From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from gwu.lbox.cz (gwu.lbox.cz [62.245.111.132]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F009D3D891F for ; Sun, 4 Oct 2026 18:41:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=62.245.111.132 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791139293; cv=none; b=iJdmYGapx57qXHn7u1DW9jvtfRa+rDkJTCocpsgYBdKMJvscNw/u8LnLFQ7sBBF6QJbLQNp69fzNryUGIhDUaVT7oMf9tzVgHVA1pZyAyvYDayHnY4CJMSQVTJtMfvzxNCUhqnI2ZO3tfVhpvc8dib4Woda/nWZm2Y9G9Efziug= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791139293; c=relaxed/simple; bh=Ilj/qLUBZLlDKeYARVUHdxQ61njJdS9D0AL72+ZsaOo=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=UqFzWddWHd/9Tr64RlFNnZjRClwiSmFZ7g/xRGeiqcoeuKOJ693Mlzy9RVjmLkY20rvZvXYg3u0s27X8XYnUaulJsRPyQtK4Bm2Y2t8lkXxhvkTKMgBLVV89YQI0zCeHbyCx3X63Jf1EyqTVBeN5OJ3JOZDJrWMPGBdbqSp6gq8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linuxbox.cz; spf=pass smtp.mailfrom=linuxbox.cz; dkim=pass (1024-bit key) header.d=linuxbox.cz header.i=@linuxbox.cz header.b=v2jb7J2w; arc=none smtp.client-ip=62.245.111.132 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linuxbox.cz Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linuxbox.cz Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxbox.cz header.i=@linuxbox.cz header.b="v2jb7J2w" Received: from linuxbox.linuxbox.cz (linuxbox.linuxbox.cz [10.76.66.10]) by gwu.lbox.cz (Sendmail) with ESMTPS id 694IeCv24062070 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Sun, 4 Oct 2026 20:40:12 +0200 DKIM-Filter: OpenDKIM Filter v2.11.0 gwu.lbox.cz 694IeCv24062070 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxbox.cz; s=default; t=1791139213; bh=rllT4vqJD2NoBqkOWbpm3bVQeR7t2xedICOUbN/pD1E=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=v2jb7J2wuPw9seFuOTpB6Wh5FuKsdT2PhHJpMPjDu6kQ4yhxA+camUvyRz7/gBEdD 98oaxIGogrYsQrk5nXHBUajjmy9z8A1O8BUWjavxijuD2HPI0CYqNPyc4nv2V7nZkO vu9qL5hWC0Qzn7/YLwVBY2b0BNk4IBx/amzbHTgE= Received: from pcnci.linuxbox.cz (pcnci.linuxbox.cz [10.76.3.14]) by linuxbox.linuxbox.cz (Sendmail) with ESMTPS id 694IeAgE022557 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Sun, 4 Oct 2026 20:40:11 +0200 Received: from pcnci.linuxbox.cz (localhost [127.0.0.1]) by pcnci.linuxbox.cz (8.18.1/8.15.2) with ESMTPS id 694Ie5XQ2331672 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Sun, 4 Oct 2026 20:40:07 +0200 Date: Sun, 4 Oct 2026 20:40:05 +0200 From: Nikola Ciprich To: "Lorenzo Stoakes (ARM)" Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, david@kernel.org, Mike Rapoport , Dave Hansen , Pedro Falcato , Kiryl Shutsemau , luizcap@redhat.com, pbonzini@redhat.com, Borislav Petkov , Tal Zussman , Rik van Riel , Matt Fleming , Nikola Ciprich Subject: Re: hunting memory corruption bug in 6.18.x Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Scanned-By: MIMEDefang 3.7.1 on 10.76.66.3 X-Scanned-By: MIMEDefang v3.7.1/SpamAssassin v4.000002 on lbxovapx9 (nik) X-Scanned-By: MIMEDefang 2.86 on 10.76.66.10 X-Antivirus: on lbxovapx9 by Antivirus X-Spam-Score: N/A (trusted relay) X-Milter-Copy-Status: O > > > > well, not so good news here.. I tried the reproducer on multiple > > lab machines and also on one drained production box on which we've > > experienced one crash and wasn't able to get a single hit so far. > > Here's the list of machines: > > > > hostname CPU RAM kernel microcode > > pocstdv1b EPYC 9124 384G 6.18.31lb9.01 0x0a101158 > > labtest EPYC 9274F 64G 6.18.20lb9.01 0x0a101158 > > lbxovav6d EPYC 9124 1.5TB 6.18.31lb9.01 0x0a101158 > > prfjazv1g EPYC 7343 1TB 6.18.53lb9.02 0x0a0011de > > nrbphav4a EPYC 7343 1TB 6.18.15lb9.01 0x0a0011de > > > > I'll leave it running for few hours, and report back. If