==================================================================
BUG: KASAN: use-after-free in tcp_skb_pcount include/net/tcp.h:798 [inline]
BUG: KASAN: use-after-free in tcp_init_tso_segs net/ipv4/tcp_output.c:1631 [inline]
BUG: KASAN: use-after-free in tcp_write_xmit+0x3b22/0x4680 net/ipv4/tcp_output.c:2068
Read of size 2 at addr ffff8801cf32f430 by task syz-executor5/9324

CPU: 1 PID: 9324 Comm: syz-executor5 Not tainted 4.4.164+ #123
 0000000000000000 c6381356c2d340a2 ffff8801d222f870 ffffffff81aa5d4d
 ffffea00073ccb80 ffff8801cf32f430 0000000000000000 ffff8801cf32f430
 dffffc0000000000 ffff8801d222f8a8 ffffffff8148b2eb ffff8801cf32f430
Call Trace:
 [<ffffffff81aa5d4d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81aa5d4d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8148b2eb>] print_address_description+0x6c/0x217 mm/kasan/report.c:252
 [<ffffffff8148b60b>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8148b60b>] kasan_report.cold.6+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814802f4>] __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:427
 [<ffffffff82430a32>] tcp_skb_pcount include/net/tcp.h:798 [inline]
 [<ffffffff82430a32>] tcp_init_tso_segs net/ipv4/tcp_output.c:1631 [inline]
 [<ffffffff82430a32>] tcp_write_xmit+0x3b22/0x4680 net/ipv4/tcp_output.c:2068
 [<ffffffff82431e24>] __tcp_push_pending_frames+0xa4/0x2a0 net/ipv4/tcp_output.c:2319
 [<ffffffff823e79a2>] tcp_push+0x3e2/0x5a0 net/ipv4/tcp.c:692
 [<ffffffff823f6434>] tcp_sendmsg+0x16b4/0x2b30 net/ipv4/tcp.c:1293
 [<ffffffff824a2eb3>] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:755
 [<ffffffff821d00db>] sock_sendmsg_nosec net/socket.c:638 [inline]
 [<ffffffff821d00db>] sock_sendmsg+0xbb/0x110 net/socket.c:648
 [<ffffffff821d4300>] SYSC_sendto net/socket.c:1678 [inline]
 [<ffffffff821d4300>] SyS_sendto+0x220/0x370 net/socket.c:1646
 [<ffffffff82713e61>] entry_SYSCALL_64_fastpath+0x1e/0x9a

Allocated by task 9324:
 [<ffffffff8102e566>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff8147f372>] save_stack mm/kasan/kasan.c:512 [inline]
 [<ffffffff8147f372>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff8147f372>] kasan_kmalloc.part.1+0x62/0xf0 mm/kasan/kasan.c:616
 [<ffffffff8147f5ef>] kasan_kmalloc+0xaf/0xc0 mm/kasan/kasan.c:601
 [<ffffffff8147fbb2>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:554
 [<ffffffff8147b2ac>] slab_post_alloc_hook mm/slub.c:1349 [inline]
 [<ffffffff8147b2ac>] slab_alloc_node mm/slub.c:2615 [inline]
 [<ffffffff8147b2ac>] slab_alloc mm/slub.c:2623 [inline]
 [<ffffffff8147b2ac>] kmem_cache_alloc+0xdc/0x2c0 mm/slub.c:2628
 [<ffffffff821ef646>] kmem_cache_alloc_node include/linux/slab.h:350 [inline]
 [<ffffffff821ef646>] __alloc_skb+0xe6/0x5b0 net/core/skbuff.c:218
 [<ffffffff823f3073>] alloc_skb_fclone include/linux/skbuff.h:856 [inline]
 [<ffffffff823f3073>] sk_stream_alloc_skb+0xa3/0x5d0 net/ipv4/tcp.c:833
 [<ffffffff823f5d01>] tcp_sendmsg+0xf81/0x2b30 net/ipv4/tcp.c:1178
