WARNING: CPU: 0 PID: 9804 at ./include/net/sock.h:638 sk_del_node_init include/net/sock.h:638 [inline]
WARNING: CPU: 0 PID: 9804 at ./include/net/sock.h:638 smc_unhash_sk+0x335/0x450 net/smc/af_smc.c:90
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 9804 Comm: syzkaller618927 Not tainted 4.16.0-rc2+ #324
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x58/0x80 arch/x86/entry/entry_64.S:957
RIP: 0010:sk_del_node_init include/net/sock.h:638 [inline]
RIP: 0010:smc_unhash_sk+0x335/0x450 net/smc/af_smc.c:90
RSP: 0018:ffff8801b6b3f198 EFLAGS: 00010293
RAX: ffff8801d03e2700 RBX: 1ffff10036d67e37 RCX: ffffffff85a3f1f5
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 1ffff10036d67e3b
RBP: ffff8801b6b3f280 R08: dffffc0000000000 R09: 0000000000000004
R10: ffff8801b6b3f050 R11: 0000000000000004 R12: ffff8801b6b3f258
R13: ffffffff87669b40 R14: ffff8801cb508000 R15: 1ffff10036d67e3b
 smc_release+0x321/0x580 net/smc/af_smc.c:148
 sock_release+0x8d/0x1e0 net/socket.c:595
 sock_close+0x16/0x20 net/socket.c:1149
 __fput+0x327/0x7e0 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ad0 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x73a/0x16d0 kernel/signal.c:2469
 do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_64+0x6e5/0x940 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4468f9
RSP: 002b:00007f0c9f890db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000007
RAX: 0000000000000001 RBX: 00000000006e29dc RCX: 00000000004468f9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000020000080
RBP: 00000000006e29d8 R08: 00007f0c9f891700 R09: 0000000000000000
R10: 00007f0c9f891700 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdeebfcf4f R14: 00007f0c9f8919c0 R15: 0000000000000001
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..