protocol 2cea is buggy, dev gre0 protocol 2cea is buggy, dev gre0 protocol 2cea is buggy, dev gre0 protocol 2cea is buggy, dev gre0 ------------[ cut here ]------------ kernel BUG at net/ipv4/ip_output.c:777! kobject: 'loop4' (000000003fdc5c0a): fill_kobj_path: path = '/devices/virtual/block/loop4' invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 15487 Comm: syz-executor3 Not tainted 4.20.0-rc7+ #190 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ip_do_fragment+0x240c/0x2a90 net/ipv4/ip_output.c:777 Code: ff 48 89 cf e8 35 4d 31 fb e9 f5 ea ff ff 48 89 df e8 68 4d 31 fb e9 1b e7 ff ff e8 be 4d 31 fb e9 b0 e6 ff ff e8 94 5f ed fa <0f> 0b 4c 89 f7 e8 0a 4d 31 fb e9 48 e6 ff ff 4c 89 e7 e8 fd 4c 31 RSP: 0018:ffff88806877e3a0 EFLAGS: 00010216 RAX: 0000000000040000 RBX: ffff8880a0927b80 RCX: ffffc9000be2b000 RDX: 000000000003e9bf RSI: ffffffff8691c7fc RDI: 0000000000000005 kobject: 'loop5' (00000000d2ff9e04): kobject_uevent_env RBP: ffff88806877e578 R08: ffff8880709ca3c0 R09: ffffed101236ac42 R10: ffffed101236ac44 R11: ffff888091b56223 R12: ffff8880a0927c34 R13: 00000000fffffff2 R14: ffff8880a0927c40 R15: dffffc0000000000 FS: 00007ff8e6d64700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004d2970 CR3: 00000000a410f000 CR4: 00000000001406f0 kobject: 'i' (000000000c8859a8): kobject_add_internal: parent: 'net', set: 'devices' DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: kobject: 'loop5' (00000000d2ff9e04): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'i' (000000000c8859a8): kobject_uevent_env ip_fragment.constprop.53+0x179/0x240 net/ipv4/ip_output.c:550 ip_finish_output+0x6ae/0xfa0 net/ipv4/ip_output.c:315 kobject: 'i' (000000000c8859a8): fill_kobj_path: path = '/devices/virtual/net/i' NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_mc_output+0x2be/0x15b0 net/ipv4/ip_output.c:390 kobject: 'loop0' (00000000d5b38688): kobject_uevent_env kobject: 'queues' (0000000009c67354): kobject_add_internal: parent: 'i', set: '' ********************************************************** dst_output include/net/dst.h:444 [inline] ip_local_out+0xc5/0x1b0 net/ipv4/ip_output.c:124 kobject: 'queues' (0000000009c67354): kobject_uevent_env iptunnel_xmit+0x604/0x980 net/ipv4/ip_tunnel_core.c:91 ip_tunnel_xmit+0x15a4/0x3be4 net/ipv4/ip_tunnel.c:787 kobject: 'loop0' (00000000d5b38688): fill_kobj_path: path = '/devices/virtual/block/loop0' ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** kobject: 'queues' (0000000009c67354): kobject_uevent_env: filter function caused the event to drop! __gre_xmit+0x5e9/0x980 net/ipv4/ip_gre.c:453 ipgre_xmit+0x3e1/0xba0 net/ipv4/ip_gre.c:707 kobject: 'loop4' (000000003fdc5c0a): kobject_uevent_env __netdev_start_xmit include/linux/netdevice.h:4382 [inline] netdev_start_xmit include/linux/netdevice.h:4391 [inline] xmit_one net/core/dev.c:3278 [inline] dev_hard_start_xmit+0x286/0xc70 net/core/dev.c:3294 kobject: 'loop4' (000000003fdc5c0a): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'rx-0' (00000000e00b07e3): kobject_add_internal: parent: 'queues', set: 'queues' ** ** kobject: 'loop1' (00000000437b9f31): kobject_uevent_env kobject: 'rx-0' (00000000e00b07e3): kobject_uevent_env __dev_queue_xmit+0x2f5f/0x3ac0 net/core/dev.c:3864 kobject: 'loop1' (00000000437b9f31): fill_kobj_path: path = '/devices/virtual/block/loop1' ** trace_printk() being used. Allocating extra memory. ** kobject: 'rx-0' (00000000e00b07e3): fill_kobj_path: path = '/devices/virtual/net/i/queues/rx-0' ** ** kobject: 'loop1' (00000000437b9f31): kobject_uevent_env kobject: 'tx-0' (00000000485c0910): kobject_add_internal: parent: 'queues', set: 'queues' dev_queue_xmit+0x17/0x20 net/core/dev.c:3897 __bpf_tx_skb net/core/filter.c:2014 [inline] __bpf_redirect_common net/core/filter.c:2052 [inline] __bpf_redirect+0x5ca/0xb40 net/core/filter.c:2059 kobject: 'loop1' (00000000437b9f31): fill_kobj_path: path = '/devices/virtual/block/loop1' ____bpf_clone_redirect net/core/filter.c:2092 [inline] bpf_clone_redirect+0x2e4/0x480 net/core/filter.c:2064 bpf_prog_bebbfe2050753572+0x585/0x1000 ** This means that this is a DEBUG kernel and it is ** kobject: 'tx-0' (00000000485c0910): kobject_uevent_env kobject: 'tx-0' (00000000485c0910): fill_kobj_path: path = '/devices/virtual/net/i/queues/tx-0' ** unsafe for production use. ** Modules linked in: ---[ end trace 75fca42ca1d0f05b ]--- RIP: 0010:ip_do_fragment+0x240c/0x2a90 net/ipv4/ip_output.c:777 kobject: 'loop4' (000000003fdc5c0a): kobject_uevent_env Code: ff 48 89 cf e8 35 4d 31 fb e9 f5 ea ff ff 48 89 df e8 68 4d 31 fb e9 1b e7 ff ff e8 be 4d 31 fb e9 b0 e6 ff ff e8 94 5f ed fa <0f> 0b 4c 89 f7 e8 0a 4d 31 fb e9 48 e6 ff ff 4c 89 e7 e8 fd 4c 31 RSP: 0018:ffff88806877e3a0 EFLAGS: 00010216 kobject: 'loop4' (000000003fdc5c0a): fill_kobj_path: path = '/devices/virtual/block/loop4' RAX: 0000000000040000 RBX: ffff8880a0927b80 RCX: ffffc9000be2b000 RDX: 000000000003e9bf RSI: ffffffff8691c7fc RDI: 0000000000000005 RBP: ffff88806877e578 R08: ffff8880709ca3c0 R09: ffffed101236ac42 R10: ffffed101236ac44 R11: ffff888091b56223 R12: ffff8880a0927c34 R13: 00000000fffffff2 R14: ffff8880a0927c40 R15: dffffc0000000000 FS: 00007ff8e6d64700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004d2970 CR3: 00000000a410f000 CR4: 00000000001406f0 kobject: 'batman_adv' (000000003585c55b): kobject_add_internal: parent: 'i', set: '' DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 ** ** DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ** If you see this message and you are not debugging **