linux-kernel - Re: [next] [arm64] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000068

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Message-Id: <20210615162641.be9d7a676df5885394713d25@linux-foundation.org>
Date:   Tue, 15 Jun 2021 16:26:41 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        Will Deacon <will@...nel.org>, lkft-triage@...ts.linaro.org,
        regressions@...ts.linux.dev,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Arnd Bergmann <arnd@...db.de>,
        Ard Biesheuvel <ardb@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [next] [arm64] Unable to handle kernel NULL pointer dereference
 at virtual address 0000000000000068

(cc Jens)

On Tue, 15 Jun 2021 16:49:50 +0530 Naresh Kamboju <naresh.kamboju@...aro.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 ]---
> 
> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> 
> ref:
> https://lkft.validation.linaro.org/scheduler/job/2901452#L556
> 
> metadata:
>   git branch: master
>   git repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
>   git describe: next-20210615
>   kernel-config: https://builds.tuxbuild.com/1tyksDCCPiTvc0x6psxC3JvSWqJ/config
> 
> build link:
>     https://builds.tuxbuild.com/1tyksDCCPiTvc0x6psxC3JvSWqJ/
> 
> Steps to reproduce:
> --------------------------
> # TuxMake is a command line tool and Python library that provides
> # portable and repeatable Linux kernel builds across a variety of
> # architectures, toolchains, kernel configurations, and make targets.
> #
> # TuxMake supports the concept of runtimes.
> # See https://docs.tuxmake.org/runtimes/, for that to work it requires
> # that you install podman or docker on your system.
> #
> # To install tuxmake on your system globally:
> # sudo pip3 install -U tuxmake
> #
> # See https://docs.tuxmake.org/ for complete documentation.
> 
> 
> tuxmake --runtime podman --target-arch arm64 --toolchain gcc-9
> --kconfig defconfig --kconfig-add
> https://builds.tuxbuild.com/1tyksDCCPiTvc0x6psxC3JvSWqJ/config
> 
> --
> Linaro LKFT
> https://lkft.linaro.org