bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) INFO: task kworker/u4:5:19171 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:5 D26048 19171 2 0x80000000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x92d/0xfe0 kernel/time/timer.c:1794 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common+0x29c/0x470 kernel/sched/completion.c:115 flush_workqueue+0x40b/0x13e0 kernel/workqueue.c:2713 rxrpc_release_sock net/rxrpc/af_rxrpc.c:906 [inline] rxrpc_release+0x25b/0x530 net/rxrpc/af_rxrpc.c:936 __sock_release net/socket.c:599 [inline] sock_release+0x87/0x1d0 net/socket.c:619 afs_close_socket+0x1c7/0x320 fs/afs/rxrpc.c:119 afs_net_exit+0x1c1/0x310 fs/afs/main.c:155 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:153 cleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:554 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 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 00000000ec768c71 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7766: #0: 00000000ca7a9468 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by kworker/u4:6/8910: #0: 0000000059a588c7 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 0000000059a588c7 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 #1: 00000000afdd94e4 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 3 locks held by kworker/u4:5/19171: #0: 00000000f9a135a8 ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 000000009a682216 (net_cleanup_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 00000000529d0e24 (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x8b0 net/core/net_namespace.c:521 4 locks held by syz-executor.3/7085: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1570 Comm: khungtaskd 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_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 7085 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x47/0x50 kernel/kcov.c:111 Code: 90 60 13 00 00 83 fa 02 75 20 48 8b 88 68 13 00 00 8b 80 64 13 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 0f 1f 84 00 00 00 00 00 49 89 f1 49 89 fa 65 48 8b 34 25 c0 df RSP: 0018:ffff8880ba106a78 EFLAGS: 00000006 RAX: ffff88808f9ea200 RBX: 000003b010e15028 RCX: ffffffff815402aa RDX: 0000000000010100 RSI: ffffffff815402c3 RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000000 R09: 000003b010e15028 R10: 0000000000000006 R11: ffffffff8c66505b R12: ffff8880ba124cc0 R13: ffff888098869280 R14: 0000025cd6f2c13a R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4c45cff1b8 CR3: 0000000009e6d000 CR4: 00000000003426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __next_base kernel/time/hrtimer.c:480 [inline] __hrtimer_next_event_base+0x113/0x260 kernel/time/hrtimer.c:500 __hrtimer_get_next_event kernel/time/hrtimer.c:577 [inline] hrtimer_update_next_event kernel/time/hrtimer.c:602 [inline] hrtimer_interrupt+0x726/0x9e0 kernel/time/hrtimer.c:1588 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:check_kcov_mode kernel/kcov.c:67 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x14/0x50 kernel/kcov.c:101 Code: 35 00 e9 23 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 34 24 65 48 8b 04 25 c0 df 01 00 65 8b 15 cc 59 9f 7e <81> e2 00 01 1f 00 75 2b 8b 90 60 13 00 00 83 fa 02 75 20 48 8b 88 RSP: 0018:ffff8880ba106c88 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff88808f9ea200 RBX: 000000000002be80 RCX: 0000000000000000 RDX: 0000000000000302 RSI: ffffffff83772075 RDI: ffffffff89f88650 RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffed101742455a R10: ffff8880ba122ad3 R11: 0000000000000000 R12: ffffffff89f88280 R13: 0000000000000046 R14: 