Debian GNU/Linux 7 syzkaller ttyS0

executing program
syzkaller login: [   18.027592] ------------[ cut here ]------------
[   18.028044] WARNING: CPU: 3 PID: 2975 at mm/slab_common.c:1001 kmalloc_slab+0x5d/0x70
[   18.028694] Kernel panic - not syncing: panic_on_warn set ...
[   18.028694] 
[   18.029323] CPU: 3 PID: 2975 Comm: syzkaller794228 Not tainted 4.14.0-rc5-next-20171018+ #8
[   18.030042] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   18.030739] Call Trace:
[   18.030970]  dump_stack+0x194/0x257
[   18.031294]  ? arch_local_irq_restore+0x53/0x53
[   18.031708]  ? vsnprintf+0x1ed/0x1900
[   18.034019]  panic+0x1e4/0x41c
[   18.034308]  ? refcount_error_report+0x214/0x214
[   18.034720]  ? show_regs_print_info+0x65/0x65
[   18.035119]  ? __warn+0x1a9/0x1e0
[   18.035426]  ? kmalloc_slab+0x5d/0x70
[   18.035760]  __warn+0x1c4/0x1e0
[   18.036057]  ? kmalloc_slab+0x5d/0x70
[   18.036394]  report_bug+0x211/0x2d0
[   18.036718]  fixup_bug+0x40/0x90
[   18.037013]  do_trap+0x260/0x390
[   18.037342]  do_error_trap+0x120/0x390
[   18.037702]  ? do_trap+0x390/0x390
[   18.038028]  ? kmalloc_slab+0x5d/0x70
[   18.038365]  ? ipv6_dev_get_saddr+0x4ec/0x9f0
[   18.038756]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   18.039182]  do_invalid_op+0x1b/0x20
[   18.039519]  invalid_op+0x18/0x20
[   18.039906] RIP: 0010:kmalloc_slab+0x5d/0x70
[   18.040285] RSP: 0018:ffff88006dbc74b0 EFLAGS: 00010246
[   18.040746] RAX: 0000000000000000 RBX: ffff88006dbc7748 RCX: ffffffff843a9363
[   18.041380] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffffff8800
[   18.042004] RBP: ffff88006dbc74b0 R08: ffff88006984ee00 R09: ffff88006dbc7b10
[   18.042626] R10: ffff88006dbc7678 R11: 0000000000000000 R12: ffff88006dbc7ab0
[   18.043246] R13: ffff88006dbc7b10 R14: 00000000014080c0 R15: ffff8800683a4800
[   18.043939]  ? ip6_setup_cork+0x173/0x15c0
[   18.044315]  __kmalloc+0x25/0x760
[   18.044622]  ? inet6_dump_ifaddr+0x30/0x30
[   18.044990]  ? ip6_setup_cork+0x1e8/0x15c0
[   18.045365]  ip6_setup_cork+0x1e8/0x15c0
[   18.045727]  ? __ip6_append_data.isra.43+0x3340/0x3340
[   18.046244]  ? ip6_pol_route_output+0x4c/0x60
[   18.047149]  ? ip6_pol_route_input+0x70/0x70
[   18.047540]  ip6_make_skb+0x282/0x530
[   18.047882]  ? ip_reply_glue_bits+0xb0/0xb0
[   18.048262]  ? ip6_push_pending_frames+0xe0/0xe0
[   18.048673]  ? ip6_dst_hoplimit+0x26c/0x420
[   18.049048]  ? lock_downgrade+0x990/0x990
[   18.049420]  ? __lock_is_held+0xb6/0x140
[   18.049788]  ? ip6_dst_hoplimit+0xc1/0x420
[   18.050207]  ? ip6_find_1stfragopt+0x240/0x240
[   18.050616]  udpv6_sendmsg+0x2769/0x3380
[   18.050974]  ? ip_reply_glue_bits+0xb0/0xb0
[   18.051364]  ? udpv6_setsockopt+0x80/0x80
[   18.051727]  ? reacquire_held_locks+0x1fd/0x3d0
[   18.052124]  ? reacquire_held_locks+0x1fd/0x3d0
[   18.052535]  ? find_held_lock+0x35/0x1d0
[   18.052898]  ? release_sock+0x1d4/0x2a0
[   18.053242]  ? lock_downgrade+0x990/0x990
[   18.053590]  ? lock_downgrade+0x990/0x990
[   18.053939]  ? do_raw_spin_trylock+0x190/0x190
[   18.054327]  ? __local_bh_enable_ip+0x9d/0x160
[   18.054707]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   18.055121]  ? release_sock+0x1d4/0x2a0
[   18.055449]  ? _raw_spin_unlock_bh+0x30/0x40
[   18.055869]  ? release_sock+0x1d4/0x2a0
[   18.056241]  ? udp_v6_get_port+0x9c/0xc0
[   18.056606]  inet_sendmsg+0x11f/0x5e0
[   18.056939]  ? inet_sendmsg+0x11f/0x5e0
[   18.057285]  ? __might_sleep+0x95/0x190
[   18.057633]  ? inet_recvmsg+0x5f0/0x5f0
[   18.057980]  ? selinux_socket_sendmsg+0x36/0x40
[   18.058385]  ? security_socket_sendmsg+0x89/0xb0
[   18.058796]  ? inet_recvmsg+0x5f0/0x5f0
[   18.059144]  sock_sendmsg+0xca/0x110
[   18.059473]  SYSC_sendto+0x352/0x5a0
[   18.059801]  ? SYSC_connect+0x470/0x470
[   18.060204]  ? mm_fault_error+0x2c0/0x2c0
[   18.060590]  ? sock_common_setsockopt+0x95/0xd0
[   18.061007]  ? SyS_recv+0x40/0x40
[   18.061312]  ? entry_SYSCALL_64_fastpath+0x5/0xbe
[   18.061733]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   18.062170]  SyS_sendto+0x40/0x50
[   18.062478]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   18.062888] RIP: 0033:0x4351b9
[   18.063164] RSP: 002b:00007ffd32c36a18 EFLAGS: 00000217 ORIG_RAX: 000000000000002c
[   18.063874] RAX: ffffffffffffffda RBX: 00000000006c3a80 RCX: 00000000004351b9
[   18.064501] RDX: 0000000000000000 RSI: 000000002052bfcc RDI: 0000000000000006
[   18.065121] RBP: 0000000000000082 R08: 0000000020e0afe4 R09: 000000000000001c
[   18.065742] R10: 0000000000000000 R11: 0000000000000217 R12: 505daaef76b36d7c
[   18.066360] R13: 04a17b4203d90165 R14: 0000000000401bc0 R15: 0000000000000000
[   18.068189] Dumping ftrace buffer:
[   18.068596]    (ftrace buffer empty)
[   18.068916] Kernel Offset: disabled
[   18.069243] Rebooting in 86400 seconds..