syzbot

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BUG: KMSAN: uninit-value in hrtimer_active+0x22d/0x330 kernel/time/hrtimer.c:1329
CPU: 1 PID: 11602 Comm: syz-executor7 Not tainted 4.17.0-rc5+ #103
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+0x149/0x260 mm/kmsan/kmsan.c:1084
 __msan_warning_32+0x6e/0xc0 mm/kmsan/kmsan_instr.c:686
 hrtimer_active+0x22d/0x330 kernel/time/hrtimer.c:1329
 entity_tick kernel/sched/fair.c:4479 [inline]
 task_tick_fair+0x6c7/0x1050 kernel/sched/fair.c:9893
 scheduler_tick+0x288/0x480 kernel/sched/core.c:3088
 update_process_times+0x157/0x1a0 kernel/time/timer.c:1641
 tick_sched_handle kernel/time/tick-sched.c:164 [inline]
 tick_sched_timer+0x3ba/0x520 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0xc03/0x15d0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x451/0x13c0 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt+0x66/0x230 arch/x86/kernel/apic/apic.c:1025
 smp_apic_timer_interrupt+0x5a/0x90 arch/x86/kernel/apic/apic.c:1053
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863
 </IRQ>
RIP: 0010:finish_lock_switch+0x38/0x50 kernel/sched/core.c:2609
RSP: 0018:ffff8801b3ccfc20 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff88021f2dac40 RBX: 0000000000000001 RCX: ffff880000000000
RDX: ffff88021f2dbc40 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000
RBP: ffff8801b3ccfc38 R08: 0000000001080020 R09: 0000000000000002
R10: ffffffff7fffffff R11: 0000000000000000 R12: ffff88021fd3ec40
R13: ffff88012fd4c358 R14: 0000000000000000 R15: ffff88021f2dac40
 finish_task_switch+0xde/0x270 kernel/sched/core.c:2708
 context_switch kernel/sched/core.c:2866 [inline]
 __schedule+0x688/0x730 kernel/sched/core.c:3507
 schedule+0x1cc/0x2f0 kernel/sched/core.c:3551
 freezable_schedule include/linux/freezer.h:172 [inline]
 do_nanosleep+0x2c3/0x9b0 kernel/time/hrtimer.c:1689
 hrtimer_nanosleep kernel/time/hrtimer.c:1743 [inline]
 __do_sys_nanosleep kernel/time/hrtimer.c:1775 [inline]
 __se_sys_nanosleep+0x4b3/0x6a0 kernel/time/hrtimer.c:1762
 __x64_sys_nanosleep+0x92/0xc0 kernel/time/hrtimer.c:1762
 do_syscall_64+0x152/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x481131
RSP: 002b:0000000000a3e950 EFLAGS: 00000293 ORIG_RAX: 0000000000000023
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000481131
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000a3e960
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000a3e940 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000002 R14: 000000000072bea0 R15: 0000000000030639

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:529
 __run_hrtimer kernel/time/hrtimer.c:1369 [inline]
 __hrtimer_run_queues+0x786/0x15d0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x451/0x13c0 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt+0x66/0x230 arch/x86/kernel/apic/apic.c:1025
 smp_apic_timer_interrupt+0x5a/0x90 arch/x86/kernel/apic/apic.c:1053
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:529
 timerqueue_add+0x472/0x4f0 lib/timerqueue.c:61
 enqueue_hrtimer kernel/time/hrtimer.c:960 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1413 [inline]
 __hrtimer_run_queues+0x1228/0x15d0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x451/0x13c0 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt+0x66/0x230 arch/x86/kernel/apic/apic.c:1025
 smp_apic_timer_interrupt+0x5a/0x90 arch/x86/kernel/apic/apic.c:1053
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
 hrtimer_interrupt+0x107/0x13c0 kernel/time/hrtimer.c:1499
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