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-next-kasan-gce-4,10.128.15.197' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 45.252565] dev_remove_pack: ffff8801cced9140 not found [ 45.293132] ================================================================== [ 45.300537] BUG: KASAN: use-after-free in __netif_receive_skb_core+0x2be3/0x33d0 [ 45.308063] Read of size 2 at addr ffff8801c9610980 by task syzkaller621851/3000 [ 45.315583] [ 45.317229] CPU: 0 PID: 3000 Comm: syzkaller621851 Not tainted 4.13.0-next-20170907+ #17 [ 45.325443] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.334784] Call Trace: [ 45.337356] [ 45.339508] dump_stack+0x194/0x257 [ 45.343138] ? arch_local_irq_restore+0x53/0x53 [ 45.347786] ? show_regs_print_info+0x65/0x65 [ 45.352270] ? __netif_receive_skb_core+0x2be3/0x33d0 [ 45.357440] print_address_description+0x73/0x250 [ 45.362263] ? __netif_receive_skb_core+0x2be3/0x33d0 [ 45.367438] kasan_report+0x24e/0x340 [ 45.371223] __asan_report_load2_noabort+0x14/0x20 [ 45.376128] __netif_receive_skb_core+0x2be3/0x33d0 [ 45.381119] ? __bpf_address_lookup+0x2b0/0x2b0 [ 45.385791] ? nf_ingress+0x9f0/0x9f0 [ 45.389574] ? unwind_dump+0x4c0/0x4c0 [ 45.393452] ? check_noncircular+0x20/0x20 [ 45.397661] ? __kernel_text_address+0xae/0xe0 [ 45.402215] ? unwind_get_return_address+0x61/0xa0 [ 45.407118] ? __save_stack_trace+0x7e/0xd0 [ 45.411421] ? depot_save_stack+0x12c/0x490 [ 45.415729] ? find_held_lock+0x39/0x1d0 [ 45.419792] ? lock_downgrade+0x990/0x990 [ 45.423917] ? schedule+0x108/0x440 [ 45.427524] ? lock_acquire+0x1d5/0x580 [ 45.431480] ? netif_receive_skb_internal+0x1d7/0x5e0 [ 45.436646] ? find_held_lock+0x39/0x1d0 [ 45.440693] ? pvclock_read_flags+0x160/0x160 [ 45.445159] ? lock_downgrade+0x990/0x990 [ 45.449290] ? lock_acquire+0x1d5/0x580 [ 45.453238] ? netif_receive_skb_internal+0x93/0x5e0 [ 45.458313] ? ktime_get_with_offset+0x2c1/0x420 [ 45.463054] ? lock_release+0xd70/0xd70 [ 45.467003] ? ktime_get+0x3a0/0x3a0 [ 45.470713] __netif_receive_skb+0x2c/0x1b0 [ 45.475015] ? __netif_receive_skb+0x2c/0x1b0 [ 45.479501] netif_receive_skb_internal+0x10b/0x5e0 [ 45.484493] ? dev_cpu_dead+0xb00/0xb00 [ 45.488439] ? __alloc_pages_nodemask+0xd80/0xd80 [ 45.493257] ? net_rx_action+0x1910/0x1910 [ 45.497469] ? rcu_pm_notify+0xc0/0xc0 [ 45.501337] ? skb_gro_reset_offset+0x17b/0x300 [ 45.505986] napi_gro_receive+0x3d0/0x500 [ 45.510116] ? dev_gro_receive+0x19b0/0x19b0 [ 45.514501] ? eth_type_trans+0x2a3/0x650 [ 45.518630] ? eth_gro_receive+0x810/0x810 [ 45.522850] receive_buf+0xcc5/0x51f0 [ 45.526637] ? virtnet_set_rx_mode+0x9f0/0x9f0 [ 45.531196] ? print_usage_bug+0x480/0x480 [ 45.535407] ? __lock_acquire+0x732/0x4620 [ 45.539629] ? print_usage_bug+0x480/0x480 [ 45.543841] ? check_noncircular+0x20/0x20 [ 45.548079] ? print_usage_bug+0x480/0x480 [ 45.552296] ? __lock_acquire+0x732/0x4620 [ 45.556530] ? find_held_lock+0x39/0x1d0 [ 45.560570] ? __lock_acquire+0x732/0x4620 [ 45.564780] ? lock_downgrade+0x990/0x990 [ 45.568913] ? check_noncircular+0x20/0x20 [ 45.573133] ? check_noncircular+0x20/0x20 [ 45.577349] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 45.582525] ? __read_once_size_nocheck.constprop.8+0x10/0x10 [ 45.588382] ? hrtimer_interrupt+0x1d4/0x5f0 [ 45.592763] ? hrtimer_interrupt+0x1d4/0x5f0 [ 45.597146] ? trace_hardirqs_on_caller+0x19e/0x5c0 [ 45.602154] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 45.607146] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 45.612149] ? unwind_dump+0x4c0/0x4c0 [ 45.616029] ? unwind_dump+0x4c0/0x4c0 [ 