[ 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 '10.128.10.18' (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: [ 79.074418][ T6893] ================================================================== [ 79.082660][ T6893] BUG: KASAN: use-after-free in tipc_nl_node_dump_monitor_peer+0x566/0x590 [ 79.091248][ T6893] Read of size 2 at addr ffff8880a4b0a814 by task syz-executor823/6893 [ 79.099466][ T6893] [ 79.101788][ T6893] CPU: 0 PID: 6893 Comm: syz-executor823 Not tainted 5.8.0-rc2-syzkaller #0 [ 79.110429][ T6893] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.120460][ T6893] Call Trace: [ 79.123732][ T6893] dump_stack+0x1f0/0x31e [ 79.128074][ T6893] print_address_description+0x66/0x5a0 [ 79.133600][ T6893] ? vprintk_emit+0x342/0x3c0 [ 79.138329][ T6893] ? printk+0x62/0x83 [ 79.142291][ T6893] ? vprintk_emit+0x339/0x3c0 [ 79.146945][ T6893] kasan_report+0x132/0x1d0 [ 79.151447][ T6893] ? tipc_nl_node_dump_monitor_peer+0x566/0x590 [ 79.157664][ T6893] ? __mutex_lock_common+0x582/0x2fc0 [ 79.163031][ T6893] tipc_nl_node_dump_monitor_peer+0x566/0x590 [ 79.169107][ T6893] genl_lock_dumpit+0x86/0xa0 [ 79.173813][ T6893] netlink_dump+0x4be/0x10d0 [ 79.178475][ T6893] ? __netlink_dump_start+0x530/0x700 [ 79.183849][ T6893] __netlink_dump_start+0x538/0x700 [ 79.189250][ T6893] genl_rcv_msg+0xb03/0xe00 [ 79.193738][ T6893] ? genl_rcv_msg+0xe00/0xe00 [ 79.198416][ T6893] ? genl_start+0x570/0x570 [ 79.202902][ T6893] ? genl_lock_dumpit+0xa0/0xa0 [ 79.207743][ T6893] netlink_rcv_skb+0x190/0x3a0 [ 79.212554][ T6893] ? genl_unbind+0x270/0x270 [ 79.217129][ T6893] genl_rcv+0x24/0x40 [ 79.221221][ T6893] netlink_unicast+0x786/0x940 [ 79.225988][ T6893] netlink_sendmsg+0xa57/0xd70 [ 79.230740][ T6893] ? netlink_getsockopt+0x9e0/0x9e0 [ 79.235929][ T6893] ____sys_sendmsg+0x519/0x800 [ 79.240689][ T6893] ? import_iovec+0x12a/0x2c0 [ 79.245344][ T6893] __sys_sendmsg+0x2b1/0x360 [ 79.250079][ T6893] ? rcu_lock_release+0x9/0x20 [ 79.254923][ T6893] ? __fd_install+0x251/0x490 [ 79.259588][ T6893] ? check_preemption_disabled+0x40/0x240 [ 79.265286][ T6893] ? check_preemption_disabled+0x40/0x240 [ 79.270982][ T6893] ? do_syscall_64+0x1d/0xe0 [ 79.275553][ T6893] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 79.281738][ T6893] do_syscall_64+0x73/0xe0 [ 79.286150][ T6893] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 79.292128][ T6893] RIP: 0033:0x4452a9 [ 79.296096][ T6893] Code: Bad RIP value. [ 79.300152][ T6893] RSP: 002b:00007fff822c3fa8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 79.308625][ T6893] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004452a9 [ 79.316589][ T6893] RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003 [ 79.324838][ T6893] RBP: 00000000000134d3 R08: 00000000004002e0 R09: 00000000004002e0 [ 79.332813][ T6893] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402440 [ 79.340765][ T6893] R13: 00000000004024d0 R14: 0000000000000000 R15: 0000000000000000 [ 79.348732][ T6893] [ 79.351042][ T6893] Allocated by task 6892: [ 79.355359][ T6893] __kasan_kmalloc+0x103/0x140 [ 79.360106][ T6893] __alloc_skb+0xde/0x4f0 [ 79.364414][ T6893] netlink_sendmsg+0x7b2/0xd70 [ 79.369154][ T6893] ____sys_sendmsg+0x519/0x800 [ 79.373894][ T6893] __sys_sendmsg+0x2b1/0x360 [ 79.378458][ T6893] do_syscall_64+0x73/0xe0 [ 79.382864][ T6893] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 79.388861][ T6893] [ 79.391222][ T6893] Freed by task 6892: [ 79.395193][ T6893] __kasan_slab_free+0x114/0x170 [ 79.400115][ T6893] kfree+0x10a/0x220 [ 79.403986][ T6893] __kfree_skb+0x56/0x1c0 [ 79.408310][ T6893] netlink_unicast+0x78e/0x940 [ 79.413051][ T6893] netlink_sendmsg+0xa57/0xd70 [ 79.417787][ T6893] ____sys_sendmsg+0x519/0x800 [ 79.422526][ T6893] __sys_sendmsg+0x2b1/0x360 [ 79.427146][ T6893] do_syscall_64+0x73/0xe0 [ 79.431619][ T6893] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 79.437608][ T6893] [ 79.439913][ T6893] The buggy address belongs to the object at ffff8880a4b0a800 [ 