Module Name: src Committed By: christos Date: Sun Nov 1 20:58:38 UTC 2020
Modified Files: src/sys/rump/include/rump-sys: kern.h src/sys/rump/librump/rumpkern: intr.c scheduler.c sleepq.c Added Files: src/sys/rump/include/sys: sleeptab.h Log Message: PR/55664: Ruslan Nikolaev: Fix: 1. A race condition (bug) in sys/rump/librump/rumpkern/intr.c since rumpuser_cv_signal() is called without holding a mutex 2. sleepq is implemented using a single (global) conditional variable; that should be done per each sleepq separately To generate a diff of this commit: cvs rdiff -u -r1.4 -r1.5 src/sys/rump/include/rump-sys/kern.h cvs rdiff -u -r0 -r1.1 src/sys/rump/include/sys/sleeptab.h cvs rdiff -u -r1.55 -r1.56 src/sys/rump/librump/rumpkern/intr.c cvs rdiff -u -r1.51 -r1.52 src/sys/rump/librump/rumpkern/scheduler.c cvs rdiff -u -r1.20 -r1.21 src/sys/rump/librump/rumpkern/sleepq.c Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.
Modified files: Index: src/sys/rump/include/rump-sys/kern.h diff -u src/sys/rump/include/rump-sys/kern.h:1.4 src/sys/rump/include/rump-sys/kern.h:1.5 --- src/sys/rump/include/rump-sys/kern.h:1.4 Fri Aug 10 17:44:59 2018 +++ src/sys/rump/include/rump-sys/kern.h Sun Nov 1 15:58:38 2020 @@ -1,4 +1,4 @@ -/* $NetBSD: kern.h,v 1.4 2018/08/10 21:44:59 pgoyette Exp $ */ +/* $NetBSD: kern.h,v 1.5 2020/11/01 20:58:38 christos Exp $ */ /* * Copyright (c) 2007-2011 Antti Kantee. All Rights Reserved. @@ -174,6 +174,7 @@ void rump_syscall_boot_establish(const s void rump_schedlock_cv_wait(struct rumpuser_cv *); int rump_schedlock_cv_timedwait(struct rumpuser_cv *, const struct timespec *); +void rump_schedlock_cv_signal(struct cpu_info *, struct rumpuser_cv *); void rump_user_schedule(int, void *); void rump_user_unschedule(int, int *, void *); Index: src/sys/rump/librump/rumpkern/intr.c diff -u src/sys/rump/librump/rumpkern/intr.c:1.55 src/sys/rump/librump/rumpkern/intr.c:1.56 --- src/sys/rump/librump/rumpkern/intr.c:1.55 Mon Dec 16 17:47:55 2019 +++ src/sys/rump/librump/rumpkern/intr.c Sun Nov 1 15:58:38 2020 @@ -1,4 +1,4 @@ -/* $NetBSD: intr.c,v 1.55 2019/12/16 22:47:55 ad Exp $ */ +/* $NetBSD: intr.c,v 1.56 2020/11/01 20:58:38 christos Exp $ */ /* * Copyright (c) 2008-2010, 2015 Antti Kantee. All Rights Reserved. @@ -26,7 +26,7 @@ */ #include <sys/cdefs.h> -__KERNEL_RCSID(0, "$NetBSD: intr.c,v 1.55 2019/12/16 22:47:55 ad Exp $"); +__KERNEL_RCSID(0, "$NetBSD: intr.c,v 1.56 2020/11/01 20:58:38 christos Exp $"); #include <sys/param.h> #include <sys/atomic.h> @@ -464,7 +464,7 @@ rump_softint_run(struct cpu_info *ci) for (i = 0; i < SOFTINT_COUNT; i++) { if (!TAILQ_EMPTY(&si_lvl[i].si_pending)) - rumpuser_cv_signal(si_lvl[i].si_cv); + rump_schedlock_cv_signal(ci, si_lvl[i].si_cv); } } Index: src/sys/rump/librump/rumpkern/scheduler.c diff -u src/sys/rump/librump/rumpkern/scheduler.c:1.51 src/sys/rump/librump/rumpkern/scheduler.c:1.52 --- src/sys/rump/librump/rumpkern/scheduler.c:1.51 Sat Mar 14 14:08:39 2020 +++ src/sys/rump/librump/rumpkern/scheduler.c Sun Nov 1 15:58:38 2020 @@ -1,4 +1,4 @@ -/* $NetBSD: scheduler.c,v 1.51 2020/03/14 18:08:39 ad Exp $ */ +/* $NetBSD: scheduler.c,v 1.52 2020/11/01 20:58:38 christos Exp $ */ /* * Copyright (c) 2010, 2011 Antti Kantee. All Rights