linux-kernel - next-20250717: arm64: rk3399-rock-pi-4b: NFS mount failure with 64K page size

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Message-ID: <CA+G9fYupPsQoBrtF=-WT0nSy6m+yG1p9m68Z18Bp-Y=QMFD_tQ@mail.gmail.com>
Date: Tue, 22 Jul 2025 19:59:11 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: linux-rockchip@...ts.infradead.org, linux-mm <linux-mm@...ck.org>, 
	Netdev <netdev@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>, 
	lkft-triage@...ts.linaro.org, Linux Regressions <regressions@...ts.linux.dev>
Cc: Heiko Stuebner <heiko@...ech.de>, Andrew Morton <akpm@...ux-foundation.org>, 
	"David S. Miller" <davem@...emloft.net>, Arnd Bergmann <arnd@...db.de>, 
	Dan Carpenter <dan.carpenter@...aro.org>, Anders Roxell <anders.roxell@...aro.org>, 
	Ben Copeland <benjamin.copeland@...aro.org>
Subject: next-20250717: arm64: rk3399-rock-pi-4b: NFS mount failure with 64K
 page size

The rk3399-rock-pi-4b device fails to mount the root filesystem over
NFS when the kernel is built with 64K page size.
CONFIG_ARM64_64K_PAGES=y

This regression was first observed with the Linux next-20250717 tag
and continues to persist through next-20250722.

Device: rk3399-rock-pi-4b
Build Configuration: lkftconfig-64k_page_size

Regression Window:

 Good: next-20250716
 Bad: next-20250717.. Still Bad: next-20250722

Kernel Config Impact:
CONFIG_ARM64_64K_PAGES=y  - NFS mount fails
CONFIG_ARM64_4K_PAGES=y  - NFS mount works as expected

Regression Analysis:
- New regression? Yes
- Reproducibility? Yes

Boot regression:  next-20250717 arm64 rk3399-rock-pi-4b NFS mount
failure with 64K page size

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

## Boot log

[    0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd034]
[    0.000000] Linux version 6.16.0-rc6-next-20250717
(tuxmake@...make) (aarch64-linux-gnu-gcc (Debian 13.3.0-16) 13.3.0,
GNU ld (GNU Binutils for Debian) 2.44) #1 SMP PREEMPT @1752747461
[    0.000000] KASLR disabled due to lack of seed
[    0.000000] Machine model: Radxa ROCK Pi 4B
[    0.000000] efi: UEFI not found.
[    0.000000] earlycon: uart0 at MMIO32 0x00000000ff1a0000 (options
'1500000n8')
[    0.000000] printk: legacy bootconsole [uart0] enabled
[    0.000000] OF: reserved mem: Reserved memory: No reserved-memory
node in the DT
[    0.000000] NUMA: Faking a node at [mem
0x0000000000200000-0x00000000f7ffffff]

