[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 40.477472] audit: type=1800 audit(1548252524.519:25): pid=7853 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 40.515918] audit: type=1800 audit(1548252524.519:26): pid=7853 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 40.556330] audit: type=1800 audit(1548252524.519:27): pid=7853 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 syzkaller login: [ 46.522364] sshd (7989) used greatest stack depth: 19848 bytes left Warning: Permanently added '10.128.0.186' (ECDSA) to the list of known hosts. [ 53.177288] IPVS: ftp: loaded support on port[0] = 21 [ 53.205267] IPVS: ftp: loaded support on port[0] = 21 [ 53.210858] IPVS: ftp: loaded support on port[0] = 21 [ 53.218779] IPVS: ftp: loaded support on port[0] = 21 [ 53.230460] IPVS: ftp: loaded support on port[0] = 21 [ 53.238138] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 54.198839] cgroup: fork rejected by pids controller in /syz5 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 54.271142] cgroup: fork rejected by pids controller in /syz2 executing program executing program executing program executing program executing program [ 54.322403] cgroup: fork rejected by pids controller in /syz1 [ 54.330237] cgroup: fork rejected by pids controller in /syz4 executing program executing program executing program executing program executing program [ 54.429186] cgroup: fork rejected by pids controller in /syz0 [ 54.446384] cgroup: fork rejected by pids controller in /syz3 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 55.808169] WARNING: CPU: 1 PID: 2620 at net/ipv6/xfrm6_tunnel.c:351 xfrm6_tunnel_net_exit+0x2cb/0x500 [ 55.817931] Kernel panic - not syncing: panic_on_warn set ... [ 55.823807] CPU: 1 PID: 2620 Comm: kworker/u4:4 Not tainted 5.0.0-rc3+ #40 [ 55.830803] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.840164] Workqueue: netns cleanup_net [ 55.844208] Call Trace: [ 55.846784] dump_stack+0x1db/0x2d0 [ 55.850400] ? dump_stack_print_info.cold+0x20/0x20 [ 55.855434] ? xfrm6_tunnel_net_exit+0x1e0/0x500 [ 55.860174] panic+0x2cb/0x65c [ 55.863347] ? add_taint.cold+0x16/0x16 [ 55.867322] ? xfrm6_tunnel_net_exit+0x2cb/0x500 [ 55.872082] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 55.877603] ? __probe_kernel_read+0x1f4/0x250 [ 55.882172] ? __warn.cold+0x5/0x48 [ 55.885780] ? __warn+0xe8/0x1d0 [ 55.889164] ? xfrm6_tunnel_net_exit+0x2cb/0x500 [ 55.893906] __warn.cold+0x20/0x48 [ 55.897439] ? xfrm6_tunnel_net_exit+0x2cb/0x500 [ 55.902236] report_bug+0x263/0x2b0 [ 55.905855] do_error_trap+0x11b/0x200 [ 55.909732] do_invalid_op+0x37/0x50 [ 55.913428] ? xfrm6_tunnel_net_exit+0x2cb/0x500 [ 55.918172] invalid_op+0x14/0x20 [ 55.921613] RIP: 0010:xfrm6_tunnel_net_exit+0x2cb/0x500 [ 55.926975] Code: 80 7d 00 00 4c 8b 3b 0f 85 f4 01 00 00 4d 89 7e 80 31 ff 4c 89 fe 41 c6 45 00 f8 e8 8f 28 a0 fa 4d 