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Date: Wed, 15 Sep 2021 17:12:40 +0800 From: Jia-Ju Bai <baijiaju1990@...il.com> To: mike.marciniszyn@...nelisnetworks.com, dennis.dalessandro@...nelisnetworks.com, dledford@...hat.com, jgg@...pe.ca Cc: linux-rdma@...r.kernel.org, linux-kernel <linux-kernel@...r.kernel.org> Subject: [BUG] infiniband: hw: hfi1: possible ABBA deadlock in pio_wait() and sc_disable() Hello, My static analysis tool reports a possible ABBA deadlock in the hfi1 driver in Linux 5.10: sc_disable() write_seqlock(&sc->waitlock); --> Line 956 (Lock A) hfi1_qp_wakeup() spin_lock_irqsave(&qp->s_lock, flags); --> Line 441 (Lock B) pio_wait() spin_lock_irqsave(&qp->s_lock, flags); --> Line 939 (Lock B) write_seqlock(&sc->waitlock); --> Line 941 (Lock A) When sc_disable() and pio_wait() are concurrently executed, the deadlock can occur. I am not quite sure whether this possible deadlock is real and how to fix it if it is real. Any feedback would be appreciated, thanks :) Reported-by: TOTE Robot <oslab@...nghua.edu.cn> Best wishes, Jia-Ju Bai
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