================================================================== BUG: KCSAN: data-race in snd_seq_prioq_cell_out / snd_seq_timer_interrupt write to 0xffff88809b92e618 of 4 bytes by interrupt on cpu 0: snd_seq_timer_update_tick sound/core/seq/seq_timer.h:58 [inline] snd_seq_timer_interrupt+0x202/0x280 sound/core/seq/seq_timer.c:150 snd_timer_process_callbacks+0x1e4/0x220 sound/core/timer.c:796 snd_timer_interrupt sound/core/timer.c:919 [inline] snd_timer_interrupt+0x483/0x930 sound/core/timer.c:840 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:1119 [inline] smp_apic_timer_interrupt+0xdc/0x280 arch/x86/kernel/apic/apic.c:1144 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 find_watchpoint kernel/kcsan/core.c:124 [inline] check_access kernel/kcsan/core.c:551 [inline] __tsan_read4+0x61/0x100 kernel/kcsan/core.c:699 skb_put+0xc6/0x110 net/core/skbuff.c:1866 skb_put_zero include/linux/skbuff.h:2242 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:350 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:376 [inline] nsim_dev_trap_report_work+0x427/0x5a0 drivers/net/netdevsim/dev.c:415 process_one_work+0x413/0x8f0 kernel/workqueue.c:2264 worker_thread+0xa0/0x800 kernel/workqueue.c:2410 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 read to 0xffff88809b92e618 of 4 bytes by task 30892 on cpu 1: event_is_ready sound/core/seq/seq_prioq.c:205 [inline] snd_seq_prioq_cell_out+0x83/0x210 sound/core/seq/seq_prioq.c:225 snd_seq_check_queue+0xce/0x200 sound/core/seq/seq_queue.c:258 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: 30892 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 ==================================================================