IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
==================================================================
BUG: KASAN: use-after-free in tcp_skb_pcount include/net/tcp.h:796 [inline]
BUG: KASAN: use-after-free in tcp_init_tso_segs net/ipv4/tcp_output.c:1619 [inline]
BUG: KASAN: use-after-free in tcp_write_xmit+0x3fc2/0x4cb0 net/ipv4/tcp_output.c:2056
Read of size 2 at addr ffff8800bab66a30 by task syz-executor0/4104

CPU: 0 PID: 4104 Comm: syz-executor0 Not tainted 4.4.135-ge75204c #53
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 05ea7f6aa19870db ffff8801d826f700 ffffffff81e0ed0d
 ffffea0002ead980 ffff8800bab66a30 0000000000000000 ffff8800bab66a30
 dffffc0000000000 ffff8801d826f738 ffffffff81515946 ffff8800bab66a30
Call Trace:
 [<ffffffff81e0ed0d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e0ed0d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff81515946>] print_address_description+0x6c/0x216 mm/kasan/report.c:252
 [<ffffffff81515c65>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff81515c65>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814f9714>] __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:427
 [<ffffffff832864d2>] tcp_skb_pcount include/net/tcp.h:796 [inline]
 [<ffffffff832864d2>] tcp_init_tso_segs net/ipv4/tcp_output.c:1619 [inline]
 [<ffffffff832864d2>] tcp_write_xmit+0x3fc2/0x4cb0 net/ipv4/tcp_output.c:2056
 [<ffffffff83287990>] __tcp_push_pending_frames+0xa0/0x290 net/ipv4/tcp_output.c:2307
 [<ffffffff832391a2>] tcp_push+0x3e2/0x5a0 net/ipv4/tcp.c:692
 [<ffffffff83249e51>] tcp_sendmsg+0x1ac1/0x2b00 net/ipv4/tcp.c:1293
 [<ffffffff83300e43>] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:755
 [<ffffffff82f1e15c>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82f1e15c>] sock_sendmsg+0xcc/0x110 net/socket.c:635
 [<ffffffff82f1e3c3>] sock_write_iter+0x223/0x3b0 net/socket.c:834
 [<ffffffff8151cd3d>] new_sync_write fs/read_write.c:478 [inline]
 [<ffffffff8151cd3d>] __vfs_write+0x30d/0x3f0 fs/read_write.c:491
 [<ffffffff8151e921>] vfs_write+0x191/0x4e0 fs/read_write.c:538
 [<ffffffff81520f29>] SYSC_write fs/read_write.c:585 [inline]
 [<ffffffff81520f29>] SyS_write+0xd9/0x1c0 fs/read_write.c:577
 [<ffffffff81006d96>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0 arch/x86/entry/common.c:459
 [<ffffffff838c40aa>] sysenter_flags_fixed+0xd/0x17

Allocated by task 4104:
 [<ffffffff810341d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814f8803>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814f8ae7>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814f8ae7>] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814f90b2>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:554
 [<ffffffff814f4bae>] slab_post_alloc_hook mm/slub.c:1349 [inline]
 [<ffffffff814f4bae>] slab_alloc_node mm/slub.c:2615 [inline]
 [<ffffffff814f4bae>] slab_alloc mm/slub.c:2623 [inline]
 [<ffffffff814f4bae>] kmem_cache_alloc+0xbe/0x2a0 mm/slub.c:2628
 [<ffffffff82f38006>] kmem_cache_alloc_node include/linux/slab.h:350 [inline]
 [<ffffffff82f38006>] __alloc_skb+0xe6/0x600 net/core/skbuff.c:218
 [<ffffffff83246623>] alloc_skb_fclone include/linux/skbuff.h:856 [inline]
 [<ffffffff83246623>] sk_stream_alloc_skb+0xa3/0x5d0 net/ipv4/tcp.c:833
 [<ffffffff832490c4>] tcp_sendmsg+0xd34/0x2b00 net/ipv4/tcp.c:1178
 [<ffffffff83300e43>] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:755
 [<ffffffff82f1e15c>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82f1e15c>] sock_sendmsg+0xcc/0x110 net/socket.c:635
 [<ffffffff82f1e3c3>] sock_write_iter+0x223/0x3b0 net/socket.c:834
 [<ffffffff8151cd3d>] new_sync_write fs/read_write.c:478 [inline]
 [<ffffffff8151cd3d>] __vfs_write+0x30d/0x3f0 fs/read_write.c:491
 [<ffffffff8151e921>] vfs_write+0x191/0x4e0 fs/read_write.c:538
 [<ffffffff81520f29>] SYSC_write fs/read_write.c:585 [inline]
 [<ffffffff81520f29>] SyS_write+0xd9/0x1c0 fs/read_write.c:577
 [<ffffffff81006d96>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0 arch/x86/entry/common.c:459
 [<ffffffff838c40aa>] sysenter_flags_fixed+0xd/0x17

