[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.187695] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.456537] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.783422] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.422863] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) [ 38.365776] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.10.13' (ECDSA) to the list of known hosts. [ 43.825744] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) [ 43.940149] IPVS: Creating netns size=2552 id=1 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 [ 44.110649] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 44.124745] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready Error: argument "bond0" is wrong: Device does not exist Error: argument "bond0" is wrong: Device does not exist [ 44.205645] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 44.219867] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready Error: argument "team0" is wrong: Device does not exist Error: argument "team0" is wrong: Device does not exist [ 44.298388] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 44.312781] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 44.329690] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 44.345173] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready 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" RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument 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" [ 45.065600] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 45.104439] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready Cannot find device "team0" Cannot find device "team0" executing program executing program [ 45.382512] syz-executor350 (4046) used greatest stack depth: 23552 bytes left [ 45.388295] ================================================================== [ 45.388308] BUG: KASAN: slab-out-of-bounds in ip6_tnl_xmit2+0x2043/0x20d0 [ 45.388314] Read of size 16 at addr ffff8801d84a2b30 by task syz-executor350/4047 [ 45.388315] [ 45.388322] CPU: 1 PID: 4047 Comm: syz-executor350 Not tainted 4.4.147-ga5fc665 #80 [ 45.388326] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.388336] 0000000000000000 6be34894c98f9875 ffff8801d8adeaf0 ffffffff81e12a4d [ 45.388344] ffffea0007612800 ffff8801d84a2b30 0000000000000000 ffff8801d84a2b38 [ 45.388353] ffff8800ba8c8000 ffff8801d8adeb28 ffffffff81517fd6 ffff8801d84a2b30 [ 45.388354] Call Trace: [ 45.388371] [] dump_stack+0xc1/0x124 [ 45.388379] [] print_address_description+0x6c/0x216 [ 45.388386] [] kasan_report.cold.7+0x175/0x2f7 [ 45.388393] [] ? ip6_tnl_xmit2+0x2043/0x20d0 [ 45.388401] [] __asan_report_load_n_noabort+0xf/0x20 [ 45.388407] [] ip6_tnl_xmit2+0x2043/0x20d0 [ 45.388416] [] ? selinux_parse_skb.constprop.64+0x53a/0x19a0 [ 45.388423] [] ? ip6ip6_err+0x530/0x530 [ 45.388441] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 45.388458] [] ? make_kuid+0xf0/0x180 [ 45.388464] [] ip6_tnl_xmit+0x910/0xc60 [ 45.388484] [] ? ip6_tnl_xmit2+0x20d0/0x20d0 [ 45.388505] [] ? debug_check_no_locks_freed+0x210/0x210 [ 45.388513] [] ? debug_check_no_locks_freed+0x210/0x210 [ 45.388524] [] dev_hard_start_xmit+0x7b1/0x11c0 [ 45.388546] [] __dev_queue_xmit+0x16c0/0x1c80 [ 45.388554] [] ? __dev_queue_xmit+0x1d7/0x1c80 [ 45.388562] [] ? debug_check_no_locks_freed+0x210/0x210 [ 45.388581] [] ? netdev_pick_tx+0x2c0/0x2c0 [ 45.388590] [] ? ctnetlink_expect_event+0x770/0x770 [ 45.388598] [] ? check_preemption_disabled+0x3b/0x170 [ 45.388605] [] dev_queue_xmit+0x17/0x20 [ 45.388612] [] neigh_direct_output+0x15/0x20 [ 45.388620] [] ip_finish_output2+0x6ab/0x1110 [ 45.388626] [] ? ip_finish_output2+0x212/0x1110 [ 45.388633] [] ? nf_ct_deliver_cached_events+0x335/0x560 [ 45.388651] [] ? nf_ct_deliver_cached_events+0x83/0x560 [ 45.388670] [] ? ip_copy_metadata+0x830/0x830 [ 45.388677] [] ? ip_options_fragment+0x1ac/0x280 [ 45.388684] [] ip_do_fragment+0x19cc/0x2190 [ 45.388691] [] ? ip_copy_metadata+0x830/0x830 [ 45.388699] [] ip_fragment.constprop.51+0x143/0x200 [ 45.388706] [] ip_finish_output+0x48a/0xc00 [ 45.388713] [] ip_output+0x219/0x4c0 [ 45.388720] [] ? ip_mc_output+0x980/0x980 [ 45.388727] [] ? ip_fragment.constprop.51+0x200/0x200 [ 45.388734] [] ? __ip_make_skb+0xe59/0x16a0 [ 45.388741] [] ip_local_out+0x9b/0x180 [ 45.388747] [] ip_send_skb+0x3c/0xc0 [ 45.388754] [] udp_send_skb+0x5c3/0xc60 [ 45.388761] [] udp_push_pending_frames+0x4e/0xe0 [ 45.388767] [] udp_sendmsg+0x1147/0x1c70 [ 45.388774] [] ? ip_reply_glue_bits+0xc0/0xc0 [ 45.388781] [] ? ip_reply_glue_bits+0xc0/0xc0 [ 45.388788] [] ? udp4_lib_lookup+0x60/0x60 [ 45.388795] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 45.388803] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 45.388811] [] ? release_sock+0x3b6/0x500 [ 45.388818] [] ? trace_hardirqs_on+0xd/0x10 [ 45.388838] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 45.388846] [] ? _raw_spin_unlock_bh+0x30/0x40 [ 45.388854] [] ? __lock_acquire+0xa86/0x5270 [ 45.388860] [] ? dst_release+0x70/0xb0 [ 45.388867] [] udpv6_sendmsg+0x1d59/0x24c0 [ 45.388875] [] ? debug_check_no_locks_freed+0x210/0x210 [ 45.388893] [] ? udp4_lib_lookup+0x60/0x60 [ 45.388899] [] ? __local_bh_enable_ip+0x40/0xd0 [ 45.388906] [] ? udp6_lib_lookup2+0x990/0x990 [ 45.388914] [] ? debug_check_no_locks_freed+0x210/0x210 [ 45.388920] [] ? sock_has_perm+0x1c1/0x400 [ 45.388927] [] ? sock_has_perm+0x29f/0x400 [ 45.388933] [] ? sock_has_perm+0x9f/0x400 [ 45.388942] [] ? inet_sendmsg+0x143/0x4d0 [ 45.388949] [] inet_sendmsg+0x203/0x4d0 [ 45.388956] [] ? inet_sendmsg+0x73/0x4d0 [ 45.388969] [] ? inet_recvmsg+0x4c0/0x4c0 [ 45.388977] [] sock_sendmsg+0xcc/0x110 [ 45.388984] [] ___sys_sendmsg+0x441/0x880 [ 45.389003] [] ? debug_check_no_locks_freed+0x210/0x210 [ 45.389010] [] ? copy_msghdr_from_user+0x550/0x550 [ 45.389016] [] ? sock_has_perm+0x29f/0x400 [ 45.389022] [] ? sock_has_perm+0x9f/0x400 [ 45.389030] [] ? inet_sendmsg+0x143/0x4d0 [ 45.389036] [] ? inet_sendmsg+0x20a/0x4d0 [ 45.389043] [] ? inet_sendmsg+0x73/0x4d0 [ 45.389049] [] ? inet_recvmsg+0x4c0/0x4c0 [ 45.389056] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 45.389063] [] ? __fget_light+0x9f/0x1f0 [ 45.389069] [] ? __fdget+0x18/0x20 [ 45.389076] [] __sys_sendmmsg+0x12e/0x2e0 [ 45.389083] [] ? SyS_sendmsg+0x50/0x50 [ 45.389089] [] ? ip6_datagram_connect+0x3a/0x50 [ 45.389097] [] ? inet_dgram_connect+0x11e/0x200 [ 45.389103] [] ? SYSC_connect+0x22a/0x300 [ 45.389112] [] ? vmacache_update+0xfe/0x130 [ 45.389119] [] ? __do_page_fault+0x38a/0xa10 [ 45.389126] [] ? retint_user+0x18/0x3c [ 45.389145] [] SyS_sendmmsg+0x35/0x60 [ 45.389152] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 45.389154] [ 45.389157] Allocated by task 4047: [ 45.389167] [] save_stack_trace+0x26/0x50 [ 45.389174] [] save_stack+0x43/0xd0 [ 45.389181] [] kasan_kmalloc+0xc7/0xe0 [ 45.389187] [] __kmalloc+0x124/0x310 [ 45.389195] [] __neigh_create+0x1d6/0x1b20 [ 45.389202] [] ipv4_neigh_lookup+0x4dd/0x700 [ 45.389209] [] ip6_tnl_xmit2+0x613/0x20d0 [ 45.389216] [] ip6_tnl_xmit+0x910/0xc60 [ 45.389224] [] dev_hard_start_xmit+0x7b1/0x11c0 [ 45.389232] [] __dev_queue_xmit+0x16c0/0x1c80 [ 45.389239] [] dev_queue_xmit+0x17/0x20 [ 45.389246] [] neigh_direct_output+0x15/0x20 [ 45.389253] [] ip_finish_output2+0x6ab/0x1110 [ 45.389260] [] ip_do_fragment+0x19cc/0x2190 [ 45.389268] [] ip_fragment.constprop.51+0x143/0x200 [ 45.389274] [] ip_finish_output+0x48a/0xc00 [ 45.389281] [] ip_output+0x219/0x4c0 [ 45.389288] [] ip_local_out+0x9b/0x180 [ 45.389295] [] ip_send_skb+0x3c/0xc0 [ 45.389301] [] udp_send_skb+0x5c3/0xc60 [ 45.389308] [] udp_push_pending_frames+0x4e/0xe0 [ 45.389315] [] udp_sendmsg+0x1147/0x1c70 [ 45.389322] [] udpv6_sendmsg+0x1d59/0x24c0 [ 45.389329] [] inet_sendmsg+0x203/0x4d0 [ 45.389336] [] sock_sendmsg+0xcc/0x110 [ 45.389343] [] ___sys_sendmsg+0x441/0x880 [ 45.389351] [] __sys_sendmmsg+0x12e/0x2e0 [ 45.389358] [] SyS_sendmmsg+0x35/0x60 [ 45.389366] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 45.389367] [ 45.389369] Freed by task 0: [ 45.389371] (stack is not available) [ 45.389372] [ 45.389376] The buggy address belongs to the object at ffff8801d84a2880 [ 45.389376] which belongs to the cache kmalloc-1024 of size 1024 [ 45.389382] The buggy address is located 688 bytes inside of [ 45.389382] 1024-byte region [ffff8801d84a2880, ffff8801d84a2c80) [ 45.389383] The buggy address belongs to the page: [ 45.454290] kasan: CONFIG_KASAN_INLINE enabled [ 45.454298] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 45.454303] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 45.454308] Dumping ftrace buffer: [ 45.454311] (ftrace buffer empty) [ 45.454314] Modules linked in: [ 45.454320] CPU: 0 PID: 4046 Comm: syz-executor350 Not tainted 4.4.147-ga5fc665 #80 [ 45.454324] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.454328] task: ffff8800bb899800 task.stack: ffff8800b1578000 [ 45.454344] RIP: 0010:[] [] debug_object_deactivate+0x191/0x340 [ 45.454348] RSP: 0018:ffff8801db207cf0 