[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.348655] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.996596] random: sshd: uninitialized urandom read (32 bytes read) [ 24.388941] random: sshd: uninitialized urandom read (32 bytes read) [ 24.894834] random: sshd: uninitialized urandom read (32 bytes read) [ 25.065436] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.42' (ECDSA) to the list of known hosts. [ 30.722525] random: sshd: uninitialized urandom read (32 bytes read) [ 30.819770] IPVS: ftp: loaded support on port[0] = 21 [ 30.948517] bridge0: port 1(bridge_slave_0) entered blocking state [ 30.954958] bridge0: port 1(bridge_slave_0) entered disabled state [ 30.962434] device bridge_slave_0 entered promiscuous mode [ 30.979159] bridge0: port 2(bridge_slave_1) entered blocking state [ 30.985522] bridge0: port 2(bridge_slave_1) entered disabled state [ 30.992846] device bridge_slave_1 entered promiscuous mode [ 31.008954] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 31.024794] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 31.065583] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 31.084329] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 31.146705] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 31.153978] team0: Port device team_slave_0 added [ 31.168830] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 31.175945] team0: Port device team_slave_1 added [ 31.191530] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 31.208792] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 31.226471] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 31.243667] 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 [ 31.362150] bridge0: port 2(bridge_slave_1) entered blocking state [ 31.368572] bridge0: port 2(bridge_slave_1) entered forwarding state [ 31.375486] bridge0: port 1(bridge_slave_0) entered blocking state [ 31.381852] bridge0: port 1(bridge_slave_0) entered forwarding state RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument [ 31.798904] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 31.805006] 8021q: adding VLAN 0 to HW filter on device bond0 [ 31.847986] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 31.890989] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 31.899095] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 31.942416] 8021q: adding VLAN 0 to HW filter on device team0 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 [ 32.887699] syz-executor511 (4749) used greatest stack depth: 15688 bytes left [ 32.912814] dst_release: dst:(____ptrval____) refcnt:-1 [ 32.918423] dst_release: dst:(____ptrval____) refcnt:-2 [ 32.921071] WARNING: CPU: 0 PID: 4753 at include/net/dst.h:239 ip6_setup_cork+0xd66/0x1830 [ 32.923907] dst_release: dst:(____ptrval____) refcnt:-1 [ 32.932179] Kernel panic - not syncing: panic_on_warn set ... [ 32.932179] [ 32.932195] CPU: 0 PID: 4753 Comm: syz-executor511 Not tainted 4.18.0-rc7+ #176 [ 32.932202] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.932207] Call Trace: [ 32.932227] dump_stack+0x1c9/0x2b4 [ 32.932249] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.937748] dst_release: dst:(____ptrval____) refcnt:-2 [ 32.945011] panic+0x238/0x4e7 [ 32.945029] ? add_taint.cold.5+0x16/0x16 [ 32.945049] ? __warn.cold.8+0x148/0x1ba [ 32.945062] ? __warn.cold.8+0x117/0x1ba [ 32.945082] ? ip6_setup_cork+0xd66/0x1830 [ 32.998233] __warn.cold.8+0x163/0x1ba [ 33.002131] ? ip6_setup_cork+0xd66/0x1830 [ 33.006376] report_bug+0x252/0x2d0 [ 33.010012] do_error_trap+0x1fc/0x4d0 [ 33.013912] ? math_error+0x3e0/0x3e0 [ 33.017719] ? xfrm_lookup+0x82f/0x2880 [ 33.021703] ? refcount_inc_not_zero+0x2f0/0x2f0 [ 33.026466] ? addrconf_rs_timer+0x690/0x690 [ 33.030887] ? graph_lock+0x170/0x170 [ 33.034707] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.039558] do_invalid_op+0x1b/0x20 [ 33.043275] invalid_op+0x14/0x20 [ 33.046738] RIP: 