[ 34.207033] audit: type=1800 audit(1550390062.726:27): pid=7434 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 34.245548] audit: type=1800 audit(1550390062.726:28): pid=7434 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.735596] audit: type=1800 audit(1550390063.316:29): pid=7434 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 [ 34.761705] audit: type=1800 audit(1550390063.316:30): pid=7434 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 '10.128.0.121' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 850.445177] INFO: task syz-executor725:8005 blocked for more than 140 seconds. [ 850.452824] Not tainted 5.0.0-rc6+ #75 [ 850.457827] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 850.466115] syz-executor725 D27984 8005 7591 0x00000004 [ 850.472048] Call Trace: [ 850.474642] __schedule+0x817/0x1cc0 [ 850.478452] ? __mutex_lock+0x721/0x1310 [ 850.482514] ? pci_mmcfg_check_reserved+0x170/0x170 [ 850.487643] schedule+0x92/0x180 [ 850.490999] schedule_preempt_disabled+0x13/0x20 [ 850.495854] __mutex_lock+0x726/0x1310 [ 850.499901] ? rtnetlink_rcv_msg+0x40a/0xb00 [ 850.504295] ? refcount_dec_and_test_checked+0x1b/0x20 [ 850.509806] ? mutex_trylock+0x1e0/0x1e0 [ 850.513891] ? rtnetlink_rcv_msg+0x3d0/0xb00 [ 850.518401] ? lock_downgrade+0x810/0x810 [ 850.522635] mutex_lock_nested+0x16/0x20 [ 850.526842] ? mutex_lock_nested+0x16/0x20 [ 850.531071] rtnetlink_rcv_msg+0x40a/0xb00 [ 850.535394] ? rtnetlink_put_metrics+0x560/0x560 [ 850.540154] ? netlink_deliver_tap+0x22d/0xbf0 [ 850.544715] ? find_held_lock+0x35/0x130 [ 850.548927] netlink_rcv_skb+0x17a/0x460 [ 850.552982] ? rtnetlink_put_metrics+0x560/0x560 [ 850.557838] ? netlink_ack+0xb50/0xb50 [ 850.561741] ? kasan_check_read+0x11/0x20 [ 850.565977] ? netlink_deliver_tap+0x254/0xbf0 [ 850.570551] rtnetlink_rcv+0x1d/0x30 [ 850.574249] netlink_unicast+0x536/0x720 [ 850.578405] ? netlink_attachskb+0x770/0x770 [ 850.582811] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 850.588334] ? __check_object_size+0x3d/0x42f [ 850.592917] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 850.598033] netlink_sendmsg+0x8ae/0xd70 [ 850.602094] ? netlink_unicast+0x720/0x720 [ 850.606403] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 850.611305] ? apparmor_socket_sendmsg+0x2a/0x30 [ 850.616168] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 850.621696] ? security_socket_sendmsg+0x93/0xc0 [ 850.626524] ? netlink_unicast+0x720/0x720 [ 850.630750] sock_sendmsg+0xdd/0x130 [ 850.634466] ___sys_sendmsg+0x806/0x930 [ 850.638529] ? copy_msghdr_from_user+0x430/0x430 [ 850.643302] ? __local_bh_enable_ip+0x15a/0x270 [ 850.648040] ? lockdep_hardirqs_on+0x415/0x5d0 [ 850.652609] ? release_sock+0x158/0x1c0 [ 850.656842] ? trace_hardirqs_on+0x67/0x230 [ 850.661260] ? release_sock+0x158/0x1c0 [ 850.665355] ? __local_bh_enable_ip+0x15a/0x270 [ 850.670018] ? _raw_spin_unlock_bh+0x31/0x40 [ 850.674415] ? release_sock+0x158/0x1c0 [ 850.678563] ? sock_setsockopt+0x197/0x2030 [ 850.682874] ? sock_enable_timestamp+0xe0/0xe0 [ 850.687542] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 850.692467] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 850.698116] ? __fget_light+0x1a9/0x230 [ 850.702095] ? __fdget+0x1b/0x20 [ 850.705549] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 850.711085] __sys_sendmsg+0x105/0x1d0 [ 850.715493] ? __ia32_sys_shutdown+0x80/0x80 [ 850.719905] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 850.724695] ? do_syscall_64+0x26/0x610 [ 850.728784] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 850.734140] ? do_syscall_64+0x26/0x610 [ 850.738228] __x64_sys_sendmsg+0x78/0xb0 [ 850.742287] do_syscall_64+0x103/0x610 [ 850.746282] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 850.751462] RIP: 0033:0x4459f9 [ 850.754642] Code: ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 <7a> fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd [ 850.773635] RSP: 002b:00007ffdc979ac28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 850.781439] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004459f9 [ 850.788932] RDX: 00000000000000c4 RSI: 0000000020000300 RDI: 0000000000000003 [ 850.796305] RBP: 00000000000ac037 R08: 00000000004002c8 R09: 00000000004002c8 [ 850.803578] R10: 00000000200015a6 R11: 0000000000000246 R12: 0000000000406890 [ 850.810953] R13: 0000000000406920 R14: 0000000000000000 R15: 0000000000000000 [ 850.818326] INFO: task syz-executor725:8008 blocked for more than 140 seconds. [ 850.825788] Not tainted 5.0.0-rc6+ #75 [ 850.830184] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 850.838258] syz-executor725 D27552 8008 7590 0x00000004 [ 850.843879] Call Trace: [ 850.846962] __schedule+0x817/0x1cc0 [ 850.850669] ? __mutex_lock+0x721/0x1310 [ 850.854726] ? pci_mmcfg_check_reserved+0x170/0x170 [ 850.859861] schedule+0x92/0x180 [ 850.863225] schedule_preempt_disabled+0x13/0x20 [ 850.868077] __mutex_lock+0x726/0x1310 [ 850.871965] ? rtnetlink_rcv_msg+0x40a/0xb00 [ 850.876484] ? refcount_dec_and_test_checked+0x1b/0x20 [ 850.881760] ? mutex_trylock+0x1e0/0x1e0 [ 850.885912] ? rtnetlink_rcv_msg+0x3d0/0xb00 [ 850.890321] ? lock_downgrade+0x810/0x810 [ 850.894521] mutex_lock_nested+0x16/0x20 [ 850.898685] ? mutex_lock_nested+0x16/0x20 [ 850.902914] rtnetlink_rcv_msg+0x40a/0xb00 [ 850.907230] ? rtnetlink_put_metrics+0x560/0x560 [ 850.911974] ? netlink_deliver_tap+0x22d/0xbf0 [ 850.916787] ? find_held_lock+0x35/0x130 [ 850.920852] netlink_rcv_skb+0x17a/0x460 [ 850.924987] ? rtnetlink_put_metrics+0x560/0x560 [ 850.929731] ? netlink_ack+0xb50/0xb50 [ 850.933600] ? kasan_check_read+0x11/0x20 [ 850.937831] ? netlink_deliver_tap+0x254/0xbf0 [ 850.942406] rtnetlink_rcv+0x1d/0x30 [ 850.946198] netlink_unicast+0x536/0x720 [ 850.950249] ? netlink_attachskb+0x770/0x770 [ 850.954634] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 850.959734] ? __check_object_size+0x3d/0x42f [ 850.964214] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 850.969425] netlink_sendmsg+0x8ae/0xd70 [ 850.973479] ? netlink_unicast+0x720/0x720 [ 850.978130] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 850.983004] ? apparmor_socket_sendmsg+0x2a/0x30 [ 850.987850] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 850.993639] ? security_socket_sendmsg+0x93/0xc0 [ 850.998745] ? netlink_unicast+0x720/0x720 [ 851.002969] sock_sendmsg+0xdd/0x130 [ 851.006744] ___sys_sendmsg+0x806/0x930 [ 851.010731] ? copy_msghdr_from_user+0x430/0x430 [ 851.015567] ? __local_bh_enable_ip+0x15a/0x270 [ 851.020226] ? lockdep_hardirqs_on+0x415/0x5d0 [ 851.024980] ? release_sock+0x158/0x1c0 [ 851.029002] ? trace_hardirqs_on+0x67/0x230 [ 851.033310] ? release_sock+0x158/0x1c0 [ 851.037389] ? __local_bh_enable_ip+0x15a/0x270 [ 851.042044] ? _raw_spin_unlock_bh+0x31/0x40 [ 851.046537] ? release_sock+0x158/0x1c0 [ 851.050521] ? sock_setsockopt+0x197/0x2030 [ 851.055005] ? sock_enable_timestamp+0xe0/0xe0 [ 851.059609] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 851.064519] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 851.070132] ? __fget_light+0x1a9/0x230 [ 851.074103] ? __fdget+0x1b/0x20 [ 851.077575] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 851.083104] __sys_sendmsg+0x105/0x1d0 [ 851.087065] ? __ia32_sys_shutdown+0x80/0x80 [ 851.091484] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 851.096489] ? do_syscall_64+0x26/0x610 [ 851.100463] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 851.106257] ? do_syscall_64+0x26/0x610 [ 851.110232] __x64_sys_sendmsg+0x78/0xb0 [ 851.114279] do_syscall_64+0x103/0x610 [ 851.118273] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 851.123562] RIP: 0033:0x4459f9 [ 851.126845] Code: ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 <7a> fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd [ 851.145833] RSP: 