------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 0 PID: 18466 at lib/refcount.c:156 refcount_inc_checked lib/refcount.c:156 [inline]
WARNING: CPU: 0 PID: 18466 at lib/refcount.c:156 refcount_inc_checked+0x61/0x70 lib/refcount.c:154
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 18466 Comm: syz-executor.5 Not tainted 5.2.0-rc3-next-20190607 #11
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x2cb/0x744 kernel/panic.c:219
 __warn.cold+0x20/0x4d kernel/panic.c:576
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:986
RIP: 0010:refcount_inc_checked lib/refcount.c:156 [inline]
RIP: 0010:refcount_inc_checked+0x61/0x70 lib/refcount.c:154
Code: 1d 20 38 68 06 31 ff 89 de e8 9b c7 3b fe 84 db 75 dd e8 52 c6 3b fe 48 c7 c7 60 b6 c4 87 c6 05 00 38 68 06 01 e8 4d f8 0d fe <0f> 0b eb c1 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 57 41
RSP: 0018:ffff8880877bf5f0 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815aeaf6 RDI: ffffed1010ef7eb0
RBP: ffff8880877bf600 R08: ffff88808d6d4140 R09: ffffed1015d040f1
R10: ffffed1015d040f0 R11: ffff8880ae820787 R12: ffff8880944e2698
R13: ffff8880877bf6c8 R14: ffff8880944e2678 R15: 1ffff11010ef7ec9
 css_task_iter_next+0x141/0x1f0 kernel/cgroup/cgroup.c:4572
 mem_cgroup_scan_tasks+0xbb/0x180 mm/memcontrol.c:1168
 select_bad_process mm/oom_kill.c:374 [inline]
 out_of_memory mm/oom_kill.c:1088 [inline]
 out_of_memory+0x6b2/0x1280 mm/oom_kill.c:1035
 mem_cgroup_out_of_memory+0x1ca/0x230 mm/memcontrol.c:1573
 mem_cgroup_oom mm/memcontrol.c:1905 [inline]
 try_charge+0xfbe/0x1480 mm/memcontrol.c:2468
 __memcg_kmem_charge_memcg+0x7c/0x130 mm/memcontrol.c:2775
 __memcg_kmem_charge+0x136/0x300 mm/memcontrol.c:2808
 __alloc_pages_nodemask+0x4bd/0x8d0 mm/page_alloc.c:4697
 alloc_pages_current+0x107/0x210 mm/mempolicy.c:2132
 alloc_pages include/linux/gfp.h:509 [inline]
 __pte_alloc_one include/asm-generic/pgalloc.h:63 [inline]
 pte_alloc_one+0x1b/0x1a0 arch/x86/mm/pgtable.c:26
 __pte_alloc+0x20/0x310 mm/memory.c:408
 do_anonymous_page mm/memory.c:3002 [inline]
 handle_pte_fault mm/memory.c:3890 [inline]
 __handle_mm_fault+0x3386/0x3eb0 mm/memory.c:4016
 handle_mm_fault+0x3b7/0xa90 mm/memory.c:4053
 do_user_addr_fault arch/x86/mm/fault.c:1455 [inline]
 __do_page_fault+0x5ef/0xda0 arch/x86/mm/fault.c:1521
 do_page_fault+0x71/0x57d arch/x86/mm/fault.c:1552
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1156
RIP: 0033:0x410bbf
Code: 0f 84 c8 02 00 00 48 83 bd 78 ff ff ff 00 0f 84 f9 04 00 00 48 8b 95 68 ff ff ff 44 89 95 38 ff ff ff 4c 8d ac 10 00 f7 ff ff <49> 89 85 90 06 00 00 49 8d 85 10 03 00 00 49 89 95 98 06 00 00 41
RSP: 002b:00007ffeb243d540 EFLAGS: 00010206
RAX: 00007f5ccc5c4000 RBX: 0000000000020000 RCX: 00000000004592ca
RDX: 0000000000021000 RSI: 0000000000021000 RDI: 0000000000000000
RBP: 00007ffeb243d620 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffeb243d710
R13: 00007f5ccc5e4700 R14: 0000000000000002 R15: 000000000075c06c
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..