85 ff 74 92 e8 e5 26 a0 fa <0f> 0b eb 89 48 8b 9d 30 ff ff ff 49 8d 46 a0 45 31 e4 49 89 c5 48 [ 55.945903] RSP: 0018:ffff8880a0d37748 EFLAGS: 00010293 [ 55.951248] RAX: ffff8880a0e9c2c0 RBX: ffff88808d976138 RCX: ffffffff86e1d9e1 [ 55.958514] RDX: 0000000000000000 RSI: ffffffff86e1d9eb RDI: 0000000000000007 [ 55.965792] RBP: ffff8880a0d37828 R08: ffff8880a0e9c2c0 R09: ffff8880a0e9cbb0 [ 55.973142] R10: ffff8880a0e9c2c0 R11: 0000000000000000 R12: 00000000000000ff [ 55.980395] R13: ffffed10141a6ef0 R14: ffff8880a0d37800 R15: ffff88808dfbd780 [ 55.987674] ? xfrm6_tunnel_net_exit+0x2c1/0x500 [ 55.992414] ? xfrm6_tunnel_net_exit+0x2cb/0x500 [ 55.997156] ? xfrm6_tunnel_net_exit+0x2cb/0x500 [ 56.001895] ? xfrm6_tunnel_alloc_spi+0xc60/0xc60 [ 56.006745] ? xt_proto_init+0x850/0x850 [ 56.010806] ? calibrate_delay+0xd35/0x1056 [ 56.015111] ? inet_frag_destroy_rcu+0xf0/0xf0 [ 56.019774] ? xfrm6_tunnel_alloc_spi+0xc60/0xc60 [ 56.024604] ops_exit_list.isra.0+0xb0/0x160 [ 56.029005] cleanup_net+0x51d/0xb10 [ 56.032708] ? find_held_lock+0x35/0x120 [ 56.036755] ? netns_install+0x1d0/0x1d0 [ 56.040802] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 56.046325] ? check_preemption_disabled+0x48/0x290 [ 56.051327] ? __lock_is_held+0xb6/0x140 [ 56.055397] process_one_work+0xd0c/0x1ce0 [ 56.059616] ? preempt_notifier_register+0x200/0x200 [ 56.064711] ? __switch_to_asm+0x34/0x70 [ 56.068771] ? pwq_dec_nr_in_flight+0x4a0/0x4a0 [ 56.073423] ? __schedule+0x89f/0x1e60 [ 56.077299] ? pci_mmcfg_check_reserved+0x170/0x170 [ 56.082316] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 56.087058] ? worker_thread+0x3b7/0x14a0 [ 56.091229] ? find_held_lock+0x35/0x120 [ 56.095274] ? lock_acquire+0x1db/0x570 [ 56.099234] ? worker_thread+0x3cd/0x14a0 [ 56.103368] ? kasan_check_read+0x11/0x20 [ 56.107502] ? do_raw_spin_lock+0x156/0x360 [ 56.111803] ? lock_release+0xc40/0xc40 [ 56.115762] ? rwlock_bug.part.0+0x90/0x90 [ 56.119990] ? trace_hardirqs_on_caller+0x310/0x310 [ 56.125005] worker_thread+0x143/0x14a0 [ 56.128982] ? process_one_work+0x1ce0/0x1ce0 [ 56.133460] ? __kthread_parkme+0xc3/0x1b0 [ 56.137680] ? lock_acquire+0x1db/0x570 [ 56.141640] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 56.146729] ? lockdep_hardirqs_on+0x415/0x5d0 [ 56.151299] ? trace_hardirqs_on+0xbd/0x310 [ 56.155603] ? __kthread_parkme+0xc3/0x1b0 [ 56.159843] ? trace_hardirqs_off_caller+0x300/0x300 [ 56.164932] ? do_raw_spin_trylock+0x270/0x270 [ 56.169520] ? schedule+0x108/0x350 [ 56.173138] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 56.178238] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 56.183760] ? __kthread_parkme+0xfb/0x1b0 [ 56.187979] kthread+0x357/0x430 [ 56.191333] ? process_one_work+0x1ce0/0x1ce0 [ 56.195808] ? kthread_stop+0x920/0x920 [ 56.199774] ret_from_fork+0x3a/0x50 [ 56.204742] Kernel Offset: disabled [ 56.208468] Rebooting in 86400 seconds..