<trim>

[    6.520442] Sending DHCP requests ..
[   13.295867] platform sdio-pwrseq: deferred probe pending:
pwrseq_simple: reset control not ready
[   13.295887] dwmmc_rockchip fe310000.mmc: IDMAC supports 32-bit address mode.
[   13.296260] rockchip-pm-domain
ff310000.power-management:power-controller: sync_state() pending due
to fe310000.mmc
[   13.296278] rockchip-pm-domain
ff310000.power-management:power-controller: sync_state() pending due
to ff650000.video-codec
[   13.297085] dwmmc_rockchip fe310000.mmc: Using internal DMA controller.
[   13.297660] rockchip-pm-domain
ff310000.power-management:power-controller: sync_state() pending due
to ff660000.video-codec
[   13.298653] dwmmc_rockchip fe310000.mmc: Version ID is 270a
[   13.299536] rockchip-pm-domain
ff310000.power-management:power-controller: sync_state() pending due
to ff680000.rga
[   13.300164] dwmmc_rockchip fe310000.mmc: DW MMC controller at irq
49,32 bit host data width,256 deep fifo
[   13.301117] rockchip-pm-domain
ff310000.power-management:power-controller: sync_state() pending due
to ff880000.i2s
[   13.304227] rockchip-pm-domain
ff310000.power-management:power-controller: sync_state() pending due
to ff8a0000.i2s
[   13.305148] rockchip-pm-domain
ff310000.power-management:power-controller: sync_state() pending due
to ff8f0000.vop
[   13.306071] rockchip-pm-domain
ff310000.power-management:power-controller: sync_state() pending due
to ff900000.vop
[   13.307009] rockchip-pm-domain
ff310000.power-management:power-controller: sync_state() pending due
to ff940000.hdmi
[   13.307937] rockchip-pm-domain
ff310000.power-management:power-controller: sync_state() pending due
to ff9a0000.gpu
[   14.620509] ., OK
[   14.636949] IP-Config: Got DHCP answer from 10.66.16.15, my address
is 10.66.30.7
[   14.637647] IP-Config: Complete:
[   14.637955]      device=eth0, hwaddr=0a:fb:82:cd:ed:a8,
ipaddr=10.66.30.7, mask=255.255.240.0, gw=10.66.16.1
[   14.638845]      host=10.66.30.7, domain=lkftlab, nis-domain=(none)
[   14.639417]      bootserver=0.0.0.0, rootserver=10.66.16.116, rootpath=
[   14.639440]      nameserver0=10.66.16.15
[   14.641679] clk: Disabling unused clocks
[   14.646347] dw-apb-uart ff1a0000.serial: forbid DMA for kernel console
[   14.647091] check access for rdinit=/init failed: -2, ignoring
[   14.762496] VFS: Mounted root (nfs filesystem) on device 0:22.
[   14.763768] devtmpfs: mounted
[   14.775761] Freeing unused kernel memory: 4928K
[   14.776566] Run /sbin/init as init process
[   95.816464] random: crng init done
[  195.556677] nfs: server 10.66.16.116 not responding, still trying
..
[  195.556703] nfs: server 10.66.16.116 not responding, still trying
[  195.556869] nfs: server 10.66.16.116 not responding, still trying
[  195.557010] nfs: server 10.66.16.116 not responding, still trying
[  195.557055] nfs: server 10.66.16.116 not responding, still trying
[  195.557114] nfs: server 10.66.16.116 not responding, still trying
[  195.557166] nfs: server 10.66.16.116 not responding, still trying
[  195.557217] nfs: server 10.66.16.116 not responding, still trying
[  195.557269] nfs: server 10.66.16.116 not responding, still trying
[  195.557304] nfs: server 10.66.16.116 not responding, still trying
[  227.459759] nfs: server 10.66.16.116 OK
[  227.459868] nfs: server 10.66.16.116 OK
[  227.681008] nfs: server 10.66.16.116 OK
[  319.645474] nfs: server 10.66.16.116 OK
[  407.677657] nfs: server 10.66.16.116 OK
[  499.834818] nfs: server 10.66.16.116 OK
[  587.895692] nfs: server 10.66.16.116 OK
[  680.052774] nfs: server 10.66.16.116 OK
[  768.113810] nfs: server 10.66.16.116 OK
[  860.270785] nfs: server 10.66.16.116 OK
#
[  948.331418] nfs: server 10.66.16.116 OK
#
[ 1096.679211] nfs: server 10.66.16.116 OK
#
[ 1274.856436] nfs: server 10.66.16.116 OK
#
[ 1488.985700] nfs: server 10.66.16.116 OK


## Source
* Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
* Project: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250717/
* Git sha: 024e09e444bd2b06aee9d1f3fe7b313c7a2df1bb
* Git describe: 6.16.0-rc6-next-20250717
* kernel version: next-20250717
* Architectures: arm64 (rock-pi-4b)
* Toolchains: gcc-13
* Kconfigs: defconfig+64K page size

## Test
* Test log: https://qa-reports.linaro.org/api/testruns/29168904/log_file/
* Test LAVA: https://lkft.validation.linaro.org/scheduler/job/8364278#L924
* Test run: https://regressions.linaro.org/lkft/linux-next-master/next-20250717/testruns/1662101/
* Test plan: https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/tests/2zzwHDuV3xvZBKkAtqlmroSxuIS
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2zzwEbz0aS3AtluE2oRQ9gMvFTY/
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/2zzwEbz0aS3AtluE2oRQ9gMvFTY/config


--
Linaro LKFT
https://lkft.linaro.org