From: Zhen Lei <thunder.leizhen@huawei.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable <stable@vger.kernel.org>
Cc: Zhen Lei <thunder.leizhen@huawei.com>,
Anna-Maria Gleixner <anna-maria@linutronix.de>,
Mike Galbraith <efault@gmx.de>,
Sasha Levin <sasha.levin@oracle.com>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: [PATCH 4.4 00/11] Fix a potential infinite loop in RT futex-pi scenarios
Date: Mon, 2 Aug 2021 21:46:13 +0800 [thread overview]
Message-ID: <20210802134624.1934-1-thunder.leizhen@huawei.com> (raw)
Commit 73d786bd043e "futex: Rework inconsistent rt_mutex/futex_q state"
mentions that it could cause an infinite loop, and will fix it in the later
patches:
bebe5b514345f09 futex: Futex_unlock_pi() determinism
cfafcd117da0216 futex: Rework futex_lock_pi() to use rt_mutex_*_proxy_lock()
But at the moment they're not backported. In a single-core environment, the
probability of triggering is high.
I also backported commit b4abf91047cf ("rtmutex: Make wait_lock irq safe"),
it fixes a potential deadlock problem. Although it hasn't actually been
triggered in our environment at the moment.
Other patches are used to resolve conflicts or fix problems caused by new
patches.
Anna-Maria Gleixner (1):
rcu: Update documentation of rcu_read_unlock()
Mike Galbraith (1):
futex: Handle transient "ownerless" rtmutex state correctly
Peter Zijlstra (6):
futex: Cleanup refcounting
futex,rt_mutex: Introduce rt_mutex_init_waiter()
futex: Pull rt_mutex_futex_unlock() out from under hb->lock
futex: Rework futex_lock_pi() to use rt_mutex_*_proxy_lock()
futex: Futex_unlock_pi() determinism
futex,rt_mutex: Fix rt_mutex_cleanup_proxy_lock()
Thomas Gleixner (3):
futex: Rename free_pi_state() to put_pi_state()
rtmutex: Make wait_lock irq safe
futex: Avoid freeing an active timer
include/linux/rcupdate.h | 4 +-
kernel/futex.c | 245 +++++++++++++++++++++-----------
kernel/locking/rtmutex.c | 185 +++++++++++++-----------
kernel/locking/rtmutex_common.h | 2 +-
4 files changed, 262 insertions(+), 174 deletions(-)
--
2.26.0.106.g9fadedd
next reply other threads:[~2021-08-02 13:50 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-02 13:46 Zhen Lei [this message]
2021-08-02 13:46 ` [PATCH 4.4 01/11] futex: Rename free_pi_state() to put_pi_state() Zhen Lei
2021-08-02 13:46 ` [PATCH 4.4 02/11] futex: Cleanup refcounting Zhen Lei
2021-08-02 13:46 ` [PATCH 4.4 03/11] futex,rt_mutex: Introduce rt_mutex_init_waiter() Zhen Lei
2021-08-02 13:46 ` [PATCH 4.4 04/11] futex: Pull rt_mutex_futex_unlock() out from under hb->lock Zhen Lei
2021-08-02 13:46 ` [PATCH 4.4 05/11] futex: Rework futex_lock_pi() to use rt_mutex_*_proxy_lock() Zhen Lei
2021-08-02 13:46 ` [PATCH 4.4 06/11] futex: Futex_unlock_pi() determinism Zhen Lei
2021-08-02 13:46 ` [PATCH 4.4 07/11] rtmutex: Make wait_lock irq safe Zhen Lei
2021-08-02 13:46 ` [PATCH 4.4 08/11] futex: Handle transient "ownerless" rtmutex state correctly Zhen Lei
2021-08-02 13:46 ` [PATCH 4.4 09/11] futex: Avoid freeing an active timer Zhen Lei
2021-08-02 13:46 ` [PATCH 4.4 10/11] futex,rt_mutex: Fix rt_mutex_cleanup_proxy_lock() Zhen Lei
2021-08-02 13:46 ` [PATCH 4.4 11/11] rcu: Update documentation of rcu_read_unlock() Zhen Lei
2021-08-03 0:53 ` [PATCH 4.4 00/11] Fix a potential infinite loop in RT futex-pi scenarios Joe Korty
2021-08-08 6:46 ` Greg Kroah-Hartman
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