002b:00007ffdc979ac28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 851.153531] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004459f9 [ 851.160902] RDX: 00000000000000c4 RSI: 0000000020000300 RDI: 0000000000000003 [ 851.168272] RBP: 00000000000ac03d R08: 00000000004002c8 R09: 00000000004002c8 [ 851.175632] R10: 00000000200015a6 R11: 0000000000000246 R12: 0000000000406890 [ 851.182942] R13: 0000000000406920 R14: 0000000000000000 R15: 0000000000000000 [ 851.190306] INFO: task syz-executor725:8009 blocked for more than 140 seconds. [ 851.198034] Not tainted 5.0.0-rc6+ #75 [ 851.202429] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 851.210601] syz-executor725 D28008 8009 7595 0x00000004 [ 851.216379] Call Trace: [ 851.218982] __schedule+0x817/0x1cc0 [ 851.222688] ? __mutex_lock+0x721/0x1310 [ 851.226856] ? pci_mmcfg_check_reserved+0x170/0x170 [ 851.231871] schedule+0x92/0x180 [ 851.235714] schedule_preempt_disabled+0x13/0x20 [ 851.240470] __mutex_lock+0x726/0x1310 [ 851.244364] ? rtnetlink_rcv_msg+0x40a/0xb00 [ 851.248869] ? refcount_dec_and_test_checked+0x1b/0x20 [ 851.254243] ? mutex_trylock+0x1e0/0x1e0 [ 851.258572] ? rtnetlink_rcv_msg+0x3d0/0xb00 [ 851.262977] ? lock_downgrade+0x810/0x810 [ 851.267223] mutex_lock_nested+0x16/0x20 [ 851.271291] ? mutex_lock_nested+0x16/0x20 [ 851.275612] rtnetlink_rcv_msg+0x40a/0xb00 [ 851.279865] ? rtnetlink_put_metrics+0x560/0x560 [ 851.284640] ? netlink_deliver_tap+0x22d/0xbf0 [ 851.289427] ? find_held_lock+0x35/0x130 [ 851.293479] netlink_rcv_skb+0x17a/0x460 [ 851.297921] ? rtnetlink_put_metrics+0x560/0x560 [ 851.302782] ? netlink_ack+0xb50/0xb50 [ 851.306785] ? kasan_check_read+0x11/0x20 [ 851.310921] ? netlink_deliver_tap+0x254/0xbf0 [ 851.315612] rtnetlink_rcv+0x1d/0x30 [ 851.319381] netlink_unicast+0x536/0x720 [ 851.323432] ? netlink_attachskb+0x770/0x770 [ 851.327928] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 851.332936] ? __check_object_size+0x3d/0x42f [ 851.337494] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 851.342642] netlink_sendmsg+0x8ae/0xd70 [ 851.346810] ? netlink_unicast+0x720/0x720 [ 851.351028] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 851.356078] ? apparmor_socket_sendmsg+0x2a/0x30 [ 851.360823] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 851.366823] ? security_socket_sendmsg+0x93/0xc0 [ 851.371565] ? netlink_unicast+0x720/0x720 [ 851.375865] sock_sendmsg+0xdd/0x130 [ 851.379673] ___sys_sendmsg+0x806/0x930 [ 851.383627] ? copy_msghdr_from_user+0x430/0x430 [ 851.388502] ? __local_bh_enable_ip+0x15a/0x270 [ 851.393194] ? lockdep_hardirqs_on+0x415/0x5d0 [ 851.397866] ? release_sock+0x158/0x1c0 [ 851.401828] ? trace_hardirqs_on+0x67/0x230 [ 851.406501] ? release_sock+0x158/0x1c0 [ 851.410484] ? __local_bh_enable_ip+0x15a/0x270 [ 851.415246] ? _raw_spin_unlock_bh+0x31/0x40 [ 851.419645] ? release_sock+0x158/0x1c0 [ 851.423616] ? sock_setsockopt+0x197/0x2030 [ 851.428086] ? sock_enable_timestamp+0xe0/0xe0 [ 851.432656] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 851.437682] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 851.443352] ? __fget_light+0x1a9/0x230 [ 851.447490] ? __fdget+0x1b/0x20 [ 851.450847] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 851.456474] __sys_sendmsg+0x105/0x1d0 [ 851.460362] ? __ia32_sys_shutdown+0x80/0x80 [ 851.464877] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 851.469631] ? do_syscall_64+0x26/0x610 [ 851.473589] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 851.479055] ? do_syscall_64+0x26/0x610 [ 851.483015] __x64_sys_sendmsg+0x78/0xb0 [ 851.487159] do_syscall_64+0x103/0x610 [ 851.491034] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 851.496674] RIP: 0033:0x4459f9 [ 851.499855] Code: ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 <7a> fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd [ 851.518903] RSP: 002b:00007ffdc979ac28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 