[  OK  ] Reached target Login Prompts.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.201' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   76.735113][   T26] audit: type=1400 audit(1601902041.113:8): avc:  denied  { execmem } for  pid=6875 comm="syz-executor795" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
[   76.742325][ T6876] netlink: 32 bytes leftover after parsing attributes in process `syz-executor795'.
[   76.797609][ T6876] ==================================================================
[   76.805784][ T6876] BUG: KASAN: use-after-free in tcf_action_destroy+0x188/0x1b0
[   76.813403][ T6876] Read of size 8 at addr ffff88809ee75400 by task syz-executor795/6876
[   76.821623][ T6876] 
[   76.823952][ T6876] CPU: 1 PID: 6876 Comm: syz-executor795 Not tainted 5.9.0-rc8-syzkaller #0
[   76.832610][ T6876] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   76.842818][ T6876] Call Trace:
[   76.846110][ T6876]  dump_stack+0x198/0x1fd
[   76.850424][ T6876]  ? tcf_action_destroy+0x188/0x1b0
[   76.855607][ T6876]  ? tcf_action_destroy+0x188/0x1b0
[   76.860814][ T6876]  print_address_description.constprop.0.cold+0xae/0x497
[   76.867819][ T6876]  ? tcf_action_destroy+0x188/0x1b0
[   76.873015][ T6876]  ? lockdep_hardirqs_off+0x96/0xd0
[   76.878215][ T6876]  ? vprintk_func+0x95/0x1d4
[   76.882791][ T6876]  ? tcf_action_destroy+0x188/0x1b0
[   76.887968][ T6876]  ? tcf_action_destroy+0x188/0x1b0
[   76.894373][ T6876]  kasan_report.cold+0x1f/0x37
[   76.899152][ T6876]  ? tcf_action_destroy+0x188/0x1b0
[   76.904332][ T6876]  tcf_action_destroy+0x188/0x1b0
[   76.909340][ T6876]  tcf_action_init+0x29c/0x3d0
[   76.914087][ T6876]  ? tcf_action_init_1+0xac0/0xac0
[   76.919196][ T6876]  ? avc_has_perm_noaudit+0x1ee/0x390
[   76.924548][ T6876]  tcf_action_add+0xd9/0x360
[   76.929135][ T6876]  ? tca_action_gd+0xe20/0xe20
[   76.933898][ T6876]  ? bpf_lsm_capable+0x5/0x10
[   76.938556][ T6876]  ? __nla_parse+0x3d/0x4a
[   76.942972][ T6876]  tc_ctl_action+0x33a/0x439
[   76.947546][ T6876]  ? tcf_action_add+0x360/0x360
[   76.952383][ T6876]  ? lock_is_held_type+0xbb/0xf0
[   76.957305][ T6876]  ? tcf_action_add+0x360/0x360
[   76.962131][ T6876]  rtnetlink_rcv_msg+0x44e/0xad0
[   76.967050][ T6876]  ? rtnetlink_put_metrics+0x510/0x510
[   76.972488][ T6876]  ? lock_acquire+0x1f3/0xaf0
[   76.977144][ T6876]  ? netlink_deliver_tap+0x146/0xb70
[   76.982411][ T6876]  netlink_rcv_skb+0x15a/0x430
[   76.987159][ T6876]  ? rtnetlink_put_metrics+0x510/0x510
[   76.992614][ T6876]  ? netlink_ack+0xa10/0xa10
[   76.997196][ T6876]  netlink_unicast+0x533/0x7d0
[   77.001941][ T6876]  ? netlink_attachskb+0x810/0x810
[   77.007036][ T6876]  netlink_sendmsg+0x856/0xd90
[   77.011780][ T6876]  ? netlink_unicast+0x7d0/0x7d0
[   77.016789][ T6876]  ? bpf_lsm_socket_sendmsg+0x5/0x10
[   77.022056][ T6876]  ? netlink_unicast+0x7d0/0x7d0
[   77.026976][ T6876]  sock_sendmsg+0xcf/0x120
[   77.031373][ T6876]  ____sys_sendmsg+0x6e8/0x810
[   77.036130][ T6876]  ? kernel_sendmsg+0x50/0x50
[   77.040793][ T6876]  ? do_recvmmsg+0x6d0/0x6d0
[   77.045365][ T6876]  ? lockdep_hardirqs_on_prepare+0x530/0x530
