random: crng init done
random: 7 urandom warning(s) missed due to ratelimiting
==================================================================
BUG: KASAN: stack-out-of-bounds in deref_stack_regs arch/x86/kernel/unwind_orc.c:312 [inline]
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x142e/0x17d0 arch/x86/kernel/unwind_orc.c:444
Read of size 8 at addr ffff88807b9a76a8 by task syz-executor.0/14636

CPU: 1 PID: 14636 Comm: syz-executor.0 Not tainted 4.14.193-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
 deref_stack_regs arch/x86/kernel/unwind_orc.c:312 [inline]
 unwind_next_frame+0x142e/0x17d0 arch/x86/kernel/unwind_orc.c:444
 __save_stack_trace+0x90/0x160 arch/x86/kernel/stacktrace.c:44
 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+0x254/0xa1d kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x193/0x240 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:648 [inline]
 smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
 </IRQ>
RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:774 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:796 [inline]
RIP: 0010:lock_acquire+0x97/0x3f0 kernel/locking/lockdep.c:3993
RSP: 0018:ffff88807b9a7590 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff0fa2d20 RBX: ffff888093d660c0 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff888093d66944
RBP: ffff8880863596c0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffff888093d660c0 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
 perf_poll+0xd8/0x1c0 kernel/events/core.c:4659
 retint_kernel+0x2d/0x2d
RIP: 81474bc0:ORMASK+0x514c/0x13e78c
RSP: 0000:ffffffff00000000 EFLAGS: 00000286 ORIG_RAX: 0000000041b58ab3
RAX: ffffffff8653a0e0 RBX: ffffffff81697cc8 RCX: 0000000000000286
RDX: 0000000000000286 RSI: ffff888093d66940 RDI: ffffffff814755a0
RBP: ffff8880863596c0 R08: ffffffff87892250 R09: 0000000041b58ab3
R10: ffffffff819380ee R11: ffffffff87d84e60 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffff1100f734eca

The buggy address belongs to the page:
page:ffffea0001ee69c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0xfffe0000000000()
raw: 00fffe0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88807b9a7580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807b9a7600: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00
>ffff88807b9a7680: 00 f2 00 00 00 f2 f2 f2 00 00 00 00 00 f3 f3 f3
                                  ^
 ffff88807b9a7700: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807b9a7780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================