851.526718] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004459f9 [ 851.533990] RDX: 00000000000000c4 RSI: 0000000020000300 RDI: 0000000000000003 [ 851.541357] RBP: 00000000000ac03d R08: 00000000004002c8 R09: 00000000004002c8 [ 851.548695] R10: 00000000200015a6 R11: 0000000000000246 R12: 0000000000406890 [ 851.556061] R13: 0000000000406920 R14: 0000000000000000 R15: 0000000000000000 [ 851.563337] INFO: task syz-executor725:8010 blocked for more than 140 seconds. [ 851.570779] Not tainted 5.0.0-rc6+ #75 [ 851.575274] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 851.583223] syz-executor725 D28000 8010 7596 0x00000004 [ 851.588937] Call Trace: [ 851.591576] __schedule+0x817/0x1cc0 [ 851.595384] ? __mutex_lock+0x721/0x1310 [ 851.599442] ? pci_mmcfg_check_reserved+0x170/0x170 [ 851.604444] schedule+0x92/0x180 [ 851.607949] schedule_preempt_disabled+0x13/0x20 [ 851.612835] __mutex_lock+0x726/0x1310 [ 851.616939] ? rtnetlink_rcv_msg+0x40a/0xb00 [ 851.621345] ? mutex_trylock+0x1e0/0x1e0 [ 851.626008] ? rtnetlink_rcv_msg+0x3d0/0xb00 [ 851.630407] ? lock_downgrade+0x810/0x810 [ 851.634536] mutex_lock_nested+0x16/0x20 [ 851.638777] ? mutex_lock_nested+0x16/0x20 [ 851.643000] rtnetlink_rcv_msg+0x40a/0xb00 [ 851.647350] ? rtnetlink_put_metrics+0x560/0x560 [ 851.652096] ? netlink_deliver_tap+0x22d/0xbf0 [ 851.656757] ? find_held_lock+0x35/0x130 [ 851.660810] netlink_rcv_skb+0x17a/0x460 [ 851.664936] ? rtnetlink_put_metrics+0x560/0x560 [ 851.669678] ? netlink_ack+0xb50/0xb50 [ 851.673548] ? kasan_check_read+0x11/0x20 [ 851.677774] ? netlink_deliver_tap+0x254/0xbf0 [ 851.682345] rtnetlink_rcv+0x1d/0x30 [ 851.686133] netlink_unicast+0x536/0x720 [ 851.690205] ? netlink_attachskb+0x770/0x770 [ 851.694613] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 851.699780] ? __check_object_size+0x3d/0x42f [ 851.704259] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 851.709360] netlink_sendmsg+0x8ae/0xd70 [ 851.713412] ? netlink_unicast+0x720/0x720 [ 851.717724] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 851.722615] ? apparmor_socket_sendmsg+0x2a/0x30 [ 851.727556] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 851.733130] ? security_socket_sendmsg+0x93/0xc0 [ 851.737982] ? netlink_unicast+0x720/0x720 [ 851.742208] sock_sendmsg+0xdd/0x130 [ 851.745993] ___sys_sendmsg+0x806/0x930 [ 851.749966] ? copy_msghdr_from_user+0x430/0x430 [ 851.754703] ? __local_bh_enable_ip+0x15a/0x270 [ 851.760007] ? lockdep_hardirqs_on+0x415/0x5d0 [ 851.764583] ? release_sock+0x158/0x1c0 [ 851.768648] ? trace_hardirqs_on+0x67/0x230 [ 851.772970] ? release_sock+0x158/0x1c0 [ 851.777037] ? __local_bh_enable_ip+0x15a/0x270 [ 851.781697] ? _raw_spin_unlock_bh+0x31/0x40 [ 851.786208] ? release_sock+0x158/0x1c0 [ 851.790187] ? sock_setsockopt+0x197/0x2030 [ 851.794501] ? sock_enable_timestamp+0xe0/0xe0 [ 851.799580] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 851.804536] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 851.810242] ? __fget_light+0x1a9/0x230 [ 851.814229] ? __fdget+0x1b/0x20 [ 851.817750] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 851.823301] __sys_sendmsg+0x105/0x1d0 [ 851.827343] ? __ia32_sys_shutdown+0x80/0x80 [ 851.831768] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 851.836652] ? do_syscall_64+0x26/0x610 [ 851.840636] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 851.846133] ? do_syscall_64+0x26/0x610 [ 851.850121] __x64_sys_sendmsg+0x78/0xb0 [ 851.854188] do_syscall_64+0x103/0x610 [ 851.858246] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 851.863474] RIP: 0033:0x4459f9 [ 851.866834] Code: ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 <7a> fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd [ 851.886999] RSP: 002b:00007ffdc979ac28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 851.894723] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004459f9 [ 851.902176] RDX: 00000000000000c4 