45.619906] ? __unwind_start+0x169/0x330 [ 45.624038] ? unwind_get_return_address+0x61/0xa0 [ 45.628946] ? __save_stack_trace+0x61/0xd0 [ 45.633246] ? get_stack_info+0x37/0x150 [ 45.637293] ? update_stack_state+0x225/0x700 [ 45.641783] ? __read_once_size_nocheck.constprop.8+0x10/0x10 [ 45.647650] ? lock_release+0x69b/0xd70 [ 45.651602] ? find_held_lock+0x39/0x1d0 [ 45.655641] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 45.660644] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 45.665645] ? unwind_dump+0x4c0/0x4c0 [ 45.669510] ? unwind_dump+0x4c0/0x4c0 [ 45.673375] ? pvclock_read_flags+0x160/0x160 [ 45.677846] ? __unwind_start+0x169/0x330 [ 45.681967] ? print_usage_bug+0x480/0x480 [ 45.686174] ? unwind_get_return_address+0x61/0xa0 [ 45.691085] ? __save_stack_trace+0x61/0xd0 [ 45.695392] ? lock_release+0x69b/0xd70 [ 45.699359] ? save_stack_trace+0x16/0x20 [ 45.703501] ? __lock_acquire+0x20fd/0x4620 [ 45.707805] ? vring_use_dma_api+0x7f/0xa0 [ 45.712026] ? vring_unmap_one+0x49/0x3d0 [ 45.716170] ? detach_buf+0x463/0x6a0 [ 45.719958] ? virtqueue_get_buf_ctx+0x3b1/0x8b0 [ 45.724690] ? common_interrupt+0x9d/0x9d [ 45.728829] ? detach_buf+0x6a0/0x6a0 [ 45.732614] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 45.737616] virtnet_poll+0x304/0xad0 [ 45.741408] ? receive_buf+0x51f0/0x51f0 [ 45.745444] ? unwind_dump+0x4c0/0x4c0 [ 45.749312] ? net_rx_action+0x49b/0x1910 [ 45.753445] net_rx_action+0x792/0x1910 [ 45.757406] ? napi_complete_done+0x6c0/0x6c0 [ 45.761885] ? save_stack_trace+0x16/0x20 [ 45.766008] ? __lock_acquire+0x20fd/0x4620 [ 45.770327] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 45.775493] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 45.780665] ? check_noncircular+0x20/0x20 [ 45.784884] ? check_noncircular+0x20/0x20 [ 45.789098] ? rcu_pm_notify+0xc0/0xc0 [ 45.792980] ? rcu_read_lock_sched_held+0x108/0x120 [ 45.797971] ? __raise_softirq_irqoff+0x21c/0x2c0 [ 45.802792] ? raise_softirq+0x490/0x490 [ 45.806840] ? lock_downgrade+0x990/0x990 [ 45.810986] ? lock_acquire+0x1d5/0x580 [ 45.814947] ? clockevents_program_event+0x163/0x2e0 [ 45.820042] ? trace_hardirqs_off+0xd/0x10 [ 45.824254] ? __napi_schedule+0x25e/0x370 [ 45.828471] ? netdev_info+0x170/0x170 [ 45.832331] ? check_noncircular+0x20/0x20 [ 45.836540] ? check_noncircular+0x20/0x20 [ 45.840752] ? rcu_pm_notify+0xc0/0xc0 [ 45.844642] ? rcu_read_lock_sched_held+0x108/0x120 [ 45.849640] ? __handle_irq_event_percpu+0x308/0x9d0 [ 45.854720] ? rcu_pm_notify+0xc0/0xc0 [ 45.858596] __do_softirq+0x2bb/0xbd0 [ 45.862382] ? __softirqentry_text_start+0x8/0x8 [ 45.867110] ? do_raw_spin_trylock+0x190/0x190 [ 45.871661] ? handle_irq_event_percpu+0x141/0x1b0 [ 45.876574] ? __handle_irq_event_percpu+0x9d0/0x9d0 [ 45.881663] ? _raw_spin_lock+0x32/0x40 [ 45.885620] ? _raw_spin_unlock+0x22/0x30 [ 45.889743] ? handle_edge_irq+0x2b4/0x7c0 [ 45.893963] irq_exit+0x1d3/0x210 [ 45.897391] do_IRQ+0xf6/0x190 [ 45.900559] common_interrupt+0x9d/0x9d [ 45.904501] [ 45.906711] RIP: 0010:_raw_spin_unlock_irq+0x56/0x70 [ 45.911783] RSP: 0018:ffff8801ce6c77f0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff6e [ 45.919466] RAX: dffffc0000000000 RBX: ffff8801db225c00 RCX: 0000000000000000 [ 45.926710] RDX: 1ffffffff0b59307 RSI: 0000000000000001 RDI: ffffffff85ac9838 [ 45.933953] RBP: ffff8801ce6c77f8 R08: ffff8801ce6c7178 R09: 0000000000000000 [ 45.941194] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801ce454100 [ 45.948446] R13: 1ffff10039cd8f07 R14: ffff8801ce45e140 R15: ffff8801ce45e140 [ 45.955720] finish_task_switch+0x1d3/0x740 [ 