[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 57.662365][ T23] audit: type=1800 audit(1583525728.748:25): pid=8825 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 57.681706][ T23] audit: type=1800 audit(1583525728.758:26): pid=8825 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 57.701783][ T23] audit: type=1800 audit(1583525728.758:27): pid=8825 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.42' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 88.773790][ T8978] IPVS: ftp: loaded support on port[0] = 21 [ 88.804229][ T8979] ------------[ cut here ]------------ [ 88.810155][ T8979] ODEBUG: activate active (active state 1) object type: rcu_head hint: 0x0 [ 88.819228][ T8979] WARNING: CPU: 1 PID: 8979 at lib/debugobjects.c:488 debug_object_activate+0x5a8/0x6f0 [ 88.829043][ T8979] Kernel panic - not syncing: panic_on_warn set ... [ 88.836006][ T8979] CPU: 1 PID: 8979 Comm: syz-executor219 Not tainted 5.6.0-rc3-syzkaller #0 [ 88.844751][ T8979] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 88.854824][ T8979] Call Trace: [ 88.858108][ T8979] dump_stack+0x1fb/0x318 [ 88.862434][ T8979] panic+0x264/0x7a9 [ 88.866319][ T8979] ? __warn+0x105/0x210 [ 88.870471][ T8979] ? debug_object_activate+0x5a8/0x6f0 [ 88.876065][ T8979] __warn+0x209/0x210 [ 88.880063][ T8979] ? debug_object_activate+0x5a8/0x6f0 [ 88.885529][ T8979] report_bug+0x1b6/0x2f0 [ 88.889871][ T8979] ? debug_object_activate+0x5a8/0x6f0 [ 88.895389][ T8979] do_error_trap+0xcf/0x1c0 [ 88.899919][ T8979] do_invalid_op+0x36/0x40 [ 88.904324][ T8979] ? debug_object_activate+0x5a8/0x6f0 [ 88.909779][ T8979] invalid_op+0x23/0x30 [ 88.913953][ T8979] RIP: 0010:debug_object_activate+0x5a8/0x6f0 [ 88.920022][ T8979] Code: 74 08 4c 89 f7 e8 d8 43 0f fe 4d 8b 06 48 c7 c7 13 ec f0 88 48 c7 c6 04 4f 06 89 4c 89 ea 89 d9 4d 89 e1 31 c0 e8 08 e0 a3 fd <0f> 0b 48 ba 00 00 00 00 00 fc ff df ff 05 da eb c4 05 48 8b 5d b8 [ 88.939662][ T8979] RSP: 0018:ffffc900020f73a8 EFLAGS: 00010246 [ 88.945733][ T8979] RAX: eb30c415fdb00600 RBX: 0000000000000001 RCX: ffff888095774280 [ 88.953731][ T8979] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 88.961727][ T8979] RBP: ffffc900020f73f0 R08: ffffffff81601324 R09: ffffed1015d66618 [ 88.969694][ T8979] R10: ffffed1015d66618 R11: 0000000000000000 R12: 0000000000000000 [ 88.977671][ T8979] R13: ffffffff88f4c97a R14: ffffffff892d99a8 R15: ffff88809f5ecc98 [ 88.985655][ T8979] ? vprintk_emit+0x2d4/0x3a0 [ 88.990359][ T8979] ? debug_object_activate+0x5a8/0x6f0 [ 88.995960][ T8979] ? queue_rcu_work+0x90/0x90 [ 89.000630][ T8979] call_rcu+0x3a/0x660 [ 89.004717][ T8979] queue_rcu_work+0x79/0x90 [ 89.009306][ T8979] ? route4_dump+0x6d0/0x6d0 [ 89.014763][ T8979] tcf_queue_work+0xc9/0xe0 [ 89.019274][ T8979] route4_change+0x18e8/0x1d90 [ 89.024061][ T8979] tc_new_tfilter+0x1490/0x2f50 [ 89.028908][ T8979] ? route4_get+0x390/0x390 [ 89.033459][ T8979] ? tcf_tunnel_encap_put_tunnel+0x20/0x20 [ 89.039256][ T8979] rtnetlink_rcv_msg+0x8fb/0xd40 [ 89.044213][ T8979] ? rcu_lock_release+0x9/0x30 [ 89.049026][ T8979] netlink_rcv_skb+0x19e/0x3e0 [ 89.053780][ T8979] ? rtnetlink_bind+0x80/0x80 [ 89.058450][ T8979] rtnetlink_rcv+0x1c/0x20 [ 89.062854][ T8979] netlink_unicast+0x766/0x920 [ 89.067611][ T8979] netlink_sendmsg+0xa2b/0xd40 [ 89.072374][ T8979] ? netlink_getsockopt+0x9f0/0x9f0 [ 89.077568][ T8979] ____sys_sendmsg+0x4f7/0x7f0 [ 89.082341][ T8979] __sys_sendmsg+0x1ed/0x290 [ 89.086952][ T8979] ? rcu_read_lock_sched_held+0x10b/0x170 [ 89.092682][ T8979] ? __kasan_check_write+0x14/0x20 [ 89.097795][ T8979] ? __fpregs_load_activate+0x194/0x220 [ 89.103330][ T8979] ? switch_fpu_return+0xe/0x10 [ 89.108169][ T8979] ? prepare_exit_to_usermode+0x221/0x5b0 [ 89.113891][ T8979] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 89.119608][ T8979] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 89.125752][ T8979] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 89.131475][ T8979] ? do_syscall_64+0x1d/0x1c0 [ 89.136165][ T8979] __x64_sys_sendmsg+0x7f/0x90 [ 89.140935][ T8979] do_syscall_64+0xf7/0x1c0 [ 89.145463][ T8979] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 89.151371][ T8979] RIP: 0033:0x446709 [ 89.155260][ T8979] Code: e8 1c ba 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 ab 0e fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 89.174977][ T8979] RSP: 002b:00007f823766ed98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 89.183391][ T8979] RAX: ffffffffffffffda RBX: 00000000006dbc68 RCX: 0000000000446709 [ 89.191715][ T8979] RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000003 [ 89.199694][ T8979] RBP: 00000000006dbc60 R08: 0000000000000000 R09: 0000000000000000 [ 89.207654][ T8979] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc6c [ 89.215625][ T8979] R13: 0000000000000005 R14: 00a3a20740000000 R15: 0507002400000038 [ 89.224921][ T8979] Kernel Offset: disabled [ 89.229315][ T8979] Rebooting in 86400 seconds..