[....] 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. [ 26.599338] kauditd_printk_skb: 7 callbacks suppressed [ 26.599349] audit: type=1800 audit(1539477713.161:29): pid=5225 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 [ 26.625164] audit: type=1800 audit(1539477713.171:30): pid=5225 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 '10.128.0.45' (ECDSA) to the list of known hosts. syzkaller login: [ 36.778103] IPVS: ftp: loaded support on port[0] = 21 executing program executing program [ 36.836280] WARNING: CPU: 0 PID: 5383 at kernel/cgroup/cgroup.c:2935 cgroup_apply_control_enable+0x22c/0xea0 [ 36.846340] Kernel panic - not syncing: panic_on_warn set ... [ 36.846340] [ 36.853713] CPU: 0 PID: 5383 Comm: syz-executor798 Not tainted 4.19.0-rc7+ #185 [ 36.861145] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.870490] Call Trace: [ 36.873124] dump_stack+0x1c4/0x2b4 [ 36.876748] ? dump_stack_print_info.cold.2+0x52/0x52 [ 36.881937] panic+0x238/0x4e7 [ 36.885127] ? add_taint.cold.5+0x16/0x16 [ 36.889269] ? __warn.cold.8+0x148/0x1ba [ 36.893315] ? __warn.cold.8+0x117/0x1ba [ 36.897367] ? cgroup_apply_control_enable+0x22c/0xea0 [ 36.902633] __warn.cold.8+0x163/0x1ba [ 36.906530] ? rcu_bh_qs+0xc0/0xc0 [ 36.910080] ? cgroup_apply_control_enable+0x22c/0xea0 [ 36.915383] report_bug+0x254/0x2d0 [ 36.919018] do_error_trap+0x1fc/0x4d0 [ 36.922896] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.928423] ? math_error+0x3f0/0x3f0 [ 36.932213] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.937059] ? trace_hardirqs_on_caller+0x310/0x310 [ 36.942063] ? graph_lock+0x170/0x170 [ 36.945854] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.951396] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.956239] do_invalid_op+0x1b/0x20 [ 36.959950] invalid_op+0x14/0x20 [ 36.963396] RIP: 0010:cgroup_apply_control_enable+0x22c/0xea0 [ 36.969307] 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 [ 36.988215] RSP: 0018:ffff8801bb36f7a0 EFLAGS: 00010293 [ 36.993591] RAX: ffff8801d8e92040 RBX: 0000000000000002 RCX: ffffffff81774672 [ 37.000849] RDX: 0000000000000000 RSI: ffffffff8177467c RDI: 0000000000000007 [ 37.008103] RBP: ffff8801bb36f950 R08: ffff8801d8e92040 R09: 1ffffffff1273955 [ 37.015359] R10: ffffed003b5c4732 R11: ffff8801dae23993 R12: ffffffff893c5020 [ 37.022617] R13: dffffc0000000000 R14: 000000000000000b R15: ffff8801bdf68300 [ 37.029914] ? cgroup_apply_control_enable+0x222/0xea0 [ 37.035191] ? cgroup_apply_control_enable+0x22c/0xea0 [ 37.040476] ? cgroup_save_control+0x2c0/0x2c0 [ 37.045052] ? css_next_descendant_pre+0x77/0x190 [ 37.049890] ? cgroup_propagate_control+0x3ef/0x5c0 [ 37.054896] ? css_next_descendant_pre+0x190/0x190 [ 37.059843] cgroup_apply_control+0x1f/0x50 [ 37.064173] cgroup_type_write+0x54b/0x710 [ 37.068402] ? cgroup_procs_write+0x500/0x500 [ 37.072885] cgroup_file_write+0x2f7/0x7e0 [ 37.077113] ? cgroup_migrate_add_task+0xcd0/0xcd0 [ 37.082032] ? __lock_is_held+0xb5/0x140 [ 37.086084] ? cgroup_migrate_add_task+0xcd0/0xcd0 [ 37.091008] kernfs_fop_write+0x2ba/0x480 [ 37.095146] __vfs_write+0x119/0x9f0 [ 37.098860] ? check_preemption_disabled+0x48/0x200 [ 37.103881] ? kernfs_fop_open+0xf90/0xf90 [ 37.108104] ? kernel_read+0x120/0x120 [ 37.111989] ? __lock_is_held+0xb5/0x140 [ 37.116045] ? rcu_read_lock_sched_held+0x108/0x120 [ 37.121068] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.126592] ? __sb_start_write+0x1b2/0x370 [ 37.130904] vfs_write+0x1fc/0x560 [ 37.134451] ksys_write+0x101/0x260 [ 37.138068] ? __ia32_sys_read+0xb0/0xb0 [ 37.142127] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 37.147567] __ia32_sys_write+0x71/0xb0 [ 37.151558] do_fast_syscall_32+0x34d/0xfb2 [ 37.155889] ? do_int80_syscall_32+0x890/0x890 [ 37.160465] ? entry_SYSENTER_compat+0x68/0x7f [ 37.165051] ? trace_hardirqs_off_caller+0xbb/0x310 [ 37.170071] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.174913] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.179764] ? trace_hardirqs_on_caller+0x310/0x310 [ 37.184771] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 37.189778] ? prepare_exit_to_usermode+0x291/0x3b0 [ 37.194804] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.199651] entry_SYSENTER_compat+0x70/0x7f [ 37.204060] RIP: 0023:0xf7f70ca9 [ 37.207436] Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 0c 24 c3 8b 1c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 37.226340] RSP: 002b:00000000ffe8b3ac EFLAGS: 00000246 ORIG_RAX: 0000000000000004 [ 37.234034] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000020000140 [ 37.241290] RDX: 0000000000000009 RSI: 00000000000027eb RDI: 00000000ffffffff [ 37.248541] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 37.255824] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 37.263077] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 37.271326] Kernel Offset: disabled [ 37.275031] Rebooting in 86400 seconds..