Warning: Permanently added '10.128.0.66' (ECDSA) to the list of known hosts. 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 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 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 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 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 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 executing program executing program executing program executing program executing program executing program syzkaller login: [ 62.544049][ T6973] ================================================================== [ 62.552325][ T6973] BUG: KASAN: use-after-free in tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 62.560907][ T6973] Read of size 2 at addr ffff8880938a0814 by task syz-executor924/6973 [ 62.569125][ T6973] [ 62.571444][ T6973] CPU: 1 PID: 6973 Comm: syz-executor924 Not tainted 5.8.0-rc2-syzkaller #0 [ 62.580256][ T6973] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.590301][ T6973] Call Trace: [ 62.593589][ T6973] dump_stack+0x18f/0x20d [ 62.597994][ T6973] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 62.604226][ T6973] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 62.610574][ T6973] print_address_description.constprop.0.cold+0xae/0x436 [ 62.617769][ T6973] ? do_raw_spin_lock+0x120/0x2b0 [ 62.622788][ T6973] ? vprintk_func+0x97/0x1a6 [ 62.627369][ T6973] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 62.633601][ T6973] kasan_report.cold+0x1f/0x37 [ 62.638359][ T6973] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 62.644698][ T6973] tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 62.650845][ T6973] ? tipc_nl_node_dump_monitor+0x300/0x300 [ 62.656711][ T6973] ? check_preemption_disabled+0x38/0x220 [ 62.662428][ T6973] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 62.667972][ T6973] ? __phys_addr+0x9a/0x110 [ 62.672619][ T6973] ? memset+0x20/0x40 [ 62.676799][ T6973] genl_lock_dumpit+0x7f/0xb0 [ 62.681479][ T6973] netlink_dump+0x4cd/0xf60 [ 62.686018][ T6973] ? netlink_insert+0x1670/0x1670 [ 62.691030][ T6973] ? __mutex_unlock_slowpath+0xe2/0x610 [ 62.696567][ T6973] ? genl_start+0x45a/0x6e0 [ 62.701079][ T6973] __netlink_dump_start+0x643/0x900 [ 62.706263][ T6973] ? genl_rcv_msg+0x9e0/0x9e0 [ 62.711029][ T6973] ? tipc_nl_node_dump_monitor+0x300/0x300 [ 62.716834][ T6973] genl_family_rcv_msg_dumpit+0x2ac/0x310 [ 62.722653][ T6973] ? genl_rcv+0x40/0x40 [ 62.726794][ T6973] ? mutex_lock_io_nested+0xf60/0xf60 [ 62.732151][ T6973] ? mark_lock+0xbc/0x1710 [ 62.736554][ T6973] ? genl_rcv_msg+0x9e0/0x9e0 [ 62.741239][ T6973] ? genl_unlock+0x20/0x20 [ 62.745641][ T6973] ? genl_parallel_done+0x170/0x170 [ 62.750897][ T6973] ? __radix_tree_lookup+0x1f3/0x290 [ 62.756192][ T6973] genl_rcv_msg+0x797/0x9e0 [ 62.760705][ T6973] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 62.767916][ T6973] ? lock_acquire+0x1f1/0xad0 [ 62.772605][ T6973] ? genl_rcv+0x15/0x40 [ 62.776864][ T6973] ? lock_release+0x8d0/0x8d0 [ 62.781572][ T6973] netlink_rcv_skb+0x15a/0x430 [ 62.786362][ T6973] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 62.793287][ T6973] ? netlink_ack+0xa10/0xa10 [ 62.797875][ T6973] genl_rcv+0x24/0x40 [ 62.801854][ T6973] netlink_unicast+0x533/0x7d0 [ 62.806795][ T6973] ? netlink_attachskb+0x810/0x810 [ 62.811890][ T6973] ? _copy_from_iter_full+0x247/0x890 [ 62.817255][ T6973] ? __phys_addr+0x9a/0x110 [ 62.821757][ T6973] ? __phys_addr_symbol+0x2c/0x70 [ 62.826771][ T6973] ? __check_object_size+0x171/0x3e4 [ 62.832133][ T6973] netlink_sendmsg+0x856/0xd90 [ 62.836887][ T6973] ? netlink_unicast+0x7d0/0x7d0 [ 62.841814][ T6973] ? netlink_unicast+0x7d0/0x7d0 [ 62.846847][ T6973] sock_sendmsg+0xcf/0x120 [ 62.851409][ T6973] ____sys_sendmsg+0x6e8/0x810 [ 62.856193][ T6973] ? kernel_sendmsg+0x50/0x50 [ 62.860864][ T6973] ? do_recvmmsg+0x6d0/0x6d0 [ 62.865459][ T6973] ? mark_lock+0xbc/0x1710 [ 62.869980][ T6973] ? __lock_acquire+0xc1e/0x56e0 [ 62.875953][ T6973] ___sys_sendmsg+0xf3/0x170 [ 62.880893][ T6973] ? sendmsg_copy_msghdr+0x160/0x160 [ 62.886563][ T6973] ? check_preemption_disabled+0x38/0x220 [ 62.892381][ T6973] ? percpu_counter_add_batch+0x126/0x180 [ 62.898091][ T6973] ? find_held_lock+0x2d/0x110 [ 62.903015][ T6973] ? __fd_install+0x1b4/0x600 [ 62.908468][ T6973] ? lock_downgrade+0x820/0x820 [ 62.913402][ T6973] ? __fget_light+0x215/0x280 [ 62.918080][ T6973] __sys_sendmsg+0xe5/0x1b0 [ 62.922961][ T6973] ? __sys_sendmsg_sock+0xb0/0xb0 [ 62.929420][ T6973] ? do_fast_syscall_32+0x40/0x120 [ 62.935851][ T6973] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 62.942285][ T6973] do_syscall_32_irqs_on+0x3f/0x60 [ 62.952134][ T6973] do_fast_syscall_32+0x7f/0x120 [ 62.957263][ T6973] entry_SYSENTER_compat+0x6d/0x7c [ 62.962622][ T6973] RIP: 0023:0xf7fc8569 [ 62.966688][ T6973] Code: Bad RIP value. [ 62.970913][ T6973] RSP: 002b:00000000ffa0e63c EFLAGS: 00000282 ORIG_RAX: 0000000000000172 [ 62.979304][ T6973] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000200000c0 [ 62.987262][ T6973] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00000000ffa0e754 [ 62.995332][ T6973] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 63.005812][ T6973] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 63.013773][ T6973] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 63.021738][ T6973] [ 63.024059][ T6973] Allocated by task 6975: [ 63.028382][ T6973] save_stack+0x1b/0x40 [ 63.032529][ T6973] __kasan_kmalloc.constprop.0+0xc2/0xd0 [ 63.038155][ T6973] __alloc_skb+0xae/0x550 [ 63.042478][ T6973] netlink_sendmsg+0x94f/0xd90 [ 63.047244][ T6973] sock_sendmsg+0xcf/0x120 [ 63.051669][ T6973] ____sys_sendmsg+0x6e8/0x810 [ 63.056466][ T6973] ___sys_sendmsg+0xf3/0x170 [ 63.061125][ T6973] __sys_sendmsg+0xe5/0x1b0 [ 63.065652][ T6973] do_syscall_32_irqs_on+0x3f/0x60 [ 63.070756][ T6973] do_fast_syscall_32+0x7f/0x120 [ 63.075778][ T6973] entry_SYSENTER_compat+0x6d/0x7c [ 63.080921][ T6973] [ 63.083263][ T6973] Freed by task 6975: [ 63.087269][ T6973] save_stack+0x1b/0x40 [ 63.091419][ T6973] __kasan_slab_free+0xf5/0x140 [ 63.096262][ T6973] kfree+0x103/0x2c0 [ 63.100150][ T6973] skb_release_data+0x6d9/0x910 [ 63.104996][ T6973] consume_skb+0xc2/0x160 [ 63.109309][ T6973] netlink_unicast+0x53b/0x7d0 [ 63.114242][ T6973] netlink_sendmsg+0x856/0xd90 [ 63.119028][ T6973] sock_sendmsg+0xcf/0x120 [ 63.123480][ T6973] ____sys_sendmsg+0x6e8/0x810 [ 63.128331][ T6973] ___sys_sendmsg+0xf3/0x170 [ 63.132923][ T6973] __sys_sendmsg+0xe5/0x1b0 [ 63.137419][ T6973] do_syscall_32_irqs_on+0x3f/0x60 [ 63.142518][ T6973] do_fast_syscall_32+0x7f/0x120 [ 63.147526][ T6973] entry_SYSENTER_compat+0x6d/0x7c [ 63.152609][ T6973] [ 63.154921][ T6973] The buggy address belongs to the object at ffff8880938a0800 [ 63.154921][ T6973] which belongs to the cache kmalloc-512 of size 512 [ 63.168954][ T6973] The buggy address is located 20 bytes inside of [ 63.168954][ T6973] 512-byte region [ffff8880938a0800, ffff8880938a0a00) [ 63.182526][ T6973] The buggy address belongs to the page: [ 63.188155][ T6973] page:ffffea00024e2800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 63.197443][ T6973] flags: 0xfffe0000000200(slab) [ 63.202280][ T6973] raw: 00fffe0000000200 ffffea00025eb708 ffffea0002a25588 ffff8880aa000a80 [ 63.210852][ T6973] raw: 0000000000000000 ffff8880938a0000 0000000100000004 0000000000000000 [ 63.219421][ T6973] page dumped because: kasan: bad access detected [ 63.225825][ T6973] [ 63.228576][ T6973] Memory state around the buggy address: [ 63.234240][ T6973] ffff8880938a0700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc executing program [ 63.242474][ T6973] ffff8880938a0780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 63.251056][ T6973] >ffff8880938a0800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.259288][ T6973] ^ [ 63.263880][ T6973] ffff8880938a0880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.271929][ T6973] ffff8880938a0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.279967][ T6973] ================================================================== [ 63.288012][ T6973] Disabling lock debugging due to kernel taint [ 63.317431][ T6973] Kernel panic - not syncing: panic_on_warn set ... [ 63.324068][ T6973] CPU: 1 PID: 6973 Comm: syz-executor924 Tainted: G B 5.8.0-rc2-syzkaller #0 [ 63.334268][ T6973] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.344531][ T6973] Call Trace: [ 63.347824][ T6973] dump_stack+0x18f/0x20d [ 63.352149][ T6973] ? tipc_nl_node_dump_monitor_peer+0x440/0x590 [ 63.358379][ T6973] panic+0x2e3/0x75c [ 63.362432][ T6973] ? __warn_printk+0xf3/0xf3 [ 63.367018][ T6973] ? preempt_schedule_common+0x59/0xc0 [ 63.372584][ T6973] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 63.378820][ T6973] ? preempt_schedule_thunk+0x16/0x18 [ 63.384280][ T6973] ? trace_hardirqs_on+0x55/0x220 [ 63.389452][ T6973] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 63.395677][ T6973] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 63.401978][ T6973] end_report+0x4d/0x53 [ 63.406136][ T6973] kasan_report.cold+0xd/0x37 [ 63.410798][ T6973] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 63.417138][ T6973] tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 63.423198][ T6973] ? tipc_nl_node_dump_monitor+0x300/0x300 [ 63.429016][ T6973] ? check_preemption_disabled+0x38/0x220 [ 63.434721][ T6973] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 63.440422][ T6973] ? __phys_addr+0x9a/0x110 [ 63.444919][ T6973] ? memset+0x20/0x40 [ 63.448886][ T6973] genl_lock_dumpit+0x7f/0xb0 [ 63.453545][ T6973] netlink_dump+0x4cd/0xf60 [ 63.458031][ T6973] ? netlink_insert+0x1670/0x1670 [ 63.463043][ T6973] ? __mutex_unlock_slowpath+0xe2/0x610 [ 63.468590][ T6973] ? genl_start+0x45a/0x6e0 [ 63.473083][ T6973] __netlink_dump_start+0x643/0x900 [ 63.478571][ T6973] ? genl_rcv_msg+0x9e0/0x9e0 [ 63.483273][ T6973] ? tipc_nl_node_dump_monitor+0x300/0x300 [ 63.489062][ T6973] genl_family_rcv_msg_dumpit+0x2ac/0x310 [ 63.494855][ T6973] ? genl_rcv+0x40/0x40 [ 63.499253][ T6973] ? mutex_lock_io_nested+0xf60/0xf60 [ 63.504795][ T6973] ? mark_lock+0xbc/0x1710 [ 63.509195][ T6973] ? genl_rcv_msg+0x9e0/0x9e0 [ 63.513859][ T6973] ? genl_unlock+0x20/0x20 [ 63.518270][ T6973] ? genl_parallel_done+0x170/0x170 [ 63.523454][ T6973] ? __radix_tree_lookup+0x1f3/0x290 [ 63.529069][ T6973] genl_rcv_msg+0x797/0x9e0 [ 63.533571][ T6973] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 63.540503][ T6973] ? lock_acquire+0x1f1/0xad0 [ 63.545175][ T6973] ? genl_rcv+0x15/0x40 [ 63.549323][ T6973] ? lock_release+0x8d0/0x8d0 [ 63.554076][ T6973] netlink_rcv_skb+0x15a/0x430 [ 63.558858][ T6973] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 63.565806][ T6973] ? netlink_ack+0xa10/0xa10 [ 63.570407][ T6973] genl_rcv+0x24/0x40 [ 63.574370][ T6973] netlink_unicast+0x533/0x7d0 [ 63.579118][ T6973] ? netlink_attachskb+0x810/0x810 [ 63.584229][ T6973] ? _copy_from_iter_full+0x247/0x890 [ 63.589583][ T6973] ? __phys_addr+0x9a/0x110 [ 63.594069][ T6973] ? __phys_addr_symbol+0x2c/0x70 [ 63.599076][ T6973] ? __check_object_size+0x171/0x3e4 [ 63.604374][ T6973] netlink_sendmsg+0x856/0xd90 [ 63.609141][ T6973] ? netlink_unicast+0x7d0/0x7d0 [ 63.614072][ T6973] ? netlink_unicast+0x7d0/0x7d0 [ 63.618998][ T6973] sock_sendmsg+0xcf/0x120 [ 63.623396][ T6973] ____sys_sendmsg+0x6e8/0x810 [ 63.628172][ T6973] ? kernel_sendmsg+0x50/0x50 [ 63.632845][ T6973] ? do_recvmmsg+0x6d0/0x6d0 [ 63.637419][ T6973] ? mark_lock+0xbc/0x1710 [ 63.642132][ T6973] ? __lock_acquire+0xc1e/0x56e0 [ 63.647063][ T6973] ___sys_sendmsg+0xf3/0x170 [ 63.651646][ T6973] ? sendmsg_copy_msghdr+0x160/0x160 [ 63.656952][ T6973] ? check_preemption_disabled+0x38/0x220 [ 63.662940][ T6973] ? percpu_counter_add_batch+0x126/0x180 [ 63.668672][ T6973] ? find_held_lock+0x2d/0x110 [ 63.673415][ T6973] ? __fd_install+0x1b4/0x600 [ 63.678075][ T6973] ? lock_downgrade+0x820/0x820 [ 63.682931][ T6973] ? __fget_light+0x215/0x280 [ 63.687622][ T6973] __sys_sendmsg+0xe5/0x1b0 [ 63.692268][ T6973] ? __sys_sendmsg_sock+0xb0/0xb0 [ 63.697278][ T6973] ? do_fast_syscall_32+0x40/0x120 [ 63.702383][ T6973] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 63.708889][ T6973] do_syscall_32_irqs_on+0x3f/0x60 [ 63.714035][ T6973] do_fast_syscall_32+0x7f/0x120 [ 63.718969][ T6973] entry_SYSENTER_compat+0x6d/0x7c [ 63.724150][ T6973] RIP: 0023:0xf7fc8569 [ 63.728191][ T6973] Code: Bad RIP value. [ 63.732283][ T6973] RSP: 002b:00000000ffa0e63c EFLAGS: 00000282 ORIG_RAX: 0000000000000172 [ 63.740854][ T6973] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000200000c0 [ 63.748828][ T6973] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00000000ffa0e754 [ 63.756888][ T6973] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 63.764852][ T6973] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 63.773139][ T6973] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 63.782743][ T6973] Kernel Offset: disabled [ 63.787075][ T6973] Rebooting in 86400 seconds..