[....] Starting enhanced syslogd: rsyslogd[ 12.171872] audit: type=1400 audit(1518693423.254:4): avc: denied { syslog } for pid=3449 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 Warning: Permanently added '10.128.15.204' (ECDSA) to the list of known hosts. net.ipv6.conf.syz4.accept_dad = 0 net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz7.accept_dad = 0 net.ipv6.conf.syz6.accept_dad = 0 net.ipv6.conf.syz5.accept_dad = 0 net.ipv6.conf.syz3.accept_dad = 0 net.ipv6.conf.syz1.accept_dad = 0 net.ipv6.conf.syz2.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 net.ipv6.conf.syz4.router_solicitations = 0 net.ipv6.conf.syz5.router_solicitations = 0 net.ipv6.conf.syz7.router_solicitations = 0 net.ipv6.conf.syz1.router_solicitations = 0 net.ipv6.conf.syz6.router_solicitations = 0 net.ipv6.conf.syz3.router_solicitations = 0 net.ipv6.conf.syz2.router_solicitations = 0 RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "bridge0" Cannot find device "vcan0" Cannot find device "bridge0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported Cannot find device "vcan0" RTNETLINK answers: Operation not supported Cannot find device "gre0" RTNETLINK answers: Operation not supported Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" RTNETLINK answers: Operation not supported Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" executing program Cannot find device "erspan0" executing program Cannot find device "erspan0" executing program Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" executing program Cannot find device "erspan0" Cannot find device "erspan0" executing program executing program executing program executing program executing program executing program executing program executing program Cannot find device "erspan0" executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 32.946133] ================================================================== [ 32.953564] BUG: KASAN: use-after-free in l2tp_session_get+0x75b/0x770 [ 32.960199] Read of size 4 at addr ffff8801d8acf690 by task syzkaller568375/5536 [ 32.967696] [ 32.969299] CPU: 1 PID: 5536 Comm: syzkaller568375 Not tainted 4.9.81-gd2c57b6 #34 [ 32.976974] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.986298] ffff8801d9827a88 ffffffff81d94de9 ffffea000762b380 ffff8801d8acf690 [ 32.994273] 0000000000000000 ffff8801d8acf690 ffff8801c4b36f20 ffff8801d9827ac0 [ 33.002250] ffffffff8153e173 ffff8801d8acf690 0000000000000004 0000000000000000 [ 33.010225] Call Trace: [ 33.012782] [] dump_stack+0xc1/0x128 [ 33.018118] [] print_address_description+0x73/0x280 [ 33.024752] [] kasan_report+0x275/0x360 [ 33.030343] [] ? l2tp_session_get+0x75b/0x770 [ 33.036456] [] __asan_report_load4_noabort+0x14/0x20 [ 33.043180] [] l2tp_session_get+0x75b/0x770 [ 33.049119] [] ? l2tp_tunnel_find+0x2c1/0x4d0 [ 33.055234] [] pppol2tp_connect+0x510/0x18f0 [ 33.061260] [] ? pppol2tp_seq_show+0xc20/0xc20 [ 33.067466] [] ? check_stack_object+0x68/0x140 [ 33.073666] [] ? security_socket_connect+0x89/0xb0 [ 33.080214] [] SYSC_connect+0x1b6/0x310 [ 33.085809] [] ? __pmd_alloc+0x410/0x410 [ 33.091490] [] ? SYSC_bind+0x280/0x280 [ 33.096995] [] ? memset+0x31/0x40 [ 33.102071] [] ? up_read+0x1a/0x40 [ 33.107234] [] ? __do_page_fault+0x3bd/0xd40 [ 33.113263] [] SyS_connect+0x24/0x30 [ 33.118595] [] ? SyS_accept+0x30/0x30 [ 33.124017] [] do_syscall_64+0x1a5/0x490 [ 33.129697] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 33.136591] [ 33.138188] Allocated by task 5549: [ 33.141788] save_stack_trace+0x16/0x20 [ 33.145731] save_stack+0x43/0xd0 [ 33.149152] kasan_kmalloc+0xad/0xe0 [ 33.152837] __kmalloc+0x11d/0x310 [ 33.156345] l2tp_session_create+0x38/0x1770 [ 33.160721] pppol2tp_connect+0x10fe/0x18f0 [ 33.165015] SYSC_connect+0x1b6/0x310 [ 33.168786] SyS_connect+0x24/0x30 [ 33.172297] do_syscall_64+0x1a5/0x490 [ 33.176153] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 33.181221] [ 33.182818] Freed by task 5534: [ 33.186066] save_stack_trace+0x16/0x20 [ 33.190013] save_stack+0x43/0xd0 [ 33.193435] kasan_slab_free+0x72/0xc0 [ 33.197293] kfree+0x103/0x300 [ 33.200455] l2tp_session_free+0x166/0x200 [ 33.204657] pppol2tp_connect+0x108a/0x18f0 [ 33.208949] SYSC_connect+0x1b6/0x310 [ 33.212715] SyS_connect+0x24/0x30 [ 33.216222] do_syscall_64+0x1a5/0x490 [ 33.220079] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 33.225144] [ 33.226741] The buggy address belongs to the object at ffff8801d8acf680 [ 33.226741] which belongs to the cache kmalloc-512 of size 512 [ 33.239367] The buggy address is located 16 bytes inside of [ 33.239367] 512-byte region [ffff8801d8acf680, ffff8801d8acf880) [ 33.251118] The buggy address belongs to the page: [ 33.256015] page:ffffea000762b380 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 [ 33.266182] flags: 0x8000000000004080(slab|head) [ 33.270905] page dumped because: kasan: bad access detected [ 33.276581] [ 33.278177] Memory state around the buggy address: [ 33.283074] ffff8801d8acf580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.290402] ffff8801d8acf600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 33.297728] >ffff8801d8acf680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.305052] ^ [ 33.308907] ffff8801d8acf700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.316233] ffff8801d8acf780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.323558] ================================================================== [ 33.330883] Disabling lock debugging due to kernel taint [ 33.336302] ================================================================== [ 33.336389] Kernel panic - not syncing: panic_on_warn set ... [ 33.336389] [ 33.336396] CPU: 1 PID: 5536 Comm: syzkaller568375 Tainted: G B 4.9.81-gd2c57b6 #34 [ 33.336399] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.336409] ffff8801d98279e0 ffffffff81d94de9 ffffffff84197637 ffff8801d9827ab8 [ 33.336418] 0000000000000000 ffff8801d8acf690 ffff8801c4b36f20 ffff8801d9827aa8 [ 33.336426] ffffffff8142f621 0000000041b58ab3 ffffffff8418b0a8 ffffffff8142f465 [ 33.336427] Call Trace: [ 33.336435] [] dump_stack+0xc1/0x128 [ 33.336444] [] panic+0x1bc/0x3a8 [ 33.336452] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 33.336459] [] ? add_taint+0x1c/0x50 [ 33.336466] [] kasan_end_report+0x50/0x50 [ 33.336472] [] kasan_report+0x167/0x360 [ 33.336479] [] ? l2tp_session_get+0x75b/0x770 [ 33.336486] [] __asan_report_load4_noabort+0x14/0x20 [ 33.336492] [] l2tp_session_get+0x75b/0x770 [ 33.336498] [] ? l2tp_tunnel_find+0x2c1/0x4d0 [ 33.336504] [] pppol2tp_connect+0x510/0x18f0 [ 33.336511] [] ? pppol2tp_seq_show+0xc20/0xc20 [ 33.336517] [] ? check_stack_object+0x68/0x140 [ 33.336525] [] ? security_socket_connect+0x89/0xb0 [ 33.336532] [] SYSC_connect+0x1b6/0x310 [ 33.336538] [] ? __pmd_alloc+0x410/0x410 [ 33.336544] [] ? SYSC_bind+0x280/0x280 [ 33.336550] [] ? memset+0x31/0x40 [ 33.336557] [] ? up_read+0x1a/0x40 [ 33.336564] [] ? __do_page_fault+0x3bd/0xd40 [ 33.336570] [] SyS_connect+0x24/0x30 [ 33.336575] [] ? SyS_accept+0x30/0x30 [ 33.336581] [] do_syscall_64+0x1a5/0x490 [ 33.336588] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 33.535719] BUG: KASAN: double-free or invalid-free in