[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.201' (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 syzkaller login: [ 63.563361][ T6907] ================================================================== [ 63.571668][ T6907] BUG: KASAN: use-after-free in tipc_nl_node_dump_link+0xdd6/0xdf0 [ 63.579566][ T6907] Read of size 2 at addr ffff88809ec28014 by task syz-executor491/6907 [ 63.587883][ T6907] [ 63.590212][ T6907] CPU: 0 PID: 6907 Comm: syz-executor491 Not tainted 5.8.0-rc2-syzkaller #0 [ 63.598870][ T6907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.608908][ T6907] Call Trace: [ 63.612221][ T6907] dump_stack+0x18f/0x20d [ 63.616550][ T6907] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 63.622080][ T6907] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 63.627628][ T6907] print_address_description.constprop.0.cold+0xae/0x436 [ 63.634632][ T6907] ? tipc_nl_node_dump_link+0x279/0xdf0 [ 63.640166][ T6907] ? vprintk_func+0x97/0x1a6 [ 63.644758][ T6907] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 63.650286][ T6907] kasan_report.cold+0x1f/0x37 [ 63.655135][ T6907] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 63.660663][ T6907] tipc_nl_node_dump_link+0xdd6/0xdf0 [ 63.666059][ T6907] ? __mutex_lock+0x626/0x10d0 [ 63.670837][ T6907] ? tipc_nl_node_reset_link_stats+0xb40/0xb40 [ 63.677077][ T6907] ? check_preemption_disabled+0x38/0x220 [ 63.682807][ T6907] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 63.688343][ T6907] ? kmem_cache_alloc_node_trace+0x3b0/0x400 [ 63.694351][ T6907] ? __kmalloc_node_track_caller+0x38/0x60 [ 63.700144][ T6907] ? kasan_unpoison_shadow+0x33/0x40 [ 63.705413][ T6907] ? __phys_addr+0x9a/0x110 [ 63.709897][ T6907] ? memset+0x20/0x40 [ 63.713880][ T6907] genl_lock_dumpit+0x7f/0xb0 [ 63.718550][ T6907] netlink_dump+0x4cd/0xf60 [ 63.723040][ T6907] ? netlink_insert+0x1670/0x1670 [ 63.728069][ T6907] ? __mutex_unlock_slowpath+0xe2/0x610 [ 63.733604][ T6907] ? genl_start+0x45a/0x6e0 [ 63.738093][ T6907] __netlink_dump_start+0x643/0x900 [ 63.743881][ T6907] ? genl_rcv_msg+0x9e0/0x9e0 [ 63.748554][ T6907] ? tipc_nl_node_reset_link_stats+0xb40/0xb40 [ 63.754710][ T6907] genl_family_rcv_msg_dumpit+0x2ac/0x310 [ 63.760534][ T6907] ? genl_rcv+0x40/0x40 [ 63.764701][ T6907] ? mutex_lock_io_nested+0xf60/0xf60 [ 63.770221][ T6907] ? mark_lock+0xbc/0x1710 [ 63.774704][ T6907] ? genl_rcv_msg+0x9e0/0x9e0 [ 63.779373][ T6907] ? genl_unlock+0x20/0x20 [ 63.783776][ T6907] ? genl_parallel_done+0x170/0x170 [ 63.788960][ T6907] ? __radix_tree_lookup+0x1f3/0x290 [ 63.794235][ T6907] genl_rcv_msg+0x797/0x9e0 [ 63.798741][ T6907] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 63.805670][ T6907] ? lock_acquire+0x1f1/0xad0 [ 63.810350][ T6907] ? genl_rcv+0x15/0x40 [ 63.814493][ T6907] ? lock_release+0x8d0/0x8d0 [ 63.819163][ T6907] netlink_rcv_skb+0x15a/0x430 [ 63.823939][ T6907] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 63.830872][ T6907] ? netlink_ack+0xa10/0xa10 [ 63.835461][ T6907] genl_rcv+0x24/0x40 [ 63.839440][ T6907] netlink_unicast+0x533/0x7d0 [ 63.844197][ T6907] ? netlink_attachskb+0x810/0x810 [ 63.849292][ T6907] ? _copy_from_iter_full+0x247/0x890 [ 63.854734][ T6907] ? __phys_addr+0x9a/0x110 [ 63.859233][ T6907] ? __phys_addr_symbol+0x2c/0x70 [ 63.864240][ T6907] ? __check_object_size+0x171/0x3e4 [ 63.869512][ T6907] netlink_sendmsg+0x856/0xd90 [ 63.874267][ T6907] ? netlink_unicast+0x7d0/0x7d0 [ 63.879284][ T6907] ? netlink_unicast+0x7d0/0x7d0 [ 63.884203][ T6907] sock_sendmsg+0xcf/0x120 [ 63.888603][ T6907] ____sys_sendmsg+0x6e8/0x810 [ 63.893348][ T6907] ? kernel_sendmsg+0x50/0x50 [ 63.898005][ T6907] ? do_recvmmsg+0x6d0/0x6d0 [ 63.902574][ T6907] ? find_held_lock+0x2d/0x110 [ 63.907412][ T6907] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 63.913392][ T6907] ? lock_downgrade+0x820/0x820 [ 63.918671][ T6907] ___sys_sendmsg+0xf3/0x170 [ 63.923252][ T6907] ? sendmsg_copy_msghdr+0x160/0x160 [ 63.928531][ T6907] ? debug_object_active_state+0x260/0x350 [ 63.934340][ T6907] ? lock_downgrade+0x820/0x820 [ 63.939198][ T6907] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 63.945001][ T6907] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 63.950982][ T6907] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 63.956787][ T6907] ? debug_object_active_state+0x260/0x350 [ 63.962575][ T6907] ? trace_hardirqs_off+0x27/0x210 [ 63.967760][ T6907] ? __fget_light+0x215/0x280 [ 63.972425][ T6907] __sys_sendmsg+0xe5/0x1b0 [ 63.976922][ T6907] ? __sys_sendmsg_sock+0xb0/0xb0 [ 63.981932][ T6907] ? check_preemption_disabled+0x38/0x220 [ 63.987652][ T6907] ? do_syscall_64+0x1c/0xe0 [ 63.992929][ T6907] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 63.998911][ T6907] do_syscall_64+0x60/0xe0 [ 64.003385][ T6907] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.009447][ T6907] RIP: 0033:0x4456f9 [ 64.013323][ T6907] Code: Bad RIP value. [ 64.017374][ T6907] RSP: 002b:00007fff47fc7fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 64.025781][ T6907] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004456f9 [ 64.034964][ T6907] RDX: 0000000020004014 RSI: 00000000200000c0 RDI: 0000000000000003 [ 64.042916][ T6907] RBP: 000000000000f82e R08: 0000000000000000 R09: 00000000004002e0 [ 64.050974][ T6907] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402890 [ 64.059017][ T6907] R13: 0000000000402920 R14: 0000000000000000 R15: 0000000000000000 [ 64.066984][ T6907] [ 64.069313][ T6907] Allocated by task 6908: [ 64.073630][ T6907] save_stack+0x1b/0x40 [ 64.077782][ T6907] __kasan_kmalloc.constprop.0+0xc2/0xd0 [ 64.083404][ T6907] __alloc_skb+0xae/0x550 [ 64.087726][ T6907] netlink_sendmsg+0x94f/0xd90 [ 64.092478][ T6907] sock_sendmsg+0xcf/0x120 [ 64.096878][ T6907] ____sys_sendmsg+0x6e8/0x810 [ 64.101705][ T6907] ___sys_sendmsg+0xf3/0x170 [ 64.106275][ T6907] __sys_sendmsg+0xe5/0x1b0 [ 64.111058][ T6907] do_syscall_64+0x60/0xe0 [ 64.115724][ T6907] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.121590][ T6907] [ 64.123894][ T6907] Freed by task 6908: [ 64.127866][ T6907] save_stack+0x1b/0x40 [ 64.132009][ T6907] __kasan_slab_free+0xf5/0x140 [ 64.136837][ T6907] kfree+0x103/0x2c0 [ 64.140713][ T6907] skb_release_data+0x6d9/0x910 [ 64.146322][ T6907] consume_skb+0xc2/0x160 [ 64.150644][ T6907] netlink_unicast+0x53b/0x7d0 [ 64.155388][ T6907] netlink_sendmsg+0x856/0xd90 [ 64.161778][ T6907] sock_sendmsg+0xcf/0x120 [ 64.166173][ T6907] ____sys_sendmsg+0x6e8/0x810 [ 64.171005][ T6907] ___sys_sendmsg+0xf3/0x170 [ 64.175637][ T6907] __sys_sendmsg+0xe5/0x1b0 [ 64.180121][ T6907] do_syscall_64+0x60/0xe0 [ 64.184517][ T6907] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.190380][ T6907] [ 64.192689][ T6907] The buggy address belongs to the