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Thu, 2 Oct 2025 14:43:26 +0000 (GMT) Date: Thu, 2 Oct 2025 16:43:23 +0200 From: Heiko Carstens To: Heiko Carstens Cc: Thomas =?iso-8859-1?Q?Wei=DFschuh?= , Ilya Leoshkevich , Alexander Gordeev , Vasily Gorbik , Linus Torvalds , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [GIT PULL] s390 fixes for 6.17-rc3 Message-ID: <20251002144323.69394Cc7-hca@linux.ibm.com> References: <20250822123608.142112A72-agordeev@linux.ibm.com> <20251002110526.7570C1c-hca@linux.ibm.com> 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=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20251002110526.7570C1c-hca@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwOTI3MDAyNSBTYWx0ZWRfX3PLBDIly4mg2 keZ/JzaOp030ZfDMyD0V5ETCfdvJRiH+cyeuZhzAd5+hNDaSVGSdnGvUHslOne3/IEFDqFgcA73 isv3OS5si5Vu/WgbBuMj7tKSAriSxul13b5ZC5JnrTQVo7IeEl22/vnCRdVg8XydHqQO7Byx71T CuIV2KB8CPPWEevVOlgQ40Evy6mV/Gz3Gw1700x9H2Y6JfuSbXOwg+fpzg5wQc4K6/s3W9TQHe7 wHer5fRfEIfaZe1IhC6fWyiNOutsq+5vTRgez52enJzV/scfBbWoH7/M7/9sbH8KDOJI6x7Mc0v v5sUNNLqfLMDNHbAOWNNALs/x6E9skoBsUexANGmLCLnwQ2ZSh0B2vs/OjhezGmaz3vpxyWLDru rLmUECMyVbCZQ/wr/CktgZDFh8OF+w== X-Proofpoint-ORIG-GUID: Z10YevIFXZbHNXMwDpwNkJWHHJnUj2u5 X-Proofpoint-GUID: Z10YevIFXZbHNXMwDpwNkJWHHJnUj2u5 X-Authority-Analysis: v=2.4 cv=GdUaXAXL c=1 sm=1 tr=0 ts=68de8f93 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=8nJEP1OIZ-IA:10 a=x6icFKpwvdMA:10 a=MIeSm9THH0csdDuaAvAA:9 a=3ZKOabzyN94A:10 a=wPNLvfGTeEIA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-02_05,2025-10-02_03,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 clxscore=1015 phishscore=0 adultscore=0 priorityscore=1501 malwarescore=0 spamscore=0 bulkscore=0 impostorscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2509150000 definitions=main-2509270025 On Thu, Oct 02, 2025 at 01:05:26PM +0200, Heiko Carstens wrote: > On Thu, Oct 02, 2025 at 12:44:41AM +0200, Thomas Weißschuh wrote: > > Hi Alexander, Vasily and Heiko, > > [ 2.118473] Run /init as init process > > [ 2.142148] User process fault: interruption code 0006 ilc:0 > > [ 2.142626] CPU: 0 UID: 0 PID: 1 Comm: init Not tainted 6.17.0-rc2-00002-gfcc43a7e294f #24 NONE > > [ 2.142739] Hardware name: QEMU 8561 QEMU (KVM/Linux) > > [ 2.142822] User PSW : 0705200080000000 00000000804087b2 ^ > > [ 2.142911] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:2 PM:0 RI:0 EA:1 > > [ 2.142979] User GPRS: 0000000000000000 000000000040c060 ffffffffffffffff 0000000000000002 > > [ 2.143022] 0000000000000800 00000000000007ff 0000000000000000 0000000000000000 > > [ 2.143061] 0000000000000000 000003ff00000001 000000000040c000 000000007ff720ac > > [ 2.143106] 000000007ff720a4 0000000000409540 00000000804087b2 000000007ff71ec0 > > [ 2.143406] User Code: Bad PSW. > > [ 2.144705] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004 ... > Hm, this looks like a qemu bug to me. > > Ilya, could you have a look at this please? > > The above report is a specification exception with an instruction length > code of zero, while the PSW points to a 31 bit user space address. As far > as I understand the architecture this is only possible for an early PSW > specification exception (aka invalid PSW); however the PSW looks good to > me. I was wrong, the above bit should be zero otherwise it is indeed an early PSW specification exception. I'll figure out where this comes from, but might take a few days due to public holiday.