==================================================================
BUG: KMSAN: uninit-value in rcu_cblist_dequeue+0x1bb/0x290 kernel/rcu/rcu_segcblist.c:54
CPU: 0 PID: 15714 Comm: blkid Not tainted 4.16.0+ #82
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_cblist_dequeue+0x1bb/0x290 kernel/rcu/rcu_segcblist.c:54
 rcu_do_batch kernel/rcu/tree.c:2671 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2933 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2900 [inline]
 rcu_process_callbacks+0x15cd/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: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:869
RSP: 0000:ffff8801a582f878 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff12
RAX: 0000000000000246 RBX: ffff8801cf451d80 RCX: 0000000000000001
RDX: 0000000000000001 RSI: ffffea000b006640 RDI: ffffea000b006640
RBP: ffff8801a582f8b8 R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 00000000014280ca R15: ffffea000ab137a0
 __alloc_pages_nodemask+0xf5b/0x5dc0 mm/page_alloc.c:4283
 alloc_pages_vma+0xcc8/0x1800 mm/mempolicy.c:2019
 alloc_zeroed_user_highpage_movable include/linux/highmem.h:184 [inline]
 do_anonymous_page mm/memory.c:3171 [inline]
 handle_pte_fault mm/memory.c:3977 [inline]
 __handle_mm_fault mm/memory.c:4103 [inline]
 handle_mm_fault+0x3eb7/0x7ba0 mm/memory.c:4140
 __do_page_fault+0xec4/0x1a10 arch/x86/mm/fault.c:1423
 do_page_fault+0xd3/0x260 arch/x86/mm/fault.c:1500
 page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1151
RIP: 0033:0x7f7cbc9c9b84
RSP: 002b:00007ffd6e258410 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00007f7cbcd1a4c8 RCX: 00007f7cbcd1a4c8
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007f7cbcd1a4c8
RBP: 0000000000000000 R08: 0000000000405550 R09: 00007f7cbcf552e0
R10: 0000000000000000 R11: 00007f7cbc9b1db0 R12: 0000000000000000
R13: 00007ffd6e258510 R14: 0000000000000000 R15: 0000000000000000

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_extract_done_cbs+0x3f7/0x5e0 kernel/rcu/rcu_segcblist.c:215
 rcu_do_batch kernel/rcu/tree.c:2667 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2933 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2900 [inline]
 rcu_process_callbacks+0x159b/0x2070 kernel/rcu/tree.c:2917
 __do_softirq+0x56d/0x93d kernel/softirq.c:285
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+0x24c/0x2d0 kernel/rcu/rcu_segcblist.c:150
 __call_rcu+0x227/0xef0 kernel/rcu/tree.c:3060
 call_rcu_sched+0x32/0x40 kernel/rcu/tree.c:3100
 netlink_release+0x1e71/0x20f0 net/netlink/af_netlink.c:813
 sock_release net/socket.c:595 [inline]
 sock_close+0xe0/0x300 net/socket.c:1149
 __fput+0x49e/0xa10 fs/file_table.c:209
 ____fput+0x37/0x40 fs/file_table.c:243
 task_work_run+0x243/0x2c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x10e1/0x38d0 kernel/exit.c:867
 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: ----flags.i.i.i.i@_raw_spin_lock_irqsave
Variable was created at:
 _raw_spin_lock_irqsave+0x45/0xf0 kernel/locking/spinlock.c:150
 __wake_up_common_lock+0x10c/0x370 kernel/sched/wait.c:124
==================================================================