WARNING: can't dereference registers at 00000000db5e1e54 for ip apic_timer_interrupt+0x8c/0xa0 arch/x86/entry/entry_64.S:792
netlink: 176 bytes leftover after parsing attributes in process `syz-executor.1'.
PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex
==================================================================
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 ffff8881aa86f6b8 by task syz-executor.1/12679

CPU: 1 PID: 12679 Comm: syz-executor.1 Not tainted 4.14.150+ #0
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xca/0x134 lib/dump_stack.c:53
 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:6148
 __perf_event_output kernel/events/core.c:6264 [inline]
 perf_event_output_forward+0xdc/0x220 kernel/events/core.c:6282
 __perf_event_overflow+0x12d/0x340 kernel/events/core.c:7520
 perf_swevent_overflow+0x7a/0xf0 kernel/events/core.c:7596
 perf_swevent_event+0x112/0x270 kernel/events/core.c:7634
 perf_tp_event+0x633/0x7f0 kernel/events/core.c:8058
 perf_trace_run_bpf_submit kernel/events/core.c:8028 [inline]
 perf_trace_run_bpf_submit+0x113/0x170 kernel/events/core.c:8014
 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
 rcu_lock_acquire include/linux/rcupdate.h:242 [inline]
 rcu_read_lock include/linux/rcupdate.h:629 [inline]
 __is_insn_slot_addr+0x3d/0x1e0 kernel/kprobes.c:293
 is_kprobe_optinsn_slot include/linux/kprobes.h:345 [inline]
 kernel_text_address+0x75/0x120 kernel/extable.c:148
 __kernel_text_address+0x9/0x30 kernel/extable.c:105
 unwind_get_return_address arch/x86/kernel/unwind_orc.c:255 [inline]
 unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:250
 __save_stack_trace+0x8a/0xf0 arch/x86/kernel/stacktrace.c:45
 save_stack mm/kasan/common.c:76 [inline]
 set_track mm/kasan/common.c:85 [inline]
 __kasan_slab_free+0x164/0x210 mm/kasan/common.c:463
 slab_free_hook mm/slub.c:1407 [inline]
 slab_free_freelist_hook mm/slub.c:1458 [inline]
 slab_free mm/slub.c:3039 [inline]
 kmem_cache_free+0xd7/0x3b0 mm/slub.c:3055
 security_file_free+0x48/0x80 security/security.c:881
 put_filp+0x31/0x97 fs/file_table.c:307
 path_openat+0x1b83/0x2be0 fs/namei.c:3677
 do_filp_open+0x1a1/0x280 fs/namei.c:3715
 do_sys_open+0x2ca/0x590 fs/open.c:1096
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459a59
RSP: 002b:00007f54661ffc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459a59
RDX: 0000000000000000 RSI: 0000000020000500 RDI: ffffffffffffffff
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f54662006d4
R13: 00000000004c64ff R14: 00000000004db8b8 R15: 00000000ffffffff

The buggy address belongs to the page:
page:ffffea0006aa1bc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000000()
raw: 4000000000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 dead000000000200 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881aa86f580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881aa86f600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1
>ffff8881aa86f680: f1 f1 f1 f1 04 f2 00 f3 f3 f3 00 00 00 00 00 00
                                        ^
 ffff8881aa86f700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881aa86f780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================