================================================================== BUG: KCSAN: data-race in do_select / pollwake write to 0xffffc90000edba60 of 4 bytes by task 27310 on cpu 0: __pollwake fs/select.c:197 [inline] pollwake+0xa7/0xf0 fs/select.c:217 __wake_up_common+0xbc/0x130 kernel/sched/wait.c:93 __wake_up_common_lock kernel/sched/wait.c:123 [inline] __wake_up+0x80/0xc0 kernel/sched/wait.c:142 snd_seq_cell_free+0x1e4/0x220 sound/core/seq/seq_memory.c:198 snd_seq_dispatch_event+0x156/0x270 sound/core/seq/seq_clientmgr.c:914 snd_seq_check_queue+0xfe/0x290 sound/core/seq/seq_queue.c:264 snd_seq_enqueue_event+0x275/0x2b0 sound/core/seq/seq_queue.c:333 snd_seq_client_enqueue_event+0x206/0x2a0 sound/core/seq/seq_clientmgr.c:974 snd_seq_write+0x435/0x550 sound/core/seq/seq_clientmgr.c:1093 __vfs_write+0x69/0x340 fs/read_write.c:495 vfs_write+0x19b/0x350 fs/read_write.c:559 ksys_write+0xce/0x180 fs/read_write.c:612 __do_sys_write fs/read_write.c:624 [inline] __se_sys_write fs/read_write.c:621 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:621 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffffc90000edba60 of 4 bytes by task 27321 on cpu 1: poll_schedule_timeout fs/select.c:242 [inline] do_select+0xea6/0xf70 fs/select.c:603 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+0x51/0xb0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 27321 Comm: syz-executor.5 Not tainted 5.8.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================