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BUG: KCSAN: data-race in next_uptodate_page / shmem_write_end

write to 0xffff8881035861d8 of 8 bytes by task 7356 on cpu 1:
 i_size_write include/linux/fs.h:886 [inline]
 shmem_write_end+0x59/0x380 mm/shmem.c:2567
 generic_perform_write+0x264/0x3f0 mm/filemap.c:3783
 __generic_file_write_iter+0xe3/0x280 mm/filemap.c:3900
 generic_file_write_iter+0x79/0x1c0 mm/filemap.c:3932
 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 0xffff8881035861d8 of 8 bytes by task 7361 on cpu 0:
 i_size_read include/linux/fs.h:864 [inline]
 next_uptodate_page+0x2d3/0x520 mm/filemap.c:3327
 next_map_page mm/filemap.c:3352 [inline]
 filemap_map_pages+0x776/0x890 mm/filemap.c:3424
 do_fault_around mm/memory.c:4483 [inline]
 do_read_fault mm/memory.c:4509 [inline]
 do_fault+0x421/0xaf0 mm/memory.c:4643
 handle_pte_fault mm/memory.c:4931 [inline]
 __handle_mm_fault mm/memory.c:5073 [inline]
 handle_mm_fault+0x8c5/0xb20 mm/memory.c:5219
 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_enhanced_fast_string+0xa/0x40 arch/x86/lib/copy_user_64.S:165
 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]
 __get_filter+0xc7/0x210 net/core/filter.c:1499
 sk_attach_filter+0x21/0x270 net/core/filter.c:1530
 sk_setsockopt+0x12a0/0x1cc0 net/core/sock.c:1297
 sock_setsockopt+0x38/0x50 net/core/sock.c:1549
 __sys_setsockopt+0x17c/0x230 net/socket.c:2242
 __do_sys_setsockopt net/socket.c:2257 [inline]
 __se_sys_setsockopt net/socket.c:2254 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2254
 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: 0x0000000000002d28 -> 0x0000000000002d46

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7361 Comm: syz-executor.4 Not tainted 6.2.0-rc4-syzkaller-00069-g081edded9b38-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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