linux-kernel - [syzbot] [btrfs?] WARNING in btrfs_release_global_block

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Message-ID: <000000000000cf826706067d18fd@google.com>
Date:   Fri, 29 Sep 2023 03:43:37 -0700
From:   syzbot <syzbot+10e8dae9863cb83db623@...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: [syzbot] [btrfs?] WARNING in btrfs_release_global_block_rsv

Hello,

syzbot found the following issue on:

HEAD commit:    8a511e7efc5a Merge tag 'for-linus' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=133af832680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d594086f139d167
dashboard link: https://syzkaller.appspot.com/bug?extid=10e8dae9863cb83db623
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/943dcd094ce2/disk-8a511e7e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8647d59633ee/vmlinux-8a511e7e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9c6b0fed6523/bzImage-8a511e7e.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+10e8dae9863cb83db623@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 5077 at fs/btrfs/block-rsv.c:451 btrfs_release_global_block_rsv+0x279/0x2e0 fs/btrfs/block-rsv.c:451
Modules linked in:
CPU: 0 PID: 5077 Comm: syz-executor.0 Not tainted 6.6.0-rc2-syzkaller-00414-g8a511e7efc5a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
RIP: 0010:btrfs_release_global_block_rsv+0x279/0x2e0 fs/btrfs/block-rsv.c:451
Code: ff e8 bb ff ef fd 0f 0b e9 c9 fe ff ff e8 af ff ef fd 0f 0b e9 fe fe ff ff e8 a3 ff ef fd 0f 0b e9 33 ff ff ff e8 97 ff ef fd <0f> 0b e9 68 ff ff ff e8 8b ff ef fd 0f 0b 5b 5d e9 82 ff ef fd e8
RSP: 0018:ffffc90003c7fb78 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88807a310000 RCX: 0000000000000000
RDX: ffff888026559dc0 RSI: ffffffff8397c729 RDI: 0000000000000007
RBP: 000000000000e000 R08: 0000000000000007 R09: 0000000000000000
R10: 000000000000e000 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff888067b4a160 R15: ffff888067b4a000
FS:  000055555730c480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005557ad94b4e8 CR3: 000000003865f000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 btrfs_free_block_groups+0xbb6/0x13d0 fs/btrfs/block-group.c:4380
 close_ctree+0x8c4/0xdd0 fs/btrfs/disk-io.c:4413
 generic_shutdown_super+0x161/0x3c0 fs/super.c:693
 kill_anon_super+0x3a/0x60 fs/super.c:1292
 btrfs_kill_super+0x3b/0x50 fs/btrfs/super.c:2144
 deactivate_locked_super+0x9a/0x170 fs/super.c:481
 deactivate_super+0xde/0x100 fs/super.c:514
 cleanup_mnt+0x222/0x3d0 fs/namespace.c:1254
 task_work_run+0x14d/0x240 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x215/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:296
 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7faf3687de17
Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffe2bf9fec8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007faf3687de17
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffe2bf9ff80
RBP: 00007ffe2bf9ff80 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe2bfa1040
R13: 00007faf368c73b9 R14: 00000000001a2e26 R15: 0000000000000018
 </TASK>


---
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