random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available)
random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available)
random: nonblocking pool is initialized
==================================================================
BUG: KASAN: use-after-free in ip6_dst_idev include/net/ip6_fib.h:141 [inline]
BUG: KASAN: use-after-free in ip6_xmit+0x1a2c/0x1a70 net/ipv6/ip6_output.c:237
Read of size 8 at addr ffff8801d487e3d8 by task syzkaller306006/3765

CPU: 1 PID: 3765 Comm: syzkaller306006 Not tainted 4.4.120-gd63fdf6 #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 e99685ed58ae712c ffff8800ad4d77e0 ffffffff81d0408d
 ffffea0007521f80 ffff8801d487e3d8 0000000000000000 ffff8801d487e3d8
 0000000000000040 ffff8800ad4d7818 ffffffff814fe143 ffff8801d487e3d8
Call Trace:
 [<ffffffff81d0408d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0408d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff814fe143>] print_address_description+0x73/0x260 mm/kasan/report.c:252
 [<ffffffff814fe655>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff814fe655>] kasan_report+0x285/0x370 mm/kasan/report.c:408
 [<ffffffff814fe7b4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff8330649c>] ip6_dst_idev include/net/ip6_fib.h:141 [inline]
 [<ffffffff8330649c>] ip6_xmit+0x1a2c/0x1a70 net/ipv6/ip6_output.c:237
 [<ffffffff833c70f6>] inet6_csk_xmit+0x246/0x480 net/ipv6/inet6_connection_sock.c:176
 [<ffffffff83459bef>] l2tp_xmit_core net/l2tp/l2tp_core.c:1084 [inline]
 [<ffffffff83459bef>] l2tp_xmit_skb+0xc2f/0xea0 net/l2tp/l2tp_core.c:1179
 [<ffffffff834666d4>] pppol2tp_sendmsg+0x584/0x7f0 net/l2tp/l2tp_ppp.c:355
 [<ffffffff82deba6a>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82deba6a>] sock_sendmsg+0xca/0x110 net/socket.c:635
 [<ffffffff82dec9b8>] SYSC_sendto+0x2c8/0x340 net/socket.c:1665
 [<ffffffff82deeeb0>] SyS_sendto+0x40/0x50 net/socket.c:1633
 [<ffffffff8377395f>] entry_SYSCALL_64_fastpath+0x1c/0x98

Allocated by task 3752:
 [<ffffffff81035d96>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fd1b3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fd47d>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fd47d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814fda52>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:554
 [<ffffffff814f912a>] slab_post_alloc_hook mm/slub.c:1349 [inline]
 [<ffffffff814f912a>] slab_alloc_node mm/slub.c:2615 [inline]
 [<ffffffff814f912a>] slab_alloc mm/slub.c:2623 [inline]
 [<ffffffff814f912a>] kmem_cache_alloc+0xba/0x290 mm/slub.c:2628
 [<ffffffff82e6964f>] dst_alloc+0x11f/0x1a0 net/core/dst.c:210
 [<ffffffff830c27d8>] rt_dst_alloc+0x78/0x430 net/ipv4/route.c:1467
 [<ffffffff830cbc6e>] __mkroute_output net/ipv4/route.c:2120 [inline]
 [<ffffffff830cbc6e>] __ip_route_output_key_hash+0xa4e/0x2390 net/ipv4/route.c:2332
 [<ffffffff83195fc5>] __ip_route_output_key include/net/route.h:123 [inline]
 [<ffffffff83195fc5>] ip_route_connect include/net/route.h:296 [inline]
 [<ffffffff83195fc5>] __ip4_datagram_connect+0xa15/0x1150 net/ipv4/datagram.c:51
 [<ffffffff833b8109>] __ip6_datagram_connect+0x4d9/0x1950 net/ipv6/datagram.c:59
 [<ffffffff833b95af>] ip6_datagram_connect+0x2f/0x50 net/ipv6/datagram.c:223
 [<ffffffff831d0a1b>] inet_dgram_connect+0x16b/0x1f0 net/ipv4/af_inet.c:550
 [<ffffffff82dec596>] SYSC_connect+0x1b6/0x310 net/socket.c:1557
 [<ffffffff82deee04>] SyS_connect+0x24/0x30 net/socket.c:1538
 [<ffffffff8377395f>] entry_SYSCALL_64_fastpath+0x1c/0x98

Freed by task 0:
 [<ffffffff81035d96>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fd1b3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fdad2>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fdad2>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814fa217>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814fa217>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814fa217>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814fa217>] kmem_cache_free+0xc7/0x320 mm/slub.c:2881
 [<ffffffff82e6a2ee>] dst_destroy+0x20e/0x330 net/core/dst.c:270
 [<ffffffff82e6a935>] dst_destroy_rcu+0x15/0x40 net/core/dst.c:295
 [<ffffffff812950d4>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
 [<ffffffff812950d4>] rcu_do_batch kernel/rcu/tree.c:2705 [inline]
 [<ffffffff812950d4>] invoke_rcu_callbacks kernel/rcu/tree.c:2973 [inline]
 [<ffffffff812950d4>] __rcu_process_callbacks kernel/rcu/tree.c:2940 [inline]
 [<ffffffff812950d4>] rcu_process_callbacks+0x7f4/0x14a0 kernel/rcu/tree.c:2957
 [<ffffffff83776e57>] __do_softirq+0x227/0xa38 kernel/softirq.c:273

The buggy address belongs to the object at ffff8801d487e3c0
 which belongs to the cache ip_dst_cache of size 208
The buggy address is located 24 bytes inside of
 208-byte region [ffff8801d487e3c0, ffff8801d487e490)
The buggy address belongs to the page:
INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 0 PID: 3766 Comm: init Not tainted 4.4.120-gd63fdf6 #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 4d7c7077c580dec6 ffff8800addefa20 ffffffff81d0408d
 ffffffff85153f60 0000000000000000 ffff8801c66e3000 ffff8800ab807dd8
 0000000000000000 ffff8800addefa30 ffffffff8141adb3 ffff8800addefbd8
Call Trace:
 [<ffffffff81d0408d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0408d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8141adb3>] register_lock_class.part.26+0x32/0x36 kernel/locking/lockdep.c:762
 [<ffffffff8123ae59>] register_lock_class kernel/locking/lockdep.c:767 [inline]
 [<ffffffff8123ae59>] __lock_acquire+0x3a49/0x4b50 kernel/locking/lockdep.c:3101
 [<ffffffff8123d7ce>] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592
 [<ffffffff83772ad6>] __raw_spin_lock include/linux/spinlock_api_smp.h:144 [inline]
 [<ffffffff83772ad6>] _raw_spin_lock+0x36/0x50 kernel/locking/spinlock.c:151
 [<ffffffff814a23a2>] spin_lock include/linux/spinlock.h:302 [inline]
 [<ffffffff814a23a2>] do_anonymous_page mm/memory.c:2722 [inline]
 [<ffffffff814a23a2>] handle_pte_fault mm/memory.c:3295 [inline]
 [<ffffffff814a23a2>] __handle_mm_fault mm/memory.c:3426 [inline]
 [<ffffffff814a23a2>] handle_mm_fault+0x1f52/0x3190 mm/memory.c:3455
 [<ffffffff810dc6cb>] __do_page_fault+0x35b/0xa00 arch/x86/mm/fault.c:1245
 [<ffffffff810dcd97>] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1308
 [<ffffffff83774d88>] page_fault+0x28/0x30 arch/x86/entry/entry_64.S:1033
 [<ffffffff83773d3f>] ret_from_fork+0xf/0x80 arch/x86/entry/entry_64.S:486
------------[ cut here ]------------
kernel BUG at include/linux/mm.h:460!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3766 Comm: init Not tainted 4.4.120-gd63fdf6 #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c66e3000 task.stack: ffff8800adde8000
RIP: 0010:[<ffffffff814909c1>]  [<ffffffff814909c1>] dump_page mm/debug.c:105 [inline]
RIP: 0010:[<ffffffff814909c1>]  [<ffffffff814909c1>] page_mapcount include/linux/mm.h:460 [inline]
RIP: 0010:[<ffffffff814909c1>]  [<ffffffff814909c1>] dump_page_badflags+0x191/0x250 mm/debug.c:85
RSP: 0018:ffff8801db207d18  EFLAGS: 00010206
RAX: ffffffff814909c1 RBX: ffff8801db207d68 RCX: ffffffff812a0eeb
RDX: 0000000000000100 RSI: ffffffff847ebf78 RDI: ffff8800ab841500
RBP: ffff8801db207df0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff838444e0 R11: 1ffff1003b640f70 R12: 1ffff1003b640fa9
R13: ffff8800ab841ab0 R14: 0000000000000102 R15: ffffffff838444e0
FS:  00007fe5fe5747a0(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe5fe574a70 CR3: 00000000af730000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff812a0efb ffffffff812a0e4c 0000000000000000 ffffffff842c35a0
 ffff8800ab841500 ffffffff814909c1 0000000041b58ab3 ffffffff83faab59
 ffffffff812a0d70 ffffffff812a2952 ffff8800ab841b40 0000000000000000
Call Trace:
 <IRQ> 
 [<ffffffff812a2e54>] __run_timers kernel/time/timer.c:1261 [inline]
 [<ffffffff812a2e54>] run_timer_softirq+0x604/0xbb0 kernel/time/timer.c:1444
 [<ffffffff83776e57>] __do_softirq+0x227/0xa38 kernel/softirq.c:273
 [<ffffffff8113daa9>] invoke_softirq kernel/softirq.c:350 [inline]
 [<ffffffff8113daa9>] irq_exit+0x119/0x140 kernel/softirq.c:391
 [<ffffffff837765bb>] exiting_irq arch/x86/include/asm/apic.h:653 [inline]
 [<ffffffff837765bb>] smp_apic_timer_interrupt+0x7b/0xa0 arch/x86/kernel/apic/apic.c:926
 [<ffffffff83775510>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:737
 <EOI> 
 [<ffffffff81d2ffba>] __delay+0xa/0x10 arch/x86/lib/delay.c:160
 [<ffffffff81246dc1>] __spin_lock_debug kernel/locking/spinlock_debug.c:114 [inline]
 [<ffffffff81246dc1>] do_raw_spin_lock+0x151/0x2c0 kernel/locking/spinlock_debug.c:137
 [<ffffffff83772ade>] __raw_spin_lock include/linux/spinlock_api_smp.h:145 [inline]
 [<ffffffff83772ade>] _raw_spin_lock+0x3e/0x50 kernel/locking/spinlock.c:151
 [<ffffffff814a23a2>] spin_lock include/linux/spinlock.h:302 [inline]
 [<ffffffff814a23a2>] do_anonymous_page mm/memory.c:2722 [inline]
 [<ffffffff814a23a2>] handle_pte_fault mm/memory.c:3295 [inline]
 [<ffffffff814a23a2>] __handle_mm_fault mm/memory.c:3426 [inline]
 [<ffffffff814a23a2>] handle_mm_fault+0x1f52/0x3190 mm/memory.c:3455
 [<ffffffff810dc6cb>] __do_page_fault+0x35b/0xa00 arch/x86/mm/fault.c:1245
 [<ffffffff810dcd97>] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1308
 [<ffffffff83774d88>] page_fault+0x28/0x30 arch/x86/entry/entry_64.S:1033
 [<ffffffff83773d3f>] ret_from_fork+0xf/0x80 arch/x86/entry/entry_64.S:486
Code: 46 e8 b4 03 ed ff 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 a0 03 ed ff 31 d2 48 c7 c6 60 90 8a 83 48 89 df e8 6f fe ff ff <0f> 0b e8 b8 dd 06 00 e9 21 ff ff ff 89 4d d4 e8 ab dd 06 00 8b 
RIP  [<ffffffff814909c1>] dump_page mm/debug.c:105 [inline]
RIP  [<ffffffff814909c1>] page_mapcount include/linux/mm.h:460 [inline]
RIP  [<ffffffff814909c1>] dump_page_badflags+0x191/0x250 mm/debug.c:85
 RSP <ffff8801db207d18>
---[ end trace b432bd2acd085a21 ]---