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Date: Wed, 29 Mar 2017 09:20:29 +0900 From: Minchan Kim <minchan@...nel.org> To: 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. 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? 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? > > It rarely happen, and presently, what I get is: > [6823.316528s]obj=a160701f, obj_idx=15, class{size:2176,objs_per_zspage:15,pages_per_zspage:8} > [...] > [6823.316619s]BUG: failure at /home/ethan/kernel/linux-4.1/mm/zsmalloc.c:1458/zs_map_object()! ----> BUG_ON(!page[1]) > > It seems that we have allocated an object from a ZS_FULL group? > (Actually, I do not get the inuse number of this zspage, which I am trying to.) > And presently, I can not find why it happened. Any idea about it? Although it happens rarely, always above same symptom once it happens? > > Any comment is more than welcome! > > Thanks > Yisheng Xie > > > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majordomo@...ck.org. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: <a href=mailto:"dont@...ck.org"> email@...ck.org </a>
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