linux-kernel - Re: [syzbot] [usb?] INFO: task hung in wdm

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Date: Thu, 20 Jun 2024 18:38:47 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+973d01eb49b060b12e63@...kaller.appspotmail.com>
Cc: gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Boqun Feng <boqun.feng@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-usb@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] INFO: task hung in wdm_release

On Thu, 20 Jun 2024 02:08:21 -0700
> Showing all locks held in the system:
> 3 locks held by kworker/u8:0/11:
>  #0: ffff8880b953e7d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
>  #1: ffff8880b9528948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:988
>  #2: ffff8880754f0768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5966 [inline]
>  #2: ffff8880754f0768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: cfg80211_wiphy_work+0x35/0x260 net/wireless/core.c:424

The info looks bogus given acquiring mutex with runqueue lock held.

static inline void wiphy_lock(struct wiphy *wiphy)
	__acquires(&wiphy->mtx)
{
	mutex_lock(&wiphy->mtx);
	__acquire(&wiphy->mtx);
}