[ 15.778950] rsyslogd (4007) used greatest stack depth: 16480 bytes left [?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.079426] audit: type=1400 audit(1518021574.136:6): avc: denied { map } for pid=4155 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.15.216' (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 [ 40.552509] audit: type=1400 audit(1518021595.609:7): avc: denied { map } for pid=4172 comm="syzkaller477383" path="/root/syzkaller477383843" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 51.514288] ================================================================== [ 51.522029] BUG: KASAN: use-after-free in pppol2tp_connect+0x1a91/0x1dd0 [ 51.528963] Read of size 8 at addr ffff8801aa6812e8 by task syzkaller477383/6428 [ 51.536473] [ 51.538077] CPU: 1 PID: 6428 Comm: syzkaller477383 Not tainted 4.15.0+ #301 [ 51.545152] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.554481] Call Trace: [ 51.557055] dump_stack+0x194/0x257 [ 51.560694] ? arch_local_irq_restore+0x53/0x53 [ 51.565338] ? show_regs_print_info+0x18/0x18 [ 51.571120] ? lock_release+0xa40/0xa40 [ 51.575080] ? pppol2tp_connect+0x1a91/0x1dd0 [ 51.579553] print_address_description+0x73/0x250 [ 51.584377] ? pppol2tp_connect+0x1a91/0x1dd0 [ 51.588849] kasan_report+0x23b/0x360 [ 51.592634] __asan_report_load8_noabort+0x14/0x20 [ 51.597627] pppol2tp_connect+0x1a91/0x1dd0 [ 51.601940] ? pppol2tp_recv_payload_hook+0x1b0/0x1b0 [ 51.607120] ? selinux_netlbl_socket_connect+0x76/0x1b0 [ 51.612463] ? selinux_socket_connect+0x311/0x730 [ 51.617284] ? lock_downgrade+0x980/0x980 [ 51.621408] ? selinux_socket_setsockopt+0x80/0x80 [ 51.626311] ? lock_release+0xa40/0xa40 [ 51.630260] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 51.636118] ? __check_object_size+0x8b/0x530 [ 51.640595] ? __might_sleep+0x95/0x190 [ 51.644560] ? security_socket_connect+0x89/0xb0 [ 51.649587] SYSC_connect+0x213/0x4a0 [ 51.653540] ? SYSC_bind+0x410/0x410 [ 51.657243] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 51.661798] ? vmacache_find+0x5f/0x280 [ 51.665768] ? mm_fault_error+0x2c0/0x2c0 [ 51.669889] ? move_addr_to_kernel+0x60/0x60 [ 51.674290] SyS_connect+0x24/0x30 [ 51.677804] ? SyS_accept+0x30/0x30 [ 51.681405] do_syscall_64+0x282/0x940 [ 51.685275] ? __do_page_fault+0xc90/0xc90 [ 51.689484] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 51.694218] ? syscall_return_slowpath+0x550/0x550 [ 51.699122] ? syscall_return_slowpath+0x2ac/0x550 [ 51.704027] ? prepare_exit_to_usermode+0x350/0x350 [ 51.709021] ? retint_user+0x18/0x18 [ 51.712711] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.717545] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 51.722716] RIP: 0033:0x441659 [ 51.725877] RSP: 002b:00007ffdc330b9e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 51.733560] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441659 [ 51.740812] RDX: 000000000000002e RSI: 00000000205fafd2 RDI: 0000000000000004 [ 51.748057] RBP: 000000000000c933 R08: 000000000000c933 R09: 000000000000c933 [ 51.755302] R10: 000000000000c933 R11: 0000000000000246 R12: 0000000000000000 [ 51.762563] R13: 0000000000000003 R14: 00000000006cf050 R15: 00000000004a2e6e [ 51.769827] [ 51.771434] Allocated by task 6426: [ 51.775037] save_stack+0x43/0xd0 [ 51.778463] kasan_kmalloc+0xad/0xe0 [ 51.782148] kasan_slab_alloc+0x12/0x20 [ 51.786094] kmem_cache_alloc+0x12e/0x760 [ 51.790215] sk_prot_alloc+0x65/0x2a0 [ 51.793986] sk_alloc+0x105/0x1440 [ 51.797498] inet6_create+0x44d/0x10f0 [ 51.801359] __sock_create+0x4d4/0x850 [ 51.805218] SyS_socket+0xeb/0x1d0 [ 51.808728] do_syscall_64+0x282/0x940 [ 51.812590] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 51.817753] [ 51.819353] Freed by task 6428: [ 51.822612] save_stack+0x43/0xd0 [ 51.826040] __kasan_slab_free+0x11a/0x170 [ 51.830249] kasan_slab_free+0xe/0x10 [ 51.834022] kmem_cache_free+0x83/0x2a0 [ 51.838155] __sk_destruct+0x628/0x920 [ 51.842030] rcu_process_callbacks+0xd6c/0x17f0 [ 51.846678] __do_softirq+0x2d7/0xb85 [ 51.850449] [ 51.852052] The buggy address belongs to the object at