INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.0.52' (ECDSA) to the list of known hosts. net.ipv6.conf.syz_tun.accept_dad = 0 net.ipv6.conf.syz_tun.router_solicitations = 0 RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported syzkaller login: [ 36.818343] ip (3620) used greatest stack depth: 54544 bytes left [ 36.875781] bridge0: port 1(bridge_slave_0) entered blocking state [ 36.882387] bridge0: port 1(bridge_slave_0) entered disabled state [ 36.889939] device bridge_slave_0 entered promiscuous mode [ 36.913395] bridge0: port 2(bridge_slave_1) entered blocking state [ 36.920187] bridge0: port 2(bridge_slave_1) entered disabled state [ 36.927868] device bridge_slave_1 entered promiscuous mode [ 36.951542] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 36.985520] 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 [ 37.107412] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 37.130601] 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 [ 37.255325] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 37.279160] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 37.305577] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 37.332977] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready RTNETLINK answers: Operation not supported Cannot find device "vcan0" [ 37.546593] bridge0: port 2(bridge_slave_1) entered blocking state [ 37.553184] bridge0: port 2(bridge_slave_1) entered forwarding state [ 37.560193] bridge0: port 1(bridge_slave_0) entered blocking state [ 37.566767] bridge0: port 1(bridge_slave_0) entered forwarding state Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "tunl0" Cannot find device "tunl0" Cannot find device "tunl0" Cannot find device "tunl0" 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" [ 39.117138] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready Cannot find device "team0" [ 39.190233] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 39.196605] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 39.204574] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready Cannot find device "team0" Cannot find device "team0" Cannot find device "team0" executing program [ 39.789120] ================================================================== [ 39.790060] BUG: KMSAN: uninit-value in copy_page_to_iter+0x754/0x1b70 [ 39.790060] CPU: 1 PID: 3958 Comm: syzkaller707580 Not tainted 4.16.0+ #84 [ 39.790060] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.790060] Call Trace: [ 39.790060] dump_stack+0x185/0x1d0 [ 39.790060] ? kmsan_internal_check_memory+0x155/0x1e0 [ 39.790060] kmsan_report+0x142/0x240 [ 39.790060] kmsan_internal_check_memory+0x174/0x1e0 [ 39.790060] kmsan_copy_to_user+0x69/0x160 [ 39.790060] copy_page_to_iter+0x754/0x1b70 [ 39.790060] skb_copy_datagram_iter+0x7fd/0xf70 [ 39.790060] tun_do_read+0x2a29/0x30c0 [ 39.790060] ? arch_local_irq_disable+0x10/0x10 [ 39.790060] tun_chr_read_iter+0x21f/0x460 [ 39.790060] ? tun_cleanup+0x60/0x60 [ 39.790060] __vfs_read+0x6fb/0x8e0 [ 39.790060] vfs_read+0x36c/0x6c0 [ 39.790060] SYSC_read+0x172/0x360 [ 39.790060] SyS_read+0x55/0x80 [ 39.790060] do_syscall_64+0x309/0x430 [ 39.790060] ? vfs_write+0x8d0/0x8d0 [ 39.790060] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 39.790060] RIP: 0033:0x402300 [ 39.790060] RSP: 002b:00007ffed4751b48 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 39.790060] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000402300 [ 39.790060] RDX: 00000000000003e8 RSI: 00007ffed4751b50 RDI: 00000000000000fc [ 39.790060] RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000197b880 [ 39.790060] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000009b65 [ 39.790060] R13: 00000000006cf448 R14: 0000000000000000 R15: 0000000000000000 [ 39.790060] [ 39.790060] Uninit was created at: [ 39.790060] kmsan_alloc_meta_for_pages+0x161/0x3a0 [ 39.790060] kmsan_alloc_page+0x82/0xe0 [ 39.790060] __alloc_pages_nodemask+0xf5b/0x5dc0 [ 39.790060] alloc_pages_current+0x6b5/0x970 [ 39.790060] skb_page_frag_refill+0x3ba/0x5e0 [ 39.790060] sk_page_frag_refill+0xa4/0x340 [ 39.790060] __ip_append_data+0x107e/0x3d10 [ 39.790060] ip_append_data+0x2fb/0x440 [ 39.790060] udp_sendmsg+0x746/0x3180 [ 39.790060] inet_sendmsg+0x48d/0x740 [ 39.790060] sock_write_iter+0x3b9/0x470 [ 39.790060] __vfs_write+0x719/0x910 [ 39.790060] vfs_write+0x463/0x8d0 [ 39.790060] SYSC_write+0x172/0x360 [ 39.790060] SyS_write+0x55/0x80 [ 39.790060] do_syscall_64+0x309/0x430 [ 39.790060] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 39.790060] [ 39.790060] Bytes 0-957 of 958 are uninitialized [ 39.790060] ================================================================== [ 39.790060] Disabling lock debugging due to kernel taint [ 39.790060] Kernel panic - not syncing: panic_on_warn set ... [ 39.790060] [ 39.790060] CPU: 1 PID: 3958 Comm: syzkaller707580 Tainted: G B 4.16.0+ #84 [ 39.790060] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.790060] Call Trace: [ 39.790060] dump_stack+0x185/0x1d0 [ 39.790060] panic+0x39d/0x940 [ 39.790060] ? kmsan_internal_check_memory+0x155/0x1e0 [ 39.790060] kmsan_report+0x238/0x240 [ 39.790060] kmsan_internal_check_memory+0x174/0x1e0 [ 39.790060] kmsan_copy_to_user+0x69/0x160 [ 39.790060] copy_page_to_iter+0x754/0x1b70 [ 39.790060] skb_copy_datagram_iter+0x7fd/0xf70 [ 39.790060] tun_do_read+0x2a29/0x30c0 [ 39.790060] ? arch_local_irq_disable+0x10/0x10 [ 39.790060] tun_chr_read_iter+0x21f/0x460 [ 39.790060] ? tun_cleanup+0x60/0x60 [ 39.790060] __vfs_read+0x6fb/0x8e0 [ 39.790060] vfs_read+0x36c/0x6c0 [ 39.790060] SYSC_read+0x172/0x360 [ 39.790060] SyS_read+0x55/0x80 [ 39.790060] do_syscall_64+0x309/0x430 [ 39.790060] ? vfs_write+0x8d0/0x8d0 [ 39.790060] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 39.790060] RIP: 0033:0x402300 [ 39.790060] RSP: 002b:00007ffed4751b48 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 39.790060] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000402300 [ 39.790060] RDX: 00000000000003e8 RSI: 00007ffed4751b50 RDI: 00000000000000fc [ 39.790060] RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000197b880 [ 39.790060] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000009b65 [ 39.790060] R13: 00000000006cf448 R14: 0000000000000000 R15: 0000000000000000 [ 39.790060] Dumping ftrace buffer: [ 39.790060] (ftrace buffer empty) [ 39.790060] Kernel Offset: disabled [ 39.790060] Rebooting in 86400 seconds..