Message-ID: <CA+G9fYs5AdVM-T2Tf3LciNCwLZEHetcnSkHsjZajVwwpM2HmJw@mail.gmail.com>
Date: Wed, 23 Jul 2025 17:14:28 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: linux-fsdevel@...r.kernel.org, linux-mm <linux-mm@...ck.org>, 
	linux-xfs@...r.kernel.org, open list <linux-kernel@...r.kernel.org>, 
	lkft-triage@...ts.linaro.org, Linux Regressions <regressions@...ts.linux.dev>
Cc: Miklos Szeredi <miklos@...redi.hu>, Jan Kara <jack@...e.cz>, 
	Andrew Morton <akpm@...ux-foundation.org>, Christian Brauner <brauner@...nel.org>, 
	"Darrick J. Wong" <djwong@...nel.org>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
	"Liam R. Howlett" <liam.howlett@...cle.com>, 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-20250721 arm64 16K and 64K page size WARNING fs fuse file.c at fuse_iomap_writeback_range

Regressions found while running LTP msync04 tests on qemu-arm64 running
Linux next-20250721, next-20250722 and next-20250723 with 16K and 64K
page size enabled builds.

CONFIG_ARM64_64K_PAGES=y ( kernel warning as below )
CONFIG_ARM64_16K_PAGES=y ( kernel warning as below )

No warning noticed with 4K page size.
CONFIG_ARM64_4K_PAGES=y works as expected


First seen on the tag next-20250721.
Good: next-20250718
Bad:  next-20250721 to next-20250723

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

Test regression: next-20250721 arm64 16K and 64K page size WARNING fs
fuse file.c at fuse_iomap_writeback_range

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

## Test log
------------[ cut here ]------------
[  343.828105] WARNING: fs/fuse/file.c:2146 at
fuse_iomap_writeback_range+0x478/0x558 [fuse], CPU#0: msync04/4190
[  343.830969] Modules linked in: btrfs blake2b_generic xor xor_neon
raid6_pq zstd_compress sm3_ce sha3_ce drm fuse backlight ip_tables
x_tables
[  343.833830] CPU: 0 UID: 0 PID: 4190 Comm: msync04 Not tainted
6.16.0-rc7-next-20250723 #1 PREEMPT
[  343.834736] Hardware name: linux,dummy-virt (DT)
[  343.835788] pstate: 03402009 (nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
[  343.836455] pc : fuse_iomap_writeback_range+0x478/0x558 fuse
[  343.837294] lr : iomap_writeback_folio (fs/iomap/buffered-io.c:1586
fs/iomap/buffered-io.c:1710)
[  343.838178] sp : ffff80008b26f8d0
[  343.838668] x29: ffff80008b26f8d0 x28: fff00000e7f8c800 x27: 0000000000000000
[  343.839391] x26: fff00000d4b30000 x25: 0000000000000000 x24: 0000000000000000
[  343.840305] x23: 0000000000000000 x22: fffffc1fc0334200 x21: 0000000000001000
[  343.840928] x20: ffff80008b26fa00 x19: 0000000000000000 x18: 0000000000000000
[  343.841782] x17: 0000000000000000 x16: ffffb8d3b90c67c8 x15: 0000000000000000
[  343.842565] x14: ffffb8d3ba91e340 x13: 0000ffff8ff3ffff x12: 0000000000000000
[  343.843002] x11: 1ffe000004b74a21 x10: fff0000025ba510c x9 : ffffb8d3b90c6308
[  343.843962] x8 : ffff80008b26f788 x7 : ffffb8d365830b90 x6 : ffffb8d3bb6c9000
[  343.844718] x5 : 0000000000000000 x4 : 000000000000000a x3 : 0000000000001000
[  343.845333] x2 : fff00000c0b5ecc0 x1 : 000000000000ffff x0 : 0bfffe000000400b
[  343.846323] Call trace:
[  343.846767] fuse_iomap_writeback_range+0x478/0x558 fuse (P)
[  343.847288] iomap_writeback_folio (fs/iomap/buffered-io.c:1586
fs/iomap/buffered-io.c:1710)
[  343.847930] iomap_writepages (fs/iomap/buffered-io.c:1762)
[  343.848494] fuse_writepages+0xa0/0xe8 fuse
[  343.849112] do_writepages (mm/page-writeback.c:2634)
[  343.849614] filemap_fdatawrite_wbc (mm/filemap.c:386 mm/filemap.c:376)
[  343.850202] __filemap_fdatawrite_range (mm/filemap.c:420)
[  343.850791] file_write_and_wait_range (mm/filemap.c:794)
[  343.851108] fuse_fsync+0x6c/0x138 fuse
[  343.851688] vfs_fsync_range (fs/sync.c:188)
[  343.852002] __arm64_sys_msync (mm/msync.c:96 mm/msync.c:32 mm/msync.c:32)
[  343.852197] invoke_syscall.constprop.0
(arch/arm64/include/asm/syscall.h:61 arch/arm64/kernel/syscall.c:54)
[  343.852914] do_el0_svc (include/linux/thread_info.h:135
(discriminator 2) arch/arm64/kernel/syscall.c:140 (discriminator 2)
arch/arm64/kernel/syscall.c:151 (discriminator 2))
[  343.853389] el0_svc (arch/arm64/include/asm/irqflags.h:82
(discriminator 1) arch/arm64/include/asm/irqflags.h:123 (discriminator
1) arch/arm64/include/asm/irqflags.h:136 (discriminator 1)
arch/arm64/kernel/entry-common.c:169 (discriminator 1)
arch/arm64/kernel/entry-common.c:182 (discriminator 1)
arch/arm64/kernel/entry-common.c:880 (discriminator 1))
[  343.853829] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:899)
[  343.854350] el0t_64_sync (arch/arm64/kernel/entry.S:596)
[  343.854652] ---[ end trace 0000000000000000 ]---



## 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-20250723/
* Git sha: a933d3dc1968fcfb0ab72879ec304b1971ed1b9a
* Git describe: 6.16.0-rc7-next-20250723
* kernel version: next-20250723
* Architectures: arm64
* Toolchains: gcc-13
* Kconfigs: defconfig + CONFIG_ARM64_64K_PAGES=y
* Kconfigs: defconfig + CONFIG_ARM64_16K_PAGES=y

## Test
* Test log 1: https://qa-reports.linaro.org/api/testruns/29227309/log_file/
* Test log 2: https://qa-reports.linaro.org/api/testruns/29227074/log_file/
* Test run: https://regressions.linaro.org/lkft/linux-next-master/next-20250723/testruns/1713367/
* Test history:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250723/testrun/29227309/suite/log-parser-test/test/exception-warning-fsfusefile-at-fuse_iomap_writeback_range/history/
* Test plan: https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/tests/30G3hpJVVdXkZKnB15v1qoQOL03
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/30G3dvSFyHHQ3E8CvKH7tjU98I6/
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/30G3dvSFyHHQ3E8CvKH7tjU98I6/config

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

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