==================================================================
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: 1 PID: 7881 Comm: blkid Not tainted 4.17.0+ #7
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:1121
 __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
 blk_stat_activate_nsecs block/blk-stat.h:188 [inline]
 rwb_arm_timer block/blk-wbt.c:401 [inline]
 wb_timer_fn+0x456d/0x4dd0 block/blk-wbt.c:456
 blk_stat_timer_fn+0xbbf/0xbe0 block/blk-stat.c:101
 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:863
 </IRQ>
RIP: 0010:vma_pages include/linux/mm.h:2381 [inline]
RIP: 0010:vma_last_pgoff mm/interval_tree.c:21 [inline]
RIP: 0010:vma_interval_tree_compute_subtree_last mm/interval_tree.c:24 [inline]
RIP: 0010:vma_interval_tree_augment_propagate mm/interval_tree.c:24 [inline]
RIP: 0010:__rb_erase_augmented include/linux/rbtree_augmented.h:267 [inline]
RIP: 0010:rb_erase_augmented_cached include/linux/rbtree_augmented.h:285 [inline]
RIP: 0010:vma_interval_tree_remove+0x1439/0x1a50 mm/interval_tree.c:24
RSP: 0018:ffff8801c64df4c8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff880000000000
RDX: ffff8801975459f8 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000
RBP: ffff8801c64df5b0 R08: 0000000000000000 R09: ffff88010282c830
R10: 00007effd0a2b000 R11: ffff88010282bc80 R12: 0000000000000000
R13: ffff880197543960 R14: 00007f4c0a0ab000 R15: ffff880197543968
 __vma_adjust+0x11d9/0x4140 mm/mmap.c:825
 vma_adjust include/linux/mm.h:2163 [inline]
 __split_vma+0x98c/0xcb0 mm/mmap.c:2657
 do_munmap+0x9ce/0x26c0 mm/mmap.c:2746
 mmap_region+0x1500/0x3730 mm/mmap.c:1705
 do_mmap+0x1902/0x2010 mm/mmap.c:1535
 do_mmap_pgoff include/linux/mm.h:2236 [inline]
 vm_mmap_pgoff+0x31b/0x430 mm/util.c:357
 ksys_mmap_pgoff+0xa5a/0xaf0 mm/mmap.c:1585
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
 __x64_sys_mmap+0x1f1/0x260 arch/x86/kernel/sys_x86_64.c:91
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7effd0c683ea
RSP: 002b:00007ffe0810b3b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007effd0e709a8 RCX: 00007effd0c683ea
RDX: 0000000000000003 RSI: 0000000000005000 RDI: 00007effd0a21000
RBP: 00007ffe0810b710 R08: 0000000000000003 R09: 0000000000183000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffe0810b7f8
R13: 0000000000000002 R14: 00007ffe0810b430 R15: 00007ffe0810b400

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
 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
 blk_stat_activate_nsecs block/blk-stat.h:188 [inline]
 rwb_arm_timer block/blk-wbt.c:401 [inline]
 wb_timer_fn+0x456d/0x4dd0 block/blk-wbt.c:456
 blk_stat_timer_fn+0xbbf/0xbe0 block/blk-stat.c:101
 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
==================================================================