I'm able to reproduce, > > I'll try recommended workarounds and report as well. > > Thanks for trying that! > > Yeah, it might have been tuned to the zen arch rather than milan so that could > be making it less effective unfortunately. I executed 100x300 rounds on each machine.. unfortunately not a single hit.. > > Thanks! The LLM has informed me that it got that wrong but it was interesting > data (...!) which suggests guest memory page tables might have somehow ended up > there. > > Could you try: > > crash> p d_hash_shift > crash> eval (0x5560450b >> D) * 8 + 0xffffb18900a00000 > D = the d_hash_shift value > crash> eval (B & 0xfffffffffffff000) > B = the hex result above > crash> vtop B > crash> rd -64 P 512 > P = the hex result of the second eval > crash> search -p -m 0xfff0000000000fff PHYS > PHYS = the PHYSICAL column from vtop > > And for the pages the physical search found: > > crash> kmem 0x1ae234000 > crash> kmem 0x24f0e2000 > crash> kmem 0x103360000 > crash> rd -p 0x1ae234000 512 I struggled with crash a bit to get computations right, so I did it in python.. hopefully I got it right... crash> rd -64 0xffffb18905f60000 512 ffffb18905f60000: 0000000000000000 0000000000000000 ................ ffffb18905f60010: 0000000000000000 0000000000000000 ................ ffffb18905f60020: 0000000000000000 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ffffb18905f60f90: 0000000000000000 0000000000000000 ................ ffffb18905f60fa0: 0000000000000000 0000000000000000 ................ ffffb18905f60fb0: 0000000000000000 0000000000000000 ................ ffffb18905f60fc0: 0000000000000000 0000000000000000 ................ ffffb18905f60fd0: 0000000000000000 0000000000000000 ................ ffffb18905f60fe0: 0000000000000000 0000000000000000 ................ ffffb18905f60ff0: 0000000000000000 0000000000000000 ................ crash> search -p -m 0xfff0000000000fff 0x103360450 1225c6d18: 103360002 3852821a8: 103360798 48d9bbddf0: 200000103360a51 100184f6d18: 103360002 10018576d18: 103360002 100193e6d18: 103360002 crash> kmem 0x1225c6d18 PAGE PHYSICAL MAPPING INDEX CNT FLAGS fffff27144897180 1225c6000 0 0 0 2ffff800000000 crash> kmem 0x3852821a8 PAGE PHYSICAL MAPPING INDEX CNT FLAGS fffff2714e14a080 385282000 0 ebbf2000 1 2ffff800000000 crash> kmem 0x48d9bbddf0 PAGE PHYSICAL MAPPING INDEX CNT FLAGS fffff2726366ef40 48d9bbd000 0 eac4a000 1 2ffff800000000 crash> kmem 0x100184f6d18 PAGE PHYSICAL MAPPING INDEX CNT FLAGS fffff27540613d80 100184f6000 0 0 0 6ffff800000000 crash> kmem 0x10018576d18 PAGE PHYSICAL MAPPING INDEX CNT FLAGS fffff27540615d80 10018576000 0 0 0 6ffff800000000 crash> kmem 0x100193e6d18 PAGE PHYSICAL MAPPING INDEX CNT FLAGS fffff2754064f980 100193e6000 0 0 0 6ffff800000000 crash> rd -p 0x103360000 512 103360000: 0000000000000000 0000000000000000 ................ 103360010: 0000000000000000 0000000000000000 ................ 103360020: 0000000000000000 0000000000000000 ................ 103360030: 0000000000000000 0000000000000000 ................ 103360040: 0000000000000000 0000000000000000 ................ 103360050: 0000000000000000 0000000000000000 ................ 103360060: 0000000000000000 0000000000000000 ................ 103360070: 0000000000000000 0000000000000000 ................ 103360080: 0000000000000000 0000000000000000 ................ 103360090: 0000000000000000 0000000000000000 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I'll plan rebooting those problematic production boxes to set tlbi=ipi and also switch to kernel with the patch you've sent me cheers! nik > > Thanks! > > -- > Cheers, Lorenzo > -- Ing. Nikola CIPRICH technický ředitel +420 591 166 214 +420 777 093 799 nikola.ciprich@linuxbox.cz www.linuxbox.cz