================================================================== BUG: KCSAN: data-race in snd_seq_check_queue / snd_seq_control_queue write to 0xffff888121e5fc64 of 1 bytes by interrupt on cpu 1: snd_seq_check_queue+0x251/0x290 sound/core/seq/seq_queue.c:283 snd_seq_timer_interrupt+0x228/0x240 sound/core/seq/seq_timer.c:158 snd_timer_process_callbacks sound/core/timer.c:796 [inline] snd_timer_interrupt+0xa7c/0xb50 sound/core/timer.c:919 snd_hrtimer_callback+0x13a/0x220 sound/core/hrtimer.c:50 __run_hrtimer+0x154/0x4b0 kernel/time/hrtimer.c:1524 __hrtimer_run_queues kernel/time/hrtimer.c:1588 [inline] hrtimer_interrupt+0x37c/0xa40 kernel/time/hrtimer.c:1650 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0xa3/0x280 arch/x86/kernel/apic/apic.c:1097 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] sysvec_apic_timer_interrupt+0x80/0xd0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] kcsan_setup_watchpoint+0x44b/0x4a0 kernel/kcsan/core.c:563 wait_task_stopped kernel/exit.c:1148 [inline] wait_consider_task+0x2b1/0x18c0 kernel/exit.c:1352 do_wait_thread kernel/exit.c:1378 [inline] do_wait+0x1b1/0x4d0 kernel/exit.c:1449 kernel_wait4+0x13c/0x1a0 kernel/exit.c:1621 __do_sys_wait4 kernel/exit.c:1649 [inline] __se_sys_wait4 kernel/exit.c:1645 [inline] __x64_sys_wait4+0x7a/0x100 kernel/exit.c:1645 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888121e5fc64 of 1 bytes by task 25077 on cpu 0: queue_access_lock sound/core/seq/seq_queue.c:345 [inline] snd_seq_control_queue+0xf5/0x550 sound/core/seq/seq_queue.c:727 event_input_timer+0x1e/0x30 sound/core/seq/seq_system.c:103 snd_seq_deliver_single_event+0x31b/0x4f0 sound/core/seq/seq_clientmgr.c:638 snd_seq_deliver_event+0x192/0x4a0 sound/core/seq/seq_clientmgr.c:839 snd_seq_dispatch_event+0x14c/0x270 sound/core/seq/seq_clientmgr.c:913 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+0x1df/0x6f0 fs/read_write.c:576 ksys_write+0xce/0x180 fs/read_write.c:631 __do_sys_write fs/read_write.c:643 [inline] __se_sys_write fs/read_write.c:640 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:640 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: 25077 Comm: syz-executor.0 Not tainted 5.9.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================