79.439913][ T6893] which belongs to the cache kmalloc-512 of size 512 [ 79.454098][ T6893] The buggy address is located 20 bytes inside of [ 79.454098][ T6893] 512-byte region [ffff8880a4b0a800, ffff8880a4b0aa00) [ 79.467435][ T6893] The buggy address belongs to the page: [ 79.473343][ T6893] page:ffffea000292c280 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 79.482443][ T6893] flags: 0xfffe0000000200(slab) [ 79.487715][ T6893] raw: 00fffe0000000200 ffffea00027f8d08 ffffea00029ebe88 ffff8880aa400a80 [ 79.496290][ T6893] raw: 0000000000000000 ffff8880a4b0a000 0000000100000004 0000000000000000 [ 79.504860][ T6893] page dumped because: kasan: bad access detected [ 79.511246][ T6893] [ 79.513573][ T6893] Memory state around the buggy address: [ 79.519186][ T6893] ffff8880a4b0a700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 79.527226][ T6893] ffff8880a4b0a780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 79.535269][ T6893] >ffff8880a4b0a800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 79.543306][ T6893] ^ [ 79.547879][ T6893] ffff8880a4b0a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 79.555918][ T6893] ffff8880a4b0a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 79.563950][ T6893] ================================================================== executing program [ 79.571983][ T6893] Disabling lock debugging due to kernel taint [ 79.598091][ T6893] Kernel panic - not syncing: panic_on_warn set ... [ 79.604690][ T6893] CPU: 0 PID: 6893 Comm: syz-executor823 Tainted: G B 5.8.0-rc2-syzkaller #0 [ 79.614735][ T6893] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.624763][ T6893] Call Trace: [ 79.628029][ T6893] dump_stack+0x1f0/0x31e [ 79.632348][ T6893] panic+0x264/0x7a0 [ 79.636226][ T6893] ? trace_hardirqs_on+0x30/0x80 [ 79.641143][ T6893] kasan_report+0x1c9/0x1d0 [ 79.645624][ T6893] ? tipc_nl_node_dump_monitor_peer+0x566/0x590 [ 79.651849][ T6893] ? __mutex_lock_common+0x582/0x2fc0 [ 79.657201][ T6893] tipc_nl_node_dump_monitor_peer+0x566/0x590 [ 79.663271][ T6893] genl_lock_dumpit+0x86/0xa0 [ 79.667931][ T6893] netlink_dump+0x4be/0x10d0 [ 79.672492][ T6893] ? __netlink_dump_start+0x530/0x700 [ 79.677836][ T6893] __netlink_dump_start+0x538/0x700 [ 79.683026][ T6893] genl_rcv_msg+0xb03/0xe00 [ 79.687505][ T6893] ? genl_rcv_msg+0xe00/0xe00 [ 79.692154][ T6893] ? genl_start+0x570/0x570 [ 79.696629][ T6893] ? genl_lock_dumpit+0xa0/0xa0 [ 79.701467][ T6893] netlink_rcv_skb+0x190/0x3a0 [ 79.706212][ T6893] ? genl_unbind+0x270/0x270 [ 79.711044][ T6893] genl_rcv+0x24/0x40 [ 79.714999][ T6893] netlink_unicast+0x786/0x940 [ 79.719741][ T6893] netlink_sendmsg+0xa57/0xd70 [ 79.724480][ T6893] ? netlink_getsockopt+0x9e0/0x9e0 [ 79.729656][ T6893] ____sys_sendmsg+0x519/0x800 [ 79.734394][ T6893] ? import_iovec+0x12a/0x2c0 [ 79.739065][ T6893] __sys_sendmsg+0x2b1/0x360 [ 79.743644][ T6893] ? rcu_lock_release+0x9/0x20 [ 79.748377][ T6893] ? __fd_install+0x251/0x490 [ 79.753036][ T6893] ? check_preemption_disabled+0x40/0x240 [ 79.758731][ T6893] ? check_preemption_disabled+0x40/0x240 [ 79.764618][ T6893] ? do_syscall_64+0x1d/0xe0 [ 79.769193][ T6893] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 79.775249][ T6893] do_syscall_64+0x73/0xe0 [ 79.779643][ T6893] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 79.785507][ T6893] RIP: 0033:0x4452a9 [ 79.789377][ T6893] Code: Bad RIP value. [ 79.793438][ T6893] RSP: 002b:00007fff822c3fa8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 79.801844][ T6893] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004452a9 [ 79.809893][ T6893] RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003 [ 79.817841][ T6893] RBP: 00000000000134d3 R08: 00000000004002e0 R09: 00000000004002e0 [ 79.825798][ T6893] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402440 [ 79.833753][ T6893] R13: 00000000004024d0 R14: 0000000000000000 R15: 0000000000000000 [ 79.843242][ T6893] Kernel Offset: disabled [ 79.847560][ T6893] Rebooting in 86400 seconds..