INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?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 'ci-upstream-kasan-gce-9,10.128.15.195' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.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.syz4.accept_dad = 0 net.ipv6.conf.syz2.accept_dad = 0 net.ipv6.conf.syz7.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 net.ipv6.conf.syz6.router_solicitations = 0 net.ipv6.conf.syz5.router_solicitations = 0 net.ipv6.conf.syz1.router_solicitations = 0 net.ipv6.conf.syz3.router_solicitations = 0 net.ipv6.conf.syz2.router_solicitations = 0 net.ipv6.conf.syz4.router_solicitations = 0 net.ipv6.conf.syz7.router_solicitations = 0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 37.324078] ================================================================== [ 37.331530] BUG: KASAN: use-after-free in packet_getsockopt+0xc72/0xe00 [ 37.338269] Read of size 8 at addr ffff8801c93833d8 by task syzkaller893861/12646 [ 37.345861] [ 37.347468] CPU: 1 PID: 12646 Comm: syzkaller893861 Not tainted 4.14.0-rc1+ #93 [ 37.354885] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.364212] Call Trace: [ 37.366781] dump_stack+0x194/0x257 [ 37.370385] ? arch_local_irq_restore+0x53/0x53 [ 37.375036] ? show_regs_print_info+0x65/0x65 [ 37.379508] ? lock_release+0xd70/0xd70 [ 37.383467] ? packet_getsockopt+0xc72/0xe00 [ 37.387853] print_address_description+0x73/0x250 [ 37.392670] ? packet_getsockopt+0xc72/0xe00 [ 37.397053] kasan_report+0x24e/0x340 [ 37.400833] __asan_report_load8_noabort+0x14/0x20 [ 37.405735] packet_getsockopt+0xc72/0xe00 [ 37.409953] ? packet_notifier+0x950/0x950 [ 37.414160] ? do_raw_spin_trylock+0x190/0x190 [ 37.418722] ? __fget_light+0x29d/0x390 [ 37.422672] ? sock_has_perm+0x29c/0x400 [ 37.426711] ? selinux_tun_dev_create+0xc0/0xc0 [ 37.431360] ? trace_hardirqs_on+0xd/0x10 [ 37.435493] ? __free_pages+0xd8/0x150 [ 37.439617] ? free_hot_cold_page+0x12b0/0x12b0 [ 37.444273] ? selinux_socket_getsockopt+0x36/0x40 [ 37.449178] ? security_socket_getsockopt+0x89/0xb0 [ 37.454177] SyS_getsockopt+0x178/0x340 [ 37.458131] ? SyS_setsockopt+0x360/0x360 [ 37.462255] ? entry_SYSCALL_64_fastpath+0x5/0xbe [ 37.467075] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 37.472068] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 37.476808] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 37.481539] RIP: 0033:0x44cb99 [ 37.484705] RSP: 002b:00007f7bd051cd08 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 [ 37.492392] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044cb99 [ 37.499637] RDX: 0000000000000015 RSI: 0000000000000107 RDI: 0000000000000008 [ 37.506881] RBP: 0000000000000082 R08: 00000000208a5000 R09: 00007f7bd051d700 [ 37.514124] R10: 0000000020ec8000 R11: 0000000000000246 R12: 0000000000000000 [ 37.521370] R13: 00007fff6f768a6f R14: 00007f7bd051d9c0 R15: 0000000000000000 [ 37.528636] [ 37.530240] Allocated by task 12645: [ 37.533933] save_stack_trace+0x16/0x20 [ 37.537883] save_stack+0x43/0xd0 [ 37.541310] kasan_kmalloc+0xad/0xe0 [ 37.544998] kmem_cache_alloc_trace+0x136/0x750 [ 37.549646] fanout_add+0x345/0x1190 [ 37.553333] packet_setsockopt+0xfdc/0x1e80 [ 37.557735] SyS_setsockopt+0x189/0x360 [ 37.561685] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 37.566414] [ 37.568022] Freed by task 12645: [ 37.571363] save_stack_trace+0x16/0x20 [ 37.575311] save_stack+0x43/0xd0 [ 37.578738] kasan_slab_free+0x71/0xc0 [ 37.582600] kfree+0xca/0x250 [ 37.585688] fanout_add+0x2d0/0x1190 [ 37.589377] packet_setsockopt+0xfdc/0x1e80 [ 