watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.0:9518] Modules linked in: irq event stamp: 4259811 hardirqs last enabled at (4259810): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (4259811): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (126666): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (127839): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (127839): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 9518 Comm: syz-executor.0 Not tainted 4.14.268-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809b030500 task.stack: ffff888052f20000 RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:109 [inline] RIP: 0010:unwind_next_frame+0x4dc/0x17d0 arch/x86/kernel/unwind_orc.c:348 RSP: 0018:ffff8880ba407698 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000003 RBX: 1ffff11017480eda RCX: ffffffff81785adc RDX: 000000000000785a RSI: 000000000000785a RDI: ffffffff8ae8f388 RBP: 0000000000000001 R08: 000000000000785b R09: 0000000000000001 R10: 000000000001cc8a R11: 0000000000066071 R12: ffff8880ba40778d R13: ffff8880ba407790 R14: ffff8880ba4077a8 R15: ffff8880ba407758 FS: 00007f67d0cde700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff2a5d6c10 CR3: 000000009334a000 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 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc_trace+0x11b/0x3d0 mm/slab.c:3616 kmalloc include/linux/slab.h:488 [inline] dst_cow_metrics_generic+0x48/0x130 net/core/dst.c:210 ipv6_cow_metrics+0x70/0x180 net/ipv6/route.c:196 dst_metrics_write_ptr include/net/dst.h:146 [inline] dst_metric_set include/net/dst.h:207 [inline] icmp6_dst_alloc+0x3f6/0x580 net/ipv6/route.c:1782 ndisc_send_skb+0xace/0x1390 net/ipv6/ndisc.c:463 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 RIP: 0010:debug_lockdep_rcu_enabled+0x27/0xe0 kernel/rcu/update.c:299 RSP: 0018:ffff888052f27890 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000007 RBX: 0000000000000000 RCX: 1ffffffff1412950 RDX: 0000000000000000 RSI: 0000000000000076 RDI: ffffffff87918520 RBP: ffffffff87918520 R08: ffff8880b4c18438 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88809b030500 R12: 0000000000000076 R13: ffff88809c2f3710 R14: ffff8880b4c183a0 R15: dead000000000200 ___might_sleep+0x15/0x2b0 kernel/sched/core.c:6006 anon_vma_free mm/rmap.c:118 [inline] __put_anon_vma+0x83/0x2c0 mm/rmap.c:1713 put_anon_vma include/linux/rmap.h:116 [inline] unlink_anon_vmas+0x4fd/0x7e0 mm/rmap.c:416 free_pgtables+0x178/0x2b0 mm/memory.c:665 exit_mmap+0x27f/0x4d0 mm/mmap.c:3059 __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: 0033:0x7f67d2369049 RSP: 002b:00007f67d0cde218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f67d247bf68 RCX: 00007f67d2369049 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f67d247bf68 RBP: 00007f67d247bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f67d247bf6c R13: 00007ffe14f444cf R14: 00007f67d0cde300 R15: 0000000000022000 Code: 18 48 89 4c 24 10 e8 d4 7e 5b 00 48 8b 54 24 28 48 8b 74 24 20 44 8b 5c 24 18 48 8b 4c 24 10 44 8d 46 01 44 8b 14 95 20 12 e7 8a <48> ba 00 00 00 00 00 fc ff df 4a 8d 3c 85 20 12 e7 8a 49 89 f9 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9536 Comm: syz-executor.1 Not tainted 4.14.268-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809dd20280 task.stack: ffff888052860000 RIP: 0010:__lock_acquire+0x197/0x3f20 kernel/locking/lockdep.c:3348 RSP: 0018:ffff8880ba506c90 EFLAGS: 00000086 RAX: ffffed10174a0da6 RBX: ffffffff8b39bce0 RCX: 00000000000073ba RDX: 1ffff11013ba4160 RSI: 0000000000000001 RDI: ffffffff8b39bcf8 RBP: dffffc0000000000 R08: ffffffff8b9dc890 R09: 00000000000c6051 R10: ffff88809dd20bf8 R11: ffff88809dd20280 R12: ffff88809dd20c10 R13: 0000000000000001 R14: a39a4e42d42a1325 R15: ffffffff8beced40 FS: 00007f79ab853700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556756848 CR3: 00000000abae3000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152 __run_hrtimer kernel/time/hrtimer.c:1225 [inline] __hrtimer_run_queues+0x353/0xc80 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 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:__orc_find+0x58/0xf0 