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@linaro.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
Test
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