RSI: 0000000020000300 RDI: 0000000000000003 [ 851.909598] RBP: 00000000000ac03e R08: 00000000004002c8 R09: 00000000004002c8 [ 851.916989] R10: 00000000200015a6 R11: 0000000000000246 R12: 0000000000406890 [ 851.924255] R13: 0000000000406920 R14: 0000000000000000 R15: 0000000000000000 [ 851.931705] INFO: task syz-executor725:8011 blocked for more than 140 seconds. [ 851.939205] Not tainted 5.0.0-rc6+ #75 [ 851.943608] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 851.951700] syz-executor725 D28008 8011 7594 0x00000004 [ 851.957513] Call Trace: [ 851.960111] __schedule+0x817/0x1cc0 [ 851.963820] ? __mutex_lock+0x721/0x1310 [ 851.968032] ? pci_mmcfg_check_reserved+0x170/0x170 [ 851.973069] schedule+0x92/0x180 [ 851.976565] schedule_preempt_disabled+0x13/0x20 [ 851.981353] __mutex_lock+0x726/0x1310 [ 851.985380] ? rtnetlink_rcv_msg+0x40a/0xb00 [ 851.989806] ? mutex_trylock+0x1e0/0x1e0 [ 851.993862] ? rtnetlink_rcv_msg+0x3d0/0xb00 [ 851.998435] ? lock_downgrade+0x810/0x810 [ 852.002602] mutex_lock_nested+0x16/0x20 [ 852.006773] ? mutex_lock_nested+0x16/0x20 [ 852.011010] rtnetlink_rcv_msg+0x40a/0xb00 [ 852.016116] ? rtnetlink_put_metrics+0x560/0x560 [ 852.020897] ? netlink_deliver_tap+0x22d/0xbf0 [ 852.025615] ? find_held_lock+0x35/0x130 [ 852.029729] netlink_rcv_skb+0x17a/0x460 [ 852.033806] ? rtnetlink_put_metrics+0x560/0x560 [ 852.038689] ? netlink_ack+0xb50/0xb50 [ 852.042587] ? kasan_check_read+0x11/0x20 [ 852.046923] ? netlink_deliver_tap+0x254/0xbf0 [ 852.051531] rtnetlink_rcv+0x1d/0x30 [ 852.055473] netlink_unicast+0x536/0x720 [ 852.059566] ? netlink_attachskb+0x770/0x770 [ 852.063985] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 852.069177] ? __check_object_size+0x3d/0x42f [ 852.073693] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 852.078909] netlink_sendmsg+0x8ae/0xd70 [ 852.082990] ? netlink_unicast+0x720/0x720 [ 852.087386] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 852.092274] ? apparmor_socket_sendmsg+0x2a/0x30 [ 852.097219] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 852.102761] ? security_socket_sendmsg+0x93/0xc0 [ 852.107691] ? netlink_unicast+0x720/0x720 [ 852.111953] sock_sendmsg+0xdd/0x130 [ 852.115821] ___sys_sendmsg+0x806/0x930 [ 852.119802] ? copy_msghdr_from_user+0x430/0x430 [ 852.124559] ? __local_bh_enable_ip+0x15a/0x270 [ 852.129441] ? lockdep_hardirqs_on+0x415/0x5d0 [ 852.134042] ? release_sock+0x158/0x1c0 [ 852.138161] ? trace_hardirqs_on+0x67/0x230 [ 852.142502] ? release_sock+0x158/0x1c0 [ 852.147279] ? __local_bh_enable_ip+0x15a/0x270 [ 852.151964] ? _raw_spin_unlock_bh+0x31/0x40 [ 852.156494] ? release_sock+0x158/0x1c0 [ 852.160475] ? sock_setsockopt+0x197/0x2030 [ 852.164913] ? sock_enable_timestamp+0xe0/0xe0 [ 852.169511] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 852.174452] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 852.180107] ? __fget_light+0x1a9/0x230 [ 852.184093] ? __fdget+0x1b/0x20 [ 852.187608] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 852.193160] __sys_sendmsg+0x105/0x1d0 [ 852.197169] ? __ia32_sys_shutdown+0x80/0x80 [ 852.201603] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 852.207117] ? do_syscall_64+0x26/0x610 [ 852.211116] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 852.216598] ? do_syscall_64+0x26/0x610 [ 852.220583] __x64_sys_sendmsg+0x78/0xb0 [ 852.224677] do_syscall_64+0x103/0x610 [ 852.228706] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 852.233910] RIP: 0033:0x4459f9 [ 852.237219] Code: ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 <7a> fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd [ 852.256245] RSP: 002b:00007ffdc979ac28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 852.263964] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004459f9 [ 852.271371] RDX: 00000000000000c4 RSI: 0000000020000300 RDI: 0000000000000003 [ 852.279525] RBP: 00000000000ac03b R08: 00000000004002c8 R09: 00000000004002c8 [ 852.286936] R10: 00000000200015a6 R11: 0000000000000246 R12: 0000000000406890 [ 852.294225] R13: 0000000000406920 R14: 0000000000000000 R15: 0000000000000000 [ 852.301660] [ 852.301660] Showing all locks held in the system: [ 852.308102] 3 locks held by kworker/1:1/22: [ 852.312443] #0: 000000009b0b09b4 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x87e/0x1790 [ 852.322977] #1: 00000000e8391065 ((addr_chk_work).work){+.