45.960021] ? finish_task_switch+0x1aa/0x740 [ 45.964499] ? preempt_notifier_dec+0x20/0x20 [ 45.968977] __schedule+0x8f0/0x2070 [ 45.972683] ? __sched_text_start+0x8/0x8 [ 45.976804] ? timerqueue_add+0x1e9/0x280 [ 45.980939] ? do_raw_spin_trylock+0x190/0x190 [ 45.985498] ? __remove_hrtimer+0x190/0x190 [ 45.989798] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 45.994884] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 45.999876] ? trace_hardirqs_on+0xd/0x10 [ 46.004005] schedule+0x108/0x440 [ 46.007439] ? __schedule+0x2070/0x2070 [ 46.011403] ? do_wait+0x50a/0xa90 [ 46.014932] do_nanosleep+0x215/0x6f0 [ 46.018711] ? schedule_timeout_idle+0x90/0x90 [ 46.023265] ? lock_downgrade+0x990/0x990 [ 46.027393] ? rcu_pm_notify+0xc0/0xc0 [ 46.031260] ? memset+0x31/0x40 [ 46.034522] hrtimer_nanosleep+0x2b2/0x860 [ 46.039368] ? SyS_waitid+0x50/0x50 [ 46.042970] ? nanosleep_copyout+0x100/0x100 [ 46.047351] ? __might_sleep+0x95/0x190 [ 46.051306] ? kasan_check_write+0x14/0x20 [ 46.055512] ? _copy_from_user+0x99/0x110 [ 46.059639] ? __hrtimer_init+0x140/0x140 [ 46.063770] SyS_nanosleep+0x175/0x1f0 [ 46.067634] ? hrtimer_nanosleep+0x860/0x860 [ 46.072020] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 46.077024] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 46.081766] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 46.086494] RIP: 0033:0x445590 [ 46.089656] RSP: 002b:00007ffe8e54da68 EFLAGS: 00000246 ORIG_RAX: 0000000000000023 [ 46.097337] RAX: ffffffffffffffda RBX: 0000000000001e67 RCX: 0000000000445590 [ 46.104580] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffe8e54da70 [ 46.111820] RBP: 0000000000000082 R08: 0000000000000bb8 R09: 00000000015ca940 [ 46.119061] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000001e67 [ 46.126307] R13: 0000000000408100 R14: 0000000000000000 R15: 0000000000000000 [ 46.133573] [ 46.135176] Allocated by task 7798: [ 46.138775] save_stack_trace+0x16/0x20 [ 46.142719] save_stack+0x43/0xd0 [ 46.146145] kasan_kmalloc+0xad/0xe0 [ 46.149828] kmem_cache_alloc_trace+0x136/0x750 [ 46.154485] fanout_add+0xa50/0x1190 [ 46.158174] packet_setsockopt+0xfdc/0x1e80 [ 46.162476] SyS_setsockopt+0x189/0x360 [ 46.166437] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 46.171162] [ 46.172761] Freed by task 7714: [ 46.176020] save_stack_trace+0x16/0x20 [ 46.179981] save_stack+0x43/0xd0 [ 46.183411] kasan_slab_free+0x71/0xc0 [ 46.187270] kfree+0xca/0x250 [ 46.190346] packet_release+0xa8f/0xd70 [ 46.194290] sock_release+0x8d/0x1e0 [ 46.197973] sock_close+0x16/0x20 [ 46.201397] __fput+0x333/0x7f0 [ 46.204652] ____fput+0x15/0x20 [ 46.207901] task_work_run+0x199/0x270 [ 46.211760] do_exit+0xa52/0x1b40 [ 46.215183] do_group_exit+0x149/0x400 [ 46.219044] SyS_exit_group+0x1d/0x20 [ 46.222815] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 46.227543] [ 46.229151] The buggy address belongs to the object at ffff8801c9610100 [ 46.229151] which belongs to the cache kmalloc-4096 of size 4096 [ 46.241953] The buggy address is located 2176 bytes inside of [ 46.241953] 4096-byte region [ffff8801c9610100, ffff8801c9611100) [ 46.253974] The buggy address belongs to the page: [ 46.258877] page:ffffea0007258400 count:1 mapcount:0 mapping:ffff8801c9610100 index:0x0 compound_mapcount: 0 [ 46.268824] flags: 0x200000000008100(slab|head) [ 46.273472] raw: 0200000000008100 ffff8801c9610100 0000000000000000 0000000100000001 [ 46.281322] raw: ffffea00072c7da0 ffffea000725df20 ffff8801dac00dc0 0000000000000000 [ 46.289172] page dumped because: kasan: bad access detected [ 46.294850]