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) INFO: task syz-executor.3:4623 blocked for more than 140 seconds. Not tainted 4.19.142-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D30272 4623 28674 0x00000004 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 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3aa/0x760 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 register_netdevice_notifier+0x7b/0x5b0 net/core/dev.c:1639 raw_init+0x296/0x340 net/can/raw.c:343 can_create+0x27c/0x470 net/can/af_can.c:184 __sock_create+0x3d8/0x740 net/socket.c:1276 sock_create net/socket.c:1316 [inline] __sys_socket+0xef/0x200 net/socket.c:1346 __do_sys_socket net/socket.c:1355 [inline] __se_sys_socket net/socket.c:1353 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1353 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d5b9 Code: Bad RIP value. RSP: 002b:00007fa71cf5ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 0000000000032bc0 RCX: 000000000045d5b9 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 000000000118d020 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cfec R13: 00007fff38f9ba1f R14: 00007fa71cf5f9c0 R15: 000000000118cfec INFO: task syz-executor.3:4627 blocked for more than 140 seconds. Not tainted 4.19.142-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29944 4627 28674 0x00000004 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 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3aa/0x760 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 register_netdevice_notifier+0x7b/0x5b0 net/core/dev.c:1639 raw_init+0x296/0x340 net/can/raw.c:343 can_create+0x27c/0x470 net/can/af_can.c:184 __sock_create+0x3d8/0x740 net/socket.c:1276 sock_create net/socket.c:1316 [inline] __sys_socket+0xef/0x200 net/socket.c:1346 __do_sys_socket net/socket.c:1355 [inline] __se_sys_socket net/socket.c:1353 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1353 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d5b9 Code: Bad RIP value. RSP: 002b:00007fa71cf3dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 0000000000032bc0 RCX: 000000000045d5b9 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 000000000118d0c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118d08c R13: 00007fff38f9ba1f R14: 00007fa71cf3e9c0 R15: 000000000118d08c Showing all locks held in the system: 3 locks held by kworker/u4:0/7: 1 lock held by khungtaskd/1090: #0: 0000000041e0305d (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440 1 lock held by in:imklog/6196: #0: 000000002d5acd5e (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by rs:main Q:Reg/6197: #0: 00000000506e17fc (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 #1: 000000004333d827 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2776 [inline] #1: 000000004333d827 (sb_writers#3){.+.+}, at: vfs_write+0x463/0x540 fs/read_write.c:548 1 lock held by syz-executor.3/4623: #0: 00000000f7dcb928 (pernet_ops_rwsem){++++}, at: register_netdevice_notifier+0x7b/0x5b0 net/core/dev.c:1639 1 lock held by syz-executor.3/4627: #0: 00000000f7dcb928 (pernet_ops_rwsem){++++}, at: register_netdevice_notifier+0x7b/0x5b0 net/core/dev.c:1639 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1090 Comm: khungtaskd Not tainted 4.19.142-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/0x2fe lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 4.19.142-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:trace_hardirqs_off+0x1d/0x200 kernel/trace/trace_preemptirq.c:36 Code: 59 ea 30 00 e9 34 ff ff ff 0f 1f 40 00 41 56 41 55 41 54 55 53 e8 63 c9 fa ff 65 8b 1d cc 92 93 7e 31 ff 89 de e8 c3 ca fa ff <85> db 75 3e e8 4a c9 fa ff 65 c7 05 af 92 93 7e 01 00 00 00 65 8b RSP: 0018:ffff8880a9f0ef18 EFLAGS: 00000006 RAX: 0000000000000300 RBX: 0000000000000000 RCX: ffffffff816ee82d RDX: 0000000000000000 RSI: ffff8880a9f02240 RDI: 0000000000000005 RBP: ffffffff865b1a6b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880a9f02240 R13: ffffe8ffff8e6010 R14: ffff888212503cf8 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8760a35000 CR3: 000000009a510000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __local_bh_enable_ip+0x119/0x270 kernel/softirq.c:171 local_bh_enable include/linux/bottom_half.h:32 [inline] ip6t_do_table+0xd00/0x1940 net/ipv6/netfilter/ip6_tables.c:379 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_nf_forward_ip+0xc72/0x15e0 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] maybe_deliver+0x292/0x380 net/bridge/br_forward.c:184 br_flood+0x158/0x4d0 net/bridge/br_forward.c:226 br_handle_frame_finish+0xf41/0x1410 net/bridge/br_input.c:167 br_nf_hook_thresh+0x2a3/0x330 net/bridge/br_netfilter_hooks.c:1011 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+0x3f4/0x854 net/bridge/br_netfilter_ipv6.c:240 br_nf_pre_routing+0xf05/0x14fe 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+0xa60/0x13ae 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+0x239/0x6f0 net/core/dev.c:5848 napi_poll net/core/dev.c:6271 [inline] net_rx_action+0x4ac/0xfb0 net/core/dev.c:6337 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292 run_ksoftirqd+0x57/0x110 kernel/softirq.c:653 smpboot_thread_fn+0x655/0x9e0 kernel/smpboot.c:164 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415