 [<ffffffff824a2eb3>] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:755
 [<ffffffff821d00db>] sock_sendmsg_nosec net/socket.c:638 [inline]
 [<ffffffff821d00db>] sock_sendmsg+0xbb/0x110 net/socket.c:648
 [<ffffffff821d4300>] SYSC_sendto net/socket.c:1678 [inline]
 [<ffffffff821d4300>] SyS_sendto+0x220/0x370 net/socket.c:1646
 [<ffffffff82713e61>] entry_SYSCALL_64_fastpath+0x1e/0x9a

Freed by task 9326:
 [<ffffffff8102e566>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff8147fc6c>] save_stack mm/kasan/kasan.c:512 [inline]
 [<ffffffff8147fc6c>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff8147fc6c>] kasan_slab_free+0xac/0x190 mm/kasan/kasan.c:589
 [<ffffffff8147c96e>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff8147c96e>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff8147c96e>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff8147c96e>] kmem_cache_free+0xbe/0x350 mm/slub.c:2881
 [<ffffffff821e7b0f>] kfree_skbmem+0xcf/0x100 net/core/skbuff.c:635
 [<ffffffff821f4ead>] __kfree_skb+0x1d/0x20 net/core/skbuff.c:676
 [<ffffffff82432be9>] sk_wmem_free_skb include/net/sock.h:1447 [inline]
 [<ffffffff82432be9>] tcp_write_queue_purge include/net/tcp.h:1460 [inline]
 [<ffffffff82432be9>] tcp_connect_init net/ipv4/tcp_output.c:3134 [inline]
 [<ffffffff82432be9>] tcp_connect+0xae9/0x3110 net/ipv4/tcp_output.c:3273
 [<ffffffff82440af1>] tcp_v4_connect+0xf31/0x1890 net/ipv4/tcp_ipv4.c:246
 [<ffffffff824a1dc9>] __inet_stream_connect+0x2a9/0xc30 net/ipv4/af_inet.c:615
 [<ffffffff824a27a5>] inet_stream_connect+0x55/0xa0 net/ipv4/af_inet.c:676
 [<ffffffff821d3a68>] SYSC_connect net/socket.c:1570 [inline]
 [<ffffffff821d3a68>] SyS_connect+0x1b8/0x310 net/socket.c:1551
 [<ffffffff82713e61>] entry_SYSCALL_64_fastpath+0x1e/0x9a

The buggy address belongs to the object at ffff8801cf32f400
 which belongs to the cache skbuff_fclone_cache of size 456
The buggy address is located 48 bytes inside of
 456-byte region [ffff8801cf32f400, ffff8801cf32f5c8)
The buggy address belongs to the page:
BUG: unable to handle kernel paging request at fffffffe142e2a80
IP: [<ffffffff811f16c5>] cpuacct_charge+0x155/0x380 kernel/sched/cpuacct.c:247
PGD 2e0d067 PUD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.164+ #123
task: ffffffff82e151c0 task.stack: ffffffff82e00000
RIP: 0010:[<ffffffff811f16c5>]  [<ffffffff811f16c5>] cpuacct_charge+0x155/0x380 kernel/sched/cpuacct.c:247
RSP: 0018:ffff8801db607998  EFLAGS: 00010046
RAX: 1ffffffff05d2a0b RBX: 00000000000181a8 RCX: ffffffff831a2800
RDX: fffffbffc285c550 RSI: fffffffe142e2a80 RDI: ffffffff82e95058
RBP: ffff8801db6079d8 R08: ffffffff82e15a88 R09: 1ffffffff05c2b64
R10: ffffffff82835d40 R11: ffffffff831a2c38 R12: ffffffff82e94f80
R13: dffffc0000000000 R14: 0000000020c87768 R15: ffffffffd2228050
FS:  0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffe142e2a80 CR3: 00000000b96c6000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff811f15d0 0000000000000046 0000000000000003 ffff8800a7000060
 ffff8800a7000000 0000000020c87768 ffff8800a70000b0 0000000000000000
