==================================================================
BUG: KASAN: stack-out-of-bounds in timerqueue_add+0x242/0x2b0 lib/timerqueue.c:49
Read of size 8 at addr ffff8881901bf728 by task syz-executor1/11538

CPU: 1 PID: 11538 Comm: syz-executor1 Not tainted 4.20.0-rc6+ #347
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x244/0x39d lib/dump_stack.c:113
PANIC: double fault, error_code: 0x0
CPU: 0 PID: 11543 Comm: syz-executor3 Not tainted 4.20.0-rc6+ #347
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
RIP: 0010:write_comp_data+0x0/0x70 kernel/kcov.c:116
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412
Code: e8 15 be 43 00 e9 a6 fc ff ff 4c 89 f7 e8 68 bd 43 00 e9 6f fc ff ff e8 ae 64 c9 ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 48 89 e5 65 4c 8b 04 25 40 ee 01 00 65 8b 05 9c 69 82 7e a9 00
RSP: 0018:ffff88818dabd000 EFLAGS: 00010246
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
RAX: 0000000000000000 RBX: ffff888197a8c580 RCX: ffffffff86b1828b
 timerqueue_add+0x242/0x2b0 lib/timerqueue.c:49
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
 enqueue_hrtimer+0x1a5/0x560 kernel/time/hrtimer.c:960
RBP: ffff88818dabd008 R08: ffff8881c1050380 R09: 000000000000000b
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881bc26cc2a
R13: ffff888195aaaa40 R14: ffff8881bc26cc2a R15: 0000000000000005
FS:  00007fb159f17700(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 __hrtimer_start_range_ns kernel/time/hrtimer.c:1089 [inline]
 hrtimer_start_range_ns+0x640/0xe00 kernel/time/hrtimer.c:1115
CR2: ffff88818dabcff8 CR3: 00000001cc285000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace: