[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.477382] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.277494] random: sshd: uninitialized urandom read (32 bytes read) [ 21.689382] random: sshd: uninitialized urandom read (32 bytes read) [ 22.329241] random: sshd: uninitialized urandom read (32 bytes read) [ 23.573690] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts. [ 28.974328] random: sshd: uninitialized urandom read (32 bytes read) 2018/05/19 14:56:29 parsed 1 programs 2018/05/19 14:56:29 executed programs: 0 [ 29.426876] IPVS: Creating netns size=2536 id=1 [ 29.504993] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 29.515978] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 29.555961] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 29.566620] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 29.605621] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 29.616994] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 29.628089] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 29.640266] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 30.079543] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 30.102548] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 30.108658] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 30.115500] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 2018/05/19 14:56:30 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) [ 34.117203] IPVS: Creating netns size=2536 id=2 [ 34.183304] ================================================================== [ 34.190704] BUG: KASAN: use-after-free in xfrm6_tunnel_destroy+0x5b2/0x680 [ 34.197707] Read of size 8 at addr ffff8801c21ba8f8 by task kworker/0:2/3705 [ 34.199912] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 34.205464] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 34.218685] [ 34.220302] CPU: 0 PID: 3705 Comm: kworker/0:2 Not tainted 4.9.100-ge14d1a3 #28 [ 34.227731] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.237079] Workqueue: events xfrm_state_gc_task [ 34.241947] ffff8801c1ce7aa8 ffffffff81eb0f09 ffffea0007086e00 ffff8801c21ba8f8 [ 34.249983] 0000000000000000[ 34.252439] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 34.258098] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 34.266358] ffff8801c21ba8f8 ffff8801d8311784 ffff8801c1ce7ae0 [ 34.272810] ffffffff8156532b ffff8801c21ba8f8 0000000000000008 0000000000000000 [ 34.280846] Call Trace: [ 34.283422] [] dump_stack+0xc1/0x128 [ 34.288780] [] print_address_description+0x6c/0x234 [ 34.295433] [] kasan_report.cold.6+0x242/0x2fe [ 34.301657] [] ? xfrm6_tunnel_destroy+0x5b2/0x680 [ 34.305322] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 34.310999] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 34.317230] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 34.329378] [] __asan_report_load8_noabort+0x14/0x20 [ 34.336105] [] xfrm6_tunnel_destroy+0x5b2/0x680 [ 34.342391] [] ? xfrm6_tunnel_destroy+0x34/0x680 [ 34.348771] [] ? rcu_read_lock_sched_held+0x103/0x120 [ 34.355582] [] xfrm_state_gc_task+0x3ad/0x510 [ 34.361694] [] ? xfrm_state_unregister_afinfo+0x160/0x160 [ 34.368850] [] process_one_work+0x7e1/0x1500 [ 34.374877] [] ? process_one_work+0x728/0x1500 [ 34.381075] [] ? pwq_dec_nr_in_flight+0x2e0/0x2e0 [ 34.387538] [] worker_thread+0xd6/0x10a0 [ 34.393218] [] ? __schedule+0x655/0x1bd0 [ 34.398899] [] kthread+0x26d/0x300 [ 34.404064] [] ? process_one_work+0x1500/0x1500 [ 34.410351] [] ? kthread_park+0xa0/0xa0 [ 34.415943] [] ? kthread_park+0xa0/0xa0 [ 34.421533] [] ? kthread_park+0xa0/0xa0 [ 34.427124] [] ret_from_fork+0x5c/0x70 [ 34.432626] [ 34.434224] Allocated by task 3685: [ 34.437822] save_stack_trace+0x16/0x20 [ 34.441763] save_stack+0x43/0xd0 [ 34.445182] kasan_kmalloc+0xc7/0xe0 [ 34.448867] __kmalloc+0x11d/0x300 [ 34.452384] ops_init+0xeb/0x380 [ 34.455720] setup_net+0x1b9/0x3f0 [ 34.459237] copy_net_ns+0x189/0x290 [ 34.462919] create_new_namespaces+0x51c/0x730 [ 34.467471] unshare_nsproxy_namespaces+0xa5/0x1d0 [ 34.472369] SyS_unshare+0x319/0x710 [ 34.476054] do_syscall_64+0x1a6/0x490 [ 34.479909] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 34.484976] [ 34.486572] Freed by task 1619: [ 34.489819] save_stack_trace+0x16/0x20 [ 34.493764] save_stack+0x43/0xd0 [ 34.497187] kasan_slab_free+0x72/0xc0 [ 34.501041] kfree+0xfb/0x310 [ 34.504115] ops_free_list.part.10+0x1ff/0x330 [ 34.508663] cleanup_net+0x3bf/0x630 [ 34.512345] process_one_work+0x7e1/0x1500 [ 34.516548] worker_thread+0xd6/0x10a0 [ 34.520404] kthread+0x26d/0x300 [ 34.523742] ret_from_fork+0x5c/0x70 [ 34.527424] [ 34.529020] The buggy address belongs to the object at ffff8801c21ba100 [ 34.529020] which belongs to the cache kmalloc-8192 of size 8192 [ 34.541820] The buggy address is located 2040 bytes inside of [ 34.541820] 8192-byte region [ffff8801c21ba100, ffff8801c21bc100) [ 34.553833] The buggy address belongs to the page: [ 34.558731] page:ffffea0007086e00 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 [ 34.568904] flags: 0x8000000000004080(slab|head) [ 34.573625] page dumped because: kasan: bad access detected [ 34.579300] [ 34.580898] Memory state around the buggy address: [ 34.585797] ffff8801c21ba780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 34.593124] ffff8801c21ba800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 34.600453] >ffff8801c21ba880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 34.607779] ^ [ 34.615018] ffff8801c21ba900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 34.622345] ffff8801c21ba980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 34.629671] ================================================================== [ 34.636998] Disabling lock debugging due to kernel taint [ 34.642464] Kernel panic - not syncing: panic_on_warn set ... [ 34.642464] [ 34.649812] CPU: 0 PID: 3705 Comm: kworker/0:2 Tainted: G B 4.9.100-ge14d1a3 #28 [ 34.658442] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.667785] Workqueue: events xfrm_state_gc_task [ 34.672624] ffff8801c1ce7a08 ffffffff81eb0f09 ffffffff843c50e5 00000000ffffffff [ 34.680602] 0000000000000000 0000000000000000 ffff8801d8311784 ffff8801c1ce7ac8 [ 34.688574] ffffffff8141f895 0000000041b58ab3 ffffffff843b87e8 ffffffff8141f6d6 [ 34.696543] Call Trace: [ 34.699103] [] dump_stack+0xc1/0x128 [ 34.704437] [] panic+0x1bf/0x3bc [ 34.709421] [] ? add_taint.cold.6+0x16/0x16 [ 34.715363] [] kasan_end_report+0x47/0x4f [ 34.721141] [] kasan_report.cold.6+0x76/0x2fe [ 34.727255] [] ? xfrm6_tunnel_destroy+0x5b2/0x680 [ 34.733734] [] __asan_report_load8_noabort+0x14/0x20 [ 34.740459] [] xfrm6_tunnel_destroy+0x5b2/0x680 [ 34.746745] [] ? xfrm6_tunnel_destroy+0x34/0x680 [ 34.753123] [] ? rcu_read_lock_sched_held+0x103/0x120 [ 34.759933] [] xfrm_state_gc_task+0x3ad/0x510 [ 34.766048] [] ? xfrm_state_unregister_afinfo+0x160/0x160 [ 34.773207] [] process_one_work+0x7e1/0x1500 [ 34.779232] [] ? process_one_work+0x728/0x1500 [ 34.785444] [] ? pwq_dec_nr_in_flight+0x2e0/0x2e0 [ 34.791907] [] worker_thread+0xd6/0x10a0 [ 34.797589] [] ? __schedule+0x655/0x1bd0 [ 34.803267] [] kthread+0x26d/0x300 [ 34.808425] [] ? process_one_work+0x1500/0x1500 [ 34.814710] [] ? kthread_park+0xa0/0xa0 [ 34.820306] [] ? kthread_park+0xa0/0xa0 [ 34.825896] [] ? kthread_park+0xa0/0xa0 [ 34.831488] [] ret_from_fork+0x5c/0x70 [ 34.837478] Dumping ftrace buffer: [ 34.840987] (ftrace buffer empty) [ 34.844667] Kernel Offset: disabled [ 34.848265] Rebooting in 86400 seconds..