[ 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 '10.128.1.53' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 466.116926][ T8417] IPVS: ftp: loaded support on port[0] = 21 [ 715.667522][ T1633] INFO: task kworker/0:0:5 blocked for more than 143 seconds. [ 715.675145][ T1633] Not tainted 5.11.0-rc7-syzkaller #0 [ 715.682559][ T1633] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 715.691946][ T1633] task:kworker/0:0 state:D stack:28200 pid: 5 ppid: 2 flags:0x00004000 [ 715.701898][ T1633] Workqueue: ipv6_addrconf addrconf_verify_work [ 715.708919][ T1633] Call Trace: [ 715.712207][ T1633] __schedule+0x90c/0x21a0 [ 715.716634][ T1633] ? io_schedule_timeout+0x140/0x140 [ 715.724139][ T1633] ? _raw_spin_unlock_irq+0x1f/0x40 [ 715.730087][ T1633] ? lockdep_hardirqs_on+0x79/0x100 [ 715.735298][ T1633] schedule+0xcf/0x270 [ 715.740377][ T1633] schedule_preempt_disabled+0xf/0x20 [ 715.745761][ T1633] __mutex_lock+0x81a/0x1110 [ 715.751924][ T1633] ? addrconf_verify_work+0xa/0x20 [ 715.757051][ T1633] ? mutex_lock_io_nested+0xf60/0xf60 [ 715.763381][ T1633] ? lock_release+0x710/0x710 [ 715.768787][ T1633] ? lock_downgrade+0x6d0/0x6d0 [ 715.773661][ T1633] addrconf_verify_work+0xa/0x20 [ 715.779643][ T1633] process_one_work+0x98d/0x15f0 [ 715.784773][ T1633] ? pwq_dec_nr_in_flight+0x320/0x320 [ 715.791185][ T1633] ? rwlock_bug.part.0+0x90/0x90 [ 715.796157][ T1633] ? _raw_spin_lock_irq+0x41/0x50 [ 715.802178][ T1633] worker_thread+0x64c/0x1120 [ 715.806877][ T1633] ? process_one_work+0x15f0/0x15f0 [ 715.813069][ T1633] kthread+0x3b1/0x4a0 [ 715.817142][ T1633] ? __kthread_bind_mask+0xc0/0xc0 [ 715.823394][ T1633] ret_from_fork+0x1f/0x30 [ 715.828671][ T1633] [ 715.828671][ T1633] Showing all locks held in the system: [ 715.836383][ T1633] 3 locks held by kworker/0:0/5: [ 715.842428][ T1633] #0: ffff888021a43138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 715.855741][ T1633] #1: ffffc90000ca7da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 715.866715][ T1633] #2: ffffffff8d459028 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 715.876852][ T1633] 1 lock held by khungtaskd/1633: [ 715.882544][ T1633] #0: ffffffff8bd73da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 715.893375][ T1633] 1 lock held by in:imklog/8126: [ 715.898980][ T1633] #0: ffff888013950370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 715.909048][ T1633] 2 locks held by syz-executor495/8440: [ 715.914624][ T1633] [ 715.917026][ T1633] ============================================= [ 715.917026][ T1633] [ 715.926957][ T1633] NMI backtrace for cpu 0 [ 715.931451][ T1633] CPU: 0 PID: 1633 Comm: khungtaskd Not tainted 5.11.0-rc7-syzkaller #0 [ 715.939776][ T1633] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 715.949824][ T1633] Call Trace: [ 715.953268][ T1633] dump_stack+0x107/0x163 [ 715.957691][ T1633] nmi_cpu_backtrace.cold+0x44/0xd7 [ 715.962890][ T1633] ? lapic_can_unplug_cpu+0x80/0x80 [ 715.968093][ T1633] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 715.974077][ T1633] watchdog+0xd43/0xfa0 [ 715.978237][ T1633] ? reset_hung_task_detector+0x30/0x30 [ 715.983786][ T1633] kthread+0x3b1/0x4a0 [ 715.987854][ T1633] ? __kthread_bind_mask+0xc0/0xc0 [ 715.992963][ T1633] ret_from_fork+0x1f/0x30 [ 715.997523][ T1633] Sending NMI from CPU 0 to CPUs 1: [ 716.003877][ C1] NMI backtrace for cpu 1 [ 716.003886][ C1] CPU: 1 PID: 8440 Comm: syz-executor495 Not tainted 5.11.0-rc7-syzkaller #0 [ 716.003894][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.003901][ C1] RIP: 0010:__lock_acquire+0xdd8/0x54f0 [ 716.003910][ C1] Code: 01 0f 87 3b f3 ff ff 44 89 e0 0f 87 53 30 00 00 49 8d 7c c6 08 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c 11 00 <0f> 85 59 30 00 00 49 8b 54 c6 08 48 85 d2 0f 85 25 f3 ff ff e9 ff [ 716.003922][ C1] RSP: 0018:ffffc900015fea70 EFLAGS: 00000046 [ 716.003932][ C1] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 1ffff110030e848e [ 716.003939][ C1] RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff888018742470 [ 716.003946][ C1] RBP: ffff8880150b0000 R08: 0000000000000001 R09: 0000000000000000 [ 716.003952][ C1] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 [ 716.003959][ C1] R13: 0000000000000000 R14: ffff888018742468 R15: 0000000000000000 [ 716.003966][ C1] FS: 00000000005753c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 716.003973][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 716.003984][ C1] CR2: 00007efd4e005000 CR3: 000000002624a000 CR4: 0000000000350ee0 [ 716.003990][ C1] Call Trace: [ 716.003994][ C1] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 716.003998][ C1] ? mark_held_locks+0x9f/0xe0 [ 716.004003][ C1] lock_acquire+0x1a8/0x720 [ 716.004007][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 716.004011][ C1] ? lock_release+0x710/0x710 [ 716.004015][ C1] __mutex_lock+0x134/0x1110 [ 716.004019][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 716.004024][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 716.004028][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 716.004033][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 716.004038][ C1] ? wait_for_completion_io+0x260/0x260 [ 716.004042][ C1] ? tcf_idr_check_alloc+0x99/0x3b0 [ 716.004047][ C1] ? __radix_tree_lookup+0x211/0x2a0 [ 716.004051][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 716.004056][ C1] tcf_police_init+0x34f/0x1460 [ 716.004060][ C1] ? tcf_police_cleanup+0x60/0x60 [ 716.004064][ C1] ? find_held_lock+0x2d/0x110 [ 716.004068][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 716.004073][ C1] tcf_action_init_1+0x1a3/0x990 [ 716.004077][ C1] ? tcf_action_dump_old+0x80/0x80 [ 716.004081][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 716.004086][ C1] ? find_held_lock+0x2d/0x110 [ 716.004090][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 716.004095][ C1] ? wait_for_completion_io+0x260/0x260 [ 716.004099][ C1] tcf_exts_validate+0x138/0x420 [ 716.004103][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 716.004107][ C1] basic_change+0x47a/0x1310 [ 716.004111][ C1] ? basic_delete+0x680/0x680 [ 716.004115][ C1] tc_new_tfilter+0x1394/0x2120 [ 716.004119][ C1] ? basic_delete+0x680/0x680 [ 716.004123][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 716.004127][ C1] ? lock_chain_count+0x20/0x20 [ 716.004131][ C1] ? kernel_text_address+0xbd/0xf0 [ 716.004135][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 716.004140][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 716.004144][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 716.004148][ C1] netlink_rcv_skb+0x153/0x420 [ 716.004152][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 716.004156][ C1] ? netlink_ack+0xaa0/0xaa0 [ 716.004160][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 716.004165][ C1] netlink_unicast+0x533/0x7d0 [ 716.004169][ C1] ? netlink_attachskb+0x870/0x870 [ 716.004173][ C1] ? _copy_from_iter_full+0x275/0x850 [ 716.004178][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 716.004182][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 716.004187][ C1] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 716.004191][ C1] ? __check_object_size+0x171/0x3f0 [ 716.004195][ C1] netlink_sendmsg+0x856/0xd90 [ 716.004199][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 716.004204][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 716.004209][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 716.004212][ C1] sock_sendmsg+0xcf/0x120 [ 716.004216][ C1] ____sys_sendmsg+0x331/0x810 [ 716.004220][ C1] ? kernel_sendmsg+0x50/0x50 [ 716.004224][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 716.004228][ C1] ? __lock_acquire+0x16c2/0x54f0 [ 716.004232][ C1] ___sys_sendmsg+0xf3/0x170 [ 716.004236][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 716.004240][ C1] ? find_held_lock+0x2d/0x110 [ 716.004244][ C1] ? __might_fault+0xd3/0x180 [ 716.004248][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 716.004252][ C1] __sys_sendmmsg+0x195/0x470 [ 716.004256][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 716.004261][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 716.004265][ C1] ? sockfd_lookup_light+0xc5/0x180 [ 716.004270][ C1] ? __sys_sendmsg+0x10c/0x1b0 [ 716.004274][ C1] ? __sys_sendmsg_sock+0xb0/0xb0 [ 716.004278][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 716.004283][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 716.004287][ C1] ? syscall_enter_from_user_mode+0x1d/0x50 [ 716.004291][ C1] do_syscall_64+0x2d/0x70 [ 716.004295][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 716.004300][ C1] RIP: 0033:0x441309 [ 716.004307][ 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 c4 ff ff ff f7 d8 64 89 01 48 [ 716.004318][ C1] RSP: 002b:00007ffc0bcfa748 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 716.004328][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441309 [ 716.004335][ C1] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 [ 716.004341][ C1] RBP: 0000000000000000 R08: 00007ffc0bcfa780 R09: 00007ffc0bcfa780 [ 716.004347][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000071cdf [ 716.004354][ C1] R13: 00007ffc0bcfa780 R14: 00007ffc0bcfa770 R15: 00007ffc0bcfa764 [ 716.005451][ T1633] Kernel panic - not syncing: hung_task: blocked tasks [ 716.568830][ T1633] CPU: 0 PID: 1633 Comm: khungtaskd Not tainted 5.11.0-rc7-syzkaller #0 [ 716.577152][ T1633] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.587198][ T1633] Call Trace: [ 716.590481][ T1633] dump_stack+0x107/0x163 [ 716.594817][ T1633] panic+0x306/0x73d [ 716.598712][ T1633] ? __warn_printk+0xf3/0xf3 [ 716.603307][ T1633] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.608505][ T1633] ? preempt_schedule_thunk+0x16/0x18 [ 716.614145][ T1633] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 716.620301][ T1633] ? watchdog.cold+0x5/0x158 [ 716.624896][ T1633] watchdog.cold+0x16/0x158 [ 716.629403][ T1633] ? reset_hung_task_detector+0x30/0x30 [ 716.634979][ T1633] kthread+0x3b1/0x4a0 [ 716.639046][ T1633] ? __kthread_bind_mask+0xc0/0xc0 [ 716.644154][ T1633] ret_from_fork+0x1f/0x30 [ 716.653308][ T1633] Kernel Offset: disabled [ 716.657810][ T1633] Rebooting in 86400 seconds..