[....] Starting enhanced syslogd: rsyslogd[ 15.628942] audit: type=1400 audit(1520598963.993:5): avc: denied { syslog } for pid=4024 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 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: [ 19.588181] audit: type=1400 audit(1520598967.953:6): avc: denied { map } for pid=4163 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 '10.128.0.61' (ECDSA) to the list of known hosts. net.ipv6.conf.syz_tun.accept_dad = 0 net.ipv6.conf.syz_tun.router_solicitations = 0 [ 25.900853] audit: type=1400 audit(1520598974.265:7): avc: denied { map } for pid=4177 comm="syzkaller465492" path="/root/syzkaller465492221" 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 [ 25.908535] IPVS: ftp: loaded support on port[0] = 21 RTNETLINK answers: File exists RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 26.177620] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument [ 26.530474] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 26.536571] 8021q: adding VLAN 0 to HW filter on device bond0 executing program [ 26.573867] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 26.613187] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 26.626095] ================================================================== [ 26.633518] BUG: KASAN: slab-out-of-bounds in ip6_xmit+0x1f76/0x2260 [ 26.639990] Read of size 8 at addr ffff8801b8286118 by task syzkaller465492/4178 [ 26.647493] [ 26.649099] CPU: 0 PID: 4178 Comm: syzkaller465492 Not tainted 4.16.0-rc4+ #258 [ 26.656517] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.665842] Call Trace: [ 26.668402] dump_stack+0x194/0x24d [ 26.672002] ? arch_local_irq_restore+0x53/0x53 [ 26.676885] ? show_regs_print_info+0x18/0x18 [ 26.681360] ? ip6_xmit+0x1f76/0x2260 [ 26.685134] print_address_description+0x73/0x250 [ 26.689948] ? ip6_xmit+0x1f76/0x2260 [ 26.693743] kasan_report+0x23c/0x360 [ 26.697521] __asan_report_load8_noabort+0x14/0x20 [ 26.702421] ip6_xmit+0x1f76/0x2260 [ 26.706045] ? ip6_finish_output2+0x23d0/0x23d0 [ 26.710691] ? fl6_update_dst+0x127/0x2b0 [ 26.714816] ? inet6_csk_route_socket+0x691/0xe80 [ 26.719641] ? trace_hardirqs_off+0x10/0x10 [ 26.723937] ? lock_acquire+0x1d5/0x580 [ 26.727880] ? lock_acquire+0x1d5/0x580 [ 26.731824] ? inet6_csk_xmit+0x114/0x580 [ 26.735942] ? trace_hardirqs_off+0x10/0x10 [ 26.740240] ? lock_release+0xa40/0xa40 [ 26.744204] inet6_csk_xmit+0x2fc/0x580 [ 26.748152] ? inet6_csk_update_pmtu+0x160/0x160 [ 26.752881] ? __sk_dst_check+0x1a5/0x380 [ 26.757023] ? sock_kzfree_s+0x60/0x60 [ 26.760906] l2tp_xmit_skb+0x105f/0x1410 [ 26.764951] ? l2tp_session_create+0xb80/0xb80 [ 26.769503] ? sock_wmalloc+0x15d/0x1d0 [ 26.773449] ? iov_iter_advance+0x13f0/0x13f0 [ 26.777920] ? pppol2tp_sendmsg+0x41b/0x670 [ 26.782214] pppol2tp_sendmsg+0x470/0x670 [ 26.786336] ? selinux_socket_sendmsg+0x36/0x40 [ 26.790975] ? pppol2tp_getsockopt+0x900/0x900 [ 26.795529] sock_sendmsg+0xca/0x110 [ 26.799215] ___sys_sendmsg+0x767/0x8b0 [ 26.803164] ? copy_msghdr_from_user+0x590/0x590 [ 26.807898] ? __pmd_alloc+0x4e0/0x4e0 [ 26.811766] ? trace_hardirqs_off+0x10/0x10 [ 26.816061] ? find_held_lock+0x35/0x1d0 [ 26.820105] ? __fget_light+0x2b2/0x3c0 [ 26.824053] ? fget_raw+0x20/0x20 [ 26.827493] ? __do_page_fault+0x5f7/0xc90 [ 26.831699] ? lock_downgrade+0x980/0x980 [ 26.835826] __sys_sendmsg+0xe5/0x210 [ 26.839597] ? __sys_sendmsg+0xe5/0x210 [ 26.843545] ? SyS_shutdown+0x290/0x290 [ 26.847501] ? __do_page_fault+0x3d6/0xc90 [ 26.851719] ? move_addr_to_kernel+0x60/0x60 [ 26.856116] SyS_sendmsg+0x2d/0x50 [ 26.859635] ? __sys_sendmsg+0x210/0x210 [ 26.863669] do_syscall_64+0x281/0x940 [ 26.867526] ? __do_page_fault+0xc90/0xc90 [ 26.871733] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.876461] ? syscall_return_slowpath+0x550/0x550 [ 26.881362] ? syscall_return_slowpath+0x2ac/0x550 [ 26.886264] ? prepare_exit_to_usermode+0x350/0x350 [ 26.891259] ? retint_user+0x18/0x18 [ 26.894950] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.899769] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 26.904928] RIP: 0033:0x441e49 [ 26.908089] RSP: 002b:00007fffac089458 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 26.915780] RAX: ffffffffffffffda RBX: 000000000000001a RCX: 0000000000441e49 [ 26.923027] RDX: 0000000000000081 RSI: 000000002037ffc8 RDI: 0000000000000004 [ 26.930269] RBP: 00000000004a39bc R08: 0000000000000000 R09: 0000000000000000 [ 26.937508] R10: 0000000000000000 R11: 0000000000000217 R12: 00007fffac089520 [ 26.944749] R13: 0000000000402bd0 R14: 0000000000000000 R15: 0000000000000000 [ 26.952002] [ 26.953607] Allocated by task 0: [ 26.956940] (stack is not available) [ 26.960619] [ 26.962216] Freed by task 0: [ 26.965200] (stack is not available) [ 26.968878] [ 26.970477] The buggy address belongs to the object at ffff8801b8286100 [ 26.970477] which belongs to the cache ip_dst_cache of size 160 [ 26.983191] The buggy address is located 24 bytes inside of [ 26.983191] 160-byte region [ffff8801b8286100, ffff8801b82861a0) [ 26.994945] The buggy address belongs to the page: [ 26.999843] page:ffffea0006e0a180 count:1 mapcount:0 mapping:ffff8801b8286000 index:0x0 [ 27.007956] flags: 0x2fffc0000000100(slab) [ 27.012161] raw: 02fffc0000000100 ffff8801b8286000 0000000000000000 0000000100000010 [ 27.020016] raw: ffffea000701aaa0 ffff8801d5b17948 ffff8801d5b4f980 0000000000000000 [ 27.027871] page dumped because: kasan: bad access detected [ 27.033546] [ 27.035144] Memory state around the buggy address: [ 27.040046] ffff8801b8286000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 27.047374] ffff8801b8286080: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc [ 27.054702] >ffff8801b8286100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.062037] ^ [ 27.066157] ffff8801b8286180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.073486] ffff8801b8286200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.080811] ================================================================== [ 27.088137] Disabling lock debugging due to kernel taint [ 27.093583] Kernel panic - not syncing: panic_on_warn set ... [ 27.093583] [ 27.100927] CPU: 0 PID: 4178 Comm: syzkaller465492 Tainted: G B 4.16.0-rc4+ #258 [ 27.109645] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.118966] Call Trace: [ 27.121526] dump_stack+0x194/0x24d [ 27.125123] ? arch_local_irq_restore+0x53/0x53 [ 27.129760] ? kasan_end_report+0x32/0x50 [ 