l2tp_core: tunl 2: sockfd_lookup(fd=22) returned -88
==================================================================
BUG: KASAN: alloca-out-of-bounds in tick_sched_handle+0x16d/0x180 kernel/time/tick-sched.c:171
Read of size 8 at addr ffff88018837e660 by task syz-executor7/7399

CPU: 1 PID: 7399 Comm: syz-executor7 Not tainted 4.16.0+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b9/0x29f lib/dump_stack.c:53
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0xac/0x2f5 mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 tick_sched_handle+0x16d/0x180 kernel/time/tick-sched.c:171
 tick_sched_timer+0x42/0x130 kernel/time/tick-sched.c:1179
 __run_hrtimer kernel/time/hrtimer.c:1337 [inline]
 __hrtimer_run_queues+0x3e3/0x10a0 kernel/time/hrtimer.c:1399
 hrtimer_interrupt+0x286/0x650 kernel/time/hrtimer.c:1457
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0x15d/0x710 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:862
 </IRQ>
RIP: 0010:__asan_allocas_unpoison+0xb/0x20 mm/kasan/kasan.c:770
RSP: 0018:ffff88018837e680 EFLAGS: 00000287 ORIG_RAX: ffffffffffffff13
RAX: ffff8801b67c8100 RBX: 0000000000000000 RCX: ffffffff859d4219
RDX: 0000000000000000 RSI: ffff88018837e690 RDI: ffff88018837e5e0
RBP: ffff88018837e978 R08: ffff8801b67c8100 R09: ffffed003b6246c2
R10: ffffed003b6246c2 R11: ffff8801db123613 R12: 0000000000000015
R13: 0000000000000001 R14: 0000000000000000 R15: dffffc0000000000
 snd_pcm_hw_refine+0x8e9/0x1180 sound/core/pcm_native.c:502
 snd_pcm_hw_param_first+0x30e/0x680 sound/core/pcm_lib.c:1633
 snd_pcm_hw_param_near.constprop.33+0x6e2/0xb10 sound/core/oss/pcm_oss.c:457
 snd_pcm_oss_change_params+0x1de9/0x3d10 sound/core/oss/pcm_oss.c:968
 snd_pcm_oss_make_ready+0xe3/0x140 sound/core/oss/pcm_oss.c:1127
 snd_pcm_oss_sync.isra.27+0x352/0x850 sound/core/oss/pcm_oss.c:1591
 snd_pcm_oss_release+0x214/0x290 sound/core/oss/pcm_oss.c:2446
 __fput+0x34d/0x890 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1e4/0x290 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1aee/0x2730 kernel/exit.c:865
 do_group_exit+0x16f/0x430 kernel/exit.c:968
 get_signal+0x886/0x1960 kernel/signal.c:2469
 do_signal+0x90/0x2020 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_64+0x792/0x9d0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4552d9
RSP: 002b:00007fbef1334c68 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
RAX: fffffffffffffdfe RBX: 00007fbef13356d4 RCX: 00000000004552d9
RDX: 0000000020003000 RSI: 0000000000000001 RDI: 0000000020015fb8
RBP: 000000000072bf58 R08: 0000000000000008 R09: 0000000000000000
R10: 0000000020015000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000462 R14: 00000000006f99d0 R15: 0000000000000001

The buggy address belongs to the page:
page:ffffea000620df80 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: dead000000000100 dead000000000200 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88018837e500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88018837e580: 00 00 00 00 00 00 00 00 00 00 00 00 ca ca ca ca
>ffff88018837e600: 00 00 00 00 00 00 00 00 00 00 04 cb cb cb cb cb
                                                       ^
 ffff88018837e680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88018837e700: 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 f2 f2
==================================================================