[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 55.459325][ T26] audit: type=1800 audit(1574329284.569:25): pid=8727 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 55.501200][ T26] audit: type=1800 audit(1574329284.569:26): pid=8727 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 55.528414][ T26] audit: type=1800 audit(1574329284.569:27): pid=8727 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 '10.128.0.241' (ECDSA) to the list of known hosts. 2019/11/21 09:41:34 fuzzer started 2019/11/21 09:41:37 connecting to host at 10.128.0.26:32923 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: [ 68.108736][ T8894] IPVS: ftp: loaded support on port[0] = 21 2019/11/21 09:41:37 building call list... [ 68.514289][ T45] kasan: CONFIG_KASAN_INLINE enabled [ 68.519872][ T45] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 68.528275][ T45] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 68.535213][ T45] CPU: 1 PID: 45 Comm: kworker/u4:2 Not tainted 5.4.0-rc7-syzkaller #0 [ 68.543439][ T45] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.553493][ T45] Workqueue: netns cleanup_net [ 68.558256][ T45] RIP: 0010:kernfs_find_ns+0x36/0x380 [ 68.563622][ T45] 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 [ 68.583217][ T45] RSP: 0018:ffff8880a9af7898 EFLAGS: 00010202 [ 68.589273][ T45] RAX: dffffc0000000000 RBX: ffffffff8848f7a0 RCX: 0000000000000000 [ 68.597235][ T45] RDX: 000000000000000d RSI: ffffffff81deda20 RDI: 0000000000000068 [ 68.605196][ T45] RBP: ffff8880a9af78d0 R08: 1ffffffff1214718 R09: fffffbfff1214719 [ 68.613333][ T45] R10: ffff8880a9af78d0 R11: ffffffff890a38c7 R12: 0000000000000000 [ 68.621293][ T45] R13: ffffffff8848f760 R14: 0000000000000000 R15: 0000000000000000 [ 68.629284][ T45] FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 68.638205][ T45] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 68.644778][ T45] CR2: ffffffffff600400 CR3: 00000000a87ea000 CR4: 00000000001406e0 [ 68.652740][ T45] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 68.660702][ T45] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 68.668663][ T45] Call Trace: [ 68.674036][ T45] kernfs_find_and_get_ns+0x34/0x70 [ 68.679224][ T45] sysfs_remove_group+0x76/0x1b0 [ 68.684676][ T45] netdev_queue_update_kobjects+0x261/0x3e0 [ 68.690567][ T45] netdev_unregister_kobject+0x15e/0x1f0 [ 68.696227][ T45] rollback_registered_many+0x7c6/0xfc0 [ 68.701768][ T45] ? generic_xdp_install+0x4a0/0x4a0 [ 68.707045][ T45] ? find_held_lock+0x35/0x130 [ 68.711800][ T45] ? ip6gre_exit_batch_net+0x1f6/0x760 [ 68.717259][ T45] unregister_netdevice_many.part.0+0x1b/0x1f0 [ 68.723407][ T45] unregister_netdevice_many+0x3b/0x50 [ 68.728859][ T45] ip6gre_exit_batch_net+0x541/0x760 [ 68.734138][ T45] ? ip6gre_tunnel_link+0x100/0x100 [ 68.739346][ T45] ? ip6gre_tunnel_link+0x100/0x100 [ 68.744538][ T45] ops_exit_list.isra.0+0x10c/0x160 [ 68.749727][ T45] cleanup_net+0x538/0xaf0 [ 68.754140][ T45] ? netns_install+0x1d0/0x1d0 [ 68.758897][ T45] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 68.764434][ T45] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 68.770405][ T45] ? trace_hardirqs_on+0x67/0x240 [ 68.775429][ T45] process_one_work+0x9af/0x1740 [ 68.780366][ T45] ? pwq_dec_nr_in_flight+0x320/0x320 [ 68.785726][ T45] ? lock_acquire+0x190/0x410 [ 68.790403][ T45] worker_thread+0x98/0xe40 [ 68.794896][ T45] ? trace_hardirqs_on+0x67/0x240 [ 68.799920][ T45] kthread+0x361/0x430 [ 68.803983][ T45] ? process_one_work+0x1740/0x1740 [ 68.809170][ T45] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 68.814879][ T45] ret_from_fork+0x24/0x30 [ 68.819285][ T45] Modules linked in: [ 68.830433][ T45] ---[ end trace c99d985187cce751 ]--- [ 68.836128][ T45] RIP: 0010:kernfs_find_ns+0x36/0x380 [ 68.841677][ T45] 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 [ 68.861429][ T45] RSP: 0018:ffff8880a9af7898 EFLAGS: 00010202 [ 68.867495][ T45] RAX: dffffc0000000000 RBX: ffffffff8848f7a0 RCX: 0000000000000000 [ 68.875606][ T45] RDX: 000000000000000d RSI: ffffffff81deda20 RDI: 0000000000000068 [ 68.883711][ T45] RBP: ffff8880a9af78d0 R08: 1ffffffff1214718 R09: fffffbfff1214719 [ 68.891794][ T45] R10: ffff8880a9af78d0 R11: ffffffff890a38c7 R12: 0000000000000000 [ 68.899783][ T45] R13: ffffffff8848f760 R14: 0000000000000000 R15: 0000000000000000 [ 68.907901][ T45] FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 68.916916][ T45] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 68.923632][ T45] CR2: ffffffffff600400 CR3: 000000009580a000 CR4: 00000000001406e0 [ 68.931695][ T45] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 68.939704][ T45] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 68.947811][ T45] Kernel panic - not syncing: Fatal exception [ 68.955155][ T45] Kernel Offset: disabled [ 68.959484][ T45] Rebooting in 86400 seconds..