[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.294807] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.935009] random: sshd: uninitialized urandom read (32 bytes read) [ 19.231214] random: sshd: uninitialized urandom read (32 bytes read) [ 19.917794] random: sshd: uninitialized urandom read (32 bytes read) [ 24.474116] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. [ 30.048868] random: sshd: uninitialized urandom read (32 bytes read) [ 30.133500] IPVS: ftp: loaded support on port[0] = 21 [ 30.235704] bridge0: port 1(bridge_slave_0) entered blocking state [ 30.242178] bridge0: port 1(bridge_slave_0) entered disabled state [ 30.249232] device bridge_slave_0 entered promiscuous mode [ 30.264523] bridge0: port 2(bridge_slave_1) entered blocking state [ 30.270919] bridge0: port 2(bridge_slave_1) entered disabled state [ 30.277851] device bridge_slave_1 entered promiscuous mode [ 30.291676] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 30.306228] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 30.341342] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 30.356705] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 30.407960] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 30.415453] team0: Port device team_slave_0 added [ 30.428146] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 30.435239] team0: Port device team_slave_1 added [ 30.447245] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 30.461856] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 30.476535] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 30.491873] 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 RTNETLINK answers: Operation not supported [ 30.585210] bridge0: port 2(bridge_slave_1) entered blocking state [ 30.591625] bridge0: port 2(bridge_slave_1) entered forwarding state [ 30.599462] bridge0: port 1(bridge_slave_0) entered blocking state [ 30.605810] bridge0: port 1(bridge_slave_0) entered forwarding state RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument [ 30.923323] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 30.929449] 8021q: adding VLAN 0 to HW filter on device bond0 [ 30.968856] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 31.002454] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 31.009534] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 31.038601] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 31.044752] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 31.192216] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 32.968367] dst_release: dst:(____ptrval____) refcnt:-1 [ 32.973943] dst_release: dst:(____ptrval____) refcnt:-2 [ 32.979389] dst_release: dst:(____ptrval____) refcnt:-3 [ 32.980993] WARNING: CPU: 1 PID: 4792 at include/net/dst.h:239 __ip6_make_skb+0x1798/0x21e0 [ 32.984792] dst_release: dst:(____ptrval____) refcnt:-1 [ 32.993245] Kernel panic - not syncing: panic_on_warn set ... [ 32.993245] [ 32.993257] CPU: 1 PID: 4792 Comm: syz-executor089 Not tainted 4.18.0-rc3+ #122 [ 32.993262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.993265] Call Trace: [ 32.993281] dump_stack+0x1c9/0x2b4 [ 32.993294] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.998739] dst_release: dst:(____ptrval____) refcnt:-2 [ 33.006001] panic+0x238/0x4e7 [ 33.006010] ? add_taint.cold.5+0x16/0x16 [ 33.006019] ? __warn.cold.8+0x148/0x1ba [ 33.006031] ? __warn.cold.8+0x117/0x1ba [ 33.055129] ? __ip6_make_skb+0x1798/0x21e0 [ 33.059441] __warn.cold.8+0x163/0x1ba [ 33.063313] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 33.068048] ? __ip6_make_skb+0x1798/0x21e0 [ 33.072348] report_bug+0x252/0x2d0 [ 33.075957] do_error_trap+0x1fc/0x4d0 [ 33.079825] ? math_error+0x3e0/0x3e0 [ 33.083705] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 33.089431] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.094261] do_invalid_op+0x1b/0x20 [ 33.097956] invalid_op+0x14/0x20 [ 33.101398] RIP: 0010:__ip6_make_skb+0x1798/0x21e0 [ 