Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: linux-next: boot failure in today's linux-next
To:     Stephen Rothwell <sfr@canb.auug.org.au>
Cc:     Linux Next Mailing List <linux-next@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        PowerPC <linuxppc-dev@lists.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linus <torvalds@linux-foundation.org>,
        Changheun Lee <nanich.lee@samsung.com>
References: <20210426163606.36a97253@canb.auug.org.au>
 <20210426174310.6f03345b@canb.auug.org.au>
From:   Jens Axboe <axboe@kernel.dk>
Message-ID: <387b26fe-81f5-1bb1-33fd-7fccb7b73823@kernel.dk>
Date:   Mon, 26 Apr 2021 06:46:20 -0600
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101
 Thunderbird/68.10.0
MIME-Version: 1.0
In-Reply-To: <20210426174310.6f03345b@canb.auug.org.au>
Content-Type: text/plain; charset=windows-1252
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 4/26/21 1:43 AM, Stephen Rothwell wrote:
> Hi all,
> 
> On Mon, 26 Apr 2021 16:36:06 +1000 Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>>
>> Today's linux-next build (ipowerpc_pseries_le_defconfig)
>> failed its qemu boot tests like this:
>>
>> [    1.833361][    T1] ibmvscsi 71000003: SRP_VERSION: 16.a
>> [    1.834439][    T1] ibmvscsi 71000003: Maximum ID: 64 Maximum LUN: 32 Maximum Channel: 3
>> [    1.834683][    T1] scsi host0: IBM POWER Virtual SCSI Adapter 1.5.9
>> [    1.842605][    C0] ibmvscsi 71000003: partner initialization complete
>> [    1.844979][    C0] ibmvscsi 71000003: host srp version: 16.a, host partition qemu (0), OS 2, max io 2097152
>> [    1.845502][    C0] ibmvscsi 71000003: sent SRP login
>> [    1.845853][    C0] ibmvscsi 71000003: SRP_LOGIN succeeded
>> [    1.851447][    T1] BUG: Kernel NULL pointer dereference on write at 0x00000390
>> [    1.851577][    T1] Faulting instruction address: 0xc00000000070386c
>> [    1.852171][    T1] Oops: Kernel access of bad area, sig: 11 [#1]
>> [    1.852324][    T1] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries
>> [    1.852689][    T1] Modules linked in:
>> [    1.853136][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.12.0 #2
>> [    1.853555][    T1] NIP:  c00000000070386c LR: c000000000703a6c CTR: 0000000000000000
>> [    1.853679][    T1] REGS: c0000000063a2f40 TRAP: 0380   Not tainted  (5.12.0)
>> [    1.853870][    T1] MSR:  8000000002009033 <SF,VEC,EE,ME,IR,DR,RI,LE>  CR: 44002240  XER: 00000000
>> [    1.854305][    T1] CFAR: c000000000703a68 IRQMASK: 0 
>> [    1.854305][    T1] GPR00: c000000000703a6c c0000000063a31e0 c00000000146b200 c0000000080ca800 
>> [    1.854305][    T1] GPR04: c000000006067380 c00c000000020180 0000000000000024 0000000000008500 
>> [    1.854305][    T1] GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
>> [    1.854305][    T1] GPR12: 0000000000002000 c000000001640000 c000000008068508 0000000000000020 
>> [    1.854305][    T1] GPR16: 0000000000000000 0000000000000024 c000000000f85f78 c000000000f0d998 
>> [    1.854305][    T1] GPR20: c0000000013b59e0 0000000000000003 c0000000063a340c 0000000000000001 
>> [    1.854305][    T1] GPR24: 0000000000000000 c0000000084a3000 c0000000080ca800 c00c000000020180 
>> [    1.854305][    T1] GPR28: 0000000000008500 c0000000080ca800 0000000000000024 c000000006067380 
