[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 55.430336][ T27] audit: type=1800 audit(1583523439.605:25): pid=8665 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 55.471120][ T27] audit: type=1800 audit(1583523439.605:26): pid=8665 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 55.497274][ T27] audit: type=1800 audit(1583523439.605:27): pid=8665 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 '10.128.10.6' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 84.242383][ T8818] IPVS: ftp: loaded support on port[0] = 21 [ 84.271823][ T8819] ------------[ cut here ]------------ [ 84.277385][ T8819] ODEBUG: activate active (active state 1) object type: rcu_head hint: 0x0 [ 84.286448][ T8819] WARNING: CPU: 1 PID: 8819 at lib/debugobjects.c:488 debug_object_activate+0x5a8/0x6f0 [ 84.297291][ T8819] Kernel panic - not syncing: panic_on_warn set ... [ 84.303866][ T8819] CPU: 1 PID: 8819 Comm: syz-executor606 Not tainted 5.6.0-rc3-syzkaller #0 [ 84.312563][ T8819] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 84.322601][ T8819] Call Trace: [ 84.325881][ T8819] dump_stack+0x1fb/0x318 [ 84.330197][ T8819] panic+0x264/0x7a9 [ 84.334079][ T8819] ? __warn+0x105/0x210 [ 84.338251][ T8819] ? debug_object_activate+0x5a8/0x6f0 [ 84.343719][ T8819] __warn+0x209/0x210 [ 84.347711][ T8819] ? debug_object_activate+0x5a8/0x6f0 [ 84.353158][ T8819] report_bug+0x1b6/0x2f0 [ 84.357469][ T8819] ? debug_object_activate+0x5a8/0x6f0 [ 84.362912][ T8819] do_error_trap+0xcf/0x1c0 [ 84.367398][ T8819] do_invalid_op+0x36/0x40 [ 84.371793][ T8819] ? debug_object_activate+0x5a8/0x6f0 [ 84.377241][ T8819] invalid_op+0x23/0x30 [ 84.381387][ T8819] RIP: 0010:debug_object_activate+0x5a8/0x6f0 [ 84.387475][ T8819] 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 [ 84.409084][ T8819] RSP: 0018:ffffc90001e573a8 EFLAGS: 00010246 [ 84.415128][ T8819] RAX: 03211476d81c3c00 RBX: 0000000000000001 RCX: ffff88809db5e2c0 [ 84.423075][ T8819] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 84.431021][ T8819] RBP: ffffc90001e573f0 R08: ffffffff81601324 R09: ffffed1015d66618 [ 84.438973][ T8819] R10: ffffed1015d66618 R11: 0000000000000000 R12: 0000000000000000 [ 84.446938][ T8819] R13: ffffffff88f4c97a R14: ffffffff892d99a8 R15: ffff8880a8875698 [ 84.454904][ T8819] ? vprintk_emit+0x2d4/0x3a0 [ 84.459603][ T8819] ? debug_object_activate+0x5a8/0x6f0 [ 84.465059][ T8819] ? queue_rcu_work+0x90/0x90 [ 84.469717][ T8819] call_rcu+0x3a/0x660 [ 84.473786][ T8819] queue_rcu_work+0x79/0x90 [ 84.478278][ T8819] ? route4_dump+0x6d0/0x6d0 [ 84.482861][ T8819] tcf_queue_work+0xc9/0xe0 [ 84.487342][ T8819] route4_change+0x18e8/0x1d90 [ 84.492117][ T8819] tc_new_tfilter+0x1490/0x2f50 [ 84.497306][ T8819] ? route4_get+0x390/0x390 [ 84.501828][ T8819] ? tcf_tunnel_encap_put_tunnel+0x20/0x20 [ 84.507620][ T8819] rtnetlink_rcv_msg+0x8fb/0xd40 [ 84.512574][ T8819] ? rcu_lock_release+0x9/0x30 [ 84.517321][ T8819] netlink_rcv_skb+0x19e/0x3e0 [ 84.522070][ T8819] ? rtnetlink_bind+0x80/0x80 [ 84.526728][ T8819] rtnetlink_rcv+0x1c/0x20 [ 84.531120][ T8819] netlink_unicast+0x766/0x920 [ 84.535883][ T8819] netlink_sendmsg+0xa2b/0xd40 [ 84.540649][ T8819] ? netlink_getsockopt+0x9f0/0x9f0 [ 84.545851][ T8819] ____sys_sendmsg+0x4f7/0x7f0 [ 84.550600][ T8819] __sys_sendmsg+0x1ed/0x290 [ 84.555185][ T8819] ? rcu_read_lock_sched_held+0x10b/0x170 [ 84.560995][ T8819] ? __kasan_check_write+0x14/0x20 [ 84.566127][ T8819] ? __fpregs_load_activate+0x194/0x220 [ 84.571689][ T8819] ? switch_fpu_return+0xe/0x10 [ 84.576542][ T8819] ? prepare_exit_to_usermode+0x221/0x5b0 [ 84.582258][ T8819] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 84.587976][ T8819] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 84.593640][ T8819] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 84.600507][ T8819] ? do_syscall_64+0x1d/0x1c0 [ 84.605173][ T8819] __x64_sys_sendmsg+0x7f/0x90 [ 84.609990][ T8819] do_syscall_64+0xf7/0x1c0 [ 84.614505][ T8819] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 84.620474][ T8819] RIP: 0033:0x446709 [ 84.624356][ T8819] 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 [ 84.644985][ T8819] RSP: 002b:00007ff6b2d5cd98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 84.653402][ T8819] RAX: ffffffffffffffda RBX: 00000000006dbc68 RCX: 0000000000446709 [ 84.661362][ T8819] RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000003 [ 84.669320][ T8819] RBP: 00000000006dbc60 R08: 0000000000000000 R09: 0000000000000000 [ 84.677282][ T8819] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc6c [ 84.686204][ T8819] R13: 0000000000000005 R14: 00a3a20740000000 R15: 0507002400000038 [ 84.696451][ T8819] Kernel Offset: disabled [ 84.700856][ T8819] Rebooting in 86400 seconds..