Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 629.500279][ T26] audit: type=1400 audit(1602072181.842:8): avc: denied { execmem } for pid=6887 comm="syz-executor733" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 629.518209][ T6888] IPVS: ftp: loaded support on port[0] = 21 executing program [ 629.565354][ T6910] netlink: 388 bytes leftover after parsing attributes in process `syz-executor733'. [ 629.585275][ T6911] netlink: 388 bytes leftover after parsing attributes in process `syz-executor733'. [ 904.928929][ T1175] INFO: task kworker/0:1:6880 blocked for more than 143 seconds. [ 904.936869][ T1175] Not tainted 5.9.0-rc8-syzkaller #0 [ 904.946474][ T1175] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 904.956097][ T1175] task:kworker/0:1 state:D stack:29856 pid: 6880 ppid: 2 flags:0x00004000 [ 904.966384][ T1175] Workqueue: ipv6_addrconf addrconf_verify_work [ 904.973641][ T1175] Call Trace: [ 904.976991][ T1175] __schedule+0xec9/0x2280 [ 904.982771][ T1175] ? io_schedule_timeout+0x140/0x140 [ 904.988080][ T1175] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 904.995560][ T1175] ? _raw_spin_unlock_irq+0x1f/0x80 [ 905.001771][ T1175] ? lockdep_hardirqs_on+0x53/0x100 [ 905.006997][ T1175] schedule+0xd0/0x2a0 [ 905.012533][ T1175] schedule_preempt_disabled+0xf/0x20 [ 905.017920][ T1175] __mutex_lock+0x3e2/0x10e0 [ 905.023945][ T1175] ? addrconf_verify_work+0xa/0x20 [ 905.030023][ T1175] ? mutex_lock_io_nested+0xf60/0xf60 [ 905.035422][ T1175] ? lock_release+0x8f0/0x8f0 [ 905.041536][ T1175] ? lock_downgrade+0x830/0x830 [ 905.046407][ T1175] ? _raw_spin_unlock_irq+0x1f/0x80 [ 905.053277][ T1175] ? lock_is_held_type+0xbb/0xf0 [ 905.060427][ T1175] addrconf_verify_work+0xa/0x20 [ 905.065381][ T1175] process_one_work+0x94c/0x1670 [ 905.072885][ T1175] ? lock_release+0x8f0/0x8f0 [ 905.077586][ T1175] ? pwq_dec_nr_in_flight+0x320/0x320 [ 905.084334][ T1175] ? rwlock_bug.part.0+0x90/0x90 [ 905.090256][ T1175] ? lockdep_hardirqs_off+0x96/0xd0 [ 905.095493][ T1175] worker_thread+0x64c/0x1120 [ 905.101626][ T1175] ? __kthread_parkme+0x13f/0x1e0 [ 905.106669][ T1175] ? process_one_work+0x1670/0x1670 [ 905.113373][ T1175] kthread+0x3b5/0x4a0 [ 905.117457][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 905.125083][ T1175] ret_from_fork+0x1f/0x30 [ 905.130585][ T1175] [ 905.130585][ T1175] Showing all locks held in the system: [ 905.138318][ T1175] 1 lock held by khungtaskd/1175: [ 905.144960][ T1175] #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 905.156761][ T1175] 1 lock held by in:imklog/6560: [ 905.162577][ T1175] #0: ffff8880a868a1b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 905.172656][ T1175] 3 locks held by kworker/0:1/6880: [ 905.177853][ T1175] #0: ffff8880a90ca538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 905.190308][ T1175] #1: ffffc90001907da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 905.202914][ T1175] #2: ffffffff8b150948 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 905.213332][ T1175] 1 lock held by syz-executor733/6911: [ 905.219698][ T1175] [ 905.222029][ T1175] ============================================= [ 905.222029][ T1175] [ 905.231856][ T1175] NMI backtrace for cpu 0 [ 905.236203][ T1175] CPU: 0 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 905.244435][ T1175] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 905.254487][ T1175] Call Trace: [ 905.257857][ T1175] dump_stack+0x198/0x1fd [ 905.262247][ T1175] nmi_cpu_backtrace.cold+0x70/0xb1 [ 905.267538][ T1175] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 905.273179][ T1175] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 905.279164][ T1175] watchdog+0xd7d/0x1000 [ 905.283412][ T1175] ? reset_hung_task_detector+0x30/0x30 [ 905.288963][ T1175] kthread+0x3b5/0x4a0 [ 905.293054][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 905.298172][ T1175] ret_from_fork+0x1f/0x30 [ 905.302809][ T1175] Sending NMI from CPU 0 to CPUs 1: [ 905.309436][ C1] NMI backtrace for cpu 1 [ 905.309443][ C1] CPU: 1 PID: 6911 Comm: syz-executor733 Not tainted 5.9.0-rc8-syzkaller #0 [ 905.309450][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 905.309454][ C1] RIP: 0010:find_held_lock+0xe3/0x110 [ 905.309466][ C1] Code: 45 31 e4 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 0f b6 14 02 4c 89 f0 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 11 5b <45> 89 3e 4c 89 e0 5d 41 5c 41 5d 41 5e 41 5f c3 4c 89 f7 e8 e5 29 [ 905.309471][ C1] RSP: 0018:ffffc90001666c50 EFLAGS: 00000097 [ 905.309480][ C1] RAX: 0000000000000003 RBX: 0000000000000002 RCX: ffffc90001666cd0 [ 905.309485][ C1] RDX: 0000000000000004 RSI: ffff8880a84d9868 RDI: ffff88809d4d8d10 [ 905.309491][ C1] RBP: 1ffff920002ccd92 R08: 0000000000000001 R09: ffff88809d4d8ce0 [ 905.309496][ C1] R10: fffffbfff16b3329 R11: 0000000000000000 R12: ffff88809d4d8d10 [ 905.309502][ C1] R13: ffff8880a84d9868 R14: ffffc90001666cd0 R15: 0000000000000001 [ 905.309508][ C1] FS: 00000000025e7880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 905.309513][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 905.309518][ C1] CR2: 00007fff2de05b80 CR3: 00000000a10b4000 CR4: 00000000001506e0 [ 905.309524][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 905.309530][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 905.309533][ C1] Call Trace: [ 905.309537][ C1] ? tcf_idr_check_alloc+0x29e/0x3b0 [ 905.309541][ C1] lock_release+0x244/0x8f0 [ 905.309545][ C1] ? lock_downgrade+0x830/0x830 [ 905.309549][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 905.309553][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 905.309557][ C1] __mutex_unlock_slowpath+0x81/0x610 [ 905.309562][ C1] ? wait_for_completion+0x260/0x260 [ 905.309566][ C1] tcf_idr_check_alloc+0x29e/0x3b0 [ 905.309570][ C1] tcf_police_init+0x347/0x13a0 [ 905.309574][ C1] ? tcf_police_cleanup+0x60/0x60 [ 905.309578][ C1] ? find_held_lock+0x2d/0x110 [ 905.309582][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 905.309586][ C1] tcf_action_init_1+0x1a3/0x990 [ 905.309590][ C1] ? tcf_action_dump_old+0x80/0x80 [ 905.309594][ C1] ? lock_acquire+0x1f3/0xaf0 [ 905.309598][ C1] ? lock_is_held_type+0xbb/0xf0 [ 905.309602][ C1] ? find_held_lock+0x2d/0x110 [ 905.309606][ C1] ? fs_reclaim_release+0x90/0xd0 [ 905.309610][ C1] ? mark_lock+0x82/0x1660 [ 905.309614][ C1] tcf_exts_validate+0x138/0x420 [ 905.309618][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 905.309622][ C1] ? kmem_cache_alloc_trace+0x18e/0x300 [ 905.309626][ C1] ? __nla_parse+0x3d/0x4a [ 905.309630][ C1] route4_change+0x6d8/0x2380 [ 905.309634][ C1] ? route4_delete+0xb70/0xb70 [ 905.309638][ C1] ? lock_is_held_type+0xbb/0xf0 [ 905.309642][ C1] tc_new_tfilter+0x1398/0x2130 [ 905.309646][ C1] ? route4_delete+0xb70/0xb70 [ 905.309650][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 905.309654][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 905.309659][ C1] ? check_nnp_nosuid.isra.0+0x2a0/0x2a0 [ 905.309663][ C1] ? lock_is_held_type+0xbb/0xf0 [ 905.309667][ C1] ? security_capable+0x8f/0xc0 [ 905.309671][ C1] ? lock_is_held_type+0xbb/0xf0 [ 905.309675][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 905.309679][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 905.309683][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 905.309687][ C1] ? lock_acquire+0x1f3/0xaf0 [ 905.309691][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 