[info] Using makefile-style concurrent boot in runlevel 2.
[....] Starting enhanced syslogd: rsyslogd[   10.792107] rsyslogd (2854) used greatest stack depth: 15872 bytes left
[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

Warning: Permanently added 'ci-upstream-mmots-kasan-gce-4,10.128.0.19' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   53.317675] ------------[ cut here ]------------
[   53.322474] WARNING: CPU: 1 PID: 2981 at mm/slab_common.c:1001 kmalloc_slab+0x5d/0x70
[   53.330612] Kernel panic - not syncing: panic_on_warn set ...
[   53.330612] 
[   53.337954] CPU: 1 PID: 2981 Comm: syzkaller726348 Not tainted 4.14.0-rc4-mm1+ #16
[   53.345631] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   53.354955] Call Trace:
[   53.357514]  dump_stack+0x194/0x257
[   53.361116]  ? arch_local_irq_restore+0x53/0x53
[   53.365769]  panic+0x1e4/0x41c
[   53.368934]  ? refcount_error_report+0x214/0x214
[   53.373662]  ? show_regs_print_info+0x65/0x65
[   53.378143]  ? kmalloc_slab+0x5d/0x70
[   53.381914]  __warn+0x1c4/0x1e0
[   53.385163]  ? kmalloc_slab+0x5d/0x70
[   53.388938]  report_bug+0x211/0x2d0
[   53.392541]  fixup_bug+0x40/0x90
[   53.395878]  do_trap+0x260/0x390
[   53.399224]  do_error_trap+0x120/0x390
[   53.403097]  ? do_trap+0x390/0x390
[   53.406619]  ? kmalloc_slab+0x5d/0x70
[   53.410403]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   53.415221]  do_invalid_op+0x1b/0x20
[   53.418906]  invalid_op+0x18/0x20
[   53.422334] RIP: 0010:kmalloc_slab+0x5d/0x70
[   53.426709] RSP: 0018:ffff8801ce01f4b0 EFLAGS: 00010246
[   53.432049] RAX: 0000000000000000 RBX: ffff8801ce01f748 RCX: 0000000000000007
[   53.439291] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffffff8801
[   53.446530] RBP: ffff8801ce01f4b0 R08: ffff8801d55221c0 R09: ffff8801ce01fb10
[   53.453768] R10: ffff8801ce34c5c0 R11: 0000000000000000 R12: ffff8801ce01fab0
[   53.461007] R13: ffff8801ce01fb10 R14: 00000000014080c0 R15: ffff8801cd90c7c0
[   53.468267]  __kmalloc+0x25/0x760
[   53.471696]  ? inet6_dump_ifaddr+0x30/0x30
[   53.475901]  ? ip6_setup_cork+0x1e8/0x15c0
[   53.480109]  ip6_setup_cork+0x1e8/0x15c0
[   53.484146]  ? __ip6_append_data.isra.43+0x3340/0x3340
[   53.489403]  ip6_make_skb+0x282/0x530
[   53.493176]  ? ip_reply_glue_bits+0xb0/0xb0
[   53.497470]  ? ip6_push_pending_frames+0xe0/0xe0
[   53.502196]  ? ip6_dst_hoplimit+0x10d/0x420
[   53.506487]  ? ip6_route_output_flags+0x1f1/0x2b0
[   53.511314]  ? __lock_is_held+0xbc/0x140
[   53.515357]  ? ip6_dst_hoplimit+0xc1/0x420
[   53.519560]  ? ip6_find_1stfragopt+0x240/0x240
[   53.524121]  udpv6_sendmsg+0x2769/0x3380
[   53.528156]  ? ip_reply_glue_bits+0xb0/0xb0
[   53.532464]  ? udpv6_setsockopt+0x80/0x80
[   53.536579]  ? find_held_lock+0x39/0x1d0
[   53.540620]  ? lock_downgrade+0x990/0x990
[   53.544740]  ? lock_downgrade+0x990/0x990
[   53.548857]  ? lock_release+0xd70/0xd70
[   53.552812]  ? do_raw_spin_trylock+0x190/0x190
[   53.557367]  ? __local_bh_enable_ip+0x9d/0x160
[   53.561921]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   53.566906]  ? release_sock+0x1d4/0x2a0
[   53.570855]  ? _raw_spin_unlock_bh+0x30/0x40
[   53.575235]  ? release_sock+0x1d4/0x2a0
[   53.579190]  ? udp_v6_get_port+0x9c/0xc0
[   53.583229]  inet_sendmsg+0x11f/0x5e0
[   53.587000]  ? inet_sendmsg+0x11f/0x5e0
[   53.590943]  ? __might_sleep+0x95/0x190
[   53.594889]  ? inet_recvmsg+0x5f0/0x5f0
[   53.598836]  ? selinux_socket_sendmsg+0x36/0x40
[   53.603474]  ? security_socket_sendmsg+0x89/0xb0
[   53.608197]  ? inet_recvmsg+0x5f0/0x5f0
[   53.612142]  sock_sendmsg+0xca/0x110
[   53.615827]  SYSC_sendto+0x358/0x5a0
[   53.619515]  ? SYSC_connect+0x480/0x480
[   53.623475]  ? mm_fault_error+0x2c0/0x2c0
[   53.627598]  ? ipv6_setsockopt+0xa8/0x150
[   53.631724]  ? __do_page_fault+0xd60/0xd60
[   53.635944]  ? lockdep_sys_exit+0x47/0xf0
[   53.640060]  ? entry_SYSCALL_64_fastpath+0x5/0xbe
[   53.644876]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   53.649864]  SyS_sendto+0x40/0x50
[   53.653293]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   53.658021] RIP: 0033:0x43fea9
[   53.661180] RSP: 002b:00007ffdf3b88968 EFLAGS: 00000217 ORIG_RAX: 000000000000002c
[   53.668874] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 000000000043fea9
[   53.676115] RDX: 0000000000000000 RSI: 000000002052bfcc RDI: 0000000000000003
[   53.683354] RBP: 0000000000000082 R08: 0000000020e0afe4 R09: 000000000000001c
[   53.690594] R10: 0000000000000000 R11: 0000000000000217 R12: 04a17b4203d90165
[   53.697832] R13: 0100000000000000 R14: 0000000000000000 R15: 0000000000000000
[   53.705545] Dumping ftrace buffer:
[   53.709096]    (ftrace buffer empty)
[   53.712776] Kernel Offset: disabled
[   53.716379] Rebooting in 86400 seconds..