================================================================== BUG: KCSAN: data-race in snd_seq_check_queue / snd_seq_control_queue write to 0xffff8880924f2364 of 1 bytes by interrupt on cpu 1: queue_access_unlock sound/core/seq/seq_queue.c:367 [inline] snd_seq_control_queue+0x15a/0x320 sound/core/seq/seq_queue.c:726 event_input_timer+0x29/0x40 sound/core/seq/seq_system.c:103 snd_seq_deliver_single_event.constprop.0+0x403/0x500 sound/core/seq/seq_clientmgr.c:638 snd_seq_deliver_event+0x2eb/0x4b0 sound/core/seq/seq_clientmgr.c:839 snd_seq_dispatch_event+0x9d/0x300 sound/core/seq/seq_clientmgr.c:913 snd_seq_check_queue+0xf3/0x210 sound/core/seq/seq_queue.c:262 snd_seq_timer_interrupt+0x222/0x260 sound/core/seq/seq_timer.c:158 snd_timer_process_callbacks+0x1eb/0x230 sound/core/timer.c:796 snd_timer_interrupt sound/core/timer.c:919 [inline] snd_timer_interrupt+0x488/0x950 sound/core/timer.c:840 snd_hrtimer_callback+0x188/0x250 sound/core/hrtimer.c:50 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x271/0x600 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x226/0x490 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline] smp_apic_timer_interrupt+0xd8/0x270 arch/x86/kernel/apic/apic.c:1144 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 should_watch kernel/kcsan/core.c:245 [inline] check_access kernel/kcsan/core.c:557 [inline] __tsan_read8+0xdc/0x100 kernel/kcsan/core.c:694 timespec64_sub include/linux/time64.h:89 [inline] select_estimate_accuracy+0xbd/0x1f0 fs/select.c:88 ep_poll+0x1e0/0x910 fs/eventpoll.c:1812 do_epoll_wait+0x15a/0x180 fs/eventpoll.c:2298 __do_sys_epoll_wait fs/eventpoll.c:2308 [inline] __se_sys_epoll_wait fs/eventpoll.c:2305 [inline] __x64_sys_epoll_wait+0x5a/0x70 fs/eventpoll.c:2305 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880924f2364 of 1 bytes by task 20993 on cpu 0: snd_seq_check_queue+0x59/0x210 sound/core/seq/seq_queue.c:247 snd_seq_enqueue_event+0x15a/0x2a0 sound/core/seq/seq_queue.c:330 snd_seq_client_enqueue_event.constprop.0+0x187/0x2a0 sound/core/seq/seq_clientmgr.c:974 snd_seq_write+0x227/0x4e0 sound/core/seq/seq_clientmgr.c:1093 __vfs_write+0x58/0xb0 fs/read_write.c:494 vfs_write fs/read_write.c:558 [inline] vfs_write+0x189/0x380 fs/read_write.c:542 ksys_write+0x16a/0x1a0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x49/0x60 fs/read_write.c:620 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 20993 Comm: syz-executor.3 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================