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BUG: KCSAN: data-race in filemap_read / filemap_read

write to 0xffff8881357f4790 of 8 bytes by task 27571 on cpu 1:
 filemap_read+0x44c/0x670 mm/filemap.c:2718
 generic_file_read_iter+0x78/0x340 mm/filemap.c:2842
 ext4_file_read_iter+0x1d8/0x2a0
 do_iter_read+0x4ac/0x7c0 fs/read_write.c:795
 vfs_readv fs/read_write.c:915 [inline]
 do_preadv+0x159/0x230 fs/read_write.c:1007
 __do_sys_preadv fs/read_write.c:1057 [inline]
 __se_sys_preadv fs/read_write.c:1052 [inline]
 __x64_sys_preadv+0x58/0x60 fs/read_write.c:1052
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

write to 0xffff8881357f4790 of 8 bytes by task 27567 on cpu 0:
 filemap_read+0x44c/0x670 mm/filemap.c:2718
 generic_file_read_iter+0x78/0x340 mm/filemap.c:2842
 ext4_file_read_iter+0x1d8/0x2a0
 do_iter_read+0x4ac/0x7c0 fs/read_write.c:795
 vfs_readv fs/read_write.c:915 [inline]
 do_preadv+0x159/0x230 fs/read_write.c:1007
 __do_sys_preadv fs/read_write.c:1057 [inline]
 __se_sys_preadv fs/read_write.c:1052 [inline]
 __x64_sys_preadv+0x58/0x60 fs/read_write.c:1052
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000001cf000 -> 0x00000000001d1000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 27567 Comm: syz-executor.3 Not tainted 6.5.0-syzkaller-01810-gf97e18a3f2fb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
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