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From: "Peng, ZhihongX" <zhihongx.peng@intel.com>
To: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
Cc: "olivier.matz@6wind.com" <olivier.matz@6wind.com>,
	"dev@dpdk.org" <dev@dpdk.org>,
	"stable@dpdk.org" <stable@dpdk.org>
Subject: Re: [dpdk-stable] [PATCH v3 1/2] lib/cmdline: release cl when cmdline exit
Date: Wed, 13 Oct 2021 03:12:16 +0000
Message-ID: <DM8PR11MB5591366F0362EDE095E7CA2AF0B79@DM8PR11MB5591.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20211013053615.1ae63b13@sovereign>

> -----Original Message-----
> From: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
> Sent: Wednesday, October 13, 2021 10:36 AM
> To: Peng, ZhihongX <zhihongx.peng@intel.com>
> Cc: olivier.matz@6wind.com; dev@dpdk.org; stable@dpdk.org
> Subject: Re: [PATCH v3 1/2] lib/cmdline: release cl when cmdline exit
> 
> 2021-10-13 01:53 (UTC+0000), Peng, ZhihongX:
> > > -----Original Message-----
> > > From: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
> > > Sent: Monday, October 11, 2021 4:26 PM
> > > To: Peng, ZhihongX <zhihongx.peng@intel.com>
> > > Cc: olivier.matz@6wind.com; dev@dpdk.org; stable@dpdk.org
> > > Subject: Re: [PATCH v3 1/2] lib/cmdline: release cl when cmdline
> > > exit
> > >
> > > 2021-10-08 06:41 (UTC+0000), zhihongx.peng@intel.com:
> > > > From: Zhihong Peng <zhihongx.peng@intel.com>
> > > >
> > > > Malloc cl in the cmdline_stdin_new function, so release in the
> > > > cmdline_stdin_exit function is logical, so that cl will not be
> > > > released alone.
> > > >
> > > > Fixes: af75078fece3 (first public release)
> > > > Cc: stable@dpdk.org
> > >
> > > As I have explained before, backporting this will introduce a
> > > double-free bug in user apps unless their code are fixed, so it must not
> be done.
> >
> > The release notes have stated that this is the only thing we can do,
> > and this unreasonable design should be resolved as soon as possible.
> > And the user apps change is very small.
> 
> Stable release means stable ABI, which means that a compiled binary can use
> the next minor version of DPDK without recompilation. No code change is
> possible in this scenario. If the behavior changes such that cmdline_exit() +
> cmdline_free() worked before and now cmdline_free() cause double-free,
> this is an ABI breakage. Simply put, DPDK .so are replaced, the app restarts
> and crashes. Users can do nothing about that.
> 
> Release notes are for developers updating their application code for the next
> DPDK version.

I may not understand what you mean. I want to know whether this code
can be merged, and if it can be merged, what work do I need to do.

  reply	other threads:[~2021-10-13  3:12 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-31  2:28 [dpdk-stable] [PATCH] " zhihongx.peng
2021-08-31 16:59 ` [dpdk-stable] [dpdk-dev] " Stephen Hemminger
2021-09-06  5:45   ` Peng, ZhihongX
2021-08-31 17:52 ` Dmitry Kozlyuk
2021-09-06  5:51   ` Peng, ZhihongX
2021-09-06  7:33     ` Dmitry Kozlyuk
2021-09-30  6:53       ` Peng, ZhihongX
2021-09-30  7:44         ` Dmitry Kozlyuk
2021-10-08  6:55           ` Peng, ZhihongX
2021-09-17  2:15 ` [dpdk-stable] [PATCH v2 1/2] " zhihongx.peng
2021-09-17  2:15   ` [dpdk-stable] [PATCH v2 2/2] app/test: Delete cmdline free function zhihongx.peng
2021-10-08  6:41     ` [dpdk-stable] [PATCH v3 1/2] lib/cmdline: release cl when cmdline exit zhihongx.peng
2021-10-08  6:41       ` [dpdk-stable] [PATCH v3 2/2] app/test: delete cmdline free function zhihongx.peng
2021-10-11  8:26         ` Dmitry Kozlyuk
2021-10-11  5:20       ` [dpdk-stable] [PATCH v3 1/2] lib/cmdline: release cl when cmdline exit Peng, ZhihongX
2021-10-11  8:25       ` Dmitry Kozlyuk
2021-10-13  1:53         ` Peng, ZhihongX
2021-10-13  2:36           ` Dmitry Kozlyuk
2021-10-13  3:12             ` Peng, ZhihongX [this message]
2021-10-13  1:52       ` [dpdk-stable] [PATCH v4 " zhihongx.peng
2021-10-13  1:52         ` [dpdk-stable] [PATCH v4 2/2] app/test: delete cmdline free function zhihongx.peng
2021-10-15 12:58         ` [dpdk-stable] [PATCH v4 1/2] lib/cmdline: release cl when cmdline exit Olivier Matz
2021-10-18  5:16           ` Peng, ZhihongX
2021-09-30  6:47   ` [dpdk-stable] [PATCH v2 " Peng, ZhihongX

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