[ 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 '10.128.0.122' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 487.781992][ T8502] IPVS: ftp: loaded support on port[0] = 21 [ 721.466271][ T1657] INFO: task kworker/0:1:8494 blocked for more than 143 seconds. [ 721.474381][ T1657] Not tainted 5.11.0-rc4-syzkaller #0 [ 721.482165][ T1657] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.491557][ T1657] task:kworker/0:1 state:D stack:29232 pid: 8494 ppid: 2 flags:0x00004000 [ 721.501439][ T1657] Workqueue: ipv6_addrconf addrconf_verify_work [ 721.508505][ T1657] Call Trace: [ 721.511850][ T1657] __schedule+0x90c/0x21a0 [ 721.517495][ T1657] ? io_schedule_timeout+0x140/0x140 [ 721.522800][ T1657] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.529040][ T1657] ? lockdep_hardirqs_on+0x79/0x100 [ 721.534307][ T1657] schedule+0xcf/0x270 [ 721.539422][ T1657] schedule_preempt_disabled+0xf/0x20 [ 721.544823][ T1657] __mutex_lock+0x81a/0x1110 [ 721.550456][ T1657] ? addrconf_verify_work+0xa/0x20 [ 721.555608][ T1657] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.562329][ T1657] ? lock_release+0x710/0x710 [ 721.568904][ T1657] ? lock_downgrade+0x6d0/0x6d0 [ 721.573810][ T1657] addrconf_verify_work+0xa/0x20 [ 721.579826][ T1657] process_one_work+0x98d/0x15f0 [ 721.584860][ T1657] ? pwq_dec_nr_in_flight+0x320/0x320 [ 721.591276][ T1657] ? rwlock_bug.part.0+0x90/0x90 [ 721.596936][ T1657] ? _raw_spin_lock_irq+0x41/0x50 [ 721.601992][ T1657] worker_thread+0x64c/0x1120 [ 721.607705][ T1657] ? __kthread_parkme+0x13f/0x1e0 [ 721.612797][ T1657] ? process_one_work+0x15f0/0x15f0 [ 721.618997][ T1657] kthread+0x3b1/0x4a0 [ 721.623085][ T1657] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.630334][ T1657] ret_from_fork+0x1f/0x30 [ 721.634889][ T1657] [ 721.634889][ T1657] Showing all locks held in the system: [ 721.643857][ T1657] 1 lock held by khungtaskd/1657: [ 721.650494][ T1657] #0: ffffffff8b373920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.661177][ T1657] 1 lock held by in:imklog/8174: [ 721.666708][ T1657] #0: ffff88801bb340f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.675996][ T1657] 3 locks held by kworker/0:1/8494: [ 721.682200][ T1657] #0: ffff888147162938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 721.693809][ T1657] #1: ffffc90001be7da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 721.705944][ T1657] #2: ffffffff8ca58aa8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 721.716249][ T1657] 1 lock held by syz-executor197/8524: [ 721.721751][ T1657] [ 721.724078][ T1657] ============================================= [ 721.724078][ T1657] [ 721.734382][ T1657] NMI backtrace for cpu 0 [ 721.738841][ T1657] CPU: 0 PID: 1657 Comm: khungtaskd Not tainted 5.11.0-rc4-syzkaller #0 [ 721.747174][ T1657] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.757236][ T1657] Call Trace: [ 721.760525][ T1657] dump_stack+0x107/0x163 [ 721.764937][ T1657] nmi_cpu_backtrace.cold+0x44/0xd7 [ 721.770146][ T1657] ? lapic_can_unplug_cpu+0x80/0x80 [ 721.775392][ T1657] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 721.781434][ T1657] watchdog+0xd43/0xfa0 [ 721.785672][ T1657] ? reset_hung_task_detector+0x30/0x30 [ 721.791233][ T1657] kthread+0x3b1/0x4a0 [ 721.795332][ T1657] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.801238][ T1657] ret_from_fork+0x1f/0x30 [ 721.805835][ T1657] Sending NMI from CPU 0 to CPUs 1: [ 721.812475][ C1] NMI backtrace for cpu 1 [ 721.812485][ C1] CPU: 1 PID: 8524 Comm: syz-executor197 Not tainted 5.11.0-rc4-syzkaller #0 [ 721.812495][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.812505][ C1] RIP: 0010:__mutex_unlock_slowpath+0xc7/0x610 [ 721.812517][ C1] Code: 00 00 49 c7 c4 60 e6 0b 8f 48 c7 c5 60 e6 0b 8f 4d 8b 37 48 b8 00 00 00 00 00 fc ff df 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 <65> 4c 8b 2c 25 00 f0 01 00 eb 27 4c 89 f3 be 08 00 00 00 4c 89 ff [ 721.812534][ C1] RSP: 0018:ffffc90001bd6c20 EFLAGS: 00000206 [ 721.812546][ C1] RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: ffffffff88fb585e [ 721.812555][ C1] RDX: ffffed100275f0c1 RSI: 0000000000000008 RDI: ffff888013af8600 [ 721.812564][ C1] RBP: 0000000000000003 R08: 0000000000000000 R09: ffff888013af8607 [ 721.812573][ C1] R10: ffffed100275f0c0 R11: 0000000000000000 R12: fffffbfff1e17ccc [ 721.812582][ C1] R13: 0000000000000001 R14: ffff8880146f5340 R15: ffff888013af8600 [ 721.812592][ C1] FS: 0000000001ab5880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 [ 721.812601][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 721.812609][ C1] CR2: 0000000020000280 CR3: 0000000011df0000 CR4: 00000000001506e0 [ 721.812618][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 721.812627][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 721.812634][ C1] Call Trace: [ 721.812639][ C1] ? wait_for_completion_io+0x260/0x260 [ 721.812645][ C1] ? __radix_tree_lookup+0x211/0x2a0 [ 721.812651][ C1] tcf_idr_check_alloc+0x29e/0x3b0 [ 721.812657][ C1] tcf_police_init+0x34f/0x1460 [ 721.812662][ C1] ? tcf_police_cleanup+0x60/0x60 [ 721.812668][ C1] ? find_held_lock+0x2d/0x110 [ 721.812673][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 721.812680][ C1] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 721.812686][ C1] ? __kernel_text_address+0x9/0x30 [ 721.812692][ C1] tcf_action_init_1+0x1a3/0x990 [ 721.812697][ C1] ? tcf_action_dump_old+0x80/0x80 [ 721.812703][ C1] ? find_held_lock+0x2d/0x110 [ 721.812709][ C1] ? pcpu_alloc+0x1239/0x16f0 [ 721.812714][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 721.812720][ C1] tcf_exts_validate+0x138/0x420 [ 721.812726][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 721.812731][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 721.812738][ C1] ? wait_for_completion_io+0x260/0x260 [ 721.812744][ C1] u32_set_parms+0xb9/0xc60 [ 721.812750][ C1] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 721.812756][ C1] ? u32_bind_class+0x2c0/0x2c0 [ 721.812762][ C1] u32_change+0x1f13/0x3000 [ 721.812767][ C1] ? u32_dump+0x1030/0x1030 [ 721.812772][ C1] ? blackhole_dequeue+0x10/0x10 [ 721.812778][ C1] ? u32_lookup_ht+0x1d0/0x1d0 [ 721.812784][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.812791][ C1] ? tc_new_tfilter+0x132a/0x2120 [ 721.812796][ C1] tc_new_tfilter+0x1394/0x2120 [ 721.812802][ C1] ? u32_dump+0x1030/0x1030 [ 721.812808][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.812813][ C1] ? lock_chain_count+0x20/0x20 [ 721.812819][ C1] ? kernel_text_address+0xbd/0xf0 [ 721.812825][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.812831][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 721.812836][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 721.812842][ C1] netlink_rcv_skb+0x153/0x420 [ 721.812848][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 721.812854][ C1] ? netlink_ack+0xaa0/0xaa0 [ 721.812860][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 721.812866][ C1] netlink_unicast+0x533/0x7d0 [ 721.812871][ C1] ? netlink_attachskb+0x870/0x870 [ 721.812877][ C1] ? _copy_from_iter_full+0x275/0x850 [ 721.812884][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.812890][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 721.812902][ C1] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 721.812908][ C1] ? __check_object_size+0x171/0x3f0 [ 721.812914][ C1] netlink_sendmsg+0x856/0xd90 [ 721.812920][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 721.812926][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.812933][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 721.812938][ C1] sock_sendmsg+0xcf/0x120 [ 721.812943][ C1] ____sys_sendmsg+0x331/0x810 [ 721.812949][ C1] ? kernel_sendmsg+0x50/0x50 [ 721.812954][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 721.812959][ C1] ? __lock_acquire+0x16c2/0x54f0 [ 721.812965][ C1] ___sys_sendmsg+0xf3/0x170 [ 721.812971][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 721.812977][ C1] ? find_held_lock+0x2d/0x110 [ 721.812982][ C1] ? __might_fault+0xd3/0x180 [ 721.812988][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 721.812993][ C1] __sys_sendmmsg+0x195/0x470 [ 721.812999][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 721.813005][ C1] ? find_held_lock+0x2d/0x110 [ 721.813010][ C1] ? alloc_file_pseudo+0x1/0x250 [ 721.813016][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.813023][ C1] ? fd_install+0x215/0x640 [ 721.813028][ C1] ? __sys_socket+0x16d/0x200 [ 721.813033][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 721.813039][ C1] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.813046][ C1] do_syscall_64+0x2d/0x70 [ 721.813051][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.813057][ C1] RIP: 0033:0x441769 [ 721.813067][ 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 [ 721.813083][ C1] RSP: 002b:00007ffd769e4c98 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 721.813095][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441769 [ 721.813103][ C1] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000004 [ 721.813111][ C1] RBP: 00007ffd769e4ca0 R08: 0000000120080522 R09: 0000000120080522 [ 721.813119][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2ab0 [ 721.813126][ C1] R13: 0000000000402640 R14: 0000000000000000 R15: 0000000000000000 [ 721.813135][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.365 msecs [ 721.826101][ T1657] Kernel panic - not syncing: hung_task: blocked tasks [ 722.400584][ T1657] CPU: 0 PID: 1657 Comm: khungtaskd Not tainted 5.11.0-rc4-syzkaller #0 [ 722.408922][ T1657] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 722.418983][ T1657] Call Trace: [ 722.422267][ T1657] dump_stack+0x107/0x163 [ 722.426614][ T1657] panic+0x306/0x73d [ 722.430560][ T1657] ? __warn_printk+0xf3/0xf3 [ 722.435166][ T1657] ? lapic_can_unplug_cpu+0x80/0x80 [ 722.440480][ T1657] ? preempt_schedule_thunk+0x16/0x18 [ 722.445884][ T1657] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 722.452229][ T1657] ? watchdog.cold+0x5/0x158 [ 722.456862][ T1657] watchdog.cold+0x16/0x158 [ 722.461383][ T1657] ? reset_hung_task_detector+0x30/0x30 [ 722.466948][ T1657] kthread+0x3b1/0x4a0 [ 722.471029][ T1657] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 722.476935][ T1657] ret_from_fork+0x1f/0x30 [ 722.482296][ T1657] Kernel Offset: disabled [ 722.486707][ T1657] Rebooting in 86400 seconds..