[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.5' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 56.357609][ T7104] ================================================================== [ 56.365867][ T7104] BUG: KASAN: use-after-free in tipc_nl_node_dump_link+0xc4e/0xc80 [ 56.373752][ T7104] Read of size 2 at addr ffff88809f690814 by task syz-executor873/7104 [ 56.381975][ T7104] [ 56.384288][ T7104] CPU: 0 PID: 7104 Comm: syz-executor873 Not tainted 5.8.0-rc2-syzkaller #0 [ 56.392931][ T7104] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.402981][ T7104] Call Trace: [ 56.406258][ T7104] dump_stack+0x1f0/0x31e [ 56.410567][ T7104] print_address_description+0x66/0x5a0 [ 56.416091][ T7104] ? vprintk_emit+0x342/0x3c0 [ 56.420745][ T7104] ? printk+0x62/0x83 [ 56.424702][ T7104] ? vprintk_emit+0x339/0x3c0 [ 56.429358][ T7104] kasan_report+0x132/0x1d0 [ 56.433861][ T7104] ? tipc_nl_node_dump_link+0xc4e/0xc80 [ 56.439394][ T7104] tipc_nl_node_dump_link+0xc4e/0xc80 [ 56.444751][ T7104] ? genl_lock_dumpit+0x64/0xa0 [ 56.449691][ T7104] genl_lock_dumpit+0x86/0xa0 [ 56.454372][ T7104] netlink_dump+0x4be/0x10d0 [ 56.458948][ T7104] ? __netlink_dump_start+0x530/0x700 [ 56.464395][ T7104] __netlink_dump_start+0x538/0x700 [ 56.469587][ T7104] genl_rcv_msg+0xb03/0xe00 [ 56.474099][ T7104] ? genl_rcv_msg+0xe00/0xe00 [ 56.478759][ T7104] ? genl_start+0x570/0x570 [ 56.483238][ T7104] ? genl_lock_dumpit+0xa0/0xa0 [ 56.491569][ T7104] netlink_rcv_skb+0x190/0x3a0 [ 56.496313][ T7104] ? genl_unbind+0x270/0x270 [ 56.500902][ T7104] genl_rcv+0x24/0x40 [ 56.504867][ T7104] netlink_unicast+0x786/0x940 [ 56.509708][ T7104] netlink_sendmsg+0xa57/0xd70 [ 56.514483][ T7104] ? netlink_getsockopt+0x9e0/0x9e0 [ 56.519677][ T7104] ____sys_sendmsg+0x519/0x800 [ 56.524441][ T7104] ? import_iovec+0x12a/0x2c0 [ 56.529116][ T7104] __sys_sendmsg+0x2b1/0x360 [ 56.533692][ T7104] ? do_raw_spin_unlock+0x134/0x8d0 [ 56.538971][ T7104] ? check_preemption_disabled+0x40/0x240 [ 56.544682][ T7104] ? check_preemption_disabled+0x40/0x240 [ 56.550376][ T7104] ? check_preemption_disabled+0x40/0x240 [ 56.556088][ T7104] ? do_syscall_64+0x1d/0xe0 [ 56.560660][ T7104] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.566734][ T7104] do_syscall_64+0x73/0xe0 [ 56.571129][ T7104] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.576997][ T7104] RIP: 0033:0x4456f9 [ 56.580864][ T7104] Code: Bad RIP value. [ 56.584904][ T7104] RSP: 002b:00007fff635d96c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 56.593293][ T7104] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004456f9 [ 56.603064][ T7104] RDX: 0000000020004014 RSI: 00000000200000c0 RDI: 0000000000000003 [ 56.611015][ T7104] RBP: 000000000000dc10 R08: 0000000000000000 R09: 00000000004002e0 [ 56.618982][ T7104] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402890 [ 56.626935][ T7104] R13: 0000000000402920 R14: 0000000000000000 R15: 0000000000000000 [ 56.634904][ T7104] [ 56.637208][ T7104] Allocated by task 7105: [ 56.641522][ T7104] __kasan_kmalloc+0x103/0x140 [ 56.646264][ T7104] __alloc_skb+0xde/0x4f0 [ 56.650575][ T7104] netlink_sendmsg+0x7b2/0xd70 [ 56.655335][ T7104] ____sys_sendmsg+0x519/0x800 [ 56.660070][ T7104] __sys_sendmsg+0x2b1/0x360 [ 56.664643][ T7104] do_syscall_64+0x73/0xe0 [ 56.669033][ T7104] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.674899][ T7104] [ 56.677212][ T7104] Freed by task 7105: [ 56.681169][ T7104] __kasan_slab_free+0x114/0x170 [ 56.686082][ T7104] kfree+0x10a/0x220 [ 56.689955][ T7104] __kfree_skb+0x56/0x1c0 [ 56.694260][ T7104] netlink_unicast+0x78e/0x940 [ 56.699001][ T7104] netlink_sendmsg+0xa57/0xd70 [ 56.703738][ T7104] ____sys_sendmsg+0x519/0x800 [ 56.708475][ T7104] __sys_sendmsg+0x2b1/0x360 [ 56.713039][ T7104] do_syscall_64+0x73/0xe0 [ 56.717433][ T7104] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.723295][ T7104] [ 56.725602][ T7104] The buggy address belongs to the object at ffff88809f690800 [ 56.725602][ T7104] which