executing program
syzkaller login: [   17.515693] ------------[ cut here ]------------
[   17.516072] WARNING: CPU: 3 PID: 2977 at mm/slab_common.c:1001 kmalloc_slab+0x5d/0x70
[   17.516538] Kernel panic - not syncing: panic_on_warn set ...
[   17.516538] 
[   17.516980] CPU: 3 PID: 2977 Comm: syzkaller476558 Not tainted 4.14.0-rc5-next-20171018+ #8
[   17.517762] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   17.518355] Call Trace:
[   17.518557]  dump_stack+0x194/0x257
[   17.518851]  ? arch_local_irq_restore+0x53/0x53
[   17.519218]  ? vsnprintf+0x1ed/0x1900
[   17.519503]  panic+0x1e4/0x41c
[   17.519765]  ? refcount_error_report+0x214/0x214
[   17.520116]  ? show_regs_print_info+0x65/0x65
[   17.520442]  ? __warn+0x1a9/0x1e0
[   17.520725]  ? kmalloc_slab+0x5d/0x70
[   17.521008]  __warn+0x1c4/0x1e0
[   17.521259]  ? kmalloc_slab+0x5d/0x70
[   17.521539]  report_bug+0x211/0x2d0
[   17.521822]  fixup_bug+0x40/0x90
[   17.522077]  do_trap+0x260/0x390
[   17.522328]  do_error_trap+0x120/0x390
[   17.522648]  ? do_trap+0x390/0x390
[   17.523384]  ? kmalloc_slab+0x5d/0x70
[   17.523694]  ? __lock_is_held+0xb6/0x140
[   17.523972]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   17.524313]  do_invalid_op+0x1b/0x20
[   17.524575]  invalid_op+0x18/0x20
[   17.524802] RIP: 0010:kmalloc_slab+0x5d/0x70
[   17.525104] RSP: 0018:ffff88003846f670 EFLAGS: 00010246
[   17.525456] RAX: 0000000000000000 RBX: ffff88006d05a000 RCX: ffffffff81707d57
[   17.525941] RDX: 1ffff1000d227cba RSI: 0000000000000000 RDI: 0000000000d00000
[   17.526427] RBP: ffff88003846f670 R08: 0000000000000001 R09: 0000000000000000
[   17.526932] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88006913e5d0
[   17.527575] R13: 0000000000000000 R14: 00000000014000c0 R15: ffffffff85977aa0
[   17.528316]  ? relay_open_buf.part.10+0x97/0x9b0
[   17.528668]  __kmalloc+0x25/0x760
[   17.528910]  ? kmem_cache_alloc_trace+0x456/0x750
[   17.529262]  ? relay_open_buf.part.10+0xc8/0x9b0
[   17.529611]  relay_open_buf.part.10+0xc8/0x9b0
[   17.529932]  ? find_next_bit+0x27/0x30
[   17.530318]  relay_open+0x57a/0xa40
[   17.530706]  ? relay_open_buf.part.10+0x9b0/0x9b0
[   17.531107]  ? __debugfs_create_file+0x2cc/0x3e0
[   17.531494]  ? debugfs_create_file+0x57/0x70
[   17.531855]  do_blk_trace_setup+0x4a4/0xcf0
[   17.532234]  ? blk_tracer_print_line+0x40/0x40
[   17.532588]  ? __might_sleep+0x95/0x190
[   17.532928]  ? kasan_check_write+0x14/0x20
[   17.533262]  ? _copy_from_user+0x99/0x110
[   17.533564]  blk_trace_setup+0xbd/0x180
[   17.533843]  ? do_blk_trace_setup+0xcf0/0xcf0
[   17.534231]  ? disk_name+0x98/0x100
[   17.534513]  blk_trace_ioctl+0x1ab/0x2d0
[   17.534879]  ? blk_add_trace_rq_remap+0x600/0x600
[   17.535254]  ? avc_has_extended_perms+0x7fa/0x12c0
[   17.535619]  blkdev_ioctl+0x8e6/0x1de0
[   17.535960]  ? blkpg_ioctl+0xb20/0xb20
[   17.536263]  ? avc_ss_reset+0x110/0x110
[   17.536652]  ? __do_page_fault+0x64c/0xd60
[   17.536948]  ? lock_downgrade+0x990/0x990
[   17.537257]  ? handle_mm_fault+0x410/0x8d0
[   17.537581]  ? down_read_trylock+0xdb/0x170
[   17.537940]  ? __do_page_fault+0x31e/0xd60
[   17.538328]  ? trace_event_raw_event_sched_switch+0x8a0/0x8a0
[   17.538758]  ? __do_page_fault+0x3d6/0xd60
[   17.539082]  ? rcu_note_context_switch+0x710/0x710
[   17.539508]  block_ioctl+0xde/0x120
[   17.539884]  ? blkdev_fallocate+0x3b0/0x3b0
[   17.540231]  do_vfs_ioctl+0x1b1/0x1520
[   17.540506]  ? _cond_resched+0x14/0x30
[   17.540795]  ? ioctl_preallocate+0x2b0/0x2b0
[   17.541187]  ? selinux_capable+0x40/0x40
[   17.541522]  ? putname+0xf3/0x130
[   17.541808]  ? do_sys_open+0x320/0x6d0
[   17.542098]  ? security_file_ioctl+0x89/0xb0
[   17.542410]  SyS_ioctl+0x8f/0xc0
[   17.542675]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   17.543045] RIP: 0033:0x4390c9
[   17.543339] RSP: 002b:00007ffdeb4ccc78 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
[   17.543959] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004390c9
[   17.544557] RDX: 0000000020ed6000 RSI: 00000000c0481273 RDI: 0000000000000003
[   17.545153] RBP: 0000000000000082 R08: 00000000000000fe R09: 0000000000000000
[   17.545649] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   17.546242] R13: 0000000000401d20 R14: 0000000000401db0 R15: 0000000000000000
[   17.546910] Dumping ftrace buffer:
[   17.547292]    (ftrace buffer empty)
[   17.547552] Kernel Offset: disabled
[   17.547822] Rebooting in 86400 seconds..