 ffff8801db607a20 ffffffff8117ccc9 ffffffff82c48550 ffffffff811fc710
Call Trace:
 <IRQ> 
 [<ffffffff8117ccc9>] update_curr+0x2c9/0x6d0 kernel/sched/fair.c:882
 [<ffffffff8119c91a>] enqueue_entity kernel/sched/fair.c:3512 [inline]
 [<ffffffff8119c91a>] enqueue_task_fair+0x12a/0xab90 kernel/sched/fair.c:4711
 [<ffffffff8116439d>] enqueue_task kernel/sched/core.c:858 [inline]
 [<ffffffff8116439d>] activate_task+0x1dd/0x280 kernel/sched/core.c:874
 [<ffffffff8116558f>] ttwu_activate kernel/sched/core.c:1736 [inline]
 [<ffffffff8116558f>] ttwu_do_activate.constprop.29+0xbf/0x1e0 kernel/sched/core.c:1789
 [<ffffffff81168a2d>] ttwu_queue kernel/sched/core.c:1934 [inline]
 [<ffffffff81168a2d>] try_to_wake_up+0x6dd/0x1120 kernel/sched/core.c:2068
 [<ffffffff811695b5>] wake_up_process+0x15/0x20 kernel/sched/core.c:2142
 [<ffffffff8111ec65>] wake_up_worker kernel/workqueue.c:846 [inline]
 [<ffffffff8111ec65>] insert_work+0x225/0x300 kernel/workqueue.c:1318
 [<ffffffff8112080c>] __queue_work+0x3dc/0xea0 kernel/workqueue.c:1433
 [<ffffffff81126388>] delayed_work_timer_fn+0x68/0x90 kernel/workqueue.c:1472
 [<ffffffff812559bc>] call_timer_fn+0x18c/0x870 kernel/time/timer.c:1185
 [<ffffffff81256584>] __run_timers kernel/time/timer.c:1257 [inline]
 [<ffffffff81256584>] run_timer_softirq+0x4e4/0xbb0 kernel/time/timer.c:1444
 [<ffffffff82716d6a>] __do_softirq+0x22a/0xa3e kernel/softirq.c:273
 [<ffffffff810e269d>] invoke_softirq kernel/softirq.c:350 [inline]
 [<ffffffff810e269d>] irq_exit+0x10d/0x140 kernel/softirq.c:391
 [<ffffffff827164c1>] exiting_irq arch/x86/include/asm/apic.h:652 [inline]
 [<ffffffff827164c1>] smp_apic_timer_interrupt+0x81/0xb0 arch/x86/kernel/apic/apic.c:926
 [<ffffffff8271581d>] apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:741
 <EOI> 
 [<ffffffff81020d65>] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline]
 [<ffffffff81020d65>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:432
 [<ffffffff81022f90>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:423
 [<ffffffff811e8537>] default_idle_call+0x57/0x70 kernel/sched/idle.c:93
 [<ffffffff811e894a>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
 [<ffffffff811e894a>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
 [<ffffffff811e894a>] cpu_startup_entry+0x31a/0x7a0 kernel/sched/idle.c:301
 [<ffffffff82700ad1>] rest_init+0x188/0x18e init/main.c:410
 [<ffffffff831d2875>] start_kernel+0x62c/0x660 init/main.c:682
 [<ffffffff831d130f>] x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:196
 [<ffffffff831d144b>] x86_64_start_kernel+0x13a/0x15d arch/x86/kernel/head64.c:185
Code: 49 8d bc 24 d8 00 00 00 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 c4 01 00 00 49 8b 9c 24 d8 00 00 00 80 3a 00 0f 85 8f 01 00 00 <4a> 03 1c f9 48 89 d8 48 c1 e8 03 42 80 3c 28 00 0f 85 be 01 00 
RIP  [<ffffffff811f16c5>] cpuacct_charge+0x155/0x380 kernel/sched/cpuacct.c:247
 RSP <ffff8801db607998>
CR2: fffffffe142e2a80
---[ end trace 627c83d7e88241d3 ]---