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BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x169f/0x1810 arch/x86/kernel/unwind_orc.c:470
Read of size 8 at addr ffff88819da2f800 by task syz-executor.0/10314

CPU: 0 PID: 10314 Comm: syz-executor.0 Not tainted 4.14.156-syzkaller #0
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xe5/0x154 lib/dump_stack.c:58
 print_address_description+0x60/0x226 mm/kasan/report.c:187
 __kasan_report.cold+0x1a/0x41 mm/kasan/report.c:316
 unwind_next_frame+0x169f/0x1810 arch/x86/kernel/unwind_orc.c:470
 perf_callchain_kernel+0x3a0/0x540 arch/x86/events/core.c:2338
 get_perf_callchain+0x2f5/0x770 kernel/events/callchain.c:217
 perf_callchain+0x147/0x190 kernel/events/callchain.c:190
 perf_prepare_sample+0x6a8/0x1360 kernel/events/core.c:6149
 __perf_event_output kernel/events/core.c:6265 [inline]
 perf_event_output_forward+0xdc/0x220 kernel/events/core.c:6283
 __perf_event_overflow+0x12d/0x340 kernel/events/core.c:7541
 perf_swevent_overflow+0x7a/0xf0 kernel/events/core.c:7617
 perf_swevent_event+0x19c/0x270 kernel/events/core.c:7650
 perf_tp_event+0x633/0x7f0 kernel/events/core.c:8079
 perf_trace_run_bpf_submit kernel/events/core.c:8049 [inline]
 perf_trace_run_bpf_submit+0x113/0x170 kernel/events/core.c:8035
 perf_trace_lock_acquire+0x341/0x4e0 include/trace/events/lock.h:13
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x279/0x360 kernel/locking/lockdep.c:3993
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x42/0x60 kernel/locking/spinlock.c:160
 __debug_check_no_obj_freed lib/debugobjects.c:738 [inline]
 debug_check_no_obj_freed+0x148/0x5c0 lib/debugobjects.c:776
 slab_free_hook mm/slub.c:1404 [inline]
 slab_free_freelist_hook mm/slub.c:1458 [inline]
 slab_free mm/slub.c:3039 [inline]
 kmem_cache_free+0x1c2/0x3b0 mm/slub.c:3055
 ebitmap_destroy+0x75/0xe0 security/selinux/ss/ebitmap.c:338
 mls_context_destroy security/selinux/ss/context.h:109 [inline]
 context_destroy security/selinux/ss/context.h:148 [inline]
 security_sid_mls_copy+0x2bb/0x4f0 security/selinux/ss/services.c:2907
 selinux_socket_unix_stream_connect+0x2a3/0x3b0 security/selinux/hooks.c:4709
 security_unix_stream_connect+0x7c/0xb0 security/security.c:1336
 unix_stream_connect+0x6d1/0x1200 net/unix/af_unix.c:1319
 SYSC_connect net/socket.c:1655 [inline]
 SyS_connect+0x19b/0x280 net/socket.c:1636
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a679
RSP: 002b:00007efd69eb9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679
RDX: 0000000000000008 RSI: 0000000020985ff8 RDI: 0000000000000008
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007efd69eba6d4
R13: 00000000004bff14 R14: 00000000004d3dc8 R15: 00000000ffffffff

The buggy address belongs to the page:
page:ffffea0006768bc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000000()
raw: 4000000000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 ffffea0006768be0 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88819da2f700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88819da2f780: 00 00 00 00 00 00 00 f1 f1 f1 f1 f1 f1 04 f2 00
>ffff88819da2f800: f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00
                   ^
 ffff88819da2f880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88819da2f900: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f3 f3 f3
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