==================================================================
BUG: KCSAN: data-race in expire_timers / try_to_del_timer_sync

write to 0xffff88812c11cb08 of 8 bytes by interrupt on cpu 1:
 expire_timers+0x11e/0x290 kernel/time/timer.c:1450
 __run_timers+0x443/0x500 kernel/time/timer.c:1773
 run_timer_softirq+0x2e/0x60 kernel/time/timer.c:1786
 __do_softirq+0x198/0x360 kernel/softirq.c:292
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 __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]
 do_softirq_own_stack+0x5d/0x80 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:387 [inline]
 __irq_exit_rcu+0x115/0x120 kernel/softirq.c:417
 sysvec_apic_timer_interrupt+0xba/0xd0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596
 arch_local_irq_restore arch/x86/include/asm/paravirt.h:765 [inline]
 kcsan_setup_watchpoint+0x47c/0x4d0 kernel/kcsan/core.c:542
 common_file_perm security/apparmor/lsm.c:462 [inline]
 apparmor_file_permission+0x30/0x270 security/apparmor/lsm.c:480
 security_file_permission+0x42/0xa0 security/security.c:1431
 rw_verify_area+0x12c/0x240 fs/read_write.c:400
 do_splice_to fs/splice.c:862 [inline]
 splice_direct_to_actor+0x23a/0x660 fs/splice.c:950
 do_splice_direct+0xf2/0x170 fs/splice.c:1059
 do_sendfile+0x562/0xb10 fs/read_write.c:1521
 __do_sys_sendfile64 fs/read_write.c:1576 [inline]
 __se_sys_sendfile64 fs/read_write.c:1568 [inline]
 __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1568
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812c11cb08 of 8 bytes by task 10 on cpu 0:
 try_to_del_timer_sync+0xd3/0x2d0 kernel/time/timer.c:1225
 del_timer_sync kernel/time/timer.c:1365 [inline]
 schedule_timeout+0x1bb/0x2c0 kernel/time/timer.c:1898
 rcu_gp_fqs_loop kernel/rcu/tree.c:1874 [inline]
 rcu_gp_kthread+0x9ad/0x1380 kernel/rcu/tree.c:2044
 kthread+0x20d/0x230 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10 Comm: rcu_preempt Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================