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Sat, 31 Oct 2026 06:30:41 -0700 (PDT) Date: Sat, 31 Oct 2026 06:30:41 -0700 In-Reply-To: <6a791c94.01d0871a.3a0d52.009a.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ae5ed81.041e992e.a2316.0006.GAE@google.com> Subject: Re: [syzbot] [btrfs?] WARNING in __add_block_group_free_space From: syzbot To: clm@fb.com, dsterba@suse.com, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 36aad21d50d1 Merge tag 'ksmbd-for-7.4-rc1-part2' of git://.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=113b8959580000 kernel config: https://syzkaller.appspot.com/x/.config?x=94cb1a71158c9027 dashboard link: https://syzkaller.appspot.com/bug?extid=6931616d57696102d8aa compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=147bccb1580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6931616d57696102d8aa@syzkaller.appspotmail.com ------------[ cut here ]------------ btrfs_abort_should_print_stack(__error) WARNING: fs/btrfs/free-space-tree.c:1446 at __add_block_group_free_space+0x5a3/0x5b0 fs/btrfs/free-space-tree.c:1446, CPU#0: kworker/u4:7/185 Modules linked in: CPU: 0 UID: 0 PID: 185 Comm: kworker/u4:7 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: events_unbound btrfs_async_reclaim_data_space RIP: 0010:__add_block_group_free_space+0x5a3/0x5b0 fs/btrfs/free-space-tree.c:1446 Code: 07 38 c1 0f 8c ce fc ff ff 4c 89 f7 e8 66 3c f5 fd e9 c1 fc ff ff e8 cc 98 7c fd eb 10 e8 c5 98 7c fd eb 09 e8 be 98 7c fd 90 <0f> 0b 90 44 89 e1 f7 d9 e9 51 fe ff ff 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90001a7f578 EFLAGS: 00010293 RAX: ffffffff844c8872 RBX: ffff888013790001 RCX: ffff888034dc0000 RDX: 0000000000000000 RSI: ffffffff9081ef80 RDI: 00000000ffffffe4 RBP: ffff888037aea758 R08: ffff888034dc0000 R09: 0000000000000003 R10: 00000000fffffffb R11: 0000000000000000 R12: 00000000ffffffe4 R13: ffff88801377d000 R14: ffff888037aea7b8 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88808aa01000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4b3d8dd080 CR3: 0000000041dd5000 CR4: 0000000000352ef0 Call Trace: btrfs_add_block_group_free_space+0xd0/0x130 fs/btrfs/free-space-tree.c:1471 btrfs_create_pending_block_groups+0xcc6/0x15e0 fs/btrfs/block-group.c:2942 __btrfs_end_transaction+0x140/0x640 fs/btrfs/transaction.c:1119 flush_space+0x3e9/0xde0 fs/btrfs/space-info.c:912 do_async_reclaim_data_space+0x137/0x550 fs/btrfs/space-info.c:1455 btrfs_async_reclaim_data_space+0x41/0x90 fs/btrfs/space-info.c:1519 process_one_work kernel/workqueue.c:3495 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.