audit: type=1400 audit(1599283372.934:8): avc:  denied  { execmem } for  pid=6352 comm="syz-executor098" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
==================================================================
BUG: KASAN: use-after-free in list_replace include/linux/list.h:141 [inline]
BUG: KASAN: use-after-free in list_replace_init include/linux/list.h:149 [inline]
BUG: KASAN: use-after-free in padata_parallel_worker+0x2b0/0x2e0 kernel/padata.c:76
Write of size 8 at addr ffff88808c49c498 by task kworker/0:2/2582

CPU: 0 PID: 2582 Comm: kworker/0:2 Not tainted 4.14.196-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: pencrypt padata_parallel_worker
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_store8_noabort+0x68/0x70 mm/kasan/report.c:435
 list_replace include/linux/list.h:141 [inline]
 list_replace_init include/linux/list.h:149 [inline]
 padata_parallel_worker+0x2b0/0x2e0 kernel/padata.c:76
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Allocated by task 6352:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15a/0x400 mm/slab.c:3729
 kmalloc include/linux/slab.h:493 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 tls_push_record+0xfa/0x1270 net/tls/tls_sw.c:250
 tls_sw_sendmsg+0xbb0/0xfd0 net/tls/tls_sw.c:457
 inet_sendmsg+0x11a/0x4e0 net/ipv4/af_inet.c:762
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 SYSC_sendto net/socket.c:1763 [inline]
 SyS_sendto+0x1c7/0x2c0 net/socket.c:1731
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 6352:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 tls_push_record+0xc3b/0x1270 net/tls/tls_sw.c:293
 tls_sw_sendmsg+0xbb0/0xfd0 net/tls/tls_sw.c:457
 inet_sendmsg+0x11a/0x4e0 net/ipv4/af_inet.c:762
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 SYSC_sendto net/socket.c:1763 [inline]
 SyS_sendto+0x1c7/0x2c0 net/socket.c:1731
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff88808c49c440
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 88 bytes inside of
 256-byte region [ffff88808c49c440, ffff88808c49c540)
The buggy address belongs to the page:
page:ffffea0002312700 count:1 mapcount:0 mapping:ffff88808c49c080 index:0xffff88808c49c6c0
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffff88808c49c080 ffff88808c49c6c0 0000000100000008
raw: ffffea0002312ca0 ffffea00027ef520 ffff88812fe527c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808c49c380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88808c49c400: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff88808c49c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff88808c49c500: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88808c49c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================