------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 0 PID: 8036 at lib/refcount.c:156 refcount_inc_checked lib/refcount.c:156 [inline]
WARNING: CPU: 0 PID: 8036 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: 8036 Comm: syz-executor.2 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: 0000:ffff88806671f348 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff815aeaf6 RDI: ffffed100cce3e5b
RBP: ffff88806671f358 R08: ffff88808e6b0040 R09: ffffed1015d040f1
R10: ffffed1015d040f0 R11: ffff8880ae820787 R12: ffff88809a8f7d58
R13: ffff88806671f420 R14: ffff88809a8f7d38 R15: 1ffff1100cce3e74
 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
 mem_cgroup_try_charge+0x24d/0x5e0 mm/memcontrol.c:6073
 mem_cgroup_try_charge_delay+0x1f/0xa0 mm/memcontrol.c:6088
 shmem_getpage_gfp+0x69e/0x2500 mm/shmem.c:1854
 shmem_getpage mm/shmem.c:139 [inline]
 shmem_fallocate+0x609/0xc60 mm/shmem.c:2788
 vfs_fallocate+0x4aa/0xa50 fs/open.c:309
 ioctl_preallocate+0x197/0x210 fs/ioctl.c:490
 file_ioctl fs/ioctl.c:506 [inline]
 do_vfs_ioctl+0x11c7/0x13e0 fs/ioctl.c:696
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 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:00007f2556ffdc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279
RDX: 0000000020000000 RSI: 0000000040305828 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2556ffe6d4
R13: 00000000004c19b4 R14: 00000000004d4710 R15: 00000000ffffffff
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..