0000000000000000 R15: ffff888097b8dcc0 debug_smp_processor_id+0x5/0x20 lib/smp_processor_id.c:56 rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1078 [inline] rcu_lockdep_current_cpu_online+0xb2/0x1b0 kernel/rcu/tree.c:1068 rcu_read_lock_bh_held+0xcb/0x160 kernel/rcu/update.c:312 sch_handle_egress net/core/dev.c:3560 [inline] __dev_queue_xmit+0x16f2/0x2e00 net/core/dev.c:3788 br_dev_queue_push_xmit+0x25a/0x6c0 net/bridge/br_forward.c:56 br_nf_dev_queue_xmit+0x387/0x1970 net/bridge/br_netfilter_hooks.c:732 NF_HOOK include/linux/netfilter.h:289 [inline] br_nf_post_routing+0xa19/0x1110 net/bridge/br_netfilter_hooks.c:831 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] br_forward_finish+0x25a/0x3d0 net/bridge/br_forward.c:69 br_nf_hook_thresh+0x2a3/0x330 net/bridge/br_netfilter_hooks.c:1014 br_nf_forward_finish+0x335/0x6d0 net/bridge/br_netfilter_hooks.c:553 NF_HOOK include/linux/netfilter.h:289 [inline] br_nf_forward_ip+0xaae/0x15e0 net/bridge/br_netfilter_hooks.c:620 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] __br_forward+0x354/0xae0 net/bridge/br_forward.c:113 deliver_clone net/bridge/br_forward.c:129 [inline] br_flood+0x3c2/0x4d0 net/bridge/br_forward.c:238 br_handle_frame_finish+0xf41/0x1410 net/bridge/br_input.c:167 br_nf_hook_thresh+0x2a3/0x330 net/bridge/br_netfilter_hooks.c:1014 br_nf_pre_routing_finish_ipv6+0x6e3/0xd40 net/bridge/br_netfilter_ipv6.c:210 NF_HOOK include/linux/netfilter.h:289 [inline] br_nf_pre_routing_ipv6+0x3f4/0x860 net/bridge/br_netfilter_ipv6.c:240 br_nf_pre_routing+0xf05/0x1500 net/bridge/br_netfilter_hooks.c:494 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] br_handle_frame+0xa60/0x13b0 net/bridge/br_input.c:306 __netif_receive_skb_core+0x929/0x3270 net/core/dev.c:4876 __netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:4952 __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:_vm_normal_page+0x0/0x510 mm/memory.c:833 Code: e9 3a ff ff ff 48 c7 c7 50 b4 cf 89 e8 49 e0 0c 00 e9 98 fe ff ff 48 c7 c7 e8 b4 cf 89 e8 38 e0 0c 00 e9 d9 fe ff ff 0f 1f 00 <41> 57 41 56 49 89 f6 41 55 49 89 fd 41 54 55 53 48 bb 00 00 00 00 RSP: 0018:ffff8880151a7768 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff88808f9ea200 RBX: 8000000000000007 RCX: 0000000000000001 RDX: 8000000096f28007 RSI: 00007f65fa982000 RDI: ffff88804d56f840 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 8000000096f28007 R13: ffffea000284d5c0 R14: dffffc0000000000 R15: 00007f65fa983000 zap_pte_range mm/memory.c:1323 [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+0x1141/0x2c50 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: 0033:0x7f65fb3b9e99 Code: Bad RIP value. RSP: 002b:00007f65f9f2f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: fffffffffffffff4 RBX: 00007f65fb4ccf60 RCX: 00007f65fb3b9e99 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000000 RBP: 00007f65fb414031 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdda399aef R14: 00007f65f9f2f300 R15: 0000000000022000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 13 00 adc (%rax),%eax 2: 00 83 fa 02 75 20 add %al,0x207502fa(%rbx) 8: 48 8b 88 68 13 00 00 mov 0x1368(%rax),%rcx f: 8b 80 64 13 00 00 mov 0x1364(%rax),%eax 15: 48 8b 11 mov (%rcx),%rdx 18: 48 83 c2 01 add $0x1,%rdx 1c: 48 39 d0 cmp %rdx,%rax 1f: 76 07 jbe 0x28 21: 48 89 34 d1 mov %rsi,(%rcx,%rdx,8) 25: 48 89 11 mov %rdx,(%rcx) * 28: c3 retq <-- trapping instruction 29: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 30: 00 31: 49 89 f1 mov %rsi,%r9 34: 49 89 fa mov %rdi,%r10 37: 65 gs 38: 48 rex.W 39: 8b .byte 0x8b 3a: 34 25 xor $0x25,%al 3c: c0 .byte 0xc0 3d: df .byte 0xdf