watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.0:6746] Modules linked in: irq event stamp: 2335741 hardirqs last enabled at (2335740): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (2335741): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (1048): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (2169): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (2169): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 0 PID: 6746 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 RIP: 0010:fib6_walk_continue+0x1ca/0x8d0 net/ipv6/ip6_fib.c:1937 Code: 3c 28 00 0f 85 2f 05 00 00 49 8b 46 08 49 89 c5 e8 2b 37 47 fa 49 8d 7e 10 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 43 05 00 00 <49> 8b 46 10 48 89 44 24 10 48 8b 44 24 08 48 c1 e8 03 80 3c 28 00 RSP: 0018:ffff8880ba007700 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff110031c17b2 RBX: ffff888018e0b880 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff888018e0bd90 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000000 R12: ffff8880ba0077c0 R13: ffff888018e0b880 R14: ffff888018e0bd80 R15: ffffed1017400efd FS: 00007f5ed4535700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32622000 CR3: 0000000018c5f000 CR4: 00000000003426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:1970 fib6_clean_tree+0xc2/0x100 net/ipv6/ip6_fib.c:2047 __fib6_clean_all+0x11f/0x2a0 net/ipv6/ip6_fib.c:2063 fib6_clean_all net/ipv6/ip6_fib.c:2074 [inline] fib6_run_gc+0x110/0x2d0 net/ipv6/ip6_fib.c:2130 ip6_dst_gc+0x201/0x380 net/ipv6/route.c:2775 dst_alloc+0x14f/0x1a0 net/core/dst.c:101 ip6_dst_alloc+0x2e/0x100 net/ipv6/route.c:357 icmp6_dst_alloc+0x1ab/0x660 net/ipv6/route.c:2731 ndisc_send_skb+0xd10/0x1720 net/ipv6/ndisc.c:471 ndisc_send_rs+0x131/0x690 net/ipv6/ndisc.c:685 addrconf_rs_timer+0x384/0x6a0 net/ipv6/addrconf.c:3835 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:unwind_next_frame+0x50f/0x1400 arch/x86/kernel/unwind_orc.c:435 Code: 00 00 31 c0 e9 a4 fb ff ff 48 ba 00 00 00 00 00 fc ff df 4c 89 c6 49 8d 48 01 48 c1 ee 03 0f b6 34 16 48 89 cf 48 89 4c 24 20 <48> c1 ef 03 0f b6 14 17 4c 89 c7 83 e7 07 40 38 fe 40 0f 9e c7 40 RSP: 0018:ffff8880179d7760 EFLAGS: 00000a07 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000005 RBX: 1ffff11002f3aef5 RCX: ffffffff8b9b234d RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff8b9b234d RBP: 0000000000000001 R08: ffffffff8b9b234c R09: ffffffff8b9b2348 R10: ffff8880179d78ef R11: 0000000000074071 R12: ffff8880179d78d8 R13: ffff8880179d78c5 R14: ffff8880179d7890 R15: ffffffff8b9b2348 __save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553 slab_post_alloc_hook mm/slab.h:445 [inline] slab_alloc mm/slab.c:3397 [inline] kmem_cache_alloc+0x110/0x370 mm/slab.c:3557 alloc_inode+0xab/0x180 fs/inode.c:213 new_inode_pseudo fs/inode.c:911 [inline] new_inode+0x1d/0xf0 fs/inode.c:940 debugfs_get_inode+0x1a/0x130 fs/debugfs/inode.c:37 __debugfs_create_file+0xb2/0x480 fs/debugfs/inode.c:357 kvm_create_vm_debugfs arch/x86/kvm/../../../virt/kvm/kvm_main.c:650 [inline] kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:3475 [inline] kvm_dev_ioctl+0xa2b/0x16e0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3502 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f5ed5bc0409 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5ed4535168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f5ed5cd2f80 RCX: 00007f5ed5bc0409 RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004 RBP: 00007f5ed5c1b367 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcf2b0503f R14: 00007f5ed4535300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 23523 Comm: kworker/1:28 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Workqueue: events ipvlan_process_multicast RIP: 0010:fib6_ignore_linkdown net/ipv6/route.c:657 [inline] RIP: 0010:find_match.part.0+0xee/0x1530 net/ipv6/route.c:673 Code: a8 84 c0 0f 84 6d 0a 00 00 e8 7e fe 5a fa 49 8d be 3c 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 5d 0e 00 00 45 RSP: 0018:ffff8880ba107680 EFLAGS: 00000a07 RAX: dffffc0000000000 RBX: ffff888025cc0640 RCX: ffffffff87079192 RDX: 0000000000000000 RSI: ffffffff870786f2 RDI: ffff88809099f8bc RBP: ffff8880ba107728 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000396 R14: ffff88809099f680 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c024875000 CR3: 000000004190e000 CR4: 00000000003426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: find_match net/ipv6/route.c:670 [inline] find_rr_leaf net/ipv6/route.c:719 [inline] rt6_select net/ipv6/route.c:769 [inline] fib6_table_lookup+0x4c2/0xf40 net/ipv6/route.c:1876 ip6_pol_route+0x180/0x1270 net/ipv6/route.c:1909 fib6_rule_lookup+0x10b/0x4e0 net/ipv6/fib6_rules.c:118 ip6_route_input_lookup net/ipv6/route.c:1990 [inline] ip6_route_input+0x6c0/0xaa0 net/ipv6/route.c:2125 ip6_rcv_finish_core.constprop.0.isra.0+0xd7/0x550 net/ipv6/ip6_input.c:63 ip6_rcv_finish+0x176/0x2f0 net/ipv6/ip6_input.c:74 NF_HOOK include/linux/netfilter.h:289 [inline] ipv6_rcv+0xf2/0x3f0 net/ipv6/ip6_input.c:273 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:4954 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066 process_backlog+0x241/0x700 net/core/dev.c:5849 napi_poll net/core/dev.c:6280 [inline] net_rx_action+0x4ac/0xfb0 net/core/dev.c:6346 __do_softirq+0x265/0x980 kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1092 do_softirq.part.0+0x160/0x1c0 kernel/softirq.c:336 do_softirq kernel/softirq.c:328 [inline] __local_bh_enable_ip+0x20e/0x270 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] ipvlan_process_multicast+0x79c/0xcb0 drivers/net/ipvlan/ipvlan_core.c:284 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415