syzbot


WARNING in lookup_inline_extent_backref

Status: fixed on 2024/01/01 13:36
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+1fb409aedaee6e2bf793@syzkaller.appspotmail.com
Fix commit: 56f762659a5e btrfs: do not allow non subvolume root targets for snapshot
First crash: 546d, last: 378d
Fix bisection: fixed by (bisect log) :
commit 56f762659a5e9fde8220a88e19fd5ec4b12eda6d
Author: Josef Bacik <josef@toxicpanda.com>
Date: Fri Dec 15 15:01:44 2023 +0000

  btrfs: do not allow non subvolume root targets for snapshot

  
Bug presence (1)
Date Name Commit Repro Result
2023/06/18 upstream (ToT) 1b29d271614a C [report] WARNING in lookup_inline_extent_backref
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in lookup_inline_extent_backref origin:lts-only C done 5 505d 623d 0/3 auto-obsoleted due to no activity on 2024/10/04 17:22
upstream WARNING in lookup_inline_extent_backref btrfs C error inconclusive 303 30d 740d 0/28 upstream: reported C repro on 2022/12/05 08:13
Fix bisection attempts (5)
Created Duration User Patch Repo Result
2024/01/01 02:07 5h03m bisect fix linux-6.1.y OK (1) job log
2023/12/01 19:42 1h48m bisect fix linux-6.1.y OK (0) job log log
2023/10/31 20:24 1h42m bisect fix linux-6.1.y OK (0) job log log
2023/10/01 06:10 1h55m bisect fix linux-6.1.y OK (0) job log log
2023/07/31 17:51 3h19m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 3698 at fs/btrfs/extent-tree.c:865 lookup_inline_extent_backref+0x8b3/0x13e0
Modules linked in:
CPU: 0 PID: 3698 Comm: syz-executor283 Not tainted 6.1.34-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:lookup_inline_extent_backref+0x8b3/0x13e0 fs/btrfs/extent-tree.c:865
Code: de e8 51 19 09 fe 49 39 df 0f 87 f0 0a 00 00 e8 63 17 09 fe eb 30 83 7d 28 00 4c 8b 6c 24 28 0f 84 92 04 00 00 e8 4d 17 09 fe <0f> 0b 41 bc fb ff ff ff e9 d3 05 00 00 e8 3b 17 09 fe e9 aa 05 00
RSP: 0018:ffffc9000444eee0 EFLAGS: 00010293
RAX: ffffffff8380be03 RBX: 0000000000000000 RCX: ffff888013ae5940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000444f090 R08: ffffffff8380b96e R09: ffffc9000444ec40
R10: ffffffffffffffff R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff8880766a70b0 R14: ffffc9000444f000 R15: ffff888072ce6000
FS:  00007fdbb854b700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020003000 CR3: 000000001e767000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 insert_inline_extent_backref+0xe2/0x250 fs/btrfs/extent-tree.c:1152
 __btrfs_inc_extent_ref+0x11f/0x5f0 fs/btrfs/extent-tree.c:1455
 btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:1948 [inline]
 __btrfs_run_delayed_refs+0x11bf/0x41b0 fs/btrfs/extent-tree.c:2011
 btrfs_run_delayed_refs+0x2f5/0x480 fs/btrfs/extent-tree.c:2142
 qgroup_account_snapshot fs/btrfs/transaction.c:1538 [inline]
 create_pending_snapshot+0x11de/0x2d40 fs/btrfs/transaction.c:1800
 create_pending_snapshots+0x195/0x1d0 fs/btrfs/transaction.c:1868
 btrfs_commit_transaction+0x1497/0x37e0 fs/btrfs/transaction.c:2336
 create_snapshot+0x4a5/0x7e0 fs/btrfs/ioctl.c:835
 btrfs_mksubvol+0x62e/0x760 fs/btrfs/ioctl.c:985
 btrfs_mksnapshot+0xb5/0xf0 fs/btrfs/ioctl.c:1031
 __btrfs_ioctl_snap_create+0x338/0x450 fs/btrfs/ioctl.c:2186
 btrfs_ioctl_snap_create+0x136/0x190 fs/btrfs/ioctl.c:2213
 btrfs_ioctl+0x15c/0xc10
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fdbbf9c0db9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 15 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fdbb854b2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdbbfa4b7f0 RCX: 00007fdbbf9c0db9
RDX: 0000000020002180 RSI: 0000000050009401 RDI: 0000000000000007
RBP: 00007fdbbfa1868c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0030656c69662f2e
R13: 00007fdbbfa17690 R14: 2a63d28a7f685400 R15: 00007fdbbfa4b7f8
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/17 14:35 linux-6.1.y ca87e77a2ef8 f3921d4d .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan WARNING in lookup_inline_extent_backref
2023/06/17 12:14 linux-6.1.y ca87e77a2ef8 f3921d4d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in lookup_inline_extent_backref
* Struck through repros no longer work on HEAD.