33.106306] Code: 9e fe 0f 00 e9 9e f4 ff ff e8 f4 f4 e2 fa 48 8b 54 24 48 48 8b 74 24 50 48 89 df e8 a2 81 0f 00 e9 0b f4 ff ff e8 d8 f4 e2 fa <0f> 0b e9 68 fc ff ff 48 8d 83 80 00 00 00 4c 8d ab 84 00 00 00 48 [ 33.125558] RSP: 0018:ffff8801c89c7090 EFLAGS: 00010293 [ 33.130914] RAX: ffff8801c8a4e3c0 RBX: ffff8801c957db40 RCX: ffffffff86991304 [ 33.138285] RDX: 0000000000000000 RSI: ffffffff869916f8 RDI: 0000000000000005 [ 33.145536] RBP: ffff8801c89c72f8 R08: ffff8801c8a4e3c0 R09: ffffed00359f5ad0 [ 33.152807] R10: ffffed00359f5ad0 R11: ffff8801acfad683 R12: 0000000000000000 [ 33.160445] R13: ffff8801acfad680 R14: 1ffff10039138e3a R15: ffff8801acfad640 [ 33.167713] ? __ip6_make_skb+0x13a4/0x21e0 [ 33.172022] ? __ip6_make_skb+0x1798/0x21e0 [ 33.176337] ? ip6_output+0x9d0/0x9d0 [ 33.180117] ? lock_acquire+0x1e4/0x540 [ 33.184073] ? ip6_sk_dst_store_flow+0x507/0xa70 [ 33.188809] ? ip6_setup_cork+0x1247/0x19a0 [ 33.193109] ? lock_release+0xa30/0xa30 [ 33.197076] ? sk_dst_check+0x285/0x5d0 [ 33.201051] ? ip6_autoflowlabel.part.48+0x80/0x80 [ 33.205959] ? dst_release+0x5d/0xb0 [ 33.210100] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 33.215617] ? sk_setup_caps+0x1f8/0x680 [ 33.219666] ? ip6_sk_dst_store_flow+0x566/0xa70 [ 33.224409] ip6_make_skb+0x3b3/0x5e0 [ 33.228194] ? ip_reply_glue_bits+0xc0/0xc0 [ 33.232779] ? ip6_push_pending_frames+0xf0/0xf0 [ 33.237525] ? ip6_dst_hoplimit+0xd3/0x4d0 [ 33.241765] ? ipv6_select_ident+0x150/0x150 [ 33.246171] udpv6_sendmsg+0x2d46/0x36b0 [ 33.250224] ? ip_reply_glue_bits+0xc0/0xc0 [ 33.254528] ? udpv6_queue_rcv_skb+0x15e0/0x15e0 [ 33.259292] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.264816] ? rw_copy_check_uvector+0x30d/0x3e0 [ 33.269564] ? dup_iter+0x270/0x270 [ 33.273176] inet_sendmsg+0x1a1/0x690 [ 33.276959] ? udpv6_queue_rcv_skb+0x15e0/0x15e0 [ 33.281787] ? inet_sendmsg+0x1a1/0x690 [ 33.285759] ? copy_msghdr_from_user+0x3c4/0x580 [ 33.290495] ? ipip_gro_receive+0x100/0x100 [ 33.294802] ? move_addr_to_kernel.part.20+0x100/0x100 [ 33.300061] ? security_socket_sendmsg+0x94/0xc0 [ 33.304794] ? ipip_gro_receive+0x100/0x100 [ 33.309095] sock_sendmsg+0xd5/0x120 [ 33.312787] ___sys_sendmsg+0x51d/0x930 [ 33.316741] ? copy_msghdr_from_user+0x580/0x580 [ 33.321488] ? __fget_light+0x2f7/0x440 [ 33.325441] ? fget_raw+0x20/0x20 [ 33.328881] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.334396] ? sockfd_lookup_light+0xc5/0x160 [ 33.338878] __sys_sendmmsg+0x240/0x6f0 [ 33.342842] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 33.347254] ? finish_task_switch+0x1d3/0x890 [ 33.351730] ? lock_downgrade+0x8f0/0x8f0 [ 33.355855] ? finish_task_switch+0x18a/0x890 [ 33.360332] ? kasan_check_read+0x11/0x20 [ 33.364477] ? do_raw_spin_unlock+0xa7/0x2f0 [ 33.369306] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 33.373877] __x64_sys_sendmmsg+0x9d/0x100 [ 33.378115] do_syscall_64+0x1b9/0x820 [ 33.381983] ? finish_task_switch+0x1d3/0x890 [ 33.386471] ? syscall_return_slowpath+0x5e0/0x5e0 [ 33.391390] ? syscall_return_slowpath+0x31d/0x5e0 [ 33.396320] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 33.401339] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.406174] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.411342] RIP: 0033:0x446ba9 [ 33.414531] Code: e8 cc bb 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 33.433731] RSP: 002b:00007f7e90d4bda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 33.441506] RAX: ffffffffffffffda RBX: 00000000006dcc54 RCX: 0000000000446ba9 [ 33.448756] RDX: 00000000000000b8 RSI: 0000000020001b00 RDI: 0000000000000003 [ 33.456012] RBP: 00000000006dcc50 R08: 00007f7e90d4c700 R09: 0000000000000000 [ 33.463278] R10: 0000000000000000 R11: 0000000000000246 R12: 45c828efc7a64843 [ 33.470526] R13: e6eeb815b9d8a477 R14: 5068caf6f713c6fc R15: 0000000000000001 [ 33.478204] Dumping ftrace buffer: [ 33.481729] (ftrace buffer empty) [ 33.485436] Kernel Offset: disabled [ 33.489044] Rebooting in 86400 seconds..