[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 58.306447][ T27] kauditd_printk_skb: 7 callbacks suppressed [ 58.306454][ T27] audit: type=1800 audit(1565901044.441:29): pid=9454 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 58.339943][ T27] audit: type=1800 audit(1565901044.441:30): pid=9454 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.10.47' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 72.826329][ T9608] ------------[ cut here ]------------ [ 72.831956][ T9608] ODEBUG: free active (active state 0) object type: timer_list hint: rfcomm_dlc_timeout+0x0/0x80 [ 72.845199][ T9608] WARNING: CPU: 0 PID: 9608 at lib/debugobjects.c:484 debug_check_no_obj_freed+0x464/0x5b0 [ 72.860479][ T9608] Kernel panic - not syncing: panic_on_warn set ... [ 72.867797][ T9608] CPU: 0 PID: 9608 Comm: syz-executor245 Not tainted 5.3.0-rc4+ #77 [ 72.876232][ T9608] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.886491][ T9608] Call Trace: [ 72.890082][ T9608] dump_stack+0x1d8/0x2f8 [ 72.894531][ T9608] panic+0x25c/0x799 [ 72.898609][ T9608] ? __warn+0x126/0x230 [ 72.903031][ T9608] __warn+0x22f/0x230 [ 72.907329][ T9608] ? debug_check_no_obj_freed+0x464/0x5b0 [ 72.913075][ T9608] report_bug+0x190/0x290 [ 72.917394][ T9608] ? debug_check_no_obj_freed+0x464/0x5b0 [ 72.923322][ T9608] do_error_trap+0xd7/0x440 [ 72.927931][ T9608] do_invalid_op+0x36/0x40 [ 72.932694][ T9608] ? debug_check_no_obj_freed+0x464/0x5b0 [ 72.939761][ T9608] invalid_op+0x23/0x30 [ 72.944011][ T9608] RIP: 0010:debug_check_no_obj_freed+0x464/0x5b0 [ 72.950440][ T9608] Code: 08 48 89 df e8 fd b8 58 fe 4c 8b 03 48 c7 c7 7d 54 45 88 48 c7 c6 c4 76 43 88 4c 89 e2 44 89 f9 4d 89 e9 31 c0 e8 bc ab f2 fd <0f> 0b 4c 8b 6d a8 ff 05 14 66 6a 05 49 83 c5 30 4c 89 e8 48 c1 e8 [ 72.973394][ T9608] RSP: 0018:ffff888094b3fb78 EFLAGS: 00010046 [ 72.979683][ T9608] RAX: fe29a7abb0e63900 RBX: ffffffff888da040 RCX: ffff888089d38200 [ 72.988066][ T9608] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 72.996307][ T9608] RBP: ffff888094b3fc10 R08: ffffffff815cf524 R09: ffffed1015d440d2 [ 73.005713][ T9608] R10: ffffed1015d440d2 R11: 0000000000000000 R12: ffffffff884ee35a [ 73.015477][ T9608] R13: ffffffff86c3b580 R14: dffffc0000000000 R15: 0000000000000000 [ 73.024351][ T9608] ? rfcomm_dlc_alloc+0x3a0/0x3a0 [ 73.029588][ T9608] ? vprintk_emit+0x2d4/0x3a0 [ 73.034357][ T9608] ? debug_check_no_obj_freed+0x464/0x5b0 [ 73.040475][ T9608] ? rfcomm_dlc_free+0x1e/0x30 [ 73.045233][ T9608] kfree+0x107/0x200 [ 73.049552][ T9608] rfcomm_dlc_free+0x1e/0x30 [ 73.054229][ T9608] rfcomm_dev_ioctl+0xb9a/0x1c70 [ 73.059241][ T9608] ? __local_bh_enable_ip+0x13a/0x240 [ 73.064877][ T9608] rfcomm_sock_ioctl+0x7e/0xa0 [ 73.070074][ T9608] sock_do_ioctl+0x7c/0x260 [ 73.074610][ T9608] sock_ioctl+0x463/0x690 [ 73.079023][ T9608] ? sock_poll+0x310/0x310 [ 73.083751][ T9608] do_vfs_ioctl+0x744/0x1730 [ 73.088959][ T9608] ? assoc_array_gc+0x13e1/0x1440 [ 73.094169][ T9608] ? tomoyo_file_ioctl+0x23/0x30 [ 73.099709][ T9608] ? security_file_ioctl+0xa1/0xd0 [ 73.105678][ T9608] __x64_sys_ioctl+0xe3/0x120 [ 73.115632][ T9608] do_syscall_64+0xfe/0x140 [ 73.126635][ T9608] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 73.132789][ T9608] RIP: 0033:0x441229 [ 73.137217][ T9608] Code: e8 fc ab 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 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 73.159232][ T9608] RSP: 002b:00007ffc74f64518 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 73.172227][ T9608] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441229 [ 73.182363][ T9608] RDX: 0000000020000100 RSI: 00000000400452c8 RDI: 0000000000000004 [ 73.190943][ T9608] RBP: 0000000000011c4f R08: 00000000004002c8 R09: 00000000004002c8 [ 73.199533][ T9608] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402050 [ 73.210316][ T9608] R13: 00000000004020e0 R14: 0000000000000000 R15: 0000000000000000 [ 73.221497][ T9608] Kernel Offset: disabled [ 73.226386][ T9608] Rebooting in 86400 seconds..