[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 67.412733][ T9710] sshd (9710) used greatest stack depth: 23248 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 67.704995][ T27] kauditd_printk_skb: 2 callbacks suppressed [ 67.705006][ T27] audit: type=1800 audit(1584517145.145:29): pid=9644 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 [ 67.731549][ T27] audit: type=1800 audit(1584517145.145:30): pid=9644 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 '10.128.0.185' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 76.078472][ T9797] IPVS: ftp: loaded support on port[0] = 21 [ 76.111611][ T9799] ------------[ cut here ]------------ [ 76.117151][ T9799] ODEBUG: activate active (active state 1) object type: rcu_head hint: 0x0 [ 76.126110][ T9799] WARNING: CPU: 1 PID: 9799 at lib/debugobjects.c:485 debug_print_object+0x160/0x250 [ 76.135559][ T9799] Kernel panic - not syncing: panic_on_warn set ... [ 76.142158][ T9799] CPU: 1 PID: 9799 Comm: syz-executor827 Not tainted 5.6.0-rc6-syzkaller #0 [ 76.150814][ T9799] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.160902][ T9799] Call Trace: [ 76.164183][ T9799] dump_stack+0x188/0x20d [ 76.168514][ T9799] ? debug_print_object+0x120/0x250 [ 76.173706][ T9799] panic+0x2e3/0x75c [ 76.177617][ T9799] ? add_taint.cold+0x16/0x16 [ 76.182291][ T9799] ? __probe_kernel_read+0x188/0x1d0 [ 76.187552][ T9799] ? __warn.cold+0x14/0x35 [ 76.191951][ T9799] ? __warn+0xd5/0x1c8 [ 76.196001][ T9799] ? debug_print_object+0x160/0x250 [ 76.201199][ T9799] __warn.cold+0x2f/0x35 [ 76.205429][ T9799] ? debug_print_object+0x160/0x250 [ 76.210608][ T9799] report_bug+0x27b/0x2f0 [ 76.214928][ T9799] do_error_trap+0x12b/0x220 [ 76.219526][ T9799] ? debug_print_object+0x160/0x250 [ 76.224710][ T9799] do_invalid_op+0x32/0x40 [ 76.229106][ T9799] ? debug_print_object+0x160/0x250 [ 76.234285][ T9799] invalid_op+0x23/0x30 [ 76.238429][ T9799] RIP: 0010:debug_print_object+0x160/0x250 [ 76.244227][ T9799] Code: dd c0 f3 51 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 00 00 00 48 8b 14 dd c0 f3 51 88 48 c7 c7 20 e9 51 88 e8 d8 cc b1 fd <0f> 0b 83 05 ab 9a d3 06 01 48 83 c4 20 5b 5d 41 5c 41 5d c3 48 89 [ 76.263869][ T9799] RSP: 0018:ffffc900020f7168 EFLAGS: 00010286 [ 76.269928][ T9799] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 76.277879][ T9799] RDX: 0000000000000000 RSI: ffffffff815c06c1 RDI: fffff5200041ee1f [ 76.285829][ T9799] RBP: 0000000000000001 R08: ffff88809932c600 R09: fffffbfff180e578 [ 76.293779][ T9799] R10: fffffbfff180e577 R11: ffffffff8c072bbf R12: ffffffff897acba0 [ 76.301729][ T9799] R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200041ee3a [ 76.309698][ T9799] ? vprintk_func+0x81/0x17e [ 76.314448][ T9799] ? debug_print_object+0x160/0x250 [ 