watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.5:9547] Modules linked in: irq event stamp: 3692815 hardirqs last enabled at (3692814): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (3692815): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (72338): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (74037): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (74037): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 9547 Comm: syz-executor.5 Not tainted 4.14.267-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88805046a540 task.stack: ffff888050470000 RIP: 0010:unwind_next_frame+0xe5b/0x17d0 arch/x86/kernel/unwind_orc.c:498 RSP: 0018:ffff8880ba407248 EFLAGS: 00000213 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000303 RBX: 1ffff11017480e50 RCX: 0000000000000000 RDX: 0000000000000302 RSI: ffff8880ba4071f8 RDI: 0000000000000001 RBP: ffff888050477918 R08: 0000000000000001 R09: 0000000000000001 R10: ffff888050477918 R11: 0000000000000001 R12: ffff888050470000 R13: ffff8880ba407340 R14: ffff8880ba407358 R15: ffff8880ba407308 FS: 00007fa1b8b51700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e827000 CR3: 00000000aaca2000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __save_stack_trace+0x90/0x160 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node_track_caller+0x4c/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] alloc_skb_with_frags+0x85/0x500 net/core/skbuff.c:5258 sock_alloc_send_pskb+0x577/0x6d0 net/core/sock.c:2101 __ip6_append_data.isra.0+0x161f/0x2860 net/ipv6/ip6_output.c:1457 ip6_append_data+0x1b8/0x2f0 net/ipv6/ip6_output.c:1620 icmp6_send+0x1564/0x1f60 net/ipv6/icmp.c:579 unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 __icmpv6_send include/linux/icmpv6.h:28 [inline] icmpv6_send include/linux/icmpv6.h:49 [inline] ip6_link_failure+0x2b/0x420 net/ipv6/route.c:1440 dst_link_failure include/net/dst.h:453 [inline] ndisc_error_report+0xa7/0x180 net/ipv6/ndisc.c:687 neigh_invalidate+0x21c/0x520 net/core/neighbour.c:897 neigh_timer_handler+0x820/0xa50 net/core/neighbour.c:983 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 RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x50 kernel/kcov.c:65 RSP: 0018:ffff888050477730 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: ffff88805046a540 RBX: 80000000a48ac007 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 00007fa1ba13f000 RDI: 80000000a48ac007 RBP: 1ffff1100a08eee9 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: ffff88805046a540 R12: 80000000a48ac007 R13: ffff8880aae4aa90 R14: 00007fa1ba13f000 R15: ffff888050477768 __pte_needs_invert arch/x86/include/asm/pgtable-invert.h:18 [inline] protnone_mask arch/x86/include/asm/pgtable-invert.h:24 [inline] pte_pfn arch/x86/include/asm/pgtable.h:195 [inline] _vm_normal_page+0xc6/0x3b0 mm/memory.c:855 zap_pte_range mm/memory.c:1337 [inline] zap_pmd_range mm/memory.c:1466 [inline] zap_pud_range mm/memory.c:1495 [inline] zap_p4d_range mm/memory.c:1516 [inline] unmap_page_range+0xcf0/0x1ce0 mm/memory.c:1537 unmap_single_vma+0x147/0x2b0 mm/memory.c:1582 unmap_vmas+0x9d/0x160 mm/memory.c:1612 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: 0033:0x7fa1ba1dc059 RSP: 002b:00007fa1b8b51218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fa1ba2eef68 RCX: 00007fa1ba1dc059 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fa1ba2eef68 RBP: 00007fa1ba2eef60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa1ba2eef6c R13: 00007ffca33cceef R14: 00007fa1b8b51300 R15: 0000000000022000 Code: 49 39 d4 0f 92 c1 48 39 d0 0f 93 c0 84 c1 74 0a 48 3b 2c 24 0f 86 99 02 00 00 bf 01 00 00 00 e8 8c a5 15 00 65 8b 15 75 01 df 7e <85> d2 b8 01 00 00 00 0f 85 08 f2 ff ff e8 07 9e dc ff e9 fe f1 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3012 Comm: kworker/u4:4 Not tainted 4.14.267-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net task: ffff8880abbaa440 task.stack: ffff8880abbb8000 RIP: 0010:__read_once_size include/linux/compiler.h:185 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_single+0x181/0x370 kernel/smp.c:302 RSP: 0018:ffff8880abbbf9e0 EFLAGS: 00000297 RAX: ffff8880abbaa440 RBX: 1ffff11015777f40 RCX: 1ffff110157755b1 RDX: 0000000000000000 RSI: ffff8880abbaad68 RDI: 0000000000000286 RBP: ffff8880abbbfa88 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff88f79c80 R14: 0000000000000001 R15: ffffffff88f7a0b0 FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000556b26b9f0e8 CR3: 000000009bdf9000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: _rcu_barrier+0x22d/0x3b0 kernel/rcu/tree.c:3595 netdev_wait_allrefs net/core/dev.c:7859 [inline] netdev_run_todo+0x7d9/0xad0 net/core/dev.c:7947 ip6gre_exit_net+0x423/0x570 net/ipv6/ip6_gre.c:1210 ops_exit_list+0xad/0x160 net/core/net_namespace.c:142 cleanup_net+0x3b3/0x840 net/core/net_namespace.c:487 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: ca 08 00 48 8b 54 24 10 4c 89 e9 8b 7c 24 1c 48 8d 74 24 40 e8 71 fa ff ff 41 89 c4 8b 44 24 58 a8 01 74 0f e8 e1 c9 08 00 f3 90 <8b> 44 24 58 a8 01 75 f1 e8 d2 c9 08 00 e8 cd c9 08 00 bf 01 00 ---------------- Code disassembly (best guess): 0: 49 39 d4 cmp %rdx,%r12 3: 0f 92 c1 setb %cl 6: 48 39 d0 cmp %rdx,%rax 9: 0f 93 c0 setae %al c: 84 c1 test %al,%cl e: 74 0a je 0x1a 10: 48 3b 2c 24 cmp (%rsp),%rbp 14: 0f 86 99 02 00 00 jbe 0x2b3 1a: bf 01 00 00 00 mov $0x1,%edi 1f: e8 8c a5 15 00 callq 0x15a5b0 24: 65 8b 15 75 01 df 7e mov %gs:0x7edf0175(%rip),%edx # 0x7edf01a0 * 2b: 85 d2 test %edx,%edx <-- trapping instruction 2d: b8 01 00 00 00 mov $0x1,%eax 32: 0f 85 08 f2 ff ff jne 0xfffff240 38: e8 07 9e dc ff callq 0xffdc9e44 3d: e9 .byte 0xe9 3e: fe (bad) 3f: f1 icebp