[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 55.595899][ T27] audit: type=1800 audit(1581668626.812:25): pid=8703 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 55.614810][ T27] audit: type=1800 audit(1581668626.812:26): pid=8703 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 55.658389][ T27] audit: type=1800 audit(1581668626.812:27): pid=8703 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 '10.128.10.3' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 71.077646][ T8858] ------------[ cut here ]------------ [ 71.083239][ T8858] ODEBUG: free active (active state 0) object type: timer_list hint: rfcomm_dlc_timeout+0x0/0xd0 [ 71.093983][ T8858] WARNING: CPU: 1 PID: 8858 at lib/debugobjects.c:488 debug_check_no_obj_freed+0x468/0x620 [ 71.104063][ T8858] Kernel panic - not syncing: panic_on_warn set ... [ 71.110823][ T8858] CPU: 1 PID: 8858 Comm: syz-executor849 Not tainted 5.6.0-rc1-syzkaller #0 [ 71.119514][ T8858] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.129560][ T8858] Call Trace: [ 71.132976][ T8858] dump_stack+0x1fb/0x318 [ 71.137309][ T8858] panic+0x264/0x7a9 [ 71.141200][ T8858] ? __warn+0x105/0x210 [ 71.145426][ T8858] ? debug_check_no_obj_freed+0x468/0x620 [ 71.151329][ T8858] __warn+0x209/0x210 [ 71.155308][ T8858] ? debug_check_no_obj_freed+0x468/0x620 [ 71.161028][ T8858] report_bug+0x1b6/0x2f0 [ 71.165513][ T8858] ? debug_check_no_obj_freed+0x468/0x620 [ 71.171241][ T8858] do_error_trap+0xcf/0x1c0 [ 71.175856][ T8858] do_invalid_op+0x36/0x40 [ 71.180306][ T8858] ? debug_check_no_obj_freed+0x468/0x620 [ 71.186019][ T8858] invalid_op+0x23/0x30 [ 71.190161][ T8858] RIP: 0010:debug_check_no_obj_freed+0x468/0x620 [ 71.196551][ T8858] Code: 08 48 89 df e8 39 15 0f fe 4c 8b 03 48 c7 c7 65 d2 f0 88 48 c7 c6 6f c3 ee 88 4c 89 e2 44 89 f9 4d 89 e9 31 c0 e8 a8 ae a3 fd <0f> 0b 48 ba 00 00 00 00 00 fc ff df 4c 8b 6d b0 ff 05 76 d5 c4 05 [ 71.216340][ T8858] RSP: 0018:ffffc9000206fbf8 EFLAGS: 00010046 [ 71.222397][ T8858] RAX: 450e48a0f34a0c00 RBX: ffffffff892ddb88 RCX: ffff8880a1ebe480 [ 71.230365][ T8858] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 71.238339][ T8858] RBP: ffffc9000206fc90 R08: ffffffff815fef04 R09: ffffed1015d64592 [ 71.246546][ T8858] R10: ffffed1015d64592 R11: 0000000000000000 R12: ffffffff88f4af7a [ 71.254514][ T8858] R13: ffffffff875897e0 R14: ffff88809a290200 R15: 0000000000000000 [ 71.262691][ T8858] ? rfcomm_dlc_alloc+0x390/0x390 [ 71.267828][ T8858] ? vprintk_emit+0x2d4/0x3a0 [ 71.272606][ T8858] ? debug_check_no_obj_freed+0x468/0x620 [ 71.278380][ T8858] ? rfcomm_dlc_free+0x1e/0x30 [ 71.283243][ T8858] kfree+0xff/0x220 [ 71.287048][ T8858] rfcomm_dlc_free+0x1e/0x30 [ 71.291635][ T8858] rfcomm_dev_ioctl+0xe4d/0x2320 [ 71.296791][ T8858] ? __local_bh_enable_ip+0x13a/0x240 [ 71.302273][ T8858] rfcomm_sock_ioctl+0x7e/0xa0 [ 71.307047][ T8858] sock_do_ioctl+0x7c/0x260 [ 71.311552][ T8858] ? do_vfs_ioctl+0x758/0x19d0 [ 71.316316][ T8858] ? assoc_array_gc+0x13f1/0x1420 [ 71.321474][ T8858] sock_ioctl+0x464/0x690 [ 71.325800][ T8858] ? tomoyo_file_ioctl+0x23/0x30 [ 71.330741][ T8858] ? security_file_ioctl+0xb1/0xd0 [ 71.335843][ T8858] ? sock_poll+0x310/0x310 [ 71.340247][ T8858] __se_sys_ioctl+0x113/0x190 [ 71.344922][ T8858] __x64_sys_ioctl+0x7b/0x90 [ 71.349501][ T8858] do_syscall_64+0xf7/0x1c0 [ 71.354006][ T8858] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 71.360055][ T8858] RIP: 0033:0x4412c9 [ 71.363940][ T8858] 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 [ 71.383773][ T8858] RSP: 002b:00007ffcec15ab78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 71.392174][ T8858] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004412c9 [ 71.400135][ T8858] RDX: 0000000020000100 RSI: 00000000400452c8 RDI: 0000000000000005 [ 71.408098][ T8858] RBP: 0000000000011580 R08: 00000000004002c8 R09: 00000000004002c8 [ 71.416141][ T8858] R10: 00000000004002c8 R11: 0000000000000246 R12: 00000000004020f0 [ 71.424244][ T8858] R13: 0000000000402180 R14: 0000000000000000 R15: 0000000000000000 [ 71.433894][ T8858] Kernel Offset: disabled [ 71.438286][ T8858] Rebooting in 86400 seconds..