>> [    1.855486][    T1] NIP [c00000000070386c] bio_add_hw_page+0x7c/0x240
>> [    1.856357][    T1] LR [c000000000703a6c] bio_add_pc_page+0x3c/0x70
>> [    1.856723][    T1] Call Trace:
>> [    1.856890][    T1] [c0000000063a31e0] [0000000000000c00] 0xc00 (unreliable)
>> [    1.857390][    T1] [c0000000063a3230] [c00000000070105c] bio_kmalloc+0x3c/0xd0
>> [    1.857514][    T1] [c0000000063a3260] [c000000000713014] blk_rq_map_kern+0x164/0x4a0
>> [    1.857630][    T1] [c0000000063a32d0] [c0000000008e17dc] __scsi_execute+0x1cc/0x270
>> [    1.857746][    T1] [c0000000063a3350] [c0000000008e7bf0] scsi_probe_and_add_lun+0x250/0xd90
>> [    1.857887][    T1] [c0000000063a34c0] [c0000000008e921c] __scsi_scan_target+0x17c/0x630
>> [    1.858007][    T1] [c0000000063a35d0] [c0000000008e9900] scsi_scan_channel+0x90/0xe0
>> [    1.858133][    T1] [c0000000063a3620] [c0000000008e9ba8] scsi_scan_host_selected+0x138/0x1a0
>> [    1.858258][    T1] [c0000000063a3670] [c0000000008e9fec] scsi_scan_host+0x2dc/0x320
>> [    1.858367][    T1] [c0000000063a3710] [c00000000091b2a0] ibmvscsi_probe+0xa70/0xa80
>> [    1.858487][    T1] [c0000000063a3800] [c0000000000eb8ac] vio_bus_probe+0x9c/0x460
>> [    1.858616][    T1] [c0000000063a38a0] [c0000000008979bc] really_probe+0x12c/0x6b0
>> [    1.858749][    T1] [c0000000063a3950] [c000000000897fd4] driver_probe_device+0x94/0x130
>> [    1.858874][    T1] [c0000000063a3980] [c00000000089896c] device_driver_attach+0x11c/0x130
>> [    1.858999][    T1] [c0000000063a39c0] [c000000000898a38] __driver_attach+0xb8/0x1a0
>> [    1.859123][    T1] [c0000000063a3a10] [c0000000008941a8] bus_for_each_dev+0xa8/0x130
>> [    1.859257][    T1] [c0000000063a3a70] [c000000000896ef4] driver_attach+0x34/0x50
>> [    1.859381][    T1] [c0000000063a3a90] [c000000000896510] bus_add_driver+0x170/0x2b0
>> [    1.859503][    T1] [c0000000063a3b20] [c000000000899b04] driver_register+0xb4/0x1c0
>> [    1.859626][    T1] [c0000000063a3b90] [c0000000000ea808] __vio_register_driver+0x68/0x90
>> [    1.859754][    T1] [c0000000063a3bb0] [c0000000010cee74] ibmvscsi_module_init+0xa4/0xdc
>> [    1.859931][    T1] [c0000000063a3bf0] [c000000000012190] do_one_initcall+0x60/0x2c0
>> [    1.860071][    T1] [c0000000063a3cc0] [c0000000010846e4] kernel_init_freeable+0x300/0x3a0
>> [    1.860207][    T1] [c0000000063a3da0] [c000000000012764] kernel_init+0x2c/0x168
>> [    1.860336][    T1] [c0000000063a3e10] [c00000000000d5ec] ret_from_kernel_thread+0x5c/0x70
>> [    1.860690][    T1] Instruction dump:
>> [    1.861072][    T1] fba10038 7cbb2b78 7c7d1b78 7cfc3b78 a1440048 2c2a0000 4082008c a13f004a 
>> [    1.861328][    T1] 7c095040 40810110 e93f0008 811f0028 <e9290390> e9290050 812903d8 7d3e4850 
>> [    1.863000][    T1] ---[ end trace c49ca2d91ee47d7f ]---
>> [    1.879456][    T1] 
>> [    2.880941][    T1] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
>>
>> I don't know what caused this, but it is some change since Friday.
>>
>> I have left it like this.
> 
> Bisections leads to commit
> 
>   42fb54fbc707 ("bio: limit bio max size")
> 
> from the block tree.  Reverting that commit on top of today's
> linux-next allows to the boot to work again.

The patch has been dropped, thanks Stephen.

-- 
Jens Axboe