[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 41.487419][ T26] audit: type=1800 audit(1570857786.213:25): pid=7774 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 41.526339][ T26] audit: type=1800 audit(1570857786.213:26): pid=7774 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 41.567933][ T26] audit: type=1800 audit(1570857786.213:27): pid=7774 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 '10.128.0.159' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 59.862691][ T7928] ------------[ cut here ]------------ [ 59.868519][ T7928] ODEBUG: free active (active state 0) object type: timer_list hint: rfcomm_dlc_timeout+0x0/0x80 [ 59.880472][ T7928] WARNING: CPU: 1 PID: 7928 at lib/debugobjects.c:484 debug_check_no_obj_freed+0x464/0x5b0 [ 59.890479][ T7928] Kernel panic - not syncing: panic_on_warn set ... [ 59.897155][ T7928] CPU: 1 PID: 7928 Comm: syz-executor834 Not tainted 5.4.0-rc2+ #0 [ 59.905020][ T7928] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.915523][ T7928] Call Trace: [ 59.918813][ T7928] dump_stack+0x1d8/0x2f8 [ 59.923148][ T7928] panic+0x264/0x7a9 [ 59.927028][ T7928] ? __warn+0x105/0x210 [ 59.931172][ T7928] ? debug_check_no_obj_freed+0x464/0x5b0 [ 59.936902][ T7928] __warn+0x20e/0x210 [ 59.940955][ T7928] ? debug_check_no_obj_freed+0x464/0x5b0 [ 59.946653][ T7928] report_bug+0x1b6/0x2f0 [ 59.950961][ T7928] ? debug_check_no_obj_freed+0x464/0x5b0 [ 59.956851][ T7928] do_error_trap+0xd7/0x440 [ 59.961350][ T7928] do_invalid_op+0x36/0x40 [ 59.966083][ T7928] ? debug_check_no_obj_freed+0x464/0x5b0 [ 59.971894][ T7928] invalid_op+0x23/0x30 [ 59.976044][ T7928] RIP: 0010:debug_check_no_obj_freed+0x464/0x5b0 [ 59.982355][ T7928] Code: 08 48 89 df e8 4d 0b 66 fe 4c 8b 03 48 c7 c7 8e 5c 40 88 48 c7 c6 7b 63 3e 88 4c 89 e2 44 89 f9 4d 89 e9 31 c0 e8 2c 7d ff fd <0f> 0b 4c 8b 6d a8 ff 05 24 10 78 05 49 83 c5 30 4c 89 e8 48 c1 e8 [ 60.002027][ T7928] RSP: 0018:ffff8880a0557b78 EFLAGS: 00010046 [ 60.008075][ T7928] RAX: 3b9fd2681db10800 RBX: ffffffff888d7b60 RCX: ffff88809a4da380 [ 60.016049][ T7928] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 60.024019][ T7928] RBP: ffff8880a0557c10 R08: ffffffff815c8154 R09: ffffed1015d640d2 [ 60.032056][ T7928] R10: ffffed1015d640d2 R11: 0000000000000000 R12: ffffffff8843ed6a [ 60.040032][ T7928] R13: ffffffff86b93a80 R14: dffffc0000000000 R15: 0000000000000000 [ 60.047992][ T7928] ? rfcomm_dlc_alloc+0x3a0/0x3a0 [ 60.053000][ T7928] ? vprintk_emit+0x2d4/0x3a0 [ 60.057666][ T7928] ? debug_check_no_obj_freed+0x464/0x5b0 [ 60.063367][ T7928] ? rfcomm_dlc_free+0x1e/0x30 [ 60.068294][ T7928] kfree+0x107/0x200 [ 60.072182][ T7928] rfcomm_dlc_free+0x1e/0x30 [ 60.076765][ T7928] rfcomm_dev_ioctl+0xb9a/0x1c70 [ 60.081683][ T7928] ? __local_bh_enable_ip+0x13a/0x240 [ 60.087040][ T7928] rfcomm_sock_ioctl+0x7e/0xa0 [ 60.091872][ T7928] sock_do_ioctl+0x7c/0x260 [ 60.096360][ T7928] sock_ioctl+0x461/0x680 [ 60.100683][ T7928] ? sock_poll+0x310/0x310 [ 60.105210][ T7928] do_vfs_ioctl+0x744/0x1730 [ 60.109793][ T7928] ? assoc_array_gc+0x13c1/0x1440 [ 60.115031][ T7928] ? tomoyo_file_ioctl+0x23/0x30 [ 60.120004][ T7928] ? security_file_ioctl+0xa1/0xd0 [ 60.125143][ T7928] __x64_sys_ioctl+0xe3/0x120 [ 60.129822][ T7928] do_syscall_64+0xf7/0x1c0 [ 60.134328][ T7928] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 60.140215][ T7928] RIP: 0033:0x441229 [ 60.144200][ T7928] 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 [ 60.163810][ T7928] RSP: 002b:00007fff7836cf08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 60.172219][ T7928] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441229 [ 60.180170][ T7928] RDX: 0000000020000100 RSI: 00000000400452c8 RDI: 0000000000000004 [ 60.188123][ T7928] RBP: 000000000000e9a7 R08: 00000000004002c8 R09: 00000000004002c8 [ 60.196098][ T7928] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402050 [ 60.204054][ T7928] R13: 00000000004020e0 R14: 0000000000000000 R15: 0000000000000000 [ 60.213925][ T7928] Kernel Offset: disabled [ 60.218541][ T7928] Rebooting in 86400 seconds..