[ 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 '10.128.0.95' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 453.330809][ T6885] IPVS: ftp: loaded support on port[0] = 21 [ 616.899512][ T1164] INFO: task kworker/u4:2:42 blocked for more than 143 seconds. [ 616.907358][ T1164] Not tainted 5.9.0-rc6-syzkaller #0 [ 616.915847][ T1164] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.925661][ T1164] task:kworker/u4:2 state:D stack:25408 pid: 42 ppid: 2 flags:0x00004000 [ 616.937562][ T1164] Workqueue: tc_filter_workqueue tcindex_partial_destroy_work [ 616.946290][ T1164] Call Trace: [ 616.950707][ T1164] __schedule+0xec9/0x2280 [ 616.955737][ T1164] ? io_schedule_timeout+0x140/0x140 [ 616.962704][ T1164] schedule+0xd0/0x2a0 [ 616.966892][ T1164] schedule_preempt_disabled+0xf/0x20 [ 616.973869][ T1164] __mutex_lock+0x3e2/0x10e0 [ 616.978499][ T1164] ? tcindex_partial_destroy_work+0x13/0x50 [ 616.986157][ T1164] ? mutex_lock_io_nested+0xf60/0xf60 [ 616.992879][ T1164] ? process_one_work+0x85f/0x1670 [ 616.998112][ T1164] ? lock_release+0x8f0/0x8f0 [ 617.004405][ T1164] ? _raw_spin_unlock_irq+0x1f/0x80 [ 617.010719][ T1164] ? _raw_spin_unlock_irq+0x1f/0x80 [ 617.015987][ T1164] tcindex_partial_destroy_work+0x13/0x50 [ 617.023429][ T1164] process_one_work+0x94c/0x1670 [ 617.028421][ T1164] ? lock_release+0x8f0/0x8f0 [ 617.034778][ T1164] ? pwq_dec_nr_in_flight+0x320/0x320 [ 617.041372][ T1164] ? rwlock_bug.part.0+0x90/0x90 [ 617.046440][ T1164] ? lockdep_hardirqs_off+0x96/0xd0 [ 617.053195][ T1164] worker_thread+0x64c/0x1120 [ 617.057928][ T1164] ? process_one_work+0x1670/0x1670 [ 617.065978][ T1164] kthread+0x3b5/0x4a0 [ 617.071145][ T1164] ? __kthread_bind_mask+0xc0/0xc0 [ 617.076522][ T1164] ret_from_fork+0x1f/0x30 [ 617.084231][ T1164] [ 617.084231][ T1164] Showing all locks held in the system: [ 617.093171][ T1164] 3 locks held by kworker/u4:2/42: [ 617.098330][ T1164] #0: ffff88821a96d138 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 617.111338][ T1164] #1: ffffc90000f17da8 ((work_completion)(&(rwork)->work)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 617.123847][ T1164] #2: ffffffff8b14d948 (rtnl_mutex){+.+.}-{3:3}, at: tcindex_partial_destroy_work+0x13/0x50 [ 617.136189][ T1164] 1 lock held by khungtaskd/1164: [ 617.142586][ T1164] #0: ffffffff8a067f00 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 617.153636][ T1164] 1 lock held by in:imklog/6564: [ 617.158592][ T1164] #0: ffff8880a862f5f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 617.170265][ T1164] 3 locks held by kworker/0:0/6877: [ 617.175485][ T1164] #0: ffff88809a5d6d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 617.188238][ T1164] #1: ffffc90005697da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 617.202031][ T1164] #2: ffffffff8b14d948 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 617.212639][ T1164] 2 locks held by syz-executor021/6906: [ 617.218282][ T1164] [ 617.222128][ T1164] ============================================= [ 617.222128][ T1164] [ 617.231804][ T1164] NMI backtrace for cpu 0 [ 617.236157][ T1164] CPU: 0 PID: 1164 Comm: khungtaskd Not tainted 5.9.0-rc6-syzkaller #0 [ 617.244425][ T1164] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 617.254490][ T1164] Call Trace: [ 617.257928][ T1164] dump_stack+0x198/0x1fd [ 617.262283][ T1164] nmi_cpu_backtrace.cold+0x70/0xb1 [ 617.267627][ T1164] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 617.273294][ T1164] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 617.279394][ T1164] watchdog+0xd7d/0x1000 [ 617.283672][ T1164] ? reset_hung_task_detector+0x30/0x30 [ 617.289326][ T1164] kthread+0x3b5/0x4a0 [ 617.293435][ T1164] ? __kthread_bind_mask+0xc0/0xc0 [ 617.298564][ T1164] ret_from_fork+0x1f/0x30 [ 617.303264][ T1164] Sending NMI from CPU 0 to CPUs 1: [ 617.310284][ C1] NMI backtrace for cpu 