==================================================================
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: 0 PID: 13939 Comm: blkid 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
 garp_join_timer_arm net/802/garp.c:401 [inline]
 garp_join_timer+0x375/0x390 net/802/garp.c:414
 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: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:__msan_poison_alloca+0x14c/0x1d0 mm/kmsan/kmsan_instr.c:587
RSP: 0018:ffff8801b838f700 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 00000000d7c0006e RBX: 00000000d7c0006e RCX: ffff8801b838f740
RDX: 0000000000000004 RSI: 0000000000000004 RDI: 00000000825f9675
RBP: ffff8801b838f7a0 R08: 0000000001080020 R09: 0000000000000002
R10: 00007f45a4d49000 R11: ffffffff81aeef90 R12: 0000000000000000
R13: ffffffff8aca8d30 R14: 0000000000000246 R15: ffff88014ad057c0
 uprobe_mmap+0x60/0x1470 kernel/events/uprobes.c:1066
 __vma_adjust+0x2e86/0x4140 mm/mmap.c:899
 vma_adjust include/linux/mm.h:2163 [inline]
 __split_vma+0x98c/0xcb0 mm/mmap.c:2657
 split_vma+0x10f/0x170 mm/mmap.c:2686
 mprotect_fixup+0x94c/0xf50 mm/mprotect.c:362
 do_mprotect_pkey+0xba8/0x11d0 mm/mprotect.c:506
 __do_sys_mprotect mm/mprotect.c:531 [inline]
 __se_sys_mprotect mm/mprotect.c:528 [inline]
 __x64_sys_mprotect+0xe3/0x130 mm/mprotect.c:528
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f45a4d5f447
RSP: 002b:00007ffdc8bad0e8 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007f45a4f674c8 RCX: 00007f45a4d5f447
RDX: 0000000000000000 RSI: 0000000000200000 RDI: 00007f45a4b45000
RBP: 00007ffdc8bad3b0 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000206 R12: 00007ffdc8bad498
R13: 0000000000000002 R14: 0000000000000030 R15: 00007ffdc8bad130

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
 garp_join_timer_arm net/802/garp.c:401 [inline]
 garp_join_timer+0x375/0x390 net/802/garp.c:414
 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: ----t.i.i@__se_sys_nanosleep
Variable was created at:
 __se_sys_nanosleep+0x5f/0x6a0 kernel/time/hrtimer.c:1762
 __x64_sys_nanosleep+0x92/0xc0 kernel/time/hrtimer.c:1762
==================================================================