[next] [arm64] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000068

[Jens Axboe]

On 6/15/21 5:26 PM, Andrew Morton wrote:
> (cc Jens)
> 
> On Tue, 15 Jun 2021 16:49:50 +0530 Naresh Kamboju <naresh.kamboju at linaro.org> wrote:
> 
>> Following kernel crash reported while booting linux next 20210615 tag
>> on qemu_arm64.
>>
>> Crash log:
>> -------------
>> [    0.767379] Unable to handle kernel NULL pointer dereference at
>> virtual address 0000000000000068
>> [    0.769815] Mem abort info:
>> [    0.770735]   ESR = 0x96000004
>> [    0.771598]   EC = 0x25: DABT (current EL), IL = 32 bits
>> [    0.773008]   SET = 0, FnV = 0
>> [    0.773865]   EA = 0, S1PTW = 0
>> [    0.774844]   FSC = 0x04: level 0 translation fault
>> [    0.776195] Data abort info:
>> [    0.776968]   ISV = 0, ISS = 0x00000004
>> [    0.778010]   CM = 0, WnR = 0
>> [    0.778961] [0000000000000068] user address but active_mm is swapper
>> [    0.780643] Internal error: Oops: 96000004 [#1] PREEMPT SMP
>> [    0.782189] Modules linked in:
>> [    0.783098] CPU: 2 PID: 1 Comm: swapper/0 Not tainted
>> 5.13.0-rc6-next-20210615 #1
>> [    0.785239] Hardware name: linux,dummy-virt (DT)
>> [    0.786626] pstate: 00000005 (nzcv daif -PAN -UAO -TCO BTYPE=--)
>> [    0.788352] pc : blk_finish_plug+0x88/0x270
>> [    0.789598] lr : blk_queue_write_cache+0x34/0x80
>> [    0.790997] sp : ffff800012aeb9d0
>> [    0.791981] x29: ffff800012aeb9d0 x28: ffff0000c088eeb0 x27: ffff800011a27110
>> [    0.794067] x26: ffff0000c18511a0 x25: ffff8000114ecaa8 x24: 0000000005a00000
>> [    0.796127] x23: ffff8000114ed3c8 x22: 0000000000000000 x21: ffff0000c088fa00
>> [    0.798208] x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000000001
>> [    0.800239] x17: 7265727574636166 x16: 756e614d202e6b6e x15: ffff0000c0290488
>> [    0.802308] x14: ffffffffffffffff x13: ffff0000c088fa2c x12: ffff0000c088fa14
>> [    0.804341] x11: 0000000000000026 x10: 0000000000000401 x9 : ffff80001058247c
>> [    0.806408] x8 : ffff0000c088fa2c x7 : 0000000000000008 x6 : 0000000000000001
>> [    0.808429] x5 : ffff80001258a000 x4 : ffff80001258a260 x3 : 0000000000000068
>> [    0.810492] x2 : 0000000000000001 x1 : 0000000000000068 x0 : 0000000000020000
>> [    0.813153] Call trace:
>> [    0.813878]  blk_finish_plug+0x88/0x270
>> [    0.815064]  add_mtd_blktrans_dev+0x258/0x3f0
>> [    0.816316]  mtdblock_add_mtd+0x6c/0xb8
>> [    0.817428]  blktrans_notify_add+0x50/0x78
>> [    0.818666]  add_mtd_device+0x304/0x4d8
>> [    0.819790]  mtd_device_parse_register+0x1d8/0x2f0
>> [    0.821150]  physmap_flash_probe+0x4c8/0x7a8
>> [    0.822431]  platform_probe+0x70/0xe0
>> [    0.823494]  really_probe+0xf0/0x4d0
>> [    0.824539]  driver_probe_device+0x108/0x178
>> [    0.825760]  device_driver_attach+0x7c/0x88
>> [    0.827039]  __driver_attach+0xb8/0x190
>> [    0.828142]  bus_for_each_dev+0x78/0xd0
>> [    0.829254]  driver_attach+0x2c/0x38
>> [    0.830381]  bus_add_driver+0x14c/0x230
>> [    0.831502]  driver_register+0x6c/0x128
>> [    0.832604]  __platform_driver_register+0x30/0x40
>> [    0.833952]  physmap_init+0x24/0x30
>> [    0.835011]  do_one_initcall+0x50/0x2c8
>> [    0.836116]  kernel_init_freeable+0x25c/0x2e4
>> [    0.837366]  kernel_init+0x2c/0x138
>> [    0.838403]  ret_from_fork+0x10/0x18
>> [    0.839453] Code: c8037c22 35ffffa3 17fff238 f9800031 (c85f7c22)
>> [    0.841176] ---[ end trace 66ee8a40712bfd28 ]---
>> [    0.842563] Kernel panic - not syncing: Attempted to kill init!
>> exitcode=0x0000000b
>> [    0.844577] SMP: stopping secondary CPUs
>> [    0.845707] Kernel Offset: disabled
>> [    0.846731] CPU features: 0x10000071,00000846
>> [    0.847969] Memory Limit: none
>> [    0.848853] ---[ end Kernel panic - not syncing: Attempted to kill
>> init! exitcode=0x0000000b ]---

Should be fixed once linux-next resyncs with the block tree.

-- 
Jens Axboe