================================================================== BUG: KCSAN: data-race in snd_seq_check_queue / snd_seq_control_queue read to 0xffff8880a690ad24 of 1 bytes by interrupt on cpu 0: snd_seq_check_queue+0x59/0x200 sound/core/seq/seq_queue.c:247 snd_seq_timer_interrupt+0x243/0x280 sound/core/seq/seq_timer.c:158 snd_timer_process_callbacks+0x1e4/0x220 sound/core/timer.c:750 snd_timer_interrupt sound/core/timer.c:873 [inline] snd_timer_interrupt+0x483/0x930 sound/core/timer.c:794 snd_hrtimer_callback+0x18f/0x260 sound/core/hrtimer.c:50 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x274/0x5f0 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x22a/0x480 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0xdc/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 __read_once_size include/linux/compiler.h:232 [inline] check_kcov_mode kernel/kcov.c:155 [inline] write_comp_data+0x1e/0x70 kernel/kcov.c:208 check_prefetch_opcode arch/x86/mm/fault.c:71 [inline] is_prefetch.isra.0+0x131/0x310 arch/x86/mm/fault.c:139 __bad_area_nosemaphore+0xc3/0x310 arch/x86/mm/fault.c:882 __bad_area arch/x86/mm/fault.c:933 [inline] bad_area+0x47/0x50 arch/x86/mm/fault.c:939 do_user_addr_fault arch/x86/mm/fault.c:1404 [inline] __do_page_fault+0x6a3/0x8d0 arch/x86/mm/fault.c:1506 do_page_fault+0x38/0x194 arch/x86/mm/fault.c:1530 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203 write to 0xffff8880a690ad24 of 1 bytes by task 29739 on cpu 1: queue_access_unlock sound/core/seq/seq_queue.c:367 [inline] snd_seq_control_queue+0x167/0x350 sound/core/seq/seq_queue.c:726 event_input_timer+0x2f/0x50 sound/core/seq/seq_system.c:103 snd_seq_deliver_single_event.constprop.0+0x3e8/0x4d0 sound/core/seq/seq_clientmgr.c:638 snd_seq_deliver_event+0x2e9/0x4c0 sound/core/seq/seq_clientmgr.c:839 snd_seq_dispatch_event+0xa1/0x340 sound/core/seq/seq_clientmgr.c:913 snd_seq_check_queue+0xeb/0x200 sound/core/seq/seq_queue.c:262 snd_seq_enqueue_event+0x163/0x2b0 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+0x23f/0x4d0 sound/core/seq/seq_clientmgr.c:1093 __vfs_write+0x67/0xc0 fs/read_write.c:494 vfs_write fs/read_write.c:558 [inline] vfs_write+0x18a/0x390 fs/read_write.c:542 ksys_write+0x17b/0x1b0 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+0x4c/0x60 fs/read_write.c:620 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 29739 Comm: syz-executor.1 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================