[ OK ] Started Load/Save RF Kill Switch Status. [ 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 '10.128.1.8' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 453.456881][ T6865] IPVS: ftp: loaded support on port[0] = 21 [ 616.389099][ T1177] INFO: task kworker/u4:3:88 blocked for more than 143 seconds. [ 616.396857][ T1177] Not tainted 5.9.0-rc8-syzkaller #0 [ 616.406374][ T1177] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.415927][ T1177] task:kworker/u4:3 state:D stack:25408 pid: 88 ppid: 2 flags:0x00004000 [ 616.426167][ T1177] Workqueue: tc_filter_workqueue tcindex_partial_destroy_work [ 616.434648][ T1177] Call Trace: [ 616.438023][ T1177] __schedule+0xec9/0x2280 [ 616.443632][ T1177] ? io_schedule_timeout+0x140/0x140 [ 616.448936][ T1177] schedule+0xd0/0x2a0 [ 616.454238][ T1177] schedule_preempt_disabled+0xf/0x20 [ 616.460486][ T1177] __mutex_lock+0x3e2/0x10e0 [ 616.465100][ T1177] ? tcindex_partial_destroy_work+0x13/0x50 [ 616.472574][ T1177] ? mutex_lock_io_nested+0xf60/0xf60 [ 616.478106][ T1177] ? process_one_work+0x85f/0x1670 [ 616.484574][ T1177] ? lock_release+0x8f0/0x8f0 [ 616.490305][ T1177] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.495527][ T1177] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.501973][ T1177] tcindex_partial_destroy_work+0x13/0x50 [ 616.507713][ T1177] process_one_work+0x94c/0x1670 [ 616.513909][ T1177] ? lock_release+0x8f0/0x8f0 [ 616.518608][ T1177] ? pwq_dec_nr_in_flight+0x320/0x320 [ 616.525242][ T1177] ? rwlock_bug.part.0+0x90/0x90 [ 616.532211][ T1177] ? lockdep_hardirqs_off+0x96/0xd0 [ 616.537430][ T1177] worker_thread+0x64c/0x1120 [ 616.544650][ T1177] ? process_one_work+0x1670/0x1670 [ 616.550996][ T1177] kthread+0x3b5/0x4a0 [ 616.555089][ T1177] ? __kthread_bind_mask+0xc0/0xc0 [ 616.561496][ T1177] ret_from_fork+0x1f/0x30 [ 616.567299][ T1177] [ 616.567299][ T1177] Showing all locks held in the system: [ 616.576369][ T1177] 3 locks held by kworker/0:1/12: [ 616.582942][ T1177] #0: ffff888214f98138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 616.594804][ T1177] #1: ffffc90000d2fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 616.605912][ T1177] #2: ffffffff8b17a308 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 616.616254][ T1177] 3 locks held by kworker/u4:3/88: [ 616.622124][ T1177] #0: ffff8880a5cfd938 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 616.634663][ T1177] #1: ffffc90001177da8 ((work_completion)(&(rwork)->work)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 616.647141][ T1177] #2: ffffffff8b17a308 (rtnl_mutex){+.+.}-{3:3}, at: tcindex_partial_destroy_work+0x13/0x50 [ 616.658422][ T1177] 1 lock held by khungtaskd/1177: [ 616.665531][ T1177] #0: ffffffff8a068480 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 616.676397][ T1177] 1 lock held by in:imklog/6757: [ 616.682269][ T1177] #0: ffff8880a1e856b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 616.692332][ T1177] 2 locks held by syz-executor958/6886: [ 616.697904][ T1177] [ 616.701367][ T1177] ============================================= [ 616.701367][ T1177] [ 616.710680][ T1177] NMI backtrace for cpu 0 [ 616.715103][ T1177] CPU: 0 PID: 1177 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 616.723325][ T1177] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.734755][ T1177] Call Trace: [ 616.738227][ T1177] dump_stack+0x198/0x1fd [ 616.742567][ T1177] nmi_cpu_backtrace.cold+0x70/0xb1 [ 616.747799][ T1177] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 616.753576][ T1177] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 616.759661][ T1177] watchdog+0xd7d/0x1000 [ 616.763909][ T1177] ? reset_hung_task_detector+0x30/0x30 [ 616.769461][ T1177] kthread+0x3b5/0x4a0 [ 616.773526][ T1177] ? __kthread_bind_mask+0xc0/0xc0 [ 616.778634][ T1177] ret_from_fork+0x1f/0x30 [ 616.783207][ T1177] Sending NMI from CPU 0 to CPUs 1: [ 616.790041][ C1] NMI backtrace for cpu 1 [ 616.790048][ C1] CPU: 1 PID: 6886 Comm: syz-executor958 Not tainted 5.9.0-rc8-syzkaller #0 [ 616.790055][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.790059][ C1] RIP: 0010:arch_local_irq_save+0x57/0x90 [ 616.790071][ C1] Code: 00 48 ba 00 00 00 00 00 fc ff df 49 89 c4 48 c7 c0 30 6c fc 89 48 c1 e8 03 80 3c 10 00 75 29 48 83 3d 3c 2c a1 08 00 74 0f fa <66> 0f 1f 44 00 00 4c 89 e0 41 5c c3 0f 0b 0f 0b 48 c7 c7 20 6c fc [ 616.790075][ C1] RSP: 0018:ffffc900054b6938 EFLAGS: 00000082 [ 616.790083][ C1] RAX: 1ffffffff13f8d86 RBX: 0000000000000000 RCX: ffffffff815c291e [ 616.790088][ C1] RDX: dffffc0000000000 RSI: 00000000ffffffff RDI: ffffffff8a0683c0 [ 616.790093][ C1] RBP: ffff888092eec1c0 R08: 0000000000000000 R09: ffffffff8b5cba8f [ 616.790098][ C1] R10: fffffbfff16b9751 R11: 0000000000000000 R12: 0000000000000286 [ 616.790103][ C1] R13: ffff888092eecac8 R14: 0000000000000000 R15: 0000000000000001 [ 616.790109][ C1] FS: 0000000000f51880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 616.790114][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 616.790119][ C1] CR2: 00000000006cd080 CR3: 0000000093c46000 CR4: 00000000001506e0 [ 616.790124][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 616.790129][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 616.790131][ C1] Call Trace: [ 616.790134][ C1] lock_is_held_type+0x3a/0xf0 [ 616.790138][ C1] rcu_read_lock_sched_held+0x3a/0xb0 [ 616.790141][ C1] lock_acquire+0x843/0xaf0 [ 616.790145][ C1] ? lock_release+0x8f0/0x8f0 [ 616.790148][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 616.790152][ C1] ? mark_lock+0x82/0x1660 [ 616.790155][ C1] ? lock_is_held_type+0xbb/0xf0 [ 616.790158][ C1] __mutex_lock+0x134/0x10e0 [ 616.790162][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 616.790166][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 616.790169][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 616.790173][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 616.790177][ C1] ? wait_for_completion+0x260/0x260 [ 616.790180][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 616.790184][ C1] tcf_police_init+0x347/0x13a0 [ 616.790187][ C1] ? tcf_police_cleanup+0x60/0x60 [ 616.790191][ C1] ? find_held_lock+0x2d/0x110 [ 616.790194][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 616.790197][ C1] tcf_action_init_1+0x1a3/0x990 [ 616.790201][ C1] ? tcf_action_dump_old+0x80/0x80 [ 616.790204][ C1] ? lock_acquire+0x1f3/0xaf0 [ 616.790208][ C1] ? lock_is_held_type+0xbb/0xf0 [ 616.790211][ C1] ? find_held_lock+0x2d/0x110 [ 616.790215][ C1] ? fs_reclaim_release+0x90/0xd0 [ 616.790218][ C1] ? mark_lock+0x82/0x1660 [ 616.790221][ C1] ? mark_lock+0x82/0x1660 [ 616.790225][ C1] tcf_exts_validate+0x138/0x420 [ 616.790228][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 616.790232][ C1] ? kmem_cache_alloc_trace+0x18e/0x300 [ 616.790235][ C1] tcindex_set_parms+0x189/0x20d0 [ 616.790239][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 616.790243][ C1] ? tcindex_alloc_perfect_hash+0x440/0x440 [ 616.790247][ C1] ? __nla_validate_parse+0x2d3/0x22d0 [ 616.790251][ C1] ? nla_get_range_signed+0x520/0x520 [ 616.790254][ C1] ? lock_is_held_type+0xbb/0xf0 [ 616.790257][ C1] ? lock_is_held_type+0xbb/0xf0 [ 616.790261][ C1] ? find_held_lock+0x2d/0x110 [ 616.790264][ C1] tcindex_change+0x203/0x2e0 [ 616.790268][ C1] ? tcindex_set_parms+0x20d0/0x20d0 [ 616.790271][ C1] ? tcindex_lookup+0x390/0x390 [ 616.790275][ C1] ? lockdep_rtnl_is_held+0x22/0x30 [ 616.790278][ C1] tc_new_tfilter+0x1398/0x2130 [ 616.790282][ C1] ? tcindex_set_parms+0x20d0/0x20d0 [ 616.790286][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 616.790290][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.790294][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 616.790297][ C1] ? lock_is_held_type+0xbb/0xf0 [ 616.790300][ C1] ? security_capable+0x8f/0xc0 [ 616.790304][ C1] ? lock_is_held_type+0xbb/0xf0 [ 616.790307][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 616.790311][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 616.790315][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 616.790318][ C1] ? lock_acquire+0x1f3/0xaf0 [ 616.790322][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 616.790325][ C1] netlink_rcv_skb+0x15a/0x430 [ 616.790329][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 616.790332][ C1] ? netlink_ack+0xa10/0xa10 [ 616.790336][ C1] ? __kmalloc_node_track_caller+0x38/0x60 [ 616.790339][ C1] netlink_unicast+0x533/0x7d0 [ 616.790343][ C1] ? netlink_attachskb+0x810/0x810 [ 616.790347][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 616.790350][ C1] ? __check_object_size+0x171/0x3e4 [ 616.790354][ C1] netlink_sendmsg+0x856/0xd90 [ 616.790357][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 616.790361][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 616.790364][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 616.790367][ C1] sock_sendmsg+0xcf/0x120 [ 616.790371][ C1] ____sys_sendmsg+0x331/0x810 [ 616.790374][ C1] ? kernel_sendmsg+0x50/0x50 [ 616.790377][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 616.790381][ C1] ? __lock_acquire+0x164a/0x5780 [ 616.790384][ C1] ___sys_sendmsg+0xf3/0x170 [ 616.790388][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 616.790392][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 616.790395][ C1] ? fs_reclaim_release+0x90/0xd0 [ 616.790399][ C1] ? lock_is_held_type+0xbb/0xf0 [ 616.790402][ C1] ? find_held_lock+0x2d/0x110 [ 616.790404][ C1] ? __might_fault+0x11f/0x1d0 [ 616.790407][ C1] ? lock_downgrade+0x830/0x830 [ 616.790410][ C1] ? lock_is_held_type+0xbb/0xf0 [ 616.790413][ C1] __sys_sendmmsg+0x195/0x480 [ 616.790416][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 616.790419][ C1] ? find_held_lock+0x2d/0x110 [ 616.790428][ C1] ? __fd_install+0x1b4/0x600 [ 616.790431][ C1] ? alloc_file_pseudo+0x1/0x250 [ 616.790434][ C1] ? lock_is_held_type+0xbb/0xf0 [ 616.790437][ C1] ? __fd_install+0x1e6/0x600 [ 616.790440][ C1] ? __sys_socket+0x16d/0x200 [ 616.790443][ C1] ? lock_is_held_type+0xbb/0xf0 [ 616.790446][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 616.790449][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 616.790453][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 616.790456][ C1] do_syscall_64+0x2d/0x70 [ 616.790459][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.790462][ C1] RIP: 0033:0x441889 [ 616.790473][ 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 [ 616.790476][ C1] RSP: 002b:00007ffe17deefe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 616.790484][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441889 [ 616.790489][ C1] RDX: 04924924924924b3 RSI: 0000000020000200 RDI: 0000000000000004 [ 616.790493][ C1] RBP: 00007ffe17deeff0 R08: 0000000120080522 R09: 0000000120080522 [ 616.790498][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2c90 [ 616.790503][ C1] R13: 0000000000402760 R14: 0000000000000000 R15: 0000000000000000 [ 616.790508][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 616.808973][ T1177] Kernel panic - not syncing: hung_task: blocked tasks [ 617.485867][ T1177] CPU: 0 PID: 1177 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 617.494091][ T1177] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 617.504131][ T1177] Call Trace: [ 617.507447][ T1177] dump_stack+0x198/0x1fd [ 617.511835][ T1177] panic+0x382/0x7fb [ 617.515726][ T1177] ? __warn_printk+0xf3/0xf3 [ 617.520325][ T1177] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 617.525949][ T1177] ? preempt_schedule_thunk+0x16/0x18 [ 617.531312][ T1177] ? watchdog.cold+0x5/0x16b [ 617.535893][ T1177] ? watchdog+0xa82/0x1000 [ 617.540304][ T1177] watchdog.cold+0x16/0x16b [ 617.544807][ T1177] ? reset_hung_task_detector+0x30/0x30 [ 617.550440][ T1177] kthread+0x3b5/0x4a0 [ 617.554505][ T1177] ? __kthread_bind_mask+0xc0/0xc0 [ 617.559608][ T1177] ret_from_fork+0x1f/0x30 [ 617.565957][ T1177] Kernel Offset: disabled [ 617.570289][ T1177] Rebooting in 86400 seconds..