Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.218' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 27.592264] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 44.922582] ================================================================== [ 44.930044] BUG: KASAN: use-after-free in pppol2tp_session_init+0x4b4/0x4d0 [ 44.937124] Read of size 8 at addr ffff8880b57df9a8 by task syz-executor802/13150 [ 44.944835] [ 44.946444] CPU: 1 PID: 13150 Comm: syz-executor802 Not tainted 4.14.237-syzkaller #0 [ 44.954387] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.963807] Call Trace: [ 44.966381] dump_stack+0x1b2/0x281 [ 44.969994] print_address_description.cold+0x54/0x1d3 [ 44.975269] kasan_report_error.cold+0x8a/0x191 [ 44.979935] ? pppol2tp_session_init+0x4b4/0x4d0 [ 44.984674] __asan_report_load8_noabort+0x68/0x70 [ 44.989582] ? pppol2tp_session_init+0x4b4/0x4d0 [ 44.994314] pppol2tp_session_init+0x4b4/0x4d0 [ 44.998874] pppol2tp_connect+0xd11/0x1370 [ 45.003135] ? pppol2tp_recv_payload_hook+0x1a0/0x1a0 [ 45.008369] ? lock_acquire+0x170/0x3f0 [ 45.012334] ? lock_downgrade+0x740/0x740 [ 45.016579] ? security_socket_connect+0x83/0xb0 [ 45.021314] ? pppol2tp_recv_payload_hook+0x1a0/0x1a0 [ 45.026479] SyS_connect+0x1f4/0x240 [ 45.030281] ? SyS_accept+0x30/0x30 [ 45.033900] ? up_read+0x17/0x30 [ 45.037250] ? __do_page_fault+0x159/0xad0 [ 45.041464] ? do_syscall_64+0x4c/0x640 [ 45.045414] ? SyS_accept+0x30/0x30 [ 45.049023] do_syscall_64+0x1d5/0x640 [ 45.052910] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 45.058077] RIP: 0033:0x440ee9 [ 45.061258] RSP: 002b:00007ffd382ffe38 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 45.068941] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000440ee9 [ 45.076187] RDX: 000000000000002e RSI: 0000000020000000 RDI: 0000000000000003 [ 45.083432] RBP: 0000000000000000 R08: 00007ffd382ffe80 R09: 00007ffd382ffe80 [ 45.090678] R10: 00007ffd382ffe80 R11: 0000000000000246 R12: 00007ffd382ffe6c [ 45.098051] R13: 00007ffd382ffe80 R14: 00007ffd382ffec0 R15: 0000000000001422 [ 45.105305] [ 45.106908] Allocated by task 13136: [ 45.110601] kasan_kmalloc+0xeb/0x160 [ 45.114396] kmem_cache_alloc+0x124/0x3c0 [ 45.118526] sk_prot_alloc+0x5f/0x290 [ 45.122307] sk_alloc+0x36/0xcd0 [ 45.125663] inet6_create+0x2df/0xe20 [ 45.129485] __sock_create+0x303/0x620 [ 45.133438] SyS_socket+0xd1/0x1b0 [ 45.136973] do_syscall_64+0x1d5/0x640 [ 45.140852] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 45.146032] [ 45.147635] Freed by task 13150: [ 45.150981] kasan_slab_free+0xc3/0x1a0 [ 45.154931] kmem_cache_free+0x7c/0x2b0 [ 45.158905] __sk_destruct+0x442/0x760 [ 45.162766] __sk_free+0xd9/0x2d0 [ 45.166193] sk_free+0x2b/0x40 [ 45.169360] l2tp_session_free+0x1a0/0x200 [ 45.173576] pppol2tp_session_destruct+0xcd/0x110 [ 45.178402] __sk_destruct+0x49/0x760 [ 45.182238] __sk_free+0xd9/0x2d0 [ 45.185693] sk_free+0x2b/0x40 [ 45.188864] pppol2tp_put_sk+0x4c/0x60 [ 45.192733] rcu_process_callbacks+0x780/0x1180 [ 45.197381] __do_softirq+0x24d/0x9ff [ 45.201151] [ 45.202757] The buggy address belongs to the object at