[....] 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. [ 27.075658] kauditd_printk_skb: 8 callbacks suppressed [ 27.075668] audit: type=1800 audit(1539477670.361:29): pid=5241 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 27.106495] audit: type=1800 audit(1539477670.361:30): pid=5241 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.113' (ECDSA) to the list of known hosts. syzkaller login: [ 47.514693] IPVS: ftp: loaded support on port[0] = 21 executing program executing program [ 47.573948] WARNING: CPU: 1 PID: 5400 at kernel/cgroup/cgroup.c:2935 cgroup_apply_control_enable+0x22c/0xea0 [ 47.584008] Kernel panic - not syncing: panic_on_warn set ... [ 47.584008] [ 47.591364] CPU: 1 PID: 5400 Comm: syz-executor875 Not tainted 4.19.0-rc7+ #59 [ 47.598706] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.608041] Call Trace: [ 47.610623] dump_stack+0x1c4/0x2b4 [ 47.614266] ? dump_stack_print_info.cold.2+0x52/0x52 [ 47.619463] panic+0x238/0x4e7 [ 47.622644] ? add_taint.cold.5+0x16/0x16 [ 47.626786] ? __warn.cold.8+0x148/0x1ba [ 47.630839] ? __warn.cold.8+0x117/0x1ba [ 47.634891] ? cgroup_apply_control_enable+0x22c/0xea0 [ 47.640157] __warn.cold.8+0x163/0x1ba [ 47.644032] ? rcu_bh_qs+0xc0/0xc0 [ 47.647573] ? cgroup_apply_control_enable+0x22c/0xea0 [ 47.652844] report_bug+0x254/0x2d0 [ 47.656477] do_error_trap+0x1fc/0x4d0 [ 47.660369] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.665898] ? math_error+0x3f0/0x3f0 [ 47.669692] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.674523] ? trace_hardirqs_on_caller+0x310/0x310 [ 47.679526] ? graph_lock+0x170/0x170 [ 47.683336] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.688893] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.693742] do_invalid_op+0x1b/0x20 [ 47.697444] invalid_op+0x14/0x20 [ 47.700888] RIP: 0010:cgroup_apply_control_enable+0x22c/0xea0 [ 47.706760] 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 [ 47.725658] RSP: 0018:ffff8801ba0bf7f0 EFLAGS: 00010293 [ 47.731007] RAX: ffff8801ba0ce040 RBX: 0000000000000002 RCX: ffffffff81774672 [ 47.738263] RDX: 0000000000000000 RSI: ffffffff8177467c RDI: 0000000000000007 [ 47.745529] RBP: ffff8801ba0bf9a0 R08: ffff8801ba0ce040 R09: 1ffffffff1273955 [ 47.752787] R10: ffffed003b5e4732 R11: ffff8801daf23993 R12: ffffffff893c5020 [ 47.760049] R13: dffffc0000000000 R14: 000000000000000b R15: ffff8801d87d30c0 [ 47.767317] ? cgroup_apply_control_enable+0x222/0xea0 [ 47.772582] ? cgroup_apply_control_enable+0x22c/0xea0 [ 47.777855] ? cgroup_save_control+0x2c0/0x2c0 [ 47.782428] ? css_next_descendant_pre+0x77/0x190 [ 47.787261] ? cgroup_propagate_control+0x3ef/0x5c0 [ 47.792293] ? css_next_descendant_pre+0x190/0x190 [ 47.797218] cgroup_apply_control+0x1f/0x50 [ 47.801530] cgroup_type_write+0x54b/0x710 [ 47.805773] ? cgroup_procs_write+0x500/0x500 [ 47.810266] cgroup_file_write+0x2f7/0x7e0 [ 47.814507] ? cgroup_migrate_add_task+0xcd0/0xcd0 [ 47.819432] ? __lock_is_held+0xb5/0x140 [ 47.823488] ? cgroup_migrate_add_task+0xcd0/0xcd0 [ 47.828406] kernfs_fop_write+0x2ba/0x480 [ 47.832545] __vfs_write+0x119/0x9f0 [ 47.836250] ? check_preemption_disabled+0x48/0x200 [ 47.841271] ? kernfs_fop_open+0xf90/0xf90 [ 47.845520] ? kernel_read+0x120/0x120 [ 47.849401] ? __lock_is_held+0xb5/0x140 [ 47.853473] ? rcu_read_lock_sched_held+0x108/0x120 [ 47.858497] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.864025] ? __sb_start_write+0x1b2/0x370 [ 47.868362] vfs_write+0x1fc/0x560 [ 47.871926] ksys_write+0x101/0x260 [ 47.875556] ? __ia32_sys_read+0xb0/0xb0 [ 47.879612] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 47.885071] __x64_sys_write+0x73/0xb0 [ 47.888966] do_syscall_64+0x1b9/0x820 [ 47.892859] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 47.898228] ? syscall_return_slowpath+0x5e0/0x5e0 [ 47.903146] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.907976] ? trace_hardirqs_on_caller+0x310/0x310 [ 47.912985] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 47.918006] ? prepare_exit_to_usermode+0x291/0x3b0 [ 47.923022] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.927858] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.933036] RIP: 0033:0x441c19 [ 47.936217] 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 [ 47.955103] RSP: 002b:00007ffeeb2f6bc8 EFLAGS: 00000213 ORIG_RAX: 0000000000000001 [ 47.962831] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441c19 [ 47.970087] RDX: 0000000000000009 RSI: 0000000020000140 RDI: 0000000000000006 [ 47.977346] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 47.984601] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000000001 [ 47.992022] R13: 000000000000b9b9 R14: 0000000000000000 R15: 0000000000000000 [ 48.000304] Kernel Offset: disabled [ 48.004008] Rebooting in 86400 seconds..