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BUG: KMSAN: uninit-value in lock_timer_base kernel/time/timer.c:939 [inline]
BUG: KMSAN: uninit-value in __mod_timer+0x430/0x2c40 kernel/time/timer.c:1010
CPU: 1 PID: 26095 Comm: syz-executor0 Not tainted 4.17.0-rc5+ #101
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+0x149/0x260 mm/kmsan/kmsan.c:1084
 __msan_warning_32+0x6e/0xc0 mm/kmsan/kmsan_instr.c:686
 lock_timer_base kernel/time/timer.c:939 [inline]
 __mod_timer+0x430/0x2c40 kernel/time/timer.c:1010
 mod_timer+0x70/0x80 kernel/time/timer.c:1102
 can_stat_update+0x173d/0x1870 net/can/proc.c:179
 call_timer_fn+0x26a/0x5a0 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0xda7/0x11c0 kernel/time/timer.c:1666
 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692
 __do_softirq+0x56d/0x93d 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:863
 </IRQ>
RIP: 0010:native_restore_fl arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:78 [inline]
RIP: 0010:kmsan_alloc_page+0x9f/0xe0 mm/kmsan/kmsan.c:886
RSP: 0000:ffff8801c3fcf840 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000246 RBX: ffff8801b8d0d7c0 RCX: 0000000000000001
RDX: 0000000000000001 RSI: ffffea000aa81ca0 RDI: ffffea000aa81ca0
RBP: ffff8801c3fcf880 R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 00000000015080c0 R15: ffffea0009dc1b80
 __alloc_pages_nodemask+0xf8e/0x5dd0 mm/page_alloc.c:4402
 alloc_pages_current+0x6b5/0x970 mm/mempolicy.c:2093
 alloc_pages include/linux/gfp.h:494 [inline]
 pmd_alloc_one arch/x86/include/asm/pgalloc.h:102 [inline]
 __pmd_alloc+0xad/0x410 mm/memory.c:4205
 pmd_alloc include/linux/mm.h:1759 [inline]
 __handle_mm_fault mm/memory.c:4054 [inline]
 handle_mm_fault+0x1416/0x7e50 mm/memory.c:4124
 __do_page_fault+0xec4/0x1a10 arch/x86/mm/fault.c:1400
 do_page_fault+0xd3/0x260 arch/x86/mm/fault.c:1477
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1160
RIP: 0033:0x40d73f
RSP: 002b:0000000000a3e7b0 EFLAGS: 00010206
RAX: 00007f1abf54c000 RBX: 0000000000020000 RCX: 0000000000455a5a
RDX: 0000000000021000 RSI: 0000000000021000 RDI: 0000000000000000
RBP: 0000000000a3e890 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000a3e8a0
R13: 00007f1abf56c700 R14: 000000000072becc R15: 0000000000000000

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:279 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:294 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:685
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:529
 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+0x21a6/0x2c40 kernel/time/timer.c:1055
 mod_timer+0x70/0x80 kernel/time/timer.c:1102
 can_stat_update+0x173d/0x1870 net/can/proc.c:179
 call_timer_fn+0x26a/0x5a0 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0xda7/0x11c0 kernel/time/timer.c:1666
 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692
 __do_softirq+0x56d/0x93d kernel/softirq.c:285
Local variable description: ----timer@schedule_timeout
Variable was created at:
 schedule_timeout+0x67/0x570 kernel/time/timer.c:1763
 rcu_gp_kthread+0x21e1/0x38d0 kernel/rcu/tree.c:2231
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