[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.6' (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 syzkaller login: [ 61.014984][ T6896] ================================================================== [ 61.023239][ T6896] BUG: KASAN: use-after-free in tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 61.031826][ T6896] Read of size 2 at addr ffff8880a77e6414 by task syz-executor883/6896 [ 61.040051][ T6896] [ 61.042380][ T6896] CPU: 1 PID: 6896 Comm: syz-executor883 Not tainted 5.8.0-rc3-syzkaller #0 [ 61.051111][ T6896] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.061141][ T6896] Call Trace: [ 61.064413][ T6896] dump_stack+0x18f/0x20d [ 61.068728][ T6896] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 61.074945][ T6896] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 61.081161][ T6896] print_address_description.constprop.0.cold+0xae/0x436 [ 61.088174][ T6896] ? do_raw_spin_lock+0x120/0x2b0 [ 61.093190][ T6896] ? lockdep_hardirqs_off+0x66/0xa0 [ 61.098394][ T6896] ? vprintk_func+0x97/0x1a6 [ 61.102964][ T6896] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 61.109179][ T6896] kasan_report.cold+0x1f/0x37 [ 61.113924][ T6896] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 61.120141][ T6896] tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 61.126187][ T6896] ? tipc_nl_node_dump_monitor+0x300/0x300 [ 61.131984][ T6896] ? lock_is_held_type+0xb0/0xe0 [ 61.136902][ T6896] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 61.142427][ T6896] ? kmem_cache_alloc_node_trace+0x3b0/0x400 [ 61.148407][ T6896] ? __kmalloc_node_track_caller+0x38/0x60 [ 61.154209][ T6896] ? kasan_unpoison_shadow+0x33/0x40 [ 61.159481][ T6896] ? __phys_addr+0x9a/0x110 [ 61.163962][ T6896] ? memset+0x20/0x40 [ 61.167933][ T6896] genl_lock_dumpit+0x7f/0xb0 [ 61.172604][ T6896] netlink_dump+0x4cd/0xf60 [ 61.177096][ T6896] ? netlink_insert+0x1670/0x1670 [ 61.182096][ T6896] ? __mutex_unlock_slowpath+0xe2/0x610 [ 61.187630][ T6896] ? genl_start+0x45a/0x6e0 [ 61.192112][ T6896] __netlink_dump_start+0x643/0x900 [ 61.197286][ T6896] ? genl_rcv_msg+0x9e0/0x9e0 [ 61.201958][ T6896] ? tipc_nl_node_dump_monitor+0x300/0x300 [ 61.207752][ T6896] genl_family_rcv_msg_dumpit+0x2ac/0x310 [ 61.213460][ T6896] ? genl_rcv+0x40/0x40 [ 61.217593][ T6896] ? mutex_lock_io_nested+0xf60/0xf60 [ 61.222942][ T6896] ? mark_lock+0xbc/0x1710 [ 61.227342][ T6896] ? genl_rcv_msg+0x9e0/0x9e0 [ 61.232000][ T6896] ? genl_unlock+0x20/0x20 [ 61.236400][ T6896] ? genl_parallel_done+0x170/0x170 [ 61.241575][ T6896] ? __radix_tree_lookup+0x1f3/0x290 [ 61.246852][ T6896] genl_rcv_msg+0x797/0x9e0 [ 61.251361][ T6896] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 61.258295][ T6896] ? lock_acquire+0x1f1/0xad0 [ 61.262964][ T6896] ? genl_rcv+0x15/0x40 [ 61.267102][ T6896] ? lock_release+0x8d0/0x8d0 [ 61.271770][ T6896] netlink_rcv_skb+0x15a/0x430 [ 61.276529][ T6896] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 61.283440][ T6896] ? netlink_ack+0xa10/0xa10 [ 61.288014][ T6896] genl_rcv+0x24/0x40 [ 61.291972][ T6896] netlink_unicast+0x533/0x7d0 [ 61.296715][ T6896] ? netlink_attachskb+0x810/0x810 [ 61.301802][ T6896] ? _copy_from_iter_full+0x247/0x890 [ 61.307150][ T6896] ? __phys_addr+0x9a/0x110 [ 61.311630][ T6896] ? __phys_addr_symbol+0x2c/0x70 [ 61.316633][ T6896] ? __check_object_size+0x171/0x3e4 [ 61.321897][ T6896] netlink_sendmsg+0x856/0xd90 [ 61.326641][ T6896] ? netlink_unicast+0x7d0/0x7d0 [ 61.331558][ T6896] ? netlink_unicast+0x7d0/0x7d0 [ 61.336486][ T6896] sock_sendmsg+0xcf/0x120 [ 61.340891][ T6896] ____sys_sendmsg+0x6e8/0x810 [ 61.345635][ T6896] ? kernel_sendmsg+0x50/0x50 [ 61.350288][ T6896] ? do_recvmmsg+0x6d0/0x6d0 [ 61.354897][ T6896] ? find_held_lock+0x2d/0x110 [ 61.359679][ T6896] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 61.365646][ T6896] ? lock_downgrade+0x820/0x820 [ 61.370495][ T6896] ___sys_sendmsg+0xf3/0x170 [ 61.375071][ T6896] ? sendmsg_copy_msghdr+0x160/0x160 [ 61.380337][ T6896] ? debug_object_active_state+0x260/0x350 [ 61.386146][ T6896] ? lock_downgrade+0x820/0x820 [ 61.390991][ T6896] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 61.396814][ T6896] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 61.402815][ T6896] ? trace_hardirqs_on+0x5f/0x220 [ 61.407831][ T6896] ? lockdep_hardirqs_on+0x6a/0xe0 [ 61.412936][ T6896] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 61.418721][ T6896] ? debug_object_active_state+0x260/0x350 [ 61.424507][ T6896] ? check_preemption_disabled+0x50/0x130 [ 61.430203][ T6896] ? __fget_light+0x215/0x280 [ 61.434859][ T6896] __sys_sendmsg+0xe5/0x1b0 [ 61.439343][ T6896] ? __sys_sendmsg_sock+0xb0/0xb0 [ 61.444349][ T6896] ? lock_is_held_type+0xb0/0xe0 [ 61.449297][ T6896] ? do_syscall_64+0x1c/0xe0 [ 61.453865][ T6896] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 61.459924][ T6896] do_syscall_64+0x60/0xe0 [ 61.464339][ T6896] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.470227][ T6896] RIP: 0033:0x4452a9 [ 61.474108][ T6896] Code: Bad RIP value. [ 61.478150][ T6896] RSP: 002b:00007ffecb8121c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 61.486533][ T6896] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004452a9 [ 61.494480][ T6896] RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003 [ 61.502441][ T6896] RBP: 000000000000ee3d R08: 0000000000000000 R09: 00000000004002e0 [ 61.510386][ T6896] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402440 [ 61.518332][ T6896] R13: 00000000004024d0 R14: 0000000000000000 R15: 0000000000000000 [ 61.526284][ T6896] [ 61.528587][ T6896] Allocated by task 6895: [ 61.532892][ T6896] save_stack+0x1b/0x40 [ 61.537038][ T6896] __kasan_kmalloc.constprop.0+0xc2/0xd0 [ 61.542660][ T6896] __alloc_skb+0xae/0x550 [ 61.546973][ T6896] netlink_sendmsg+0x94f/0xd90 [ 61.551720][ T6896] sock_sendmsg+0xcf/0x120 [ 61.556111][ T6896] ____sys_sendmsg+0x6e8/0x810 [ 61.560849][ T6896] ___sys_sendmsg+0xf3/0x170 [ 61.565414][ T6896] __sys_sendmsg+0xe5/0x1b0 [ 61.569891][ T6896] do_syscall_64+0x60/0xe0 [ 61.574282][ T6896] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.580142][ T6896] [ 61.582446][ T6896] Freed by task 6895: [ 61.586413][ T6896] save_stack+0x1b/0x40 [ 61.590568][ T6896] __kasan_slab_free+0xf5/0x140 [ 61.595392][ T6896] kfree+0x103/0x2c0 [ 61.599264][ T6896] skb_release_data+0x6d9/0x910 [ 61.604087][ T6896] consume_skb+0xc2/0x160 [ 61.608393][ T6896] netlink_unicast+0x53b/0x7d0 [ 61.613131][ T6896] netlink_sendmsg+0x856/0xd90 [ 61.617872][ T6896] sock_sendmsg+0xcf/0x120 [ 61.622278][ T6896] ____sys_sendmsg+0x6e8/0x810 [ 61.627023][ T6896] ___sys_sendmsg+0xf3/0x170 [ 61.631608][ T6896] __sys_sendmsg+0xe5/0x1b0 [ 61.636108][ T6896] do_syscall_64+0x60/0xe0 [ 61.640527][ T6896] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.646405][ T6896] [ 61.648712][ T6896] The