linux-kernel - Re: [syzbot] [btrfs?] WARNING in btrfs_put_block

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Message-ID: <0000000000002775cd0609917f4f@google.com>
Date:   Tue, 07 Nov 2023 07:19:28 -0800
From:   syzbot <syzbot+e38c6fff39c0d7d6f121@...kaller.appspotmail.com>
To:     clm@...com, dsterba@...e.com, josef@...icpanda.com,
        linux-btrfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [btrfs?] WARNING in btrfs_put_block_group

syzbot has found a reproducer for the following issue on:

HEAD commit:    be3ca57cfb77 Merge tag 'media/v6.7-1' of git://git.kernel...
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11163cdf680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1ffa1cec3b40f3ce
dashboard link: https://syzkaller.appspot.com/bug?extid=e38c6fff39c0d7d6f121
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11f3c760e80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1110877f680000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9e42e209afb1/disk-be3ca57c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/faad7e361a8e/vmlinux-be3ca57c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/56d812634b0d/bzImage-be3ca57c.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/2e2950f94580/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e38c6fff39c0d7d6f121@...kaller.appspotmail.com

BTRFS info (device loop2): at unmount dio bytes count 45056
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5067 at fs/btrfs/block-group.c:159 btrfs_put_block_group fs/btrfs/block-group.c:159 [inline]
WARNING: CPU: 0 PID: 5067 at fs/btrfs/block-group.c:159 btrfs_put_block_group+0x2c9/0x330 fs/btrfs/block-group.c:146
Modules linked in:
CPU: 0 PID: 5067 Comm: syz-executor383 Not tainted 6.6.0-syzkaller-15029-gbe3ca57cfb77 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
RIP: 0010:btrfs_put_block_group fs/btrfs/block-group.c:159 [inline]
RIP: 0010:btrfs_put_block_group+0x2c9/0x330 fs/btrfs/block-group.c:146
Code: 48 8d b8 e0 15 00 00 e8 f5 70 01 00 e9 b8 fe ff ff e8 db ca 43 fe e9 1f fe ff ff e8 d1 ca 43 fe e9 d7 fd ff ff e8 07 da ec fd <0f> 0b e9 61 fe ff ff e8 bb ca 43 fe e9 b5 fe ff ff e8 b1 ca 43 fe
RSP: 0018:ffffc90003a1fb48 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888026356000 RCX: ffffffff839bc0d8
RDX: ffff888061868000 RSI: ffffffff839bc279 RDI: 0000000000000007
RBP: 000000000000b000 R08: 0000000000000007 R09: 0000000000000000
R10: 000000000000b000 R11: 1ffff11004f89c32 R12: ffff888060c28000
R13: 0000000000000001 R14: ffff888026356160 R15: ffff888026356000
FS:  0000555556d0c380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7172fd2100 CR3: 000000007ef04000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 btrfs_free_block_groups+0x9f5/0x13d0 fs/btrfs/block-group.c:4360
 close_ctree+0x8c4/0xdd0 fs/btrfs/disk-io.c:4389
 generic_shutdown_super+0x161/0x3c0 fs/super.c:696
 kill_anon_super+0x3a/0x60 fs/super.c:1295
 btrfs_kill_super+0x3b/0x50 fs/btrfs/super.c:2097
 deactivate_locked_super+0xbc/0x1a0 fs/super.c:484
 deactivate_super+0xde/0x100 fs/super.c:517
 cleanup_mnt+0x222/0x450 fs/namespace.c:1256
 task_work_run+0x14d/0x240 kernel/task_work.c:180
 ptrace_notify+0x10c/0x130 kernel/signal.c:2399
 ptrace_report_syscall include/linux/ptrace.h:411 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:473 [inline]
 syscall_exit_work kernel/entry/common.c:251 [inline]
 syscall_exit_to_user_mode_prepare+0x120/0x220 kernel/entry/common.c:278
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0xd/0x60 kernel/entry/common.c:296
 do_syscall_64+0x4b/0x110 arch/x86/entry/common.c:88
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f7172f56677
Code: 07 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffe85c2eed8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000020373 RCX: 00007f7172f56677
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffe85c2ef90
RBP: 00007ffe85c2ef90 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffe85c30000
R13: 0000555556d0d6c0 R14: 431bde82d7b634db R15: 00007ffe85c30020
 </TASK>


---
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.