belongs to the cache kmalloc-1k of size 1024 [ 56.739638][ T7104] The buggy address is located 20 bytes inside of [ 56.739638][ T7104] 1024-byte region [ffff88809f690800, ffff88809f690c00) [ 56.752906][ T7104] The buggy address belongs to the page: [ 56.758535][ T7104] page:ffffea00027da400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 56.767622][ T7104] flags: 0xfffe0000000200(slab) [ 56.772452][ T7104] raw: 00fffe0000000200 ffffea0002403dc8 ffffea000240b108 ffff8880aa400c40 [ 56.781012][ T7104] raw: 0000000000000000 ffff88809f690000 0000000100000002 0000000000000000 [ 56.789916][ T7104] page dumped because: kasan: bad access detected [ 56.796300][ T7104] [ 56.798607][ T7104] Memory state around the buggy address: executing program [ 56.804228][ T7104] ffff88809f690700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 56.812295][ T7104] ffff88809f690780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 56.820768][ T7104] >ffff88809f690800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 56.828809][ T7104] ^ [ 56.833376][ T7104] ffff88809f690880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 56.841412][ T7104] ffff88809f690900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 56.849460][ T7104] ================================================================== [ 56.857494][ T7104] Disabling lock debugging due to kernel taint [ 56.867047][ T7104] Kernel panic - not syncing: panic_on_warn set ... [ 56.873658][ T7104] CPU: 0 PID: 7104 Comm: syz-executor873 Tainted: G B 5.8.0-rc2-syzkaller #0 [ 56.883707][ T7104] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.893747][ T7104] Call Trace: [ 56.897019][ T7104] dump_stack+0x1f0/0x31e [ 56.901321][ T7104] panic+0x264/0x7a0 [ 56.905188][ T7104] ? trace_hardirqs_on+0x30/0x80 [ 56.910098][ T7104] kasan_report+0x1c9/0x1d0 [ 56.914575][ T7104] ? tipc_nl_node_dump_link+0xc4e/0xc80 [ 56.920117][ T7104] tipc_nl_node_dump_link+0xc4e/0xc80 [ 56.925464][ T7104] ? genl_lock_dumpit+0x64/0xa0 [ 56.930288][ T7104] genl_lock_dumpit+0x86/0xa0 [ 56.934940][ T7104] netlink_dump+0x4be/0x10d0 [ 56.939509][ T7104] ? __netlink_dump_start+0x530/0x700 [ 56.944864][ T7104] __netlink_dump_start+0x538/0x700 [ 56.950038][ T7104] genl_rcv_msg+0xb03/0xe00 [ 56.954516][ T7104] ? genl_rcv_msg+0xe00/0xe00 [ 56.959179][ T7104] ? genl_start+0x570/0x570 [ 56.963653][ T7104] ? genl_lock_dumpit+0xa0/0xa0 [ 56.968484][ T7104] netlink_rcv_skb+0x190/0x3a0 [ 56.973219][ T7104] ? genl_unbind+0x270/0x270 [ 56.977860][ T7104] genl_rcv+0x24/0x40 [ 56.981837][ T7104] netlink_unicast+0x786/0x940 [ 56.986580][ T7104] netlink_sendmsg+0xa57/0xd70 [ 56.991321][ T7104] ? netlink_getsockopt+0x9e0/0x9e0 [ 56.996548][ T7104] ____sys_sendmsg+0x519/0x800 [ 57.001292][ T7104] ? import_iovec+0x12a/0x2c0 [ 57.005950][ T7104] __sys_sendmsg+0x2b1/0x360 [ 57.011301][ T7104] ? do_raw_spin_unlock+0x134/0x8d0 [ 57.016475][ T7104] ? check_preemption_disabled+0x40/0x240 [ 57.022166][ T7104] ? check_preemption_disabled+0x40/0x240 [ 57.027856][ T7104] ? check_preemption_disabled+0x40/0x240 [ 57.033549][ T7104] ? do_syscall_64+0x1d/0xe0 [ 57.038160][ T7104] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.044206][ T7104] do_syscall_64+0x73/0xe0 [ 57.048615][ T7104] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.054491][ T7104] RIP: 0033:0x4456f9 [ 57.058375][ T7104] Code: Bad RIP value. [ 57.062412][ T7104] RSP: 002b:00007fff635d96c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 57.070814][ T7104] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004456f9 [ 57.078758][ T7104] RDX: 0000000020004014 RSI: 00000000200000c0 RDI: 0000000000000003 [ 57.086703][ T7104] RBP: 000000000000dc10 R08: 0000000000000000 R09: 00000000004002e0 [ 57.094648][ T7104] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402890 [ 57.102602][ T7104] R13: 0000000000402920 R14: 0000000000000000 R15: 0000000000000000 [ 57.111657][ T7104] Kernel Offset: disabled [ 57.115972][ T7104] Rebooting in 86400 seconds..