EFLAGS: 00010803 [ 45.454352] RAX: dffffc0000000000 RBX: c8cfe8df89480b0f RCX: 1919fd1bf1290164 [ 45.454356] RDX: 1ffffffff0b4070f RSI: ffffffff844c77a0 RDI: c8cfe8df89480b27 [ 45.454359] RBP: ffff8801db207da8 R08: 0000000000000001 R09: 0000000000000000 [ 45.454362] R10: ffffed0043fffa01 R11: 0000000000000001 R12: 1ffff1003b640fa0 [ 45.454366] R13: ffffffff85a03868 R14: ffff8801d99b7638 R15: 0000000000000003 [ 45.454371] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 45.454375] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.454378] CR2: 0000000000415830 CR3: 000000000440c000 CR4: 00000000001606f0 [ 45.454383] Stack: [ 45.454391] 0000000000000092 ffffffff844c77a0 0000000041b58ab3 ffffffff8420c107 [ 45.454398] ffffffff81e74350 0000000a19a8b670 ffff8801db207d30 ffffffff810cdef3 [ 45.454405] ffff8801db207d40 ffffffff810cdf19 ffff8801db207da8 ffffffff812b2381 [ 45.454407] Call Trace: [ 45.454418] [ 45.454418] [] ? debug_object_activate+0x480/0x480 [ 45.454427] [] ? kvm_clock_read+0x23/0x40 [ 45.454445] [] ? kvm_clock_get_cycles+0x9/0x10 [ 45.454453] [] ? ktime_get+0x171/0x1e0 [ 45.454468] [] ? clockevents_program_event+0x1c5/0x3e0 [ 45.454475] [] __hrtimer_run_queues+0x222/0x1000 [ 45.454482] [] ? retrigger_next_event+0x1c0/0x1c0 [ 45.454488] [] ? kvm_clock_read+0x23/0x40 [ 45.454495] [] ? kvm_clock_get_cycles+0x9/0x10 [ 45.454501] [] ? hrtimer_interrupt+0x12d/0x430 [ 45.454507] [] hrtimer_interrupt+0x1b1/0x430 [ 45.454515] [] local_apic_timer_interrupt+0x74/0xa0 [ 45.454523] [] smp_apic_timer_interrupt+0x7c/0xa0 [ 45.454528] [] apic_timer_interrupt+0xa0/0xb0 [ 45.454537] [ 45.454538] [] ? console_unlock+0x659/0xa10 [ 45.454543] [] ? console_unlock+0x664/0xa10 [ 45.454549] [] vprintk_emit+0x51e/0x840 [ 45.454555] [] vprintk+0x28/0x30 [ 45.454560] [] vprintk_default+0x1d/0x30 [ 45.454568] [] printk+0xaf/0xd7 [ 45.454575] [] ? log_wakeup_reason.cold.1+0x13f/0x13f [ 45.454581] [] ? do_exit+0x183b/0x26b0 [ 45.454590] [] ? _raw_write_unlock_irq+0x27/0x50 [ 45.454597] [] do_exit.cold.21+0x5d/0x2bb [ 45.454604] [] ? release_task.part.17+0x1200/0x1200 [ 45.454613] [] ? __do_page_fault+0x38a/0xa10 [ 45.454620] [] ? retint_user+0x18/0x3c [ 45.454626] [] do_group_exit+0x111/0x330 [ 45.454634] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 45.454640] [] SyS_exit_group+0x1d/0x20 [ 45.454648] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 45.454754] Code: a9 01 00 00 48 8b 1b 41 bf 01 00 00 00 48 85 db 74 42 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 18 41 83 c7 01 48 89 f9 48 c1 e9 03 <80> 3c 01 00 0f 85 0c 01 00 00 4c 3b 73 18 74 7d 48 89 d9 48 c1 [ 45.454763] RIP [] debug_object_deactivate+0x191/0x340 [ 45.454765] RSP [ 45.454772] ---[ end trace d6501de20e797b19 ]--- [ 45.454776] Kernel panic - not syncing: Fatal exception in interrupt [ 46.613098] Shutting down cpus with NMI [ 46.613704] Dumping ftrace buffer: [ 46.613707] (ftrace buffer empty) [ 46.613709] Kernel Offset: disabled [ 47.768625] Rebooting in 86400 seconds..