Warning: Permanently added '10.128.1.15' (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 syzkaller login: [ 110.528010][ T6943] ================================================================== [ 110.536375][ T6943] BUG: KASAN: use-after-free in tipc_nl_node_dump_link+0xdd6/0xdf0 [ 110.544276][ T6943] Read of size 2 at addr ffff88809449e014 by task syz-executor157/6943 [ 110.552528][ T6943] [ 110.554872][ T6943] CPU: 1 PID: 6943 Comm: syz-executor157 Not tainted 5.8.0-rc2-next-20200626-syzkaller #0 [ 110.564755][ T6943] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 110.574816][ T6943] Call Trace: [ 110.578116][ T6943] dump_stack+0x18f/0x20d [ 110.582531][ T6943] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 110.588061][ T6943] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 110.593596][ T6943] print_address_description.constprop.0.cold+0xae/0x436 [ 110.600615][ T6943] ? tipc_nl_node_dump_link+0x279/0xdf0 [ 110.606162][ T6943] ? lockdep_hardirqs_off+0x66/0xa0 [ 110.611398][ T6943] ? vprintk_func+0x97/0x1a6 [ 110.615975][ T6943] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 110.621510][ T6943] kasan_report.cold+0x1f/0x37 [ 110.626358][ T6943] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 110.631908][ T6943] tipc_nl_node_dump_link+0xdd6/0xdf0 [ 110.637279][ T6943] ? __mutex_lock+0x626/0x10d0 [ 110.642033][ T6943] ? tipc_nl_node_reset_link_stats+0xb40/0xb40 [ 110.648176][ T6943] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 110.653773][ T6943] ? kmem_cache_alloc_node_trace+0x4c2/0x590 [ 110.659762][ T6943] ? __kmalloc_node_track_caller+0x38/0x60 [ 110.665577][ T6943] ? kasan_unpoison_shadow+0x33/0x40 [ 110.670890][ T6943] ? __phys_addr+0x9a/0x110 [ 110.675397][ T6943] ? memset+0x20/0x40 [ 110.679367][ T6943] genl_lock_dumpit+0x7f/0xb0 [ 110.684028][ T6943] netlink_dump+0x4cd/0xf60 [ 110.688524][ T6943] ? netlink_insert+0x1670/0x1670 [ 110.693546][ T6943] ? __mutex_unlock_slowpath+0xe2/0x610 [ 110.699184][ T6943] ? genl_start+0x45a/0x6e0 [ 110.703675][ T6943] __netlink_dump_start+0x643/0x900 [ 110.708877][ T6943] ? genl_rcv_msg+0x9e0/0x9e0 [ 110.713546][ T6943] ? tipc_nl_node_reset_link_stats+0xb40/0xb40 [ 110.719705][ T6943] genl_family_rcv_msg_dumpit+0x2ac/0x310 [ 110.725420][ T6943] ? genl_rcv+0x40/0x40 [ 110.729569][ T6943] ? mutex_lock_io_nested+0xf60/0xf60 [ 110.734941][ T6943] ? mark_lock+0xbc/0x1710 [ 110.739350][ T6943] ? genl_rcv_msg+0x9e0/0x9e0 [ 110.744012][ T6943] ? genl_unlock+0x20/0x20 [ 110.748463][ T6943] ? genl_parallel_done+0x170/0x170 [ 110.753653][ T6943] ? __radix_tree_lookup+0x1f3/0x290 [ 110.758934][ T6943] genl_rcv_msg+0x797/0x9e0 [ 110.763446][ T6943] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 110.770430][ T6943] ? lock_acquire+0x1f1/0xad0 [ 110.775136][ T6943] ? genl_rcv+0x15/0x40 [ 110.779397][ T6943] ? lock_release+0x8d0/0x8d0 [ 110.784118][ T6943] netlink_rcv_skb+0x15a/0x430 [ 110.788878][ T6943] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 110.795800][ T6943] ? netlink_ack+0xa10/0xa10 [ 110.800390][ T6943] ? lock_is_held_type+0xb0/0xe0 [ 110.805358][ T6943] genl_rcv+0x24/0x40 [ 110.809376][ T6943] netlink_unicast+0x533/0x7d0 [ 110.814234][ T6943] ? netlink_attachskb+0x810/0x810 [ 110.819331][ T6943] ? _copy_from_iter_full+0x247/0x890 [ 110.824689][ T6943] ? __phys_addr+0x9a/0x110 [ 110.829301][ T6943] ? __phys_addr_symbol+0x2c/0x70 [ 110.834326][ T6943] ? __check_object_size+0x171/0x3e4 [ 110.839597][ T6943] netlink_sendmsg+0x856/0xd90 [ 110.844398][ T6943] ? netlink_unicast+0x7d0/0x7d0 [ 110.849327][ T6943] ? netlink_unicast+0x7d0/0x7d0 [ 110.854270][ T6943] sock_sendmsg+0xcf/0x120 [ 110.858877][ T6943] ____sys_sendmsg+0x6e8/0x810 [ 110.863667][ T6943] ? kernel_sendmsg+0x50/0x50 [ 110.868455][ T6943] ? do_recvmmsg+0x6d0/0x6d0 [ 110.873051][ T6943] ? find_held_lock+0x2d/0x110 [ 110.877831][ T6943] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 110.883833][ T6943] ? lock_downgrade+0x820/0x820 [ 110.888689][ T6943] ___sys_sendmsg+0xf3/0x170 [ 110.893274][ T6943] ? sendmsg_copy_msghdr+0x160/0x160 [ 110.898552][ T6943] ? debug_object_active_state+0x260/0x350 [ 110.905319][ T6943] ? lock_downgrade+0x820/0x820 [ 110.910171][ T6943] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 110.916608][ T6943] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 110.922598][ T6943] ? trace_hardirqs_on+0x5f/0x220 [ 110.927677][ T6943] ? lockdep_hardirqs_on+0x6a/0xe0 [ 110.932779][ T6943] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 110.938622][ T6943] ? debug_object_active_state+0x260/0x350 [ 110.944454][ T6943] ? check_preemption_disabled+0x50/0x130 [ 110.950200][ T6943] ? __fget_light+0x215/0x280 [ 110.954879][ T6943] __sys_sendmsg+0xe5/0x1b0 [ 110.959437][ T6943] ? __sys_sendmsg_sock+0xb0/0xb0 [ 110.964490][ T6943] ? lock_is_held_type+0xb0/0xe0 [ 110.969438][ T6943] ? do_syscall_64+0x1c/0xe0 [ 110.974013][ T6943] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 110.980007][ T6943] do_syscall_64+0x60/0xe0 [ 110.984421][ T6943] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 110.990325][ T6943] RIP: 0033:0x445b19 [ 110.994213][ T6943] Code: Bad RIP value. [ 110.998263][ T6943] RSP: 002b:00007ffc4b8af728 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 111.006686][ T6943] RAX: ffffffffffffffda RBX: 000000000001afa1 RCX: 0000000000445b19 [ 111.014652][ T6943] RDX: 0000000020004014 RSI: 00000000200000c0 RDI: 0000000000000003 [ 111.022667][ T6943] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 111.031346][ T6943] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000011 [ 111.039509][ T6943] R13: 0000000000402c10 R14: 0000000000000000 R15: 0000000000000000 [ 111.047477][ T6943] [ 111.049801][ T6943] Allocated by task 6944: [ 111.054118][ T6943] save_stack+0x1b/0x40 [ 111.058337][ T6943] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 111.064246][ T6943] __alloc_skb+0xae/0x550 [ 111.068564][ T6943] netlink_sendmsg+0x94f/0xd90 [ 111.073311][ T6943] sock_sendmsg+0xcf/0x120 [ 111.078056][ T6943] ____sys_sendmsg+0x6e8/0x810 [ 111.082805][ T6943] ___sys_sendmsg+0xf3/0x170 [ 111.087486][ T6943] __sys_sendmsg+0xe5/0x1b0 [ 111.092070][ T6943] do_syscall_64+0x60/0xe0 [ 111.096573][ T6943] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 111.102468][ T6943] [ 111.104783][ T6943] Freed by task 6944: [ 111.108760][ T6943] save_stack+0x1b/0x40 [ 111.113170][ T6943] __kasan_slab_free+0xf2/0x130 [ 111.118022][ T6943] kfree+0x103/0x2c0 [ 111.121985][ T6943] skb_release_data+0x6d9/0x910 [ 111.126908][ T6943] consume_skb+0xc2/0x160 [ 111.131231][ T6943] netlink_unicast+0x53b/0x7d0 [ 111.135988][ T6943] netlink_sendmsg+0x856/0xd90 [ 111.140755][ T6943] sock_sendmsg+0xcf/0x120 [ 111.145153][ T6943] ____sys_sendmsg+0x6e8/0x810 [ 111.149899][ T6943] ___sys_sendmsg+0xf3/0x170 [ 111.154475][ T6943] __sys_sendmsg+0xe5/0x1b0 [ 111.158970][ T6943] do_syscall_64+0x60/0xe0 [ 111.163394][ T6943] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 111.169277][ T6943] [ 111.171621][ T6943] The