ffff8801aa6810c0 [ 51.852052] which belongs to the cache UDPv6 of size 1664 [ 51.864254] The buggy address is located 552 bytes inside of [ 51.864254] 1664-byte region [ffff8801aa6810c0, ffff8801aa681740) [ 51.876190] The buggy address belongs to the page: [ 51.881098] page:ffffea0006a9a040 count:1 mapcount:0 mapping:ffff8801aa6810c0 index:0x0 [ 51.889214] flags: 0x2fffc0000000100(slab) [ 51.893423] raw: 02fffc0000000100 ffff8801aa6810c0 0000000000000000 0000000100000002 [ 51.901278] raw: ffffea00074e5020 ffffea00074c8da0 ffff8801d20f26c0 0000000000000000 [ 51.909132] page dumped because: kasan: bad access detected [ 51.914813] [ 51.916413] Memory state around the buggy address: [ 51.921314] ffff8801aa681180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 51.928645] ffff8801aa681200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 51.935979] >ffff8801aa681280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 51.943310] ^ [ 51.950055] ffff8801aa681300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 51.957413] ffff8801aa681380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 51.964750] ================================================================== [ 51.972086] Disabling lock debugging due to kernel taint [ 51.977610] Kernel panic - not syncing: panic_on_warn set ... [ 51.977610] [ 51.984953] CPU: 1 PID: 6428 Comm: syzkaller477383 Tainted: G B 4.15.0+ #301 [ 51.993335] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.002667] Call Trace: [ 52.005232] dump_stack+0x194/0x257 [ 52.008838] ? arch_local_irq_restore+0x53/0x53 [ 52.013485] ? kasan_end_report+0x32/0x50 [ 52.017608] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 52.022358] ? vsnprintf+0x1ed/0x1900 [ 52.026130] ? pppol2tp_connect+0x1a10/0x1dd0 [ 52.030600] panic+0x1e4/0x41c [ 52.033764] ? refcount_error_report+0x214/0x214 [ 52.038495] ? add_taint+0x1c/0x50 [ 52.042010] ? add_taint+0x1c/0x50 [ 52.045526] ? pppol2tp_connect+0x1a91/0x1dd0 [ 52.049999] kasan_end_report+0x50/0x50 [ 52.053961] kasan_report+0x148/0x360 [ 52.057739] __asan_report_load8_noabort+0x14/0x20 [ 52.062645] pppol2tp_connect+0x1a91/0x1dd0 [ 52.066960] ? pppol2tp_recv_payload_hook+0x1b0/0x1b0 [ 52.072129] ? selinux_netlbl_socket_connect+0x76/0x1b0 [ 52.077470] ? selinux_socket_connect+0x311/0x730 [ 52.082288] ? lock_downgrade+0x980/0x980 [ 52.086410] ? selinux_socket_setsockopt+0x80/0x80 [ 52.091311] ? lock_release+0xa40/0xa40 [ 52.095258] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 52.101121] ? __check_object_size+0x8b/0x530 [ 52.105602] ? __might_sleep+0x95/0x190 [ 52.109569] ? security_socket_connect+0x89/0xb0 [ 52.114315] SYSC_connect+0x213/0x4a0 [ 52.118108] ? SYSC_bind+0x410/0x410 [ 52.121809] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 52.126368] ? vmacache_find+0x5f/0x280 [ 52.130328] ? mm_fault_error+0x2c0/0x2c0 [ 52.134453] ? move_addr_to_kernel+0x60/0x60 [ 52.138836] SyS_connect+0x24/0x30 [ 52.142367] ? SyS_accept+0x30/0x30 [ 52.145968] do_syscall_64+0x282/0x940 [ 52.149833] ? __do_page_fault+0xc90/0xc90 [ 52.154057] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 52.158789] ? syscall_return_slowpath+0x550/0x550 [ 52.163696] ? syscall_return_slowpath+0x2ac/0x550 [ 52.168600] ? prepare_exit_to_usermode+0x350/0x350 [ 52.173597] ? retint_user+0x18/0x18 [ 52.177289] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.182112] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 52.187276] RIP: 0033:0x441659 [ 52.190449] RSP: 002b:00007ffdc330b9e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 52.198142] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441659 [ 52.205388] RDX: 000000000000002e RSI: 00000000205fafd2 RDI: 0000000000000004 [ 52.212633] RBP: 000000000000c933 R08: 000000000000c933 R09: 000000000000c933 [ 52.219875] R10: 000000000000c933 R11: 0000000000000246 R12: 0000000000000000 [ 52.227118] R13: 0000000000000003 R14: 00000000006cf050 R15: 00000000004a2e6e [ 52.234777] Dumping ftrace buffer: [ 52.238292] (ftrace buffer empty) [ 52.241986] Kernel Offset: disabled [ 52.245587] Rebooting in 86400 seconds..