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Tue, 20 May 2025 09:47:07 +0000 (GMT) Date: Tue, 20 May 2025 11:47:05 +0200 From: Heiko Carstens To: Ihor Solodrai , Ilya Leoshkevich Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: Re: [bug?] s390: kernel panic on specification exception: 0006 Message-ID: <20250520094705.7932Bc3-hca@linux.ibm.com> References: <4f3768be36e0298be4ceebd4fdd3e96dd4fbdc04@linux.dev> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4f3768be36e0298be4ceebd4fdd3e96dd4fbdc04@linux.dev> X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=EM8G00ZC c=1 sm=1 tr=0 ts=682c4f9d cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=kj9zAlcOel0A:10 a=dt9VzEwgFbYA:10 a=NEAV23lmAAAA:8 a=VuaLrmb_DCXaSyQ9aWYA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-GUID: ndqHY9jSY1soiqAi2mGLACUJw-m9cHwz X-Proofpoint-ORIG-GUID: ndqHY9jSY1soiqAi2mGLACUJw-m9cHwz X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNTIwMDA3OSBTYWx0ZWRfXxOPtJFTQoQvW e5KbT4Np1rwke1MB6rgJTtatfakliBYkpfvaJi2385BgGpRd6h8Xim+p+djCjHOHwRlMNL8kIeY yESFxPnWzLoCVaxjmkk1f/T/SmhhmtU174L38r9o+9Ot6pwHSkyaneoAzZRJ/t0YWRY7Kczhqs2 UsIEkAQ2MYlREfkE9Q6Xl+Fp1r9dBSUdm2yDD2TMeL1rT96PI4sLnQqFvLrLKdnAVEfjweahAaA Cp2A3s0V/JFZB9fHUeKsq2W528I/dG3Nw7QGW6Qnbm6E/RIa2sf7s5jGCjlhb64cVMK794JwbYQ 6olsJ9YAaJqyEIfifwlJWihEayxKkvyVByLiHLhQ8yUGF19z9HVZPiVZVisRVpcu3iX6qgTjFqZ wjDF36U5TQia8mrAElLSNAUXrVjRdvfN4IqJHImsDwwRC7r8nBo8CdxCbWlEZKjXw4W0lYBt X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-05-20_04,2025-05-16_03,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 mlxscore=0 lowpriorityscore=0 mlxlogscore=999 spamscore=0 priorityscore=1501 suspectscore=0 adultscore=0 phishscore=0 clxscore=1011 malwarescore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505070000 definitions=main-2505200079 [full quote, and adding Ilya] On Thu, May 15, 2025 at 07:04:20PM +0000, Ihor Solodrai wrote: > Hi everyone. > > Stumbled on the following while testing unrelated changes to BPF CI scripts: > > #353 select_reuseport:OK > specification exception: 0006 ilc:2 [#1]SMP > Modules linked in: bpf_testmod(OE) [last unloaded: bpf_test_modorder_x(OE)] > CPU: 0 UID: 0 PID: 108 Comm: new_name Tainted: G OE 6.15.0-rc4-g169491540638-dirty #1 NONE > Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE > Hardware name: IBM 8561 LT1 400 (KVM/Linux) > Krnl PSW : 0404e00180000000 000001e43ac595e4 (hrtimer_interrupt+0x4/0x2a0) > R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3 > Krnl GPRS: 7fffffffffffffff 000001e43ac595e0 00000000fff8f200 000001e43c52a0c0 > 00000164c50740d8 0000000000000000 0000000000000000 0000000000000000 > 0000000000000000 0000000000000000 000001643afabe00 0000000000000000 > 000003ff9fbadf98 000001e43b747550 000001e43ab12774 00000000fffdfe68 > Krnl Code:#000001e43ac595e0: 67756573 mxd %f7,1395(%r5,%r6) > >000001e43ac595e4: 743d696e unknown > 000001e43ac595e8: 73303031 unknown > 000001e43ac595ec: 61652c64 unknown > 000001e43ac595f0: 65627567 unknown > 000001e43ac595f4: 2d74 ddr %f7,%f4 > 000001e43ac595f6: 68726561 ld %f7,1377(%r2,%r6) > 000001e43ac595fa: 64733d6f unknown > Call Trace: > [<000001e43ac595e4>] hrtimer_interrupt+0x4/0x2a0 > [<000001e43ab128ca>] do_irq_async+0x5a/0x78 > [<000001e43b65f694>] do_ext_irq+0xac/0x168 > [<000001e43b66ae90>] ext_int_handler+0xc8/0xf8 > Last Breaking-Event-Address: > [<000001e43ab08a9e>] clock_comparator_work+0x2e/0x30 > Kernel panic - not syncing: Fatal exception in interrupt > > This is on the current tip of bpf-next (9325d53fe9ad). > > Job: https://github.com/kernel-patches/vmtest/actions/runs/15051985809/job/42309244372 > You can download full logs from there. > > It only happened once so far, didn't repeat on restart. Looks like the text section, which contains the hrtimer_interrupt function, got corrupted, and an ASCII string was written there. The hexdump above with the corrupted code translates to the following ASCII text: "guest=ins001ae,debug-threads=o". Does that ring a bell?