TCP: request_sock_TCP: 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: 25965 Comm: kworker/0:7 Not tainted 4.20.0-rc2+ #190 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kobject: 'loop3' (00000000629ecb56): kobject_uevent_env Workqueue: events smc_tcp_listen_work RIP: 0010:kernel_accept+0x5a/0x310 net/socket.c:3245 kobject: 'loop3' (00000000629ecb56): fill_kobj_path: path = '/devices/virtual/block/loop3' Code: 48 c1 ea 03 80 3c 02 00 0f 85 4a 02 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5d 20 48 8d bb 50 03 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 14 02 00 00 48 8d 7b 10 0f b6 RSP: 0018:ffff888194e6f5b0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff11037e4e979 RDX: 000000000000006a RSI: ffffffff862407bf RDI: 0000000000000350 RBP: ffff888194e6f5e0 R08: ffff8881bf274bc8 R09: 0000000000000006 R10: 0000000000000000 R11: ffff8881bf274300 R12: ffff888194e6f690 R13: ffff888187c4a500 R14: 0000000000000000 R15: ffff8881920ab0b8 FS: 0000000000000000(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 kobject: 'loop3' (00000000629ecb56): kobject_uevent_env CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30927000 CR3: 000000019af6d000 CR4: 00000000001406f0 kobject: 'loop3' (00000000629ecb56): fill_kobj_path: path = '/devices/virtual/block/loop3' DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: smc_clcsock_accept net/smc/af_smc.c:834 [inline] smc_tcp_listen_work+0x218/0x11c0 net/smc/af_smc.c:1302 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 kobject: 'loop3' (00000000629ecb56): kobject_uevent_env kobject: 'loop3' (00000000629ecb56): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (0000000041f64fb0): kobject_uevent_env kobject: 'loop1' (0000000041f64fb0): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (000000002358b4c8): kobject_uevent_env worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kobject: 'loop2' (000000002358b4c8): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (0000000041f64fb0): kobject_uevent_env kobject: 'loop1' (0000000041f64fb0): fill_kobj_path: path = '/devices/virtual/block/loop1' kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Modules linked in: ip6_tunnel: M xmit: Local address not yet configured! kobject: 'loop0' (00000000e3a6814d): kobject_uevent_env ---[ end trace 81d3440909eb95d4 ]--- kobject: 'loop0' (00000000e3a6814d): fill_kobj_path: path = '/devices/virtual/block/loop0' RIP: 0010:kernel_accept+0x5a/0x310 net/socket.c:3245 Code: 48 c1 ea 03 80 3c 02 00 0f 85 4a 02 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5d 20 48 8d bb 50 03 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 14 02 00 00 48 8d 7b 10 0f b6 RSP: 0018:ffff888194e6f5b0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff11037e4e979 RDX: 000000000000006a RSI: ffffffff862407bf RDI: 0000000000000350 RBP: ffff888194e6f5e0 R08: ffff8881bf274bc8 R09: 0000000000000006 R10: 0000000000000000 R11: ffff8881bf274300 R12: ffff888194e6f690 R13: ffff888187c4a500 R14: 0000000000000000 R15: ffff8881920ab0b8 FS: 0000000000000000(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3092b000 CR3: 000000018f0fe000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400