WARNING: CPU: 0 PID: 3086 at mm/slab_common.c:1009 kmalloc_slab+0x5d/0x70 mm/slab_common.c:1009
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 3086 Comm: syzkaller196778 Not tainted 4.15.0-rc1-next-20171201+ #57
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+0x194/0x257 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:177
 fixup_bug arch/x86/kernel/traps.c:246 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1066
RIP: 0010:kmalloc_slab+0x5d/0x70 mm/slab_common.c:1009
RSP: 0018:ffff8801cbebf678 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801cb99b180 RCX: ffffffff8171fa47
RDX: 1ffff1003974a74a RSI: 0000000000000000 RDI: 0000000007b81000
RBP: ffff8801cbebf678 R08: 1ffff100397d7e46 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801cba53a50
R13: 0000000000000000 R14: 00000000014000c0 R15: ffffffff85bebae0
 __do_kmalloc mm/slab.c:3707 [inline]
 __kmalloc+0x25/0x760 mm/slab.c:3721
 kmalloc include/linux/slab.h:521 [inline]
 relay_create_buf kernel/relay.c:172 [inline]
 relay_open_buf.part.10+0xc8/0x9b0 kernel/relay.c:449
 relay_open_buf kernel/relay.c:446 [inline]
 relay_open+0x57a/0xa40 kernel/relay.c:596
 do_blk_trace_setup+0x4a4/0xcd0 kernel/trace/blktrace.c:544
 __blk_trace_setup+0xb6/0x140 kernel/trace/blktrace.c:589
 blk_trace_ioctl+0x1d5/0x2a0 kernel/trace/blktrace.c:728
 blkdev_ioctl+0x1845/0x1e00 block/ioctl.c:587
 block_ioctl+0xea/0x130 fs/block_dev.c:1860
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x443e59
RSP: 002b:00007ffed631b268 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443e59
RDX: 0000000020ed6000 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00000000006ce018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000401b40
R13: 0000000000401bd0 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..