------------[ cut here ]------------ refcount_t: increment on 0; use-after-free. WARNING: CPU: 0 PID: 8679 at lib/refcount.c:156 refcount_inc_checked lib/refcount.c:156 [inline] WARNING: CPU: 0 PID: 8679 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: 8679 Comm: syz-executor.5 Not tainted 5.2.0-rc3-next-20190606 #10 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 60 33 68 06 31 ff 89 de e8 db c3 3b fe 84 db 75 dd e8 92 c2 3b fe 48 c7 c7 60 b7 c4 87 c6 05 40 33 68 06 01 e8 8d f4 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:ffff88820eed75e8 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000040000 RSI: ffffffff815aeaf6 RDI: ffffed1041ddaeaf RBP: ffff88820eed75f8 R08: ffff888056350700 R09: ffffed1015d040f1 R10: ffffed1015d040f0 R11: ffff8880ae820787 R12: ffff8880995ed018 R13: ffff88820eed76c0 R14: ffff8880995ecff8 R15: 1ffff11041ddaec8 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 include/linux/gfp.h:473 [inline] __alloc_pages_node include/linux/gfp.h:486 [inline] alloc_pages_node include/linux/gfp.h:500 [inline] alloc_thread_stack_node kernel/fork.c:248 [inline] dup_task_struct kernel/fork.c:852 [inline] copy_process.part.0+0x483/0x6720 kernel/fork.c:1896 copy_process kernel/fork.c:1828 [inline] _do_fork+0x25d/0xfe0 kernel/fork.c:2394 __do_sys_clone kernel/fork.c:2501 [inline] __se_sys_clone kernel/fork.c:2495 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2495 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd8a70ebc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459279 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000020002100 RBP: 000000000075bfc0 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd8a70ec6d4 R13: 00000000004bf6c2 R14: 00000000004d0b38 R15: 00000000ffffffff Shutting down cpus with NMI Kernel Offset: disabled Rebooting in 86400 seconds..