8021q: adding VLAN 0 to HW filter on device batadv0
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
8021q: adding VLAN 0 to HW filter on device batadv0
==================================================================
BUG: KASAN: use-after-free in ccid_hc_tx_delete+0xde/0x100 net/dccp/ccid.c:188
Read of size 8 at addr ffff888089f0ecc0 by task syz-executor.3/8141

CPU: 0 PID: 8141 Comm: syz-executor.3 Not tainted 5.0.0-rc8+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
 ccid_hc_tx_delete+0xde/0x100 net/dccp/ccid.c:188
 dccp_sk_destruct+0x3f/0x90 net/dccp/proto.c:181
 __sk_destruct+0x55/0x6d0 net/core/sock.c:1569
 __rcu_reclaim kernel/rcu/rcu.h:240 [inline]
 rcu_do_batch kernel/rcu/tree.c:2452 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2773 [inline]
 rcu_process_callbacks+0x928/0x1390 kernel/rcu/tree.c:2754
 __do_softirq+0x266/0x95a kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x180/0x1d0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1062
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:48
Code: 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 0f 1f 80 00 00 00 00 b9 00 10 00 00 31 c0 <f3> aa c3 90 90 90 90 90 90 55 48 89 e5 41 57 41 56 41 55 41 54 53
RSP: 0000:ffff888087fe7b78 EFLAGS: 00010246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffff888000000000 RCX: 0000000000000540
RDX: 1ffff110113e9ebe RSI: ffffffff81991926 RDI: ffff88807b1ccac0
RBP: ffff888087fe7b90 R08: ffff888089f4e2c0 R09: 0000000000000000
R10: ffffed1015d05bcf R11: ffff8880ae82de7b R12: ffff888089f4e2c0
R13: 00000000000001cc R14: 000000000000007b R15: 00000000000000f6
 process_huge_page mm/memory.c:4413 [inline]
 clear_huge_page+0xb5/0x4d0 mm/memory.c:4473
 __do_huge_pmd_anonymous_page mm/huge_memory.c:577 [inline]
 do_huge_pmd_anonymous_page+0x73b/0x1550 mm/huge_memory.c:744
 create_huge_pmd mm/memory.c:3678 [inline]
 __handle_mm_fault+0x2daf/0x3f20 mm/memory.c:3882
 handle_mm_fault+0x43f/0xb30 mm/memory.c:3948
 do_user_addr_fault arch/x86/mm/fault.c:1475 [inline]
 __do_page_fault+0x5da/0xd60 arch/x86/mm/fault.c:1541
 do_page_fault+0x71/0x581 arch/x86/mm/fault.c:1572
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1143
RIP: 0033:0x40050c
Code: 01 e9 cd 01 00 00 48 8b 44 24 10 48 0b 44 24 28 75 20 48 8b 14 24 48 8b 7c 24 20 be 02 00 00 00 e8 e9 4b 00 00 48 8b 4c 24 08 <66> 89 01 e9 a1 01 00 00 48 8b 44 24 08 48 8b 14 24 be 02 00 00 00
RSP: 002b:00007ffddcb06420 EFLAGS: 00010206
RAX: 000000000000000a RBX: 000000000073c900 RCX: 000000002047b000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 000000000000000a
RBP: 000000000073c900 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffddcb06520 R11: 0000000000000246 R12: fffffffffffffffe
R13: 0000000000012ab1 R14: 00000000000003e8 R15: 000000000073bf0c

Allocated by task 8128:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_kmalloc mm/kasan/common.c:495 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:468
 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:503
 slab_post_alloc_hook mm/slab.h:440 [inline]
 slab_alloc mm/slab.c:3388 [inline]
 kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3548
 ccid_new+0x256/0x3f0 net/dccp/ccid.c:151
 dccp_hdlr_ccid+0x27/0x150 net/dccp/feat.c:44
 __dccp_feat_activate+0x17a/0x270 net/dccp/feat.c:344
 dccp_feat_activate_values+0x33a/0x766 net/dccp/feat.c:1538
 dccp_rcv_request_sent_state_process net/dccp/input.c:472 [inline]
 dccp_rcv_state_process+0x116f/0x1931 net/dccp/input.c:680
 dccp_v6_do_rcv+0x269/0xbf0 net/dccp/ipv6.c:641
 sk_backlog_rcv include/net/sock.h:936 [inline]
 __release_sock+0x12e/0x3a0 net/core/sock.c:2284
 release_sock+0x59/0x1c0 net/core/sock.c:2800
 inet_wait_for_connect net/ipv4/af_inet.c:588 [inline]
 __inet_stream_connect+0x59f/0xea0 net/ipv4/af_inet.c:680
 inet_stream_connect+0x58/0xa0 net/ipv4/af_inet.c:719
 __sys_connect+0x266/0x330 net/socket.c:1662
 __do_sys_connect net/socket.c:1673 [inline]
 __se_sys_connect net/socket.c:1670 [inline]
 __x64_sys_connect+0x73/0xb0 net/socket.c:1670
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8138:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:457
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:465
 __cache_free mm/slab.c:3494 [inline]
 kmem_cache_free+0x86/0x260 mm/slab.c:3754
 ccid_hc_tx_delete+0xc1/0x100 net/dccp/ccid.c:190
 dccp_hdlr_ccid+0x7d/0x150 net/dccp/feat.c:53
 __dccp_feat_activate+0x17a/0x270 net/dccp/feat.c:344
 dccp_feat_activate_values+0x33a/0x766 net/dccp/feat.c:1538
 dccp_create_openreq_child+0x40c/0x570 net/dccp/minisocks.c:127
 dccp_v6_request_recv_sock+0x214/0x1da0 net/dccp/ipv6.c:469
 dccp_check_req+0x35c/0x6f0 net/dccp/minisocks.c:196
 dccp_v6_rcv+0x6d7/0x191e net/dccp/ipv6.c:747
 ip6_protocol_deliver_rcu+0x303/0x16c0 net/ipv6/ip6_input.c:394
 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:434
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:443
 dst_input include/net/dst.h:450 [inline]
 ip6_rcv_finish+0x1e7/0x320 net/ipv6/ip6_input.c:76
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 ipv6_rcv+0x10e/0x420 net/ipv6/ip6_input.c:272
 __netif_receive_skb_one_core+0x115/0x1a0 net/core/dev.c:4973
 __netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083
 process_backlog+0x206/0x750 net/core/dev.c:5923
 napi_poll net/core/dev.c:6346 [inline]
 net_rx_action+0x4fa/0x1070 net/core/dev.c:6412
 __do_softirq+0x266/0x95a kernel/softirq.c:292

The buggy address belongs to the object at ffff888089f0ecc0
 which belongs to the cache ccid2_hc_tx_sock of size 1240
The buggy address is located 0 bytes inside of
 1240-byte region [ffff888089f0ecc0, ffff888089f0f198)
The buggy address belongs to the page:
page:ffffea000227c380 count:1 mapcount:0 mapping:ffff888216701180 index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea000228ea08 ffffea000228ce08 ffff888216701180
raw: 0000000000000000 ffff888089f0e1c0 0000000100000005 0000000000000000
kobject: 'loop1' (0000000048d00feb): kobject_uevent_env
page dumped because: kasan: bad access detected
kobject: 'loop1' (0000000048d00feb): fill_kobj_path: path = '/devices/virtual/block/loop1'

Memory state around the buggy address:
 ffff888089f0eb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888089f0ec00: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888089f0ec80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                           ^
 ffff888089f0ed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888089f0ed80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================