syzbot

------------[ cut here ]------------
WARNING: CPU: 1 PID: 3761 at mm/page_alloc.c:3544 __alloc_pages_slowpath+0x1389/0x1e30 mm/page_alloc.c:3544
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3761 Comm: syzkaller750322 Not tainted 4.9.93-gf6bec4e #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801b46a73c0 ffffffff81d9c299 ffffffff83a48420 00000000ffffffff
 0000000000000000 0000000000000001 0000000000000dd8 ffff8801b46a7480
 ffffffff8141f825 0000000041b58ab3 ffffffff8419bdb0 ffffffff8141f666
Call Trace:
 [<ffffffff81d9c299>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d9c299>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8141f825>] panic+0x1bf/0x3bc kernel/panic.c:179
 [<ffffffff8141fb11>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff811344bc>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff81451879>] __alloc_pages_slowpath+0x1389/0x1e30 mm/page_alloc.c:3544
 [<ffffffff81452674>] __alloc_pages_nodemask+0x354/0x700 mm/page_alloc.c:3851
 [<ffffffff814a452a>] __alloc_pages include/linux/gfp.h:433 [inline]
 [<ffffffff814a452a>] __alloc_pages_node include/linux/gfp.h:446 [inline]
 [<ffffffff814a452a>] alloc_pages_node include/linux/gfp.h:460 [inline]
 [<ffffffff814a452a>] kmalloc_order+0x2a/0x70 mm/slab_common.c:1043
 [<ffffffff814a458f>] kmalloc_order_trace+0x1f/0x190 mm/slab_common.c:1054
 [<ffffffff81534ce4>] kmalloc_large include/linux/slab.h:422 [inline]
 [<ffffffff81534ce4>] __kmalloc+0x194/0x300 mm/slub.c:3730
 [<ffffffff8136d73b>] kmalloc include/linux/slab.h:495 [inline]
 [<ffffffff8136d73b>] relay_create_buf kernel/relay.c:172 [inline]
 [<ffffffff8136d73b>] relay_open_buf.part.15+0xcb/0xa30 kernel/relay.c:449
 [<ffffffff8136e74f>] relay_open_buf kernel/relay.c:446 [inline]
 [<ffffffff8136e74f>] relay_open+0x4df/0x860 kernel/relay.c:596
 [<ffffffff813b03af>] do_blk_trace_setup+0x3df/0x960 kernel/trace/blktrace.c:517
 [<ffffffff813b0a10>] blk_trace_setup+0xe0/0x1a0 kernel/trace/blktrace.c:560
 [<ffffffff813b0e38>] blk_trace_ioctl+0x168/0x2b0 kernel/trace/blktrace.c:669
 [<ffffffff81d3fde5>] blkdev_ioctl+0x6c5/0x1a70 block/ioctl.c:576
 [<ffffffff8163019e>] block_ioctl+0xde/0x120 fs/block_dev.c:1688
 [<ffffffff815b047c>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815b047c>] file_ioctl fs/ioctl.c:493 [inline]
 [<ffffffff815b047c>] do_vfs_ioctl+0x1ac/0x1150 fs/ioctl.c:677
 [<ffffffff815b14af>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815b14af>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff838d5953>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..