object at ffff88809ec28000 [ 64.192689][ T6907] which belongs to the cache kmalloc-1k of size 1024 [ 64.206818][ T6907] The buggy address is located 20 bytes inside of [ 64.206818][ T6907] 1024-byte region [ffff88809ec28000, ffff88809ec28400) [ 64.220159][ T6907] The buggy address belongs to the page: [ 64.225780][ T6907] page:ffffea00027b0a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 64.234959][ T6907] flags: 0xfffe0000000200(slab) [ 64.239795][ T6907] raw: 00fffe0000000200 ffffea000248d4c8 ffffea0002499b08 ffff8880aa000c40 [ 64.248372][ T6907] raw: 0000000000000000 ffff88809ec28000 0000000100000002 0000000000000000 [ 64.256939][ T6907] page dumped because: kasan: bad access detected [ 64.263342][ T6907] executing program [ 64.265664][ T6907] Memory state around the buggy address: [ 64.271282][ T6907] ffff88809ec27f00: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc [ 64.279341][ T6907] ffff88809ec27f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 64.287383][ T6907] >ffff88809ec28000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.295421][ T6907] ^ [ 64.300018][ T6907] ffff88809ec28080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.308082][ T6907] ffff88809ec28100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.316131][ T6907] ================================================================== [ 64.324258][ T6907] Disabling lock debugging due to kernel taint [ 64.334619][ T6907] Kernel panic - not syncing: panic_on_warn set ... [ 64.341230][ T6907] CPU: 0 PID: 6907 Comm: syz-executor491 Tainted: G B 5.8.0-rc2-syzkaller #0 [ 64.351398][ T6907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.362005][ T6907] Call Trace: [ 64.365300][ T6907] dump_stack+0x18f/0x20d [ 64.369817][ T6907] ? tipc_nl_node_dump_link+0xd40/0xdf0 [ 64.376135][ T6907] panic+0x2e3/0x75c [ 64.380448][ T6907] ? __warn_printk+0xf3/0xf3 [ 64.389909][ T6907] ? preempt_schedule_common+0x59/0xc0 [ 64.395541][ T6907] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 64.401088][ T6907] ? preempt_schedule_thunk+0x16/0x18 [ 64.406535][ T6907] ? trace_hardirqs_on+0x55/0x220 [ 64.411541][ T6907] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 64.417155][ T6907] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 64.422827][ T6907] end_report+0x4d/0x53 [ 64.426974][ T6907] kasan_report.cold+0xd/0x37 [ 64.431992][ T6907] ? tipc_nl_node_dump_link+0xdd6/0xdf0 [ 64.437613][ T6907] tipc_nl_node_dump_link+0xdd6/0xdf0 [ 64.443159][ T6907] ? __mutex_lock+0x626/0x10d0 [ 64.447919][ T6907] ? tipc_nl_node_reset_link_stats+0xb40/0xb40 [ 64.454328][ T6907] ? check_preemption_disabled+0x38/0x220 [ 64.460053][ T6907] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 64.466309][ T6907] ? kmem_cache_alloc_node_trace+0x3b0/0x400 [ 64.472803][ T6907] ? __kmalloc_node_track_caller+0x38/0x60 [ 64.478608][ T6907] ? kasan_unpoison_shadow+0x33/0x40 [ 64.484172][ T6907] ? __phys_addr+0x9a/0x110 [ 64.488662][ T6907] ? memset+0x20/0x40 [ 64.492903][ T6907] genl_lock_dumpit+0x7f/0xb0 [ 64.498612][ T6907] netlink_dump+0x4cd/0xf60 [ 64.503101][ T6907] ? netlink_insert+0x1670/0x1670 [ 64.508372][ T6907] ? __mutex_unlock_slowpath+0xe2/0x610 [ 64.514371][ T6907] ? genl_start+0x45a/0x6e0 [ 64.518884][ T6907] __netlink_dump_start+0x643/0x900 [ 64.524155][ T6907] ? genl_rcv_msg+0x9e0/0x9e0 [ 64.528989][ T6907] ? tipc_nl_node_reset_link_stats+0xb40/0xb40 [ 64.535129][ T6907] genl_family_rcv_msg_dumpit+0x2ac/0x310 [ 64.540901][ T6907] ? genl_rcv+0x40/0x40 [ 64.545314][ T6907] ? mutex_lock_io_nested+0xf60/0xf60 [ 64.550790][ T6907] ? mark_lock+0xbc/0x1710 [ 64.555390][ T6907] ? genl_rcv_msg+0x9e0/0x9e0 [ 64.560132][ T6907] ? genl_unlock+0x20/0x20 [ 64.564614][ T6907] ? genl_parallel_done+0x170/0x170 [ 64.569795][ T6907] ? __radix_tree_lookup+0x1f3/0x290 [ 64.575667][ T6907] genl_rcv_msg+0x797/0x9e0 [ 64.580155][ T6907] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 64.587084][ T6907] ? lock_acquire+0x1f1/0xad0 [ 64.591751][ T6907] ? genl_rcv+0x15/0x40 [ 64.595898][ T6907] ? lock_release+0x8d0/0x8d0 [ 64.600574][ T6907] netlink_rcv_skb+0x15a/0x430 [ 64.605341][ T6907] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 64.612265][ T6907] ? netlink_ack+0xa10/0xa10 [ 64.616839][ T6907] genl_rcv+0x24/0x40 [ 64.620803][ T6907] netlink_unicast+0x533/0x7d0 [ 64.625553][ T6907] ? netlink_attachskb+0x810/0x810 [ 64.630662][ T6907] ? _copy_from_iter_full+0x247/0x890 [ 64.636011][ T6907] ? __phys_addr+0x9a/0x110 [ 64.640517][ T6907] ? __phys_addr_symbol+0x2c/0x70 [ 64.645521][ T6907] ? __check_object_size+0x171/0x3e4 [ 64.650784][ T6907] netlink_sendmsg+0x856/0xd90 [ 64.655607][ T6907] ? netlink_unicast+0x7d0/0x7d0 [ 64.660543][ T6907] ? netlink_unicast+0x7d0/0x7d0 [ 64.665464][ T6907] sock_sendmsg+0xcf/0x120 [ 64.669863][ T6907] ____sys_sendmsg+0x6e8/0x810 [ 64.674616][ T6907] ? kernel_sendmsg+0x50/0x50 [ 64.679272][ T6907] ? do_recvmmsg+0x6d0/0x6d0 [ 64.683839][ T6907] ? find_held_lock+0x2d/0x110 [ 64.688928][ T6907] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 64.694971][ T6907] ? lock_downgrade+0x820/0x820 [ 64.699803][ T6907] ___sys_sendmsg+0xf3/0x170 [ 64.704507][ T6907] ? sendmsg_copy_msghdr+0x160/0x160 [ 64.709878][ T6907] ? debug_object_active_state+0x260/0x350 [ 64.715695][ T6907] ? lock_downgrade+0x820/0x820 [ 64.720623][ T6907] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 64.726418][ T6907] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 64.732390][ T6907] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 64.738192][ T6907] ? debug_object_active_state+0x260/0x350 [ 64.743983][ T6907] ? trace_hardirqs_off+0x27/0x210 [ 64.749075][ T6907] ? __fget_light+0x215/0x280 [ 64.753739][ T6907] __sys_sendmsg+0xe5/0x1b0 [ 64.758406][ T6907] ? __sys_sendmsg_sock+0xb0/0xb0 [ 64.763439][ T6907] ? check_preemption_disabled+0x38/0x220 [ 64.769168][ T6907] ? do_syscall_64+0x1c/0xe0 [ 64.773741][ T6907] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 64.779714][ T6907] do_syscall_64+0x60/0xe0 [ 64.784205][ T6907] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.790291][ T6907] RIP: 0033:0x4456f9 [ 64.794181][ T6907] Code: Bad RIP value. [ 64.798429][ T6907] RSP: 002b:00007fff47fc7fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 64.806816][ T6907] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004456f9 [ 64.815034][ T6907] RDX: 0000000020004014 RSI: 00000000200000c0 RDI: 0000000000000003 [ 64.822987][ T6907] RBP: 000000000000f82e R08: 0000000000000000 R09: 00000000004002e0 [ 64.830994][ T6907] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402890 [ 64.838945][ T6907] R13: 0000000000402920 R14: 0000000000000000 R15: 0000000000000000 [ 64.848339][ T6907] Kernel Offset: disabled [ 64.852691][ T6907] Rebooting in 86400 seconds..