[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.21' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 602.790152][ T35] audit: type=1400 audit(1613038839.667:8): avc: denied { execmem } for pid=8454 comm="syz-executor928" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 602.811708][ T8455] IPVS: ftp: loaded support on port[0] = 21 [ 864.692470][ T1648] INFO: task kworker/0:3:3195 blocked for more than 143 seconds. [ 864.700422][ T1648] Not tainted 5.11.0-rc7-syzkaller #0 [ 864.710652][ T1648] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 864.720083][ T1648] task:kworker/0:3 state:D stack:27208 pid: 3195 ppid: 2 flags:0x00004000 [ 864.730021][ T1648] Workqueue: ipv6_addrconf addrconf_verify_work [ 864.737142][ T1648] Call Trace: [ 864.740482][ T1648] __schedule+0x90c/0x21a0 [ 864.746062][ T1648] ? io_schedule_timeout+0x140/0x140 [ 864.751375][ T1648] ? _raw_spin_unlock_irq+0x1f/0x40 [ 864.757754][ T1648] ? lockdep_hardirqs_on+0x79/0x100 [ 864.763714][ T1648] schedule+0xcf/0x270 [ 864.767811][ T1648] schedule_preempt_disabled+0xf/0x20 [ 864.774277][ T1648] __mutex_lock+0x81a/0x1110 [ 864.778898][ T1648] ? addrconf_verify_work+0xa/0x20 [ 864.785105][ T1648] ? mutex_lock_io_nested+0xf60/0xf60 [ 864.790510][ T1648] ? lock_release+0x710/0x710 [ 864.796480][ T1648] ? lock_downgrade+0x6d0/0x6d0 [ 864.801379][ T1648] addrconf_verify_work+0xa/0x20 [ 864.807447][ T1648] process_one_work+0x98d/0x15f0 [ 864.813236][ T1648] ? pwq_dec_nr_in_flight+0x320/0x320 [ 864.818642][ T1648] ? rwlock_bug.part.0+0x90/0x90 [ 864.824677][ T1648] ? _raw_spin_lock_irq+0x41/0x50 [ 864.829741][ T1648] worker_thread+0x64c/0x1120 [ 864.835552][ T1648] ? __kthread_parkme+0x13f/0x1e0 [ 864.840598][ T1648] ? process_one_work+0x15f0/0x15f0 [ 864.846917][ T1648] kthread+0x3b1/0x4a0 [ 864.851008][ T1648] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 864.858082][ T1648] ret_from_fork+0x1f/0x30 [ 864.863359][ T1648] [ 864.863359][ T1648] Showing all locks held in the system: [ 864.871081][ T1648] 1 lock held by khungtaskd/1648: [ 864.878183][ T1648] #0: ffffffff8bd73da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 864.889669][ T1648] 3 locks held by kworker/0:3/3195: [ 864.895469][ T1648] #0: ffff888147ab8d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 864.907124][ T1648] #1: ffffc90001ec7da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 864.918173][ T1648] #2: ffffffff8d45c2e8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 864.928348][ T1648] 1 lock held by in:imklog/8157: [ 864.933921][ T1648] #0: ffff88801a42ab70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 864.943810][ T1648] 2 locks held by syz-executor928/8477: [ 864.949436][ T1648] [ 864.951763][ T1648] ============================================= [ 864.951763][ T1648] [ 864.961995][ T1648] NMI backtrace for cpu 0 [ 864.966566][ T1648] CPU: 0 PID: 1648 Comm: khungtaskd Not tainted 5.11.0-rc7-syzkaller #0 [ 864.974902][ T1648] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 864.984962][ T1648] Call Trace: [ 864.988241][ T1648] dump_stack+0x107/0x163 [ 864.992655][ T1648] nmi_cpu_backtrace.cold+0x44/0xd7 [ 864.997869][ T1648] ? lapic_can_unplug_cpu+0x80/0x80 [ 865.003153][ T1648] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 865.009312][ T1648] watchdog+0xd43/0xfa0 [ 865.013549][ T1648] ? reset_hung_task_detector+0x30/0x30 [ 865.019121][ T1648] kthread+0x3b1/0x4a0 [ 865.023204][ T1648] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 865.029119][ T1648] ret_from_fork+0x1f/0x30 [ 