arch/x86/kernel/unwind_orc.c:47 RSP: 0018:ffff8880ba507128 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: 1ffff110174a0e35 RCX: ffffffff81391e77 RDX: 0000000000000002 RSI: ffffffff8a6bda46 RDI: ffffffff8a14f730 RBP: ffffffff8a14f730 R08: ffffffff8a6bda46 R09: ffffffff8a6bda58 R10: 000000000000ca4f R11: 0000000000066071 R12: ffffffff8a14f738 R13: ffffffff8a14f730 R14: ffffffff8a14f730 R15: dffffc0000000000 orc_find arch/x86/kernel/unwind_orc.c:118 [inline] unwind_next_frame+0x59a/0x17d0 arch/x86/kernel/unwind_orc.c:348 __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 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc+0x111/0x3c0 mm/slab.c:3550 skb_clone+0x126/0x9a0 net/core/skbuff.c:1291 deliver_clone net/bridge/br_forward.c:121 [inline] maybe_deliver+0x18a/0x270 net/bridge/br_forward.c:168 br_flood+0x118/0x410 net/bridge/br_forward.c:210 br_dev_xmit+0x950/0xd40 net/bridge/br_device.c:83 __netdev_start_xmit include/linux/netdevice.h:4052 [inline] netdev_start_xmit include/linux/netdevice.h:4061 [inline] xmit_one net/core/dev.c:3005 [inline] dev_hard_start_xmit+0x188/0x890 net/core/dev.c:3021 __dev_queue_xmit+0x1d7f/0x2480 net/core/dev.c:3521 neigh_resolve_output+0x4e5/0x870 net/core/neighbour.c:1369 neigh_output include/net/neighbour.h:500 [inline] ip6_finish_output2+0xf48/0x1f10 net/ipv6/ip6_output.c:120 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 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x50/0x80 kernel/locking/spinlock.c:200 RSP: 0018:ffff8880528673a8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e127b RBX: ffff88809dd20280 RCX: 1ffff11013ba4165 RDX: dffffc0000000000 RSI: ffff88809dd20b08 RDI: ffff88809dd20b04 RBP: ffff8880ba534380 R08: ffffffff8b9c6648 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ba534380 R13: ffff88809f05e140 R14: 0000000000000000 R15: ffff8880ba534cd0 finish_lock_switch kernel/sched/sched.h:1346 [inline] finish_task_switch+0x178/0x610 kernel/sched/core.c:2678 context_switch kernel/sched/core.c:2814 [inline] __schedule+0x893/0x1de0 kernel/sched/core.c:3387 preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:3614 retint_kernel+0x1b/0x2d RIP: 0010:flush_work+0x5e0/0x770 kernel/workqueue.c:2898 RSP: 0018:ffff8880528675a8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000040000 RBX: ffff8880af2f2948 RCX: ffffc90006812000 RDX: 0000000000040000 RSI: ffffffff81367f09 RDI: ffff88809dd20b04 RBP: ffff8880528676f0 R08: ffffffff8b9a3f20 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: ffff8880af2f2968 R15: ffff8880528896b0 n_tty_poll+0x4de/0x7d0 drivers/tty/n_tty.c:2412 tty_poll+0x129/0x1a0 drivers/tty/tty_io.c:2102 do_select+0xa83/0x1290 fs/select.c:513 core_sys_select+0x32f/0x6a0 fs/select.c:656 do_pselect fs/select.c:733 [inline] SYSC_pselect6 fs/select.c:774 [inline] SyS_pselect6+0x358/0x3c0 fs/select.c:759 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f79acede049 RSP: 002b:00007f79ab853168 EFLAGS: 00000246 ORIG_RAX: 000000000000010e RAX: ffffffffffffffda RBX: 00007f79acff0f60 RCX: 00007f79acede049 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0e67d2ad1e0ff6b8 RBP: 00007f79acf3808d R08: 0000000020000200 R09: 0000000000000000 R10: 0000000020000140 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff1205b22f R14: 00007f79ab853300 R15: 0000000000022000 Code: 85 c0 44 8b 4c 24 10 4c 8b 5c 24 18 0f 85 a0 00 00 00 45 31 ed 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 08 48 c7 00 00 00 00 00 <48> c7 40 08 00 00 00 00 c7 40 18 00 00 00 00 48 81 c4 80 01 00 ---------------- Code disassembly (best guess): 0: 18 48 89 sbb %cl,-0x77(%rax) 3: 4c 24 10 rex.WR and $0x10,%al 6: e8 d4 7e 5b 00 callq 0x5b7edf b: 48 8b 54 24 28 mov 0x28(%rsp),%rdx 10: 48 8b 74 24 20 mov 0x20(%rsp),%rsi 15: 44 8b 5c 24 18 mov 0x18(%rsp),%r11d 1a: 48 8b 4c 24 10 mov 0x10(%rsp),%rcx 1f: 44 8d 46 01 lea 0x1(%rsi),%r8d 23: 44 8b 14 95 20 12 e7 mov -0x7518ede0(,%rdx,4),%r10d 2a: 8a * 2b: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx <-- trapping instruction 32: fc ff df 35: 4a 8d 3c 85 20 12 e7 lea -0x7518ede0(,%r8,4),%rdi 3c: 8a 3d: 49 89 f9 mov %rdi,%r9