[   77.051322][ T6876]  ? lock_is_held_type+0xbb/0xf0
[   77.056253][ T6876]  ? find_held_lock+0x2d/0x110
[   77.060996][ T6876]  ___sys_sendmsg+0xf3/0x170
[   77.065567][ T6876]  ? sendmsg_copy_msghdr+0x160/0x160
[   77.070844][ T6876]  ? __fget_files+0x272/0x400
[   77.075515][ T6876]  ? lock_downgrade+0x830/0x830
[   77.080349][ T6876]  ? do_huge_pmd_anonymous_page+0x8f2/0x2200
[   77.086321][ T6876]  ? __fget_files+0x294/0x400
[   77.090981][ T6876]  ? __fget_light+0xea/0x280
[   77.095568][ T6876]  __sys_sendmsg+0xe5/0x1b0
[   77.100063][ T6876]  ? __sys_sendmsg_sock+0xb0/0xb0
[   77.105075][ T6876]  ? check_preemption_disabled+0x50/0x130
[   77.110817][ T6876]  ? syscall_enter_from_user_mode+0x1d/0x60
[   77.116826][ T6876]  do_syscall_64+0x2d/0x70
[   77.121243][ T6876]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   77.127114][ T6876] RIP: 0033:0x445d79
[   77.130988][ T6876] Code: e8 bc b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 ab 11 fc ff c3 66 2e 0f 1f 84 00 00 00 00
[   77.150587][ T6876] RSP: 002b:00007f6a74b28d98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   77.158979][ T6876] RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 0000000000445d79
[   77.166931][ T6876] RDX: 0000000000000000 RSI: 0000000020002980 RDI: 0000000000000003
[   77.174882][ T6876] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000
[   77.182842][ T6876] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac2c
[   77.190796][ T6876] R13: 0001008400000000 R14: 0000000000000000 R15: 053b003000000098
[   77.198763][ T6876] 
[   77.201081][ T6876] Allocated by task 6876:
[   77.205391][ T6876]  kasan_save_stack+0x1b/0x40
[   77.210064][ T6876]  __kasan_kmalloc.constprop.0+0xbf/0xd0
[   77.215672][ T6876]  __kmalloc+0x1b0/0x360
[   77.219892][ T6876]  tcf_idr_create+0x5b/0x800
[   77.224457][ T6876]  tcf_connmark_init+0x535/0x960
[   77.229373][ T6876]  tcf_action_init_1+0x6a5/0xac0
[   77.234286][ T6876]  tcf_action_init+0x260/0x3d0
[   77.239026][ T6876]  tcf_action_add+0xd9/0x360
[   77.243594][ T6876]  tc_ctl_action+0x33a/0x439
[   77.248173][ T6876]  rtnetlink_rcv_msg+0x44e/0xad0
[   77.253087][ T6876]  netlink_rcv_skb+0x15a/0x430
[   77.257832][ T6876]  netlink_unicast+0x533/0x7d0
[   77.262572][ T6876]  netlink_sendmsg+0x856/0xd90
[   77.267313][ T6876]  sock_sendmsg+0xcf/0x120
[   77.271718][ T6876]  ____sys_sendmsg+0x6e8/0x810
[   77.276479][ T6876]  ___sys_sendmsg+0xf3/0x170
[   77.281046][ T6876]  __sys_sendmsg+0xe5/0x1b0
[   77.285528][ T6876]  do_syscall_64+0x2d/0x70
[   77.289964][ T6876]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   77.295859][ T6876] 
[   77.298166][ T6876] Freed by task 6878:
[   77.302140][ T6876]  kasan_save_stack+0x1b/0x40
[   77.306809][ T6876]  kasan_set_track+0x1c/0x30
[   77.311464][ T6876]  kasan_set_free_info+0x1b/0x30
[   77.316397][ T6876]  __kasan_slab_free+0xd8/0x120
[   77.321223][ T6876]  kfree+0x10e/0x2b0
[   77.325101][ T6876]  tcf_generic_walker+0x959/0xb60
[   77.330104][ T6876]  tca_action_flush+0x42b/0x920
[   77.334930][ T6876]  tca_action_gd+0x8c9/0xe20
[   77.339498][ T6876]  tc_ctl_action+0x280/0x439
