================================================================== BUG: KCSAN: data-race in snd_seq_check_queue / snd_seq_control_queue write to 0xffff88808a35a4e4 of 1 bytes by interrupt on cpu 0: queue_access_lock sound/core/seq/seq_queue.c:359 [inline] snd_seq_control_queue+0x17b/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_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] do_softirq+0x95/0xb0 kernel/softirq.c:345 __local_bh_enable_ip+0x63/0x70 kernel/softirq.c:195 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_bh+0x33/0x40 kernel/locking/spinlock.c:207 spin_unlock_bh include/linux/spinlock.h:399 [inline] batadv_purge_orig_ref+0x182f/0x18a0 net/batman-adv/originator.c:1366 batadv_purge_orig+0x15/0x40 net/batman-adv/originator.c:1379 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 0xffff88808a35a4e4 of 1 bytes by task 8107 on cpu 1: snd_seq_check_queue+0x51/0x290 sound/core/seq/seq_queue.c:249 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: 1 PID: 8107 Comm: syz-executor.1 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================