buggy address belongs to the object at ffff88809449e000 [ 111.171621][ T6943] which belongs to the cache kmalloc-1k of size 1024 [ 111.185657][ T6943] The buggy address is located 20 bytes inside of [ 111.185657][ T6943] 1024-byte region [ffff88809449e000, ffff88809449e400) [ 111.200521][ T6943] The buggy address belongs to the page: [ 111.206580][ T6943] page:ffffea0002512780 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 111.216511][ T6943] flags: 0xfffe0000000200(slab) [ 111.221351][ T6943] raw: 00fffe0000000200 ffffea0002a42148 ffffea0002987388 ffff8880aa000700 [ 111.229943][ T6943] raw: 0000000000000000 ffff88809449e000 0000000100000002 0000000000000000 [ 111.238533][ T6943] page dumped because: kasan: bad access detected [ 111.244949][ T6943] [ 111.247278][ T6943] Memory state around the buggy address: [ 111.252905][ T6943] ffff88809449df00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 111.260953][ T6943] ffff88809449df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 111.268998][ T6943] >ffff88809449e000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 111.277124][ T6943] ^ [ 111.281718][ T6943] ffff88809449e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 111.289763][ T6943] ffff88809449e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 111.297820][ T6943] ================================================================== [ 111.305859][ T6943] Disabling lock debugging due to kernel taint [ 111.322161][ T6943] Kernel panic - not syncing: panic_on_warn set ... [ 111.322176][ T6943] CPU: 1 PID: 6943 Comm: syz-executor157 Tainted: G B 5.8.0-rc2-next-20200626-syzkaller #0 [ 111.322181][ T6943] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 111.322184][ T6943] Call Trace: [ 111.322204][ T6943] dump_stack+0x18f/0x20d [ 111.322222][ T6943] ? tipc_nl_node_dump_link+0xd40/0xdf0 [ 111.322234][ T6943] panic+0x2e3/0x75c [ 111.322246][ T6943] ? __warn_printk+0xf3/0xf3 [ 111.322260][ T6943] ? preempt_schedule_common+0x59/0xc0 [ 111.322272][ T6943] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 111.322285][ T6943] ? preempt_schedule_thunk+0x16/0x18 [ 111.322302][ T6943] ? trace_hardirqs_on+0x55/0x220 [ 111.393321][ T6943] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 111.398966][ T6943] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 111.404591][ T6943] end_report+0x4d/0x53 [ 111.408780][ T6943] kasan_report.cold+0xd/0x37 [ 111.413450][ T6943] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 111.419011][ T6943] tipc_nl_node_dump_link+0xdd6/0xdf0 [ 111.424391][ T6943] ? __mutex_lock+0x626/0x10d0 [ 111.429162][ T6943] ? tipc_nl_node_reset_link_stats+0xb40/0xb40 [ 111.435400][ T6943] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 111.440935][ T6943] ? kmem_cache_alloc_node_trace+0x4c2/0x590 [ 111.446907][ T6943] ? __kmalloc_node_track_caller+0x38/0x60 [ 111.452871][ T6943] ? kasan_unpoison_shadow+0x33/0x40 [ 111.458154][ T6943] ? __phys_addr+0x9a/0x110 [ 111.462645][ T6943] ? memset+0x20/0x40 [ 111.466616][ T6943] genl_lock_dumpit+0x7f/0xb0 [ 111.471290][ T6943] netlink_dump+0x4cd/0xf60 [ 111.475824][ T6943] ? netlink_insert+0x1670/0x1670 [ 111.480835][ T6943] ? __mutex_unlock_slowpath+0xe2/0x610 [ 111.486372][ T6943] ? genl_start+0x45a/0x6e0 [ 111.490882][ T6943] __netlink_dump_start+0x643/0x900 [ 111.496070][ T6943] ? genl_rcv_msg+0x9e0/0x9e0 [ 111.500738][ T6943] ? tipc_nl_node_reset_link_stats+0xb40/0xb40 [ 111.506896][ T6943] genl_family_rcv_msg_dumpit+0x2ac/0x310 [ 111.512602][ T6943] ? genl_rcv+0x40/0x40 [ 111.516741][ T6943] ? mutex_lock_io_nested+0xf60/0xf60 [ 111.522107][ T6943] ? mark_lock+0xbc/0x1710 [ 111.526524][ T6943] ? genl_rcv_msg+0x9e0/0x9e0 [ 111.531195][ T6943] ? genl_unlock+0x20/0x20 [ 111.535600][ T6943] ? genl_parallel_done+0x170/0x170 [ 111.540783][ T6943] ? __radix_tree_lookup+0x1f3/0x290 [ 111.546078][ T6943] genl_rcv_msg+0x797/0x9e0 [ 111.550568][ T6943] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 111.557586][ T6943] ? lock_acquire+0x1f1/0xad0 [ 111.562258][ T6943] ? genl_rcv+0x15/0x40 [ 111.566398][ T6943] ? lock_release+0x8d0/0x8d0 [ 111.571077][ T6943] netlink_rcv_skb+0x15a/0x430 [ 111.575850][ T6943] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 111.582767][ T6943] ? netlink_ack+0xa10/0xa10 [ 111.587347][ T6943] ? lock_is_held_type+0xb0/0xe0 [ 111.592279][ T6943] genl_rcv+0x24/0x40 [ 111.596253][ T6943] netlink_unicast+0x533/0x7d0 [ 111.601025][ T6943] ? netlink_attachskb+0x810/0x810 [ 111.606161][ T6943] ? _copy_from_iter_full+0x247/0x890 [ 111.616212][ T6943] ? __phys_addr+0x9a/0x110 [ 111.620699][ T6943] ? __phys_addr_symbol+0x2c/0x70 [ 111.625707][ T6943] ? __check_object_size+0x171/0x3e4 [ 111.631013][ T6943] netlink_sendmsg+0x856/0xd90 [ 111.635766][ T6943] ? netlink_unicast+0x7d0/0x7d0 [ 111.640693][ T6943] ? netlink_unicast+0x7d0/0x7d0 [ 111.645632][ T6943] sock_sendmsg+0xcf/0x120 [ 111.650048][ T6943] ____sys_sendmsg+0x6e8/0x810 [ 111.659056][ T6943] ? kernel_sendmsg+0x50/0x50 [ 111.663749][ T6943] ? do_recvmmsg+0x6d0/0x6d0 [ 111.668340][ T6943] ? find_held_lock+0x2d/0x110 [ 111.673093][ T6943] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 111.679059][ T6943] ? lock_downgrade+0x820/0x820 [ 111.683908][ T6943] ___sys_sendmsg+0xf3/0x170 [ 111.688496][ T6943] ? sendmsg_copy_msghdr+0x160/0x160 [ 111.693776][ T6943] ? debug_object_active_state+0x260/0x350 [ 111.699577][ T6943] ? lock_downgrade+0x820/0x820 [ 111.704496][ T6943] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 111.710328][ T6943] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 111.716302][ T6943] ? trace_hardirqs_on+0x5f/0x220 [ 111.721335][ T6943] ? lockdep_hardirqs_on+0x6a/0xe0 [ 111.726432][ T6943] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 111.732227][ T6943] ? debug_object_active_state+0x260/0x350 [ 111.738033][ T6943] ? check_preemption_disabled+0x50/0x130 [ 111.743739][ T6943] ? __fget_light+0x215/0x280 [ 111.748406][ T6943] __sys_sendmsg+0xe5/0x1b0 [ 111.753119][ T6943] ? __sys_sendmsg_sock+0xb0/0xb0 [ 111.758157][ T6943] ? lock_is_held_type+0xb0/0xe0 [ 111.763138][ T6943] ? do_syscall_64+0x1c/0xe0 [ 111.767719][ T6943] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 111.773680][ T6943] do_syscall_64+0x60/0xe0 [ 111.778138][ T6943] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 111.784012][ T6943] RIP: 0033:0x445b19 [ 111.787887][ T6943] Code: Bad RIP value. [ 111.792082][ T6943] RSP: 002b:00007ffc4b8af728 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 111.800624][ T6943] RAX: ffffffffffffffda RBX: 000000000001afa1 RCX: 0000000000445b19 [ 111.808605][ T6943] RDX: 0000000020004014 RSI: 00000000200000c0 RDI: 0000000000000003 [ 111.816568][ T6943] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 111.824533][ T6943] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000011 [ 111.832551][ T6943] R13: 0000000000402c10 R14: 0000000000000000 R15: 0000000000000000 [ 111.841908][ T6943] Kernel Offset: disabled [ 111.846236][ T6943] Rebooting in 86400 seconds..