[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 24.856560] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 30.355187] random: sshd: uninitialized urandom read (32 bytes read) [ 30.588828] random: sshd: uninitialized urandom read (32 bytes read) [ 31.198344] random: sshd: uninitialized urandom read (32 bytes read) [ 31.433099] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.45' (ECDSA) to the list of known hosts. [ 37.089842] random: sshd: uninitialized urandom read (32 bytes read) [ 37.218889] IPVS: ftp: loaded support on port[0] = 21 [ 37.385811] bridge0: port 1(bridge_slave_0) entered blocking state [ 37.392514] bridge0: port 1(bridge_slave_0) entered disabled state [ 37.399505] device bridge_slave_0 entered promiscuous mode [ 37.417455] bridge0: port 2(bridge_slave_1) entered blocking state [ 37.423869] bridge0: port 2(bridge_slave_1) entered disabled state [ 37.430712] device bridge_slave_1 entered promiscuous mode [ 37.447738] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 37.465120] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 37.515577] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 37.536982] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 37.610149] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 37.617557] team0: Port device team_slave_0 added [ 37.635095] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 37.642332] team0: Port device team_slave_1 added [ 37.659650] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 37.682141] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 37.701912] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 37.722104] 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 [ 37.865037] bridge0: port 2(bridge_slave_1) entered blocking state [ 37.871454] bridge0: port 2(bridge_slave_1) entered forwarding state [ 37.878399] bridge0: port 1(bridge_slave_0) entered blocking state [ 37.884812] 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 [ 38.390780] 8021q: adding VLAN 0 to HW filter on device bond0 [ 38.443062] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 38.494909] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 38.501029] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 38.509493] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 38.559205] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 38.846305] ================================================================== [ 38.853770] BUG: KASAN: slab-out-of-bounds in ip6_tnl_parse_tlv_enc_lim+0x5df/0x660 [ 38.861550] Read of size 1 at addr ffff8801c45fd707 by task syz-executor988/5350 [ 38.869062] [ 38.870695] CPU: 0 PID: 5350 Comm: syz-executor988 Not tainted 4.19.0-rc2+ #96 [ 38.878033] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.887368] Call Trace: [ 38.889945] dump_stack+0x1c4/0x2b4 [ 38.893560] ? dump_stack_print_info.cold.2+0x52/0x52 [ 38.898742] ? printk+0xa7/0xcf [ 38.902031] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 38.906779] print_address_description.cold.8+0x9/0x1ff [ 38.912129] kasan_report.cold.9+0x242/0x309 [ 38.916525] ? ip6_tnl_parse_tlv_enc_lim+0x5df/0x660 [ 38.921614] __asan_report_load1_noabort+0x14/0x20 [ 38.926529] ip6_tnl_parse_tlv_enc_lim+0x5df/0x660 [ 38.931447] ip6_tnl_start_xmit+0x3e2/0x2370 [ 38.935846] ? ip6_tnl_xmit+0x3850/0x3850 [ 38.939987] ? mark_held_locks+0x130/0x130 [ 38.944210] ? graph_lock+0x170/0x170 [ 38.947992] ? __lock_acquire+0x7ec/0x4ec0 [ 38.952219] ? __lock_acquire+0x7ec/0x4ec0 [ 38.956446] ? graph_lock+0x170/0x170 [ 38.960279] ? graph_lock+0x170/0x170 [ 38.964069] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.969589] ? check_preemption_disabled+0x48/0x200 [ 38.974588] ? check_preemption_disabled+0x48/0x200 [ 38.979776] ? __lock_is_held+0xb5/0x140 [ 