0010:ip6_setup_cork+0xd66/0x1830 [ 33.051587] Code: c1 ed 03 89 9d 18 ff ff ff 48 b8 00 00 00 00 00 fc ff df 41 c6 44 05 00 f8 e9 2d 01 00 00 4c 8b a5 c8 fe ff ff e8 1a 5d ce fb <0f> 0b e9 6a fc ff ff e8 0e 5d ce fb 48 8b 85 d0 fe ff ff 48 8d 78 [ 33.070774] RSP: 0018:ffff8801d32a7178 EFLAGS: 00010293 [ 33.076139] RAX: ffff8801ce09a380 RBX: 0000000000000000 RCX: ffffffff85adb746 [ 33.083403] RDX: 0000000000000000 RSI: ffffffff85adbb16 RDI: 0000000000000005 [ 33.090657] RBP: ffff8801d32a72c8 R08: ffff8801ce09a380 R09: ffffed0035b35a90 [ 33.097915] R10: ffffed0035b35a90 R11: ffff8801ad9ad483 R12: ffff8801d32a7720 [ 33.105172] R13: ffff8801d32a76a0 R14: ffff8801ad9ad480 R15: ffff8801ad9ad440 [ 33.112439] ? ip6_setup_cork+0x996/0x1830 [ 33.116661] ? ip6_setup_cork+0xd66/0x1830 [ 33.120888] ? ip6_setup_cork+0xd66/0x1830 [ 33.125111] ? graph_lock+0x170/0x170 [ 33.128906] ? ip6_autoflowlabel.part.48+0x80/0x80 [ 33.133822] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.139348] ? dst_release+0x5d/0xb0 [ 33.143059] ? find_held_lock+0x36/0x1c0 [ 33.147125] ip6_make_skb+0x2c8/0x600 [ 33.150912] ? ip_reply_glue_bits+0xc0/0xc0 [ 33.155226] ? ip6_push_pending_frames+0xf0/0xf0 [ 33.159973] ? ip6_dst_hoplimit+0xd3/0x4d0 [ 33.164197] ? ipv6_select_ident+0x150/0x150 [ 33.168595] udpv6_sendmsg+0x2c90/0x35f0 [ 33.172652] ? ip_reply_glue_bits+0xc0/0xc0 [ 33.176974] ? udpv6_queue_rcv_skb+0x1530/0x1530 [ 33.181746] ? graph_lock+0x170/0x170 [ 33.185552] ? find_held_lock+0x36/0x1c0 [ 33.189606] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.195137] ? rw_copy_check_uvector+0x30d/0x3e0 [ 33.199885] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.205406] ? import_iovec+0x269/0x470 [ 33.209366] ? dup_iter+0x270/0x270 [ 33.212982] inet_sendmsg+0x1a1/0x690 [ 33.216769] ? udpv6_queue_rcv_skb+0x1530/0x1530 [ 33.221520] ? inet_sendmsg+0x1a1/0x690 [ 33.225482] ? copy_msghdr_from_user+0x3c4/0x580 [ 33.230230] ? ipip_gro_receive+0x100/0x100 [ 33.234539] ? move_addr_to_kernel.part.20+0x100/0x100 [ 33.239800] ? security_socket_sendmsg+0x94/0xc0 [ 33.244539] ? ipip_gro_receive+0x100/0x100 [ 33.248849] sock_sendmsg+0xd5/0x120 [ 33.252559] ___sys_sendmsg+0x51d/0x930 [ 33.256533] ? copy_msghdr_from_user+0x580/0x580 [ 33.261273] ? __lock_acquire+0x7fc/0x5020 [ 33.265494] ? __fget_light+0x2f7/0x440 [ 33.269449] ? fget_raw+0x20/0x20 [ 33.272911] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.278432] ? sockfd_lookup_light+0xc5/0x160 [ 33.282910] __sys_sendmmsg+0x240/0x6f0 [ 33.286872] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 33.291204] ? lock_downgrade+0x8f0/0x8f0 [ 33.295343] ? finish_task_switch+0x18a/0x870 [ 33.299827] ? kasan_check_read+0x11/0x20 [ 33.303959] ? do_raw_spin_unlock+0xa7/0x2f0 [ 33.308350] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 33.312920] __x64_sys_sendmmsg+0x9d/0x100 [ 33.317143] do_syscall_64+0x1b9/0x820 [ 33.321021] ? finish_task_switch+0x1d3/0x870 [ 33.325515] ? syscall_return_slowpath+0x5e0/0x5e0 [ 33.330428] ? syscall_return_slowpath+0x31d/0x5e0 [ 33.335343] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 33.340699] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.345528] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.350710] RIP: 0033:0x446a29 [ 33.353888] Code: e8 ac b8 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 [ 33.373096] RSP: 002b:00007f87a37f0db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 33.380794] RAX: ffffffffffffffda RBX: 00000000006dcc38 RCX: 0000000000446a29 [ 33.388055] RDX: 00000000000000b8 RSI: 0000000020001b00 RDI: 0000000000000003 [ 33.395311] RBP: 00000000006dcc30 R08: 00007f87a37f1700 R09: 0000000000000000 [ 33.402580] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc3c [ 33.409840] R13: 00007ffc2ee02d6f R14: 00007f87a37f19c0 R15: 0000000000000001 [ 33.417511] Dumping ftrace buffer: [ 33.421123] (ftrace buffer empty) [ 33.424818] Kernel Offset: disabled [ 33.428426] Rebooting in 86400 seconds..