================================================================== BUG: KCSAN: data-race in snd_rawmidi_poll / snd_rawmidi_transmit write to 0xffff88807fb63878 of 8 bytes by task 3256 on cpu 1: __snd_rawmidi_transmit_ack sound/core/rawmidi.c:1255 [inline] snd_rawmidi_transmit+0x2e6/0x410 sound/core/rawmidi.c:1314 snd_vmidi_output_work+0xf1/0x200 sound/core/seq/seq_virmidi.c:144 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x20d/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff88807fb63878 of 8 bytes by task 26484 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+0x8f6/0xf70 fs/select.c:534 core_sys_select+0x3e3/0x610 fs/select.c:677 do_pselect fs/select.c:759 [inline] __do_sys_pselect6 fs/select.c:800 [inline] __se_sys_pselect6+0x248/0x290 fs/select.c:791 __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: 26484 Comm: syz-executor.4 Not tainted 5.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================