[ 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 '10.128.0.21' (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 syzkaller login: [ 83.260605][ T28] audit: type=1400 audit(1594135813.439:8): avc: denied { execmem } for pid=6811 comm="syz-executor382" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 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 [ 83.549245][ T6913] ================================================================== [ 83.557515][ T6913] BUG: KASAN: use-after-free in tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 83.566143][ T6913] Read of size 2 at addr ffff88808f111814 by task syz-executor382/6913 [ 83.574361][ T6913] [ 83.576684][ T6913] CPU: 1 PID: 6913 Comm: syz-executor382 Not tainted 5.8.0-rc3-syzkaller #0 [ 83.585331][ T6913] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.595367][ T6913] Call Trace: [ 83.598648][ T6913] dump_stack+0x18f/0x20d [ 83.602964][ T6913] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 83.609203][ T6913] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 83.615427][ T6913] print_address_description.constprop.0.cold+0xae/0x436 [ 83.622443][ T6913] ? ____sys_sendmsg+0x6e8/0x810 [ 83.627383][ T6913] ? ___sys_sendmsg+0xf3/0x170 [ 83.632133][ T6913] ? __sys_sendmsg+0xe5/0x1b0 [ 83.636896][ T6913] ? lockdep_hardirqs_off+0x66/0xa0 [ 83.642091][ T6913] ? vprintk_func+0x97/0x1a6 [ 83.646682][ T6913] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 83.652919][ T6913] kasan_report.cold+0x1f/0x37 [ 83.657682][ T6913] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 83.663911][ T6913] tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 83.669983][ T6913] ? tipc_nl_node_dump_monitor+0x300/0x300 [ 83.675775][ T6913] ? lock_is_held_type+0xb0/0xe0 [ 83.680702][ T6913] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 83.686235][ T6913] ? kmem_cache_alloc_node_trace+0x3b0/0x400 [ 83.693098][ T6913] ? __kmalloc_node_track_caller+0x38/0x60 [ 83.698886][ T6913] ? kasan_unpoison_shadow+0x33/0x40 [ 83.704202][ T6913] ? __phys_addr+0x9a/0x110 [ 83.708705][ T6913] ? memset+0x20/0x40 [ 83.712688][ T6913] genl_lock_dumpit+0x7f/0xb0 [ 83.717344][ T6913] netlink_dump+0x4cd/0xf60 [ 83.721825][ T6913] ? netlink_insert+0x1670/0x1670 [ 83.726828][ T6913] ? __mutex_unlock_slowpath+0xe2/0x610 [ 83.735480][ T6913] ? genl_start+0x45a/0x6e0 [ 83.739963][ T6913] __netlink_dump_start+0x643/0x900 [ 83.745145][ T6913] ? genl_rcv_msg+0x9e0/0x9e0 [ 83.749806][ T6913] ? tipc_nl_node_dump_monitor+0x300/0x300 [ 83.755590][ T6913] genl_family_rcv_msg_dumpit+0x2ac/0x310 [ 83.761380][ T6913] ? genl_rcv+0x40/0x40 [ 83.765523][ T6913] ? mutex_lock_io_nested+0xf60/0xf60 [ 83.770900][ T6913] ? mark_lock+0xbc/0x1710 [ 83.775394][ T6913] ? genl_rcv_msg+0x9e0/0x9e0 [ 83.780056][ T6913] ? genl_unlock+0x20/0x20 [ 83.784451][ T6913] ? genl_parallel_done+0x170/0x170 [ 83.789639][ T6913] ? __radix_tree_lookup+0x1f3/0x290 [ 83.794904][ T6913] genl_rcv_msg+0x797/0x9e0 [ 83.799391][ T6913] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 83.806317][ T6913] ? lock_acquire+0x1f1/0xad0 [ 83.810972][ T6913] ? genl_rcv+0x15/0x40 [ 83.815109][ T6913] ? lock_release+0x8d0/0x8d0 [ 83.819767][ T6913] netlink_rcv_skb+0x15a/0x430 [ 83.824517][ T6913] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 83.831428][ T6913] ? netlink_ack+0xa10/0xa10 [ 83.836026][ T6913] genl_rcv+0x24/0x40 [ 83.840013][ T6913] netlink_unicast+0x533/0x7d0 [ 83.844764][ T6913] ? netlink_attachskb+0x810/0x810 [ 83.849849][ T6913] ? _copy_from_iter_full+0x247/0x890 [ 83.855204][ T6913] netlink_sendmsg+0x856/0xd90 [ 83.859963][ T6913] ? netlink_unicast+0x7d0/0x7d0 [ 83.864891][ T6913] ? netlink_unicast+0x7d0/0x7d0 [ 83.869807][ T6913] sock_sendmsg+0xcf/0x120 [ 83.874215][ T6913] ____sys_sendmsg+0x6e8/0x810 [ 83.878960][ T6913] ? kernel_sendmsg+0x50/0x50 [ 83.883629][ T6913] ? do_recvmmsg+0x6d0/0x6d0 [ 83.888195][ T6913] ? find_held_lock+0x2d/0x110 [ 83.892938][ T6913] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 83.898895][ T6913] ? lock_downgrade+0x820/0x820 [ 83.903725][ T6913] ___sys_sendmsg+0xf3/0x170 [ 83.908295][ T6913] ? sendmsg_copy_msghdr+0x160/0x160 [ 83.913558][ T6913] ? debug_object_active_state+0x260/0x350 [ 83.919345][ T6913] ? lock_downgrade+0x820/0x820 [ 83.924192][ T6913] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 83.929986][ T6913] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 83.935963][ T6913] ? trace_hardirqs_on+0x5f/0x220 [ 83.940982][ T6913] ? lockdep_hardirqs_on+0x6a/0xe0 [ 83.946072][ T6913] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 83.951859][ T6913] ? debug_object_active_state+0x260/0x350 [ 83.957646][ T6913] ? check_preemption_disabled+0x50/0x130 [ 83.963351][ T6913] ? __fget_light+0x215/0x280 [ 83.968010][ T6913] __sys_sendmsg+0xe5/0x1b0 [ 83.972496][ T6913] ? __sys_sendmsg_sock+0xb0/0xb0 [ 83.977500][ T6913] ? lock_is_held_type+0xb0/0xe0 [ 83.982432][ T6913] ? do_syscall_64+0x1c/0xe0 [ 83.987006][ T6913] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 83.993058][ T6913] do_syscall_64+0x60/0xe0 [ 83.997458][ T6913] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 84.003339][ T6913] RIP: 0033:0x4452c9 [ 84.007219][ T6913] Code: Bad RIP value. [ 84.011260][ T6913] RSP: 002b:00007ffeec32d0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 84.019690][ T6913] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004452c9 [ 84.028371][ T6913] RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003 [ 84.036328][ T6913] RBP: 0000000000014653 R08: 0000000000000000 R09: 00000000004002e0 [ 84.044284][ T6913] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402460 [ 84.052262][ T6913] R13: 00000000004024f0 R14: 0000000000000000 R15: 0000000000000000 [ 84.060250][ T6913] [ 84.062559][ T6913] Allocated by task 6910: [ 84.066883][ T6913] save_stack+0x1b/0x40 [ 84.071019][ T6913] __kasan_kmalloc.constprop.0+0xc2/0xd0 [ 84.076645][ T6913] __alloc_skb+0xae/0x550 [ 84.080973][ T6913] netlink_sendmsg+0x94f/0xd90 [ 84.085732][ T6913] sock_sendmsg+0xcf/0x120 [ 84.090220][ T6913] ____sys_sendmsg+0x6e8/0x810 [ 84.094985][ T6913] ___sys_sendmsg+0xf3/0x170 [ 84.099552][ T6913] __sys_sendmsg+0xe5/0x1b0 [ 84.104033][ T6913] do_syscall_64+0x60/0xe0 [ 84.108427][ T6913] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 84.114312][ T6913] [ 84.116630][ T6913] Freed by task 6910: [ 84.120607][ T6913] save_stack+0x1b/0x40 [ 84.124746][ T6913] __kasan_slab_free+0xf5/0x140 [ 84.129572][ T6913] kfree+0x103/0x2c0 [ 84.133441][ T6913] skb_release_data+0x6d9/0x910 [ 84.138266][ T6913] consume_skb+0xc2/0x160 [ 84.142574][ T6913] netlink_unicast+0x53b/0x7d0 [ 84.147316][ T6913] netlink_sendmsg+0x856/0xd90 [ 84.152062][ T6913] sock_sendmsg+0xcf/0x120 [ 84.156466][ T6913] ____sys_sendmsg+0x6e8/0x810 [ 84.161207][ T6913] ___sys_sendmsg+0xf3/0x170 [ 84.165802][ T6913] __sys_sendmsg+0xe5/0x1b0 [ 