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From:   Michael Ellerman <mpe@ellerman.id.au>
To:     Sachin Sant <sachinp@linux.vnet.ibm.com>,
        linuxppc-dev@lists.ozlabs.org
Cc:     linux-kernel@vger.kernel.org
Subject: Re: [powerpc] 5.9.0-rc1 boot failure on POWER9 PowerVM LPAR
In-Reply-To: <2CD14C97-9145-4D98-8C7C-783B278663A2@linux.vnet.ibm.com>
References: <2CD14C97-9145-4D98-8C7C-783B278663A2@linux.vnet.ibm.com>
Date:   Tue, 18 Aug 2020 22:41:39 +1000
Message-ID: <87a6ysi0sc.fsf@mpe.ellerman.id.au>
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Sender: linux-kernel-owner@vger.kernel.org
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Sachin Sant <sachinp@linux.vnet.ibm.com> writes:
> 5.9.0-rc1 fails to boot on POWER9 PowerVM LPAR with following message

Looks like:

https://lore.kernel.org/linuxppc-dev/20200814150509.225615-1-vaibhav@linux.ibm.com/

cheers

>             Starting udev Kernel Device Manager...
> [  OK  ] Started udev Kernel Device Manager.
> BUG: Kernel NULL pointer dereference on read at 0x00000188
> Faulting instruction address: 0xc0000000005417e0
> Oops: Kernel access of bad area, sig: 11 [#1]
> LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries
> Modules linked in: papr_scm(+) uio_pdrv_genirq uio sch_fq_codel ip_tables sd_mod t10_pi ibmvscsi scsi_transport_srp ibmveth
> CPU: 14 PID: 7 Comm: kworker/u32:0 Not tainted 5.9.0-rc1-00085-g06a4ec1d9dc6 #1
> Workqueue: events_unbound async_run_entry_fn
> NIP:  c0000000005417e0 LR: c000000000541784 CTR: c000000000871e30
> REGS: c00000067871b710 TRAP: 0300   Not tainted  (5.9.0-rc1-00085-g06a4ec1d9dc6)
> MSR:  8000000000009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 24822484  XER: 00000000
> CFAR: c00000000054178c DAR: 0000000000000188 DSISR: 40000000 IRQMASK: 0 
> GPR00: c000000000541784 c00000067871b9a0 c00000000173cb00 0000000000000000 
> GPR04: c000000000f9eb50 0000000000000002 0000000000000001 c000000678689000 
> GPR08: c000000000d45e20 0000000000000180 0000000000000001 0000000000000220 
> GPR12: c000000000871e30 c00000001ec5ba00 c00000000017ba18 c000000678220e00 
> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
> GPR20: 0000000000000000 0000000000000000 fffffffffffffef7 ffffffffffffee4b 
> GPR24: 0000000000000000 0000000000000000 0000000000000000 0000000000000003 
> GPR28: c0000000037eb018 c00000000166f9e8 c00000066992dd80 c000000000d45f00 
> NIP [c0000000005417e0] internal_create_group+0x180/0x4e0
> LR [c000000000541784] internal_create_group+0x124/0x4e0
> Call Trace:
> [c00000067871b9a0] [c000000000541784] internal_create_group+0x124/0x4e0 (unreliable)
> [c00000067871ba60] [c000000000541d70] internal_create_groups.part.4+0x70/0x120
> [c00000067871bab0] [c0000000008293d0] device_add+0x470/0x970
> [c00000067871bb70] [c00000000086f028] nd_async_device_register+0x28/0xa0
> [c00000067871bbe0] [c000000000180fec] async_run_entry_fn+0x7c/0x220
> [c00000067871bc70] [c000000000170f20] process_one_work+0x260/0x510
> [c00000067871bd10] [c000000000171258] worker_thread+0x88/0x5e0
> [c00000067871bdb0] [c00000000017bbb4] kthread+0x1a4/0x1b0
> [c00000067871be20] [c00000000000d3d0] ret_from_kernel_thread+0x5c/0x6c
> Instruction dump:
> 7f07c378 38a00000 7fc3f378 4bffe47d 60000000 7c7a1b79 40820218 e93d0009 
> 3b7b0001 7f7b07b4 2fa90000 419e0024 <a3490008> 4192ff7c e8890000 38a00000 
> ---[ end trace c238dab2fca3582d ]---
>
> Kernel panic - not syncing: Fatal exception
>
> Have attached config
>
> thanks
> -Sachin