RBP: 00007f19326aa1d0 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffeea19aebf R14: 00007f19326aa300 R15: 0000000000022000
Bluetooth: hci2 command 0x0409 tx timeout
==================================================================
BUG: KASAN: use-after-free in put_pid_ns+0xf6/0x110 kernel/pid_namespace.c:202
Read of size 8 at addr ffff88804a3c7190 by task syz-executor.4/20568

CPU: 0 PID: 20568 Comm: syz-executor.4 Not tainted 4.14.228-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
 put_pid_ns+0xf6/0x110 kernel/pid_namespace.c:202
 free_nsproxy+0xf7/0x1f0 kernel/nsproxy.c:182
 switch_task_namespaces+0x8f/0xb0 kernel/nsproxy.c:229
 copy_process.part.0+0x4118/0x71c0 kernel/fork.c:1992
 copy_process kernel/fork.c:1605 [inline]
 _do_fork+0x184/0xc80 kernel/fork.c:2091
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x466459
RSP: 002b:00007f19326aa188 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 000000000056c158 RCX: 0000000000466459
RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000020120580
RBP: 00007f19326aa1d0 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffeea19aebf R14: 00007f19326aa300 R15: 0000000000022000

Allocated by task 20568:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 kmem_cache_alloc+0x124/0x3c0 mm/slab.c:3552
 kmem_cache_zalloc include/linux/slab.h:651 [inline]
 create_pid_namespace kernel/pid_namespace.c:116 [inline]
 copy_pid_ns+0x1b2/0xa60 kernel/pid_namespace.c:186
 create_new_namespaces+0x25f/0x720 kernel/nsproxy.c:94
 copy_namespaces+0x27b/0x310 kernel/nsproxy.c:165
 copy_process.part.0+0x25f8/0x71c0 kernel/fork.c:1793
 copy_process kernel/fork.c:1605 [inline]
 _do_fork+0x184/0xc80 kernel/fork.c:2091
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 17:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kmem_cache_free+0x7c/0x2b0 mm/slab.c:3758
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2699 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline]
 rcu_process_callbacks+0x780/0x1180 kernel/rcu/tree.c:2946
 __do_softirq+0x24d/0x9ff kernel/softirq.c:288

The buggy address belongs to the object at ffff88804a3c6958
 which belongs to the cache pid_namespace of size 2264
The buggy address is located 2104 bytes inside of
 2264-byte region [ffff88804a3c6958, ffff88804a3c7230)
The buggy address belongs to the page:
page:ffffea000128f180 count:1 mapcount:0 mapping:ffff88804a3c6000 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffff88804a3c6000 0000000000000000 0000000100000003
raw: ffffea000136d620 ffff8880b1063748 ffff88823a25ac40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88804a3c7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88804a3c7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88804a3c7180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff88804a3c7200: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
 ffff88804a3c7280: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00
==================================================================