================================================================== BUG: KCSAN: data-race in snd_rawmidi_kernel_write1 / snd_rawmidi_poll write to 0xffff8880103e2c38 of 8 bytes by task 10445 on cpu 1: snd_rawmidi_kernel_write1+0x207/0x440 sound/core/rawmidi.c:1378 snd_rawmidi_write+0x31b/0x6b0 sound/core/rawmidi.c:1452 vfs_write+0x1d0/0x6b0 fs/read_write.c:584 ksys_write+0xce/0x180 fs/read_write.c:639 __do_sys_write fs/read_write.c:651 [inline] __se_sys_write fs/read_write.c:648 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:648 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880103e2c38 of 8 bytes by task 10455 on cpu 0: snd_rawmidi_ready sound/core/rawmidi.c:102 [inline] snd_rawmidi_poll+0x1ce/0x210 sound/core/rawmidi.c:1506 vfs_poll include/linux/poll.h:90 [inline] do_select+0x8e4/0xf30 fs/select.c:534 core_sys_select+0x41f/0x670 fs/select.c:677 do_pselect fs/select.c:759 [inline] __do_sys_pselect6+0x1d1/0x230 fs/select.c:800 __se_sys_pselect6 fs/select.c:791 [inline] __x64_sys_pselect6+0x74/0x80 fs/select.c:791 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 10455 Comm: syz-executor.0 Not tainted 5.9.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================