+.}, at: process_one_work+0x8b4/0x1790 [ 852.332124] #2: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 [ 852.339613] 1 lock held by khungtaskd/1040: [ 852.343942] #0: 00000000083344d4 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 852.352707] 1 lock held by rsyslogd/7472: [ 852.356976] #0: 000000007562dcc1 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 852.364995] 2 locks held by getty/7562: [ 852.368964] #0: 000000000837ceb2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 852.377322] #1: 00000000d91e6e17 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 852.386283] 2 locks held by getty/7563: [ 852.390249] #0: 00000000243db696 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 852.398607] #1: 000000000002034d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 852.408243] 2 locks held by getty/7564: [ 852.412218] #0: 00000000a59e483b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 852.420597] #1: 000000004032d53a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 852.429586] 2 locks held by getty/7565: [ 852.433556] #0: 0000000025343c97 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 852.441930] #1: 00000000727bf19a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 852.451022] 2 locks held by getty/7566: [ 852.455102] #0: 000000003dac20af (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 852.463354] #1: 00000000fef38c44 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 852.472379] 2 locks held by getty/7567: [ 852.476497] #0: 00000000da1bfc9c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 852.484742] #1: 00000000f82cf636 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 852.493743] 2 locks held by getty/7568: [ 852.497844] #0: 00000000a5d9fcdf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 852.506244] #1: 000000005ae165cb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 852.515269] 1 lock held by syz-executor725/8002: [ 852.520076] 1 lock held by syz-executor725/8005: [ 852.524975] #0: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40a/0xb00 [ 852.533183] 1 lock held by syz-executor725/8008: [ 852.538754] #0: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40a/0xb00 [ 852.547265] 1 lock held by syz-executor725/8009: [ 852.552019] #0: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40a/0xb00 [ 852.560305] 1 lock held by syz-executor725/8010: [ 852.565211] #0: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40a/0xb00 [ 852.573378] 1 lock held by syz-executor725/8011: [ 852.578282] #0: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40a/0xb00 [ 852.586581] [ 852.588209] ============================================= [ 852.588209] [ 852.595331] NMI backtrace for cpu 0 [ 852.598962] CPU: 0 PID: 1040 Comm: khungtaskd Not tainted 5.0.0-rc6+ #75 [ 852.605816] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 852.615181] Call Trace: [ 852.617767] dump_stack+0x172/0x1f0 [ 852.621397] nmi_cpu_backtrace.cold+0x63/0xa4 [ 852.625901] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 852.630835] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 852.636116] arch_trigger_cpumask_backtrace+0x14/0x20 [ 852.641302] watchdog+0x9df/0xee0 [ 852.644772] kthread+0x357/0x430 [ 852.648142] ? reset_hung_task_detector+0x30/0x30 [ 852.652977] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 852.658508] ret_from_fork+0x3a/0x50 [ 852.662309] Sending NMI from CPU 0 to CPUs 1: [ 852.668516] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.415 