From: Krzysztof Kozlowski <krzk@kernel.org>
To: dhowells@redhat.com, ebiggers@google.com,
viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org,
"linux-samsung-soc@vger.kernel.org"
<linux-samsung-soc@vger.kernel.org>
Subject: Re: [BUG BISECT] NFS root failure (NULL pointer)
Date: Mon, 10 Sep 2018 08:44:15 +0200 [thread overview]
Message-ID: <CAJKOXPfc5O0c6HBtM=h2NUXwaiCWVgFC9eVeirLYynfUpU6d3Q@mail.gmail.com> (raw)
In-Reply-To: <CAJKOXPc49jh8RCDvn2Meci9iDcnnwGEHo6F7RuhkXpen=f_E8w@mail.gmail.com>
On Thu, 6 Sep 2018 at 09:10, Krzysztof Kozlowski <krzk@kernel.org> wrote:
>
> Hi,
>
> Today's next fails to mount NFS root under my ARM targets and fails to
> mount root from file image under QMU.
>
> [ 21.512866] Unable to handle kernel NULL pointer dereference at
> virtual address 00000000
> [ 21.695484] [<c03bcc04>] (nfs_fs_mount) from [<c02cf6a4>]
> (legacy_get_tree+0x34/0xec)
> [ 21.703225] [<c02cf6a4>] (legacy_get_tree) from [<c029442c>]
> (vfs_get_tree+0x64/0x180)
> [ 21.711119] [<c029442c>] (vfs_get_tree) from [<c02b9140>]
> (do_mount+0x21c/0x958)
> [ 21.718478] [<c02b9140>] (do_mount) from [<c02b9c38>] (ksys_mount+0x8c/0xbc)
> [ 21.725513] [<c02b9c38>] (ksys_mount) from [<c0101000>]
> (ret_fast_syscall+0x0/0x28)
>
> Full log from ARM (NFS root):
> https://krzk.eu/#/builders/25/builds/750/steps/12/logs/serial0
>
> The NFS root failure bisected to:
> bae551929c5433bd56ec4dcb97c7d4a50153d357 is the first bad commit
> commit bae551929c5433bd56ec4dcb97c7d4a50153d357
> Author: David Howells <dhowells@redhat.com>
> Date: Tue Jul 10 21:43:37 2018 +0100
FYI, the bug is still present in linux-next. All boards fail to boot up.
Let me know if I can help anymore in debugging this.
Best regards,
Krzysztof
>
> vfs: Separate changing mount flags full remount
>
> Separate just the changing of mount flags (MS_REMOUNT|MS_BIND) from full
> remount because the mount data will get parsed with the new fs_context
> stuff prior to doing a remount - and this causes the syscall to fail under
> some circumstances.
>
> The QEMU issue seems slightly different and I did not bisect it. The
> QEMU just cannot find rootfs:
> [ 1.008052] Filesystem requires source device
> [ 1.008513] VFS: Cannot open root device "mmcblk0" or
> unknown-block(179,0): error -2
> [ 1.008790] Please append a correct "root=" boot option; here are
> the available partitions:
> [ 1.009300] 0100 16384 ram0
> [ 1.009337] (driver?)
> [ 1.009806] fe00 5120 vda
> [ 1.009843] driver: virtio_blk
> [ 1.010296] b300 110592 mmcblk0
> [ 1.010319] driver: mmcblk
> [ 1.010859] Kernel panic - not syncing: VFS: Unable to mount root
> fs on unknown-block(179,0)
> [ 1.011580] ---[ end Kernel panic - not syncing: VFS: Unable to
> mount root fs on unknown-block(179,0) ]---
>
>
>
> Boards config:
> 1. Arch ARM Linux
> 2. exynos_defconfig
> - Odroid HC1
> ARMv7, octa-core (Cortex-A7+A15), Exynos5422 SoC
> Systemd: v239
> - Odroid U3
> ARMv7, quad-core, Exynos4412 SoC
> Systemd: v238
> - Odroid XU
> ARMv7, octa-core (Cortex-A7+A15) but only A15 working, Exynos5410 SoC
> Systemd: v236
> - Odroid XU3
> ARMv7, octa-core (Cortex-A7+A15), Exynos5422 SoC
> Systemd: v236
> 3. Custom VF50 defconfig
> - Toradex Colibri VF50 on Iris board
> ARMv7, UP, Cortext-A5, NXP VF500
> Systemd: v232
> 4. All boards boot from TFTP with NFS root (NFSv4)
> 5. QEMU
> ARMv7, vexpress-v2p-ca9, 128 MB RAM
>
>
>
> Best regards,
> Krzysztof
next prev parent reply other threads:[~2018-09-10 11:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-06 7:10 [BUG BISECT] NFS root failure (NULL pointer) Krzysztof Kozlowski
2018-09-10 6:44 ` Krzysztof Kozlowski [this message]
2018-09-10 6:46 ` Krzysztof Kozlowski
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