==================================================================
BUG: KCSAN: data-race in next_uptodate_folio / shmem_write_end

write to 0xffff88813557d270 of 8 bytes by task 16632 on cpu 0:
 i_size_write include/linux/fs.h:932 [inline]
 shmem_write_end+0x9a/0x470 mm/shmem.c:2743
 generic_perform_write+0x267/0x410 mm/filemap.c:3938
 shmem_file_write_iter+0xc8/0xe0 mm/shmem.c:2895
 call_write_iter include/linux/fs.h:2020 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x48a/0x790 fs/read_write.c:584
 ksys_write+0xeb/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff88813557d270 of 8 bytes by task 16640 on cpu 1:
 i_size_read include/linux/fs.h:910 [inline]
 next_uptodate_folio+0x5c9/0x7a0 mm/filemap.c:3417
 filemap_map_pages+0x708/0x900 mm/filemap.c:3565
 do_fault_around mm/memory.c:4587 [inline]
 do_read_fault mm/memory.c:4620 [inline]
 do_fault mm/memory.c:4763 [inline]
 do_pte_missing mm/memory.c:3731 [inline]
 handle_pte_fault mm/memory.c:5039 [inline]
 __handle_mm_fault mm/memory.c:5180 [inline]
 handle_mm_fault+0x1239/0x2dd0 mm/memory.c:5345
 faultin_page mm/gup.c:956 [inline]
 __get_user_pages+0x402/0xe40 mm/gup.c:1239
 populate_vma_page_range mm/gup.c:1677 [inline]
 __mm_populate+0x216/0x330 mm/gup.c:1786
 mm_populate include/linux/mm.h:3379 [inline]
 vm_mmap_pgoff+0x1a7/0x240 mm/util.c:561
 ksys_mmap_pgoff+0x2b8/0x330 mm/mmap.c:1425
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000000ef9000 -> 0x0000000000efa000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16640 Comm: syz-executor.2 Tainted: G        W          6.7.0-rc8-syzkaller-00024-gac865f00af29 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
==================================================================
loop2: detected capacity change from 0 to 2048
FAT-fs (loop2): Unrecognized mount option "ÿÿÿÿÿÿÿÿ184467440737095516150xffffffffffffffff" or missing value