INIT: Entering runlevel: 2 [[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-android-49-kasan-gce-0,10.128.15.207' (ECDSA) to the list of known hosts. 2017/09/04 19:49:08 parsed 1 programs 2017/09/04 19:49:08 executed programs: 0 syzkaller login: [ 26.504724] dev_remove_pack: ffff8801c42a0780 not found 2017/09/04 19:49:13 executed programs: 181 [ 30.431731] ================================================================== [ 30.439155] BUG: KASAN: use-after-free in fanout_demux_rollover+0x49b/0x4d0 at addr ffff8801c42a0738 [ 30.448391] Read of size 8 by task swapper/0/0 [ 30.452941] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.47-g6cd2127 #39 [ 30.459833] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.469153] ffff8801db2077e0 ffffffff81d93049 ffff8801da002000 ffff8801c42a0000 [ 30.477116] ffff8801c42a0800 ffffed00388540e7 ffff8801c42a0738 ffff8801db207808 [ 30.485075] ffffffff8153cbcc ffffed00388540e7 ffff8801da002000 0000000000000000 [ 30.493023] Call Trace: [ 30.495572] [ 30.497607] [] dump_stack+0xc1/0x128 [ 30.502953] [] kasan_object_err+0x1c/0x70 [ 30.508714] [] kasan_report.part.1+0x21c/0x500 [ 30.514915] [] ? fanout_demux_rollover+0x49b/0x4d0 [ 30.521459] [] ? kfree_skbmem+0xd7/0xf0 [ 30.527051] [] __asan_report_load8_noabort+0x29/0x30 [ 30.533771] [] fanout_demux_rollover+0x49b/0x4d0 [ 30.540139] [] packet_rcv_fanout+0x3e6/0x620 [ 30.546162] [] __netif_receive_skb_core+0x887/0x29e0 [ 30.552884] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 30.559865] [] ? netif_wake_subqueue+0x210/0x210 [ 30.566236] [] ? netif_receive_skb_internal+0x92/0x390 [ 30.573127] [] __netif_receive_skb+0x5b/0x1c0 [ 30.579239] [] netif_receive_skb_internal+0xff/0x390 [ 30.585971] [] ? netif_receive_skb_internal+0x92/0x390 [ 30.592862] [] ? dev_cpu_callback+0x680/0x680 [ 30.598971] [] ? dev_gro_receive+0x1d6/0x16f0 [ 30.605080] [] ? dev_gro_receive+0x67a/0x16f0 [ 30.611189] [] ? eth_type_trans+0x2a8/0x5d0 [ 30.617133] [] napi_gro_receive+0x1fb/0x400 [ 30.623072] [] virtnet_receive+0xe1c/0x1cf0 [ 30.629007] [] ? virtnet_open+0x250/0x250 [ 30.634772] [] ? check_preemption_disabled+0x3b/0x200 [ 30.641579] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 30.648565] [] ? check_preemption_disabled+0x3b/0x200 [ 30.655370] [] ? debug_smp_processor_id+0x1c/0x20 [ 30.661826] [] virtnet_poll+0x26/0x140 [ 30.667330] [] net_rx_action+0x396/0xe00 [ 30.673005] [] ? sk_busy_loop+0xca0/0xca0 [ 30.678772] [] ? handle_edge_irq+0x417/0x8e0 [ 30.684798] [] ? _raw_spin_lock+0x3e/0x50 [ 30.690563] [] ? check_preemption_disabled+0x3b/0x200 [ 30.697370] [] __do_softirq+0x22d/0x964 [ 30.702961] [] irq_exit+0x165/0x190 [ 30.708204] [] do_IRQ+0x107/0x1b0 [ 30.713288] [] common_interrupt+0x8c/0x8c [ 30.719049] [ 30.721081] [] ? native_safe_halt+0x6/0x10 [ 30.726946] [] ? trace_hardirqs_on+0xd/0x10 [ 30.732889] [] default_idle+0x55/0x360 [ 30.738395] [] arch_cpu_idle+0xa/0x10 [ 30.743812] [] default_idle_call+0x36/0x60 [ 30.749666] [] cpu_startup_entry+0x30c/0x3d0 [ 