ffff8880b57df780 [ 45.202757] which belongs to the cache UDPv6 of size 1728 [ 45.214954] The buggy address is located 552 bytes inside of [ 45.214954] 1728-byte region [ffff8880b57df780, ffff8880b57dfe40) [ 45.226889] The buggy address belongs to the page: [ 45.231795] page:ffffea0002d5f7c0 count:1 mapcount:0 mapping:ffff8880b57df040 index:0x0 [ 45.239916] flags: 0xfff00000000100(slab) [ 45.244041] raw: 00fff00000000100 ffff8880b57df040 0000000000000000 0000000100000002 [ 45.252167] raw: ffffea0002d3e5e0 ffffea00027b7260 ffff8882354b31c0 0000000000000000 [ 45.260034] page dumped because: kasan: bad access detected [ 45.265722] [ 45.267326] Memory state around the buggy address: [ 45.272231] ffff8880b57df880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.279569] ffff8880b57df900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.286909] >ffff8880b57df980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.294241] ^ [ 45.298886] ffff8880b57dfa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.306223] ffff8880b57dfa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.313554] ================================================================== [ 45.320910] Disabling lock debugging due to kernel taint [ 45.328701] Kernel panic - not syncing: panic_on_warn set ... [ 45.328701] [ 45.336089] CPU: 1 PID: 13150 Comm: syz-executor802 Tainted: G B 4.14.237-syzkaller #0 [ 45.345262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.354625] Call Trace: [ 45.357193] dump_stack+0x1b2/0x281 [ 45.360809] panic+0x1f9/0x42d [ 45.363975] ? add_taint.cold+0x16/0x16 [ 45.367936] ? ___preempt_schedule+0x16/0x18 [ 45.372330] kasan_end_report+0x43/0x49 [ 45.376279] kasan_report_error.cold+0xa7/0x191 [ 45.380937] ? pppol2tp_session_init+0x4b4/0x4d0 [ 45.385668] __asan_report_load8_noabort+0x68/0x70 [ 45.390572] ? pppol2tp_session_init+0x4b4/0x4d0 [ 45.395320] pppol2tp_session_init+0x4b4/0x4d0 [ 45.399876] pppol2tp_connect+0xd11/0x1370 [ 45.404083] ? pppol2tp_recv_payload_hook+0x1a0/0x1a0 [ 45.409248] ? lock_acquire+0x170/0x3f0 [ 45.413196] ? lock_downgrade+0x740/0x740 [ 45.417321] ? security_socket_connect+0x83/0xb0 [ 45.422056] ? pppol2tp_recv_payload_hook+0x1a0/0x1a0 [ 45.427219] SyS_connect+0x1f4/0x240 [ 45.430908] ? SyS_accept+0x30/0x30 [ 45.434510] ? up_read+0x17/0x30 [ 45.437868] ? __do_page_fault+0x159/0xad0 [ 45.442077] ? do_syscall_64+0x4c/0x640 [ 45.446022] ? SyS_accept+0x30/0x30 [ 45.449619] do_syscall_64+0x1d5/0x640 [ 45.453483] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 45.458646] RIP: 0033:0x440ee9 [ 45.461809] RSP: 002b:00007ffd382ffe38 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 45.469493] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000440ee9 [ 45.476737] RDX: 000000000000002e RSI: 0000000020000000 RDI: 0000000000000003 [ 45.483999] RBP: 0000000000000000 R08: 00007ffd382ffe80 R09: 00007ffd382ffe80 [ 45.491243] R10: 00007ffd382ffe80 R11: 0000000000000246 R12: 00007ffd382ffe6c [ 45.498503] R13: 00007ffd382ffe80 R14: 00007ffd382ffec0 R15: 0000000000001422 [ 45.505817] Kernel Offset: disabled [ 45.509437] Rebooting in 86400 seconds..