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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 31710C83F2B for ; Thu, 31 Aug 2023 05:37:55 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=KHPrudNz; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Rbqgj47kDz3cLn for ; Thu, 31 Aug 2023 15:37:53 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=KHPrudNz; dkim-atps=neutral Received: from gandalf.ozlabs.org (mail.ozlabs.org [IPv6:2404:9400:2221:ea00::3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4Rbqfm11Mvz2xjw for ; Thu, 31 Aug 2023 15:37:04 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ellerman.id.au; s=201909; t=1693460224; bh=mcJI19k1bYWrsUV5RrSLseHCYsvRJp714W7vtEfnAuM=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=KHPrudNz58s2FxY40QbiANhLtETTg3IVisYvwKTSN3A26Y7DWbl7e4lQXj9sr3w+S 7r9x5m0OqvSIZJasmu4WwN1APOTQQUDfNXAS/8ut0mhRQk8X3dFyMuWQBUEICNyZhA 2xFpt1sliwhFxJUz5n9BWh9VmOG2qaaAjzqmOWPAz8S+ISKGzSnJsygTu+KqNCdR9K W5COGeoRbzYAhMFM3iDi2s4bsnkzchbtmkAu0AK7m/fkYxTycrJ7A5iJ5QQUy7CJMv UYT9pqgcvX2x2jYCA/h2j5VFzlDteL3enwyq6MzBHrgcke4o2q5kusK1UtTHxW6uGk ikdmejXy4VZgw== Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 4Rbqfl3jrDz4wy0; Thu, 31 Aug 2023 15:37:03 +1000 (AEST) From: Michael Ellerman To: Andreas Schwab , "Liam R. Howlett" Subject: Re: [PATCH v2 1/2] maple_tree: Disable mas_wr_append() when other readers are possible In-Reply-To: <87bkeotin8.fsf@igel.home> References: <20230819004356.1454718-1-Liam.Howlett@oracle.com> <20230819004356.1454718-2-Liam.Howlett@oracle.com> <87bkeotin8.fsf@igel.home> Date: Thu, 31 Aug 2023 15:37:02 +1000 Message-ID: <87y1hr22o1.fsf@mail.lhotse> MIME-Version: 1.0 Content-Type: text/plain X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org, maple-tree@lists.infradead.org, linux-mm@kvack.org, Andrew Morton , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Andreas Schwab writes: > This breaks booting on ppc32: Does enabling CONFIG_DEBUG_ATOMIC_SLEEP fix the crash? It did for me on qemu. cheers > Kernel attemptd to writ user page (1ff0) - exploit attempt? (uid: 0) > BUG: Unable to handle kernel data access on write at 0x00001ff0 > Faulting instruction address: 0xc0009554 > Vector: 300 (Data Access) at [c0b09d10] > pc: c0009554: do_softirq_own_stack+0x18/0x30 > lr: c004f480: __irq_exit_rcu+0x70/0xc0 > sp: c0b09dd0 > msr: 1032 > dar: 1ff0 > dsisr: 42000000 > current = 0xc0a08360 > pid = 0, comm = swapper > Linux version 6.5.0 ... > enter ? for help > [c0b09de0] c00ff480 __irq_exit_rcu+0x70/0xc0 > [c0b09df0] c0005a98 Decrementer_virt+0x108/0x10c > --- Exception: 900 (Decrementer) at c06cfa0c __schedule+0x4fc/0x510 > [c0b09ec0] c06cf75c __schedule+0x1cc/0x510 (unreliable) > [c0b09ef0] c06cfc90 __cond_resched+0x2c/0x54 > [c0b09f00] c06d07f8 mutex_lock_killable+0x18/0x5c > [c0b09f10] c013c404 pcpu_alloc+0x110/0x4dc > [c0b09f70] c000cc34 alloc_descr.isra.18+0x48/0x144 > [c0b09f90] c0988aa0 early_irq_init+0x64/0x8c > [c0b09fa0] c097a5a4 start_kernel+0x5b4/0x7b0 > [c0b09ff0] 00003dc0 > mon> > > -- > Andreas Schwab, schwab@linux-m68k.org > GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 > "And now for something completely different."