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Wed, 12 Aug 2026 05:16:34 +0000 (GMT) Received: from [9.61.253.67] (unknown [9.61.253.67]) by smtpav01.dal12v.mail.ibm.com (Postfix) with ESMTP; Wed, 12 Aug 2026 05:16:34 +0000 (GMT) Message-ID: <2f7e6c34-7258-4b20-a38e-cedebccb835f@linux.ibm.com> Date: Wed, 12 Aug 2026 10:46:33 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [REGRESSION] Power9 pseries boot hang in v7.2-rc6, narrowed to PowerPC GENERIC_ENTRY conversion window To: Mukesh Kumar Chaurasiya Cc: Shrikanth Hegde , LKML , linuxppc-dev , Madhavan Srinivasan , "Christophe Leroy (CS GROUP)" , Peter Zijlstra References: <96dae110-f79b-4e54-8a9b-514369019b5d@linux.ibm.com> <6d1b5f38-f4e4-46ca-88b4-7c18dd6c6280@linux.ibm.com> Content-Language: en-GB From: Venkat Rao Bagalkote In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODEyMDAzNyBTYWx0ZWRfX1GPQBrpsCBma 5MOXAtEuSlGl0MLqWKrTJi1Pnt0+HEj1OA8XqOyQ7Kb9gzLRQ/MzP5yGnfiH6FNnfj50ixvW78O N8ZUwuJ4F4O9XRkoOaieCOOwaZFdH7/LK83/fqWwaKH1MOvlEO2X6QZWlP8PpQpGqMfChpSfhvm e56mzwkMA1wQ1fuiWRb5vXKrJYfw1OUBlhcfEQrsNYIPT1WO7HhECJPR3kYvhAbrXHFzvrXdxpZ oIxIbFjjd/vjv2Bo1fxm5plcRLy5VTV73YcgJeKaGg5CuoLIWv4El2Kd0qwVtGrraRnYhWnz88j XrDDPKwBu31oWYZ7iXokZIHUzhd02QFv8shwFBkt61rViKWPR400voi4sB9kraRLLRWbSicMSae pWTOtwgEdcJ2ah2H88BaLo9dBrca2AAkP4z4Wzr4iaACxHKs9SaK0JPBvfuz6LvJCDAHko+5bFj ynYadvdoyFwcS+lNGzQ== X-Proofpoint-ORIG-GUID: AYx6LIiqA9DDYZ7iy00YUv9OKsw2RJMm X-Proofpoint-Spam-Info: AW1haW4tMjYwODEyMDAzNyBTYWx0ZWRfX9w80p0+AgM+C l3lPjX2VImEUDvmC/WnoIfK+LjVCMBQxsB/qBcw0TWbD13Mbyre5FO1ZEYbdd57m9FxzvzyF8Wf Kt13tw0itRuozudXEdkcUSPVCbDiCKw= X-Authority-Analysis: v=2.4 cv=IfK3n2qa c=1 sm=1 tr=0 ts=6a7c01b8 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=qQ8GBYjWSL8R78bCLWMA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: F9MGsweoeqnMYcmyDqf9kC6E2zzirsPu X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-12_01,2026-08-10_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 priorityscore=1501 impostorscore=0 bulkscore=0 clxscore=1015 lowpriorityscore=0 adultscore=0 malwarescore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608120037 Hello Mukesh, On 11/08/26 6:16 pm, Mukesh Kumar Chaurasiya wrote: > On Tue, Aug 11, 2026 at 11:37:45AM +0530, Mukesh Kumar Chaurasiya wrote: >> On Mon, Aug 10, 2026 at 05:19:27PM +0530, Venkat Rao Bagalkote wrote: >>> Hi Shrikanth, >>> >>> >>> On 04/08/26 8:23 pm, Shrikanth Hegde wrote: >>>> Hi Venkat. >>>> >>>> On 8/4/26 2:04 PM, Venkat Rao Bagalkote wrote: >>>>> Hi, >>>>> >>>>> I'm seeing a boot regression on a Power9 pseries LPAR. The system >>>>> hangs very early during boot after: >>>>> >>>>> Quiescing Open Firmware ... >>>>> Booting Linux via __start() ... >>>>> >>>> That is strange. not sure where to look at without any logs. >>>> Is it a specific config that fails or this specific LPAR that fails? >>>> >> Is this a specific lpar or all power9 pseries are exhibiting same >> behaviour? Its specific to a lpar. >> >> Regards, >> Mukesh >> [...] >> > Hey Venkat, > > Can you try the below fix? > > diff --git a/arch/powerpc/include/asm/entry-common.h b/arch/powerpc/include/asm/entry-common.h > index c5adb5006361..de64389b0815 100644 > --- a/arch/powerpc/include/asm/entry-common.h > +++ b/arch/powerpc/include/asm/entry-common.h > @@ -270,7 +270,7 @@ static inline void arch_interrupt_exit_prepare(struct pt_regs *regs) > } > > /* irqentry_exit expects to be called with interrupts disabled */ > - local_irq_disable(); > + hard_irq_disable(); > } > > static inline void arch_interrupt_async_enter_prepare(struct pt_regs *regs) > I tired this fix, but issue still persists. Regards, Venkat.