INIT: Entering runlevel: 2

[info] Using makefile-style concurrent boot in runlevel 2.
[....] Starting enhanced syslogd: rsyslogd[?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-next-kasan-gce-0,10.128.0.62' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   47.408609] WARNING: CPU: 0 PID: 3086 at mm/slab_common.c:1009 kmalloc_slab+0x5d/0x70
[   47.409823] Kernel panic - not syncing: panic_on_warn set ...
[   47.409823] 
[   47.410794] CPU: 0 PID: 3086 Comm: syzkaller196778 Not tainted 4.15.0-rc1-next-20171201+ #57
[   47.411931] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.413168] Call Trace:
[   47.413529]  dump_stack+0x194/0x257
[   47.414022]  ? arch_local_irq_restore+0x53/0x53
[   47.414650]  ? vsnprintf+0x1ed/0x1900
[   47.415179]  panic+0x1e4/0x41c
[   47.415631]  ? refcount_error_report+0x214/0x214
[   47.416265]  ? show_regs_print_info+0x65/0x65
[   47.416870]  ? _raw_spin_unlock_irqrestore+0x31/0xba
[   47.417551]  ? __warn+0x1c1/0x200
[   47.418021]  ? kmalloc_slab+0x5d/0x70
[   47.418532]  __warn+0x1dc/0x200
[   47.418976]  ? kmalloc_slab+0x5d/0x70
[   47.419489]  report_bug+0x211/0x2d0
[   47.419987]  fixup_bug.part.11+0x37/0x80
[   47.420533]  do_error_trap+0x2d7/0x3e0
[   47.421056]  ? entry_SYSCALL_64_fastpath+0x1f/0x96
[   47.421734]  ? find_held_lock+0x39/0x1d0
[   47.422281]  ? math_error+0x400/0x400
[   47.422806]  ? check_noncircular+0x20/0x20
[   47.423391]  ? print_usage_bug+0x3f0/0x3f0
[   47.423964]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   47.424615]  do_invalid_op+0x1b/0x20
[   47.425115]  invalid_op+0x22/0x40
[   47.425595] RIP: 0010:kmalloc_slab+0x5d/0x70
[   47.426183] RSP: 0018:ffff8801cbebf678 EFLAGS: 00010246
[   47.426908] RAX: 0000000000000000 RBX: ffff8801cb99b180 RCX: ffffffff8171fa47
[   47.427862] RDX: 1ffff1003974a74a RSI: 0000000000000000 RDI: 0000000007b81000
[   47.429311] RBP: ffff8801cbebf678 R08: 1ffff100397d7e46 R09: 0000000000000000
[   47.436550] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801cba53a50
[   47.443792] R13: 0000000000000000 R14: 00000000014000c0 R15: ffffffff85bebae0
[   47.451304]  ? relay_open_buf.part.10+0x97/0x9b0
[   47.456032]  ? rcu_read_lock_sched_held+0x108/0x120
[   47.461019]  __kmalloc+0x25/0x760
[   47.464443]  ? kmem_cache_alloc_trace+0x459/0x750
[   47.469256]  ? relay_open_buf.part.10+0xc8/0x9b0
[   47.473985]  relay_open_buf.part.10+0xc8/0x9b0
[   47.478545]  relay_open+0x57a/0xa40
[   47.482143]  ? relay_open_buf.part.10+0x9b0/0x9b0
[   47.486956]  ? __debugfs_create_file+0x2cf/0x3d0
[   47.491687]  ? debugfs_create_file+0x57/0x70
[   47.496067]  do_blk_trace_setup+0x4a4/0xcd0
[   47.500359]  ? blk_tracer_print_line+0x40/0x40
[   47.504920]  ? __might_sleep+0x95/0x190
[   47.508883]  ? kasan_check_write+0x14/0x20
[   47.513089]  ? _copy_from_user+0x99/0x110
[   47.517207]  __blk_trace_setup+0xb6/0x140
[   47.521325]  ? do_blk_trace_setup+0xcd0/0xcd0
[   47.525796]  ? disk_name+0x98/0x100
[   47.529744]  blk_trace_ioctl+0x1d5/0x2a0
[   47.533776]  ? blk_add_trace_rq_remap+0x680/0x680
[   47.538593]  ? avc_has_extended_perms+0x7fa/0x12c0
[   47.543496]  blkdev_ioctl+0x1845/0x1e00
[   47.547440]  ? blkpg_ioctl+0xb20/0xb20
[   47.551297]  ? avc_ss_reset+0x110/0x110
[   47.555250]  ? lock_downgrade+0x980/0x980
[   47.559384]  ? down_read_trylock+0xdb/0x170
[   47.563689]  ? trace_event_raw_event_sched_switch+0x800/0x800
[   47.569545]  ? up_read+0x1a/0x40
[   47.572892]  ? rcu_note_context_switch+0x710/0x710
[   47.577808]  block_ioctl+0xea/0x130
[   47.581408]  ? blkdev_fallocate+0x3b0/0x3b0
[   47.585702]  do_vfs_ioctl+0x1b1/0x1530
[   47.589558]  ? _cond_resched+0x14/0x30
[   47.593420]  ? ioctl_preallocate+0x2b0/0x2b0
[   47.597802]  ? selinux_capable+0x40/0x40
[   47.601833]  ? putname+0xf3/0x130
[   47.605257]  ? do_sys_open+0x320/0x6d0
[   47.609120]  ? security_file_ioctl+0x89/0xb0
[   47.613500]  SyS_ioctl+0x8f/0xc0
[   47.616841]  entry_SYSCALL_64_fastpath+0x1f/0x96
[   47.621566] RIP: 0033:0x443e59
[   47.624722] RSP: 002b:00007ffed631b268 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
[   47.632397] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443e59
[   47.639633] RDX: 0000000020ed6000 RSI: 00000000c0481273 RDI: 0000000000000003
[   47.646874] RBP: 00000000006ce018 R08: 0000000000000000 R09: 0000000000000000
[   47.654111] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000401b40
[   47.661346] R13: 0000000000401bd0 R14: 0000000000000000 R15: 0000000000000000
[   47.668800] Dumping ftrace buffer:
[   47.672369]    (ftrace buffer empty)
[   47.676049] Kernel Offset: disabled
[   47.679647] Rebooting in 86400 seconds..