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Date: Wed, 29 Mar 2017 15:42:06 +0900 From: Sergey Senozhatsky <sergey.senozhatsky@...il.com> To: Minchan Kim <minchan@...nel.org>, Yisheng Xie <xieyisheng1@...wei.com> Cc: ngupta@...are.org, sergey.senozhatsky.work@...il.com, linux-mm@...ck.org, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Xishi Qiu <qiuxishi@...wei.com>, Hanjun Guo <guohanjun@...wei.com> Subject: Re: [RFC]mm/zsmalloc,: trigger BUG_ON in function zs_map_object. On (03/29/17 09:20), Minchan Kim wrote: > Hello, > > On Tue, Mar 28, 2017 at 03:20:22PM +0800, Yisheng Xie wrote: > > Hi, all, > > > > We had backport the no-lru migration to linux-4.1, meanwhile change the > > ZS_MAX_ZSPAGE_ORDER to 3. Then we met a BUG_ON(!page[1]). > > Hmm, I don't know how you backported. > > There isn't any problem with default ZS_MAX_ZSPAGE_ORDER. Right? > So, it happens only if you changed it to 3? I agree with Minchan. too much things could have gone wrong during the backport. > Could you tell me what is your base kernel? and what zram/zsmalloc > version(ie, from what kernel version) you backported to your > base kernel? agree again. Yisheng, do you have this commit applied? commit c102f07ca0b04f2cb49cfc161c83f6239d17f491 Author: Junil Lee <junil0814.lee@....com> Date: Wed Jan 20 14:58:18 2016 -0800 zsmalloc: fix migrate_zspage-zs_free race condition -ss
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