watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.2:9544] Modules linked in: irq event stamp: 4574279 hardirqs last enabled at (4574278): [<ffffffff87400976>] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (4574279): [<ffffffff874018ae>] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (82798): [<ffffffff8760068b>] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (83671): [<ffffffff81321cf3>] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (83671): [<ffffffff81321cf3>] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 9544 Comm: syz-executor.2 Not tainted 4.14.277-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88808f528240 task.stack: ffff888072110000 RIP: 0010:__read_once_size include/linux/compiler.h:185 [inline] RIP: 0010:queued_write_lock_slowpath+0x80/0x1d0 kernel/locking/qrwlock.c:130 RSP: 0018:ffff8880ba4077b8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 00000000000000ff RBX: ffffffff89d962b0 RCX: 0000000000000753 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89d962b0 RBP: ffffffff89d962b4 R08: ffffffff8b9a9558 R09: 00000000000421a4 R10: ffff88808f528b68 R11: ffff88808f528240 R12: fffffbfff13b2c56 R13: 0000000000000001 R14: 0000000000000000 R15: ffff88809efbc840 FS: 00007f7ceb4c2700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055bb586e0160 CR3: 0000000094919000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> queued_write_lock include/asm-generic/qrwlock.h:134 [inline] do_raw_write_lock+0xc2/0x1d0 kernel/locking/spinlock_debug.c:203 neigh_forced_gc net/core/neighbour.c:176 [inline] neigh_alloc net/core/neighbour.c:315 [inline] __neigh_create+0xb48/0x19c0 net/core/neighbour.c:499 ip6_finish_output2+0x802/0x1f10 net/ipv6/ip6_output.c:117 ip6_finish_output+0x5c6/0xd50 net/ipv6/ip6_output.c:192 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x1c5/0x660 net/ipv6/ip6_output.c:209 dst_output include/net/dst.h:470 [inline] NF_HOOK include/linux/netfilter.h:250 [inline] ndisc_send_skb+0x82a/0x1390 net/ipv6/ndisc.c:483 ndisc_send_rs+0x125/0x630 net/ipv6/ndisc.c:677 addrconf_rs_timer+0x2bb/0x5a0 net/ipv6/addrconf.c:3769 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280 expire_timers+0x232/0x4d0 kernel/time/timer.c:1319 __run_timers kernel/time/timer.c:1637 [inline] run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1650 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:638 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 </IRQ> RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_release+0x41e/0x870 kernel/locking/lockdep.c:4020 RSP: 0018:ffff888072117710 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e1311 RBX: 1ffff1100e422ee5 RCX: 1ffff11011ea515e RDX: dffffc0000000000 RSI: 0000000000000002 RDI: 0000000000000286 RBP: ffff88808f528240 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: ffff88808f528240 R12: 902dbacb38b3c08e R13: 0000000000000003 R14: ffff88808f528240 R15: 0000000000000002 page_remove_rmap+0x96/0xe0 mm/rmap.c:1293 zap_pte_range mm/memory.c:1375 [inline] zap_pmd_range mm/memory.c:1479 [inline] zap_pud_range mm/memory.c:1508 [inline] zap_p4d_range mm/memory.c:1529 [inline] unmap_page_range+0xf41/0x1d90 mm/memory.c:1550 unmap_single_vma+0x147/0x2b0 mm/memory.c:1595 unmap_vmas+0x9d/0x160 mm/memory.c:1625 exit_mmap+0x270/0x4d0 mm/mmap.c:3058 __mmput kernel/fork.c:931 [inline] mmput kernel/fork.c:952 [inline] mmput+0xfa/0x420 kernel/fork.c:947 exit_mm kernel/exit.c:548 [inline] do_exit+0x984/0x2850 kernel/exit.c:855 do_group_exit+0x100/0x2e0 kernel/exit.c:965 get_signal+0x38d/0x1ca0 kernel/signal.c:2412 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f7cecb4d0e9 RSP: 002b:00007f7ceb4c2218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f7cecc5ff68 RCX: 00007f7cecb4d0e9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7cecc5ff68 RBP: 00007f7cecc5ff60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7cecc5ff6c R13: 00007fff2388baff R14: 00007f7ceb4c2300 R15: 0000000000022000 Code: 0f 84 d3 00 00 00 49 89 dc 49 89 de 41 bd 01 00 00 00 49 c1 ec 03 41 83 e6 07 48 b8 00 00 00 00 00 fc ff df 49 01 c4 eb 02 f3 90 <41> 0f b6 04 24 44 38 f0 7f 08 84 c0 0f 85 f6 00 00 00 0f b6 03 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9558 Comm: syz-executor.1 Not tainted 4.14.277-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88808f60e5c0 task.stack: ffff888072128000 RIP: 0010:native_apic_mem_write+0x8/0x10 arch/x86/include/asm/apic.h:100 RSP: 0018:ffff8880ba507750 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffffffff88cca000 