Freed by task 4106:
 [<ffffffff810341d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814f8803>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814f9132>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814f9132>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814f62be>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814f62be>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814f62be>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814f62be>] kmem_cache_free+0xbe/0x340 mm/slub.c:2881
 [<ffffffff82f351df>] kfree_skbmem+0xcf/0x100 net/core/skbuff.c:635
 [<ffffffff82f3725d>] __kfree_skb+0x1d/0x20 net/core/skbuff.c:676
 [<ffffffff83288784>] sk_wmem_free_skb include/net/sock.h:1447 [inline]
 [<ffffffff83288784>] tcp_write_queue_purge include/net/tcp.h:1460 [inline]
 [<ffffffff83288784>] tcp_connect_init net/ipv4/tcp_output.c:3122 [inline]
 [<ffffffff83288784>] tcp_connect+0xb24/0x30c0 net/ipv4/tcp_output.c:3261
 [<ffffffff8329b8e1>] tcp_v4_connect+0xf31/0x1890 net/ipv4/tcp_ipv4.c:246
 [<ffffffff832f9bf9>] __inet_stream_connect+0x2a9/0xc30 net/ipv4/af_inet.c:615
 [<ffffffff832fa5d5>] inet_stream_connect+0x55/0xa0 net/ipv4/af_inet.c:676
 [<ffffffff82f1ead8>] SYSC_connect+0x1b8/0x300 net/socket.c:1557
 [<ffffffff82f21414>] SyS_connect+0x24/0x30 net/socket.c:1538
 [<ffffffff81006d96>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0 arch/x86/entry/common.c:459
 [<ffffffff838c40aa>] sysenter_flags_fixed+0xd/0x17

The buggy address belongs to the object at ffff8800bab66a00
 which belongs to the cache skbuff_fclone_cache of size 456
The buggy address is located 48 bytes inside of
 456-byte region [ffff8800bab66a00, ffff8800bab66bc8)
The buggy address belongs to the page:
kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
BUG: unable to handle kernel paging request at ffff8801d4b65220
IP: [<ffff8801d4b65220>] 0xffff8801d4b65220
PGD 632d067 PUD 80000001c00001e3 
Oops: 0011 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.135-ge75204c #53
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9a41800 task.stack: ffff8801d9a50000
RIP: 0010:[<ffff8801d4b65220>]  [<ffff8801d4b65220>] 0xffff8801d4b65220
RSP: 0018:ffff8801db307f08  EFLAGS: 00010046
RAX: ffff8801d4b65220 RBX: ffff8801d9a57cf8 RCX: 1ffffffff0942999
RDX: 1ffff1003a96ca3c RSI: ffff8801d9a57cf8 RDI: ffff8801d4b65180
RBP: ffff8801db307f70 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8801d9a41800 R12: ffff8801d4b65180
R13: ffff8801d9a57d90 R14: ffff8801d9a50000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8801d4b65220 CR3: 00000000b6141000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff81015b06 ffff8801db307f40 ffff8801db307f58 ffffffff81e6e89b
 0000000000000001 ffffffff83a08cc0 00000000000000a1 0000000000000001
 ffff8801d9a57cf8 00000000000000a1 ffff8801d4b65180 00000000000000a1
Call Trace:
 <IRQ> 
 [<ffffffff838c51d9>] do_IRQ+0x89/0x1c0 arch/x86/kernel/irq.c:239
 [<ffffffff838c32e0>] common_interrupt+0xa0/0xa0 arch/x86/entry/entry_64.S:596
 <EOI> 
 [<ffffffff81025da5>] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline]
 [<ffffffff81025da5>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:290
 [<ffffffff810272f0>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:281
 [<ffffffff8121bc07>] default_idle_call+0x57/0x70 kernel/sched/idle.c:93
 [<ffffffff8121c3af>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
 [<ffffffff8121c3af>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
 [<ffffffff8121c3af>] cpu_startup_entry+0x6af/0x780 kernel/sched/idle.c:301
 [<ffffffff810aa1e4>] start_secondary+0x324/0x400 arch/x86/kernel/smpboot.c:242
Code: 00 00 00 80 d9 ea 02 00 ea ff ff 00 00 00 00 00 00 00 00 e0 9e aa 83 ff ff ff ff 00 6a b6 ba 00 88 ff ff c8 6b b6 ba 00 88 ff ff <60> 52 b6 d4 01 88 ff ff 07 cf 48 81 ff ff ff ff ff ff ff ff ff 
RIP  [<ffff8801d4b65220>] 0xffff8801d4b65220
 RSP <ffff8801db307f08>
CR2: ffff8801d4b65220
---[ end trace 1335b8947e1f1a34 ]---