l2tp_session_free+0x166/0x200 [ 33.543568] [ 33.545179] CPU: 0 PID: 5552 Comm: syzkaller568375 Tainted: G B 4.9.81-gd2c57b6 #34 [ 33.554070] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.563396] ffff8801d7d1fa68 ffffffff81d94de9 ffffea000762b380 ffff8801d8acf680 [ 33.571381] ffff8801da001280 ffffffff83584696 0000000000000282 ffff8801d7d1faa0 [ 33.579378] ffffffff8153e173 ffff8801d8acf680 ffffffff83584696 ffff8801da001280 [ 33.587367] Call Trace: [ 33.589927] [] dump_stack+0xc1/0x128 [ 33.595261] [] ? l2tp_session_free+0x166/0x200 [ 33.601465] [] print_address_description+0x73/0x280 [ 33.608104] [] ? l2tp_session_free+0x166/0x200 [ 33.614309] [] ? l2tp_session_free+0x166/0x200 [ 33.620515] [] kasan_report_double_free+0x64/0xa0 [ 33.626979] [] kasan_slab_free+0xa4/0xc0 [ 33.632663] [] kfree+0x103/0x300 [ 33.637651] [] l2tp_session_free+0x166/0x200 [ 33.643680] [] pppol2tp_connect+0x108a/0x18f0 [ 33.649797] [] ? pppol2tp_seq_show+0xc20/0xc20 [ 33.656002] [] ? check_stack_object+0x68/0x140 [ 33.662206] [] ? security_socket_connect+0x89/0xb0 [ 33.668761] [] SYSC_connect+0x1b6/0x310 [ 33.674361] [] ? __pmd_alloc+0x410/0x410 [ 33.680047] [] ? SYSC_bind+0x280/0x280 [ 33.685557] [] ? up_read+0x1a/0x40 [ 33.690721] [] ? __do_page_fault+0x3bd/0xd40 [ 33.696752] [] SyS_connect+0x24/0x30 [ 33.702086] [] ? SyS_accept+0x30/0x30 [ 33.707510] [] do_syscall_64+0x1a5/0x490 [ 33.713193] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 33.720087] [ 33.721687] Allocated by task 5549: [ 33.725288] save_stack_trace+0x16/0x20 [ 33.729235] save_stack+0x43/0xd0 [ 33.732660] kasan_kmalloc+0xad/0xe0 [ 33.736345] __kmalloc+0x11d/0x310 [ 33.739857] l2tp_session_create+0x38/0x1770 [ 33.744239] pppol2tp_connect+0x10fe/0x18f0 [ 33.748532] SYSC_connect+0x1b6/0x310 [ 33.752305] SyS_connect+0x24/0x30 [ 33.755815] do_syscall_64+0x1a5/0x490 [ 33.759673] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 33.764745] [ 33.766347] Freed by task 5534: [ 33.769599] save_stack_trace+0x16/0x20 [ 33.773547] save_stack+0x43/0xd0 [ 33.776974] kasan_slab_free+0x72/0xc0 [ 33.780834] kfree+0x103/0x300 [ 33.783997] l2tp_session_free+0x166/0x200 [ 33.788206] pppol2tp_connect+0x108a/0x18f0 [ 33.792500] SYSC_connect+0x1b6/0x310 [ 33.796271] SyS_connect+0x24/0x30 [ 33.799780] do_syscall_64+0x1a5/0x490 [ 33.803639] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 33.808708] [ 33.810308] The buggy address belongs to the object at ffff8801d8acf680 [ 33.810308] which belongs to the cache kmalloc-512 of size 512 [ 33.822934] The buggy address is located 0 bytes inside of [ 33.822934] 512-byte region [ffff8801d8acf680, ffff8801d8acf880) [ 33.834605] The buggy address belongs to the page: [ 33.839511] page:ffffea000762b380 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 [ 33.849690] flags: 0x8000000000004080(slab|head) [ 33.854418] page dumped because: kasan: bad access detected [ 33.860096] [ 33.861693] Memory state around the buggy address: [ 33.866597] ffff8801d8acf580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.873925] ffff8801d8acf600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 33.881257] >ffff8801d8acf680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.888583] ^ [ 33.891923] ffff8801d8acf700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.899255] ffff8801d8acf780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.906583] ================================================================== [ 33.914364] Dumping ftrace buffer: [ 33.917883] (ftrace buffer empty) [ 33.921562] Kernel Offset: disabled [ 33.925156] Rebooting in 86400 seconds..