net_ratelimit: 5 callbacks suppressed TCP: request_sock_TCPv6: Possible SYN flooding on port 2. Sending cookies. Check SNMP counters. kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 30147 Comm: syz-executor3 Not tainted 4.20.0-rc3+ #307 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid+0x84/0x100 lib/list_debug.c:51 Code: 0f 84 60 01 00 00 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 39 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 5f 49 8b 14 24 48 39 da 0f 85 4e 01 00 00 49 8d 7d kobject: 'loop0' (00000000251812f7): kobject_uevent_env RSP: 0018:ffff8881832fea48 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8881bd742318 RCX: ffffc9000c00f000 RDX: 0000000000000000 RSI: ffffffff8752dbb3 RDI: ffff8881bd742320 RBP: ffff8881832fea60 R08: ffff8881d376c440 R09: ffff8881832ff488 R10: ffffed103065feb6 R11: 0000000000000003 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8881ce6bd2e0 R15: dffffc0000000000 FS: 00007f746b3a2700(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4acc2fc000 CR3: 00000001ba12b000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:117 [inline] list_del_init include/linux/list.h:159 [inline] sctp_sched_dequeue_common+0xab/0x610 net/sctp/stream_sched.c:267 ip6_tunnel: ip6tnl2 xmit: Local address not yet configured! kobject: 'loop0' (00000000251812f7): fill_kobj_path: path = '/devices/virtual/block/loop0' sctp_sched_fcfs_dequeue+0x18d/0x280 net/sctp/stream_sched.c:90 sctp_outq_dequeue_data net/sctp/outqueue.c:90 [inline] sctp_outq_flush_data net/sctp/outqueue.c:1079 [inline] sctp_outq_flush+0x13e2/0x34f0 net/sctp/outqueue.c:1205 ip6_tunnel:  xmit: Local address not yet configured! ip6_tunnel:  xmit: Local address not yet configured! ip6_tunnel:  xmit: Local address not yet configured! sctp_outq_uncork+0x6a/0x80 net/sctp/outqueue.c:772 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1820 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline] sctp_do_sm+0x5ff/0x7180 net/sctp/sm_sideeffect.c:1191 sctp_primitive_SEND+0xa0/0xd0 net/sctp/primitive.c:178 sctp_sendmsg_to_asoc+0xa0b/0x1a10 net/sctp/socket.c:1955 sctp_sendmsg+0x13c2/0x1da0 net/sctp/socket.c:2113 inet_sendmsg+0x1a1/0x690 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 sock_write_iter+0x35e/0x5c0 net/socket.c:900 call_write_iter include/linux/fs.h:1857 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x6b8/0x9f0 fs/read_write.c:487 vfs_write+0x1fc/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457569 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f746b3a1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569 RDX: 0000000000034000 RSI: 0000000020000040 RDI: 0000000000000005 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f746b3a26d4 R13: 00000000004c5cde R14: 00000000004da090 R15: 00000000ffffffff Modules linked in: ip6_tunnel:  xmit: Local address not yet configured! ip6_tunnel:  xmit: Local address not yet configured! ip6_tunnel: ip6tnl2 xmit: Local address not yet configured! kobject: 'loop4' (000000006433af92): kobject_uevent_env kobject: 'loop4' (000000006433af92): fill_kobj_path: path = '/devices/virtual/block/loop4' TCP: request_sock_TCPv6: Possible SYN flooding on port 2. Sending cookies. Check SNMP counters. kobject: 'loop5' (00000000fed0fadf): kobject_uevent_env ---[ end trace 3ade49dc7f635fa6 ]--- RIP: 0010:__list_del_entry_valid+0x84/0x100 lib/list_debug.c:51 Code: 0f 84 60 01 00 00 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 39 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 5f 49 8b 14 24 48 39 da 0f 85 4e 01 00 00 49 8d 7d kobject: 'loop5' (00000000fed0fadf): fill_kobj_path: path = '/devices/virtual/block/loop5' RSP: 0018:ffff8881832fea48 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8881bd742318 RCX: ffffc9000c00f000 RDX: 0000000000000000 RSI: ffffffff8752dbb3 RDI: ffff8881bd742320 RBP: ffff8881832fea60 R08: ffff8881d376c440 R09: ffff8881832ff488 R10: ffffed103065feb6 R11: 0000000000000003 R12: 0000000000000000 kobject: 'loop2' (00000000f8b73866): kobject_uevent_env R13: 0000000000000000 R14: ffff8881ce6bd2e0 R15: dffffc0000000000 kobject: 'loop2' (00000000f8b73866): fill_kobj_path: path = '/devices/virtual/block/loop2' FS: 00007f746b3a2700(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 TCP: request_sock_TCPv6: Possible SYN flooding on port 2. Sending cookies. Check SNMP counters. CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kobject: 'loop0' (00000000251812f7): kobject_uevent_env CR2: 0000000000f1a7d0 CR3: 00000001ba12b000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kobject: 'loop0' (00000000251812f7): fill_kobj_path: path = '/devices/virtual/block/loop0' DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400