bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) rcu: INFO: rcu_sched self-detected stall on CPU rcu: 0-....: (10474 ticks this GP) idle=632/1/0x4000000000000004 softirq=94106/94248 fqs=3341 rcu: (t=10501 jiffies g=19693 q=7) NMI backtrace for cpu 0 CPU: 0 PID: 24279 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15f/0x19c kernel/rcu/tree.c:1340 print_cpu_stall kernel/rcu/tree.c:1478 [inline] check_cpu_stall kernel/rcu/tree.c:1550 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0x62d/0xe19 kernel/rcu/tree.c:2682 update_process_times+0x2a/0x70 kernel/time/timer.c:1650 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1465 [inline] __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1527 hrtimer_interrupt+0x326/0x9e0 kernel/time/hrtimer.c:1585 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:ipv6_ext_hdr+0x2/0x50 net/ipv6/exthdrs_core.c:13 Code: e8 03 3e 68 fa 48 89 ef 5b 5d e9 99 7b 78 fa e8 e4 a9 78 fa eb 9e e8 dd a9 78 fa eb df e8 d6 a9 78 fa eb b4 90 90 90 90 41 54 <45> 31 e4 53 89 fb e8 d3 cc 42 fa 89 de bf 3c 00 00 00 e8 f7 cd 42 RSP: 0018:ffff8880ba0079f8 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: ffff888097d74200 RBX: 0000000000000000 RCX: ffffffff8719ac71 RDX: 0000000000000100 RSI: ffffffff8719accc RDI: 0000000000000000 RBP: ffff8880ba007b70 R08: 0000000000000000 R09: 000000000000002c R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000028 R13: 0000000000000038 R14: 0000000000000028 R15: ffff8880a1adb800 find_prev_fhdr net/ipv6/netfilter/nf_conntrack_reasm.c:415 [inline] nf_ct_frag6_gather+0x324/0x23d0 net/ipv6/netfilter/nf_conntrack_reasm.c:466 ipv6_defrag net/ipv6/netfilter/nf_defrag_ipv6_hooks.c:69 [inline] ipv6_defrag+0x22b/0x3e0 net/ipv6/netfilter/nf_defrag_ipv6_hooks.c:54 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline] nf_hook_slow+0xc5/0x1e0 net/netfilter/core.c:511 nf_hook include/linux/netfilter.h:244 [inline] NF_HOOK include/linux/netfilter.h:287 [inline] ipv6_rcv+0x26a/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 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:rcu_read_unlock_special+0x456/0xfc0 kernel/rcu/tree_plugin.h:601 Code: 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 bd 09 00 00 48 83 3d ee 24 a0 08 00 0f 84 37 06 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 83 c4 40 5b 5d 41 5c 41 5d 41 5e 41 5f c3 c3 48 RSP: 0018:ffff888051c276a0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3051 RBX: 0000000000000000 RCX: 1ffff11012fae955 RDX: dffffc0000000000 RSI: ffff888097d74ab0 RDI: 0000000000000286 RBP: ffff888097d74574 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888097d74200 R13: ffff888097d74576 R14: ffff888097d74575 R15: 0000000000000001 __rcu_read_unlock+0x158/0x160 kernel/rcu/tree_plugin.h:428 rcu_read_unlock include/linux/rcupdate.h:680 [inline] __unlock_page_memcg+0x54/0x100 mm/memcontrol.c:1955 page_remove_rmap+0xe5/0x120 mm/rmap.c:1297 zap_pte_range mm/memory.c:1350 [inline] zap_pmd_range mm/memory.c:1463 [inline] zap_pud_range mm/memory.c:1492 [inline] zap_p4d_range mm/memory.c:1513 [inline] unmap_page_range+0x147d/0x2c50 mm/memory.c:1534 unmap_single_vma+0x198/0x300 mm/memory.c:1579 unmap_vmas+0xa9/0x180 mm/memory.c:1609 exit_mmap+0x2b9/0x530 mm/mmap.c:3093 __mmput kernel/fork.c:1016 [inline] mmput+0x14e/0x4a0 kernel/fork.c:1037 exit_mm kernel/exit.c:549 [inline] do_exit+0xaec/0x2be0 kernel/exit.c:857 do_group_exit+0x125/0x310 kernel/exit.c:967 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f6b4f2e0109 Code: Bad RIP value. RSP: 002b:00007f6b4dc55168 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: 0000000000000003 RBX: 00007f6b4f3f2f60 RCX: 00007f6b4f2e0109 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00000000200007c0 RBP: 00007f6b4f33a05d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff1d3f981f R14: 00007f6b4dc55300 R15: 0000000000022000 net_ratelimit: 11159 callbacks suppressed bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:4a:33:7b:bb:94:00, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:4a:33:7b:bb:94:00, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:4a:33:7b:bb:94:00, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) net_ratelimit: 11089 callbacks suppressed bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:4a:33:7b:bb:94:00, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) ---------------- Code disassembly (best guess): 0: e8 03 3e 68 fa callq 0xfa683e08 5: 48 89 ef mov %rbp,%rdi 8: 5b pop %rbx 9: 5d pop %rbp a: e9 99 7b 78 fa jmpq 0xfa787ba8 f: e8 e4 a9 78 fa callq 0xfa78a9f8 14: eb 9e jmp 0xffffffb4 16: e8 dd a9 78 fa callq 0xfa78a9f8 1b: eb df jmp 0xfffffffc 1d: e8 d6 a9 78 fa callq 0xfa78a9f8 22: eb b4 jmp 0xffffffd8 24: 90 nop 25: 90 nop 26: 90 nop 27: 90 nop 28: 41 54 push %r12 * 2a: 45 31 e4 xor %r12d,%r12d <-- trapping instruction 2d: 53 push %rbx 2e: 89 fb mov %edi,%ebx 30: e8 d3 cc 42 fa callq 0xfa42cd08 35: 89 de mov %ebx,%esi 37: bf 3c 00 00 00 mov $0x3c,%edi 3c: e8 .byte 0xe8 3d: f7 .byte 0xf7 3e: cd 42 int $0x42