From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0855EC79FAF for ; Mon, 5 Jan 2026 18:24:37 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 6C7306B0005; Mon, 5 Jan 2026 13:24:36 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 674376B0092; Mon, 5 Jan 2026 13:24:36 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 555EC6B0093; Mon, 5 Jan 2026 13:24:36 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 459546B0005 for ; Mon, 5 Jan 2026 13:24:36 -0500 (EST) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id F0A7F14022A for ; Mon, 5 Jan 2026 18:24:35 +0000 (UTC) X-FDA: 84298735710.23.157EAA6 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf23.hostedemail.com (Postfix) with ESMTP id D5B7B140011 for ; Mon, 5 Jan 2026 18:24:33 +0000 (UTC) Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=l9wfCNJW; spf=none (imf23.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org; dmarc=pass (policy=none) header.from=infradead.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1767637474; a=rsa-sha256; cv=none; b=pQWLT/GiJ0fPpY0p3BY5Exlp6JxVJx1F8iFkfA0w5iQebNItJRBR2BZ6/gfxvmniESKchD aQhb9BY/21jIzv4fBduV/vkQCGSUNZeTRcfqNUFg744fnrUwx8OParPaZQTzo38M9NWkLX GkbGW8m+pAU9nvaWUWUr+kwKcyK0wZs= ARC-Authentication-Results: i=1; imf23.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=l9wfCNJW; spf=none (imf23.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org; dmarc=pass (policy=none) header.from=infradead.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1767637474; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=cmAw3sEmOW/PfoEmS4nNuobuL/oTLixAsI0C3Pzjvo0=; b=xIhp3s2p1oK3KKVeoJOjdLky9wO+CabJCB5NxGBMmBYEYP5RjHvlUXFJBvIMbfOh+GcddB 7nq48MsTHjCcighbMSRUeY/vRZ1q9o6hnnl/khXj6uQqTmOIHz/Mk6X1qd8SYvEMDYGv6V fjFkd7DZzlDr00vNZAYkszMtysYZ7KY= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=cmAw3sEmOW/PfoEmS4nNuobuL/oTLixAsI0C3Pzjvo0=; b=l9wfCNJWstlU6DI61gawiguPIS YViswUJweTRCav0QQDt5HVa7Ai0ZCGTfGM3X2ZSD45LS/lkxdlVwmmHC7ITkdmW8GJUTTKDFyjoe/ CzfJ6sDf17ItYV9vNfP5ZVOoKdT/mz8fPjGLaNqDKiKKvZ+tzEuTL4cuzjzUL3ZzAFJ3l2DCW4sHm KWe8ib0w5MSHu0fyXs/kVivqL3eV2NjLDVl5WGygaD0IdQISfSXUIGb6Er0niB/Pu9ydTR7XdpoGF SzUVRvgtWzb6QtAI8lI4eS/8MZ05GDq78blntDUQljxq3oBOrM7eYGMgIrh1xAbHKoj5jc+BEgn0i 0DhsuwSA==; Received: from willy by casper.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1vcpFm-0000000AjJK-0xle; Mon, 05 Jan 2026 18:24:30 +0000 Date: Mon, 5 Jan 2026 18:24:30 +0000 From: Matthew Wilcox To: Calvin Owens Cc: linux-mm@kvack.org, Andrew Morton , David Hildenbrand , Lorenzo Stoakes Subject: Re: [BUG next-20260105] khugepaged: kernel BUG at ./include/linux/xarray.h:1441 Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Queue-Id: D5B7B140011 X-Rspamd-Server: rspam04 X-Stat-Signature: msykg4mdh191n9594ub98f6xay76qwif X-HE-Tag: 1767637473-744173 X-HE-Meta: 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 ZzYYqHvP TXEMx4bOucPcqho6GfvfXnPTCCiAHk4i1MduJbIgkSLBr/gveLDCoIlzDSg2ibqrdlejUc5q7+2ukXpHkLdoe0v6dr7pUyT6GyfZbcWcv+3oMZ5u25e3DIeROoqjp2dxOIDvFygJ50gFCpRbBRSV1l6vizALPwppbKwphtgFIqnktqQZiIf3vPKVzItGM0kDtB9oRiqgg3WCILKXhhXKY0GKfXBi30Bl6FerAbmSgLEaa4klRWCdYz4s5Uw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Jan 05, 2026 at 09:24:46AM -0800, Calvin Owens wrote: > Hello all, > > I'm hitting this BUG_ON consistently after boot on next-20260105: > > [ 17.103774][ T40] node ffff888102d43918 offset 0 parent ffff888102d42920 shift 0 count 64 values 0 array ffff888107432e38 list ffff888102d43930 ffff888102d43930 marks 0 0 0 > [ 17.108851][ T40] ------------[ cut here ]------------ > [ 17.110476][ T40] kernel BUG at ./include/linux/xarray.h:1441! > [ 17.112321][ T40] Oops: invalid opcode: 0000 [#1] SMP PTI > [ 17.114177][ T40] CPU: 1 UID: 0 PID: 40 Comm: khugepaged Not tainted 6.19.0-rc4-next-20260105-x86-hardened-yugetlb #1 PREEMPTLAZY a1685c863f468289fb411d1c9b04bc9e336fe015 > [ 17.118934][ T40] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-20240910_120124-localhost 04/01/2014 > [ 17.122375][ T40] RIP: 0010:hpage_collapse_scan_file+0x1b05/0x1b30 Could you run this through ./scripts/decode_stacktrace.sh ? I'd like to see which caller of xas_lock() triggered this.