905.309695][ C1] netlink_rcv_skb+0x15a/0x430 [ 905.309699][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 905.309703][ C1] ? netlink_ack+0xa10/0xa10 [ 905.309707][ C1] netlink_unicast+0x533/0x7d0 [ 905.309711][ C1] ? netlink_attachskb+0x810/0x810 [ 905.309715][ C1] netlink_sendmsg+0x856/0xd90 [ 905.309719][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 905.309723][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 905.309727][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 905.309731][ C1] sock_sendmsg+0xcf/0x120 [ 905.309735][ C1] ____sys_sendmsg+0x331/0x810 [ 905.309739][ C1] ? kernel_sendmsg+0x50/0x50 [ 905.309743][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 905.309747][ C1] ? sock_alloc_file+0x4f/0x190 [ 905.309751][ C1] ? __lock_acquire+0x164a/0x5780 [ 905.309755][ C1] ___sys_sendmsg+0xf3/0x170 [ 905.309759][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 905.309764][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 905.309768][ C1] ? fs_reclaim_release+0x90/0xd0 [ 905.309772][ C1] ? lock_is_held_type+0xbb/0xf0 [ 905.309776][ C1] ? find_held_lock+0x2d/0x110 [ 905.309780][ C1] ? __might_fault+0x11f/0x1d0 [ 905.309784][ C1] ? lock_downgrade+0x830/0x830 [ 905.309788][ C1] ? lock_is_held_type+0xbb/0xf0 [ 905.309792][ C1] __sys_sendmmsg+0x195/0x480 [ 905.309796][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 905.309800][ C1] ? find_held_lock+0x2d/0x110 [ 905.309803][ C1] ? __fd_install+0x1b4/0x600 [ 905.309807][ C1] ? alloc_file_pseudo+0x1/0x250 [ 905.309811][ C1] ? lock_is_held_type+0xbb/0xf0 [ 905.309815][ C1] ? __fd_install+0x1e6/0x600 [ 905.309819][ C1] ? __sys_socket+0x16d/0x200 [ 905.309823][ C1] ? lock_is_held_type+0xbb/0xf0 [ 905.309828][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 905.309832][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 905.309836][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 905.309840][ C1] do_syscall_64+0x2d/0x70 [ 905.309845][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 905.309848][ C1] RIP: 0033:0x441599 [ 905.309860][ C1] Code: e8 5c ad 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 bb 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 905.309864][ C1] RSP: 002b:00007fff2de05b78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 905.309874][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441599 [ 905.309879][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 905.309885][ C1] RBP: 00007fff2de05b80 R08: 0000000100000000 R09: 0000000100000000 [ 905.309890][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000099b41 [ 905.309896][ C1] R13: 0000000000402470 R14: 0000000000000000 R15: 0000000000000000 [ 905.309902][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 905.328516][ T1175] Kernel panic - not syncing: hung_task: blocked tasks [ 905.920642][ T1175] CPU: 0 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 905.928873][ T1175] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 905.938924][ T1175] Call Trace: [ 905.942241][ T1175] dump_stack+0x198/0x1fd [ 905.946574][ T1175] panic+0x382/0x7fb [ 905.950472][ T1175] ? __warn_printk+0xf3/0xf3 [ 905.955074][ T1175] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 905.960706][ T1175] ? preempt_schedule_thunk+0x16/0x18 [ 905.966085][ T1175] ? watchdog.cold+0x5/0x16b [ 905.970675][ T1175] ? watchdog+0xa82/0x1000 [ 905.975091][ T1175] watchdog.cold+0x16/0x16b [ 905.979601][ T1175] ? reset_hung_task_detector+0x30/0x30 [ 905.985144][ T1175] kthread+0x3b5/0x4a0 [ 905.989220][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 905.994338][ T1175] ret_from_fork+0x1f/0x30 [ 906.000145][ T1175] Kernel Offset: disabled [ 906.004484][ T1175] Rebooting in 86400 seconds..