[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 42.791670][ T26] audit: type=1800 audit(1572344588.445:25): pid=7979 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 42.819269][ T26] audit: type=1800 audit(1572344588.445:26): pid=7979 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 42.848381][ T26] audit: type=1800 audit(1572344588.445:27): pid=7979 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.77' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 58.279808][ T8131] ------------[ cut here ]------------ [ 58.285513][ T8131] ODEBUG: free active (active state 0) object type: timer_list hint: rfcomm_dlc_timeout+0x0/0x80 [ 58.296133][ T8131] WARNING: CPU: 1 PID: 8131 at lib/debugobjects.c:484 debug_check_no_obj_freed+0x464/0x5b0 [ 58.306101][ T8131] Kernel panic - not syncing: panic_on_warn set ... [ 58.312673][ T8131] CPU: 1 PID: 8131 Comm: syz-executor423 Not tainted 5.4.0-rc5+ #0 [ 58.320567][ T8131] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.330637][ T8131] Call Trace: [ 58.333914][ T8131] dump_stack+0x1d8/0x2f8 [ 58.338240][ T8131] panic+0x264/0x7a9 [ 58.342113][ T8131] ? __warn+0x105/0x210 [ 58.346263][ T8131] ? debug_check_no_obj_freed+0x464/0x5b0 [ 58.351972][ T8131] __warn+0x20e/0x210 [ 58.355943][ T8131] ? debug_check_no_obj_freed+0x464/0x5b0 [ 58.361659][ T8131] report_bug+0x1b6/0x2f0 [ 58.365969][ T8131] ? debug_check_no_obj_freed+0x464/0x5b0 [ 58.371755][ T8131] do_error_trap+0xd7/0x440 [ 58.376239][ T8131] do_invalid_op+0x36/0x40 [ 58.380632][ T8131] ? debug_check_no_obj_freed+0x464/0x5b0 [ 58.386446][ T8131] invalid_op+0x23/0x30 [ 58.390587][ T8131] RIP: 0010:debug_check_no_obj_freed+0x464/0x5b0 [ 58.397014][ T8131] 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 [ 58.416955][ T8131] RSP: 0018:ffff8880a4acfb78 EFLAGS: 00010046 [ 58.423006][ T8131] RAX: 99ef7d9defc43e00 RBX: ffffffff888d7ce0 RCX: ffff8880a19c8000 [ 58.430963][ T8131] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 58.438916][ T8131] RBP: ffff8880a4acfc10 R08: ffffffff815c8d24 R09: ffffed1015d640d2 [ 58.446869][ T8131] R10: ffffed1015d640d2 R11: 0000000000000000 R12: ffffffff884459ea [ 58.454821][ T8131] R13: ffffffff86c07220 R14: dffffc0000000000 R15: 0000000000000000 [ 58.462790][ T8131] ? rfcomm_dlc_alloc+0x3a0/0x3a0 [ 58.467811][ T8131] ? vprintk_emit+0x2d4/0x3a0 [ 58.472479][ T8131] ? debug_check_no_obj_freed+0x464/0x5b0 [ 58.478231][ T8131] ? rfcomm_dlc_free+0x1e/0x30 [ 58.482974][ T8131] kfree+0x107/0x200 [ 58.486851][ T8131] rfcomm_dlc_free+0x1e/0x30 [ 58.491435][ T8131] rfcomm_dev_ioctl+0xb9a/0x1c70 [ 58.496357][ T8131] ? __local_bh_enable_ip+0x13a/0x240 [ 58.501711][ T8131] rfcomm_sock_ioctl+0x7e/0xa0 [ 58.506497][ T8131] sock_do_ioctl+0x7c/0x260 [ 58.511009][ T8131] sock_ioctl+0x464/0x690 [ 58.515325][ T8131] ? sock_poll+0x310/0x310 [ 58.519728][ T8131] do_vfs_ioctl+0x744/0x1730 [ 58.524303][ T8131] ? debug_smp_processor_id+0x1/0x20 [ 58.529577][ T8131] ? tomoyo_file_ioctl+0x23/0x30 [ 58.534507][ T8131] ? security_file_ioctl+0xa1/0xd0 [ 58.539602][ T8131] __x64_sys_ioctl+0xe3/0x120 [ 58.544267][ T8131] do_syscall_64+0xf7/0x1c0 [ 58.548779][ T8131] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 58.554669][ T8131] RIP: 0033:0x441229 [ 58.558550][ T8131] 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 [ 58.578492][ T8131] RSP: 002b:00007ffceff60d48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 58.588188][ T8131] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441229 [ 58.596142][ T8131] RDX: 0000000020000100 RSI: 00000000400452c8 RDI: 0000000000000004 [ 58.604186][ T8131] RBP: 000000000000e389 R08: 00000000004002c8 R09: 00000000004002c8 [ 58.612150][ T8131] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402050 [ 58.620108][ T8131] R13: 00000000004020e0 R14: 0000000000000000 R15: 0000000000000000 [ 58.629673][ T8131] Kernel Offset: disabled [ 58.634056][ T8131] Rebooting in 86400 seconds..