[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 29.377579] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 34.712391] random: sshd: uninitialized urandom read (32 bytes read) [ 34.994403] random: sshd: uninitialized urandom read (32 bytes read) [ 36.137235] random: sshd: uninitialized urandom read (32 bytes read) [ 54.555387] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. [ 60.252334] random: sshd: uninitialized urandom read (32 bytes read) [ 60.362217] IPVS: ftp: loaded support on port[0] = 21 [ 60.511570] ip (4522) used greatest stack depth: 54328 bytes left [ 60.542251] bridge0: port 1(bridge_slave_0) entered blocking state [ 60.548662] bridge0: port 1(bridge_slave_0) entered disabled state [ 60.555840] device bridge_slave_0 entered promiscuous mode [ 60.579765] bridge0: port 2(bridge_slave_1) entered blocking state [ 60.586195] bridge0: port 2(bridge_slave_1) entered disabled state [ 60.593700] device bridge_slave_1 entered promiscuous mode [ 60.615557] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 60.636862] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 60.694735] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 60.719144] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 60.806254] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 60.813958] team0: Port device team_slave_0 added [ 60.834915] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 60.842210] team0: Port device team_slave_1 added [ 60.862080] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 60.883732] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 60.907092] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 60.931186] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 61.115182] bridge0: port 2(bridge_slave_1) entered blocking state [ 61.121649] bridge0: port 2(bridge_slave_1) entered forwarding state [ 61.128510] bridge0: port 1(bridge_slave_0) entered blocking state [ 61.134948] bridge0: port 1(bridge_slave_0) entered forwarding state RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported [ 61.264198] ip (4601) used greatest stack depth: 54120 bytes left RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument [ 61.856887] 8021q: adding VLAN 0 to HW filter on device bond0 [ 61.922401] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 61.985405] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 61.991621] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 61.999500] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 62.057474] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 62.444985] ================================================================== [ 62.453075] BUG: KMSAN: uninit-value in ip_tunnel_xmit+0x5dc/0x37c0 [ 62.459520] CPU: 1 PID: 4507 Comm: syz-executor679 Not tainted 4.17.0+ #9 [ 62.466426] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.475761] Call Trace: [ 62.478335] dump_stack+0x185/0x1d0 [ 62.481941] kmsan_report+0x188/0x2a0 [ 62.485722] __msan_warning_32+0x70/0xc0 [ 62.489781] ip_tunnel_xmit+0x5dc/0x37c0 [ 62.493817] ? skb_push+0x16b/0x260 [ 62.497438] ipgre_xmit+0xe16/0xef0 [ 62.501046] ? ipgre_close+0x230/0x230 [ 62.504924] dev_hard_start_xmit+0x5f6/0xc80 [ 62.509320] __dev_queue_xmit+0x2ad2/0x3540 [ 62.513705] ? packet_sendmsg+0x6672/0x8cc0 [ 62.518002] ? sock_alloc_send_pskb+0xff3/0x11a0 [ 62.522741] dev_queue_xmit+0x4b/0x60 [ 62.526517] ? __netdev_pick_tx+0xb50/0xb50 [ 62.530835] packet_sendmsg+0x818b/0x8cc0 [ 62.535002] ? kmsan_set_origin+0x9e/0x160 [ 62.539215] ? kmsan_internal_unpoison_shadow+0x83/0xe0 [ 62.544582] ? rw_copy_check_uvector+0x5af/0x6c0 [ 62.549327] ? __msan_metadata_ptr_for_store_8+0x13/0x20 [ 62.554757] ? copy_msghdr_from_user+0x72c/0x830 [ 