IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
==================================================================
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 ffff88808938f6a8 by task syz-executor.2/8061

CPU: 0 PID: 8061 Comm: syz-executor.2 Not tainted 4.14.195-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_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 slab_post_alloc_hook mm/slab.h:442 [inline]
 slab_alloc_node mm/slab.c:3333 [inline]
 kmem_cache_alloc_node+0x133/0x410 mm/slab.c:3640
 __alloc_skb+0x5c/0x510 net/core/skbuff.c:193
 alloc_skb include/linux/skbuff.h:980 [inline]
 ndisc_alloc_skb+0x134/0x310 net/ipv6/ndisc.c:402
 ndisc_send_rs+0x2ec/0x630 net/ipv6/ndisc.c:661
 addrconf_rs_timer+0x249/0x550 net/ipv6/addrconf.c:3765
 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280
 expire_timers+0x232/0x4d0 kernel/time/timer.c:1319
 __run_timers kernel/time/timer.c:1644 [inline]
 run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1657
 __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:ffff88808938f590 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff0fa2d20 RBX: ffff88809e9d6500 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff88809e9d6d84
RBP: ffff88808b370d80 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88809e9d6500 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
 perf_poll+0xd8/0x1c0 kernel/events/core.c:4659
 retint_kernel+0x2d/0x2d
RIP: 81474ae0:ORMASK+0x514c/0x13e8ac
RSP: 0000:ffffffff00000000 EFLAGS: 00000286 ORIG_RAX: 0000000041b58ab3
RAX: ffffffff8653cf30 RBX: ffffffff81697d88 RCX: 0000000000000286
RDX: 0000000000000286 RSI: ffff88809e9d6d80 RDI: ffffffff814754c0
RBP: ffff88808b370d80 R08: ffffffff87892fd0 R09: 0000000041b58ab3
R10: ffffffff819382be R11: ffffffff87d84e60 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffff11011271eca

The buggy address belongs to the page:
page:ffffea000224e3c0 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:
 ffff88808938f580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808938f600: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00
>ffff88808938f680: 00 f2 00 00 00 f2 f2 f2 00 00 00 00 00 f3 f3 f3
                                  ^
 ffff88808938f700: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808938f780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================