[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 26.510892] kauditd_printk_skb: 7 callbacks suppressed [ 26.510904] audit: type=1800 audit(1539478716.204:29): pid=5245 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 26.545240] audit: type=1800 audit(1539478716.204:30): pid=5245 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.75' (ECDSA) to the list of known hosts. syzkaller login: [ 37.574894] IPVS: ftp: loaded support on port[0] = 21 executing program executing program [ 37.632536] WARNING: CPU: 0 PID: 5401 at kernel/cgroup/cgroup.c:2935 cgroup_apply_control_enable+0x22c/0xea0 [ 37.642685] Kernel panic - not syncing: panic_on_warn set ... [ 37.642685] [ 37.650080] CPU: 0 PID: 5401 Comm: syz-executor968 Not tainted 4.19.0-rc7+ #260 [ 37.657549] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.666888] Call Trace: [ 37.669471] dump_stack+0x1c4/0x2b4 [ 37.673102] ? dump_stack_print_info.cold.2+0x52/0x52 [ 37.678287] panic+0x238/0x4e7 [ 37.681469] ? add_taint.cold.5+0x16/0x16 [ 37.685649] ? __warn.cold.8+0x148/0x1ba [ 37.689699] ? __warn.cold.8+0x117/0x1ba [ 37.693747] ? cgroup_apply_control_enable+0x22c/0xea0 [ 37.699009] __warn.cold.8+0x163/0x1ba [ 37.702881] ? rcu_bh_qs+0xc0/0xc0 [ 37.706406] ? cgroup_apply_control_enable+0x22c/0xea0 [ 37.711671] report_bug+0x254/0x2d0 [ 37.715286] do_error_trap+0x1fc/0x4d0 [ 37.719162] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.724688] ? math_error+0x3f0/0x3f0 [ 37.728480] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.733320] ? trace_hardirqs_on_caller+0x310/0x310 [ 37.738325] ? graph_lock+0x170/0x170 [ 37.742158] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.747697] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.752532] do_invalid_op+0x1b/0x20 [ 37.756286] invalid_op+0x14/0x20 [ 37.759740] RIP: 0010:cgroup_apply_control_enable+0x22c/0xea0 [ 37.765617] Code: 48 c1 e8 03 42 80 3c 28 00 0f 85 18 0a 00 00 49 8b 5f 18 31 ff 83 e3 02 48 89 de e8 0e 64 07 00 48 85 db 74 07 e8 d4 62 07 00 <0f> 0b e8 cd 62 07 00 48 8b 85 a0 fe ff ff 48 c1 e8 03 42 80 3c 28 [ 37.784513] RSP: 0018:ffff8801bac277f0 EFLAGS: 00010293 [ 37.789891] RAX: ffff8801d8f08040 RBX: 0000000000000002 RCX: ffffffff81777672 [ 37.797150] RDX: 0000000000000000 RSI: ffffffff8177767c RDI: 0000000000000007 [ 37.804413] RBP: ffff8801bac279a0 R08: ffff8801d8f08040 R09: 1ffffffff1273965 [ 37.811675] R10: ffffed003b5c4732 R11: ffff8801dae23993 R12: ffffffff893c50c0 [ 37.818931] R13: dffffc0000000000 R14: 000000000000000b R15: ffff8801d8ce0ac0 [ 37.826200] ? cgroup_apply_control_enable+0x222/0xea0 [ 37.831465] ? cgroup_apply_control_enable+0x22c/0xea0 [ 37.836755] ? cgroup_save_control+0x2c0/0x2c0 [ 37.841326] ? css_next_descendant_pre+0x77/0x190 [ 37.846168] ? cgroup_propagate_control+0x3ef/0x5c0 [ 37.851193] ? css_next_descendant_pre+0x190/0x190 [ 37.856132] cgroup_apply_control+0x1f/0x50 [ 37.860444] cgroup_type_write+0x54b/0x710 [ 37.864672] ? cgroup_procs_write+0x500/0x500 [ 37.869154] cgroup_file_write+0x2f7/0x7e0 [ 37.873380] ? cgroup_migrate_add_task+0xcd0/0xcd0 [ 37.878301] ? __lock_is_held+0xb5/0x140 [ 37.882355] ? cgroup_migrate_add_task+0xcd0/0xcd0 [ 37.887275] kernfs_fop_write+0x2ba/0x480 [ 37.891417] __vfs_write+0x119/0x9f0 [ 37.895123] ? check_preemption_disabled+0x48/0x200 [ 37.900131] ? kernfs_fop_open+0xf90/0xf90 [ 37.904362] ? kernel_read+0x120/0x120 [ 37.908275] ? __lock_is_held+0xb5/0x140 [ 37.912357] ? rcu_read_lock_sched_held+0x108/0x120 [ 37.917451] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.922984] ? __sb_start_write+0x1b2/0x370 [ 37.927303] vfs_write+0x1fc/0x560 [ 37.930836] ksys_write+0x101/0x260 [ 37.934455] ? __ia32_sys_read+0xb0/0xb0 [ 37.938512] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 37.943962] __x64_sys_write+0x73/0xb0 [ 37.947849] do_syscall_64+0x1b9/0x820 [ 37.951727] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 37.957080] ? syscall_return_slowpath+0x5e0/0x5e0 [ 37.962003] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.966833] ? trace_hardirqs_on_caller+0x310/0x310 [ 37.971835] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 37.976838] ? prepare_exit_to_usermode+0x291/0x3b0 [ 37.981914] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.986760] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.991944] RIP: 0033:0x441c19 [ 37.995128] Code: e8 cc b2 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 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 38.014043] RSP: 002b:00007ffdc61ff6d8 EFLAGS: 00000213 ORIG_RAX: 0000000000000001 [ 38.021741] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441c19 [ 38.028998] RDX: 0000000000000009 RSI: 0000000020000140 RDI: 0000000000000006 [ 38.036398] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 38.043991] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000000001 [ 38.051266] R13: 00000000000092e4 R14: 0000000000000000 R15: 0000000000000000 [ 38.059684] Kernel Offset: disabled [ 38.063404] Rebooting in 86400 seconds..