[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 68.663723][ T27] audit: type=1800 audit(1578536408.631:25): pid=9480 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 68.685008][ T27] audit: type=1800 audit(1578536408.631:26): pid=9480 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 68.741480][ T27] audit: type=1800 audit(1578536408.631:27): pid=9480 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 '10.128.0.64' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 77.027605][ T9634] ------------[ cut here ]------------ [ 77.033222][ T9634] ODEBUG: free active (active state 0) object type: timer_list hint: rfcomm_dlc_timeout+0x0/0xe0 [ 77.043998][ T9634] WARNING: CPU: 1 PID: 9634 at lib/debugobjects.c:481 debug_print_object+0x168/0x250 [ 77.053435][ T9634] Kernel panic - not syncing: panic_on_warn set ... [ 77.060009][ T9634] CPU: 1 PID: 9634 Comm: syz-executor988 Not tainted 5.5.0-rc4-syzkaller #0 [ 77.068654][ T9634] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.078690][ T9634] Call Trace: [ 77.081961][ T9634] dump_stack+0x197/0x210 [ 77.086283][ T9634] ? debug_print_object+0x90/0x250 [ 77.091376][ T9634] panic+0x2e3/0x75c [ 77.095268][ T9634] ? add_taint.cold+0x16/0x16 [ 77.099936][ T9634] ? __kasan_check_write+0x14/0x20 [ 77.105049][ T9634] ? __warn.cold+0x14/0x3e [ 77.109466][ T9634] ? __warn+0xd9/0x1cf [ 77.113554][ T9634] ? debug_print_object+0x168/0x250 [ 77.118741][ T9634] __warn.cold+0x2f/0x3e [ 77.122966][ T9634] ? debug_print_object+0x168/0x250 [ 77.128172][ T9634] report_bug+0x289/0x300 [ 77.132482][ T9634] do_error_trap+0x11b/0x200 [ 77.137055][ T9634] do_invalid_op+0x37/0x50 [ 77.141467][ T9634] ? debug_print_object+0x168/0x250 [ 77.146644][ T9634] invalid_op+0x23/0x30 [ 77.150789][ T9634] RIP: 0010:debug_print_object+0x168/0x250 [ 77.156572][ T9634] Code: dd 40 87 71 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b5 00 00 00 48 8b 14 dd 40 87 71 88 48 c7 c7 a0 7c 71 88 e8 87 20 a6 fd <0f> 0b 83 05 73 03 dc 06 01 48 83 c4 20 5b 41 5c 41 5d 41 5e 5d c3 [ 77.176179][ T9634] RSP: 0018:ffffc90001d579f0 EFLAGS: 00010082 [ 77.182225][ T9634] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 77.190181][ T9634] RDX: 0000000000000000 RSI: ffffffff815e8516 RDI: fffff520003aaf30 [ 77.198237][ T9634] RBP: ffffc90001d57a30 R08: ffff8880a10cc380 R09: ffffed1015d245c9 [ 77.206187][ T9634] R10: ffffed1015d245c8 R11: ffff8880ae922e43 R12: 0000000000000001 [ 77.214139][ T9634] R13: ffffffff899af700 R14: ffffffff816454c0 R15: ffff888090c89930 [ 77.222103][ T9634] ? calc_wheel_index+0x220/0x220 [ 77.228441][ T9634] ? vprintk_func+0x86/0x189 [ 77.233046][ T9634] debug_check_no_obj_freed+0x2d4/0x43f [ 77.238582][ T9634] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 77.244122][ T9634] kfree+0xf8/0x2c0 [ 77.247917][ T9634] rfcomm_dlc_free+0x20/0x30 [ 77.252487][ T9634] rfcomm_sock_destruct+0x13e/0x1b0 [ 77.257679][ T9634] ? rfcomm_sock_release+0x150/0x150 [ 77.262948][ T9634] __sk_destruct+0x53/0x7f0 [ 77.267447][ T9634] sk_destruct+0xd5/0x110 [ 77.271756][ T9634] __sk_free+0xfb/0x360 [ 77.275902][ T9634] sk_free+0x83/0xb0 [ 77.279787][ T9634] rfcomm_sock_kill+0x13f/0x160 [ 77.284626][ T9634] rfcomm_sock_release+0x113/0x150 [ 77.289725][ T9634] __sock_release+0xce/0x280 [ 77.294294][ T9634] sock_close+0x1e/0x30 [ 77.298428][ T9634] __fput+0x2ff/0x890 [ 77.302398][ T9634] ? __sock_release+0x280/0x280 [ 77.307227][ T9634] ____fput+0x16/0x20 [ 77.311185][ T9634] task_work_run+0x145/0x1c0 [ 77.315757][ T9634] do_exit+0x8e7/0x2ef0 [ 77.319899][ T9634] ? mm_update_next_owner+0x7c0/0x7c0 [ 77.325259][ T9634] ? preempt_schedule_common+0x63/0xe0 [ 77.330715][ T9634] ? preempt_schedule+0x4b/0x60 [ 77.335560][ T9634] ? ___preempt_schedule+0x16/0x18 [ 77.340658][ T9634] do_group_exit+0x135/0x360 [ 77.345281][ T9634] __x64_sys_exit_group+0x44/0x50 [ 77.350290][ T9634] do_syscall_64+0xfa/0x790 [ 77.354780][ T9634] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 77.360653][ T9634] RIP: 0033:0x4444d8 [ 77.364533][ T9634] Code: Bad RIP value. [ 77.368595][ T9634] RSP: 002b:00007fff8a2c1118 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 77.376983][ T9634] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004444d8 [ 77.384934][ T9634] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 77.392902][ T9634] RBP: 00000000004cc070 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 77.400904][ T9634] R10: 000000037ffffa00 R11: 0000000000000246 R12: 0000000000000001 [ 77.408866][ T9634] R13: 00000000006df320 R14: 0000000000000000 R15: 0000000000000000 [ 77.418321][ T9634] Kernel Offset: disabled [ 77.422715][ T9634] Rebooting in 86400 seconds..