27.133878] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 27.138601] ? vsnprintf+0x1ed/0x1900 [ 27.142375] ? ip6_xmit+0x1ee0/0x2260 [ 27.146143] panic+0x1e4/0x41c [ 27.149309] ? refcount_error_report+0x214/0x214 [ 27.154035] ? add_taint+0x1c/0x50 [ 27.157546] ? add_taint+0x1c/0x50 [ 27.161058] ? ip6_xmit+0x1f76/0x2260 [ 27.164827] kasan_end_report+0x50/0x50 [ 27.168771] kasan_report+0x149/0x360 [ 27.172556] __asan_report_load8_noabort+0x14/0x20 [ 27.177455] ip6_xmit+0x1f76/0x2260 [ 27.181060] ? ip6_finish_output2+0x23d0/0x23d0 [ 27.185701] ? fl6_update_dst+0x127/0x2b0 [ 27.189821] ? inet6_csk_route_socket+0x691/0xe80 [ 27.194635] ? trace_hardirqs_off+0x10/0x10 [ 27.198927] ? lock_acquire+0x1d5/0x580 [ 27.202867] ? lock_acquire+0x1d5/0x580 [ 27.206807] ? inet6_csk_xmit+0x114/0x580 [ 27.210923] ? trace_hardirqs_off+0x10/0x10 [ 27.215214] ? lock_release+0xa40/0xa40 [ 27.219164] inet6_csk_xmit+0x2fc/0x580 [ 27.223109] ? inet6_csk_update_pmtu+0x160/0x160 [ 27.227837] ? __sk_dst_check+0x1a5/0x380 [ 27.231955] ? sock_kzfree_s+0x60/0x60 [ 27.235820] l2tp_xmit_skb+0x105f/0x1410 [ 27.239854] ? l2tp_session_create+0xb80/0xb80 [ 27.244408] ? sock_wmalloc+0x15d/0x1d0 [ 27.248351] ? iov_iter_advance+0x13f0/0x13f0 [ 27.252814] ? pppol2tp_sendmsg+0x41b/0x670 [ 27.257104] pppol2tp_sendmsg+0x470/0x670 [ 27.261223] ? selinux_socket_sendmsg+0x36/0x40 [ 27.265877] ? pppol2tp_getsockopt+0x900/0x900 [ 27.270430] sock_sendmsg+0xca/0x110 [ 27.274114] ___sys_sendmsg+0x767/0x8b0 [ 27.278060] ? copy_msghdr_from_user+0x590/0x590 [ 27.282785] ? __pmd_alloc+0x4e0/0x4e0 [ 27.286645] ? trace_hardirqs_off+0x10/0x10 [ 27.290934] ? find_held_lock+0x35/0x1d0 [ 27.294968] ? __fget_light+0x2b2/0x3c0 [ 27.298913] ? fget_raw+0x20/0x20 [ 27.302346] ? __do_page_fault+0x5f7/0xc90 [ 27.306549] ? lock_downgrade+0x980/0x980 [ 27.310670] __sys_sendmsg+0xe5/0x210 [ 27.314439] ? __sys_sendmsg+0xe5/0x210 [ 27.318381] ? SyS_shutdown+0x290/0x290 [ 27.322328] ? __do_page_fault+0x3d6/0xc90 [ 27.326542] ? move_addr_to_kernel+0x60/0x60 [ 27.330924] SyS_sendmsg+0x2d/0x50 [ 27.334439] ? __sys_sendmsg+0x210/0x210 [ 27.338470] do_syscall_64+0x281/0x940 [ 27.342327] ? __do_page_fault+0xc90/0xc90 [ 27.346530] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 27.351265] ? syscall_return_slowpath+0x550/0x550 [ 27.356164] ? syscall_return_slowpath+0x2ac/0x550 [ 27.361063] ? prepare_exit_to_usermode+0x350/0x350 [ 27.366050] ? retint_user+0x18/0x18 [ 27.369733] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.374546] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 27.379702] RIP: 0033:0x441e49 [ 27.382862] RSP: 002b:00007fffac089458 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 27.390536] RAX: ffffffffffffffda RBX: 000000000000001a RCX: 0000000000441e49 [ 27.397774] RDX: 0000000000000081 RSI: 000000002037ffc8 RDI: 0000000000000004 [ 27.405018] RBP: 00000000004a39bc R08: 0000000000000000 R09: 0000000000000000 [ 27.412269] R10: 0000000000000000 R11: 0000000000000217 R12: 00007fffac089520 [ 27.419508] R13: 0000000000402bd0 R14: 0000000000000000 R15: 0000000000000000 [ 27.427166] Dumping ftrace buffer: [ 27.430674] (ftrace buffer empty) [ 27.434371] Kernel Offset: disabled [ 27.437967] Rebooting in 86400 seconds..