watchdog: BUG: soft lockup - CPU#3 stuck for 210s! [syzkaller355698:2995] Modules linked in: irq event stamp: 23090 hardirqs last enabled at (23089): [] __raw_spin_lock_init+0x1c/0x100 kernel/locking/spinlock_debug.c:23 hardirqs last disabled at (23090): [] apic_timer_interrupt+0x98/0xb0 arch/x86/entry/entry_64.S:577 softirqs last enabled at (1838): [] __do_softirq+0x74d/0xbd0 kernel/softirq.c:310 softirqs last disabled at (1825): [] invoke_softirq kernel/softirq.c:364 [inline] softirqs last disabled at (1825): [] irq_exit+0x1d3/0x210 kernel/softirq.c:405 CPU: 3 PID: 2995 Comm: syzkaller355698 Not tainted 4.13.0-rc7-next-20170901+ #13 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff88006b8fc580 task.stack: ffff880069df8000 RIP: 0010:clear_page_rep+0x7/0x10 arch/x86/lib/clear_page_64.S:19 RSP: 0000:ffff880069dff6f8 EFLAGS: 00010246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: 0000000000000057 RCX: 0000000000000178 RDX: 0000000000000000 RSI: ffff88006b8fc580 RDI: ffff880064657440 RBP: ffff880069dff760 R08: 0000000000029190 R09: 0000000000000000 R10: ffffffffffffffe8 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88006b8fc580 R14: ffff88006b8fc580 R15: ffff88006b8fc580 FS: 0000000000f65880(0000) GS:ffff88006df00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020c67ff1 CR3: 000000006741d000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __do_huge_pmd_anonymous_page mm/huge_memory.c:570 [inline] do_huge_pmd_anonymous_page+0x59c/0x1ba0 mm/huge_memory.c:728 create_huge_pmd mm/memory.c:3802 [inline] __handle_mm_fault+0x1827/0x39c0 mm/memory.c:4005 handle_mm_fault+0x3bb/0x860 mm/memory.c:4071 __do_page_fault+0x4f6/0xb60 arch/x86/mm/fault.c:1445 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1520 do_async_page_fault+0x72/0xc0 arch/x86/kernel/kvm.c:266 async_page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1069 RIP: 0033:0x4012c8 RSP: 002b:00007ffc12d93e10 EFLAGS: 00010286 RAX: ffffffffffffffff RBX: ffffffffffffffff RCX: 0000000000439779 RDX: 0000000000000000 RSI: 000000002076e000 RDI: ffffffffffffffff RBP: 00327265636e6575 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000286 R12: 7165732f7665642f R13: 646e732f7665642f R14: 0030656c69662f2e R15: 0000000000000000 Code: 60 39 d1 fc e9 8d fd ff ff be 08 00 00 00 4c 89 ff e8 2e 39 d1 fc e9 1c fd ff ff 90 90 90 90 90 90 90 90 90 b9 00 02 00 00 31 c0 48 ab c3 0f 1f 44 00 00 31 c0 b9 40 00 00 00 66 0f 1f 84 00 Kernel panic - not syncing: softlockup: hung tasks CPU: 3 PID: 2995 Comm: syzkaller355698 Tainted: G L 4.13.0-rc7-next-20170901+ #13 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 panic+0x1e4/0x417 kernel/panic.c:181 watchdog_timer_fn+0x401/0x410 kernel/watchdog.c:433 __run_hrtimer kernel/time/hrtimer.c:1213 [inline] __hrtimer_run_queues+0x349/0xe10 kernel/time/hrtimer.c:1277 hrtimer_interrupt+0x1d4/0x5f0 kernel/time/hrtimer.c:1311 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1021 [inline] smp_apic_timer_interrupt+0x156/0x710 arch/x86/kernel/apic/apic.c:1046 apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:577 RIP: 0010:clear_page_rep+0x7/0x10 arch/x86/lib/clear_page_64.S:19 RSP: 0000:ffff880069dff6f8 EFLAGS: 00010246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: 0000000000000057 RCX: 0000000000000178 RDX: 0000000000000000 RSI: ffff88006b8fc580 RDI: ffff880064657440 RBP: ffff880069dff760 R08: 0000000000029190 R09: 0000000000000000 R10: ffffffffffffffe8 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88006b8fc580 R14: ffff88006b8fc580 R15: ffff88006b8fc580 __do_huge_pmd_anonymous_page mm/huge_memory.c:570 [inline] do_huge_pmd_anonymous_page+0x59c/0x1ba0 mm/huge_memory.c:728 create_huge_pmd mm/memory.c:3802 [inline] __handle_mm_fault+0x1827/0x39c0 mm/memory.c:4005 handle_mm_fault+0x3bb/0x860 mm/memory.c:4071 __do_page_fault+0x4f6/0xb60 arch/x86/mm/fault.c:1445 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1520 do_async_page_fault+0x72/0xc0 arch/x86/kernel/kvm.c:266 async_page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1069 RIP: 0033:0x4012c8 RSP: 002b:00007ffc12d93e10 EFLAGS: 00010286 RAX: ffffffffffffffff RBX: ffffffffffffffff RCX: 0000000000439779 RDX: 0000000000000000 RSI: 000000002076e000 RDI: ffffffffffffffff RBP: 00327265636e6575 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000286 R12: 7165732f7665642f R13: 646e732f7665642f R14: 0030656c69662f2e R15: 0000000000000000 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..