==================================================================
BUG: KCSAN: data-race in filemap_read / filemap_read

read to 0xffff8881095cc990 of 8 bytes by task 7630 on cpu 1:
 filemap_read+0x89/0x680 mm/filemap.c:2570
 generic_file_read_iter+0x78/0x330 mm/filemap.c:2784
 ext4_file_read_iter+0x1d8/0x2a0
 call_read_iter include/linux/fs.h:2081 [inline]
 copy_splice_read+0x39f/0x5d0 fs/splice.c:365
 do_splice_read fs/splice.c:984 [inline]
 splice_direct_to_actor+0x288/0x660 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3b9/0x960 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 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

write to 0xffff8881095cc990 of 8 bytes by task 7631 on cpu 0:
 filemap_read+0x60b/0x680 mm/filemap.c:2672
 generic_file_read_iter+0x78/0x330 mm/filemap.c:2784
 ext4_file_read_iter+0x1d8/0x2a0
 call_read_iter include/linux/fs.h:2081 [inline]
 copy_splice_read+0x39f/0x5d0 fs/splice.c:365
 do_splice_read fs/splice.c:984 [inline]
 splice_direct_to_actor+0x288/0x660 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3b9/0x960 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 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: 0x000000000203bdb3 -> 0x000000000203bdeb

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7631 Comm: syz-executor.0 Not tainted 6.8.0-rc6-syzkaller-00120-g87adedeba51a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
==================================================================
==================================================================
BUG: KCSAN: data-race in filemap_read / filemap_read

write to 0xffff8881095cc990 of 8 bytes by task 7630 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
 call_read_iter include/linux/fs.h:2081 [inline]
 copy_splice_read+0x39f/0x5d0 fs/splice.c:365
 do_splice_read fs/splice.c:984 [inline]
 splice_direct_to_actor+0x288/0x660 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3b9/0x960 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 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

write to 0xffff8881095cc990 of 8 bytes by task 7631 on cpu 0:
 filemap_read+0x60b/0x680 mm/filemap.c:2672
 generic_file_read_iter+0x78/0x330 mm/filemap.c:2784
 ext4_file_read_iter+0x1d8/0x2a0
 call_read_iter include/linux/fs.h:2081 [inline]
 copy_splice_read+0x39f/0x5d0 fs/splice.c:365
 do_splice_read fs/splice.c:984 [inline]
 splice_direct_to_actor+0x288/0x660 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3b9/0x960 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 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: 0x0000000002081e77 -> 0x0000000002081ecb

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7631 Comm: syz-executor.0 Not tainted 6.8.0-rc6-syzkaller-00120-g87adedeba51a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
==================================================================