37.593672] SyS_setsockopt+0x189/0x360 [ 37.597620] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 37.602345] [ 37.603948] The buggy address belongs to the object at ffff8801c93833c0 [ 37.603948] which belongs to the cache kmalloc-128 of size 128 [ 37.616577] The buggy address is located 24 bytes inside of [ 37.616577] 128-byte region [ffff8801c93833c0, ffff8801c9383440) [ 37.628336] The buggy address belongs to the page: [ 37.633241] page:ffffea000724e0c0 count:1 mapcount:0 mapping:ffff8801c9383000 index:0x0 [ 37.641380] flags: 0x200000000000100(slab) [ 37.645592] raw: 0200000000000100 ffff8801c9383000 0000000000000000 0000000100000015 [ 37.653448] raw: ffffea000724d9e0 ffffea0007220060 ffff8801dac00640 0000000000000000 [ 37.661299] page dumped because: kasan: bad access detected [ 37.666980] [ 37.668580] Memory state around the buggy address: [ 37.673482] ffff8801c9383280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc [ 37.680815] ffff8801c9383300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.688146] >ffff8801c9383380: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 37.695477] ^ [ 37.701679] ffff8801c9383400: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 37.709015] ffff8801c9383480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.716349] ================================================================== [ 37.723678] Disabling lock debugging due to kernel taint [ 37.729190] Kernel panic - not syncing: panic_on_warn set ... [ 37.729190] [ 37.736529] CPU: 1 PID: 12646 Comm: syzkaller893861 Tainted: G B 4.14.0-rc1+ #93 [ 37.745157] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.754480] Call Trace: [ 37.757045] dump_stack+0x194/0x257 [ 37.760644] ? arch_local_irq_restore+0x53/0x53 [ 37.765281] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 37.770012] ? packet_getsockopt+0xc20/0xe00 [ 37.774391] panic+0x1e4/0x417 [ 37.777552] ? __warn+0x1d9/0x1d9 [ 37.780980] ? packet_getsockopt+0xc72/0xe00 [ 37.785357] kasan_end_report+0x50/0x50 [ 37.789301] kasan_report+0x137/0x340 [ 37.793073] __asan_report_load8_noabort+0x14/0x20 [ 37.797977] packet_getsockopt+0xc72/0xe00 [ 37.802182] ? packet_notifier+0x950/0x950 [ 37.806387] ? do_raw_spin_trylock+0x190/0x190 [ 37.810942] ? __fget_light+0x29d/0x390 [ 37.814888] ? sock_has_perm+0x29c/0x400 [ 37.818922] ? selinux_tun_dev_create+0xc0/0xc0 [ 37.823562] ? trace_hardirqs_on+0xd/0x10 [ 37.827691] ? __free_pages+0xd8/0x150 [ 37.831560] ? free_hot_cold_page+0x12b0/0x12b0 [ 37.836205] ? selinux_socket_getsockopt+0x36/0x40 [ 37.841188] ? security_socket_getsockopt+0x89/0xb0 [ 37.846180] SyS_getsockopt+0x178/0x340 [ 37.850127] ? SyS_setsockopt+0x360/0x360 [ 37.854245] ? entry_SYSCALL_64_fastpath+0x5/0xbe [ 37.859061] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 37.864046] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 37.868775] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 37.873500] RIP: 0033:0x44cb99 [ 37.876657] RSP: 002b:00007f7bd051cd08 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 [ 37.884333] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044cb99 [ 37.891570] RDX: 0000000000000015 RSI: 0000000000000107 RDI: 0000000000000008 [ 37.898809] RBP: 0000000000000082 R08: 00000000208a5000 R09: 00007f7bd051d700 [ 37.906047] R10: 0000000020ec8000 R11: 0000000000000246 R12: 0000000000000000 [ 37.913285] R13: 00007fff6f768a6f R14: 00007f7bd051d9c0 R15: 0000000000000000 [ 37.920973] Dumping ftrace buffer: [ 37.924485] (ftrace buffer empty) [ 37.928171] Kernel Offset: disabled [ 37.931769] Rebooting in 86400 seconds..