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BUG: KMSAN: uninit-value in rcu_segcblist_pend_cbs+0xa9/0xf0 kernel/rcu/rcu_segcblist.c:104
CPU: 1 PID: 14721 Comm: udevd Not tainted 4.16.0+ #83
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 rcu_segcblist_pend_cbs+0xa9/0xf0 kernel/rcu/rcu_segcblist.c:104
 rcu_accelerate_cbs+0x7e/0xca0 kernel/rcu/tree.c:1809
 rcu_report_qs_rdp kernel/rcu/tree.c:2513 [inline]
 rcu_check_quiescent_state kernel/rcu/tree.c:2552 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2884 [inline]
 rcu_process_callbacks+0x6fc/0x2070 kernel/rcu/tree.c:2917
 __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:541
 smp_apic_timer_interrupt+0x64/0x90 arch/x86/kernel/apic/apic.c:1055
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:857
 </IRQ>
RIP: 0010:lowmem_page_address include/linux/mm.h:1087 [inline]
RIP: 0010:msan_get_shadow_origin_ptr+0x1ef/0x230 mm/kmsan/kmsan_instr.c:285
RSP: 0018:ffff8801b4f1f200 EFLAGS: 00000a07 ORIG_RAX: ffffffffffffff12
RAX: ffff8801c086f628 RBX: ffffffff8832d000 RCX: ffff880000000000
RDX: 0000000000000628 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000
RBP: ffff8801b4f1f230 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 00000001bf02f000
R13: 000000000a3daba0 R14: ffffffff8832c000 R15: 0000000000000628
 __msan_metadata_ptr_for_store_8+0x13/0x20 mm/kmsan/kmsan_instr.c:321
 __tlb_adjust_range include/asm-generic/tlb.h:127 [inline]
 zap_pte_range mm/memory.c:1323 [inline]
 zap_pmd_range mm/memory.c:1441 [inline]
 zap_pud_range mm/memory.c:1470 [inline]
 zap_p4d_range mm/memory.c:1491 [inline]
 unmap_page_range+0x1a03/0x3be0 mm/memory.c:1512
 unmap_single_vma+0x45b/0x5f0 mm/memory.c:1557
 unmap_vmas+0x1f4/0x360 mm/memory.c:1587
 exit_mmap+0x3da/0x950 mm/mmap.c:3020
 __mmput+0x16c/0x610 kernel/fork.c:961
 mmput+0xab/0xf0 kernel/fork.c:982
 exec_mmap fs/exec.c:1039 [inline]
 flush_old_exec+0x1adb/0x2170 fs/exec.c:1271
 load_elf_binary+0x134d/0x8f90 fs/binfmt_elf.c:864
 search_binary_handler+0x2ef/0xac0 fs/exec.c:1638
 exec_binprm fs/exec.c:1680 [inline]
 do_execveat_common+0x1f4d/0x2ce0 fs/exec.c:1802
 do_execve fs/exec.c:1847 [inline]
 SYSC_execve+0xe2/0x110 fs/exec.c:1928
 SyS_execve+0x56/0x80 fs/exec.c:1923
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x7f926a441207
RSP: 002b:00007fffa351eb48 EFLAGS: 00000206 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f926a441207
RDX: 00000000015734b0 RSI: 00007fffa351ec40 RDI: 00007fffa351fc50
RBP: 0000000000625500 R08: 0000000000000e7e R09: 0000000000000e7e
R10: 0000000000000000 R11: 0000000000000206 R12: 00000000015734b0
R13: 0000000000000007 R14: 000000000156c250 R15: 0000000000000005

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:521
 rcu_segcblist_enqueue+0x275/0x2d0 kernel/rcu/rcu_segcblist.c:151
 __call_rcu+0x227/0xef0 kernel/rcu/tree.c:3060
 call_rcu_sched+0x32/0x40 kernel/rcu/tree.c:3100
 release_task+0x24b9/0x2530 kernel/exit.c:223
 exit_notify kernel/exit.c:736 [inline]
 do_exit+0x2d91/0x38d0 kernel/exit.c:887
 do_group_exit+0x1a0/0x360 kernel/exit.c:970
 get_signal+0x1320/0x1f20 kernel/signal.c:2469
 do_signal+0xb8/0x1c80 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline]
 prepare_exit_to_usermode+0x271/0x3a0 arch/x86/entry/common.c:196
 syscall_return_slowpath+0xe9/0x700 arch/x86/entry/common.c:265
 do_syscall_64+0x36d/0x430 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Local variable description: ----ac@__alloc_pages_nodemask
Variable was created at:
 __alloc_pages_nodemask+0x196/0x5dc0 mm/page_alloc.c:4236
 alloc_pages_current+0x6b5/0x970 mm/mempolicy.c:2055
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