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Wed, 15 Jul 2026 23:29:56 -0700 (PDT) From: Ritesh Harjani (IBM) To: Sourabh Jain , Mahesh J Salgaonkar , linuxppc-dev , Mahesh J Salgaonkar , Venkat Rao Bagalkote , Narayana Murty N , Nicholas Piggin , Michael Ellerman , shivang upadhyay , sbhat@linux.ibm.com Subject: Re: powerpc/pseries: EEH detected with xhci_hcd In-Reply-To: <29f33de0-0861-459f-b6a0-440354fac785@linux.ibm.com> Date: Thu, 16 Jul 2026 10:21:03 +0530 Message-ID: References: <2ad00297-eca5-4f36-ad01-138837f6fa4f@linux.ibm.com> <29f33de0-0861-459f-b6a0-440354fac785@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list Sourabh Jain writes: > This issue only occurs with the Radix MMU. > Booting the same kernel with disable_radix=1 does not reproduce the issue. > > The system also has pmem. @Sourabh, Few requests - 1. Could you also attach the boot logs from the same system with the same kernel but with disable_radix=1? 2. I can't really tell on how is MMU related to this issue? But I think if you could share the working dmesg logs from Hash that might give some more info. I am suspecting what if the firmware negotiates different page sizes even for TCEs for Radix v/s Hash. 3. Would it be possible for you to try git bisect and identify the culprit commit? Btw, to clarify I think there are two issues here: 1. EEH triggered for the USB adapter - I think you meant that with Hash you don't even see EEH error being triggered at all. 2. Second problem is - EEH recovery causing this WARNING. [ 17.375534] [ T118] WARNING: arch/powerpc/kernel/eeh_pe.c:439 at eeh_pe_tree_remove+0xf8/0x2f0, CPU#10: eehd/118 <...> [ 17.375599] [ T118] CPU: 10 UID: 0 PID: 118 Comm: eehd Tainted: G E 7.2.0-rc3upstream+ #3 PREEMPT(lazy) f29942c1738362234fefd88de0d1ed711f1a557e [ 17.375603] [ T118] Tainted: [E]=UNSIGNED_MODULE [ 17.375604] [ T118] Hardware name: IBM,9080-HEX Power11 (architected) 0x820200 0xf000007 of:IBM,FW1120.00 (NH1120_135) hv:phyp pSeries <...> [ 17.375650] [ T118] NIP [c00000000004a048] eeh_pe_tree_remove+0xf8/0x2f0 [ 17.375654] [ T118] LR [c00000000004ba6c] eeh_pe_detach_dev+0x5c/0xa0 [ 17.375658] [ T118] Call Trace: [ 17.375659] [ T118] [c00000000a357c90] [c00000000dd32800] 0xc00000000dd32800 (unreliable) [ 17.375668] [ T118] [c00000000a357d30] [c00000000004ba6c] eeh_pe_detach_dev+0x5c/0xa0 [ 17.375672] [ T118] [c00000000a357d60] [c0000000000496ec] eeh_pe_traverse+0x6c/0xf0 [ 17.375676] [ T118] [c00000000a357da0] [c00000000004e100] eeh_reset_device+0x1f8/0x298 [ 17.375680] [ T118] [c00000000a357e50] [c00000000004ce5c] eeh_handle_normal_event+0x61c/0xa60 [ 17.375685] [ T118] [c00000000a357f30] [c00000000004e298] eeh_event_handler+0xf8/0x190 [ 17.375689] [ T118] [c00000000a357f90] [c00000000025dab4] kthread+0x194/0x1b0 -ritesh