[   77.344081][ T6876]  rtnetlink_rcv_msg+0x44e/0xad0
[   77.348996][ T6876]  netlink_rcv_skb+0x15a/0x430
[   77.353750][ T6876]  netlink_unicast+0x533/0x7d0
[   77.358491][ T6876]  netlink_sendmsg+0x856/0xd90
[   77.363234][ T6876]  sock_sendmsg+0xcf/0x120
[   77.367642][ T6876]  ____sys_sendmsg+0x6e8/0x810
[   77.372396][ T6876]  ___sys_sendmsg+0xf3/0x170
[   77.376962][ T6876]  __sys_sendmsg+0xe5/0x1b0
[   77.381459][ T6876]  do_syscall_64+0x2d/0x70
[   77.385854][ T6876]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   77.391715][ T6876] 
[   77.394030][ T6876] The buggy address belongs to the object at ffff88809ee75400
[   77.394030][ T6876]  which belongs to the cache kmalloc-512 of size 512
[   77.408076][ T6876] The buggy address is located 0 bytes inside of
[   77.408076][ T6876]  512-byte region [ffff88809ee75400, ffff88809ee75600)
[   77.421162][ T6876] The buggy address belongs to the page:
[   77.426775][ T6876] page:000000004cb01f57 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9ee75
[   77.436896][ T6876] flags: 0xfffe0000000200(slab)
[   77.441725][ T6876] raw: 00fffe0000000200 ffffea000287eec8 ffffea0002974108 ffff8880aa040600
[   77.450305][ T6876] raw: 0000000000000000 ffff88809ee75000 0000000100000004 0000000000000000
[   77.458878][ T6876] page dumped because: kasan: bad access detected
[   77.465301][ T6876] 
[   77.467607][ T6876] Memory state around the buggy address:
[   77.473215][ T6876]  ffff88809ee75300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   77.481253][ T6876]  ffff88809ee75380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   77.489292][ T6876] >ffff88809ee75400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   77.497341][ T6876]                    ^
[   77.501399][ T6876]  ffff88809ee75480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   77.509436][ T6876]  ffff88809ee75500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   77.517484][ T6876] ==================================================================
[   77.525518][ T6876] Disabling lock debugging due to kernel taint
[   77.545695][ T6876] Kernel panic - not syncing: panic_on_warn set ...
[   77.552309][ T6876] CPU: 1 PID: 6876 Comm: syz-executor795 Tainted: G    B             5.9.0-rc8-syzkaller #0
[   77.562359][ T6876] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   77.572494][ T6876] Call Trace:
[   77.575784][ T6876]  dump_stack+0x198/0x1fd
[   77.580108][ T6876]  ? tcf_action_destroy+0x130/0x1b0
[   77.585296][ T6876]  panic+0x382/0x7fb
[   77.589197][ T6876]  ? __warn_printk+0xf3/0xf3
[   77.593761][ T6876]  ? preempt_schedule_common+0x59/0xc0
[   77.599197][ T6876]  ? tcf_action_destroy+0x188/0x1b0
[   77.604370][ T6876]  ? preempt_schedule_thunk+0x16/0x18
[   77.609717][ T6876]  ? trace_hardirqs_on+0x55/0x220
[   77.614741][ T6876]  ? tcf_action_destroy+0x188/0x1b0
[   77.619917][ T6876]  ? tcf_action_destroy+0x188/0x1b0
[   77.625096][ T6876]  end_report+0x4d/0x53
[   77.629240][ T6876]  kasan_report.cold+0xd/0x37
[   77.633897][ T6876]  ? tcf_action_destroy+0x188/0x1b0
[   77.639070][ T6876]  tcf_action_destroy+0x188/0x1b0
[   77.644067][ T6876]  tcf_action_init+0x29c/0x3d0