865.033609][ T1648] Sending NMI from CPU 0 to CPUs 1: [ 865.040286][ C1] NMI backtrace for cpu 1 [ 865.040295][ C1] CPU: 1 PID: 8477 Comm: syz-executor928 Not tainted 5.11.0-rc7-syzkaller #0 [ 865.040305][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.040314][ C1] RIP: 0010:__lock_acquire+0x266/0x54f0 [ 865.040325][ C1] Code: c1 ea 03 0f b6 14 02 84 d2 74 09 80 fa 03 0f 8e 8e 12 00 00 41 0f b7 44 24 20 49 8d 7c 24 08 48 89 fa 48 c1 ea 03 66 25 00 e0 <09> c8 66 41 89 44 24 20 48 b8 00 00 00 00 00 fc ff df 80 3c 02 00 [ 865.040340][ C1] RSP: 0018:ffffc900015269a8 EFLAGS: 00000046 [ 865.040352][ C1] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000673 [ 865.040360][ C1] RDX: 1ffff11005dac997 RSI: 1ffff11005dac995 RDI: ffff88802ed64cb8 [ 865.040369][ C1] RBP: ffff88802ed64300 R08: 0000000000000001 R09: 0000000000000000 [ 865.040378][ C1] R10: 0000000000000028 R11: 0000000000000000 R12: ffff88802ed64cb0 [ 865.040386][ C1] R13: 0000000000000000 R14: ffff88801a580468 R15: 0000000000000000 [ 865.040395][ C1] FS: 0000000001f5c300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 865.040403][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 865.040410][ C1] CR2: 0000564bfbf0a708 CR3: 000000002bced000 CR4: 00000000001506e0 [ 865.040419][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 865.040427][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 865.040434][ C1] Call Trace: [ 865.040439][ C1] ? finish_task_switch.isra.0+0x234/0x7e0 [ 865.040445][ C1] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 865.040451][ C1] lock_acquire+0x1a8/0x720 [ 865.040456][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 865.040462][ C1] ? lock_release+0x710/0x710 [ 865.040467][ C1] __mutex_lock+0x134/0x1110 [ 865.040472][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 865.040478][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 865.040484][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 865.040489][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 865.040495][ C1] ? check_kcov_mode+0x2e/0x40 [ 865.040501][ C1] ? wait_for_completion_io+0x260/0x260 [ 865.040507][ C1] ? __radix_tree_lookup+0x211/0x2a0 [ 865.040512][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 865.040518][ C1] tcf_police_init+0x34f/0x1460 [ 865.040523][ C1] ? tcf_police_cleanup+0x60/0x60 [ 865.040529][ C1] ? find_held_lock+0x2d/0x110 [ 865.040534][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 865.040540][ C1] tcf_action_init_1+0x1a3/0x990 [ 865.040545][ C1] ? tcf_action_dump_old+0x80/0x80 [ 865.040551][ C1] ? lock_chain_count+0x20/0x20 [ 865.040556][ C1] ? find_held_lock+0x2d/0x110 [ 865.040561][ C1] tcf_exts_validate+0x138/0x420 [ 865.040573][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 865.040579][ C1] ? rcu_read_lock_sched_held+0x3a/0x70 [ 865.040585][ C1] ? trace_kmalloc+0xbe/0xf0 [ 865.040590][ C1] ? kmem_cache_alloc_trace+0x1f9/0x400 [ 865.040596][ C1] rsvp_change+0x291/0x27a0 [ 865.040601][ C1] ? find_held_lock+0x2d/0x110 [ 865.040607][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 865.040612][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 865.040618][ C1] ? blackhole_dequeue+0x10/0x10 [ 865.040624][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 865.040630][ C1] tc_new_tfilter+0x1394/0x2120 [ 865.040636][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 865.040642][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 865.040647][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 865.040653][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 