38.983835] dev_hard_start_xmit+0x27f/0xc70 [ 38.988234] ? dev_direct_xmit+0x6b0/0x6b0 [ 38.992455] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 38.997983] ? netif_skb_features+0x690/0xb70 [ 39.002470] ? rcu_bh_qs+0xc0/0xc0 [ 39.006000] ? validate_xmit_xfrm+0x1ef/0xda0 [ 39.010490] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.016041] ? validate_xmit_skb+0x80c/0xf30 [ 39.020451] ? netif_skb_features+0xb70/0xb70 [ 39.024940] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.030463] ? check_preemption_disabled+0x48/0x200 [ 39.035498] ? check_preemption_disabled+0x48/0x200 [ 39.040506] __dev_queue_xmit+0x2f0d/0x3950 [ 39.044815] ? save_stack+0x43/0xd0 [ 39.048711] ? kasan_kmalloc+0xc7/0xe0 [ 39.052589] ? __kmalloc_node_track_caller+0x47/0x70 [ 39.057685] ? netdev_pick_tx+0x2d0/0x2d0 [ 39.061819] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.067339] ? check_preemption_disabled+0x48/0x200 [ 39.072352] ? check_preemption_disabled+0x48/0x200 [ 39.077374] ? __lock_is_held+0xb5/0x140 [ 39.081435] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 39.086439] ? skb_release_data+0x1c4/0x880 [ 39.090748] ? kmem_cache_alloc_node_trace+0x34b/0x740 [ 39.096008] ? kasan_unpoison_shadow+0x35/0x50 [ 39.100574] ? skb_tx_error+0x2f0/0x2f0 [ 39.104536] ? __kmalloc_node_track_caller+0x47/0x70 [ 39.109635] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 39.115164] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 39.120684] ? kasan_check_write+0x14/0x20 [ 39.124901] ? pskb_expand_head+0x6b3/0x10f0 [ 39.129310] ? __pskb_copy_fclone+0xeb0/0xeb0 [ 39.133787] ? skb_checksum+0x140/0x140 [ 39.137751] ? __lock_is_held+0xb5/0x140 [ 39.141794] ? kasan_check_write+0x14/0x20 [ 39.146036] ? __skb_clone+0x6c7/0xa00 [ 39.149905] ? __copy_skb_header+0x6b0/0x6b0 [ 39.154298] ? kmem_cache_alloc+0x33a/0x730 [ 39.158608] ? depot_save_stack+0x292/0x470 [ 39.162918] ? skb_ensure_writable+0x15e/0x640 [ 39.167489] dev_queue_xmit+0x17/0x20 [ 39.171274] ? dev_queue_xmit+0x17/0x20 [ 39.175236] __bpf_redirect+0x5cf/0xb20 [ 39.179201] bpf_clone_redirect+0x2f6/0x490 [ 39.183512] bpf_prog_759a992c578a3894+0x497/0x1000 [ 39.188512] ? genl_ctrl_event+0x150/0xa50 [ 39.192742] ? lock_downgrade+0x900/0x900 [ 39.196871] ? ktime_get+0x352/0x440 [ 39.200575] ? find_held_lock+0x36/0x1c0 [ 39.204623] ? lock_acquire+0x1ed/0x520 [ 39.208585] ? bpf_test_run+0x32e/0x5a0 [ 39.212546] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.218077] ? check_preemption_disabled+0x48/0x200 [ 39.223087] ? kasan_check_read+0x11/0x20 [ 39.227220] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 39.232483] ? rcu_bh_qs+0xc0/0xc0 [ 39.236002] ? __build_skb+0x359/0x430 [ 39.239869] ? skb_try_coalesce+0x1b70/0x1b70 [ 39.244361] ? bpf_test_run+0x1c0/0x5a0 [ 39.248327] ? netlink_diag_dump+0x2a0/0x2a0 [ 39.252725] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 39.258271] ? bpf_test_init.isra.9+0x70/0x100 [ 39.262854] ? bpf_prog_test_run_skb+0x634/0xb40 [ 39.267595] ? bpf_test_finish.isra.8+0x1f0/0x1f0 [ 39.272433] ? bpf_prog_add+0x69/0xd0 [ 39.276236] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.281753] ? __bpf_prog_get+0x9b/0x290 [ 39.285821] ? bpf_test_finish.isra.8+0x1f0/0x1f0 [ 39.290664] ? bpf_prog_test_run+0x130/0x1a0 [ 39.295082] ? __x64_sys_bpf+0x3d8/0x510 [ 39.299125] ? bpf_prog_get+0x20/0x20 [ 39.302919] ? do_syscall_64+0x1b9/0x820 [ 39.307004] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 39.312358] ? syscall_return_slowpath+0x5e0/0x5e0 [ 39.317270] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.322098] ? trace_hardirqs_off+0x300/0x300 [ 39.326615] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 39.331620] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.337155] ? prepare_exit_to_usermode+0x291/0x3b0 [ 39.342179] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.347032] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.352384] [ 39.353994] Allocated by task 5350: [ 39.357604] save_stack+0x43/0xd0 [ 39.361040] kasan_kmalloc+0xc7/0xe0 [ 39.364751] __kmalloc_node_track_caller+0x47/0x70 [ 39.369665] __kmalloc_reserve.isra.39+0x41/0xe0 [ 39.374404] pskb_expand_head+0x230/0x10f0 [ 39.378621] skb_ensure_writable+0x3dd/0x640 [ 39.383016] bpf_clone_redirect+0x14a/0x490 [ 39.387321] bpf_prog_759a992c578a3894+0x497/0x1000 [ 39.392467] [ 39.394078] Freed by task 3562: [ 39.397341] save_stack+0x43/0xd0 [ 39.400796] __kasan_slab_free+0x102/0x150 [ 39.405017] kasan_slab_free+0xe/0x10 [ 39.408801] kfree+0xcf/0x230 [ 39.411892] load_elf_binary+0x25a8/0x5620 [ 39.416125] search_binary_handler+0x17d/0x570 [ 39.420689] __do_execve_file.isra.33+0x162f/0x2540 [ 39.425688] __x64_sys_execve+0x8f/0xc0 [ 39.429647] do_syscall_64+0x1b9/0x820 [ 39.433517] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.438682] [ 39.440318] The buggy address belongs to the object at ffff8801c45fd500 [ 39.440318] which belongs to the cache kmalloc-512 of size 512 [ 39.452956] The buggy address is located 7 bytes to the right of [ 39.452956] 512-byte region [ffff8801c45fd500, ffff8801c45fd700) [ 39.465163] The buggy address belongs to the page: [ 39.470072] page:ffffea0007117f40 count:1 mapcount:0 mapping:ffff8801da800940 index:0x0 [ 39.478196] flags: 0x2fffc0000000100(slab) [ 39.482424] raw: 02fffc0000000100 ffffea000706f508 ffffea0006f4b048 ffff8801da800940 [ 39.490290] raw: 0000000000000000 ffff8801c45fd000 0000000100000006 0000000000000000 [ 39.498299] page dumped because: kasan: bad access detected [ 39.504022] [ 39.505652] Memory state around the buggy address: [ 39.510565] ffff8801c45fd600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 39.517920] ffff8801c45fd680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 39.525262] >ffff8801c45fd700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 39.532610] ^ [ 39.535960] ffff8801c45fd780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 39.543312] ffff8801c45fd800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 39.550671] ================================================================== [ 39.558006] Disabling lock debugging due to kernel taint [ 39.563498] Kernel panic - not syncing: panic_on_warn set ... [ 39.563498] [ 39.570871] CPU: 0 PID: 5350 Comm: syz-executor988 Tainted: G B 4.19.0-rc2+ #96 [ 39.579615] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.588947] Call Trace: [ 39.591526] dump_stack+0x1c4/0x2b4 [ 39.595181] ? dump_stack_print_info.cold.2+0x52/0x52 [ 39.600360] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 39.605101] panic+0x238/0x4e7 [ 39.608335] ? add_taint.cold.5+0x16/0x16 [ 39.612492] ? trace_hardirqs_on+0xb4/0x310 [ 39.616798] kasan_end_report+0x47/0x4f [ 39.620751] kasan_report.cold.9+0x76/0x309 [ 39.625067] ? ip6_tnl_parse_tlv_enc_lim+0x5df/0x660 [ 39.630166] __asan_report_load1_noabort+0x14/0x20 [ 39.635080] ip6_tnl_parse_tlv_enc_lim+0x5df/0x660 [ 39.640008] ip6_tnl_start_xmit+0x3e2/0x2370 [ 39.644424] ? ip6_tnl_xmit+0x3850/0x3850 [ 39.648556] ? mark_held_locks+0x130/0x130 [ 39.652798] ? graph_lock+0x170/0x170 [ 39.656580] ? __lock_acquire+0x7ec/0x4ec0 [ 39.660795] ? __lock_acquire+0x7ec/0x4ec0 [ 39.665014] ? graph_lock+0x170/0x170 [ 39.668797] ? graph_lock+0x170/0x170 [ 39.672582] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.678105] ? check_preemption_disabled+0x48/0x200 [ 39.683115] ? check_preemption_disabled+0x48/0x200 [ 39.688115] ? __lock_is_held+0xb5/0x140 [ 39.692169] dev_hard_start_xmit+0x27f/0xc70 [ 39.696581] ? dev_direct_xmit+0x6b0/0x6b0 [ 39.700837] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 39.706376] ? netif_skb_features+0x690/0xb70 [ 39.710856] ? rcu_bh_qs+0xc0/0xc0 [ 39.714387] ? validate_xmit_xfrm+0x1ef/0xda0 [ 39.718882] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.724404] ? validate_xmit_skb+0x80c/0xf30 [ 39.728798] ? netif_skb_features+0xb70/0xb70 [ 39.733274] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.738795] ? check_preemption_disabled+0x48/0x200 [ 39.743793] ? check_preemption_disabled+0x48/0x200 [ 39.748809] __dev_queue_xmit+0x2f0d/0x3950 [ 39.753115] ? save_stack+0x43/0xd0 [ 39.756721] ? kasan_kmalloc+0xc7/0xe0 [ 39.760587] ? __kmalloc_node_track_caller+0x47/0x70 [ 39.765676] ? netdev_pick_tx+0x2d0/0x2d0 [ 39.769807] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.775328] ? check_preemption_disabled+0x48/0x200 [ 39.780326] ? check_preemption_disabled+0x48/0x200 [ 39.785334] ? __lock_is_held+0xb5/0x140 [ 39.789381] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 39.794382] ? skb_release_data+0x1c4/0x880 [ 39.798685] ? kmem_cache_alloc_node_trace+0x34b/0x740 [ 39.803944] ? kasan_unpoison_shadow+0x35/0x50 [ 39.808506] ? skb_tx_error+0x2f0/0x2f0 [ 39.812467] ? __kmalloc_node_track_caller+0x47/0x70 [ 39.817551] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 39.823204] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 39.828726] ? kasan_check_write+0x14/0x20 [ 39.832969] ? pskb_expand_head+0x6b3/0x10f0 [ 39.837364] ? __pskb_copy_fclone+0xeb0/0xeb0 [ 39.841841] ? skb_checksum+0x140/0x140 [ 39.845799] ? __lock_is_held+0xb5/0x140 [ 39.849857] ? kasan_check_write+0x14/0x20 [ 39.854073] ? __skb_clone+0x6c7/0xa00 [ 39.857941] ? __copy_skb_header+0x6b0/0x6b0 [ 39.862334] ? kmem_cache_alloc+0x33a/0x730 [ 39.866641] ? depot_save_stack+0x292/0x470 [ 39.870958] ? skb_ensure_writable+0x15e/0x640 [ 39.875526] dev_queue_xmit+0x17/0x20 [ 39.879321] ? dev_queue_xmit+0x17/0x20 [ 39.883282] __bpf_redirect+0x5cf/0xb20 [ 39.887252] bpf_clone_redirect+0x2f6/0x490 [ 39.891574] bpf_prog_759a992c578a3894+0x497/0x1000 [ 39.896572] ? genl_ctrl_event+0x150/0xa50 [ 39.900802] ? lock_downgrade+0x900/0x900 [ 39.904935] ? ktime_get+0x352/0x440 [ 39.908633] ? find_held_lock+0x36/0x1c0 [ 39.912678] ? lock_acquire+0x1ed/0x520 [ 39.916658] ? bpf_test_run+0x32e/0x5a0 [ 39.920616] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.926144] ? check_preemption_disabled+0x48/0x200 [ 39.931141] ? kasan_check_read+0x11/0x20 [ 39.935272] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 39.940528] ? rcu_bh_qs+0xc0/0xc0 [ 39.944053] ? __build_skb+0x359/0x430 [ 39.947929] ? skb_try_coalesce+0x1b70/0x1b70 [ 39.952420] ? bpf_test_run+0x1c0/0x5a0 [ 39.956376] ? netlink_diag_dump+0x2a0/0x2a0 [ 39.960764] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 39.966281] ? bpf_test_init.isra.9+0x70/0x100 [ 39.970846] ? bpf_prog_test_run_skb+0x634/0xb40 [ 39.975584] ? bpf_test_finish.isra.8+0x1f0/0x1f0 [ 39.980409] ? bpf_prog_add+0x69/0xd0 [ 39.984205] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.989725] ? __bpf_prog_get+0x9b/0x290 [ 39.993771] ? bpf_test_finish.isra.8+0x1f0/0x1f0 [ 39.998621] ? bpf_prog_test_run+0x130/0x1a0 [ 40.003192] ? __x64_sys_bpf+0x3d8/0x510 [ 40.007235] ? bpf_prog_get+0x20/0x20 [ 40.011025] ? do_syscall_64+0x1b9/0x820 [ 40.015070] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 40.020420] ? syscall_return_slowpath+0x5e0/0x5e0 [ 40.025333] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.030185] ? trace_hardirqs_off+0x300/0x300 [ 40.034678] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 40.039681] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.045202] ? prepare_exit_to_usermode+0x291/0x3b0 [ 40.050240] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.055067] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.061307] Kernel Offset: disabled [ 40.064933] Rebooting in 86400 seconds..