[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 62.206085][ T26] audit: type=1800 audit(1572346032.795:25): pid=8621 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.247319][ T26] audit: type=1800 audit(1572346032.795:26): pid=8621 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.289709][ T26] audit: type=1800 audit(1572346032.795:27): pid=8621 uid=0 auid=4294967295 ses=4294967295 subj==unconfined 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 '10.128.15.212' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 79.188981][ T8777] ------------[ cut here ]------------ [ 79.194646][ T8777] ODEBUG: free active (active state 0) object type: timer_list hint: rfcomm_dlc_timeout+0x0/0x90 [ 79.205391][ T8777] WARNING: CPU: 0 PID: 8777 at lib/debugobjects.c:481 debug_print_object+0x168/0x250 [ 79.214832][ T8777] Kernel panic - not syncing: panic_on_warn set ... [ 79.221406][ T8777] CPU: 0 PID: 8777 Comm: syz-executor121 Not tainted 5.4.0-rc3+ #0 [ 79.229409][ T8777] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.239463][ T8777] Call Trace: [ 79.242742][ T8777] dump_stack+0x172/0x1f0 [ 79.247071][ T8777] ? debug_print_object+0xa0/0x250 [ 79.252175][ T8777] panic+0x2e3/0x75c [ 79.256068][ T8777] ? add_taint.cold+0x16/0x16 [ 79.260729][ T8777] ? __kasan_check_write+0x14/0x20 [ 79.265834][ T8777] ? __warn.cold+0x14/0x35 [ 79.270236][ T8777] ? __warn+0xd9/0x1d0 [ 79.274302][ T8777] ? debug_print_object+0x168/0x250 [ 79.279566][ T8777] __warn.cold+0x2f/0x35 [ 79.283790][ T8777] ? debug_print_object+0x168/0x250 [ 79.288969][ T8777] report_bug+0x289/0x300 [ 79.293289][ T8777] do_error_trap+0x11b/0x200 [ 79.297860][ T8777] do_invalid_op+0x37/0x50 [ 79.302256][ T8777] ? debug_print_object+0x168/0x250 [ 79.307435][ T8777] invalid_op+0x23/0x30 [ 79.311601][ T8777] RIP: 0010:debug_print_object+0x168/0x250 [ 79.317397][ T8777] Code: dd 60 05 e7 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b5 00 00 00 48 8b 14 dd 60 05 e7 87 48 c7 c7 c0 fa e6 87 e8 80 e9 fc fd <0f> 0b 83 05 83 73 7f 06 01 48 83 c4 20 5b 41 5c 41 5d 41 5e 5d c3 [ 79.336986][ T8777] RSP: 0018:ffff8880984af8d8 EFLAGS: 00010086 [ 79.343030][ T8777] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 79.350982][ T8777] RDX: 0000000000000000 RSI: ffffffff815cbcd6 RDI: ffffed1013095f0d [ 79.358943][ T8777] RBP: ffff8880984af918 R08: ffff88809726c040 R09: ffffed1015d04101 [ 79.366919][ T8777] R10: ffffed1015d04100 R11: ffff8880ae820807 R12: 0000000000000001 [ 79.374877][ T8777] R13: ffffffff88fb5700 R14: ffffffff816278c0 R15: ffff88808cf211f8 [ 79.382843][ T8777] ? calc_wheel_index+0x220/0x220 [ 79.387855][ T8777] ? vprintk_func+0x86/0x189 [ 79.392429][ T8777] ? debug_print_object+0x168/0x250 [ 79.397628][ T8777] debug_check_no_obj_freed+0x2d4/0x43f [ 79.403157][ T8777] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 79.408689][ T8777] kfree+0xf8/0x2c0 [ 79.412480][ T8777] rfcomm_dlc_free+0x20/0x30 [ 79.417059][ T8777] rfcomm_dev_ioctl+0x183e/0x1b80 [ 79.422069][ T8777] ? mark_held_locks+0xa4/0xf0 [ 79.426813][ T8777] ? __local_bh_enable_ip+0x15a/0x270 [ 79.432163][ T8777] ? lock_sock_nested+0xe2/0x120 [ 79.437104][ T8777] ? __local_bh_enable_ip+0x15a/0x270 [ 79.442457][ T8777] ? rfcomm_dev_state_change+0x150/0x150 [ 79.448080][ T8777] ? __local_bh_enable_ip+0x15a/0x270 [ 79.453451][ T8777] rfcomm_sock_ioctl+0x90/0xb0 [ 79.458217][ T8777] sock_do_ioctl+0xd8/0x2f0 [ 79.462727][ T8777] ? compat_ifr_data_ioctl+0x160/0x160 [ 79.468271][ T8777] ? tomoyo_path_number_perm+0x459/0x520 [ 79.473889][ T8777] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 79.480124][ T8777] ? tomoyo_path_number_perm+0x263/0x520 [ 79.485739][ T8777] sock_ioctl+0x3ed/0x790 [ 79.490053][ T8777] ? dlci_ioctl_set+0x40/0x40 [ 79.494713][ T8777] ? __fd_install+0x1bc/0x640 [ 79.499389][ T8777] ? dlci_ioctl_set+0x40/0x40 [ 79.504191][ T8777] do_vfs_ioctl+0xdb6/0x13e0 [ 79.508773][ T8777] ? ioctl_preallocate+0x210/0x210 [ 79.513881][ T8777] ? __kasan_check_read+0x11/0x20 [ 79.518994][ T8777] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 79.525230][ T8777] ? __fd_install+0x200/0x640 [ 79.529941][ T8777] ? tomoyo_file_ioctl+0x23/0x30 [ 79.534867][ T8777] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 79.541094][ T8777] ? security_file_ioctl+0x8d/0xc0 [ 79.546190][ T8777] ksys_ioctl+0xab/0xd0 [ 79.550331][ T8777] __x64_sys_ioctl+0x73/0xb0 [ 79.554904][ T8777] do_syscall_64+0xfa/0x760 [ 79.559394][ T8777] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 79.565265][ T8777] RIP: 0033:0x441229 [ 79.569157][ T8777] 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 [ 79.588980][ T8777] RSP: 002b:00007fff4e6c58f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 79.597377][ T8777] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441229 [ 79.605339][ T8777] RDX: 0000000020000100 RSI: 00000000400452c8 RDI: 0000000000000004 [ 79.613298][ T8777] RBP: 000000000001352d R08: 00000000004002c8 R09: 00000000004002c8 [ 79.621282][ T8777] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402050 [ 79.629240][ T8777] R13: 00000000004020e0 R14: 0000000000000000 R15: 0000000000000000 [ 79.638609][ T8777] Kernel Offset: disabled [ 79.642998][ T8777] Rebooting in 86400 seconds..