WARNING: CPU: 3 PID: 2975 at mm/slab_common.c:1001 kmalloc_slab+0x5d/0x70 mm/slab_common.c:1001
Kernel panic - not syncing: panic_on_warn set ...

CPU: 3 PID: 2975 Comm: syzkaller794228 Not tainted 4.14.0-rc5-next-20171018+ #8
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1c4/0x1e0 kernel/panic.c:546
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:177
 do_trap_no_signal arch/x86/kernel/traps.c:211 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:260
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:297
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:310
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905
RIP: 0010:kmalloc_slab+0x5d/0x70 mm/slab_common.c:1001
RSP: 0018:ffff88006dbc74b0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88006dbc7748 RCX: ffffffff843a9363
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffffff8800
RBP: ffff88006dbc74b0 R08: ffff88006984ee00 R09: ffff88006dbc7b10
R10: ffff88006dbc7678 R11: 0000000000000000 R12: ffff88006dbc7ab0
R13: ffff88006dbc7b10 R14: 00000000014080c0 R15: ffff8800683a4800
 __do_kmalloc mm/slab.c:3707 [inline]
 __kmalloc+0x25/0x760 mm/slab.c:3721
 kmalloc include/linux/slab.h:507 [inline]
 kzalloc include/linux/slab.h:691 [inline]
 ip6_setup_cork+0x1e8/0x15c0 net/ipv6/ip6_output.c:1164
 ip6_make_skb+0x282/0x530 net/ipv6/ip6_output.c:1729
 udpv6_sendmsg+0x2769/0x3380 net/ipv6/udp.c:1340
 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763
 sock_sendmsg_nosec net/socket.c:632 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:642
 SYSC_sendto+0x352/0x5a0 net/socket.c:1749
 SyS_sendto+0x40/0x50 net/socket.c:1717
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x4351b9
RSP: 002b:00007ffd32c36a18 EFLAGS: 00000217 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00000000006c3a80 RCX: 00000000004351b9
RDX: 0000000000000000 RSI: 000000002052bfcc RDI: 0000000000000006
RBP: 0000000000000082 R08: 0000000020e0afe4 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000217 R12: 505daaef76b36d7c
R13: 04a17b4203d90165 R14: 0000000000401bc0 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..