RCX: 0000000000000020 RDX: 1ffffffff119941d RSI: 000000000000004b RDI: 0000000000000380 RBP: ffff8880ba5282c0 R08: ffff88823fff7058 R09: ffff88823fff704f R10: ffff88823fff7057 R11: 00000019058280ae R12: 000000000000004b R13: 0000000000000003 R14: 000000177ce4611b R15: 69163f87eeede280 FS: 00007f813f753700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d825000 CR3: 000000009f2c0000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> apic_write arch/x86/include/asm/apic.h:385 [inline] lapic_next_event+0x53/0x80 arch/x86/kernel/apic/apic.c:468 clockevents_program_event+0x1f1/0x2d0 kernel/time/clockevents.c:339 tick_program_event+0x78/0xd0 kernel/time/tick-oneshot.c:47 hrtimer_interrupt+0x336/0x5e0 kernel/time/hrtimer.c:1334 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1079 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1104 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:67 RSP: 0018:ffff8880ba507948 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 RAX: dffffc00000000fc RBX: ffff8880997d2980 RCX: 0000000000000000 RDX: 0000000000000008 RSI: 00000000000000fc RDI: ffffed10132fa538 RBP: ffff8880997d27c0 R08: ffffed10132fa4f8 R09: ffffed10132fa530 R10: 0000000000000000 R11: ffff88808f60e5c0 R12: 0000000001090220 R13: 0000000000000040 R14: ffff88813fe74940 R15: 00000000000001c0 kasan_poison_shadow mm/kasan/kasan.c:64 [inline] kasan_kmalloc+0x84/0x160 mm/kasan/kasan.c:547 kmem_cache_alloc_node_trace+0x153/0x400 mm/slab.c:3661 __do_kmalloc_node mm/slab.c:3681 [inline] __kmalloc_node_track_caller+0x38/0x70 mm/slab.c:3696 __kmalloc_reserve net/core/skbuff.c:137 [inline] __alloc_skb+0x96/0x510 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:980 [inline] ndisc_alloc_skb+0x134/0x310 net/ipv6/ndisc.c:402 ndisc_send_rs+0x2ec/0x630 net/ipv6/ndisc.c:661 addrconf_rs_timer+0x2bb/0x5a0 net/ipv6/addrconf.c:3769 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280 expire_timers+0x232/0x4d0 kernel/time/timer.c:1319 __run_timers kernel/time/timer.c:1637 [inline] run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1650 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:638 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 </IRQ> RIP: 0010:compound_head include/linux/page-flags.h:149 [inline] RIP: 0010:PageAnon include/linux/page-flags.h:406 [inline] RIP: 0010:zap_pte_range mm/memory.c:1365 [inline] RIP: 0010:zap_pmd_range mm/memory.c:1479 [inline] RIP: 0010:zap_pud_range mm/memory.c:1508 [inline] RIP: 0010:zap_p4d_range mm/memory.c:1529 [inline] RIP: 0010:unmap_page_range+0xdd1/0x1d90 mm/memory.c:1550 RSP: 0018:ffff88807212f7c8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: dead000000000100 RBX: dffffc0000000000 RCX: ffff88807212f9d0 RDX: 0000000000000000 RSI: ffff88807212f9d0 RDI: ffff88807212f9e8 RBP: ffffea000249d180 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: ffff88808f60e5c0 R12: ffffea000249d1a0 R13: ffff8880a4bb9c30 R14: 00007f8140b87000 R15: 0000000000000000 unmap_single_vma+0x147/0x2b0 mm/memory.c:1595 unmap_vmas+0x9d/0x160 mm/memory.c:1625 exit_mmap+0x270/0x4d0 mm/mmap.c:3058 __mmput kernel/fork.c:931 [inline] mmput kernel/fork.c:952 [inline] mmput+0xfa/0x420 kernel/fork.c:947 exit_mm kernel/exit.c:548 [inline] do_exit+0x984/0x2850 kernel/exit.c:855 do_group_exit+0x100/0x2e0 kernel/exit.c:965 get_signal+0x38d/0x1ca0 kernel/signal.c:2412 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f8140dde0e9 RSP: 002b:00007f813f753168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: 0000000000000004 RBX: 00007f8140ef0f60 RCX: 00007f8140dde0e9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 00007f8140e3808d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc829c8c0f R14: 00007f813f753300 R15: 0000000000022000 Code: 83 3d 0c 1c 0c 0a 01 7f 02 5d c3 89 ef 5d e9 02 5f df 05 48 c7 c7 c0 a3 2e 8b e8 84 76 5c 00 eb df 66 90 89 ff 89 b7 00 c0 5f ff <c3> 0f 1f 80 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 53 89 fb ---------------- Code disassembly (best guess): 0: 0f 84 d3 00 00 00 je 0xd9 6: 49 89 dc mov %rbx,%r12 9: 49 89 de mov %rbx,%r14 c: 41 bd 01 00 00 00 mov $0x1,%r13d 12: 49 c1 ec 03 shr $0x3,%r12 16: 41 83 e6 07 and $0x7,%r14d 1a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 21: fc ff df 24: 49 01 c4 add %rax,%r12 27: eb 02 jmp 0x2b 29: f3 90 pause * 2b: 41 0f b6 04 24 movzbl (%r12),%eax <-- trapping instruction 30: 44 38 f0 cmp %r14b,%al 33: 7f 08 jg 0x3d 35: 84 c0 test %al,%al 37: 0f 85 f6 00 00 00 jne 0x133 3d: 0f b6 03 movzbl (%rbx),%eax