[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 56.524257][ T26] audit: type=1800 audit(1574329285.606:25): pid=8740 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.569514][ T26] audit: type=1800 audit(1574329285.606:26): pid=8740 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.619321][ T26] audit: type=1800 audit(1574329285.616:27): pid=8740 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 '10.128.1.59' (ECDSA) to the list of known hosts. 2019/11/21 09:41:35 fuzzer started 2019/11/21 09:41:37 connecting to host at 10.128.0.26:36551 2019/11/21 09:41:37 checking machine... 2019/11/21 09:41:37 checking revisions... 2019/11/21 09:41:37 testing simple program... syzkaller login: [ 68.175889][ T8908] IPVS: ftp: loaded support on port[0] = 21 2019/11/21 09:41:37 building call list... [ 68.566491][ T21] kasan: CONFIG_KASAN_INLINE enabled [ 68.572160][ T21] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 68.581961][ T21] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 68.588912][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.4.0-rc7-syzkaller #0 [ 68.597143][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.607201][ T21] Workqueue: netns cleanup_net [ 68.611962][ T21] RIP: 0010:kernfs_find_ns+0x36/0x380 [ 68.617340][ T21] Code: 55 41 54 49 89 fc 53 48 83 ec 10 48 89 75 d0 e8 d0 7d 94 ff 49 8d 7c 24 68 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 24 03 00 00 49 8d bc 24 90 00 00 00 49 8b 5c 24 [ 68.636937][ T21] RSP: 0018:ffff8880a9a1f898 EFLAGS: 00010202 [ 68.642999][ T21] RAX: dffffc0000000000 RBX: ffffffff8848f7a0 RCX: 0000000000000000 [ 68.650960][ T21] RDX: 000000000000000d RSI: ffffffff81deda20 RDI: 0000000000000068 [ 68.658921][ T21] RBP: ffff8880a9a1f8d0 R08: 1ffffffff1214718 R09: fffffbfff1214719 [ 68.666887][ T21] R10: ffff8880a9a1f8d0 R11: ffffffff890a38c7 R12: 0000000000000000 [ 68.674848][ T21] R13: ffffffff8848f760 R14: 0000000000000000 R15: 0000000000000000 [ 68.682821][ T21] FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 68.691746][ T21] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 68.698334][ T21] CR2: ffffffffff600400 CR3: 000000009c860000 CR4: 00000000001406f0 [ 68.706317][ T21] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 68.714451][ T21] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 68.722416][ T21] Call Trace: [ 68.725704][ T21] kernfs_find_and_get_ns+0x34/0x70 [ 68.730894][ T21] sysfs_remove_group+0x76/0x1b0 [ 68.735829][ T21] netdev_queue_update_kobjects+0x261/0x3e0 [ 68.741718][ T21] netdev_unregister_kobject+0x15e/0x1f0 [ 68.747397][ T21] rollback_registered_many+0x7c6/0xfc0 [ 68.752954][ T21] ? generic_xdp_install+0x4a0/0x4a0 [ 68.758232][ T21] ? find_held_lock+0x35/0x130 [ 68.762988][ T21] ? ip6gre_exit_batch_net+0x1f6/0x760 [ 68.768455][ T21] unregister_netdevice_many.part.0+0x1b/0x1f0 [ 68.774604][ T21] unregister_netdevice_many+0x3b/0x50 [ 68.780054][ T21] ip6gre_exit_batch_net+0x541/0x760 [ 68.785332][ T21] ? ip6gre_tunnel_link+0x100/0x100 [ 68.790542][ T21] ? ip6gre_tunnel_link+0x100/0x100 [ 68.795738][ T21] ops_exit_list.isra.0+0x10c/0x160 [ 68.800930][ T21] cleanup_net+0x538/0xaf0 [ 68.805349][ T21] ? netns_install+0x1d0/0x1d0 [ 68.810111][ T21] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 68.815652][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 68.821622][ T21] ? trace_hardirqs_on+0x67/0x240 [ 68.826655][ T21] process_one_work+0x9af/0x1740 [ 68.831635][ T21] ? pwq_dec_nr_in_flight+0x320/0x320 [ 68.837020][ T21] ? lock_acquire+0x190/0x410 [ 68.841696][ T21] worker_thread+0x98/0xe40 [ 68.846199][ T21] kthread+0x361/0x430 [ 68.850263][ T21] ? process_one_work+0x1740/0x1740 [ 68.855454][ T21] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 68.861166][ T21] ret_from_fork+0x24/0x30 [ 68.865589][ T21] Modules linked in: [ 68.876390][ T21] ---[ end trace 87b8c550f4470ccc ]--- [ 68.881897][ T21] RIP: 0010:kernfs_find_ns+0x36/0x380 [ 68.887560][ T21] Code: 55 41 54 49 89 fc 53 48 83 ec 10 48 89 75 d0 e8 d0 7d 94 ff 49 8d 7c 24 68 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 24 03 00 00 49 8d bc 24 90 00 00 00 49 8b 5c 24 [ 68.907431][ T21] RSP: 0018:ffff8880a9a1f898 EFLAGS: 00010202 [ 68.913711][ T21] RAX: dffffc0000000000 RBX: ffffffff8848f7a0 RCX: 0000000000000000 [ 68.921679][ T21] RDX: 000000000000000d RSI: ffffffff81deda20 RDI: 0000000000000068 [ 68.930026][ T21] RBP: ffff8880a9a1f8d0 R08: 1ffffffff1214718 R09: fffffbfff1214719 [ 68.938268][ T21] R10: ffff8880a9a1f8d0 R11: ffffffff890a38c7 R12: 0000000000000000 [ 68.946449][ T21] R13: ffffffff8848f760 R14: 0000000000000000 R15: 0000000000000000 [ 68.954662][ T21] FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 68.963816][ T21] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 68.970394][ T21] CR2: 000000c420e00000 CR3: 000000009c860000 CR4: 00000000001406e0 [ 68.978638][ T21] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 68.986803][ T21] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 68.995005][ T21] Kernel panic - not syncing: Fatal exception [ 69.002422][ T21] Kernel Offset: disabled [ 69.006753][ T21] Rebooting in 86400 seconds..