linux-kernel - [BUG] infiniband: sw: rdmavt: possible ABBA deadlocks in rvt_ruc

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Message-ID: <afe67a8e-82b8-9a47-0832-527c652cc66e@gmail.com>
Date:   Thu, 20 Oct 2022 21:37:47 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     dennis.dalessandro@...nelisnetworks.com, jgg@...pe.ca,
        Leon Romanovsky <leon@...nel.org>
Cc:     linux-rdma@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: [BUG] infiniband: sw: rdmavt: possible ABBA deadlocks in
 rvt_ruc_loopback()

Hello,

My static analysis tool reports several possible ABBA deadlock in the 
rdmavt driver in Linux 5.18:

rvt_ruc_loopback()
   spin_lock_irqsave(&sqp->s_lock, flags); --> Line 3190 (Lock A)
   spin_lock(&sqp->r_lock); --> Line 3195 (Lock B)

rvt_qp_mr_clean()
   spin_lock_irq(&qp->r_lock); --> Line 698 (Lock B)
   spin_lock(&qp->s_lock); --> Line 700 (Lock A)

rvt_rc_timeout()
   spin_lock_irqsave(&qp->r_lock, flags); --> Line 2595 (Lock B)
   spin_lock(&qp->s_lock); --> Line 2596 (Lock A)

rvt_modify_qp()
   spin_lock_irq(&qp->r_lock); --> Line 1419 (Lock B)
   spin_lock(&qp->s_lock); --> Line 1421(Lock A)

_rvt_reset_qp()
   spin_lock_irq(&qp->r_lock); --> Line 907 (Lock B)
   spin_lock(&qp->s_lock); --> Line 909 (Lock A)

rvt_reset_qp()
   spin_lock_irq(&qp->r_lock); --> Line 936 (Lock B)
   spin_lock(&qp->s_lock); --> Line 938 (Lock A)

When rvt_ruc_loopback() is concurrently executed with rvt_qp_mr_clean(), 
rvt_rc_timeout(), rvt_modify_qp(), _rvt_reset_qp() or rvt_reset_qp(), 
the deadlocks can occur.

I am not quite sure whether these possible deadlocks are real and how to 
fix them if real.
Any feedback would be appreciated, thanks :)

Reported-by: TOTE Robot <oslab@...nghua.edu.cn>


Best wishes,
Jia-Ju Bai