[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 44.180286][ T26] audit: type=1800 audit(1572362174.452:25): pid=7803 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 44.218338][ T26] audit: type=1800 audit(1572362174.452:26): pid=7803 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 44.253615][ T26] audit: type=1800 audit(1572362174.452:27): pid=7803 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 '10.128.0.210' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 59.624865][ T7957] ------------[ cut here ]------------ [ 59.630560][ T7957] ODEBUG: free active (active state 0) object type: timer_list hint: rfcomm_dlc_timeout+0x0/0x80 [ 59.641202][ T7957] WARNING: CPU: 0 PID: 7957 at lib/debugobjects.c:484 debug_check_no_obj_freed+0x464/0x5b0 [ 59.651158][ T7957] Kernel panic - not syncing: panic_on_warn set ... [ 59.657720][ T7957] CPU: 0 PID: 7957 Comm: syz-executor306 Not tainted 5.4.0-rc5+ #0 [ 59.665725][ T7957] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.675762][ T7957] Call Trace: [ 59.679048][ T7957] dump_stack+0x1d8/0x2f8 [ 59.683551][ T7957] panic+0x264/0x7a9 [ 59.687428][ T7957] ? __warn+0x105/0x210 [ 59.691566][ T7957] ? debug_check_no_obj_freed+0x464/0x5b0 [ 59.697269][ T7957] __warn+0x20e/0x210 [ 59.701510][ T7957] ? debug_check_no_obj_freed+0x464/0x5b0 [ 59.707220][ T7957] report_bug+0x1b6/0x2f0 [ 59.711535][ T7957] ? debug_check_no_obj_freed+0x464/0x5b0 [ 59.717240][ T7957] do_error_trap+0xd7/0x440 [ 59.721722][ T7957] do_invalid_op+0x36/0x40 [ 59.726113][ T7957] ? debug_check_no_obj_freed+0x464/0x5b0 [ 59.731816][ T7957] invalid_op+0x23/0x30 [ 59.735946][ T7957] RIP: 0010:debug_check_no_obj_freed+0x464/0x5b0 [ 59.742249][ T7957] Code: 08 48 89 df e8 ad f7 63 fe 4c 8b 03 48 c7 c7 8e c9 40 88 48 c7 c6 7b ca 3e 88 4c 89 e2 44 89 f9 4d 89 e9 31 c0 e8 4c 51 fd fd <0f> 0b 4c 8b 6d a8 ff 05 e4 06 76 05 49 83 c5 30 4c 89 e8 48 c1 e8 [ 59.761830][ T7957] RSP: 0018:ffff88808b29fb78 EFLAGS: 00010046 [ 59.767885][ T7957] RAX: 5f3d27d350810600 RBX: ffffffff888d7ce0 RCX: ffff88808a81c5c0 [ 59.775832][ T7957] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 59.784649][ T7957] RBP: ffff88808b29fc10 R08: ffffffff815c8d24 R09: ffffed1015d440d2 [ 59.792597][ T7957] R10: ffffed1015d440d2 R11: 0000000000000000 R12: ffffffff884459ea [ 59.800546][ T7957] R13: ffffffff86c07220 R14: dffffc0000000000 R15: 0000000000000000 [ 59.808504][ T7957] ? rfcomm_dlc_alloc+0x3a0/0x3a0 [ 59.813506][ T7957] ? vprintk_emit+0x2d4/0x3a0 [ 59.818161][ T7957] ? debug_check_no_obj_freed+0x464/0x5b0 [ 59.823860][ T7957] ? rfcomm_dlc_free+0x1e/0x30 [ 59.828601][ T7957] kfree+0x107/0x200 [ 59.832488][ T7957] rfcomm_dlc_free+0x1e/0x30 [ 59.837067][ T7957] rfcomm_dev_ioctl+0xb9a/0x1c70 [ 59.841978][ T7957] ? __local_bh_enable_ip+0x13a/0x240 [ 59.847419][ T7957] rfcomm_sock_ioctl+0x7e/0xa0 [ 59.852158][ T7957] sock_do_ioctl+0x7c/0x260 [ 59.856639][ T7957] sock_ioctl+0x464/0x690 [ 59.860956][ T7957] ? sock_poll+0x310/0x310 [ 59.865348][ T7957] do_vfs_ioctl+0x744/0x1730 [ 59.869914][ T7957] ? debug_smp_processor_id+0x1/0x20 [ 59.875176][ T7957] ? tomoyo_file_ioctl+0x23/0x30 [ 59.880091][ T7957] ? security_file_ioctl+0xa1/0xd0 [ 59.885203][ T7957] __x64_sys_ioctl+0xe3/0x120 [ 59.890068][ T7957] do_syscall_64+0xf7/0x1c0 [ 59.894573][ T7957] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 59.900451][ T7957] RIP: 0033:0x441229 [ 59.904339][ T7957] 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 [ 59.923919][ T7957] RSP: 002b:00007ffd93bf3458 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 59.932312][ T7957] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441229 [ 59.940259][ T7957] RDX: 0000000020000100 RSI: 00000000400452c8 RDI: 0000000000000004 [ 59.948220][ T7957] RBP: 000000000000e8bd R08: 00000000004002c8 R09: 00000000004002c8 [ 59.956179][ T7957] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402050 [ 59.964131][ T7957] R13: 00000000004020e0 R14: 0000000000000000 R15: 0000000000000000 [ 59.973472][ T7957] Kernel Offset: disabled [ 59.977874][ T7957] Rebooting in 86400 seconds..