Re: [PATCH] nbd: fix circular lock dependency

[Guilherme Giacomo Simoes <trintaeoitogc@gmail.com>]

Timo Joannin <timo.joannin@gmail.com> wrote:
> > Moving nbd_get_socket() makes this patch much larger than necessary,
> > which makes reviewing and backporting it harder. Adding a single
> > nbd_reclassify_socket(sock) call in nbd_genl_reconnect_sock_cb() right
> > after the nbd_get_socket() call is sufficient. 
> 
> Hi Guilherme and Bart,
> 
> Thanks for working on this! I'm currently fixing a possible deadlock
> in wg_ratelimiter_uninit 
> (Reported-by: syzbot+72fceb8393e04ce876d9@syzkaller.appspotmail.com)
> involving cpu_hotplug_lock and slab_mutex.
> 
> My one syzbot test failed because of this lockdep
> false positive that this patch addresses. I applied Bart's suggested 1-line
> fix locally, and will see if it resolves the false positive.
> I will be submitting my cpu_hotplug_lock fix separately.
> I am looking forward to see your v2!
> 
Cool, thanks