[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.294505] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.886506] random: sshd: uninitialized urandom read (32 bytes read) [ 23.308753] random: sshd: uninitialized urandom read (32 bytes read) [ 24.185739] random: sshd: uninitialized urandom read (32 bytes read) [ 31.197520] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts. [ 36.825590] random: sshd: uninitialized urandom read (32 bytes read) 2018/05/19 14:58:35 parsed 1 programs 2018/05/19 14:58:35 executed programs: 0 [ 37.267648] IPVS: Creating netns size=2536 id=1 [ 37.346482] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 37.357350] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 37.397571] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 37.408764] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 37.448924] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 37.460045] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 37.471332] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 37.491448] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 37.932562] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 37.954989] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 37.961070] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 37.968010] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 2018/05/19 14:58:36 result: failed=false hanged=false err=executor 0: failed: RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported Error: argument "bridge0" is wrong: Device does not exist Error: argument "bridge0" is wrong: Device does not exist Error: argument "bond0" is wrong: Device does not exist Error: argument "bond0" is wrong: Device does not exist Error: argument "team0" is wrong: Device does not exist Error: argument "team0" is wrong: Device does not exist RTNETLINK answers: Operation not supported Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" RTNETLINK answers: Operation not supported Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "team0" Cannot find device "team0" Cannot find device "team0" Cannot find device "team0" invalid command number 159 (errno 6) child failed (errno 6) loop failed (errno 0) RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported Error: argument "bridge0" is wrong: Device does not exist Error: argument "bridge0" is wrong: Device does not exist Error: argument "bond0" is wrong: Device does not exist Error: argument "bond0" is wrong: Device does not exist Error: argument "team0" is wrong: Device does not exist Error: argument "team0" is wrong: Device does not exist RTNETLINK answers: Operation not supported Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" RTNETLINK answers: Operation not supported Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "team0" Cannot find device "team0" Cannot find device "team0" Cannot find device "team0" invalid command number 159 (errno 6) child failed (errno 6) loop failed (errno 0) [ 41.506009] IPVS: Creating netns size=2536 id=2 [ 41.542202] ================================================================== [ 41.549569] BUG: KASAN: use-after-free in xfrm6_tunnel_destroy+0x5b2/0x680 [ 41.556555] Read of size 8 at addr ffff8801bc9407f8 by task kworker/0:2/1837 [ 41.563708] [ 41.565309] CPU: 0 PID: 1837 Comm: kworker/0:2 Not tainted 4.9.100-ge14d1a3 #31 [ 41.572724] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.582052] Workqueue: events xfrm_state_gc_task [ 41.586918] ffff8801ce0dfaa8 ffffffff81eb0f09 ffffea0006f25000 ffff8801bc9407f8 [ 41.594891] 0000000000000000 ffff8801bc9407f8 ffff8801d7e70a04 ffff8801ce0dfae0 [ 41.602861] ffffffff8156532b ffff8801bc9407f8 0000000000000008 0000000000000000 [ 41.610827] Call Trace: [ 41.613387] [] dump_stack+0xc1/0x128 [ 41.618721] [] print_address_description+0x6c/0x234 [ 41.625356] [] kasan_report.cold.6+0x242/0x2fe [ 41.631561] [] ? xfrm6_tunnel_destroy+0x5b2/0x680 [ 41.638026] [] __asan_report_load8_noabort+0x14/0x20 [ 41.644750] [] xfrm6_tunnel_destroy+0x5b2/0x680 [ 41.651037] [] ? xfrm6_tunnel_destroy+0x34/0x680 [ 41.657413] [] ? rcu_read_lock_sched_held+0x103/0x120 [ 41.664222] [] xfrm_state_gc_task+0x3ad/0x510 [ 41.670338] [] ? xfrm_state_unregister_afinfo+0x160/0x160 [ 41.677497] [] process_one_work+0x7e1/0x1500 [ 41.683524] [] ? process_one_work+0x728/0x1500 [ 41.689725] [] ? pwq_dec_nr_in_flight+0x2e0/0x2e0 [ 41.696187] [] worker_thread+0xd6/0x10a0 [ 41.701869] [] ? __schedule+0x655/0x1bd0 [ 41.707549] [] kthread+0x26d/0x300 [ 41.712707] [] ? process_one_work+0x1500/0x1500 [ 41.718992] [] ? kthread_park+0xa0/0xa0 [ 41.724583] [] ? kthread_park+0xa0/0xa0 [ 41.730173] [] ? kthread_park+0xa0/0xa0 [ 41.735768] [] ret_from_fork+0x5c/0x70 [ 41.741270] [ 41.742868] Allocated by task 3826: [ 41.746466] save_stack_trace+0x16/0x20 [ 41.750406] save_stack+0x43/0xd0 [ 41.753826] kasan_kmalloc+0xc7/0xe0 [ 41.757506] __kmalloc+0x11d/0x300 [ 41.761013] ops_init+0xeb/0x380 [ 41.764345] setup_net+0x1b9/0x3f0 [ 41.767851] copy_net_ns+0x189/0x290 [ 41.771534] create_new_namespaces+0x51c/0x730 [ 41.776082] unshare_nsproxy_namespaces+0xa5/0x1d0 [ 41.780977] SyS_unshare+0x319/0x710 [ 41.784657] do_syscall_64+0x1a6/0x490 [ 41.788512] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 41.793581] [ 41.795175] Freed by task 47: [ 41.798249] save_stack_trace+0x16/0x20 [ 41.802192] save_stack+0x43/0xd0 [ 41.805611] kasan_slab_free+0x72/0xc0 [ 41.809467] kfree+0xfb/0x310 [ 41.812539] ops_free_list.part.10+0x1ff/0x330 [ 41.817086] cleanup_net+0x3bf/0x630 [ 41.820769] process_one_work+0x7e1/0x1500 [ 41.824972] worker_thread+0xd6/0x10a0 [ 41.828825] kthread+0x26d/0x300 [ 41.832156] ret_from_fork+0x5c/0x70 [ 41.835833] [ 41.837430] The buggy address belongs to the object at ffff8801bc940000 [ 41.837430] which belongs to the cache kmalloc-8192 of size 8192 [ 41.850226] The buggy address is located 2040 bytes inside of [ 41.850226] 8192-byte region [ffff8801bc940000, ffff8801bc942000) [ 41.862238] The buggy address belongs to the page: [ 41.867136] page:ffffea0006f25000 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 [ 41.877303] flags: 0x8000000000004080(slab|head) [ 41.882024] page dumped because: kasan: bad access detected [ 41.887700] [ 41.889296] Memory state around the buggy address: [ 41.894190] ffff8801bc940680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.901517] ffff8801bc940700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.908846] >ffff8801bc940780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.916175] ^ [ 41.923419] ffff8801bc940800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.930744] ffff8801bc940880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.938071] ================================================================== [ 41.945395] Disabling lock debugging due to kernel taint [ 41.950860] Kernel panic - not syncing: panic_on_warn set ... [ 41.950860] [ 41.958194] CPU: 0 PID: 1837 Comm: kworker/0:2 Tainted: G B 4.9.100-ge14d1a3 #31 [ 41.966823] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.976153] Workqueue: events xfrm_state_gc_task [ 41.980991] ffff8801ce0dfa08 ffffffff81eb0f09 ffffffff843c50e5 00000000ffffffff [ 41.988962] 0000000000000000 0000000000000000 ffff8801d7e70a04 ffff8801ce0dfac8 [ 41.996927] ffffffff8141f895 0000000041b58ab3 ffffffff843b87e8 ffffffff8141f6d6 [ 42.004889] Call Trace: [ 42.007444] [] dump_stack+0xc1/0x128 [ 42.012780] [] panic+0x1bf/0x3bc [ 42.017766] [] ? add_taint.cold.6+0x16/0x16 [ 42.023705] [] kasan_end_report+0x47/0x4f [ 42.029470] [] kasan_report.cold.6+0x76/0x2fe [ 42.035587] [] ? xfrm6_tunnel_destroy+0x5b2/0x680 [ 42.042051] [] __asan_report_load8_noabort+0x14/0x20 [ 42.048773] [] xfrm6_tunnel_destroy+0x5b2/0x680 [ 42.055058] [] ? xfrm6_tunnel_destroy+0x34/0x680 [ 42.061432] [] ? rcu_read_lock_sched_held+0x103/0x120 [ 42.068241] [] xfrm_state_gc_task+0x3ad/0x510 [ 42.074355] [] ? xfrm_state_unregister_afinfo+0x160/0x160 [ 42.081514] [] process_one_work+0x7e1/0x1500 [ 42.087543] [] ? process_one_work+0x728/0x1500 [ 42.093745] [] ? pwq_dec_nr_in_flight+0x2e0/0x2e0 [ 42.100206] [] worker_thread+0xd6/0x10a0 [ 42.105888] [] ? __schedule+0x655/0x1bd0 [ 42.111569] [] kthread+0x26d/0x300 [ 42.116728] [] ? process_one_work+0x1500/0x1500 [ 42.123019] [] ? kthread_park+0xa0/0xa0 [ 42.128612] [] ? kthread_park+0xa0/0xa0 [ 42.134201] [] ? kthread_park+0xa0/0xa0 [ 42.139794] [] ret_from_fork+0x5c/0x70 [ 42.145647] Dumping ftrace buffer: [ 42.149158] (ftrace buffer empty) [ 42.152840] Kernel Offset: disabled [ 42.156438] Rebooting in 86400 seconds..