================================================================== BUG: KCSAN: data-race in snd_rawmidi_kernel_write1 / snd_rawmidi_write write to 0xffff88811e9439f8 of 8 bytes by task 10487 on cpu 1: snd_rawmidi_kernel_write1+0x1e1/0x430 sound/core/rawmidi.c:1378 snd_rawmidi_write+0x31b/0x6b0 sound/core/rawmidi.c:1452 __vfs_write+0x69/0x340 fs/read_write.c:495 __kernel_write+0xd1/0x240 fs/read_write.c:516 write_pipe_buf+0x96/0xc0 fs/splice.c:799 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x1f7/0x4f0 fs/splice.c:626 splice_from_pipe fs/splice.c:661 [inline] default_file_splice_write fs/splice.c:811 [inline] do_splice_from fs/splice.c:847 [inline] direct_splice_actor+0xee/0x160 fs/splice.c:1016 splice_direct_to_actor+0x365/0x660 fs/splice.c:971 do_splice_direct+0xf2/0x170 fs/splice.c:1059 do_sendfile+0x562/0xb10 fs/read_write.c:1521 __do_sys_sendfile64 fs/read_write.c:1582 [inline] __se_sys_sendfile64 fs/read_write.c:1568 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1568 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88811e9439f8 of 8 bytes by task 10491 on cpu 0: snd_rawmidi_write+0x2dd/0x6b0 sound/core/rawmidi.c:1447 __vfs_write+0x69/0x340 fs/read_write.c:495 __kernel_write+0xd1/0x240 fs/read_write.c:516 write_pipe_buf+0x96/0xc0 fs/splice.c:799 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x1f7/0x4f0 fs/splice.c:626 splice_from_pipe fs/splice.c:661 [inline] default_file_splice_write fs/splice.c:811 [inline] do_splice_from fs/splice.c:847 [inline] direct_splice_actor+0xee/0x160 fs/splice.c:1016 splice_direct_to_actor+0x365/0x660 fs/splice.c:971 do_splice_direct+0xf2/0x170 fs/splice.c:1059 do_sendfile+0x562/0xb10 fs/read_write.c:1521 __do_sys_sendfile64 fs/read_write.c:1582 [inline] __se_sys_sendfile64 fs/read_write.c:1568 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1568 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 10491 Comm: syz-executor.3 Not tainted 5.8.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================