public inbox for linux-btrfs@vger.kernel.org
 help / color / mirror / Atom feed
From: syzbot <syzbot+3c4d8371d65230f852a2@syzkaller.appspotmail.com>
To: clm@fb.com, dsterba@suse.com, linux-btrfs@vger.kernel.org,
	 linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: [syzbot] [btrfs?] BUG: corrupted list in btrfs_free_compr_folio
Date: Mon, 16 Mar 2026 06:40:28 -0700	[thread overview]
Message-ID: <69b8084c.050a0220.248e02.0115.GAE@google.com> (raw)

Hello,

syzbot found the following issue on:

HEAD commit:    f338e7738378 Linux 7.0-rc4
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15265602580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d46eab0cfd31c214
dashboard link: https://syzkaller.appspot.com/bug?extid=3c4d8371d65230f852a2
compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-f338e773.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2567fb35ebfb/vmlinux-f338e773.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f9124de81ddb/bzImage-f338e773.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3c4d8371d65230f852a2@syzkaller.appspotmail.com

list_add double add: new=ffffea00010a8488, prev=ffffffff9a43a948, next=ffffea00010a8488.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:37!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 1045 Comm: kworker/u4:8 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: btrfs-delalloc btrfs_work_helper
RIP: 0010:__list_add_valid_or_report+0xa5/0x130 lib/list_debug.c:35
Code: 74 12 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d e9 12 c6 f8 06 cc 48 c7 c7 e0 d7 27 8c 4c 89 fe 4c 89 f2 48 89 d9 e8 5c 49 6d fc 90 <0f> 0b 48 c7 c7 c0 d5 27 8c e8 4d 49 6d fc 90 0f 0b 48 c7 c7 80 d6
RSP: 0018:ffffc90000d6f800 EFLAGS: 00010246
RAX: 0000000000000058 RBX: ffffea00010a8488 RCX: 9af6677df2ed2e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 1ffffd4000215092 R08: ffffc90000d6f587 R09: 1ffff920001adeb0
R10: dffffc0000000000 R11: fffff520001adeb1 R12: 1ffffffff3487529
R13: dffffc0000000000 R14: ffffffff9a43a948 R15: ffffea00010a8488
FS:  0000000000000000(0000) GS:ffff88808ca55000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e37eb87168 CR3: 0000000041bd8000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __list_add_valid include/linux/list.h:96 [inline]
 __list_add include/linux/list.h:158 [inline]
 list_add include/linux/list.h:177 [inline]
 btrfs_free_compr_folio+0x1e1/0x340 fs/btrfs/compression.c:218
 cleanup_compressed_bio fs/btrfs/compression.h:150 [inline]
 btrfs_compress_bio+0x35a/0x6b0 fs/btrfs/compression.c:1047
 compress_file_range+0x8df/0x19b0 fs/btrfs/inode.c:1023
 btrfs_work_helper+0x38c/0xc80 fs/btrfs/async-thread.c:312
 process_one_work kernel/workqueue.c:3276 [inline]
 process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid_or_report+0xa5/0x130 lib/list_debug.c:35
Code: 74 12 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d e9 12 c6 f8 06 cc 48 c7 c7 e0 d7 27 8c 4c 89 fe 4c 89 f2 48 89 d9 e8 5c 49 6d fc 90 <0f> 0b 48 c7 c7 c0 d5 27 8c e8 4d 49 6d fc 90 0f 0b 48 c7 c7 80 d6
RSP: 0018:ffffc90000d6f800 EFLAGS: 00010246
RAX: 0000000000000058 RBX: ffffea00010a8488 RCX: 9af6677df2ed2e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 1ffffd4000215092 R08: ffffc90000d6f587 R09: 1ffff920001adeb0
R10: dffffc0000000000 R11: fffff520001adeb1 R12: 1ffffffff3487529
R13: dffffc0000000000 R14: ffffffff9a43a948 R15: ffffea00010a8488
FS:  0000000000000000(0000) GS:ffff88808ca55000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e37eb87168 CR3: 0000000041bd8000 CR4: 0000000000352ef0


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

             reply	other threads:[~2026-03-16 13:40 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-16 13:40 syzbot [this message]
2026-03-18 16:35 ` [syzbot] [btrfs?] BUG: corrupted list in btrfs_free_compr_folio David Sterba
2026-03-18 22:05   ` Aleksandr Nogikh

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=69b8084c.050a0220.248e02.0115.GAE@google.com \
    --to=syzbot+3c4d8371d65230f852a2@syzkaller.appspotmail.com \
    --cc=clm@fb.com \
    --cc=dsterba@suse.com \
    --cc=linux-btrfs@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=syzkaller-bugs@googlegroups.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox