==================================================================
BUG: KASAN: use-after-free in ip6_dst_idev include/net/ip6_fib.h:141 [inline]
BUG: KASAN: use-after-free in ip6_xmit+0x177c/0x1a00 net/ipv6/ip6_output.c:237
Read of size 8 at addr ffff8801d0888798 by task syz-executor3/2108

CPU: 1 PID: 2108 Comm: syz-executor3 Not tainted 4.4.145-g2241aa9 #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 400c51028307ef74 ffff88009c077598 ffffffff81e123cd
 ffffea0007422200 ffff8801d0888798 0000000000000000 ffff8801d0888798
 0000000000001300 ffff88009c0775d0 ffffffff81517d66 ffff8801d0888798
Call Trace:
 [<ffffffff81e123cd>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e123cd>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff81517d66>] print_address_description+0x6c/0x216 mm/kasan/report.c:252
 [<ffffffff81518085>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff81518085>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814fbb74>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff8343200c>] ip6_dst_idev include/net/ip6_fib.h:141 [inline]
 [<ffffffff8343200c>] ip6_xmit+0x177c/0x1a00 net/ipv6/ip6_output.c:237
 [<ffffffff834f2055>] inet6_csk_xmit+0x245/0x490 net/ipv6/inet6_connection_sock.c:176
binder_alloc: 2120: binder_alloc_buf size 9007410781880320 failed, no address space
binder_alloc: allocated: 0 (num: 0 largest: 0), free: 16384 (num: 1 largest: 16384)
binder: 2120:2124 transaction failed 29201/-28, size 206158430208-9007204623450112 line 3137
 [<ffffffff835a169b>] l2tp_xmit_core net/l2tp/l2tp_core.c:1084 [inline]
 [<ffffffff835a169b>] l2tp_xmit_skb+0xbeb/0xeb0 net/l2tp/l2tp_core.c:1179
 [<ffffffff835adbd0>] pppol2tp_sendmsg+0x4e0/0x7d0 net/l2tp/l2tp_ppp.c:355
 [<ffffffff82f22e1c>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82f22e1c>] sock_sendmsg+0xcc/0x110 net/socket.c:635
 [<ffffffff82f23083>] sock_write_iter+0x223/0x3b0 net/socket.c:834
 [<ffffffff8151fc4c>] do_iter_readv_writev+0x13c/0x1e0 fs/read_write.c:664
 [<ffffffff81521bb2>] compat_do_readv_writev+0x2e2/0x6e0 fs/read_write.c:982
 [<ffffffff81522351>] compat_writev+0xe1/0x150 fs/read_write.c:1090
 [<ffffffff81524668>] C_SYSC_writev fs/read_write.c:1110 [inline]
 [<ffffffff81524668>] compat_SyS_writev+0xd8/0x1c0 fs/read_write.c:1099
 [<ffffffff81006d94>] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline]
 [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff838c9e43>] sysenter_flags_fixed+0xd/0x1a

Allocated by task 32185:
 [<ffffffff81034676>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fac23>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814faf07>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814faf07>] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814fb4d2>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:554
 [<ffffffff814f6fce>] slab_post_alloc_hook mm/slub.c:1349 [inline]
 [<ffffffff814f6fce>] slab_alloc_node mm/slub.c:2615 [inline]
 [<ffffffff814f6fce>] slab_alloc mm/slub.c:2623 [inline]
 [<ffffffff814f6fce>] kmem_cache_alloc+0xbe/0x2a0 mm/slub.c:2628
 [<ffffffff82fa1375>] dst_alloc+0xb5/0x1a0 net/core/dst.c:210
 [<ffffffff831ee4c8>] rt_dst_alloc+0x78/0x430 net/ipv4/route.c:1478
 [<ffffffff831f798c>] __mkroute_output net/ipv4/route.c:2132 [inline]
 [<ffffffff831f798c>] __ip_route_output_key_hash+0x9ac/0x2380 net/ipv4/route.c:2344
 [<ffffffff831f9e39>] __ip_route_output_key include/net/route.h:124 [inline]
 [<ffffffff831f9e39>] ip_route_output_flow+0x29/0xa0 net/ipv4/route.c:2431
 [<ffffffff8330fec2>] ip_route_output_ports include/net/route.h:161 [inline]
 [<ffffffff8330fec2>] igmpv3_newpack+0x2a2/0xea0 net/ipv4/igmp.c:371
 [<ffffffff83310cf5>] add_grhead.isra.31+0x235/0x300 net/ipv4/igmp.c:442
 [<ffffffff83311a60>] add_grec+0xca0/0xf00 net/ipv4/igmp.c:564
 [<ffffffff83314809>] igmpv3_send_cr net/ipv4/igmp.c:693 [inline]
 [<ffffffff83314809>] igmp_ifc_timer_expire+0x3d9/0x8a0 net/ipv4/igmp.c:790
 [<ffffffff81292d4c>] call_timer_fn+0x18c/0x870 kernel/time/timer.c:1185
 [<ffffffff81293a72>] __run_timers kernel/time/timer.c:1261 [inline]
 [<ffffffff81293a72>] run_timer_softirq+0x642/0xb90 kernel/time/timer.c:1444
 [<ffffffff838cb9fc>] __do_softirq+0x22c/0xa1a kernel/softirq.c:273

Freed by task 3:
 [<ffffffff81034676>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fac23>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fb552>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fb552>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814f86de>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814f86de>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814f86de>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814f86de>] kmem_cache_free+0xbe/0x340 mm/slub.c:2881
 [<ffffffff82fa0625>] dst_destroy.part.6+0x1f5/0x330 net/core/dst.c:270
 [<ffffffff82fa0ca5>] dst_destroy net/core/dst.c:252 [inline]
 [<ffffffff82fa0ca5>] dst_destroy_rcu+0x15/0x40 net/core/dst.c:295
 [<ffffffff81287fb7>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
 [<ffffffff81287fb7>] rcu_do_batch kernel/rcu/tree.c:2705 [inline]
 [<ffffffff81287fb7>] invoke_rcu_callbacks kernel/rcu/tree.c:2973 [inline]
 [<ffffffff81287fb7>] __rcu_process_callbacks kernel/rcu/tree.c:2940 [inline]
 [<ffffffff81287fb7>] rcu_process_callbacks+0x927/0x1440 kernel/rcu/tree.c:2957
 [<ffffffff838cb9fc>] __do_softirq+0x22c/0xa1a kernel/softirq.c:273

The buggy address belongs to the object at ffff8801d0888780
 which belongs to the cache ip_dst_cache of size 208
The buggy address is located 24 bytes inside of
 208-byte region [ffff8801d0888780, ffff8801d0888850)
The buggy address belongs to the page:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 32407 Comm: kworker/u4:7 Not tainted 4.4.145-g2241aa9 #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
task: ffff8801d9311800 task.stack: ffff8801ca748000
RIP: 0010:[<ffffffff81e2fd38>]  [<ffffffff81e2fd38>] timerqueue_add+0xb8/0x2b0 lib/timerqueue.c:51
RSP: 0018:ffff8801db207d30  EFLAGS: 00010007
RAX: ffffed003b64339b RBX: ffff8801db219cc0 RCX: 0000000000000000
RDX: 000000001083e1e8 RSI: ffffffff81e2fd1c RDI: 00000000841f0f46
RBP: ffff8801db207d70 R08: 0000000000000096 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8801d9311800 R12: dffffc0000000000
R13: 00000000841f0f2e R14: 0000007343478680 R15: ffffffff8148f2d7
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ac1da04460 CR3: 00000000b3b17000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801db219cd8 ffff8801db219790 ffffed003b64339b ffff8801db219780
 ffff8801db219cc0 ffff8801db2196c0 0000000000000005 0000000000000000
 ffff8801db207da8 ffffffff8129d61f ffff8801db219cc0 0000000000000001
Call Trace:
 <IRQ> 
 [<ffffffff8129d61f>] enqueue_hrtimer+0x15f/0x440 kernel/time/hrtimer.c:893
 [<ffffffff812a0312>] __run_hrtimer kernel/time/hrtimer.c:1276 [inline]
 [<ffffffff812a0312>] __hrtimer_run_queues+0x6b2/0x1000 kernel/time/hrtimer.c:1325
 [<ffffffff812a1781>] hrtimer_interrupt+0x1b1/0x430 kernel/time/hrtimer.c:1359
 [<ffffffff810af3a4>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:901
 [<ffffffff838cb15c>] smp_apic_timer_interrupt+0x7c/0xa0 arch/x86/kernel/apic/apic.c:925
 [<ffffffff838ca0a0>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:741
 <EOI> 
 [<ffffffff812d6619>] smp_call_function_many+0x5b9/0x710 kernel/smp.c:435
 [<ffffffff810eb0ed>] native_flush_tlb_others+0xfd/0x6e0 arch/x86/mm/tlb.c:325
 [<ffffffff810eb7dc>] flush_tlb_others arch/x86/include/asm/paravirt.h:338 [inline]
 [<ffffffff810eb7dc>] flush_tlb_mm_range+0x10c/0x540 arch/x86/mm/tlb.c:391
 [<ffffffff814c90fc>] flush_tlb_page arch/x86/include/asm/tlbflush.h:300 [inline]
 [<ffffffff814c90fc>] ptep_clear_flush+0xec/0x110 mm/pgtable-generic.c:80
 [<ffffffff814ba47c>] page_mkclean_one+0x10c/0x1d0 mm/rmap.c:1015
 [<ffffffff814be404>] rmap_walk_file mm/rmap.c:1673 [inline]
 [<ffffffff814be404>] rmap_walk+0x564/0xab0 mm/rmap.c:1692
 [<ffffffff814beed8>] page_mkclean+0x138/0x1b0 mm/rmap.c:1059
 [<ffffffff8143b819>] clear_page_dirty_for_io+0x1a9/0x3f0 mm/page-writeback.c:2677
 [<ffffffff816d6417>] mpage_submit_page+0x77/0x240 fs/ext4/inode.c:1973
 [<ffffffff816d6992>] mpage_process_page_bufs+0x3b2/0x490 fs/ext4/inode.c:2097
 [<ffffffff816d9e49>] mpage_prepare_extent_to_map+0x449/0x8e0 fs/ext4/inode.c:2465
 [<ffffffff816ec340>] ext4_writepages+0xbb0/0x2c80 fs/ext4/inode.c:2619
 [<ffffffff8144243f>] do_writepages+0xef/0x1d0 mm/page-writeback.c:2334
 [<ffffffff815a2ed1>] __writeback_single_inode+0x101/0x1330 fs/fs-writeback.c:1285
 [<ffffffff815a537b>] writeback_sb_inodes+0x4ab/0xee0 fs/fs-writeback.c:1548
 [<ffffffff815a5eab>] __writeback_inodes_wb+0xfb/0x1e0 fs/fs-writeback.c:1617
 [<ffffffff815a6649>] wb_writeback+0x529/0xd00 fs/fs-writeback.c:1726
 [<ffffffff815b2ca5>] wb_do_writeback fs/fs-writeback.c:1858 [inline]
 [<ffffffff815b2ca5>] wb_workfn+0x245/0xf20 fs/fs-writeback.c:1894
 [<ffffffff811841df>] process_one_work+0x7df/0x1600 kernel/workqueue.c:2064
 [<ffffffff811850d9>] worker_thread+0xd9/0xfc0 kernel/workqueue.c:2196
 [<ffffffff81192be8>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff838c8915>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510
Code: 00 00 4d 8b 2f 4d 85 ed 74 3d e8 54 3a 52 ff 48 8b 45 d0 80 38 00 0f 85 96 01 00 00 49 8d 7d 18 4c 8b 73 18 48 89 fa 48 c1 ea 03 <42> 80 3c 22 00 0f 85 8a 01 00 00 4d 3b 75 18 7c a3 e8 22 3a 52 
RIP  [<ffffffff81e2fd38>] timerqueue_add+0xb8/0x2b0 lib/timerqueue.c:51
 RSP <ffff8801db207d30>
---[ end trace db9a6222f478a803 ]---