WARNING in btrfs_quota_enable

Status: upstream: reported C repro on 2026/11/11 10:02
Reported-by: syzbot+95498c834044912e5544@syzkaller.appspotmail.com
First crash: 2d03h, last: 2d03h
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in btrfs_quota_enable origin:upstream -1 syz, C error 8 19d 1085d 0/3 upstream: reported C repro on 2023/11/24 03:47
linux-6.1 WARNING in btrfs_quota_enable (2) -1 syz 3 7d04h 12d 0/3 upstream: reported syz repro on 2026/10/31 18:48
upstream WARNING in btrfs_quota_enable btrfs -1 1 1174d 1170d 0/29 auto-obsoleted due to no activity on 2023/12/05 05:27
linux-6.1 WARNING in btrfs_quota_enable -1 1 380d 380d 0/3 auto-obsoleted due to no activity on 2026/02/06 00:31
linux-4.19 WARNING in btrfs_quota_enable btrfs -1 syz, C error 4 1357d 1429d 0/1 upstream: reported C repro on 2022/12/15 10:06
upstream WARNING in btrfs_quota_enable (2) prio:low btrfs -1 17 3d04h 79d 0/29 upstream: reported on 2026/08/25 15:41

Sample crash report:
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: CPU: 0 PID: 7040 at fs/btrfs/qgroup.c:1048 btrfs_quota_enable+0x19bb/0x1b70 fs/btrfs/qgroup.c:1048
Modules linked in:
CPU: 0 PID: 7040 Comm: syz.2.196 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:btrfs_quota_enable+0x19bb/0x1b70 fs/btrfs/qgroup.c:1048
Code: 89 ff e8 78 e6 45 fe e9 1c e8 ff ff e8 be df fc 06 e8 d9 dc ec fd 48 c7 c7 a0 0b 2e 8b 4c 8b 6c 24 18 44 89 ee e8 75 81 b6 fd <0f> 0b e9 7d f7 ff ff e8 b9 dc ec fd 48 c7 c7 a0 0b 2e 8b be f4 ff
RSP: 0018:ffffc900038efcc0 EFLAGS: 00010246
RAX: 43f8aa658dd51500 RBX: 1ffff9200071dfa8 RCX: ffff88802ba09e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc900038efea0 R08: ffffc900038ef8c7 R09: 1ffff9200071df18
R10: dffffc0000000000 R11: fffff5200071df19 R12: ffff888030f28001
R13: ffffffffffffffe4 R14: 0000000000000000 R15: 1ffff1100e8abc8f
FS:  00007f5438c4a6c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4940dc6e9c CR3: 0000000022500000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 btrfs_ioctl_quota_ctl+0x13d/0x180 fs/btrfs/ioctl.c:3742
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5437da8f19
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:00007f5438c4a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5438026090 RCX: 00007f5437da8f19
RDX: 000020000000c180 RSI: 00000000c0109428 RDI: 0000000000000004
RBP: 00007f5437e37f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5438026128 R14: 00007f5438026090 R15: 00007ffdef3d1e98
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/11/11 10:02 linux-6.6.y 5139929c698c d3056657 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-6-kasan WARNING in btrfs_quota_enable
* Struck through repros no longer work on HEAD.