audit: type=1400 audit(2000000956.290:109967): avc:  denied  { map } for  pid=17400 comm="modprobe" path="/lib/x86_64-linux-gnu/ld-2.13.so" dev="sda1" ino=2668 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
==================================================================
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 ffff8881c6aafc18 by task syz-executor.3/17410

CPU: 0 PID: 17410 Comm: syz-executor.3 Not tainted 4.14.155-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 include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152
 spin_lock include/linux/spinlock.h:317 [inline]
 task_lock include/linux/sched/task.h:131 [inline]
 chroot_fs_refs+0xe7/0x560 fs/fs_struct.c:66
 SYSC_pivot_root fs/namespace.c:3260 [inline]
 SyS_pivot_root+0xb82/0xfb0 fs/namespace.c:3180
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a639
RSP: 002b:00007f4087881c78 EFLAGS: 00000246 ORIG_RAX: 000000000000009b
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000045a639
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000020000140
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f40878826d4
R13: 00000000004c7bf0 R14: 00000000004ddc30 R15: 00000000ffffffff

The buggy address belongs to the page:
page:ffffea00071aabc0 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:
 ffff8881c6aafb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881c6aafb80: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 f1 f1
>ffff8881c6aafc00: 04 f2 00 f3 f3 f3 00 00 00 00 00 00 00 00 00 00
                            ^
 ffff8881c6aafc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881c6aafd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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