1 [ 617.310292][ C1] CPU: 1 PID: 6906 Comm: syz-executor021 Not tainted 5.9.0-rc6-syzkaller #0 [ 617.310299][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 617.310303][ C1] RIP: 0010:arch_local_irq_restore+0x27/0x50 [ 617.310315][ C1] Code: 44 00 00 48 c7 c0 a8 6b fc 89 53 48 89 fb 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 18 48 83 3d 21 7f a1 08 00 <74> 0c 48 89 df 57 9d 0f 1f 44 00 00 5b c3 0f 0b 48 c7 c7 a8 6b fc [ 617.310320][ C1] RSP: 0018:ffffc900055f6a10 EFLAGS: 00000082 [ 617.310328][ C1] RAX: 1ffffffff13f8d75 RBX: 0000000000000286 RCX: 0000000000000000 [ 617.310334][ C1] RDX: dffffc0000000000 RSI: ffffffff8a067ea0 RDI: 0000000000000286 [ 617.310339][ C1] RBP: ffff8880924e2300 R08: ffffffff868a9678 R09: ffff88809eeaa607 [ 617.310345][ C1] R10: ffffed1013dd54c0 R11: 0000000000000000 R12: 0000000000000000 [ 617.310350][ C1] R13: ffff8880924e2be8 R14: ffff8880924e2be8 R15: 0000000000000286 [ 617.310356][ C1] FS: 0000000000760880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 617.310361][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 617.310366][ C1] CR2: 00007fd2997bd6c0 CR3: 000000009ee5b000 CR4: 00000000001506e0 [ 617.310372][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 617.310377][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 617.310380][ C1] Call Trace: [ 617.310384][ C1] lock_is_held_type+0xbb/0xf0 [ 617.310388][ C1] ___might_sleep+0x22b/0x2f0 [ 617.310392][ C1] __mutex_lock+0xa9/0x10e0 [ 617.310396][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 617.310400][ C1] ? check_preemption_disabled+0x50/0x130 [ 617.310404][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 617.310408][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 617.310413][ C1] ? wait_for_completion+0x260/0x260 [ 617.310416][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 617.310420][ C1] tcf_police_init+0x347/0x13a0 [ 617.310424][ C1] ? tcf_police_cleanup+0x60/0x60 [ 617.310428][ C1] ? find_held_lock+0x2d/0x110 [ 617.310432][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 617.310436][ C1] tcf_action_init_1+0x1a3/0x990 [ 617.310440][ C1] ? tcf_action_dump_old+0x80/0x80 [ 617.310444][ C1] ? lock_acquire+0x1f3/0xaf0 [ 617.310448][ C1] ? lock_is_held_type+0xbb/0xf0 [ 617.310452][ C1] ? find_held_lock+0x2d/0x110 [ 617.310456][ C1] ? fs_reclaim_release+0x90/0xd0 [ 617.310459][ C1] ? mark_lock+0x82/0x1660 [ 617.310463][ C1] ? mark_lock+0x82/0x1660 [ 617.310467][ C1] tcf_exts_validate+0x138/0x420 [ 617.310471][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 617.310475][ C1] ? kmem_cache_alloc_trace+0x18e/0x300 [ 617.310479][ C1] tcindex_set_parms+0x189/0x20d0 [ 617.310484][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 617.310488][ C1] ? tcindex_alloc_perfect_hash+0x440/0x440 [ 617.310492][ C1] ? __nla_validate_parse+0x2d4/0x2210 [ 617.310496][ C1] ? nla_get_range_signed+0x520/0x520 [ 617.310500][ C1] ? lock_is_held_type+0xbb/0xf0 [ 617.310504][ C1] ? lock_is_held_type+0xbb/0xf0 [ 617.310508][ C1] ? find_held_lock+0x2d/0x110 [ 617.310512][ C1] tcindex_change+0x203/0x2e0 [ 617.310516][ C1] ? tcindex_set_parms+0x20d0/0x20d0 [ 617.310521][ C1] ? tcindex_lookup+0x390/0x390 [ 617.310525][ C1] ? lockdep_rtnl_is_held+0x22/0x30 [ 617.310529][ C1] tc_new_tfilter+0x1398/0x2130 [ 617.310533][ C1] ? tcindex_set_parms+0x20d0/0x20d0 [ 617.310537][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 617.310542][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 617.310547][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 617.310551][ C1] ? lock_is_held_type+0xbb/0xf0 [ 617.310555][ C1] ? security_capable+0x8f/0xc0 [ 617.310559][ C1] ? lock_is_held_type+0xbb/0xf0 [ 617.310563][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 617.310568][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 617.310572][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 617.310576][ C1] ? lock_acquire+0x1f3/0xaf0 [ 617.310580][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 617.310585][ C1] netlink_rcv_skb+0x15a/0x430 [ 617.310589][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 617.310593][ C1] ? netlink_ack+0xa10/0xa10 [ 617.310598][ C1] ? __kmalloc_node_track_caller+0x38/0x60 [ 617.310602][ C1] netlink_unicast+0x533/0x7d0 [ 617.310606][ C1] ? netlink_attachskb+0x810/0x810 [ 617.310610][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 617.310615][ C1] ? __check_object_size+0x171/0x3e4 [ 617.310619][ C1] netlink_sendmsg+0x856/0xd90 [ 617.310623][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 617.310627][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 617.310631][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 617.310635][ C1] sock_sendmsg+0xcf/0x120 [ 617.310640][ C1] ____sys_sendmsg+0x331/0x810 [ 617.310644][ C1] ? kernel_sendmsg+0x50/0x50 [ 617.310648][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 617.310652][ C1] ? __lock_acquire+0x164a/0x5780 [ 617.310656][ C1] ___sys_sendmsg+0xf3/0x170 [ 617.310660][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 617.310665][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 617.310669][ C1] ? lock_is_held_type+0xbb/0xf0 [ 617.310673][ C1] ? find_held_lock+0x2d/0x110 [ 617.310677][ C1] ? __might_fault+0x11f/0x1d0 [ 617.310681][ C1] ? lock_downgrade+0x830/0x830 [ 617.310685][ C1] ? lock_is_held_type+0xbb/0xf0 [ 617.310689][ C1] ? lock_is_held_type+0xbb/0xf0 [ 617.310693][ C1] __sys_sendmmsg+0x195/0x480 [ 617.310698][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 617.310702][ C1] ? __might_fault+0x190/0x1d0 [ 617.310706][ C1] ? _copy_to_user+0x126/0x160 [ 617.310710][ C1] ? sockfd_lookup_light+0xc6/0x180 [ 617.310714][ C1] ? __sys_sendmsg+0x10c/0x1b0 [ 617.310718][ C1] ? __sys_sendmsg_sock+0xb0/0xb0 [ 617.310722][ C1] ? lock_is_held_type+0xbb/0xf0 [ 617.310727][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 617.310731][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 617.310736][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 617.310739][ C1] do_syscall_64+0x2d/0x70 [ 617.310743][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 617.310746][ C1] RIP: 0033:0x441719 [ 617.310756][ 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 [ 617.310759][ C1] RSP: 002b:00007ffe774fb1d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 617.310765][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441719 [ 617.310768][ C1] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 [ 617.310772][ C1] RBP: 00007ffe774fb1e0 R08: 0000000120080522 R09: 0000000120080522 [ 617.310775][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2a50 [ 617.310778][ C1] R13: 00000000004025f0 R14: 0000000000000000 R15: 0000000000000000 [ 617.310782][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 617.329389][ T1164] Kernel panic - not syncing: hung_task: blocked tasks [ 617.986467][ T1164] CPU: 0 PID: 1164 Comm: khungtaskd Not tainted 5.9.0-rc6-syzkaller #0 [ 617.994720][ T1164] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 618.004881][ T1164] Call Trace: [ 618.008234][ T1164] dump_stack+0x198/0x1fd [ 618.012646][ T1164] panic+0x382/0x7fb [ 618.016570][ T1164] ? __warn_printk+0xf3/0xf3 [ 618.021205][ T1164] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 618.026858][ T1164] ? preempt_schedule_thunk+0x16/0x18 [ 618.032280][ T1164] ? watchdog.cold+0x5/0x16b [ 618.036995][ T1164] ? watchdog+0xa82/0x1000 [ 618.041440][ T1164] watchdog.cold+0x16/0x16b [ 618.045980][ T1164] ? reset_hung_task_detector+0x30/0x30 [ 618.052966][ T1164] kthread+0x3b5/0x4a0 [ 618.057053][ T1164] ? __kthread_bind_mask+0xc0/0xc0 [ 618.062182][ T1164] ret_from_fork+0x1f/0x30 [ 618.067960][ T1164] Kernel Offset: disabled [ 618.072474][ T1164] Rebooting in 86400 seconds..