==================================================================
BUG: KMSAN: uninit-value in __queue_work+0x30a/0x1f20 kernel/workqueue.c:1387
CPU: 1 PID: 10195 Comm: blkid Not tainted 4.17.0-rc3+ #88
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+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
 __queue_work+0x30a/0x1f20 kernel/workqueue.c:1387
 delayed_work_timer_fn+0xa1/0xd0 kernel/workqueue.c:1500
 call_timer_fn+0x26a/0x5a0 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1359 [inline]
 __run_timers+0xdfc/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:__msan_poison_alloca+0x14c/0x1d0 mm/kmsan/kmsan_instr.c:651
RSP: 0018:ffff8801b40ef250 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 00000000b8800070 RBX: 00000000b8800070 RCX: ffff8801b40ef290
RDX: 0000000000000004 RSI: 0000000000000004 RDI: 000000009feb765b
RBP: ffff8801b40ef2f0 R08: 0000000001080020 R09: 0000000000000002
R10: 0000000000000000 R11: ffff8801b40e0000 R12: 0000000000000000
R13: ffffffff8aca7e70 R14: 0000000000000246 R15: ffff88014d9c8000
 uprobe_mmap+0x53/0x1460 kernel/events/uprobes.c:1067
 __vma_adjust+0x2d77/0x41f0 mm/mmap.c:899
 vma_adjust include/linux/mm.h:2164 [inline]
 __split_vma+0x96b/0xcd0 mm/mmap.c:2625
 do_munmap+0x7fd/0x26d0 mm/mmap.c:2705
 vm_munmap+0x16f/0x1e0 mm/mmap.c:2772
 elf_map+0x559/0x710 fs/binfmt_elf.c:376
 load_elf_interp fs/binfmt_elf.c:587 [inline]
 load_elf_binary+0x74b4/0x8f70 fs/binfmt_elf.c:1087
 search_binary_handler+0x2ef/0xac0 fs/exec.c:1653
 exec_binprm fs/exec.c:1695 [inline]
 do_execveat_common+0x22e4/0x2da0 fs/exec.c:1817
 do_execve fs/exec.c:1862 [inline]
 __do_sys_execve fs/exec.c:1943 [inline]
 __se_sys_execve fs/exec.c:1938 [inline]
 __x64_sys_execve+0x127/0x180 fs/exec.c:1938
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fda71d6a207
RSP: 002b:00007ffcc1023338 EFLAGS: 00000202 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007fda71d6a207
RDX: 0000000001c09a20 RSI: 00007ffcc1023430 RDI: 00007ffcc1024440
RBP: 0000000000625500 R08: 0000000000000a18 R09: 0000000000000a18
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000001c09a20
R13: 0000000000000007 R14: 0000000001bf8250 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:528
 __queue_delayed_work+0x3d1/0x450 kernel/workqueue.c:1527
 queue_delayed_work_on+0x1e8/0x210 kernel/workqueue.c:1558
 queue_delayed_work include/linux/workqueue.h:526 [inline]
 schedule_delayed_work include/linux/workqueue.h:627 [inline]
 linkwatch_schedule_work net/core/link_watch.c:140 [inline]
 linkwatch_fire_event+0xa5d/0xbf0 net/core/link_watch.c:251
 netif_carrier_off+0x10b/0x150 net/sched/sch_generic.c:542
 __tun_detach+0x23c3/0x2790 drivers/net/tun.c:733
 tun_detach drivers/net/tun.c:752 [inline]
 tun_chr_close+0xda/0x1c0 drivers/net/tun.c:3251
 __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:810
 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+0x1a6/0x220 arch/x86/entry/common.c:290
 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+0x30f/0x950 mm/mmap.c:3036
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