[....] Starting OpenBSD Secure Shell server: sshd[ 25.047622] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c[ 25.191613] random: sshd: uninitialized urandom read (32 bytes read) . [ 25.531099] random: sshd: uninitialized urandom read (32 bytes read) [ 26.136479] random: sshd: uninitialized urandom read (32 bytes read) [ 26.348533] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts. syzkaller login: [ 32.053394] random: sshd: uninitialized urandom read (32 bytes read) [ 32.182758] IPVS: ftp: loaded support on port[0] = 21 [ 32.346275] bridge0: port 1(bridge_slave_0) entered blocking state [ 32.352942] bridge0: port 1(bridge_slave_0) entered disabled state [ 32.360210] device bridge_slave_0 entered promiscuous mode [ 32.368286] ip (5364) used greatest stack depth: 16184 bytes left [ 32.380750] bridge0: port 2(bridge_slave_1) entered blocking state [ 32.387192] bridge0: port 2(bridge_slave_1) entered disabled state [ 32.394047] device bridge_slave_1 entered promiscuous mode [ 32.412401] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 32.429466] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 32.479650] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 32.499339] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 32.573665] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 32.581137] team0: Port device team_slave_0 added [ 32.598231] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 32.605399] team0: Port device team_slave_1 added [ 32.621440] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 32.640833] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 32.659633] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 32.679444] 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 [ 32.818670] bridge0: port 2(bridge_slave_1) entered blocking state [ 32.825076] bridge0: port 2(bridge_slave_1) entered forwarding state [ 32.831998] bridge0: port 1(bridge_slave_0) entered blocking state [ 32.838377] 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 [ 33.331324] 8021q: adding VLAN 0 to HW filter on device bond0 [ 33.382213] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 33.430865] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 33.437233] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 33.444307] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 33.494248] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 33.775385] ================================================================== [ 33.782842] BUG: KASAN: slab-out-of-bounds in ip6_tnl_parse_tlv_enc_lim+0x5df/0x660 [ 33.790639] Read of size 1 at addr ffff8801d21187c7 by task syz-executor281/5345 [ 33.798149] [ 33.799764] CPU: 1 PID: 5345 Comm: syz-executor281 Not tainted 4.19.0-rc3+ #238 [ 33.807193] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.816548] Call Trace: [ 33.819138] dump_stack+0x1c4/0x2b4 [ 33.822755] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.827934] ? printk+0xa7/0xcf [ 33.831199] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 33.835944] print_address_description.cold.8+0x9/0x1ff [ 33.841295] kasan_report.cold.9+0x242/0x309 [ 33.845704] ? ip6_tnl_parse_tlv_enc_lim+0x5df/0x660 [ 33.850795] __asan_report_load1_noabort+0x14/0x20 [ 33.855711] ip6_tnl_parse_tlv_enc_lim+0x5df/0x660 [ 33.860631] ip6_tnl_start_xmit+0x3e2/0x2370 [ 33.865024] ? ip6_tnl_xmit+0x3850/0x3850 [ 33.869162] ? mark_held_locks+0x130/0x130 [ 33.873401] ? graph_lock+0x170/0x170 [ 33.877192] ? __lock_acquire+0x7ec/0x4ec0 [ 33.881425] ? __lock_acquire+0x7ec/0x4ec0 [ 33.885649] ? graph_lock+0x170/0x170 [ 33.889435] ? graph_lock+0x170/0x170 [ 33.893222] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.898780] ? check_preemption_disabled+0x48/0x200 [ 33.903796] ? check_preemption_disabled+0x48/0x200 [ 33.908799] ? __lock_is_held+0xb5/0x140 [ 33.912866] dev_hard_start_xmit+0x27f/0xc70 [ 33.917550] ? dev_direct_xmit+0x6b0/0x6b0 [ 33.921779] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.927303] ? netif_skb_features+0x690/0xb70 [ 33.931785] ? rcu_bh_qs+0xc0/0xc0 [ 33.935316] ? validate_xmit_xfrm+0x1ef/0xda0 [ 33.939796] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.945322] ? validate_xmit_skb+0x80c/0xf30 [ 33.949722] ? netif_skb_features+0xb70/0xb70 [ 33.954220] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.959744] ? check_preemption_disabled+0x48/0x200 [ 33.964741] ? check_preemption_disabled+0x48/0x200 [ 33.969754] __dev_queue_xmit+0x2f3b/0x3980 [ 33.974060] ? save_stack+0x43/0xd0 [ 33.977671] ? kasan_kmalloc+0xc7/0xe0 [ 33.981543] ? __kmalloc_node_track_caller+0x47/0x70 [ 33.986642] ? netdev_pick_tx+0x2d0/0x2d0 [ 33.990798] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.996320] ? check_preemption_disabled+0x48/0x200 [ 34.001329] ? check_preemption_disabled+0x48/0x200 [ 34.006378] ? __lock_is_held+0xb5/0x140 [ 34.010446] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 34.015468] ? skb_release_data+0x1c4/0x880 [ 34.019779] ? kmem_cache_alloc_node_trace+0x34b/0x740 [ 34.025067] ? kasan_unpoison_shadow+0x35/0x50 [ 34.029640] ? skb_tx_error+0x2f0/0x2f0 [ 34.033603] ? __kmalloc_node_track_caller+0x47/0x70 [ 34.038691] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 34.044214] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 34.049738] ? kasan_check_write+0x14/0x20 [ 34.053955] ? pskb_expand_head+0x6b3/0x10f0 [ 34.058360] ? __pskb_copy_fclone+0xeb0/0xeb0 [ 34.062840] ? skb_checksum+0x140/0x140 [ 34.066821] ? __lock_is_held+0xb5/0x140 [ 34.070873] ? kasan_check_write+0x14/0x20 [ 34.075092] ? __skb_clone+0x6c7/0xa00 [ 34.078987] ? __copy_skb_header+0x6b0/0x6b0 [ 34.083382] ? kmem_cache_alloc+0x33a/0x730 [ 34.087717] ? depot_save_stack+0x292/0x470 [ 34.092029] ? skb_ensure_writable+0x15e/0x640 [ 34.096619] dev_queue_xmit+0x17/0x20 [ 34.100403] ? dev_queue_xmit+0x17/0x20 [ 34.104367] __bpf_redirect+0x5cf/0xb20 [ 34.108332] bpf_clone_redirect+0x2f6/0x490 [ 34.112649] bpf_prog_759a992c578a3894+0x741/0x1000 [ 34.117648] ? ctrl_build_family_msg+0x40/0xa0 [ 34.122216] ? lock_downgrade+0x900/0x900 [ 34.126378] ? ktime_get+0x352/0x440 [ 34.130084] ? find_held_lock+0x36/0x1c0 [ 34.134136] ? lock_acquire+0x1ed/0x520 [ 34.138105] ? bpf_test_run+0x32e/0x5a0 [ 34.142077] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.147603] ? check_preemption_disabled+0x48/0x200 [ 34.152622] ? kasan_check_read+0x11/0x20 [ 34.156758] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 34.162021] ? rcu_bh_qs+0xc0/0xc0 [ 34.165545] ? __build_skb+0x359/0x430 [ 34.169417] ? skb_try_coalesce+0x1b70/0x1b70 [ 34.173900] ? bpf_test_run+0x1c0/0x5a0 [ 34.177865] ? netlink_diag_dump+0x2a0/0x2a0 [ 34.182260] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 34.187780] ? bpf_test_init.isra.9+0x70/0x100 [ 34.192349] ? bpf_prog_test_run_skb+0x634/0xb40 [ 34.197097] ? bpf_test_finish.isra.8+0x1f0/0x1f0 [ 34.201924] ? bpf_prog_add+0x69/0xd0 [ 34.205711] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.211237] ? __bpf_prog_get+0x9b/0x290 [ 34.215287] ? bpf_test_finish.isra.8+0x1f0/0x1f0 [ 34.220115] ? bpf_prog_test_run+0x130/0x1a0 [ 34.224530] ? __x64_sys_bpf+0x3d8/0x510 [ 34.228579] ? bpf_prog_get+0x20/0x20 [ 34.232381] ? do_syscall_64+0x1b9/0x820 [ 34.236522] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 34.241886] ? syscall_return_slowpath+0x5e0/0x5e0 [ 34.246802] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.251637] ? trace_hardirqs_on_caller+0x310/0x310 [ 34.256660] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 34.261681] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.267214] ? prepare_exit_to_usermode+0x291/0x3b0 [ 