[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Load/Save RF Kill Switch Status.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.239' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   31.337218] TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
[   31.349259] ==================================================================
[   31.356794] BUG: KASAN: use-after-free in padata_parallel_worker+0x2b0/0x2e0
[   31.364515] Write of size 8 at addr ffff8880b3fe0198 by task kworker/0:0/3
[   31.371510] 
[   31.373132] CPU: 0 PID: 3 Comm: kworker/0:0 Not tainted 4.14.203-syzkaller #0
[   31.380399] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   31.389852] Workqueue: pencrypt padata_parallel_worker
[   31.395122] Call Trace:
[   31.397703]  dump_stack+0x1b2/0x283
[   31.401334]  print_address_description.cold+0x54/0x1d3
[   31.406599]  kasan_report_error.cold+0x8a/0x194
[   31.411259]  ? padata_parallel_worker+0x2b0/0x2e0
[   31.416185]  __asan_report_store8_noabort+0x68/0x70
[   31.421278]  ? padata_parallel_worker+0x2b0/0x2e0
[   31.426125]  padata_parallel_worker+0x2b0/0x2e0
[   31.430797]  ? lock_acquire+0x170/0x3f0
[   31.434763]  ? invoke_padata_reorder+0x40/0x40
[   31.439353]  ? rcu_lockdep_current_cpu_online+0xed/0x140
[   31.444799]  process_one_work+0x793/0x14a0
[   31.449029]  ? work_busy+0x320/0x320
[   31.452742]  ? worker_thread+0x158/0xff0
[   31.456794]  ? _raw_spin_unlock_irq+0x24/0x80
[   31.461281]  worker_thread+0x5cc/0xff0
[   31.465163]  ? rescuer_thread+0xc80/0xc80
[   31.469299]  kthread+0x30d/0x420
[   31.472654]  ? kthread_create_on_node+0xd0/0xd0
[   31.477312]  ret_from_fork+0x24/0x30
[   31.481015] 
[   31.482626] Allocated by task 8026:
[   31.486237]  kasan_kmalloc+0xeb/0x160
[   31.490039]  __kmalloc+0x15a/0x400
[   31.493579]  tls_push_record+0xfa/0x1270
[   31.497622]  tls_sw_sendmsg+0xbb0/0xfd0
[   31.501577]  inet_sendmsg+0x11a/0x4e0
[   31.505362]  sock_sendmsg+0xb5/0x100
[   31.509061]  SyS_sendto+0x1c7/0x2c0
[   31.512849]  do_syscall_64+0x1d5/0x640
[   31.516724]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   31.521896] 
[   31.523510] Freed by task 8026:
[   31.526778]  kasan_slab_free+0xc3/0x1a0
[   31.530737]  kfree+0xc9/0x250
[   31.533828]  tls_push_record+0xc3b/0x1270
[   31.537964]  tls_sw_sendmsg+0xbb0/0xfd0
[   31.541924]  inet_sendmsg+0x11a/0x4e0
[   31.545719]  sock_sendmsg+0xb5/0x100
[   31.549420]  SyS_sendto+0x1c7/0x2c0
[   31.553036]  do_syscall_64+0x1d5/0x640
[   31.556909]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   31.562079] 
[   31.563709] The buggy address belongs to the object at ffff8880b3fe0140
[   31.563709]  which belongs to the cache kmalloc-256 of size 256
[   31.576358] The buggy address is located 88 bytes inside of
[   31.576358]  256-byte region [ffff8880b3fe0140, ffff8880b3fe0240)
[   31.588144] The buggy address belongs to the page:
[   31.593061] page:ffffea0002cff800 count:1 mapcount:0 mapping:ffff8880b3fe0000 index:0x0
[   31.601193] flags: 0xfff00000000100(slab)
[   31.605345] raw: 00fff00000000100 ffff8880b3fe0000 0000000000000000 000000010000000c
[   31.613227] raw: ffffea0002d36d60 ffffea0002cf95a0 ffff88813fe807c0 0000000000000000
[   31.621105] page dumped because: kasan: bad access detected
[   31.626817] 
[   31.628427] Memory state around the buggy address:
[   31.633344]  ffff8880b3fe0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   31.640691]  ffff8880b3fe0100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
[   31.648058] >ffff8880b3fe0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   31.655406]                             ^
[   31.659553]  ffff8880b3fe0200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   31.666900]  ffff8880b3fe0280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   31.674240] ==================================================================
[   31.681581] Disabling lock debugging due to kernel taint
[   31.687126] Kerne