msecs [ 852.668927] NMI backtrace for cpu 1 [ 852.668934] CPU: 1 PID: 8002 Comm: syz-executor725 Not tainted 5.0.0-rc6+ #75 [ 852.668940] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 852.668945] RIP: 0010:unwind_next_frame.part.0+0x1a8/0x9a0 [ 852.668956] Code: 8b 6d 20 4c 89 ee 48 89 df 4c 89 95 60 ff ff ff 4c 89 9d 68 ff ff ff 4c 89 8d 70 ff ff ff e8 6f f7 ff ff 4c 8b 8d 70 ff ff ff <41> 89 c0 4c 8b 9d 68 ff ff ff b8 01 00 00 00 45 84 c0 4c 8b 95 60 [ 852.668961] RSP: 0018:ffff888096136e28 EFLAGS: 00000286 [ 852.668969] RAX: 0000000000000001 RBX: ffff888096136f00 RCX: 1ffff11012c26de8 [ 852.668974] RDX: dffffc0000000000 RSI: 1ffff11012c26d00 RDI: ffff888096136f48 [ 852.668980] RBP: ffff888096136ed8 R08: 0000000000000001 R09: ffff888096136f50 [ 852.668985] R10: ffff888096136f28 R11: ffff888096136f38 R12: 1ffff11012c26dca [ 852.668990] R13: ffff888096137b70 R14: ffff888096137b40 R15: ffff888096137f58 [ 852.668996] FS: 00000000024b2880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 852.669001] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 852.669018] CR2: ffffffffff600400 CR3: 000000009810b000 CR4: 00000000001406e0 [ 852.669020] Call Trace: [ 852.669024] ? unwind_dump+0x100/0x100 [ 852.669028] ? unwind_dump+0x100/0x100 [ 852.669031] unwind_next_frame+0x3b/0x50 [ 852.669035] __save_stack_trace+0x7a/0xf0 [ 852.669039] ? ___sys_sendmsg+0x806/0x930 [ 852.669043] save_stack_trace+0x1a/0x20 [ 852.669046] save_stack+0x45/0xd0 [ 852.669050] ? save_stack+0x45/0xd0 [ 852.669054] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 852.669058] ? kasan_kmalloc+0x9/0x10 [ 852.669062] ? __kmalloc_node_track_caller+0x4e/0x70 [ 852.669066] ? __kmalloc_reserve.isra.0+0x40/0xf0 [ 852.669070] ? pskb_expand_head+0x14e/0xdd0 [ 852.669074] ? netlink_trim+0x215/0x270 [ 852.669077] ? netlink_unicast+0xbf/0x720 [ 852.669081] ? rtnetlink_send+0xf0/0x110 [ 852.669085] ? tcf_action_add+0x243/0x370 [ 852.669088] ? tc_ctl_action+0x3b6/0x4bd [ 852.669092] ? rtnetlink_rcv_msg+0x465/0xb00 [ 852.669096] ? netlink_rcv_skb+0x17a/0x460 [ 852.669099] ? rtnetlink_rcv+0x1d/0x30 [ 852.669103] ? netlink_unicast+0x536/0x720 [ 852.669107] ? netlink_sendmsg+0x8ae/0xd70 [ 852.669110] ? sock_sendmsg+0xdd/0x130 [ 852.669115] ? kmem_cache_alloc_node_trace+0x5a3/0x720 [ 852.669118] ? find_held_lock+0x35/0x130 [ 852.669134] ? kmem_cache_alloc_node_trace+0x5a3/0x720 [ 852.669138] ? __lock_is_held+0xb6/0x140 [ 852.669142] ? check_preemption_disabled+0x48/0x290 [ 852.669146] ? __kmalloc_node_track_caller+0x3d/0x70 [ 852.669150] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 852.669155] ? rcu_read_lock_sched_held+0x110/0x130 [ 852.669159] ? kmem_cache_alloc_node_trace+0x352/0x720 [ 852.669162] ? lock_downgrade+0x810/0x810 [ 852.669166] ? kasan_unpoison_shadow+0x35/0x50 [ 852.669170] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 852.669173] kasan_kmalloc+0x9/0x10 [ 852.669177] __kmalloc_node_track_caller+0x4e/0x70 [ 852.669181] __kmalloc_reserve.isra.0+0x40/0xf0 [ 852.669185] pskb_expand_head+0x14e/0xdd0 [ 852.669188] ? kfree_skbmem+0xc5/0x150 [ 852.669192] ? rcu_read_lock_sched_held+0x110/0x130 [ 852.669196] ? kmem_cache_free+0x225/0x260 [ 852.669200] netlink_trim+0x215/0x270 [ 852.669203] netlink_unicast+0xbf/0x720 [ 852.669207] ? netlink_attachskb+0x770/0x770 [ 852.669210] ? netlink_broadcast+0x3a/0x50 [ 852.669214] rtnetlink_send+0xf0/0x110 [ 852.669218] tcf_action_add+0x243/0x370 [ 852.669221] ? tca_action_gd+0x17a0/0x17a0 [ 852.669225] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 852.669229] tc_ctl_action+0x3b6/0x4bd [ 852.669233] ? tcf_action_add+0x370/0x370 [ 852.669236] ? __lock_is_held+0xb6/0x140 [ 852.669241] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 852.669244] ? tcf_action_add+0x370/0x370 [ 852.669248] rtnetlink_rcv_msg+0x465/0xb00 [ 852.669252] ? rtnetlink_put_metrics+0x560/0x560 [ 