[ 64.370695][ T26] audit: type=1800 audit(1561526047.059:26): pid=9062 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 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. [ 65.474272][ T26] kauditd_printk_skb: 2 callbacks suppressed [ 65.474284][ T26] audit: type=1800 audit(1561526048.199:29): pid=9062 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 [ 65.506959][ T26] audit: type=1800 audit(1561526048.199:30): pid=9062 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 '10.128.15.225' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 76.112814][ T9216] [ 76.115232][ T9216] ============================= [ 76.120077][ T9216] WARNING: suspicious RCU usage [ 76.131192][ T9216] 5.2.0-rc6-next-20190625 #22 Not tainted [ 76.136909][ T9216] ----------------------------- [ 76.141833][ T9216] net/ipv4/route.c:2875 suspicious rcu_dereference_check() usage! [ 76.149855][ T9216] [ 76.149855][ T9216] other info that might help us debug this: [ 76.149855][ T9216] [ 76.161118][ T9216] [ 76.161118][ T9216] rcu_scheduler_active = 2, debug_locks = 1 [ 76.169183][ T9216] 1 lock held by syz-executor798/9216: [ 76.175107][ T9216] #0: 00000000e3c34427 (rtnl_mutex){+.+.}, at: netlink_dump+0xe7/0xfb0 [ 76.183518][ T9216] [ 76.183518][ T9216] stack backtrace: [ 76.189441][ T9216] CPU: 1 PID: 9216 Comm: syz-executor798 Not tainted 5.2.0-rc6-next-20190625 #22 [ 76.198545][ T9216] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.208597][ T9216] Call Trace: [ 76.211890][ T9216] dump_stack+0x172/0x1f0 [ 76.216209][ T9216] lockdep_rcu_suspicious+0x153/0x15d [ 76.221567][ T9216] fib_dump_info_fnhe+0x9d9/0x1080 [ 76.226672][ T9216] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 76.232908][ T9216] fib_table_dump+0x64a/0xd00 [ 76.237586][ T9216] ? fib_free_table+0x20/0x20 [ 76.242264][ T9216] ? __kmalloc_node_track_caller+0x3d/0x70 [ 76.248062][ T9216] ? rcu_read_lock_sched_held+0x110/0x130 [ 76.253770][ T9216] inet_dump_fib+0x83c/0xa90 [ 76.258358][ T9216] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 76.264152][ T9216] ? inet_addr_type_dev_table+0x1b0/0x1b0 [ 76.269859][ T9216] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 76.276093][ T9216] ? inet_addr_type_dev_table+0x1b0/0x1b0 [ 76.281821][ T9216] rtnl_dump_all+0x295/0x490 [ 76.286432][ T9216] netlink_dump+0x558/0xfb0 [ 76.291058][ T9216] ? netlink_broadcast+0x50/0x50 [ 76.295991][ T9216] __netlink_dump_start+0x5b1/0x7d0 [ 76.301277][ T9216] rtnetlink_rcv_msg+0x73d/0xb00 [ 76.306198][ T9216] ? rtnl_bridge_dellink+0x6c0/0x6c0 [ 76.311466][ T9216] ? rtnetlink_put_metrics+0x560/0x560 [ 76.316923][ T9216] ? lock_downgrade+0x920/0x920 [ 76.321768][ T9216] ? rtnl_bridge_dellink+0x6c0/0x6c0 [ 76.327041][ T9216] ? find_held_lock+0x35/0x130 [ 76.331795][ T9216] netlink_rcv_skb+0x177/0x450 [ 76.336547][ T9216] ? rtnetlink_put_metrics+0x560/0x560 [ 76.342000][ T9216] ? netlink_ack+0xb50/0xb50 [ 76.346586][ T9216] ? kasan_check_read+0x11/0x20 [ 76.351459][ T9216] ? netlink_deliver_tap+0x254/0xbf0 [ 76.356734][ T9216] rtnetlink_rcv+0x1d/0x30 [ 76.361148][ T9216] netlink_unicast+0x531/0x710 [ 76.365907][ T9216] ? netlink_attachskb+0x7c0/0x7c0 [ 76.371016][ T9216] ? _copy_from_iter_full+0x25d/0x8c0 [ 76.376388][ T9216] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 76.382559][ T9216] ? __check_object_size+0x3d/0x43c [ 76.387782][ T9216] netlink_sendmsg+0x8a5/0xd60 [ 76.392714][ T9216] ? netlink_unicast+0x710/0x710 [ 76.397755][ T9216] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 76.403301][ T9216] ? apparmor_socket_sendmsg+0x2a/0x30 [ 76.408933][ T9216] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 76.415170][ T9216] ? security_socket_sendmsg+0x8d/0xc0 [ 76.423101][ T9216] ? netlink_unicast+0x710/0x710 [ 76.428056][ T9216] sock_sendmsg+0xd7/0x130 [ 76.432472][ T9216] sock_write_iter+0x27c/0x3e0 [ 76.437230][ T9216] ? sock_sendmsg+0x130/0x130 [ 76.441917][ T9216] ? aa_path_link+0x340/0x340 [ 76.446585][ T9216] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 76.452969][ T9216] ? iov_iter_init+0xee/0x220 [ 76.457662][ T9216] new_sync_write+0x4d3/0x770 [ 76.462333][ T9216] ? new_sync_read+0x800/0x800 [ 76.467297][ T9216] ? common_file_perm+0x238/0x720 [ 76.472323][ T9216] ? lock_downgrade+0x920/0x920 [ 76.477166][ T9216] ? apparmor_file_permission+0x25/0x30 [ 76.482705][ T9216] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 76.488959][ T9216] ? security_file_permission+0x8f/0x380 [ 76.494600][ T9216] __vfs_write+0xe1/0x110 [ 76.498939][ T9216] vfs_write+0x268/0x5d0 [ 76.503185][ T9216] ksys_write+0x14f/0x290 [ 76.507526][ T9216] ? __ia32_sys_read+0xb0/0xb0 [ 76.512288][ T9216] ? do_syscall_64+0x26/0x6a0 [ 76.516982][ T9216] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 76.523062][ T9216] ? do_syscall_64+0x26/0x6a0 [ 76.527738][ T9216] __x64_sys_write+0x73/0xb0 [ 76.532339][ T9216] do_syscall_64+0xfd/0x6a0 [ 76.536854][ T9216] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 76.543493][ T9216] RIP: 0033:0x4401b9 [ 76.547475][ T9216] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 76.567259][ T9216] RSP: 002b:00007fff851e0e08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 76.575788][ T9216] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401b9 [ 76.583894][ T9216] RDX: 000000000000001c RSI: 0000000020000000 RDI: 0000000000000003 [ 76.591979][ T9216] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 76.599954][ T9216] R10: 0000000000000010 R11: 0000000000000246 R12: 0000000000401a40 [ 76.607928][ T9216] R13: 0000000000401ad0 R14: 0000000000000000 R15: 0000000000000000 [ 76.619108][ T9216] [ 76.621655][ T9216] ============================= [ 76.626514][ T9216] WARNING: suspicious RCU usage [ 76.631424][ T9216] 5.2.0-rc6-next-20190625 #22 Not tainted [ 76.637164][ T9216] ----------------------------- [ 76.642376][ T9216] net/ipv6/route.c:1593 suspicious rcu_dereference_check() usage! [ 76.650186][ T9216] [ 76.650186][ T9216] other info that might help us debug this: [ 76.650186][ T9216] [ 76.660693][ T9216] [ 76.660693][ T9216] rcu_scheduler_active = 2, debug_locks = 1 [ 76.668779][ T9216] 2 locks held by syz-executor798/9216: [ 76.674379][ T9216] #0: 00000000e3c34427 (rtnl_mutex){+.+.}, at: netlink_dump+0xe7/0xfb0 [ 76.682880][ T9216] #1: 000000008c4c8069 (&(&tb->tb6_lock)->rlock){+...}, at: fib6_dump_table.isra.0+0x37e/0x570 [ 76.693636][ T9216] [ 76.693636][ T9216] stack backtrace: [ 76.699670][ T9216] CPU: 1 PID: 9216 Comm: syz-executor798 Not tainted 5.2.0-rc6-next-20190625 #22 [ 76.708766][ T9216] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.718809][ T9216] Call Trace: [ 76.722094][ T9216] dump_stack+0x172/0x1f0 [ 76.726501][ T9216] lockdep_rcu_suspicious+0x153/0x15d [ 76.731881][ T9216] fib6_nh_get_excptn_bucket+0x18e/0x1b0 [ 76.737508][ T9216] rt6_nh_dump_exceptions+0x45/0x4d0 [ 76.742807][ T9216] ? kasan_check_read+0x11/0x20 [ 76.747669][ T9216] ? __lock_acquire+0x293b/0x4680 [ 76.752713][ T9216] rt6_dump_route+0x904/0xc50 [ 76.757400][ T9216] ? rt6_mtu_change+0x100/0x100 [ 76.762254][ T9216] ? mark_held_locks+0xa4/0xf0 [ 76.767006][ T9216] ? __local_bh_enable_ip+0x15a/0x270 [ 76.772388][ T9216] fib6_dump_node+0x168/0x280 [ 76.777075][ T9216] ? trace_hardirqs_on+0x67/0x240 [ 76.782116][ T9216] fib6_walk_continue+0x4a9/0x8e0 [ 76.787140][ T9216] fib6_walk+0x9d/0x100 [ 76.791291][ T9216] fib6_dump_table.isra.0+0x38a/0x570 [ 76.796659][ T9216] inet6_dump_fib+0x93c/0xb00 [ 76.801332][ T9216] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 76.807137][ T9216] ? fib6_net_init+0x720/0x720 [ 76.811900][ T9216] ? fib6_net_init+0x720/0x720 [ 76.816650][ T9216] rtnl_dump_all+0x295/0x490 [ 76.821233][ T9216] netlink_dump+0x558/0xfb0 [ 76.825724][ T9216] ? netlink_broadcast+0x50/0x50 [ 76.830661][ T9216] __netlink_dump_start+0x5b1/0x7d0 [ 76.835847][ T9216] rtnetlink_rcv_msg+0x73d/0xb00 [ 76.840767][ T9216] ? rtnl_bridge_dellink+0x6c0/0x6c0 [ 76.846038][ T9216] ? rtnetlink_put_metrics+0x560/0x560 [ 76.851487][ T9216] ? lock_downgrade+0x920/0x920 [ 76.856352][ T9216] ? rtnl_bridge_dellink+0x6c0/0x6c0 [ 76.861627][ T9216] ? find_held_lock+0x35/0x130 [ 76.866384][ T9216] netlink_rcv_skb+0x177/0x450 [ 76.871163][ T9216] ? rtnetlink_put_metrics+0x560/0x560 [ 76.876619][ T9216] ? netlink_ack+0xb50/0xb50 [ 76.881220][ T9216] ? kasan_check_read+0x11/0x20 [ 76.886061][ T9216] ? netlink_deliver_tap+0x254/0xbf0 [ 76.891361][ T9216] rtnetlink_rcv+0x1d/0x30 [ 76.895764][ T9216] netlink_unicast+0x531/0x710 [ 76.900618][ T9216] ? netlink_attachskb+0x7c0/0x7c0 [ 76.905716][ T9216] ? _copy_from_iter_full+0x25d/0x8c0 [ 76.911073][ T9216] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 76.916774][ T9216] ? __check_object_size+0x3d/0x43c [ 76.921966][ T9216] netlink_sendmsg+0x8a5/0xd60 [ 76.926725][ T9216] ? netlink_unicast+0x710/0x710 [ 76.931647][ T9216] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 76.937201][ T9216] ? apparmor_socket_sendmsg+0x2a/0x30 [ 76.942647][ T9216] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 76.948906][ T9216] ? security_socket_sendmsg+0x8d/0xc0 [ 76.954351][ T9216] ? netlink_unicast+0x710/0x710 [ 76.959362][ T9216] sock_sendmsg+0xd7/0x130 [ 76.963765][ T9216] sock_write_iter+0x27c/0x3e0 [ 76.968642][ T9216] ? sock_sendmsg+0x130/0x130 [ 76.973310][ T9216] ? aa_path_link+0x340/0x340 [ 76.981834][ T9216] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 76.988796][ T9216] ? iov_iter_init+0xee/0x220 [ 76.993462][ T9216] new_sync_write+0x4d3/0x770 [ 76.998124][ T9216] ? new_sync_read+0x800/0x800 [ 77.002896][ T9216] ? common_file_perm+0x238/0x720 [ 77.007911][ T9216] ? lock_downgrade+0x920/0x920 [ 77.012750][ T9216] ? apparmor_file_permission+0x25/0x30 [ 77.018280][ T9216] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 77.024507][ T9216] ? security_file_permission+0x8f/0x380 [ 77.030133][ T9216] __vfs_write+0xe1/0x110 [ 77.034450][ T9216] vfs_write+0x268/0x5d0 [ 77.038680][ T9216] ksys_write+0x14f/0x290 [ 77.043000][ T9216] ? __ia32_sys_read+0xb0/0xb0 [ 77.047752][ T9216] ? do_syscall_64+0x26/0x6a0 [ 77.052423][ T9216] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 77.058496][ T9216] ? do_syscall_64+0x26/0x6a0 [ 77.063177][ T9216] __x64_sys_write+0x73/0xb0 [ 77.067769][ T9216] do_syscall_64+0xfd/0x6a0 [ 77.072261][ T9216] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 77.078142][ T9216] RIP: 0033:0x4401b9 [ 77.082020][ T9216] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 77.101624][ T9216] RSP: 002b:00007fff851e0e08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 77.110028][ T9216] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401b9 [