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@linaro.org

## Boot log

[ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd034] [ 0.000000] Linux version 6.16.0-rc6-next-20250717 (tuxmake@tuxmake) (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... * Test plan: https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/tests/2zzwHDuV3xv... * Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2zzwEbz0aS3AtluE2oRQ9... * Kernel config: https://storage.tuxsuite.com/public/linaro/lkft/builds/2zzwEbz0aS3AtluE2oRQ9...

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