[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 54.653715][ T26] audit: type=1800 audit(1570860377.629:25): pid=8520 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 54.695183][ T26] audit: type=1800 audit(1570860377.639:26): pid=8520 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 54.720315][ T26] audit: type=1800 audit(1570860377.639:27): pid=8520 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 '10.128.10.56' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 88.998511][ T8675] ------------[ cut here ]------------ [ 89.004255][ T8675] ODEBUG: free active (active state 0) object type: timer_list hint: rfcomm_dlc_timeout+0x0/0x90 [ 89.014999][ T8675] WARNING: CPU: 1 PID: 8675 at lib/debugobjects.c:481 debug_print_object+0x168/0x250 [ 89.024462][ T8675] Kernel panic - not syncing: panic_on_warn set ... [ 89.031043][ T8675] CPU: 1 PID: 8675 Comm: syz-executor263 Not tainted 5.4.0-rc2+ #0 [ 89.039020][ T8675] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 89.049528][ T8675] Call Trace: [ 89.052815][ T8675] dump_stack+0x172/0x1f0 [ 89.057147][ T8675] ? debug_print_object+0x70/0x250 [ 89.062241][ T8675] panic+0x2e3/0x75c [ 89.066498][ T8675] ? add_taint.cold+0x16/0x16 [ 89.071286][ T8675] ? __kasan_check_write+0x14/0x20 [ 89.076388][ T8675] ? __warn.cold+0x14/0x35 [ 89.080887][ T8675] ? __warn+0xd9/0x1d0 [ 89.084956][ T8675] ? debug_print_object+0x168/0x250 [ 89.090150][ T8675] __warn.cold+0x2f/0x35 [ 89.094682][ T8675] ? debug_print_object+0x168/0x250 [ 89.099867][ T8675] report_bug+0x289/0x300 [ 89.104194][ T8675] do_error_trap+0x11b/0x200 [ 89.108781][ T8675] do_invalid_op+0x37/0x50 [ 89.113179][ T8675] ? debug_print_object+0x168/0x250 [ 89.118368][ T8675] invalid_op+0x23/0x30 [ 89.122507][ T8675] RIP: 0010:debug_print_object+0x168/0x250 [ 89.128319][ T8675] Code: dd c0 a6 e6 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b5 00 00 00 48 8b 14 dd c0 a6 e6 87 48 c7 c7 20 9c e6 87 e8 30 a7 ff fd <0f> 0b 83 05 53 3b 81 06 01 48 83 c4 20 5b 41 5c 41 5d 41 5e 5d c3 [ 89.147967][ T8675] RSP: 0018:ffff88809981f8d8 EFLAGS: 00010086 [ 89.154022][ T8675] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 89.162097][ T8675] RDX: 0000000000000000 RSI: ffffffff815cb516 RDI: ffffed1013303f0d [ 89.170075][ T8675] RBP: ffff88809981f918 R08: ffff8880a1f283c0 R09: ffffed1015d24101 [ 89.178043][ T8675] R10: ffffed1015d24100 R11: ffff8880ae920807 R12: 0000000000000001 [ 89.186434][ T8675] R13: ffffffff88fb5340 R14: ffffffff81627100 R15: ffff88809595ed58 [ 89.194404][ T8675] ? calc_wheel_index+0x220/0x220 [ 89.199430][ T8675] ? vprintk_func+0x86/0x189 [ 89.204006][ T8675] ? debug_print_object+0x168/0x250 [ 89.209190][ T8675] debug_check_no_obj_freed+0x2d4/0x43f [ 89.214735][ T8675] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 89.220267][ T8675] kfree+0xf8/0x2c0 [ 89.224074][ T8675] rfcomm_dlc_free+0x20/0x30 [ 89.228648][ T8675] rfcomm_dev_ioctl+0x183e/0x1b80 [ 89.233652][ T8675] ? mark_held_locks+0xa4/0xf0 [ 89.238403][ T8675] ? __local_bh_enable_ip+0x15a/0x270 [ 89.243771][ T8675] ? lock_sock_nested+0xe2/0x120 [ 89.248692][ T8675] ? __local_bh_enable_ip+0x15a/0x270 [ 89.254063][ T8675] ? rfcomm_dev_state_change+0x150/0x150 [ 89.259701][ T8675] ? __local_bh_enable_ip+0x15a/0x270 [ 89.265078][ T8675] rfcomm_sock_ioctl+0x90/0xb0 [ 89.269936][ T8675] sock_do_ioctl+0xd8/0x2f0 [ 89.274462][ T8675] ? compat_ifr_data_ioctl+0x160/0x160 [ 89.279933][ T8675] ? tomoyo_path_number_perm+0x459/0x520 [ 89.285581][ T8675] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 89.291809][ T8675] ? tomoyo_path_number_perm+0x263/0x520 [ 89.297437][ T8675] sock_ioctl+0x3ed/0x780 [ 89.301785][ T8675] ? dlci_ioctl_set+0x40/0x40 [ 89.306456][ T8675] ? __fd_install+0x1bc/0x640 [ 89.311126][ T8675] ? dlci_ioctl_set+0x40/0x40 [ 89.315802][ T8675] do_vfs_ioctl+0xdb6/0x13e0 [ 89.320394][ T8675] ? ioctl_preallocate+0x210/0x210 [ 89.325516][ T8675] ? __kasan_check_read+0x11/0x20 [ 89.330556][ T8675] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 89.336782][ T8675] ? __fd_install+0x200/0x640 [ 89.341570][ T8675] ? tomoyo_file_ioctl+0x23/0x30 [ 89.346500][ T8675] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 89.352732][ T8675] ? security_file_ioctl+0x8d/0xc0 [ 89.357833][ T8675] ksys_ioctl+0xab/0xd0 [ 89.362129][ T8675] __x64_sys_ioctl+0x73/0xb0 [ 89.366716][ T8675] do_syscall_64+0xfa/0x760 [ 89.371312][ T8675] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 89.377222][ T8675] RIP: 0033:0x441229 [ 89.381164][ T8675] 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 [ 89.400987][ T8675] RSP: 002b:00007ffc2a255f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 89.409385][ T8675] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441229 [ 89.417481][ T8675] RDX: 0000000020000100 RSI: 00000000400452c8 RDI: 0000000000000004 [ 89.425465][ T8675] RBP: 0000000000015b89 R08: 00000000004002c8 R09: 00000000004002c8 [ 89.433422][ T8675] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402050 [ 89.441478][ T8675] R13: 00000000004020e0 R14: 0000000000000000 R15: 0000000000000000 [ 89.450968][ T8675] Kernel Offset: disabled [ 89.455368][ T8675] Rebooting in 86400 seconds..