Warning: Permanently added '10.128.0.174' (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 syzkaller login: [ 65.631311][ T6888] ================================================================== [ 65.639554][ T6888] BUG: KASAN: use-after-free in tipc_nl_node_dump_link+0xdd6/0xdf0 [ 65.647432][ T6888] Read of size 2 at addr ffff88808e3a0814 by task syz-executor443/6888 [ 65.655639][ T6888] [ 65.657960][ T6888] CPU: 0 PID: 6888 Comm: syz-executor443 Not tainted 5.8.0-rc1-syzkaller #0 [ 65.666610][ T6888] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.676636][ T6888] Call Trace: [ 65.679910][ T6888] dump_stack+0x18f/0x20d [ 65.684218][ T6888] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 65.689739][ T6888] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 65.695274][ T6888] print_address_description.constprop.0.cold+0xae/0x436 [ 65.702278][ T6888] ? tipc_nl_node_dump_link+0x279/0xdf0 [ 65.707817][ T6888] ? vprintk_func+0x97/0x1a6 [ 65.712388][ T6888] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 65.718039][ T6888] kasan_report.cold+0x1f/0x37 [ 65.722784][ T6888] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 65.728312][ T6888] tipc_nl_node_dump_link+0xdd6/0xdf0 [ 65.733665][ T6888] ? __mutex_lock+0x626/0x10d0 [ 65.738412][ T6888] ? tipc_nl_node_reset_link_stats+0xb40/0xb40 [ 65.744548][ T6888] ? quarantine_reduce+0x1a7/0x200 [ 65.749636][ T6888] ? kasan_unpoison_shadow+0x33/0x40 [ 65.754896][ T6888] ? __phys_addr+0x9a/0x110 [ 65.759375][ T6888] ? memset+0x20/0x40 [ 65.767334][ T6888] genl_lock_dumpit+0x7f/0xb0 [ 65.771989][ T6888] netlink_dump+0x4cd/0xf60 [ 65.776470][ T6888] ? netlink_insert+0x1670/0x1670 [ 65.781479][ T6888] ? __mutex_unlock_slowpath+0xe2/0x610 [ 65.787012][ T6888] ? genl_start+0x45a/0x6e0 [ 65.791582][ T6888] __netlink_dump_start+0x643/0x900 [ 65.796754][ T6888] ? genl_rcv_msg+0x9e0/0x9e0 [ 65.801409][ T6888] ? tipc_nl_node_reset_link_stats+0xb40/0xb40 [ 65.807536][ T6888] genl_family_rcv_msg_dumpit+0x2ac/0x310 [ 65.813235][ T6888] ? genl_rcv+0x40/0x40 [ 65.817368][ T6888] ? mutex_lock_io_nested+0xf60/0xf60 [ 65.822716][ T6888] ? mark_lock+0xbc/0x1710 [ 65.827110][ T6888] ? genl_rcv_msg+0x9e0/0x9e0 [ 65.831819][ T6888] ? genl_unlock+0x20/0x20 [ 65.836260][ T6888] ? genl_parallel_done+0x170/0x170 [ 65.841452][ T6888] ? __radix_tree_lookup+0x1f3/0x290 [ 65.846719][ T6888] genl_rcv_msg+0x797/0x9e0 [ 65.851206][ T6888] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 65.858119][ T6888] ? lock_acquire+0x1f1/0xad0 [ 65.862817][ T6888] ? genl_rcv+0x15/0x40 [ 65.866952][ T6888] ? lock_release+0x8d0/0x8d0 [ 65.871610][ T6888] netlink_rcv_skb+0x15a/0x430 [ 65.876359][ T6888] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 65.883272][ T6888] ? netlink_ack+0xa10/0xa10 [ 65.887854][ T6888] genl_rcv+0x24/0x40 [ 65.891812][ T6888] netlink_unicast+0x533/0x7d0 [ 65.896557][ T6888] ? netlink_attachskb+0x810/0x810 [ 65.901649][ T6888] ? _copy_from_iter_full+0x247/0x890 [ 65.907006][ T6888] ? __phys_addr+0x9a/0x110 [ 65.911485][ T6888] ? __phys_addr_symbol+0x2c/0x70 [ 65.916486][ T6888] ? __check_object_size+0x171/0x3e4 [ 65.921752][ T6888] netlink_sendmsg+0x856/0xd90 [ 65.926498][ T6888] ? netlink_unicast+0x7d0/0x7d0 [ 65.931417][ T6888] ? netlink_unicast+0x7d0/0x7d0 [ 65.936330][ T6888] sock_sendmsg+0xcf/0x120 [ 65.940726][ T6888] ____sys_sendmsg+0x6e8/0x810 [ 65.945466][ T6888] ? kernel_sendmsg+0x50/0x50 [ 65.950118][ T6888] ? do_recvmmsg+0x6d0/0x6d0 [ 65.954682][ T6888] ? find_held_lock+0x2d/0x110 [ 65.959423][ T6888] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 65.965378][ T6888] ? lock_downgrade+0x820/0x820 [ 65.970209][ T6888] ___sys_sendmsg+0xf3/0x170 [ 65.974778][ T6888] ? sendmsg_copy_msghdr+0x160/0x160 [ 65.980053][ T6888] ? debug_object_active_state+0x260/0x350 [ 65.985848][ T6888] ? lock_downgrade+0x820/0x820 [ 65.990680][ T6888] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 65.996460][ T6888] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 66.002418][ T6888] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 66.008201][ T6888] ? debug_object_active_state+0x260/0x350 [ 66.013988][ T6888] ? trace_hardirqs_off+0x27/0x210 [ 66.019078][ T6888] ? __fget_light+0x215/0x280 [ 66.023742][ T6888] __sys_sendmsg+0xe5/0x1b0 [ 66.028222][ T6888] ? __sys_sendmsg_sock+0xb0/0xb0 [ 66.033242][ T6888] ? check_preemption_disabled+0x38/0x220 [ 66.038953][ T6888] ? do_syscall_64+0x1c/0xe0 [ 66.043519][ T6888] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 66.049577][ T6888] do_syscall_64+0x60/0xe0 [ 66.053972][ T6888] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.059849][ T6888] RIP: 0033:0x4456f9 [ 66.063720][ T6888] Code: Bad RIP value. [ 66.067765][ T6888] RSP: 002b:00007ffdb9fc8fa8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 66.076153][ T6888] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004456f9 [ 66.084106][ T6888] RDX: 0000000020004014 RSI: 00000000200000c0 RDI: 0000000000000003 [ 66.092054][ T6888] RBP: 0000000000010032 R08: 0000000000000000 R09: 00000000004002e0 [ 66.100004][ T6888] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402890 [ 66.107961][ T6888] R13: 0000000000402920 R14: 0000000000000000 R15: 0000000000000000 [ 66.115943][ T6888] [ 66.118247][ T6888] Allocated by task 6891: [ 66.122557][ T6888] save_stack+0x1b/0x40 [ 66.126690][ T6888] __kasan_kmalloc.constprop.0+0xc2/0xd0 [ 66.132299][ T6888] __alloc_skb+0xae/0x550 [ 66.136607][ T6888] netlink_sendmsg+0x94f/0xd90 [ 66.141359][ T6888] sock_sendmsg+0xcf/0x120 [ 66.145757][ T6888] ____sys_sendmsg+0x6e8/0x810 [ 66.150499][ T6888] ___sys_sendmsg+0xf3/0x170 [ 66.155495][ T6888] __sys_sendmsg+0xe5/0x1b0 [ 66.159984][ T6888] do_syscall_64+0x60/0xe0 [ 66.164375][ T6888] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.170251][ T6888] [ 66.172555][ T6888] Freed by task 6891: [ 66.176527][ T6888] save_stack+0x1b/0x40 [ 66.180658][ T6888] __kasan_slab_free+0xf5/0x140 [ 66.185483][ T6888] kfree+0x103/0x2c0 [ 66.189354][ T6888] skb_release_data+0x6d9/0x910 [ 66.194177][ T6888] consume_skb+0xc2/0x160 [ 66.198480][ T6888] netlink_unicast+0x53b/0x7d0 [ 66.203230][ T6888] netlink_sendmsg+0x856/0xd90 [ 66.207977][ T6888] sock_sendmsg+0xcf/0x120 [ 66.212378][ T6888] ____sys_sendmsg+0x6e8/0x810 [ 66.217135][ T6888] ___sys_sendmsg+0xf3/0x170 [ 66.221702][ T6888] __sys_sendmsg+0xe5/0x1b0 [ 66.226179][ T6888] do_syscall_64+0x60/0xe0 [ 66.230582][ T6888] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.236455][ T6888] [ 66.238764][ T6888] The buggy address belongs to the object at ffff88808e3a0800 [ 66.238764][ T6888] which belongs to the cache kmalloc-1k of size 1024 [ 66.252793][ T6888] The buggy address is located 20 bytes inside of [ 66.252793][ T6888] 1024-byte region [ffff88808e3a0800, ffff88808e3a0c00) [ 66.266035][ T6888] The buggy address belongs to the page: [ 66.271675][ T6888] page:ffffea000238e800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 66.280763][ T6888] flags: 0xfffe0000000200(slab) [ 66.285591][ T6888] raw: 00fffe0000000200 ffffea00024ddd48 ffff8880aa001850 ffff8880aa000c40 [ 66.294151][ T6888] raw: 0000000000000000 ffff88808e3a0000 0000000100000002 0000000000000000 [ 66.302747][ T6888] page dumped because: kasan: bad access detected [ 66.309181][ T6888] [ 66.311482][ T6888] Memory state around the buggy address: [ 66.317098][ T6888] ffff88808e3a0700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 66.325135][ T6888] ffff88808e3a0780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 66.333178][ T6888] >ffff88808e3a0800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.341214][ T6888] ^ [ 66.345784][ T6888] ffff88808e3a0880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.353828][ T6888] ffff88808e3a0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.361866][ T6888] ================================================================== [ 66.369901][ T6888] Disabling lock debugging due to kernel taint executing program [ 66.379455][ T6888] Kernel panic - not syncing: panic_on_warn set ... [ 66.386057][ T6888] CPU: 0 PID: 6888 Comm: syz-executor443 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 66.396100][ T6888] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.406149][ T6888] Call Trace: [ 66.409434][ T6888] dump_stack+0x18f/0x20d [ 66.413759][ T6888] ? tipc_nl_node_dump_link+0xd20/0xdf0 [ 66.419307][ T6888] panic+0x2e3/0x75c [ 66.423310][ T6888] ? __warn_printk+0xf3/0xf3 [ 66.427877][ T6888] ? preempt_schedule_common+0x59/0xc0 [ 66.433310][ T6888] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 66.438834][ T6888] ? preempt_schedule_thunk+0x16/0x18 [ 66.444182][ T6888] ? trace_hardirqs_on+0x55/0x220 [ 66.449192][ T6888] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 66.454721][ T6888] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 66.460241][ T6888] end_report+0x4d/0x53 [ 66.464371][ T6888] kasan_report.cold+0xd/0x37 [ 66.469023][ T6888] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 66.474541][ T6888] tipc_nl_node_dump_link+0xdd6/0xdf0 [ 66.479895][ T6888] ? __mutex_lock+0x626/0x10d0 [ 66.484641][ T6888] ? tipc_nl_node_reset_link_stats+0xb40/0xb40 [ 66.490779][ T6888] ? quarantine_reduce+0x1a7/0x200 [ 66.495865][ T6888] ? kasan_unpoison_shadow+0x33/0x40 [ 66.501121][ T6888] ? __phys_addr+0x9a/0x110 [ 66.505599][ T6888] ? memset+0x20/0x40 [ 66.509558][ T6888] genl_lock_dumpit+0x7f/0xb0 [ 66.514209][ T6888] netlink_dump+0x4cd/0xf60 [ 66.518688][ T6888] ? netlink_insert+0x1670/0x1670 [ 66.523684][ T6888] ? __mutex_unlock_slowpath+0xe2/0x610 [ 66.529221][ T6888] ? genl_start+0x45a/0x6e0 [ 66.533725][ T6888] __netlink_dump_start+0x643/0x900 [ 66.538896][ T6888] ? genl_rcv_msg+0x9e0/0x9e0 [ 66.543547][ T6888] ? tipc_nl_node_reset_link_stats+0xb40/0xb40 [ 66.549673][ T6888] genl_family_rcv_msg_dumpit+0x2ac/0x310 [ 66.555380][ T6888] ? genl_rcv+0x40/0x40 [ 66.559508][ T6888] ? mutex_lock_io_nested+0xf60/0xf60 [ 66.564854][ T6888] ? mark_lock+0xbc/0x1710 [ 66.569243][ T6888] ? genl_rcv_msg+0x9e0/0x9e0 [ 66.573894][ T6888] ? genl_unlock+0x20/0x20 [ 66.578285][ T6888] ? genl_parallel_done+0x170/0x170 [ 66.583472][ T6888] ? __radix_tree_lookup+0x1f3/0x290 [ 66.588731][ T6888] genl_rcv_msg+0x797/0x9e0 [ 66.593210][ T6888] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 66.600125][ T6888] ? lock_acquire+0x1f1/0xad0 [ 66.604773][ T6888] ? genl_rcv+0x15/0x40 [ 66.608900][ T6888] ? lock_release+0x8d0/0x8d0 [ 66.613550][ T6888] netlink_rcv_skb+0x15a/0x430 [ 66.618289][ T6888] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 66.625197][ T6888] ? netlink_ack+0xa10/0xa10 [ 66.629762][ T6888] genl_rcv+0x24/0x40 [ 66.633718][ T6888] netlink_unicast+0x533/0x7d0 [ 66.638454][ T6888] ? netlink_attachskb+0x810/0x810 [ 66.643537][ T6888] ? _copy_from_iter_full+0x247/0x890 [ 66.648891][ T6888] ? __phys_addr+0x9a/0x110 [ 66.653375][ T6888] ? __phys_addr_symbol+0x2c/0x70 [ 66.658375][ T6888] ? __check_object_size+0x171/0x3e4 [ 66.663634][ T6888] netlink_sendmsg+0x856/0xd90 [ 66.668415][ T6888] ? netlink_unicast+0x7d0/0x7d0 [ 66.673328][ T6888] ? netlink_unicast+0x7d0/0x7d0 [ 66.678236][ T6888] sock_sendmsg+0xcf/0x120 [ 66.682625][ T6888] ____sys_sendmsg+0x6e8/0x810 [ 66.687363][ T6888] ? kernel_sendmsg+0x50/0x50 [ 66.692008][ T6888] ? do_recvmmsg+0x6d0/0x6d0 [ 66.696571][ T6888] ? find_held_lock+0x2d/0x110 [ 66.701321][ T6888] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 66.707282][ T6888] ? lock_downgrade+0x820/0x820 [ 66.712119][ T6888] ___sys_sendmsg+0xf3/0x170 [ 66.716686][ T6888] ? sendmsg_copy_msghdr+0x160/0x160 [ 66.721951][ T6888] ? debug_object_active_state+0x260/0x350 [ 66.727818][ T6888] ? lock_downgrade+0x820/0x820 [ 66.732653][ T6888] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 66.738431][ T6888] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 66.744393][ T6888] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 66.750180][ T6888] ? debug_object_active_state+0x260/0x350 [ 66.755958][ T6888] ? trace_hardirqs_off+0x27/0x210 [ 66.761045][ T6888] ? __fget_light+0x215/0x280 [ 66.765697][ T6888] __sys_sendmsg+0xe5/0x1b0 [ 66.770174][ T6888] ? __sys_sendmsg_sock+0xb0/0xb0 [ 66.775183][ T6888] ? check_preemption_disabled+0x38/0x220 [ 66.780889][ T6888] ? do_syscall_64+0x1c/0xe0 [ 66.785450][ T6888] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 66.791404][ T6888] do_syscall_64+0x60/0xe0 [ 66.795797][ T6888] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.801662][ T6888] RIP: 0033:0x4456f9 [ 66.805520][ T6888] Code: Bad RIP value. [ 66.809557][ T6888] RSP: 002b:00007ffdb9fc8fa8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 66.817941][ T6888] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004456f9 [ 66.825932][ T6888] RDX: 0000000020004014 RSI: 00000000200000c0 RDI: 0000000000000003 [ 66.833875][ T6888] RBP: 0000000000010032 R08: 0000000000000000 R09: 00000000004002e0 [ 66.841906][ T6888] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402890 [ 66.849861][ T6888] R13: 0000000000402920 R14: 0000000000000000 R15: 0000000000000000 [ 66.858441][ T6888] Kernel Offset: disabled [ 66.862761][ T6888] Rebooting in 86400 seconds..