buggy address belongs to the object at ffff8880a77e6400 [ 61.648712][ T6896] which belongs to the cache kmalloc-512 of size 512 [ 61.662735][ T6896] The buggy address is located 20 bytes inside of [ 61.662735][ T6896] 512-byte region [ffff8880a77e6400, ffff8880a77e6600) [ 61.675888][ T6896] The buggy address belongs to the page: [ 61.681499][ T6896] page:ffffea00029df980 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 61.690578][ T6896] flags: 0xfffe0000000200(slab) [ 61.695408][ T6896] raw: 00fffe0000000200 ffffea00024facc8 ffff8880aa001750 ffff8880aa000a80 [ 61.703981][ T6896] raw: 0000000000000000 ffff8880a77e6000 0000000100000004 0000000000000000 [ 61.712546][ T6896] page dumped because: kasan: bad access detected [ 61.718928][ T6896] [ 61.721228][ T6896] Memory state around the buggy address: [ 61.726834][ T6896] ffff8880a77e6300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 61.734870][ T6896] ffff8880a77e6380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 61.742920][ T6896] >ffff8880a77e6400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.750953][ T6896] ^ [ 61.755517][ T6896] ffff8880a77e6480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.763567][ T6896] ffff8880a77e6500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.771646][ T6896] ================================================================== [ 61.779726][ T6896] Disabling lock debugging due to kernel taint [ 61.789537][ T6896] Kernel panic - not syncing: panic_on_warn set ... [ 61.796136][ T6896] CPU: 1 PID: 6896 Comm: syz-executor883 Tainted: G B 5.8.0-rc3-syzkaller #0 [ 61.806181][ T6896] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.816224][ T6896] Call Trace: [ 61.819508][ T6896] dump_stack+0x18f/0x20d [ 61.823841][ T6896] ? tipc_nl_node_dump_monitor_peer+0x3e0/0x590 [ 61.830084][ T6896] panic+0x2e3/0x75c [ 61.833997][ T6896] ? __warn_printk+0xf3/0xf3 [ 61.838583][ T6896] ? preempt_schedule_common+0x59/0xc0 [ 61.844029][ T6896] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 61.850372][ T6896] ? preempt_schedule_thunk+0x16/0x18 [ 61.855716][ T6896] ? trace_hardirqs_on+0x55/0x220 [ 61.860719][ T6896] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 61.866941][ T6896] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 61.873163][ T6896] end_report+0x4d/0x53 [ 61.877296][ T6896] kasan_report.cold+0xd/0x37 [ 61.881947][ T6896] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 61.888160][ T6896] tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 61.894199][ T6896] ? tipc_nl_node_dump_monitor+0x300/0x300 [ 61.899983][ T6896] ? lock_is_held_type+0xb0/0xe0 [ 61.904901][ T6896] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 61.910421][ T6896] ? kmem_cache_alloc_node_trace+0x3b0/0x400 [ 61.916393][ T6896] ? __kmalloc_node_track_caller+0x38/0x60 [ 61.922179][ T6896] ? kasan_unpoison_shadow+0x33/0x40 [ 61.927448][ T6896] ? __phys_addr+0x9a/0x110 [ 61.931939][ T6896] ? memset+0x20/0x40 [ 61.935897][ T6896] genl_lock_dumpit+0x7f/0xb0 [ 61.940560][ T6896] netlink_dump+0x4cd/0xf60 [ 61.945035][ T6896] ? netlink_insert+0x1670/0x1670 [ 61.950037][ T6896] ? __mutex_unlock_slowpath+0xe2/0x610 [ 61.955617][ T6896] ? genl_start+0x45a/0x6e0 [ 61.960116][ T6896] __netlink_dump_start+0x643/0x900 [ 61.965298][ T6896] ? genl_rcv_msg+0x9e0/0x9e0 [ 61.969947][ T6896] ? tipc_nl_node_dump_monitor+0x300/0x300 [ 61.975734][ T6896] genl_family_rcv_msg_dumpit+0x2ac/0x310 [ 61.981440][ T6896] ? genl_rcv+0x40/0x40 [ 61.985569][ T6896] ? mutex_lock_io_nested+0xf60/0xf60 [ 61.990914][ T6896] ? mark_lock+0xbc/0x1710 [ 61.995309][ T6896] ? genl_rcv_msg+0x9e0/0x9e0 [ 61.999956][ T6896] ? genl_unlock+0x20/0x20 [ 62.004358][ T6896] ? genl_parallel_done+0x170/0x170 [ 62.009537][ T6896] ? __radix_tree_lookup+0x1f3/0x290 [ 62.014808][ T6896] genl_rcv_msg+0x797/0x9e0 [ 62.019287][ T6896] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 62.026195][ T6896] ? lock_acquire+0x1f1/0xad0 [ 62.030842][ T6896] ? genl_rcv+0x15/0x40 [ 62.034970][ T6896] ? lock_release+0x8d0/0x8d0 [ 62.039620][ T6896] netlink_rcv_skb+0x15a/0x430 [ 62.044356][ T6896] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 62.051273][ T6896] ? netlink_ack+0xa10/0xa10 [ 62.055853][ T6896] genl_rcv+0x24/0x40 [ 62.059822][ T6896] netlink_unicast+0x533/0x7d0 [ 62.064559][ T6896] ? netlink_attachskb+0x810/0x810 [ 62.069646][ T6896] ? _copy_from_iter_full+0x247/0x890 [ 62.074989][ T6896] ? __phys_addr+0x9a/0x110 [ 62.079464][ T6896] ? __phys_addr_symbol+0x2c/0x70 [ 62.084474][ T6896] ? __check_object_size+0x171/0x3e4 [ 62.090263][ T6896] netlink_sendmsg+0x856/0xd90 [ 62.095024][ T6896] ? netlink_unicast+0x7d0/0x7d0 [ 62.099947][ T6896] ? netlink_unicast+0x7d0/0x7d0 [ 62.104862][ T6896] sock_sendmsg+0xcf/0x120 [ 62.109253][ T6896] ____sys_sendmsg+0x6e8/0x810 [ 62.114005][ T6896] ? kernel_sendmsg+0x50/0x50 [ 62.118652][ T6896] ? do_recvmmsg+0x6d0/0x6d0 [ 62.123214][ T6896] ? find_held_lock+0x2d/0x110 [ 62.127961][ T6896] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 62.133924][ T6896] ? lock_downgrade+0x820/0x820 [ 62.138761][ T6896] ___sys_sendmsg+0xf3/0x170 [ 62.143325][ T6896] ? sendmsg_copy_msghdr+0x160/0x160 [ 62.148584][ T6896] ? debug_object_active_state+0x260/0x350 [ 62.154383][ T6896] ? lock_downgrade+0x820/0x820 [ 62.159209][ T6896] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 62.164998][ T6896] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 62.170963][ T6896] ? trace_hardirqs_on+0x5f/0x220 [ 62.175962][ T6896] ? lockdep_hardirqs_on+0x6a/0xe0 [ 62.181045][ T6896] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 62.186834][ T6896] ? debug_object_active_state+0x260/0x350 [ 62.192624][ T6896] ? check_preemption_disabled+0x50/0x130 [ 62.198315][ T6896] ? __fget_light+0x215/0x280 [ 62.202978][ T6896] __sys_sendmsg+0xe5/0x1b0 [ 62.207466][ T6896] ? __sys_sendmsg_sock+0xb0/0xb0 [ 62.212470][ T6896] ? lock_is_held_type+0xb0/0xe0 [ 62.217391][ T6896] ? do_syscall_64+0x1c/0xe0 [ 62.221967][ T6896] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 62.227928][ T6896] do_syscall_64+0x60/0xe0 [ 62.232340][ T6896] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 62.238227][ T6896] RIP: 0033:0x4452a9 [ 62.242123][ T6896] Code: Bad RIP value. [ 62.246197][ T6896] RSP: 002b:00007ffecb8121c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 62.254610][ T6896] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004452a9 [ 62.262564][ T6896] RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003 [ 62.270519][ T6896] RBP: 000000000000ee3d R08: 0000000000000000 R09: 00000000004002e0 [ 62.278462][ T6896] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402440 [ 62.286430][ T6896] R13: 00000000004024d0 R14: 0000000000000000 R15: 0000000000000000 [ 62.295454][ T6896] Kernel Offset: disabled [ 62.299767][ T6896] Rebooting in 86400 seconds..