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BUG: KASAN: stack-out-of-bounds in deref_stack_regs arch/x86/kernel/unwind_orc.c:290 [inline]
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1595/0x1930 arch/x86/kernel/unwind_orc.c:420
Read of size 8 at addr ffff8801cf40fd28 by task syz-executor240/2130

CPU: 0 PID: 2130 Comm: syz-executor240 Not tainted 4.14.78+ #26
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x11b lib/dump_stack.c:53
 print_address_description+0x60/0x22b mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report.cold.6+0x11b/0x2dd mm/kasan/report.c:409
 deref_stack_regs arch/x86/kernel/unwind_orc.c:290 [inline]
 unwind_next_frame+0x1595/0x1930 arch/x86/kernel/unwind_orc.c:420
 perf_callchain_kernel+0x39c/0x540 arch/x86/events/core.c:2354
 get_perf_callchain+0x2eb/0x760 kernel/events/callchain.c:217
 perf_callchain+0x14a/0x190 kernel/events/callchain.c:190
 perf_prepare_sample+0x704/0x13c0 kernel/events/core.c:6140
 __perf_event_output kernel/events/core.c:6256 [inline]
 perf_event_output_forward+0xeb/0x230 kernel/events/core.c:6274
 __perf_event_overflow+0x116/0x320 kernel/events/core.c:7510
 perf_swevent_overflow+0x166/0x1f0 kernel/events/core.c:7586
 perf_swevent_event+0x19c/0x270 kernel/events/core.c:7619
 perf_tp_event+0x5e5/0x790 kernel/events/core.c:8048
 perf_trace_run_bpf_submit+0x10f/0x170 kernel/events/core.c:8018
 perf_trace_lock+0x2f6/0x4c0 include/trace/events/lock.h:39
 trace_lock_release include/trace/events/lock.h:58 [inline]
 lock_release+0x4dc/0x720 kernel/locking/lockdep.c:4009
 __raw_read_unlock include/linux/rwlock_api_smp.h:225 [inline]
 _raw_read_unlock+0x17/0x40 kernel/locking/spinlock.c:256
 netlink_lock_table net/netlink/af_netlink.c:436 [inline]
 netlink_create+0xc7/0x510 net/netlink/af_netlink.c:653
 __sock_create+0x2f7/0x600 net/socket.c:1274
 sock_create net/socket.c:1314 [inline]
 SYSC_socket net/socket.c:1344 [inline]
 SyS_socket+0xdf/0x1d0 net/socket.c:1324
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x446419
RSP: 002b:00007f1efa3cfda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446419
RDX: 0000000000000000 RSI: 0020000000080003 RDI: 0000000000000010
RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c
R13: 0020000000080003 R14: 00007f1efa3d09c0 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea00073d03c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000000()
raw: 4000000000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 ffffea00073d03e0 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cf40fc00: 00 00 00 00 00 f1 f1 f1 f1 04 f2 f2 f2 f2 f2 f2
 ffff8801cf40fc80: f2 00 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00
>ffff8801cf40fd00: 00 00 00 f1 f1 f1 f1 04 f2 f2 f2 00 00 00 00 00
                                  ^
 ffff8801cf40fd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801cf40fe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1
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