linux-kernel - Re: [linux-next:master] [x86/module] 6661cae1aa: WARNING:at_arch/x86/mm/pat/set_memory.c:#__cpa_process

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <f2af0c30-c7d7-472d-9aa3-ffa311b2e777@intel.com>
Date: Fri, 11 Oct 2024 09:30:33 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Mike Rapoport <rppt@...nel.org>
Cc: kernel test robot <oliver.sang@...el.com>, oe-lkp@...ts.linux.dev,
 lkp@...el.com, Linux Memory Management List <linux-mm@...ck.org>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Andreas Larsson <andreas@...sler.com>, Andy Lutomirski <luto@...nel.org>,
 Ard Biesheuvel <ardb@...nel.org>, Arnd Bergmann <arnd@...db.de>,
 Borislav Petkov <bp@...en8.de>, Brian Cain <bcain@...cinc.com>,
 Catalin Marinas <catalin.marinas@....com>,
 Christophe Leroy <christophe.leroy@...roup.eu>,
 Christoph Hellwig <hch@...radead.org>,
 Dave Hansen <dave.hansen@...ux.intel.com>, Dinh Nguyen
 <dinguyen@...nel.org>, Geert Uytterhoeven <geert@...ux-m68k.org>,
 Guo Ren <guoren@...nel.org>, Helge Deller <deller@....de>,
 Huacai Chen <chenhuacai@...nel.org>, Ingo Molnar <mingo@...hat.com>,
 Johannes Berg <johannes@...solutions.net>,
 John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
 Kent Overstreet <kent.overstreet@...ux.dev>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 Luis Chamberlain <mcgrof@...nel.org>, Mark Rutland <mark.rutland@....com>,
 Masami Hiramatsu <mhiramat@...nel.org>, Matt Turner <mattst88@...il.com>,
 Max Filippov <jcmvbkbc@...il.com>, Michael Ellerman <mpe@...erman.id.au>,
 Michal Simek <monstr@...str.eu>, Oleg Nesterov <oleg@...hat.com>,
 Palmer Dabbelt <palmer@...belt.com>, Peter Zijlstra <peterz@...radead.org>,
 Richard Weinberger <richard@....at>, Russell King <linux@...linux.org.uk>,
 Song Liu <song@...nel.org>, Stafford Horne <shorne@...il.com>,
 Steven Rostedt <rostedt@...dmis.org>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 Thomas Gleixner <tglx@...utronix.de>, Uladzislau Rezki <urezki@...il.com>,
 Vineet Gupta <vgupta@...nel.org>, Will Deacon <will@...nel.org>,
 linux-kernel@...r.kernel.org
Subject: Re: [linux-next:master] [x86/module] 6661cae1aa:
 WARNING:at_arch/x86/mm/pat/set_memory.c:#__cpa_process_fault

On 10/11/24 08:40, Mike Rapoport wrote:
> On Fri, Oct 11, 2024 at 07:00:01AM -0700, Dave Hansen wrote:
>> On 10/11/24 06:08, Mike Rapoport wrote:
>>> This patch disables ROX caches on 32-bit, it should fix the issue.
>> While I'm not going to shed a tear for 32-bit, what's the actual
>> compatibility issue with 32-bit?
> From the stack trace it looks like execmem tries to update the direct map
> for highmem memory, and cpa is not happy about it.

First of all, if it's a highmem problem, shouldn't the check be for
CONFIG_HIGHMEM and not on 32-bit vs. 64-bit?  We do have non-highmem
32-bit configs.

Also, where did the highmem come from?  All of the execmem allocations
look like they're some variant of PAGE_KERNEL, but no __GFP_HIGHMEM.