Re: [PATCH] fixed rtnl deadlock from gtp

[Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>]

From: Daniel Yang <danielyangkang@xxxxxxxxx>
Date: Mon, 30 Sep 2024 18:55:54 -0700
> Fixes deadlock described in this bug:
> https://syzkaller.appspot.com/bug?extid=e953a8f3071f5c0a28fd.
> Specific crash report here:
> https://syzkaller.appspot.com/text?tag=CrashReport&x=14670e07980000.
> 
> DESCRIPTION OF ISSUE
> Deadlock: sk_lock-AF_INET --> &smc->clcsock_release_lock --> rtnl_mutex
> 
> rtnl_mutex->sk_lock-AF_INET
> rtnetlink_rcv_msg() acquires rtnl_lock() and calls rtnl_newlink(), which
> eventually calls gtp_newlink() which calls lock_sock() to attempt to
> acquire sk_lock.

Is the deadlock real ?