Re: [syzbot] general protection fault in btrfs_stop_all_workers

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+a2c720e0f056114ea7c6@xxxxxxxxxxxxxxxxxxxxxxxxx

Tested on:

commit:         ade4dbbb btrfs: don't call destroy_workqueue on NULL w..
git tree:       git://git.infradead.org/users/hch/misc.git btrfs-workqueue-fix
kernel config:  https://syzkaller.appspot.com/x/.config?x=17dad21e0facb5e6
dashboard link: https://syzkaller.appspot.com/bug?extid=a2c720e0f056114ea7c6
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.