Reserved. @@ -26,7 +26,7 @@ */ #include <sys/cdefs.h> -__KERNEL_RCSID(0, "$NetBSD: scheduler.c,v 1.51 2020/03/14 18:08:39 ad Exp $"); +__KERNEL_RCSID(0, "$NetBSD: scheduler.c,v 1.52 2020/11/01 20:58:38 christos Exp $"); #include <sys/param.h> #include <sys/atomic.h> @@ -179,6 +179,16 @@ rump_scheduler_init(int numcpu) mutex_init(&unruntime_lock, MUTEX_DEFAULT, IPL_SCHED); } +void +rump_schedlock_cv_signal(struct cpu_info *ci, struct rumpuser_cv *cv) +{ + struct rumpcpu *rcpu = cpuinfo_to_rumpcpu(ci); + + rumpuser_mutex_enter_nowrap(rcpu->rcpu_mtx); + rumpuser_cv_signal(cv); + rumpuser_mutex_exit(rcpu->rcpu_mtx); +} + /* * condvar ops using scheduler lock as the rumpuser interlock. */ Index: src/sys/rump/librump/rumpkern/sleepq.c diff -u src/sys/rump/librump/rumpkern/sleepq.c:1.20 src/sys/rump/librump/rumpkern/sleepq.c:1.21 --- src/sys/rump/librump/rumpkern/sleepq.c:1.20 Sat Apr 25 11:42:15 2020 +++ src/sys/rump/librump/rumpkern/sleepq.c Sun Nov 1 15:58:38 2020 @@ -1,4 +1,4 @@ -/* $NetBSD: sleepq.c,v 1.20 2020/04/25 15:42:15 bouyer Exp $ */ +/* $NetBSD: sleepq.c,v 1.21 2020/11/01 20:58:38 christos Exp $ */ /* * Copyright (c) 2008 Antti Kantee. All Rights Reserved. @@ -26,7 +26,7 @@ */ #include <sys/cdefs.h> -__KERNEL_RCSID(0, "$NetBSD: sleepq.c,v 1.20 2020/04/25 15:42:15 bouyer Exp $"); +__KERNEL_RCSID(0, "$NetBSD: sleepq.c,v 1.21 2020/11/01 20:58:38 christos Exp $"); #include <sys/param.h> #include <sys/condvar.h> @@ -40,25 +40,20 @@ __KERNEL_RCSID(0, "$NetBSD: sleepq.c,v 1 #include <rump-sys/kern.h> syncobj_t sleep_syncobj; -static kcondvar_t sq_cv; -static int -sqinit1(void) +void +sleepq_init(sleepq_t *sq) { - cv_init(&sq_cv, "sleepq"); - - return 0; + LIST_INIT(sq); + cv_init(&sq->sq_cv, "sleepq"); } void -sleepq_init(sleepq_t *sq) +sleepq_destroy(sleepq_t *sq) { - static ONCE_DECL(sqctl); - - RUN_ONCE(&sqctl, sqinit1); - LIST_INIT(sq); + cv_destroy(&sq->sq_cv); } void @@ -83,7 +78,7 @@ sleepq_block(int timo, bool catch) while (l->l_wchan) { l->l_mutex = mp; /* keep sleepq lock until woken up */ - error = cv_timedwait(&sq_cv, mp, timo); + error = cv_timedwait(&l->l_sleepq->sq_cv, mp, timo); if (error == EWOULDBLOCK || error == EINTR) { if (l->l_wchan) { LIST_REMOVE(l, l_sleepchain); @@ -118,7 +113,7 @@ sleepq_wake(sleepq_t *sq, wchan_t wchan, } } if (found) - cv_broadcast(&sq_cv); + cv_broadcast(&sq->sq_cv); mutex_spin_exit(mp); } @@ -130,7 +125,7 @@ sleepq_unsleep(struct lwp *l, bool clean l->l_wchan = NULL; l->l_wmesg = NULL; LIST_REMOVE(l, l_sleepchain); - cv_broadcast(&sq_cv); + cv_broadcast(&l->l_sleepq->sq_cv); if (cleanup) { mutex_spin_exit(l->l_mutex); Added files: Index: src/sys/rump/include/sys/sleeptab.h diff -u /dev/null src/sys/rump/include/sys/sleeptab.h:1.1 --- /dev/null Sun Nov 1 15:58:39 2020 +++ src/sys/rump/include/sys/sleeptab.h Sun Nov 1 15:58:38 2020 @@ -0,0 +1,40 @@ +/* $NetBSD: sleeptab.h,v 1.1 2020/11/01 20:58:38 christos Exp $ */ + +/* + * Copyright (c) 2020 + * The NetBSD Foundation, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef _RUMP_SYS_SLEEPTAB_H_ +#define _RUMP_SYS_SLEEPTAB_H_ + +struct sleepq { + LIST_HEAD(, lwp); /* anonymous struct */ + kcondvar_t sq_cv; +}; + +void sleepq_destroy(sleepq_t *); + +#endif /* _RUMP_SYS_SLEEPTAB_H_ */