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BUG: KCSAN: data-race in next_uptodate_page / shmem_write_end

write to 0xffff888154b0e160 of 8 bytes by task 17725 on cpu 1:
 i_size_write include/linux/fs.h:886 [inline]
 shmem_write_end+0x59/0x380 mm/shmem.c:2538
 generic_perform_write+0x264/0x3f0 mm/filemap.c:3764
 __generic_file_write_iter+0xe3/0x280 mm/filemap.c:3881
 generic_file_write_iter+0x79/0x1c0 mm/filemap.c:3913
 do_iter_write+0x494/0x750 fs/read_write.c:861
 vfs_iter_write+0x4c/0x70 fs/read_write.c:902
 iter_file_splice_write+0x44a/0x7c0 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:931
 splice_direct_to_actor+0x305/0x620 fs/splice.c:886
 do_splice_direct+0xfb/0x180 fs/splice.c:974
 do_sendfile+0x3bf/0x910 fs/read_write.c:1255
 __do_sys_sendfile64 fs/read_write.c:1317 [inline]
 __se_sys_sendfile64 fs/read_write.c:1309 [inline]
 __x64_sys_sendfile64+0xb9/0x150 fs/read_write.c:1309
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888154b0e160 of 8 bytes by task 17726 on cpu 0:
 i_size_read include/linux/fs.h:864 [inline]
 next_uptodate_page+0x2d4/0x520 mm/filemap.c:3308
 next_map_page mm/filemap.c:3333 [inline]
 filemap_map_pages+0x776/0x890 mm/filemap.c:3405
 do_fault_around mm/memory.c:4523 [inline]
 do_read_fault mm/memory.c:4549 [inline]
 do_fault+0x421/0xaf0 mm/memory.c:4683
 handle_pte_fault mm/memory.c:4955 [inline]
 __handle_mm_fault mm/memory.c:5097 [inline]
 handle_mm_fault+0x877/0xa80 mm/memory.c:5218
 do_user_addr_fault+0x4a1/0x980 arch/x86/mm/fault.c:1428
 handle_page_fault arch/x86/mm/fault.c:1519 [inline]
 exc_page_fault+0x60/0x160 arch/x86/mm/fault.c:1575
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
 copy_user_short_string+0xa/0x40 arch/x86/lib/copy_user_64.S:231
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline]
 _copy_from_user+0x78/0xc0 lib/usercopy.c:16
 copy_from_user include/linux/uaccess.h:161 [inline]
 move_addr_to_kernel+0x7e/0x110 net/socket.c:249
 __sys_connect+0x70/0x1b0 net/socket.c:1991
 __do_sys_connect net/socket.c:2003 [inline]
 __se_sys_connect net/socket.c:2000 [inline]
 __x64_sys_connect+0x3d/0x50 net/socket.c:2000
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x000000000000765c -> 0x0000000000007684

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17726 Comm: syz-executor.0 Not tainted 6.0.0-syzkaller-12255-g2df76606db9d-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
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