[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 59.923223][ T23] audit: type=1800 audit(1574017362.296:25): pid=8837 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 59.957763][ T23] audit: type=1800 audit(1574017362.296:26): pid=8837 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 59.981902][ T23] audit: type=1800 audit(1574017362.296:27): pid=8837 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[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 '10.128.1.12' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 83.649971][ T8993] ------------[ cut here ]------------ [ 83.655831][ T8993] ODEBUG: free active (active state 0) object type: timer_list hint: rfcomm_dlc_timeout+0x0/0x90 [ 83.666552][ T8993] WARNING: CPU: 0 PID: 8993 at lib/debugobjects.c:481 debug_print_object+0x168/0x250 [ 83.676005][ T8993] Kernel panic - not syncing: panic_on_warn set ... [ 83.682596][ T8993] CPU: 0 PID: 8993 Comm: syz-executor841 Not tainted 5.4.0-rc7-next-20191115 #0 [ 83.691590][ T8993] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.701634][ T8993] Call Trace: [ 83.704923][ T8993] dump_stack+0x197/0x210 [ 83.709238][ T8993] ? debug_print_object+0x150/0x250 [ 83.714414][ T8993] panic+0x2e3/0x75c [ 83.718313][ T8993] ? add_taint.cold+0x16/0x16 [ 83.722987][ T8993] ? __kasan_check_write+0x14/0x20 [ 83.728080][ T8993] ? __warn.cold+0x14/0x35 [ 83.732471][ T8993] ? __warn+0xd9/0x1d0 [ 83.736518][ T8993] ? debug_print_object+0x168/0x250 [ 83.741820][ T8993] __warn.cold+0x2f/0x35 [ 83.747032][ T8993] ? debug_print_object+0x168/0x250 [ 83.752227][ T8993] report_bug+0x289/0x300 [ 83.756553][ T8993] do_error_trap+0x11b/0x200 [ 83.761130][ T8993] do_invalid_op+0x37/0x50 [ 83.765562][ T8993] ? debug_print_object+0x168/0x250 [ 83.770776][ T8993] invalid_op+0x23/0x30 [ 83.774916][ T8993] RIP: 0010:debug_print_object+0x168/0x250 [ 83.780699][ T8993] Code: dd 20 7b e7 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b5 00 00 00 48 8b 14 dd 20 7b e7 87 48 c7 c7 80 70 e7 87 e8 70 50 fa fd <0f> 0b 83 05 b3 2a 7e 06 01 48 83 c4 20 5b 41 5c 41 5d 41 5e 5d c3 [ 83.800279][ T8993] RSP: 0018:ffff88808e1cf8d8 EFLAGS: 00010086 [ 83.806320][ T8993] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 83.814268][ T8993] RDX: 0000000000000000 RSI: ffffffff815d6fe6 RDI: ffffed1011c39f0d [ 83.822215][ T8993] RBP: ffff88808e1cf918 R08: ffff8880979d03c0 R09: ffffed1015d045c9 [ 83.830161][ T8993] R10: ffffed1015d045c8 R11: ffff8880ae822e43 R12: 0000000000000001 [ 83.838107][ T8993] R13: ffffffff88fb7120 R14: ffffffff816332e0 R15: ffff8880a028fc08 [ 83.846062][ T8993] ? calc_wheel_index+0x220/0x220 [ 83.851069][ T8993] ? vprintk_func+0x86/0x189 [ 83.855640][ T8993] ? debug_print_object+0x168/0x250 [ 83.860818][ T8993] debug_check_no_obj_freed+0x2d4/0x43f [ 83.866340][ T8993] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 83.871880][ T8993] kfree+0xf8/0x2c0 [ 83.875689][ T8993] rfcomm_dlc_free+0x20/0x30 [ 83.880472][ T8993] rfcomm_dev_ioctl+0x18b3/0x1c00 [ 83.885487][ T8993] ? mark_held_locks+0xa4/0xf0 [ 83.890341][ T8993] ? __local_bh_enable_ip+0x15a/0x270 [ 83.895708][ T8993] ? lock_sock_nested+0xe2/0x120 [ 83.900636][ T8993] ? __local_bh_enable_ip+0x15a/0x270 [ 83.906163][ T8993] ? rfcomm_dev_state_change+0x150/0x150 [ 83.911807][ T8993] ? __local_bh_enable_ip+0x15a/0x270 [ 83.917160][ T8993] rfcomm_sock_ioctl+0x90/0xb0 [ 83.921908][ T8993] sock_do_ioctl+0xd8/0x2f0 [ 83.926407][ T8993] ? compat_ifr_data_ioctl+0x160/0x160 [ 83.931848][ T8993] ? tomoyo_path_number_perm+0x454/0x520 [ 83.937475][ T8993] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 83.943711][ T8993] ? tomoyo_path_number_perm+0x25e/0x520 [ 83.949342][ T8993] sock_ioctl+0x3ed/0x790 [ 83.953657][ T8993] ? dlci_ioctl_set+0x40/0x40 [ 83.958341][ T8993] ? __fd_install+0x1bc/0x640 [ 83.963011][ T8993] ? dlci_ioctl_set+0x40/0x40 [ 83.967673][ T8993] do_vfs_ioctl+0x977/0x14e0 [ 83.972244][ T8993] ? compat_ioctl_preallocate+0x220/0x220 [ 83.977947][ T8993] ? __kasan_check_read+0x11/0x20 [ 83.982954][ T8993] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 83.989259][ T8993] ? __fd_install+0x1fb/0x640 [ 83.994010][ T8993] ? tomoyo_file_ioctl+0x23/0x30 [ 83.998926][ T8993] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 84.005250][ T8993] ? security_file_ioctl+0x8d/0xc0 [ 84.010409][ T8993] ksys_ioctl+0xab/0xd0 [ 84.014542][ T8993] __x64_sys_ioctl+0x73/0xb0 [ 84.019111][ T8993] do_syscall_64+0xfa/0x790 [ 84.023596][ T8993] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 84.029551][ T8993] RIP: 0033:0x441229 [ 84.033434][ T8993] 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 [ 84.053102][ T8993] RSP: 002b:00007ffee7c47028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 84.061507][ T8993] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441229 [ 84.069471][ T8993] RDX: 0000000020000100 RSI: 00000000400452c8 RDI: 0000000000000004 [ 84.077483][ T8993] RBP: 00000000000146ad R08: 00000000004002c8 R09: 00000000004002c8 [ 84.085452][ T8993] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402050 [ 84.093505][ T8993] R13: 00000000004020e0 R14: 0000000000000000 R15: 0000000000000000 [ 84.104141][ T8993] Kernel Offset: disabled [ 84.108543][ T8993] Rebooting in 86400 seconds..