cgroup: fork rejected by pids controller in /syz0
==================================================================
BUG: KASAN: stack-out-of-bounds in locks_remove_flock+0x33c/0x350 fs/locks.c:2567
Read of size 8 at addr ffff88019747f698 by task syz-executor0/11333

CPU: 0 PID: 11333 Comm: syz-executor0 Not tainted 4.20.0-rc1-next-20181107+ #107
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+0x244/0x39d lib/dump_stack.c:113
 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 locks_remove_flock+0x33c/0x350 fs/locks.c:2567
 locks_remove_file+0x148/0x5c0 fs/locks.c:2607
 __fput+0x2f0/0xa70 fs/file_table.c:271
 ____fput+0x15/0x20 fs/file_table.c:312
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 get_signal+0x1550/0x1970 kernel/signal.c:2347
 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: fd b3 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f30b90c7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
RAX: fffffffffffffe00 RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000001 RSI: 0000000020616fa0 RDI: 0000000000000005
RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f30b90c86d4
R13: 00000000004c3315 R14: 00000000004d5218 R15: 00000000ffffffff

The buggy address belongs to the page:
page:ffffea00065d1fc0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 ffffffff065d0101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88019747f580: f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88019747f600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88019747f680: 00 00 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00
kobject: 'phy10' (0000000087cff4d6): kobject_uevent_env
                            ^
 ffff88019747f700: 00 00 00 f1 f1 f1 f1 00 00 f2 f2 f2 f2 f2 f2 f8
 ffff88019747f780: f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 00 00 00 00 00
==================================================================
kobject: 'loop1' (0000000028832443): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'phy10' (0000000087cff4d6): fill_kobj_path: path = '/devices/virtual/mac80211_hwsim/hwsim10/ieee80211/phy10'
kobject: 'loop2' (00000000baeed8d7): kobject_uevent_env