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BUG: KCSAN: data-race in filemap_read / filemap_read

write to 0xffff88813d0ad190 of 8 bytes by task 28521 on cpu 1:
 filemap_read+0x60b/0x680 mm/filemap.c:2672
 generic_file_read_iter+0x78/0x330 mm/filemap.c:2784
 ext4_file_read_iter+0x1d8/0x2a0
 do_iter_readv_writev+0x2b0/0x330
 vfs_readv+0x1e5/0x640 fs/read_write.c:932
 do_preadv fs/read_write.c:1049 [inline]
 __do_sys_preadv fs/read_write.c:1099 [inline]
 __se_sys_preadv fs/read_write.c:1094 [inline]
 __x64_sys_preadv+0x100/0x1c0 fs/read_write.c:1094
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff88813d0ad190 of 8 bytes by task 28519 on cpu 0:
 filemap_read+0x89/0x680 mm/filemap.c:2570
 generic_file_read_iter+0x78/0x330 mm/filemap.c:2784
 ext4_file_read_iter+0x1d8/0x2a0
 do_iter_readv_writev+0x2b0/0x330
 vfs_readv+0x1e5/0x640 fs/read_write.c:932
 do_preadv fs/read_write.c:1049 [inline]
 __do_sys_preadv fs/read_write.c:1099 [inline]
 __se_sys_preadv fs/read_write.c:1094 [inline]
 __x64_sys_preadv+0x100/0x1c0 fs/read_write.c:1094
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000100000080 -> 0x0000000000001009

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 28519 Comm: syz-executor.4 Not tainted 6.8.0-rc7-syzkaller-00238-g005f6f34bd47 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
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