
2025/05/23 03:27 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e fa44301a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in btrfs_put_block_group
2025/02/09 20:28 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 2014c95afece ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in btrfs_put_block_group
2025/01/06 23:27 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 573067a5a685 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in btrfs_put_block_group
* Struck through repros no longer work on HEAD.