==================================================================
BUG: KMSAN: uninit-value in flush_tlb_func_remote+0xce/0xf0 arch/x86/mm/tlb.c:553
CPU: 0 PID: 9 Comm: rcu_sched Not tainted 4.17.0+ #5
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:1117
 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:620
 flush_tlb_func_remote+0xce/0xf0 arch/x86/mm/tlb.c:553
 flush_smp_call_function_queue+0x321/0x610 kernel/smp.c:243
 generic_smp_call_function_single_interrupt+0x1f/0x30 kernel/smp.c:192
 smp_call_function_single_interrupt+0x234/0x3d0 arch/x86/kernel/smp.c:295
 call_function_single_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:885
 </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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x5a/0x80 kernel/locking/spinlock.c:184
RSP: 0018:ffff8801d8dcfb88 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff04
RAX: ffff88021f0c6480 RBX: ffff88021fc34480 RCX: ffff880000000000
RDX: ffff88021f0c7480 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000
RBP: ffff8801d8dcfbc0 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88021f0c6480 R14: 0000000000000000 R15: 0000000000000282
 __mod_timer+0x26b1/0x2bf0 kernel/time/timer.c:1059
 schedule_timeout+0x3ea/0x580 kernel/time/timer.c:1800
 rcu_gp_kthread+0x21e1/0x38d0 kernel/rcu/tree.c:2231
 kthread+0x4db/0x6c0 kernel/kthread.c:241
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:412

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:464
 generic_exec_single+0x4a5/0x4f0 kernel/smp.c:165
 smp_call_function_single+0x28c/0x4e0 kernel/smp.c:299
 smp_call_function_many+0x662/0xdf0 kernel/smp.c:434
 native_flush_tlb_others+0x4e8/0x500 arch/x86/mm/tlb.c:595
 flush_tlb_mm_range+0x32f/0x450 arch/x86/mm/tlb.c:644
 tlb_flush_mmu_tlbonly+0x1ce/0x5f0 mm/memory.c:247
 tlb_flush_mmu mm/memory.c:268 [inline]
 arch_tlb_finish_mmu mm/memory.c:284 [inline]
 tlb_finish_mmu+0x202/0x5c0 mm/memory.c:434
 free_ldt_pgtables arch/x86/kernel/ldt.c:216 [inline]
 ldt_arch_exit_mmap+0x130/0x160 arch/x86/kernel/ldt.c:304
 arch_exit_mmap arch/x86/include/asm/mmu_context.h:245 [inline]
 exit_mmap+0x410/0x980 mm/mmap.c:3094
 __mmput+0x158/0x600 kernel/fork.c:962
 mmput+0xab/0xf0 kernel/fork.c:983
 exit_mm+0x6ed/0x7a0 kernel/exit.c:545
 do_exit+0xc12/0x3930 kernel/exit.c:854
 do_group_exit+0x1a0/0x360 kernel/exit.c:970
 __do_sys_exit_group+0x21/0x30 kernel/exit.c:981
 __se_sys_exit_group+0x14/0x20 kernel/exit.c:979
 __x64_sys_exit_group+0x4c/0x50 kernel/exit.c:979
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
Local variable description: ----tlb.i@ldt_arch_exit_mmap
Variable was created at:
 ldt_arch_exit_mmap+0x46/0x160 arch/x86/kernel/ldt.c:302
 arch_exit_mmap arch/x86/include/asm/mmu_context.h:245 [inline]
 exit_mmap+0x410/0x980 mm/mmap.c:3094
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