[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 56.631477][ T26] audit: type=1800 audit(1574329285.667:25): pid=8763 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.670568][ T26] audit: type=1800 audit(1574329285.667:26): pid=8763 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.729048][ T26] audit: type=1800 audit(1574329285.667:27): pid=8763 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 '10.128.0.182' (ECDSA) to the list of known hosts. 2019/11/21 09:41:37 fuzzer started 2019/11/21 09:41:38 connecting to host at 10.128.0.26:45259 2019/11/21 09:41:38 checking machine... 2019/11/21 09:41:38 checking revisions... 2019/11/21 09:41:38 testing simple program... syzkaller login: [ 69.814109][ T8930] IPVS: ftp: loaded support on port[0] = 21 2019/11/21 09:41:38 building call list... [ 70.213890][ T7] kasan: CONFIG_KASAN_INLINE enabled [ 70.219337][ T7] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 70.228051][ T7] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 70.235003][ T7] CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 5.4.0-rc7-syzkaller #0 [ 70.243154][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.253227][ T7] Workqueue: netns cleanup_net [ 70.258008][ T7] RIP: 0010:kernfs_find_ns+0x36/0x380 [ 70.263373][ T7] 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 [ 70.282966][ T7] RSP: 0018:ffff8880a9897898 EFLAGS: 00010202 [ 70.289047][ T7] RAX: dffffc0000000000 RBX: ffffffff8848f7a0 RCX: 0000000000000000 [ 70.297019][ T7] RDX: 000000000000000d RSI: ffffffff81deda20 RDI: 0000000000000068 [ 70.304985][ T7] RBP: ffff8880a98978d0 R08: 1ffffffff1214718 R09: fffffbfff1214719 [ 70.312965][ T7] R10: ffff8880a98978d0 R11: ffffffff890a38c7 R12: 0000000000000000 [ 70.320952][ T7] R13: ffffffff8848f760 R14: 0000000000000000 R15: 0000000000000000 [ 70.328919][ T7] FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 70.337839][ T7] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 70.344425][ T7] CR2: 000000c420800000 CR3: 00000000a8dc9000 CR4: 00000000001406f0 [ 70.352404][ T7] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 70.360368][ T7] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 70.368334][ T7] Call Trace: [ 70.371629][ T7] kernfs_find_and_get_ns+0x34/0x70 [ 70.376844][ T7] sysfs_remove_group+0x76/0x1b0 [ 70.381799][ T7] netdev_queue_update_kobjects+0x261/0x3e0 [ 70.387693][ T7] netdev_unregister_kobject+0x15e/0x1f0 [ 70.393320][ T7] rollback_registered_many+0x7c6/0xfc0 [ 70.398861][ T7] ? generic_xdp_install+0x4a0/0x4a0 [ 70.404135][ T7] ? find_held_lock+0x35/0x130 [ 70.408891][ T7] ? ip6gre_exit_batch_net+0x1f6/0x760 [ 70.414353][ T7] unregister_netdevice_many.part.0+0x1b/0x1f0 [ 70.420502][ T7] unregister_netdevice_many+0x3b/0x50 [ 70.426994][ T7] ip6gre_exit_batch_net+0x541/0x760 [ 70.432273][ T7] ? ip6gre_tunnel_link+0x100/0x100 [ 70.437463][ T7] ? ip6gre_tunnel_link+0x100/0x100 [ 70.442669][ T7] ops_exit_list.isra.0+0x10c/0x160 [ 70.447864][ T7] cleanup_net+0x538/0xaf0 [ 70.452271][ T7] ? netns_install+0x1d0/0x1d0 [ 70.457051][ T7] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 70.462589][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 70.468594][ T7] ? trace_hardirqs_on+0x67/0x240 [ 70.473618][ T7] process_one_work+0x9af/0x1740 [ 70.478567][ T7] ? pwq_dec_nr_in_flight+0x320/0x320 [ 70.484190][ T7] ? lock_acquire+0x190/0x410 [ 70.488870][ T7] worker_thread+0x98/0xe40 [ 70.493373][ T7] kthread+0x361/0x430 [ 70.497436][ T7] ? process_one_work+0x1740/0x1740 [ 70.502627][ T7] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 70.508340][ T7] ret_from_fork+0x24/0x30 [ 70.512753][ T7] Modules linked in: [ 70.523263][ T7] ---[ end trace b94ff3c5954003d3 ]--- [ 70.528772][ T7] RIP: 0010:kernfs_find_ns+0x36/0x380 [ 70.534484][ T7] 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 [ 70.554276][ T7] RSP: 0018:ffff8880a9897898 EFLAGS: 00010202 [ 70.560444][ T7] RAX: dffffc0000000000 RBX: ffffffff8848f7a0 RCX: 0000000000000000 [ 70.568521][ T7] RDX: 000000000000000d RSI: ffffffff81deda20 RDI: 0000000000000068 [ 70.576628][ T7] RBP: ffff8880a98978d0 R08: 1ffffffff1214718 R09: fffffbfff1214719 [ 70.584748][ T7] R10: ffff8880a98978d0 R11: ffffffff890a38c7 R12: 0000000000000000 [ 70.592817][ T7] R13: ffffffff8848f760 R14: 0000000000000000 R15: 0000000000000000 [ 70.600931][ T7] FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 70.609860][ T7] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 70.616620][ T7] CR2: 000000c420800000 CR3: 00000000a7903000 CR4: 00000000001406f0 [ 70.624725][ T7] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 70.632832][ T7] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 70.640902][ T7] Kernel panic - not syncing: Fatal exception [ 70.647686][ T7] Kernel Offset: disabled [ 70.652020][ T7] Rebooting in 86400 seconds..