62.559496] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 62.564838] ? compat_packet_setsockopt+0x360/0x360 [ 62.569844] ___sys_sendmsg+0xec8/0x1320 [ 62.573936] ? __fdget+0x4e/0x60 [ 62.577304] __x64_sys_sendmsg+0x331/0x460 [ 62.581553] ? ___sys_sendmsg+0x1320/0x1320 [ 62.585866] do_syscall_64+0x15b/0x230 [ 62.589740] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 62.594913] RIP: 0033:0x441179 [ 62.598185] RSP: 002b:00007ffd1fa252f8 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 62.605974] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441179 [ 62.613492] RDX: 0000000000000000 RSI: 0000000020001540 RDI: 0000000000000003 [ 62.620752] RBP: 00000000006cc018 R08: 0000000000000000 R09: 0000000000000000 [ 62.628190] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000402080 [ 62.635457] R13: 0000000000402110 R14: 0000000000000000 R15: 0000000000000000 [ 62.642723] [ 62.644330] Uninit was created at: [ 62.647861] kmsan_internal_poison_shadow+0xb8/0x1b0 [ 62.652959] kmsan_kmalloc+0x94/0x100 [ 62.657019] kmsan_slab_alloc+0x10/0x20 [ 62.660990] __kmalloc_node_track_caller+0xb35/0x11b0 [ 62.666173] __alloc_skb+0x2cb/0x9e0 [ 62.669870] alloc_skb_with_frags+0x1e6/0xb80 [ 62.674353] sock_alloc_send_pskb+0xb56/0x11a0 [ 62.678923] packet_sendmsg+0x6672/0x8cc0 [ 62.683083] ___sys_sendmsg+0xec8/0x1320 [ 62.687180] __x64_sys_sendmsg+0x331/0x460 [ 62.691419] do_syscall_64+0x15b/0x230 [ 62.695302] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 62.700466] ================================================================== [ 62.707801] Disabling lock debugging due to kernel taint [ 62.713331] Kernel panic - not syncing: panic_on_warn set ... [ 62.713331] [ 62.720675] CPU: 1 PID: 4507 Comm: syz-executor679 Tainted: G B 4.17.0+ #9 [ 62.728974] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.738324] Call Trace: [ 62.740922] dump_stack+0x185/0x1d0 [ 62.744547] panic+0x3d0/0x990 [ 62.747746] kmsan_report+0x29e/0x2a0 [ 62.751531] __msan_warning_32+0x70/0xc0 [ 62.755586] ip_tunnel_xmit+0x5dc/0x37c0 [ 62.759642] ? skb_push+0x16b/0x260 [ 62.763619] ipgre_xmit+0xe16/0xef0 [ 62.767245] ? ipgre_close+0x230/0x230 [ 62.771123] dev_hard_start_xmit+0x5f6/0xc80 [ 62.775526] __dev_queue_xmit+0x2ad2/0x3540 [ 62.779922] ? packet_sendmsg+0x6672/0x8cc0 [ 62.784229] ? sock_alloc_send_pskb+0xff3/0x11a0 [ 62.788993] dev_queue_xmit+0x4b/0x60 [ 62.792792] ? __netdev_pick_tx+0xb50/0xb50 [ 62.797116] packet_sendmsg+0x818b/0x8cc0 [ 62.801265] ? kmsan_set_origin+0x9e/0x160 [ 62.805516] ? kmsan_internal_unpoison_shadow+0x83/0xe0 [ 62.810904] ? rw_copy_check_uvector+0x5af/0x6c0 [ 62.815794] ? __msan_metadata_ptr_for_store_8+0x13/0x20 [ 62.821252] ? copy_msghdr_from_user+0x72c/0x830 [ 62.825998] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 62.831361] ? compat_packet_setsockopt+0x360/0x360 [ 62.836364] ___sys_sendmsg+0xec8/0x1320 [ 62.840419] ? __fdget+0x4e/0x60 [ 62.843778] __x64_sys_sendmsg+0x331/0x460 [ 62.848091] ? ___sys_sendmsg+0x1320/0x1320 [ 62.852403] do_syscall_64+0x15b/0x230 [ 62.856294] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 62.862046] RIP: 0033:0x441179 [ 62.865215] RSP: 002b:00007ffd1fa252f8 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 62.872916] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441179 [ 62.880168] RDX: 0000000000000000 RSI: 0000000020001540 RDI: 0000000000000003 [ 62.887416] RBP: 00000000006cc018 R08: 0000000000000000 R09: 0000000000000000 [ 62.894673] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000402080 [ 62.901920] R13: 0000000000402110 R14: 0000000000000000 R15: 0000000000000000 [ 62.909663] Dumping ftrace buffer: [ 62.913190] (ftrace buffer empty) [ 62.916875] Kernel Offset: disabled [ 62.920484] Rebooting in 86400 seconds..