[   77.648809][ T6876]  ? tcf_action_init_1+0xac0/0xac0
[   77.653902][ T6876]  ? avc_has_perm_noaudit+0x1ee/0x390
[   77.659250][ T6876]  tcf_action_add+0xd9/0x360
[   77.663818][ T6876]  ? tca_action_gd+0xe20/0xe20
[   77.668596][ T6876]  ? bpf_lsm_capable+0x5/0x10
[   77.673246][ T6876]  ? __nla_parse+0x3d/0x4a
[   77.677636][ T6876]  tc_ctl_action+0x33a/0x439
[   77.682202][ T6876]  ? tcf_action_add+0x360/0x360
[   77.687029][ T6876]  ? lock_is_held_type+0xbb/0xf0
[   77.691948][ T6876]  ? tcf_action_add+0x360/0x360
[   77.696773][ T6876]  rtnetlink_rcv_msg+0x44e/0xad0
[   77.701687][ T6876]  ? rtnetlink_put_metrics+0x510/0x510
[   77.707136][ T6876]  ? lock_acquire+0x1f3/0xaf0
[   77.711790][ T6876]  ? netlink_deliver_tap+0x146/0xb70
[   77.717057][ T6876]  netlink_rcv_skb+0x15a/0x430
[   77.721813][ T6876]  ? rtnetlink_put_metrics+0x510/0x510
[   77.727246][ T6876]  ? netlink_ack+0xa10/0xa10
[   77.731810][ T6876]  netlink_unicast+0x533/0x7d0
[   77.736547][ T6876]  ? netlink_attachskb+0x810/0x810
[   77.741631][ T6876]  netlink_sendmsg+0x856/0xd90
[   77.746388][ T6876]  ? netlink_unicast+0x7d0/0x7d0
[   77.751300][ T6876]  ? bpf_lsm_socket_sendmsg+0x5/0x10
[   77.756572][ T6876]  ? netlink_unicast+0x7d0/0x7d0
[   77.761497][ T6876]  sock_sendmsg+0xcf/0x120
[   77.765891][ T6876]  ____sys_sendmsg+0x6e8/0x810
[   77.770628][ T6876]  ? kernel_sendmsg+0x50/0x50
[   77.775287][ T6876]  ? do_recvmmsg+0x6d0/0x6d0
[   77.779855][ T6876]  ? lockdep_hardirqs_on_prepare+0x530/0x530
[   77.785822][ T6876]  ? lock_is_held_type+0xbb/0xf0
[   77.790733][ T6876]  ? find_held_lock+0x2d/0x110
[   77.795471][ T6876]  ___sys_sendmsg+0xf3/0x170
[   77.800048][ T6876]  ? sendmsg_copy_msghdr+0x160/0x160
[   77.805480][ T6876]  ? __fget_files+0x272/0x400
[   77.810135][ T6876]  ? lock_downgrade+0x830/0x830
[   77.814962][ T6876]  ? do_huge_pmd_anonymous_page+0x8f2/0x2200
[   77.820914][ T6876]  ? __fget_files+0x294/0x400
[   77.825571][ T6876]  ? __fget_light+0xea/0x280
[   77.830150][ T6876]  __sys_sendmsg+0xe5/0x1b0
[   77.834626][ T6876]  ? __sys_sendmsg_sock+0xb0/0xb0
[   77.839628][ T6876]  ? check_preemption_disabled+0x50/0x130
[   77.845333][ T6876]  ? syscall_enter_from_user_mode+0x1d/0x60
[   77.851200][ T6876]  do_syscall_64+0x2d/0x70
[   77.855589][ T6876]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   77.861452][ T6876] RIP: 0033:0x445d79
[   77.865323][ T6876] Code: e8 bc b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 ab 11 fc ff c3 66 2e 0f 1f 84 00 00 00 00
[   77.884905][ T6876] RSP: 002b:00007f6a74b28d98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   77.893297][ T6876] RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 0000000000445d79
[   77.901241][ T6876] RDX: 0000000000000000 RSI: 0000000020002980 RDI: 0000000000000003
[   77.909198][ T6876] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000
[   77.917143][ T6876] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac2c
[   77.925097][ T6876] R13: 0001008400000000 R14: 0000000000000000 R15: 053b003000000098
[   77.934169][ T6876] Kernel Offset: disabled
[   77.938483][ T6876] Rebooting in 86400 seconds..