852.669256] ? netlink_deliver_tap+0x22d/0xbf0 [ 852.669260] ? find_held_lock+0x35/0x130 [ 852.669263] netlink_rcv_skb+0x17a/0x460 [ 852.669267] ? rtnetlink_put_metrics+0x560/0x560 [ 852.669271] ? netlink_ack+0xb50/0xb50 [ 852.669274] ? kasan_check_read+0x11/0x20 [ 852.669278] ? netlink_deliver_tap+0x254/0xbf0 [ 852.669282] rtnetlink_rcv+0x1d/0x30 [ 852.669285] netlink_unicast+0x536/0x720 [ 852.669289] ? netlink_attachskb+0x770/0x770 [ 852.669293] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 852.669297] ? __check_object_size+0x3d/0x42f [ 852.669301] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 852.669305] netlink_sendmsg+0x8ae/0xd70 [ 852.669309] ? netlink_unicast+0x720/0x720 [ 852.669313] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 852.669317] ? apparmor_socket_sendmsg+0x2a/0x30 [ 852.669321] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 852.669325] ? security_socket_sendmsg+0x93/0xc0 [ 852.669329] ? netlink_unicast+0x720/0x720 [ 852.669332] sock_sendmsg+0xdd/0x130 [ 852.669336] ___sys_sendmsg+0x806/0x930 [ 852.669340] ? copy_msghdr_from_user+0x430/0x430 [ 852.669343] ? __local_bh_enable_ip+0x15a/0x270 [ 852.669347] ? lockdep_hardirqs_on+0x415/0x5d0 [ 852.669351] ? release_sock+0x158/0x1c0 [ 852.669354] ? trace_hardirqs_on+0x67/0x230 [ 852.669358] ? release_sock+0x158/0x1c0 [ 852.669362] ? __local_bh_enable_ip+0x15a/0x270 [ 852.669366] ? _raw_spin_unlock_bh+0x31/0x40 [ 852.669369] ? release_sock+0x158/0x1c0 [ 852.669373] ? sock_setsockopt+0x197/0x2030 [ 852.669377] ? sock_enable_timestamp+0xe0/0xe0 [ 852.669381] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 852.669385] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 852.669389] ? __fget_light+0x1a9/0x230 [ 852.669392] ? __fdget+0x1b/0x20 [ 852.669396] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 852.669400] __sys_sendmsg+0x105/0x1d0 [ 852.669404] ? __ia32_sys_shutdown+0x80/0x80 [ 852.669415] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 852.669418] ? do_syscall_64+0x26/0x610 [ 852.669423] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 852.669426] ? do_syscall_64+0x26/0x610 [ 852.669430] __x64_sys_sendmsg+0x78/0xb0 [ 852.669433] do_syscall_64+0x103/0x610 [ 852.669437] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 852.669440] RIP: 0033:0x4459f9 [ 852.669452] Code: e8 ac e8 ff ff 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 0b 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 852.669456] RSP: 002b:00007ffdc979ac28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 852.669465] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004459f9 [ 852.669470] RDX: 00000000000000c4 RSI: 0000000020000300 RDI: 0000000000000003 [ 852.669475] RBP: 00000000000ac031 R08: 00000000004002c8 R09: 00000000004002c8 [ 852.669481] R10: 00000000200015a6 R11: 0000000000000246 R12: 0000000000406890 [ 852.669486] R13: 0000000000406920 R14: 0000000000000000 R15: 0000000000000000 [ 852.671281] Kernel panic - not syncing: hung_task: blocked tasks [ 853.318226] CPU: 0 PID: 1040 Comm: khungtaskd Not tainted 5.0.0-rc6+ #75 [ 853.325077] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 853.334423] Call Trace: [ 853.337524] dump_stack+0x172/0x1f0 [ 853.341168] panic+0x2cb/0x65c [ 853.344471] ? __warn_printk+0xf3/0xf3 [ 853.348369] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 853.353330] ? ___preempt_schedule+0x16/0x18 [ 853.357739] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 853.363992] ? nmi_trigger_cpumask_backtrace+0x1fa/0x236 [ 853.369441] ? nmi_trigger_cpumask_backtrace+0x204/0x236 [ 853.374892] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 853.380342] watchdog+0x9f0/0xee0 [ 853.383806] kthread+0x357/0x430 [ 853.387180] ? reset_hung_task_detector+0x30/0x30 [ 853.392027] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 853.397602] ret_from_fork+0x3a/0x50 [ 853.402364] Kernel Offset: disabled [ 853.405993] Rebooting in 86400 seconds..