==================================================================
BUG: KMSAN: uninit-value in lock_timer_base kernel/time/timer.c:939 [inline]
BUG: KMSAN: uninit-value in __mod_timer+0x42d/0x2bf0 kernel/time/timer.c:1010
CPU: 1 PID: 18870 Comm: syz-executor5 Not tainted 4.17.0+ #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:1125
 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:620
 lock_timer_base kernel/time/timer.c:939 [inline]
 __mod_timer+0x42d/0x2bf0 kernel/time/timer.c:1010
 mod_timer+0x70/0x80 kernel/time/timer.c:1102
 can_stat_update+0x15ec/0x1860 net/can/proc.c:179
 call_timer_fn+0x280/0x5d0 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0xd96/0x11b0 kernel/time/timer.c:1666
 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692
 __do_softirq+0x592/0x979 kernel/softirq.c:285
 invoke_softirq kernel/softirq.c:365 [inline]
 irq_exit+0x202/0x240 kernel/softirq.c:405
 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:525
 smp_apic_timer_interrupt+0x64/0x90 arch/x86/kernel/apic/apic.c:1055
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:866
 </IRQ>
RIP: 0010:clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:47
RSP: 0018:ffff88012b39faa0 EFLAGS: 00010246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffff88012a13e000 RCX: 0000000000000740
RDX: ffff8801b96a3618 RSI: aaaaaaaaaaaab000 RDI: ffff88012a13e8c0
RBP: ffff88012b39fb48 R08: 0000000001080020 R09: 0000000000000002
R10: ffffffff7fffffff R11: ffffffff813553c0 R12: ffff8801b9c1b618
R13: ffffea0006fc7740 R14: ffff88012b39faa8 R15: 0000000000000000
 __do_huge_pmd_anonymous_page mm/huge_memory.c:570 [inline]
 do_huge_pmd_anonymous_page+0xf86/0x2540 mm/huge_memory.c:728
 create_huge_pmd mm/memory.c:3856 [inline]
 __handle_mm_fault mm/memory.c:4060 [inline]
 handle_mm_fault+0x44ca/0x7ed0 mm/memory.c:4126
 __do_page_fault+0xec6/0x1a10 arch/x86/mm/fault.c:1400
 do_page_fault+0xb7/0x250 arch/x86/mm/fault.c:1477
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1163
RIP: 0033:0x43cf61
RSP: 002b:0000000000a3e978 EFLAGS: 00010247
RAX: 000000006578652f RBX: 0000000000000000 RCX: 0000000000000000
RDX: 000000000000003c RSI: 0000000000730020 RDI: 0000000020000080
RBP: 0000000000000000 R08: ded9dd4b00090400 R09: e90e00bfee10be91
R10: d59e435880790fa9 R11: 0000000000000246 R12: 000000000008147a
R13: 0000000000000002 R14: 0000000000a3f160 R15: 0000000000000001

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:282 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:297 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:689
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:464
 timer_set_idx kernel/time/timer.c:480 [inline]
 enqueue_timer kernel/time/timer.c:539 [inline]
 __internal_add_timer kernel/time/timer.c:548 [inline]
 internal_add_timer kernel/time/timer.c:590 [inline]
 __mod_timer+0x22a1/0x2bf0 kernel/time/timer.c:1055
 mod_timer+0x70/0x80 kernel/time/timer.c:1102
 can_stat_update+0x15ec/0x1860 net/can/proc.c:179
 call_timer_fn+0x280/0x5d0 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0xd96/0x11b0 kernel/time/timer.c:1666
 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692
 __do_softirq+0x592/0x979 kernel/softirq.c:285

Local variable description: ----heads@__run_timers
Variable was created at:
 __run_timers+0x84/0x11b0 kernel/time/timer.c:1651
 run_timer_softirq+0x5f/0x70 kernel/time/timer.c:1694
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