84.170310][ T6913] do_syscall_64+0x60/0xe0 [ 84.174797][ T6913] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 84.180750][ T6913] [ 84.183060][ T6913] The buggy address belongs to the object at ffff88808f111800 [ 84.183060][ T6913] which belongs to the cache kmalloc-512 of size 512 [ 84.197111][ T6913] The buggy address is located 20 bytes inside of [ 84.197111][ T6913] 512-byte region [ffff88808f111800, ffff88808f111a00) [ 84.210273][ T6913] The buggy address belongs to the page: [ 84.215906][ T6913] page:ffffea00023c4440 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 84.225015][ T6913] flags: 0xfffe0000000200(slab) [ 84.229850][ T6913] raw: 00fffe0000000200 ffffea00023ca208 ffffea00023c0248 ffff8880aa000a80 [ 84.238435][ T6913] raw: 0000000000000000 ffff88808f111000 0000000100000004 0000000000000000 [ 84.247008][ T6913] page dumped because: kasan: bad access detected [ 84.253522][ T6913] [ 84.255839][ T6913] Memory state around the buggy address: [ 84.261460][ T6913] ffff88808f111700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 84.269605][ T6913] ffff88808f111780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 84.277650][ T6913] >ffff88808f111800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 84.285689][ T6913] ^ [ 84.290282][ T6913] ffff88808f111880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb executing program [ 84.298327][ T6913] ffff88808f111900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 84.306383][ T6913] ================================================================== [ 84.314421][ T6913] Disabling lock debugging due to kernel taint [ 84.334327][ T6913] Kernel panic - not syncing: panic_on_warn set ... [ 84.340958][ T6913] CPU: 1 PID: 6913 Comm: syz-executor382 Tainted: G B 5.8.0-rc3-syzkaller #0 [ 84.351007][ T6913] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 84.361078][ T6913] Call Trace: [ 84.364372][ T6913] dump_stack+0x18f/0x20d [ 84.368702][ T6913] ? tipc_nl_node_dump_monitor_peer+0x3e0/0x590 [ 84.374949][ T6913] panic+0x2e3/0x75c [ 84.378829][ T6913] ? __warn_printk+0xf3/0xf3 [ 84.383418][ T6913] ? preempt_schedule_common+0x59/0xc0 [ 84.389909][ T6913] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 84.396235][ T6913] ? preempt_schedule_thunk+0x16/0x18 [ 84.401581][ T6913] ? trace_hardirqs_on+0x55/0x220 [ 84.406590][ T6913] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 84.412817][ T6913] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 84.419036][ T6913] end_report+0x4d/0x53 [ 84.423169][ T6913] kasan_report.cold+0xd/0x37 [ 84.427852][ T6913] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 84.434077][ T6913] tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 84.440143][ T6913] ? tipc_nl_node_dump_monitor+0x300/0x300 [ 84.445930][ T6913] ? lock_is_held_type+0xb0/0xe0 [ 84.450847][ T6913] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 84.456413][ T6913] ? kmem_cache_alloc_node_trace+0x3b0/0x400 [ 84.462384][ T6913] ? __kmalloc_node_track_caller+0x38/0x60 [ 84.468181][ T6913] ? kasan_unpoison_shadow+0x33/0x40 [ 84.473458][ T6913] ? __phys_addr+0x9a/0x110 [ 84.477949][ T6913] ? memset+0x20/0x40 [ 84.481906][ T6913] genl_lock_dumpit+0x7f/0xb0 [ 84.486570][ T6913] netlink_dump+0x4cd/0xf60 [ 84.491048][ T6913] ? netlink_insert+0x1670/0x1670 [ 84.496054][ T6913] ? __mutex_unlock_slowpath+0xe2/0x610 [ 84.501616][ T6913] ? genl_start+0x45a/0x6e0 [ 84.506108][ T6913] __netlink_dump_start+0x643/0x900 [ 84.511283][ T6913] ? genl_rcv_msg+0x9e0/0x9e0 [ 84.515974][ T6913] ? tipc_nl_node_dump_monitor+0x300/0x300 [ 84.521765][ T6913] genl_family_rcv_msg_dumpit+0x2ac/0x310 [ 84.527504][ T6913] ? genl_rcv+0x40/0x40 [ 84.531645][ T6913] ? mutex_lock_io_nested+0xf60/0xf60 [ 84.537003][ T6913] ? mark_lock+0xbc/0x1710 [ 84.541416][ T6913] ? genl_rcv_msg+0x9e0/0x9e0 [ 84.546082][ T6913] ? genl_unlock+0x20/0x20 [ 84.550470][ T6913] ? genl_parallel_done+0x170/0x170 [ 84.555667][ T6913] ? __radix_tree_lookup+0x1f3/0x290 [ 84.560936][ T6913] genl_rcv_msg+0x797/0x9e0 [ 84.565417][ T6913] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 84.572333][ T6913] ? lock_acquire+0x1f1/0xad0 [ 84.577166][ T6913] ? genl_rcv+0x15/0x40 [ 84.581308][ T6913] ? lock_release+0x8d0/0x8d0 [ 84.585969][ T6913] netlink_rcv_skb+0x15a/0x430 [ 84.590707][ T6913] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 84.597614][ T6913] ? netlink_ack+0xa10/0xa10 [ 84.602205][ T6913] genl_rcv+0x24/0x40 [ 84.606160][ T6913] netlink_unicast+0x533/0x7d0 [ 84.610914][ T6913] ? netlink_attachskb+0x810/0x810 [ 84.615999][ T6913] ? _copy_from_iter_full+0x247/0x890 [ 84.621361][ T6913] netlink_sendmsg+0x856/0xd90 [ 84.626115][ T6913] ? netlink_unicast+0x7d0/0x7d0 [ 84.631180][ T6913] ? netlink_unicast+0x7d0/0x7d0 [ 84.636131][ T6913] sock_sendmsg+0xcf/0x120 [ 84.640527][ T6913] ____sys_sendmsg+0x6e8/0x810 [ 84.645405][ T6913] ? kernel_sendmsg+0x50/0x50 [ 84.650055][ T6913] ? do_recvmmsg+0x6d0/0x6d0 [ 84.654634][ T6913] ? find_held_lock+0x2d/0x110 [ 84.659434][ T6913] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 84.665412][ T6913] ? lock_downgrade+0x820/0x820 [ 84.670239][ T6913] ___sys_sendmsg+0xf3/0x170 [ 84.675423][ T6913] ? sendmsg_copy_msghdr+0x160/0x160 [ 84.680743][ T6913] ? debug_object_active_state+0x260/0x350 [ 84.686527][ T6913] ? lock_downgrade+0x820/0x820 [ 84.691355][ T6913] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 84.697168][ T6913] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 84.703150][ T6913] ? trace_hardirqs_on+0x5f/0x220 [ 84.708163][ T6913] ? lockdep_hardirqs_on+0x6a/0xe0 [ 84.713263][ T6913] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 84.719063][ T6913] ? debug_object_active_state+0x260/0x350 [ 84.724855][ T6913] ? check_preemption_disabled+0x50/0x130 [ 84.730563][ T6913] ? __fget_light+0x215/0x280 [ 84.735234][ T6913] __sys_sendmsg+0xe5/0x1b0 [ 84.739712][ T6913] ? __sys_sendmsg_sock+0xb0/0xb0 [ 84.744742][ T6913] ? lock_is_held_type+0xb0/0xe0 [ 84.749660][ T6913] ? do_syscall_64+0x1c/0xe0 [ 84.754226][ T6913] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 84.760193][ T6913] do_syscall_64+0x60/0xe0 [ 84.764587][ T6913] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 84.770482][ T6913] RIP: 0033:0x4452c9 [ 84.774357][ T6913] Code: Bad RIP value. [ 84.778395][ T6913] RSP: 002b:00007ffeec32d0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 84.786786][ T6913] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004452c9 [ 84.794738][ T6913] RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003 [ 84.802693][ T6913] RBP: 0000000000014653 R08: 0000000000000000 R09: 00000000004002e0 [ 84.810670][ T6913] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402460 [ 84.818618][ T6913] R13: 00000000004024f0 R14: 0000000000000000 R15: 0000000000000000 [ 84.827708][ T6913] Kernel Offset: disabled [ 84.832041][ T6913] Rebooting in 86400 seconds..