30.755688] [] ? cpu_in_idle+0x20/0x20 [ 30.761191] [] rest_init+0x184/0x190 [ 30.766522] [] start_kernel+0x679/0x6ae [ 30.772112] [] ? thread_stack_cache_init+0xb/0xb [ 30.778486] [] ? early_idt_handler_array+0x120/0x120 [ 30.785214] [] x86_64_start_reservations+0x2a/0x2c [ 30.791762] [] x86_64_start_kernel+0x140/0x163 [ 30.797962] Object at ffff8801c42a0000, in cache kmalloc-2048 size: 2048 [ 30.804764] Allocated: [ 30.807223] PID = 3417 [ 30.809692] save_stack_trace+0x16/0x20 [ 30.813632] save_stack+0x43/0xd0 [ 30.817048] kasan_kmalloc+0xad/0xe0 [ 30.820726] __kmalloc+0x11d/0x310 [ 30.824237] sk_prot_alloc+0x101/0x2a0 [ 30.828088] sk_alloc+0x3a/0x3a0 [ 30.831421] packet_create+0xf0/0x8e0 [ 30.835183] __sock_create+0x3ab/0x640 [ 30.839034] SyS_socket+0xf0/0x1b0 [ 30.842538] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 30.847254] Freed: [ 30.849367] PID = 3419 [ 30.851834] save_stack_trace+0x16/0x20 [ 30.855772] save_stack+0x43/0xd0 [ 30.859187] kasan_slab_free+0x73/0xc0 [ 30.863038] kfree+0xf0/0x2f0 [ 30.866107] __sk_destruct+0x47f/0x570 [ 30.869956] sk_destruct+0x47/0x80 [ 30.873459] __sk_free+0x57/0x230 [ 30.876878] sk_free+0x23/0x30 [ 30.880041] packet_release+0x732/0xa20 [ 30.883981] sock_release+0x8d/0x1e0 [ 30.887658] sock_close+0x16/0x20 [ 30.891077] __fput+0x28c/0x6e0 [ 30.894333] ____fput+0x15/0x20 [ 30.897580] task_work_run+0x115/0x190 [ 30.901433] do_exit+0x82e/0x2a50 [ 30.904853] do_group_exit+0x108/0x320 [ 30.908704] get_signal+0x55c/0x1600 [ 30.912383] do_signal+0x87/0x1960 [ 30.915889] exit_to_usermode_loop+0xe5/0x130 [ 30.920350] syscall_return_slowpath+0x1a0/0x1e0 [ 30.925072] entry_SYSCALL_64_fastpath+0xc4/0xc6 [ 30.929793] Memory state around the buggy address: [ 30.934688] ffff8801c42a0600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.942013] ffff8801c42a0680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.949339] >ffff8801c42a0700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.956661] ^ [ 30.961815] ffff8801c42a0780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.969139] ffff8801c42a0800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 30.976465] ================================================================== [ 30.983839] ================================================================== [ 30.991189] BUG: KASAN: use-after-free in fanout_demux_rollover+0x4bc/0x4d0 at addr ffff8801d13b1a80 [ 31.000444] Read of size 4 by task swapper/0/0 [ 31.004998] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G B 4.9.47-g6cd2127 #39 [ 31.013105] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.022428] ffff8801db2077e0 ffffffff81d93049 ffff8801da001640 ffff8801d13b1a80 [ 31.030385] ffff8801d13b1b00 ffffed003a276350 ffff8801d13b1a80 ffff8801db207808 [ 31.038334] ffffffff8153cbcc ffffed003a276350 ffff8801da001640 0000000000000000 [ 31.046282] Call Trace: [ 31.048828] [ 31.050863] [] dump_stack+0xc1/0x128 [ 31.056317] [] kasan_object_err+0x1c/0x70 [ 31.062093] [] kasan_report.part.1+0x21c/0x500 [ 31.068299] [] ? fanout_demux_rollover+0x4bc/0x4d0 [ 31.074847] [] __asan_report_load4_noabort+0x29/0x30 [ 31.081568] [] fanout_demux_rollover+0x4bc/0x4d0 [ 31.087942] [] packet_rcv_fanout+0x3e6/0x620 [ 31.093976] [] __netif_receive_skb_core+0x887/0x29e0 [ 31.100702] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 31.107691] [] ? netif_wake_subqueue+0x210/0x210 [ 31.114065] [] ? netif_receive_skb_internal+0x92/0x390 [ 31.120957] [] __netif_receive_skb+0x5b/0x1c0 [ 31.127066] [] netif_receive_skb_internal+0xff/0x390 [ 31.133814] [] ? netif_receive_skb_internal+0x92/0x390 [ 31.140713] [] ? dev_cpu_callback+0x680/0x680 [ 31.146832] [] ? dev_gro_receive+0x1d6/0x16f0 [ 31.152943] [] ? dev_gro_receive+0x67a/0x16f0 [ 31.159060] [] ? eth_type_trans+0x2a8/0x5d0 [ 31.164998] [] napi_gro_receive+0x1fb/0x400 [ 31.171110] [] virtnet_receive+0xe1c/0x1cf0 [ 31.177045] [] ? virtnet_open+0x250/0x250 [ 31.182813] [] ? check_preemption_disabled+0x3b/0x200 [ 31.189630] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 31.196609] [] ? check_preemption_disabled+0x3b/0x200 [ 31.203414] [] ? debug_smp_processor_id+0x1c/0x20 [ 31.209871] [] virtnet_poll+0x26/0x140 [ 31.215376] [] net_rx_action+0x396/0xe00 [ 31.221053] [] ? sk_busy_loop+0xca0/0xca0 [ 31.226835] [] ? handle_edge_irq+0x417/0x8e0 [ 31.232860] [] ? _raw_spin_lock+0x3e/0x50 [ 31.238624] [] ? check_preemption_disabled+0x3b/0x200 [ 31.245431] [] __do_softirq+0x22d/0x964 [ 31.251022] [] irq_exit+0x165/0x190 [ 31.256265] [] do_IRQ+0x107/0x1b0 [ 31.261334] [] common_interrupt+0x8c/0x8c [ 31.267097] [ 31.269126] [] ? native_safe_halt+0x6/0x10 [ 31.274991] [] ? trace_hardirqs_on+0xd/0x10 [ 31.280927] [] default_idle+0x55/0x360 [ 31.287518] [] arch_cpu_idle+0xa/0x10 [ 31.292945] [] default_idle_call+0x36/0x60 [ 31.298810] [] cpu_startup_entry+0x30c/0x3d0 [ 31.304841] [] ? cpu_in_idle+0x20/0x20 [ 31.310348] [] rest_init+0x184/0x190 [ 31.315683] [] start_kernel+0x679/0x6ae [ 31.321284] [] ? thread_stack_cache_init+0xb/0xb [ 31.327655] [] ? early_idt_handler_array+0x120/0x120 [ 31.334374] [] x86_64_start_reservations+0x2a/0x2c [ 31.340917] [] x86_64_start_kernel+0x140/0x163 [ 31.347116] Object at ffff8801d13b1a80, in cache kmalloc-128 size: 128 [ 31.353755] Allocated: [ 31.356217] PID = 3417 [ 31.358685] save_stack_trace+0x16/0x20 [ 31.362626] save_stack+0x43/0xd0 [ 31.366045] kasan_kmalloc+0xad/0xe0 [ 31.369723] kmem_cache_alloc_trace+0xfb/0x2a0 [ 31.374272] packet_setsockopt+0x181c/0x2240 [ 31.378647] SyS_setsockopt+0x160/0x250 [ 31.382589] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 31.387304] Freed: [ 31.389431] PID = 0 [ 31.391634] save_stack_trace+0x16/0x20 [ 31.395573] save_stack+0x43/0xd0 [ 31.398988] kasan_slab_free+0x73/0xc0 [ 31.402841] kfree+0xf0/0x2f0 [ 31.405912] rcu_process_callbacks+0x981/0x12d0 [ 31.410546] __do_softirq+0x22d/0x964 [ 31.414322] Memory state around the buggy address: [ 31.419219] ffff8801d13b1980: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 31.426545] ffff8801d13b1a00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc