[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 28.935135] kauditd_printk_skb: 8 callbacks suppressed [ 28.935147] audit: type=1800 audit(1544512161.996:29): pid=5898 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 28.967038] audit: type=1800 audit(1544512161.996:30): pid=5898 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts. 2018/12/11 07:22:28 parsed 1 programs 2018/12/11 07:22:30 executed programs: 0 syzkaller login: [ 817.165386] IPVS: ftp: loaded support on port[0] = 21 [ 817.415233] bridge0: port 1(bridge_slave_0) entered blocking state [ 817.422200] bridge0: port 1(bridge_slave_0) entered disabled state [ 817.429841] device bridge_slave_0 entered promiscuous mode [ 817.448577] bridge0: port 2(bridge_slave_1) entered blocking state [ 817.455030] bridge0: port 2(bridge_slave_1) entered disabled state [ 817.461919] device bridge_slave_1 entered promiscuous mode [ 817.479351] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 817.498006] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 817.548341] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 817.568463] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 817.649767] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 817.657237] team0: Port device team_slave_0 added [ 817.674415] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 817.681507] team0: Port device team_slave_1 added [ 817.698363] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 817.721093] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 817.741478] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 817.760944] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 817.904601] bridge0: port 2(bridge_slave_1) entered blocking state [ 817.911139] bridge0: port 2(bridge_slave_1) entered forwarding state [ 817.918119] bridge0: port 1(bridge_slave_0) entered blocking state [ 817.924487] bridge0: port 1(bridge_slave_0) entered forwarding state [ 818.440577] 8021q: adding VLAN 0 to HW filter on device bond0 [ 818.494495] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 818.545647] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 818.551761] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 818.560433] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 818.608066] 8021q: adding VLAN 0 to HW filter on device team0 [ 967.052555] INFO: task syz-executor0:6338 blocked for more than 140 seconds. [ 967.060006] Not tainted 4.20.0-rc6+ #371 [ 967.064990] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 967.073129] syz-executor0 D22440 6338 6070 0x00000004 [ 967.078752] Call Trace: [ 967.081358] __schedule+0x8cf/0x21d0 [ 967.088290] ? __sched_text_start+0x8/0x8 [ 967.093169] ? print_usage_bug+0xc0/0xc0 [ 967.097261] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 967.101829] ? zap_class+0x640/0x640 [ 967.105781] ? zap_class+0x640/0x640 [ 967.109490] ? zap_class+0x640/0x640 [ 967.113397] ? find_held_lock+0x36/0x1c0 [ 967.117457] schedule+0xfe/0x460 [ 967.120830] ? __mutex_lock+0xafa/0x16f0 [ 967.125154] ? __schedule+0x21d0/0x21d0 [ 967.129160] ? kasan_check_read+0x11/0x20 [ 967.133511] ? do_raw_spin_unlock+0xa7/0x330 [ 967.137959] ? do_raw_spin_trylock+0x270/0x270 [ 967.142854] ? ww_mutex_lock.part.8+0xf0/0xf0 [ 967.147350] ? mutex_destroy+0x200/0x200 [ 967.151404] schedule_preempt_disabled+0x13/0x20 [ 967.156405] __mutex_lock+0xaff/0x16f0 [ 967.160339] ? ctrl_getfamily+0x313/0x420 [ 967.164751] ? mutex_trylock+0x2b0/0x2b0 [ 967.168807] ? find_held_lock+0x36/0x1c0 [ 967.173056] ? zap_class+0x640/0x640 [ 967.176770] ? find_held_lock+0x36/0x1c0 [ 967.180827] ? lock_acquire+0x1ed/0x520 [ 967.185036] ? ctrl_getfamily+0x305/0x420 [ 967.189179] ? lock_release+0xa00/0xa00 [ 967.193555] ? mutex_trylock+0x2b0/0x2b0 [ 967.197640] ? down_read+0x8d/0x120 [ 967.201256] ? ctrl_getfamily+0x305/0x420 [ 967.205633] ? __down_interruptible+0x700/0x700 [ 967.210360] ? __nla_parse+0x12c/0x3e0 [ 967.214442] mutex_lock_nested+0x16/0x20 [ 967.218495] ? mutex_lock_nested+0x16/0x20 [ 967.223404] ctrl_getfamily+0x313/0x420 [ 967.227384] genl_family_rcv_msg+0x8a7/0x11a0 [ 967.231872] ? genl_unregister_family+0x8a0/0x8a0 [ 967.236964] ? lock_downgrade+0x900/0x900 [ 967.241171] ? check_preemption_disabled+0x48/0x280 [ 967.246471] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 967.251401] ? kasan_check_read+0x11/0x20 [ 967.255763] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 967.261030] ? rcu_softirq_qs+0x20/0x20 [ 967.265296] genl_rcv_msg+0xc6/0x168 [ 967.269007] netlink_rcv_skb+0x172/0x440 [ 967.273253] ? genl_family_rcv_msg+0x11a0/0x11a0 [ 967.278002] ? netlink_ack+0xb80/0xb80 [ 967.281874] ? down_read+0x8d/0x120 [ 967.285860] genl_rcv+0x28/0x40 [ 967.289137] netlink_unicast+0x5a5/0x760 [ 967.293573] ? netlink_attachskb+0x9a0/0x9a0 [ 967.298048] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 967.303843] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 967.308852] netlink_sendmsg+0xa18/0xfc0 [ 967.313185] ? netlink_unicast+0x760/0x760 [ 967.317449] ? aa_sock_msg_perm.isra.14+0xba/0x160 [ 967.322617] ? apparmor_socket_sendmsg+0x29/0x30 [ 967.327365] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 967.333114] ? security_socket_sendmsg+0x94/0xc0 [ 967.337863] ? netlink_unicast+0x760/0x760 [ 967.342118] sock_sendmsg+0xd5/0x120 [ 967.346046] ___sys_sendmsg+0x7fd/0x930 [ 967.350013] ? find_held_lock+0x36/0x1c0 [ 967.355059] ? copy_msghdr_from_user+0x580/0x580 [ 967.359860] ? __fd_install+0x2b5/0x8f0 [ 967.364072] ? check_preemption_disabled+0x48/0x280 [ 967.369098] ? __fget_light+0x2e9/0x430 [ 967.373253] ? fget_raw+0x20/0x20 [ 967.376710] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 967.382449] ? __fd_install+0x2f9/0x8f0 [ 967.386434] ? get_unused_fd_flags+0x1a0/0x1a0 [ 967.391020] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 967.396760] ? sockfd_lookup_light+0xc5/0x160 [ 967.401253] __sys_sendmsg+0x11d/0x280 [ 967.405343] ? __ia32_sys_shutdown+0x80/0x80 [ 967.409767] ? do_syscall_64+0x9a/0x820 [ 967.413955] ? do_syscall_64+0x9a/0x820 [ 967.417959] ? trace_hardirqs_off_caller+0x310/0x310 [ 967.423349] __x64_sys_sendmsg+0x78/0xb0 [ 967.427422] do_syscall_64+0x1b9/0x820 [ 967.431293] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 967.436863] ? syscall_return_slowpath+0x5e0/0x5e0 [ 967.441789] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 967.446874] ? trace_hardirqs_on_caller+0x310/0x310 [ 967.451894] ? prepare_exit_to_usermode+0x291/0x3b0 [ 967.457112] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 967.461951] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 967.467345] RIP: 0033:0x411231 [ 967.470530] Code: 01 4c 89 54 24 28 e9 6f fa ff ff 49 8b 7c 24 70 8b 35 43 c4 24 00 ff 15 ed 83 24 00 85 c0 0f 85 b3 fe ff ff 49 8b 7c 24 70 be <20> 13 41 00 ff 15 dd 83 24 00 85 c0 0f 85 9b fe ff ff 49 8b 7c 24 [ 967.490233] RSP: 002b:00007f725b6d39c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e [ 967.498128] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000411231 [ 967.505602] RDX: 0000000000000000 RSI: 00007f725b6d3a00 RDI: 0000000000000007 [ 967.513063] RBP: 0000000000000007 R08: 00007f725b6d39d0 R09: 000000000072bf00 [ 967.520325] R10: 0000000000000000 R11: 0000000000000293 R12: 00007f725b6d3a40 [ 967.527883] R13: 00000000004cc498 R14: 00000000004d9968 R15: 00000000ffffffff [ 967.535440] [ 967.535440] Showing all locks held in the system: [ 967.541763] 1 lock held by khungtaskd/1019: [ 967.546414] #0: 000000009ec09f77 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 [ 967.555244] 1 lock held by rsyslogd/5937: [ 967.559378] #0: 0000000030438a66 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 [ 967.567595] 2 locks held by getty/6027: [ 967.571560] #0: 000000007563c8fc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 967.580061] #1: 0000000059b623ab (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 [ 967.589239] 2 locks held by getty/6028: [ 967.593407] #0: 000000002ba60a3b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 967.601647] #1: 000000008ef9862d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 [ 967.610964] 2 locks held by getty/6029: [ 967.615583] #0: 00000000703e6eaf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 967.624073] #1: 00000000376232b3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 [ 967.633193] 2 locks held by getty/6030: [ 967.637160] #0: 0000000097fe0bf0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 967.645703] #1: 00000000457b863d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 [ 967.654808] 2 locks held by getty/6031: [ 967.658769] #0: 00000000efc3f177 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 967.667258] #1: 000000003179d3b2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 [ 967.676304] 2 locks held by getty/6032: [ 967.680263] #0: 000000007a941c46 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 967.688715] #1: 00000000d81e3e89 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 [ 967.697816] 2 locks held by getty/6033: [ 967.701778] #0: 000000000d5e5061 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 967.710211] #1: 000000004fc6ffbd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 [ 967.719418] 2 locks held by syz-executor0/6338: [ 967.724275] #0: 00000000ea301de4 (cb_lock){++++}, at: ctrl_getfamily+0x305/0x420 [ 967.731899] #1: 000000000c68c526 (genl_mutex){+.+.}, at: ctrl_getfamily+0x313/0x420 [ 967.739978] 3 locks held by syz-executor0/6340: [ 967.745290] [ 967.746907] ============================================= [ 967.746907] [ 967.754288] NMI backtrace for cpu 0 [ 967.757912] CPU: 0 PID: 1019 Comm: khungtaskd Not tainted 4.20.0-rc6+ #371 [ 967.764903] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 967.774236] Call Trace: [ 967.776963] dump_stack+0x244/0x39d [ 967.780591] ? dump_stack_print_info.cold.1+0x20/0x20 [ 967.785766] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 967.791291] nmi_cpu_backtrace.cold.2+0x5c/0xa1 [ 967.795994] ? lapic_can_unplug_cpu.cold.27+0x3f/0x3f [ 967.801174] nmi_trigger_cpumask_backtrace+0x1e8/0x22a [ 967.806522] arch_trigger_cpumask_backtrace+0x14/0x20 [ 967.811699] watchdog+0xb51/0x1060 [ 967.815229] ? hungtask_pm_notify+0xb0/0xb0 [ 967.819571] ? __kthread_parkme+0xce/0x1a0 [ 967.823792] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 967.828877] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 967.833963] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 967.838529] ? trace_hardirqs_on+0xbd/0x310 [ 967.842838] ? kasan_check_read+0x11/0x20 [ 967.846971] ? __kthread_parkme+0xce/0x1a0 [ 967.851187] ? trace_hardirqs_off_caller+0x310/0x310 [ 967.856278] ? trace_hardirqs_off_caller+0x310/0x310 [ 967.861370] ? lockdep_init_map+0x9/0x10 [ 967.865426] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 967.870643] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 967.876176] ? __kthread_parkme+0xfb/0x1a0 [ 967.880402] ? hungtask_pm_notify+0xb0/0xb0 [ 967.884712] kthread+0x35a/0x440 [ 967.888064] ? kthread_stop+0x900/0x900 [ 967.892023] ret_from_fork+0x3a/0x50 [ 967.895834] Sending NMI from CPU 0 to CPUs 1: [ 967.901672] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.160 msecs [ 967.902328] NMI backtrace for cpu 1 [ 967.902333] CPU: 1 PID: 6340 Comm: syz-executor0 Not tainted 4.20.0-rc6+ #371 [ 967.902338] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 967.902341] RIP: 0010:write_comp_data+0x22/0x70 [ 967.902349] Code: 90 90 90 90 90 90 90 90 55 48 89 e5 65 4c 8b 04 25 40 ee 01 00 65 8b 05 bc 69 82 7e a9 00 01 1f 00 75 51 41 8b 80 d8 12 00 00 <83> f8 03 75 45 49 8b 80 e0 12 00 00 45 8b 80 dc 12 00 00 4c 8b 08 [ 967.902352] RSP: 0018:ffff8881baa96920 EFLAGS: 00000246 [ 967.902358] RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffffffff83a4ba0d [ 967.902362] RDX: 0000000000000002 RSI: 000000000000000a RDI: 0000000000000004 [ 967.902365] RBP: ffff8881baa96920 R08: ffff8881bbf9e180 R09: ffff8881c60ef300 [ 967.902369] R10: ffffed1038c1de6a R11: ffff8881c60ef357 R12: 000000000000000a [ 967.902373] R13: 0000000000000000 R14: ffff8881bad74954 R15: ffffffff88d3bf80 [ 967.902377] FS: 00007f725b6b3700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000 [ 967.902380] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 967.902384] CR2: ffffffffff600400 CR3: 00000001bb400000 CR4: 00000000001406e0 [ 967.902387] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 967.902391] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 967.902393] Call Trace: [ 967.902396] __sanitizer_cov_trace_cmp4+0x16/0x20 [ 967.902398] validate_nla+0xed/0x1650 [ 967.902401] ? tipc_connect+0x820/0x820 [ 967.902403] ? nla_memcmp+0x90/0x90 [ 967.902405] ? zap_class+0x640/0x640 [ 967.902408] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 967.902410] ? retint_kernel+0x2d/0x2d [ 967.902412] __nla_parse+0x2f4/0x3e0 [ 967.902415] nla_parse+0x46/0x60 [ 967.902417] tipc_nlmsg_parse+0xb8/0xf0 [ 967.902419] tipc_nl_publ_dump+0x92c/0xf93 [ 967.902422] ? tipc_nl_sk_dump+0x30/0x30 [ 967.902425] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 967.902427] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 967.902430] ? retint_kernel+0x2d/0x2d [ 967.902432] ? trace_hardirqs_on_caller+0xc0/0x310 [ 967.902435] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 967.902438] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 967.902440] ? retint_kernel+0x1b/0x2d [ 967.902443] ? trace_hardirqs_on+0x310/0x310 [ 967.902446] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 967.902449] ? __tipc_nl_compat_dumpit.isra.11+0x641/0xb60 [ 967.902451] __tipc_nl_compat_dumpit.isra.11+0x25d/0xb60 [ 967.902454] ? __alloc_skb+0x4c6/0x770 [ 967.902457] ? __tipc_add_link_prop.isra.9+0x2d0/0x2d0 [ 967.902459] ? skb_put+0x17b/0x1e0 [ 967.902462] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 967.902464] ? skb_put+0x17b/0x1e0 [ 967.902466] ? nla_put+0x117/0x150 [ 967.902469] tipc_nl_compat_sk_dump+0x88e/0xc50 [ 967.902472] ? __tipc_nl_compat_dumpit.isra.11+0xb60/0xb60 [ 967.902474] ? rcu_softirq_qs+0x20/0x20 [ 967.902477] ? zap_class+0x640/0x640 [ 967.902479] ? rhashtable_walk_next+0x2a9/0x6c0 [ 967.902482] ? tipc_nl_sk_dump+0x30/0x30 [ 967.902484] ? tipc_tlv_sprintf+0x2e0/0x2e0 [ 967.902487] ? rhashtable_walk_stop+0x1ca/0x450 [ 967.902489] ? release_sock+0x1ec/0x2c0 [ 967.902492] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 967.902495] ? __tipc_nl_compat_dumpit.isra.11+0xb60/0xb60 [ 967.902498] __tipc_nl_compat_dumpit.isra.11+0x389/0xb60 [ 967.902501] ? __alloc_skb+0x4c6/0x770 [ 967.902503] ? __tipc_add_link_prop.isra.9+0x2d0/0x2d0 [ 967.902506] ? lock_release+0xa00/0xa00 [ 967.902509] ? perf_trace_sched_process_exec+0x860/0x860 [ 967.902512] ? check_preemption_disabled+0x48/0x280 [ 967.902514] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 967.902517] ? skb_put+0x17b/0x1e0 [ 967.902519] tipc_nl_compat_dumpit+0x1f4/0x440 [ 967.902522] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 967.902525] tipc_nl_compat_recv+0x12b3/0x19a0 [ 967.902527] ? tipc_nl_compat_doit+0x650/0x650 [ 967.902530] ? tipc_dump_start+0x90/0x90 [ 967.902533] ? __tipc_nl_compat_dumpit.isra.11+0xb60/0xb60 [ 967.902535] ? find_held_lock+0x36/0x1c0 [ 967.902538] genl_family_rcv_msg+0x8a7/0x11a0 [ 967.902541] ? genl_unregister_family+0x8a0/0x8a0 [ 967.902543] ? lock_downgrade+0x900/0x900 [ 967.902546] ? check_preemption_disabled+0x48/0x280 [ 967.902549] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 967.902551] ? kasan_check_read+0x11/0x20 [ 967.902554] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 967.902556] ? rcu_softirq_qs+0x20/0x20 [ 967.902558] genl_rcv_msg+0xc6/0x168 [ 967.902561] netlink_rcv_skb+0x172/0x440 [ 967.902564] ? genl_family_rcv_msg+0x11a0/0x11a0 [ 967.902566] ? netlink_ack+0xb80/0xb80 [ 967.902568] ? down_read+0x8d/0x120 [ 967.902570] genl_rcv+0x28/0x40 [ 967.902573] netlink_unicast+0x5a5/0x760 [ 967.902575] ? netlink_attachskb+0x9a0/0x9a0 [ 967.902578] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 967.902581] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 967.902583] netlink_sendmsg+0xa18/0xfc0 [ 967.902586] ? netlink_unicast+0x760/0x760 [ 967.902589] ? aa_sock_msg_perm.isra.14+0xba/0x160 [ 967.902592] ? apparmor_socket_sendmsg+0x29/0x30 [ 967.902595] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 967.902597] ? security_socket_sendmsg+0x94/0xc0 [ 967.902600] ? netlink_unicast+0x760/0x760 [ 967.902602] sock_sendmsg+0xd5/0x120 [ 967.902605] ___sys_sendmsg+0x7fd/0x930 [ 967.902607] ? copy_msghdr_from_user+0x580/0x580 [ 967.902610] ? __fget_light+0x2e9/0x430 [ 967.902612] ? fget_raw+0x20/0x20 [ 967.902615] ? __might_fault+0x12b/0x1e0 [ 967.902617] ? lock_downgrade+0x900/0x900 [ 967.902619] ? lock_release+0xa00/0xa00 [ 967.902622] ? perf_trace_sched_process_exec+0x860/0x860 [ 967.902625] ? posix_ktime_get_ts+0x15/0x20 [ 967.902628] ? trace_hardirqs_off_caller+0x310/0x310 [ 967.902630] ? trace_hardirqs_on+0xbd/0x310 [ 967.902633] ? kasan_check_read+0x11/0x20 [ 967.902636] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 967.902638] ? sockfd_lookup_light+0xc5/0x160 [ 967.902641] __sys_sendmsg+0x11d/0x280 [ 967.902643] ? __ia32_sys_shutdown+0x80/0x80 [ 967.902646] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 967.902649] ? put_timespec64+0x10f/0x1b0 [ 967.902651] ? do_syscall_64+0x9a/0x820 [ 967.902653] ? do_syscall_64+0x9a/0x820 [ 967.902656] ? trace_hardirqs_off_caller+0x310/0x310 [ 967.902659] __x64_sys_sendmsg+0x78/0xb0 [ 967.902661] do_syscall_64+0x1b9/0x820 [ 967.902664] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 967.902667] ? syscall_return_slowpath+0x5e0/0x5e0 [ 967.902669] ? trace_hardirqs_on_caller+0x310/0x310 [ 967.902672] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 967.902676] ? post_copy_siginfo_from_user.isra.25.part.26+0x250/0x250 [ 967.902678] ? __switch_to_asm+0x40/0x70 [ 967.902687] ? __switch_to_asm+0x34/0x70 [ 967.902690] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 967.902693] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 967.902695] RIP: 0033:0x457659 [ 967.902703] Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 967.902706] RSP: 002b:00007f725b6b2c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 967.902713] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457659 [ 967.902716] RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000005 [ 967.902720] RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 [ 967.902724] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f725b6b36d4 [ 967.902727] R13: 00000000004c4171 R14: 00000000004d7058 R15: 00000000ffffffff [ 967.906154] Kernel panic - not syncing: hung_task: blocked tasks [ 968.611822] CPU: 0 PID: 1019 Comm: khungtaskd Not tainted 4.20.0-rc6+ #371 [ 968.618817] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 968.628155] Call Trace: [ 968.630775] dump_stack+0x244/0x39d [ 968.634395] ? dump_stack_print_info.cold.1+0x20/0x20 [ 968.639629] panic+0x2ad/0x55c [ 968.642812] ? add_taint.cold.5+0x16/0x16 [ 968.646946] ? nmi_trigger_cpumask_backtrace+0x1c8/0x22a [ 968.652380] ? nmi_trigger_cpumask_backtrace+0x1f9/0x22a [ 968.657812] ? nmi_trigger_cpumask_backtrace+0x1d1/0x22a [ 968.663337] ? nmi_trigger_cpumask_backtrace+0x1c8/0x22a [ 968.668783] watchdog+0xb62/0x1060 [ 968.672313] ? hungtask_pm_notify+0xb0/0xb0 [ 968.676642] ? __kthread_parkme+0xce/0x1a0 [ 968.680899] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 968.686021] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 968.691131] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 968.695728] ? trace_hardirqs_on+0xbd/0x310 [ 968.700061] ? kasan_check_read+0x11/0x20 [ 968.704216] ? __kthread_parkme+0xce/0x1a0 [ 968.708463] ? trace_hardirqs_off_caller+0x310/0x310 [ 968.713576] ? trace_hardirqs_off_caller+0x310/0x310 [ 968.718694] ? lockdep_init_map+0x9/0x10 [ 968.722775] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 968.727885] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 968.733426] ? __kthread_parkme+0xfb/0x1a0 [ 968.737673] ? hungtask_pm_notify+0xb0/0xb0 [ 968.742038] kthread+0x35a/0x440 [ 968.745442] ? kthread_stop+0x900/0x900 [ 968.749422] ret_from_fork+0x3a/0x50 [ 968.754276] Kernel Offset: disabled [ 968.757904] Rebooting in 86400 seconds..