executing program
syzkaller login: [   28.524086] ------------[ cut here ]------------
[   28.524700] WARNING: CPU: 3 PID: 2987 at lib/idr.c:157 idr_replace+0x1d8/0x240
[   28.532434] Kernel panic - not syncing: panic_on_warn set ...
[   28.532434] 
[   28.534186] CPU: 3 PID: 2987 Comm: syzkaller153736 Not tainted 4.13.0-rc7-next-20170829+ #11
[   28.540048] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   28.546298] Call Trace:
[   28.546587]  dump_stack+0x194/0x257
[   28.546993]  ? arch_local_irq_restore+0x53/0x53
[   28.547886]  panic+0x1e4/0x41c
[   28.548246]  ? refcount_error_report+0x214/0x214
[   28.548688]  ? show_regs_print_info+0x65/0x65
[   28.549010]  ? retint_kernel+0x10/0x10
[   28.549288]  ? idr_replace+0x1d8/0x240
[   28.549557]  __warn+0x1c4/0x1e0
[   28.549817]  ? idr_replace+0x1da/0x240
[   28.550130]  ? idr_replace+0x1d8/0x240
[   28.550404]  report_bug+0x211/0x2d0
[   28.550675]  fixup_bug+0x40/0x90
[   28.550913]  do_trap+0x260/0x390
[   28.555892]  do_error_trap+0x120/0x390
[   28.556356]  ? lru_cache_add_file+0x20/0x20
[   28.556822]  ? do_trap+0x390/0x390
[   28.557278]  ? idr_replace+0x1d8/0x240
[   28.557700]  ? check_noncircular+0x20/0x20
[   28.558215]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   28.558791]  do_invalid_op+0x1b/0x20
[   28.559269]  invalid_op+0x18/0x20
[   28.559710] RIP: 0010:idr_replace+0x1d8/0x240
[   28.560259] RSP: 0018:ffff88003cfdf9f8 EFLAGS: 00010297
[   28.560896] RAX: ffff88003b5302c0 RBX: 1ffff100079fbf43 RCX: 0000000000000000
[   28.561752] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88003cfdfa78
[   28.562623] RBP: ffff88003cfdfae0 R08: ffff88003cfdf440 R09: ffff88003cfdf438
[   28.563521] R10: ffff88003cfdf3b0 R11: 1ffff100076a62eb R12: ffffffffffffffff
[   28.564387] R13: ffff88003cfdfab8 R14: dffffc0000000000 R15: ffff88003cfdfbc8
[   28.565275]  ? idr_replace+0x1d8/0x240
[   28.565880]  ? idr_for_each+0x3a0/0x3a0
[   28.566357]  drm_gem_handle_delete+0x33/0xa0
[   28.566871]  drm_gem_close_ioctl+0xa1/0xe0
[   28.567382]  drm_ioctl_kernel+0x1e7/0x2e0
[   28.567862]  ? drm_gem_handle_create+0x60/0x60
[   28.568721]  ? drm_ioctl_permit+0x2b0/0x2b0
[   28.569215]  ? kasan_check_write+0x14/0x20
[   28.569709]  ? _copy_from_user+0x99/0x110
[   28.570188]  drm_ioctl+0x72e/0xa50
[   28.570667]  ? drm_gem_handle_create+0x60/0x60
[   28.571229]  ? drm_getstats+0x30/0x30
[   28.571684]  ? check_same_owner+0x320/0x320
[   28.572170]  ? __handle_mm_fault+0x39c0/0x39c0
[   28.576820]  ? vmacache_find+0x61/0x270
[   28.584317]  ? rcu_note_context_switch+0x710/0x710
[   28.584925]  ? drm_getstats+0x30/0x30
[   28.585374]  do_vfs_ioctl+0x1b1/0x1530
[   28.585816]  ? _cond_resched+0x14/0x30
[   28.586539]  ? ioctl_preallocate+0x2b0/0x2b0
[   28.587361]  ? selinux_capable+0x40/0x40
[   28.587850]  ? putname+0xf3/0x130
[   28.588227]  ? do_sys_open+0x320/0x6d0
[   28.588682]  ? security_file_ioctl+0x7d/0xb0
[   28.589113]  ? security_file_ioctl+0x89/0xb0
[   28.590041]  SyS_ioctl+0x8f/0xc0
[   28.590365]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   28.591133] RIP: 0033:0x439049
[   28.591750] RSP: 002b:00007ffd85467bc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   28.593389] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000439049
[   28.594932] RDX: 0000000020001000 RSI: 0000000040086409 RDI: 0000000000000003
[   28.596134] RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
[   28.597061] R10: 00000000000000fd R11: 0000000000000246 R12: 0000000000000000
[   28.597837] R13: 0000000000401ca0 R14: 0000000000401d30 R15: 0000000000000000
[   28.598915] Dumping ftrace buffer:
[   28.599662]    (ftrace buffer empty)
[   28.600110] Kernel Offset: disabled
[   28.600495] Rebooting in 86400 seconds..