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

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Message-ID: <000000000000b60b4e0609c9131b@google.com>
Date:   Fri, 10 Nov 2023 01:38:03 -0800
From:   syzbot <syzbot+4d81015bc10889fd12ea@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org, lizhi.xu@...driver.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [btrfs?] WARNING in create_pending_snapshot

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING: lock held when returning to user space in btrfs_ioctl_qgroup_create

BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE (0x1)
BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE_VALID (0x2)
BTRFS info (device loop0): checking UUID tree
================================================
WARNING: lock held when returning to user space!
6.6.0-syzkaller-15365-g305230142ae0-dirty #0 Not tainted
------------------------------------------------
syz-executor.0/5537 is leaving the kernel with locks still held!
3 locks held by syz-executor.0/5537:
 #0: ffff88806e8a2608 (sb_internal#2){.+.+}-{0:0}, at: btrfs_ioctl_qgroup_create+0x103/0x200 fs/btrfs/ioctl.c:3802
 #1: ffff888052082390 (btrfs_trans_num_writers){++++}-{0:0}, at: join_transaction+0x401/0xce0 fs/btrfs/transaction.c:294
 #2: ffff8880520823b8 (btrfs_trans_num_extwriters){++++}-{0:0}, at: join_transaction+0x401/0xce0 fs/btrfs/transaction.c:294


Tested on:

commit:         30523014 Merge tag 'pm-6.7-rc1-2' of git://git.kernel...
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=17cb5797680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=beb32a598fd79db9
dashboard link: https://syzkaller.appspot.com/bug?extid=4d81015bc10889fd12ea
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=11c9591f680000