865.040659][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 865.040665][ C1] netlink_rcv_skb+0x153/0x420 [ 865.040670][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 865.040676][ C1] ? netlink_ack+0xaa0/0xaa0 [ 865.040681][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 865.040687][ C1] netlink_unicast+0x533/0x7d0 [ 865.040692][ C1] ? netlink_attachskb+0x870/0x870 [ 865.040698][ C1] ? _copy_from_iter_full+0x275/0x850 [ 865.040704][ C1] netlink_sendmsg+0x856/0xd90 [ 865.040709][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 865.040720][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 865.040727][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 865.040732][ C1] sock_sendmsg+0xcf/0x120 [ 865.040737][ C1] ____sys_sendmsg+0x331/0x810 [ 865.040742][ C1] ? kernel_sendmsg+0x50/0x50 [ 865.040748][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 865.040753][ C1] ? alloc_file+0x5e/0x5a0 [ 865.040758][ C1] ? __lock_acquire+0x16c2/0x54f0 [ 865.040763][ C1] ___sys_sendmsg+0xf3/0x170 [ 865.040769][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 865.040775][ C1] ? find_held_lock+0x2d/0x110 [ 865.040780][ C1] ? __might_fault+0xd3/0x180 [ 865.040785][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 865.040790][ C1] __sys_sendmmsg+0x195/0x470 [ 865.040796][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 865.040801][ C1] ? find_held_lock+0x2d/0x110 [ 865.040806][ C1] ? alloc_file_pseudo+0x1/0x250 [ 865.040812][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 865.040818][ C1] ? fd_install+0x215/0x640 [ 865.040823][ C1] ? __sys_socket+0x16d/0x200 [ 865.040827][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 865.040833][ C1] ? syscall_enter_from_user_mode+0x1d/0x50 [ 865.040838][ C1] do_syscall_64+0x2d/0x70 [ 865.040843][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 865.040848][ C1] RIP: 0033:0x440269 [ 865.040856][ C1] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 865.040870][ C1] RSP: 002b:00007fffa478aa18 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 865.040882][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000440269 [ 865.040889][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 865.040896][ C1] RBP: 0000000000000000 R08: 00000000004ab000 R09: 00000000004ab000 [ 865.040904][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffa478aa50 [ 865.040911][ C1] R13: 00007fffa478aa40 R14: 00007fffa478aa30 R15: 0000000000400488 [ 865.040919][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.435 msecs [ 865.085551][ T1648] Kernel panic - not syncing: hung_task: blocked tasks [ 865.627688][ T1648] CPU: 0 PID: 1648 Comm: khungtaskd Not tainted 5.11.0-rc7-syzkaller #0 [ 865.636023][ T1648] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.646081][ T1648] Call Trace: [ 865.649364][ T1648] dump_stack+0x107/0x163 [ 865.653722][ T1648] panic+0x306/0x73d [ 865.657633][ T1648] ? __warn_printk+0xf3/0xf3 [ 865.662236][ T1648] ? lapic_can_unplug_cpu+0x80/0x80 [ 865.667448][ T1648] ? preempt_schedule_thunk+0x16/0x18 [ 865.672832][ T1648] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 865.678998][ T1648] ? watchdog.cold+0x5/0x158 [ 865.683654][ T1648] watchdog.cold+0x16/0x158 [ 865.688192][ T1648] ? reset_hung_task_detector+0x30/0x30 [ 865.693758][ T1648] kthread+0x3b1/0x4a0 [ 865.697839][ T1648] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 865.703748][ T1648] ret_from_fork+0x1f/0x30 [ 865.709028][ T1648] Kernel Offset: disabled [ 865.713370][ T1648] Rebooting in 86400 seconds..