76.319644][ T9799] ? lockdep_hardirqs_on+0x417/0x5d0 [ 76.324914][ T9799] debug_object_activate+0x346/0x470 [ 76.330185][ T9799] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 76.335978][ T9799] ? debug_object_init_on_stack+0x20/0x20 [ 76.341691][ T9799] ? find_held_lock+0x2d/0x110 [ 76.346452][ T9799] ? free_object+0x70/0x70 [ 76.350868][ T9799] ? lock_downgrade+0x7f0/0x7f0 [ 76.355716][ T9799] ? delayed_work_timer_fn+0x90/0x90 [ 76.361077][ T9799] call_rcu+0x2c/0x690 [ 76.365186][ T9799] queue_rcu_work+0x82/0xa0 [ 76.369707][ T9799] route4_change+0x19e8/0x2250 [ 76.374482][ T9799] ? route4_destroy+0x800/0x800 [ 76.379333][ T9799] ? wait_for_completion+0x3c0/0x3c0 [ 76.384617][ T9799] tc_new_tfilter+0xa59/0x20b0 [ 76.389377][ T9799] ? route4_destroy+0x800/0x800 [ 76.394231][ T9799] ? tc_del_tfilter+0x1430/0x1430 [ 76.399258][ T9799] ? __lock_acquire+0x80b/0x3ca0 [ 76.404187][ T9799] ? apparmor_capable+0x454/0x8a0 [ 76.409216][ T9799] ? rcu_read_lock_held+0x9c/0xb0 [ 76.414274][ T9799] ? tc_del_tfilter+0x1430/0x1430 [ 76.419295][ T9799] rtnetlink_rcv_msg+0x810/0xad0 [ 76.424226][ T9799] ? rtnl_bridge_getlink+0x880/0x880 [ 76.429504][ T9799] ? mark_held_locks+0xe0/0xe0 [ 76.434254][ T9799] ? netlink_deliver_tap+0x146/0xb50 [ 76.439543][ T9799] netlink_rcv_skb+0x15a/0x410 [ 76.444308][ T9799] ? rtnl_bridge_getlink+0x880/0x880 [ 76.449589][ T9799] ? netlink_ack+0xa80/0xa80 [ 76.454206][ T9799] netlink_unicast+0x537/0x740 [ 76.458979][ T9799] ? netlink_attachskb+0x810/0x810 [ 76.464075][ T9799] ? _copy_from_iter_full+0x25c/0x870 [ 76.469433][ T9799] ? __phys_addr_symbol+0x2c/0x70 [ 76.474475][ T9799] ? __check_object_size+0x171/0x437 [ 76.479801][ T9799] netlink_sendmsg+0x882/0xe10 [ 76.484559][ T9799] ? aa_af_perm+0x260/0x260 [ 76.489054][ T9799] ? netlink_unicast+0x740/0x740 [ 76.493983][ T9799] ? netlink_unicast+0x740/0x740 [ 76.498930][ T9799] sock_sendmsg+0xcf/0x120 [ 76.503378][ T9799] ____sys_sendmsg+0x6b9/0x7d0 [ 76.508160][ T9799] ? kernel_sendmsg+0x50/0x50 [ 76.512841][ T9799] ___sys_sendmsg+0x100/0x170 [ 76.517528][ T9799] ? sendmsg_copy_msghdr+0x70/0x70 [ 76.522635][ T9799] ? __fget_files+0x329/0x4f0 [ 76.527337][ T9799] ? ksys_dup3+0x3c0/0x3c0 [ 76.531804][ T9799] ? __fget_light+0x208/0x270 [ 76.536473][ T9799] __sys_sendmsg+0xec/0x1b0 [ 76.540978][ T9799] ? __sys_sendmsg_sock+0xb0/0xb0 [ 76.546009][ T9799] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 76.551977][ T9799] ? __ia32_sys_futex_time32+0x32a/0x494 [ 76.557605][ T9799] ? trace_hardirqs_off_caller+0x55/0x230 [ 76.563328][ T9799] ? do_fast_syscall_32+0xcc/0xe8f [ 76.568538][ T9799] do_fast_syscall_32+0x270/0xe8f [ 76.573567][ T9799] entry_SYSENTER_compat+0x70/0x7f [ 76.580290][ T9799] Kernel Offset: disabled [ 76.584687][ T9799] Rebooting in 86400 seconds..