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BUG: KASAN: stack-out-of-bounds in deref_stack_regs arch/x86/kernel/unwind_orc.c:308 [inline]
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1757/0x1810 arch/x86/kernel/unwind_orc.c:437
Read of size 8 at addr ffff8881a3dcfd40 by task syz-executor.5/12206

CPU: 0 PID: 12206 Comm: syz-executor.5 Not tainted 4.14.156-syzkaller #0
Call Trace:
 <IRQ>
 __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
 deref_stack_regs arch/x86/kernel/unwind_orc.c:308 [inline]
 unwind_next_frame+0x1757/0x1810 arch/x86/kernel/unwind_orc.c:437
 __save_stack_trace+0x7a/0xf0 arch/x86/kernel/stacktrace.c:44
 save_stack mm/kasan/common.c:76 [inline]
 set_track mm/kasan/common.c:85 [inline]
 __kasan_kmalloc.part.0+0x53/0xc0 mm/kasan/common.c:501
 slab_post_alloc_hook mm/slab.h:439 [inline]
 slab_alloc_node mm/slub.c:2792 [inline]
 slab_alloc mm/slub.c:2800 [inline]
 kmem_cache_alloc+0xee/0x360 mm/slub.c:2805
 __build_skb+0x30/0x2f0 net/core/skbuff.c:281
 __napi_alloc_skb+0x1e1/0x320 net/core/skbuff.c:486
 napi_alloc_skb include/linux/skbuff.h:2690 [inline]
 page_to_skb+0xaf/0x6e0 drivers/net/virtio_net.c:323
 receive_mergeable drivers/net/virtio_net.c:719 [inline]
 receive_buf+0x179d/0x4300 drivers/net/virtio_net.c:824
 virtnet_receive drivers/net/virtio_net.c:1098 [inline]
 virtnet_poll+0x4e6/0x9f0 drivers/net/virtio_net.c:1189
 napi_poll net/core/dev.c:5598 [inline]
 net_rx_action+0x366/0xcd0 net/core/dev.c:5664
 __do_softirq+0x234/0x9ec kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x114/0x150 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:648 [inline]
 do_IRQ+0x104/0x1c0 arch/x86/kernel/irq.c:242
 common_interrupt+0x8c/0x8c arch/x86/entry/entry_64.S:576
 </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_is_held_type+0x54/0x150 kernel/locking/lockdep.c:4028
RSP: 0018:ffff8881a3dcfaf0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff6e
RAX: 0000000000000000 RBX: ffff8881957fde00 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff8881957fe62c
RBP: ffffffffa72d5220 R08: 0000000000000001 R09: ffffed103ae844fa
R10: ffffed103ae844f9 R11: ffff8881d74227cf R12: ffffffffa587fe95
R13: 0000000000000000 R14: ffff8881ceb97a08 R15: ffffed1039d72f42
 context_destroy security/selinux/ss/context.h:145 [inline]
 security_compute_sid.part.0+0xaa5/0x10a0 security/selinux/ss/services.c:1743
 retint_kernel+0x2d/0x2d
RIP: 0010:selinux_socket_create+0x2e0/0x4e7 security/selinux/hooks.c:4407
RSP: a5855230:ffffffffa706d658 EFLAGS: 41b58ab3 ORIG_RAX: 00000000000000cd
RAX: ffff8881c5304bd0 RBX: 00000000000000cd RCX: 1ffff110347b9fa7
RDX: 000000000000001f RSI: 0000000000000000 RDI: ffff8881c5304bd4
RBP: 000000000000001f R08: 0000000000000001 R09: ffffffffa5883d8b
R10: 0000000000000000 R11: 00000000000000cd R12: ffff8881a3dcfd58
R13: 0000000000000001 R14: c63d5e3505eccd00 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea00068f73c0 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:
 ffff8881a3dcfc00: f2 f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 f3 f3
 ffff8881a3dcfc80: f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881a3dcfd00: 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f3 f3 f3 00
                                           ^
 ffff8881a3dcfd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881a3dcfe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1
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