34.272233] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.277065] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.282420] [ 34.284026] Allocated by task 5345: [ 34.287641] save_stack+0x43/0xd0 [ 34.291076] kasan_kmalloc+0xc7/0xe0 [ 34.294776] __kmalloc_node_track_caller+0x47/0x70 [ 34.299689] __kmalloc_reserve.isra.39+0x41/0xe0 [ 34.304430] pskb_expand_head+0x230/0x10f0 [ 34.308648] skb_ensure_writable+0x3dd/0x640 [ 34.313038] bpf_clone_redirect+0x14a/0x490 [ 34.317344] bpf_prog_759a992c578a3894+0x741/0x1000 [ 34.322339] [ 34.323947] Freed by task 3895: [ 34.327208] save_stack+0x43/0xd0 [ 34.330642] __kasan_slab_free+0x102/0x150 [ 34.334895] kasan_slab_free+0xe/0x10 [ 34.338698] kfree+0xcf/0x230 [ 34.341807] load_elf_binary+0x25b4/0x5620 [ 34.346025] search_binary_handler+0x17d/0x570 [ 34.350590] __do_execve_file.isra.33+0x162f/0x2540 [ 34.355587] __x64_sys_execve+0x8f/0xc0 [ 34.359545] do_syscall_64+0x1b9/0x820 [ 34.363418] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.368587] [ 34.370196] The buggy address belongs to the object at ffff8801d21185c0 [ 34.370196] which belongs to the cache kmalloc-512 of size 512 [ 34.382835] The buggy address is located 7 bytes to the right of [ 34.382835] 512-byte region [ffff8801d21185c0, ffff8801d21187c0) [ 34.395041] The buggy address belongs to the page: [ 34.399953] page:ffffea0007484600 count:1 mapcount:0 mapping:ffff8801da800940 index:0x0 [ 34.408080] flags: 0x2fffc0000000100(slab) [ 34.412300] raw: 02fffc0000000100 ffffea0007484008 ffffea0007487e88 ffff8801da800940 [ 34.420164] raw: 0000000000000000 ffff8801d21180c0 0000000100000006 0000000000000000 [ 34.428024] page dumped because: kasan: bad access detected [ 34.433710] [ 34.435315] Memory state around the buggy address: [ 34.440227] ffff8801d2118680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 34.447569] ffff8801d2118700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 34.454909] >ffff8801d2118780: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc [ 34.462245] ^ [ 34.467682] ffff8801d2118800: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 34.475028] ffff8801d2118880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 34.482373] ================================================================== [ 34.489712] Disabling lock debugging due to kernel taint [ 34.495179] Kernel panic - not syncing: panic_on_warn set ... [ 34.495179] [ 34.502553] CPU: 1 PID: 5345 Comm: syz-executor281 Tainted: G B 4.19.0-rc3+ #238 [ 34.511382] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.520735] Call Trace: [ 34.523310] dump_stack+0x1c4/0x2b4 [ 34.526937] ? dump_stack_print_info.cold.2+0x52/0x52 [ 34.532143] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 34.536897] panic+0x238/0x4e7 [ 34.540083] ? add_taint.cold.5+0x16/0x16 [ 34.544219] ? trace_hardirqs_on+0xb4/0x310 [ 34.548528] kasan_end_report+0x47/0x4f [ 34.552484] kasan_report.cold.9+0x76/0x309 [ 34.556790] ? ip6_tnl_parse_tlv_enc_lim+0x5df/0x660 [ 34.561876] __asan_report_load1_noabort+0x14/0x20 [ 34.566788] ip6_tnl_parse_tlv_enc_lim+0x5df/0x660 [ 34.571718] ip6_tnl_start_xmit+0x3e2/0x2370 [ 34.576126] ? ip6_tnl_xmit+0x3850/0x3850 [ 34.580260] ? mark_held_locks+0x130/0x130 [ 34.584480] ? graph_lock+0x170/0x170 [ 34.588261] ? __lock_acquire+0x7ec/0x4ec0 [ 34.592477] ? __lock_acquire+0x7ec/0x4ec0 [ 34.596695] ? graph_lock+0x170/0x170 [ 34.600475] ? graph_lock+0x170/0x170 [ 34.604258] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.609779] ? check_preemption_disabled+0x48/0x200 [ 34.614778] ? check_preemption_disabled+0x48/0x200 [ 34.619787] ? __lock_is_held+0xb5/0x140 [ 34.623838] dev_hard_start_xmit+0x27f/0xc70 [ 34.628238] ? dev_direct_xmit+0x6b0/0x6b0 [ 34.632458] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 34.637978] ? netif_skb_features+0x690/0xb70 [ 34.642454] ? rcu_bh_qs+0xc0/0xc0 [ 34.645982] ? validate_xmit_xfrm+0x1ef/0xda0 [ 34.650480] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.656005] ? validate_xmit_skb+0x80c/0xf30 [ 34.660400] ? netif_skb_features+0xb70/0xb70 [ 34.664878] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.670398] ? check_preemption_disabled+0x48/0x200 [ 34.675414] ? check_preemption_disabled+0x48/0x200 [ 34.680417] __dev_queue_xmit+0x2f3b/0x3980 [ 34.684723] ? save_stack+0x43/0xd0 [ 34.688330] ? kasan_kmalloc+0xc7/0xe0 [ 34.692215] ? __kmalloc_node_track_caller+0x47/0x70 [ 34.697302] ? netdev_pick_tx+0x2d0/0x2d0 [ 34.701436] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.706957] ? check_preemption_disabled+0x48/0x200 [ 34.711977] ? check_preemption_disabled+0x48/0x200 [ 34.717004] ? __lock_is_held+0xb5/0x140 [ 34.721052] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 34.726048] ? skb_release_data+0x1c4/0x880 [ 34.730359] ? kmem_cache_alloc_node_trace+0x34b/0x740 [ 34.735619] ? kasan_unpoison_shadow+0x35/0x50 [ 34.740182] ? skb_tx_error+0x2f0/0x2f0 [ 34.744166] ? __kmalloc_node_track_caller+0x47/0x70 [ 34.749257] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 34.754780] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 34.760301] ? kasan_check_write+0x14/0x20 [ 34.764549] ? pskb_expand_head+0x6b3/0x10f0 [ 34.768945] ? __pskb_copy_fclone+0xeb0/0xeb0 [ 34.773422] ? skb_checksum+0x140/0x140 [ 34.777389] ? __lock_is_held+0xb5/0x140 [ 34.781440] ? kasan_check_write+0x14/0x20 [ 34.785653] ? __skb_clone+0x6c7/0xa00 [ 34.789525] ? __copy_skb_header+0x6b0/0x6b0 [ 34.793916] ? kmem_cache_alloc+0x33a/0x730 [ 34.798224] ? depot_save_stack+0x292/0x470 [ 34.802527] ? skb_ensure_writable+0x15e/0x640 [ 34.807114] dev_queue_xmit+0x17/0x20 [ 34.810897] ? dev_queue_xmit+0x17/0x20 [ 34.814861] __bpf_redirect+0x5cf/0xb20 [ 34.818823] bpf_clone_redirect+0x2f6/0x490 [ 34.823133] bpf_prog_759a992c578a3894+0x741/0x1000 [ 34.828131] ? ctrl_build_family_msg+0x40/0xa0 [ 34.832696] ? lock_downgrade+0x900/0x900 [ 34.836847] ? ktime_get+0x352/0x440 [ 34.840552] ? find_held_lock+0x36/0x1c0 [ 34.844598] ? lock_acquire+0x1ed/0x520 [ 34.848554] ? bpf_test_run+0x32e/0x5a0 [ 34.852519] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.858046] ? check_preemption_disabled+0x48/0x200 [ 34.863050] ? kasan_check_read+0x11/0x20 [ 34.867202] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 34.872464] ? rcu_bh_qs+0xc0/0xc0 [ 34.875988] ? __build_skb+0x359/0x430 [ 34.879863] ? skb_try_coalesce+0x1b70/0x1b70 [ 34.884346] ? bpf_test_run+0x1c0/0x5a0 [ 34.888316] ? netlink_diag_dump+0x2a0/0x2a0 [ 34.892709] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 34.898230] ? bpf_test_init.isra.9+0x70/0x100 [ 34.902794] ? bpf_prog_test_run_skb+0x634/0xb40 [ 34.907542] ? bpf_test_finish.isra.8+0x1f0/0x1f0 [ 34.912367] ? bpf_prog_add+0x69/0xd0 [ 34.916153] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.921674] ? __bpf_prog_get+0x9b/0x290 [ 34.925718] ? bpf_test_finish.isra.8+0x1f0/0x1f0 [ 34.930541] ? bpf_prog_test_run+0x130/0x1a0 [ 34.934954] ? __x64_sys_bpf+0x3d8/0x510 [ 34.939016] ? bpf_prog_get+0x20/0x20 [ 34.942811] ? do_syscall_64+0x1b9/0x820 [ 34.946863] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 34.952213] ? syscall_return_slowpath+0x5e0/0x5e0 [ 34.957126] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.961971] ? trace_hardirqs_on_caller+0x310/0x310 [ 34.966970] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 34.971969] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.977489] ? prepare_exit_to_usermode+0x291/0x3b0 [ 34.982536] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.987374] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.993643] Kernel Offset: disabled [ 34.997263] Rebooting in 86400 seconds..