From: "Tan, Jianfeng" <jianfeng.tan@intel.com>
To: Olivier Matz <olivier.matz@6wind.com>,
Maxime Coquelin <maxime.coquelin@redhat.com>
Cc: dev@dpdk.org, Anatoly Burakov <anatoly.burakov@intel.com>,
Thomas Monjalon <thomas@monjalon.net>
Subject: Re: [dpdk-dev] pthread_barrier_deadlock in -rc1
Date: Wed, 2 May 2018 17:32:30 +0800 [thread overview]
Message-ID: <7afa9235-cc14-a05f-7f85-87d8a40d447e@intel.com> (raw)
In-Reply-To: <20180502092011.5nxl5nbka6zfi4hb@neon>
Hi Maxime and Olivier,
[...]
>>> Below patch can fix another strange sigsegv issue in my VM. Please check
>>> if it works for you. I doubt it's use-after-free problem which could
>>> lead to different issues in different env. Please have a try.
>>>
>>>
>>> diff --git a/lib/librte_eal/common/eal_common_thread.c
>>> b/lib/librte_eal/common/eal_common_thread.c
>>> index de69452..d91b67d 100644
>>> --- a/lib/librte_eal/common/eal_common_thread.c
>>> +++ b/lib/librte_eal/common/eal_common_thread.c
>>> @@ -205,6 +205,7 @@ rte_ctrl_thread_create(pthread_t *thread, const char
>>> *name,
>>> goto fail;
>>>
>>> pthread_barrier_wait(¶ms->configured);
>>> + pthread_barrier_destroy(¶ms->configured);
>> Thanks Jianfeng, that fixes my issue.
>> For correctness, I wonder whether we should check pthread_barrier_wait
>> return, and only call destroy() if PTHREAD_BARRIER_SERIAL_THREAD?
>> And so also do same the same thing in rte_thread_init().
>>
>> What do you think?
>> Thanks,
>> Maxime
>
> Thanks for the update. I also have a patch that replaces the barrier by
> a lock which could also work, but if Jianfeng's one fixes the issue, I
> think it is better.
>
> About the PTHREAD_BARRIER_SERIAL_THREAD, not sure it will change
> something:
>
> Upon successful completion, the pthread_barrier_wait() function
> shall return PTHREAD_BARRIER_SERIAL_THREAD for a single
> (arbitrary) thread synchronized at the barrier and zero for each
> of the other threads. Otherwise, an error number shall be
> returned to indicate the error.
>
> I understand that it will ensure that only one barrier will return
> PTHREAD_BARRIER_SERIAL_THREAD, but not necessarily the last one. So
> if destroy() is called in the parent thread, it should be the same, no?
>
> By the way, there is also a small memory leak that was introduced by
> the previous patch, maybe you can add the fix too:
>
> - if (ret != 0)
> + if (ret != 0) {
> + free(params);
> return ret;
> + }
How about: the thread who gets PTHREAD_BARRIER_SERIAL_THREAD returned,
is responsible for the destroy and free(params)?
Thanks,
Jianfeng
next prev parent reply other threads:[~2018-05-02 9:32 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-03 13:04 [dpdk-dev] [PATCH v2 0/4] fix control thread affinities Olivier Matz
2018-04-03 13:04 ` [dpdk-dev] [PATCH v2 1/4] eal: use sizeof to avoid a double use of a define Olivier Matz
2018-04-10 16:18 ` Burakov, Anatoly
2018-04-03 13:04 ` [dpdk-dev] [PATCH v2 2/4] eal: new function to create control threads Olivier Matz
2018-04-10 16:18 ` Burakov, Anatoly
2018-04-03 13:04 ` [dpdk-dev] [PATCH v2 3/4] eal: set name when creating a control thread Olivier Matz
2018-04-10 16:34 ` Burakov, Anatoly
2018-04-23 12:49 ` Olivier Matz
2018-04-17 22:32 ` Thomas Monjalon
2018-04-23 12:52 ` Olivier Matz
2018-04-03 13:04 ` [dpdk-dev] [PATCH v2 4/4] eal: set affinity for control threads Olivier Matz
2018-04-10 16:18 ` Burakov, Anatoly
2018-04-03 13:13 ` [dpdk-dev] [PATCH v2 0/4] fix control thread affinities Olivier Matz
2018-04-10 16:20 ` Burakov, Anatoly
2018-04-24 14:46 ` [dpdk-dev] [PATCH v3 0/5] " Olivier Matz
2018-04-24 14:46 ` [dpdk-dev] [PATCH v3 1/5] eal: use sizeof to avoid a double use of a define Olivier Matz
2018-04-24 14:46 ` [dpdk-dev] [PATCH v3 2/5] eal: new function to create control threads Olivier Matz
2018-04-24 14:46 ` [dpdk-dev] [PATCH v3 3/5] eal: set name when creating a control thread Olivier Matz
2018-04-24 16:08 ` Burakov, Anatoly
2018-04-27 15:46 ` Tan, Jianfeng
2018-04-27 16:17 ` Tan, Jianfeng
2018-04-27 16:46 ` Burakov, Anatoly
2018-04-24 14:46 ` [dpdk-dev] [PATCH v3 4/5] eal: set affinity for control threads Olivier Matz
2018-04-24 14:46 ` [dpdk-dev] [PATCH v3 5/5] examples: use new API to create " Olivier Matz
2018-04-24 22:53 ` [dpdk-dev] [PATCH v3 0/5] fix control thread affinities Thomas Monjalon
2018-04-30 15:45 ` [dpdk-dev] pthread_barrier_deadlock in -rc1 (was: "Re: [PATCH v3 0/5] fix control thread affinities") Maxime Coquelin
2018-04-30 18:46 ` Olivier Matz
2018-05-01 8:59 ` Thomas Monjalon
2018-05-02 8:19 ` [dpdk-dev] pthread_barrier_deadlock in -rc1 Tan, Jianfeng
2018-05-02 8:34 ` Maxime Coquelin
2018-05-02 8:50 ` Tan, Jianfeng
2018-05-02 9:05 ` Maxime Coquelin
2018-05-02 9:20 ` Olivier Matz
2018-05-02 9:32 ` Tan, Jianfeng [this message]
2018-05-02 9:41 ` Maxime Coquelin
2018-05-02 9:30 ` Burakov, Anatoly
2018-05-02 9:38 ` Tan, Jianfeng
2018-05-02 9:57 ` Olivier Matz
2018-05-02 10:01 ` Tan, Jianfeng
2018-05-02 10:08 ` Olivier Matz
2018-05-02 10:16 ` Tan, Jianfeng
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