From: Jin Huang via lttng-dev <lttng-dev@lists.lttng.org>
To: lttng-dev@lists.lttng.org
Subject: [lttng-dev] [URCU]Bug Report
Date: Fri, 14 Aug 2020 01:28:59 -0400 [thread overview]
Message-ID: <CACV+narvs1f+YXz1BhssmgtmiF4=Pp_Cg7u_1sdHCdaggKi7VQ@mail.gmail.com> (raw)
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Hi, my name is Jin Huang.
I want to report 2 data races in userspace-rcu-master
Data Race 1: WW
Variable: crdp, defined at src/urcu-call-rcu-impl.h:424
Thread1: userspace-rcu/src/urcu-call-rcu-impl.h
Line 211, inside function set_thread_cpu_affinity:
if (++crdp->gp_count & SET_AFFINITY_CHECK_PERIOD_MASK)
Call order:
(1)pthread_create [src/urcu-call-rcu-impl.h:437]
(2)call_rcu_thread [src/urcu-call-rcu-impl.h:437]
(3)set_thread_cpu_affinity [src/urcu-call-rcu-impl.h:318]
Thread2: userspace-rcu/src/urcu-call-rcu-impl.h
Line 211, inside function set_thread_cpu_affinity:
if (++crdp->gp_count & SET_AFFINITY_CHECK_PERIOD_MASK)
Call order:
(1)pthread_create [src/urcu-call-rcu-impl.h:437]
(2)call_rcu_thread [src/urcu-call-rcu-impl.h:437]
(3)set_thread_cpu_affinity [src/urcu-call-rcu-impl.h:318]
Data Race 2: RW
Variable: crdp, defined at src/urcu-call-rcu-impl.h:424
Thread1: userspace-rcu/src/urcu-call-rcu-impl.h
Line 433, inside function call_rcu_data_init:
crdp->cpu_affinity = cpu_affinity;
Call order:
(1)perftest [src/rcutorture.h:590]
(2)perftestrun [src/rcutorture.h:244]
(3)urcu_signal_free_all_cpu_call_rcu_data [src/rcutorture.h:227]
(4)urcu_signal_get_default_call_rcu_data [src/urcu-call-rcu-impl.h:777]
(5)call_rcu_data_init [src/urcu-call-rcu-impl.h:572]
Thread2: userspace-rcu/src/urcu-call-rcu-impl.h
Line 209, inside function set_thread_cpu_affinity:
if (crdp->cpu_affinity < 0)
Call order:
(1)pthread_create [src/urcu-call-rcu-impl.h:437]
(2)call_rcu_thread [src/urcu-call-rcu-impl.h:437]
(3)set_thread_cpu_affinity [src/urcu-call-rcu-impl.h:318]
Thank You
Best
Jin Huang
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