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-0,10.128.15.210' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 47.229766] dev_remove_pack: ffff8801c27dbf00 not found executing program [ 47.293303] ================================================================== [ 47.300725] BUG: KASAN: use-after-free in fanout_demux_rollover+0x49b/0x4d0 [ 47.307797] Read of size 8 at addr ffff8801c27dbeb0 by task ksoftirqd/0/7 [ 47.314690] [ 47.316296] CPU: 0 PID: 7 Comm: ksoftirqd/0 Not tainted 4.14.0-rc1-next-20170920+ #26 [ 47.324233] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.333562] Call Trace: [ 47.336124] dump_stack+0x194/0x257 [ 47.339727] ? arch_local_irq_restore+0x53/0x53 [ 47.344369] ? show_regs_print_info+0x65/0x65 [ 47.348842] ? fanout_demux_rollover+0x49b/0x4d0 [ 47.353571] print_address_description+0x73/0x250 [ 47.358383] ? fanout_demux_rollover+0x49b/0x4d0 [ 47.363108] kasan_report+0x24e/0x340 [ 47.366884] __asan_report_load8_noabort+0x14/0x20 [ 47.371785] fanout_demux_rollover+0x49b/0x4d0 [ 47.376340] ? skb_split+0x1310/0x1310 [ 47.380207] packet_rcv_fanout+0x52e/0x7d0 [ 47.384417] ? compat_packet_setsockopt+0x140/0x140 [ 47.389409] ? refcount_add+0x60/0x60 [ 47.393182] ? packet_rcv_fanout+0x7d0/0x7d0 [ 47.397574] __netif_receive_skb_core+0xc12/0x33d0 [ 47.402476] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 47.407473] ? nf_ingress+0x9f0/0x9f0 [ 47.411245] ? unwind_dump+0x4c0/0x4c0 [ 47.415107] ? check_noncircular+0x20/0x20 [ 47.419326] ? check_noncircular+0x20/0x20 [ 47.423540] ? __save_stack_trace+0x6e/0xd0 [ 47.427841] ? depot_save_stack+0x12c/0x490 [ 47.432144] ? find_held_lock+0x39/0x1d0 [ 47.436188] ? lock_downgrade+0x990/0x990 [ 47.440313] ? lock_acquire+0x1d5/0x580 [ 47.444259] ? netif_receive_skb_internal+0x1d7/0x670 [ 47.449420] ? find_held_lock+0x39/0x1d0 [ 47.453465] ? pvclock_read_flags+0x160/0x160 [ 47.457949] ? lock_downgrade+0x990/0x990 [ 47.462079] ? lock_acquire+0x1d5/0x580 [ 47.466026] ? netif_receive_skb_internal+0xa2/0x670 [ 47.471106] ? ktime_get_with_offset+0x2c1/0x420 [ 47.475839] ? lock_release+0xd70/0xd70 [ 47.479784] ? ktime_get+0x3a0/0x3a0 [ 47.483483] __netif_receive_skb+0x2c/0x1b0 [ 47.487776] ? __netif_receive_skb+0x2c/0x1b0 [ 47.492245] netif_receive_skb_internal+0x10b/0x670 [ 47.497234] ? dev_cpu_dead+0xb00/0xb00 [ 47.501182] ? __alloc_pages_nodemask+0xd80/0xd80 [ 47.506002] ? net_rx_action+0x1910/0x1910 [ 47.510215] ? rcu_pm_notify+0xc0/0xc0 [ 47.514083] ? skb_gro_reset_offset+0x17b/0x300 [ 47.518727] napi_gro_receive+0x3d0/0x500 [ 47.522849] ? dev_gro_receive+0x19b0/0x19b0 [ 47.527228] ? eth_type_trans+0x2a3/0x650 [ 47.531351] ? eth_gro_receive+0x810/0x810 [ 47.535572] receive_buf+0xcc5/0x51f0 [ 47.539347] ? __unwind_start+0x169/0x330 [ 47.543481] ? virtnet_set_rx_mode+0x9f0/0x9f0 [ 47.548040] ? __lock_acquire+0x732/0x4620 [ 47.552247] ? save_stack_trace+0x16/0x20 [ 47.556367] ? __lock_acquire+0x20fd/0x4620 [ 47.560666] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 47.565657] ? check_noncircular+0x20/0x20 [ 47.569868] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 47.575041] ? __read_once_size_nocheck.constprop.8+0x10/0x10 [ 47.580899] ? find_held_lock+0x39/0x1d0 [ 47.584945] ? lock_downgrade+0x990/0x990 [ 47.589062] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 47.594058] ? cpuacct_charge+0xc4/0x5b0 [ 47.598098] ? lock_release+0xd70/0xd70 [ 47.602050] ? rb_erase_cached+0xf50/0x3540 [ 47.606351] ? rb_next+0x140/0x140 [ 47.609867] ? cpuacct_charge+0x2fd/0x5b0 [ 47.613991] ? cpuusage_read+0x10/0x10 [ 47.617854] ? check_noncircular+0x20/0x20 [ 47.622067] ? update_curr+0x30c/0x800 [ 47.625925] ? find_held_lock+0x39/0x1d0 [ 47.629959] ? account_entity_dequeue+0x234/0x590 [ 47.634776] ? hrtick_update+0x250/0x250 [ 47.638808] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 47.643971] ? task_fork_fair+0x7b0/0x7b0 [ 47.648101] ? dequeue_task_fair+0x16d8/0x68b0 [ 47.652658] ? lock_release+0xd70/0xd70 [ 47.656605] ? _find_next_bit+0xee/0x120 [ 47.660641] ? __lock_acquire+0x6e3/0x4620 [ 47.664863] ? __read_once_size_nocheck.constprop.8+0x10/0x10 [ 47.670722] ? ret_from_fork+0x2a/0x40 [ 47.674582] ? __read_once_size_nocheck.constprop.8+0x10/0x10 [ 47.680445] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 47.685439] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 47.690438] ? unwind_dump+0x4c0/0x4c0 [ 47.694297] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 47.699290] ? unwind_dump+0x4c0/0x4c0 [ 47.703160] ? __unwind_start+0x169/0x330 [ 47.707282] ? unwind_get_return_address+0x61/0xa0 [ 47.712184] ? __save_stack_trace+0x61/0xd0 [ 47.716482] ? vring_use_dma_api+0x7f/0xa0 [ 47.720690] ? vring_unmap_one+0x49/0x3d0 [ 47.724813] ? detach_buf+0x463/0x6a0 [ 47.728583] ? save_stack_trace+0x16/0x20 [ 47.732701] ? __lock_acquire+0x20fd/0x4620 [ 47.737001] ? virtqueue_get_buf_ctx+0x3b1/0x8b0 [ 47.741732] ? detach_buf+0x6a0/0x6a0 [ 47.745505] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 47.750664] ? audit_kill_trees+0x430/0x430 [ 47.754969] virtnet_poll+0x304/0xad0 [ 47.758752] ? receive_buf+0x51f0/0x51f0 [ 47.762792] ? rcu_pm_notify+0xc0/0xc0 [ 47.766651] ? __lock_is_held+0xbc/0x140 [ 47.770688] ? net_rx_action+0x49b/0x1910 [ 47.774813] net_rx_action+0x792/0x1910 [ 47.778771] ? napi_complete_done+0x6c0/0x6c0 [ 47.783240] ? check_noncircular+0x20/0x20 [ 47.787455] ? __lock_is_held+0xbc/0x140 [ 47.791505] ? find_held_lock+0x39/0x1d0 [ 47.795550] ? lock_downgrade+0x990/0x990 [ 47.799678] ? lock_acquire+0x1d5/0x580 [ 47.803627] ? finish_task_switch+0x1aa/0x740 [ 47.808098] ? do_raw_spin_trylock+0x190/0x190 [ 47.812651] ? lock_release+0xd70/0xd70 [ 47.816600] ? compat_start_thread+0x80/0x80 [ 47.820981] ? check_noncircular+0x20/0x20 [ 47.825191] ? _raw_spin_unlock_irq+0x27/0x70 [ 47.829659] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 47.834648] ? _raw_spin_unlock_irq+0x27/0x70 [ 47.839115] ? finish_task_switch+0x1d3/0x740 [ 47.843581] ? finish_task_switch+0x1aa/0x740 [ 47.848052] ? preempt_notifier_dec+0x20/0x20 [ 47.852529] ? __schedule+0x8f0/0x2070 [ 47.856397] ? rcu_pm_notify+0xc0/0xc0 [ 47.860273] __do_softirq+0x2bb/0xbd0 [ 47.864055] ? __softirqentry_text_start+0x8/0x8 [ 47.868791] ? schedule+0x108/0x440 [ 47.872390] ? __schedule+0x2070/0x2070 [ 47.876346] ? rcu_note_context_switch+0x710/0x710 [ 47.881248] ? do_wait_intr+0x350/0x3e0 [ 47.885194] ? run_ksoftirqd+0x55/0x100 [ 47.889142] ? takeover_tasklets+0xa40/0xa40 [ 47.893523] run_ksoftirqd+0x50/0x100 [ 47.897295] smpboot_thread_fn+0x489/0x850 [ 47.901505] ? sort_range+0x30/0x30 [ 47.905106] ? __kthread_parkme+0xdf/0x240 [ 47.909312] ? __kthread_parkme+0x173/0x240 [ 47.913611] kthread+0x39c/0x470 [ 47.916946] ? sort_range+0x30/0x30 [ 47.920544] ? kthread_create_on_node+0x100/0x100 [ 47.925364] ret_from_fork+0x2a/0x40 [ 47.929065] [ 47.930665] Allocated by task 9527: [ 47.934264] save_stack_trace+0x16/0x20 [ 47.938212] save_stack+0x43/0xd0 [ 47.941636] kasan_kmalloc+0xad/0xe0 [ 47.945320] __kmalloc+0x162/0x760 [ 47.948832] sk_prot_alloc+0x101/0x2a0 [ 47.952700] sk_alloc+0x89/0x700 [ 47.956037] packet_create+0x169/0xb00 [ 47.959897] __sock_create+0x4d4/0x850 [ 47.963754] SyS_socket+0xeb/0x200 [ 47.967268] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 47.971993] [ 47.973591] Freed by task 9473: [ 47.976844] save_stack_trace+0x16/0x20 [ 47.980788] save_stack+0x43/0xd0 [ 47.984211] kasan_slab_free+0x71/0xc0 [ 47.988067] kfree+0xca/0x250 [ 47.991146] __sk_destruct+0x74a/0x910 [ 47.995005] sk_destruct+0x47/0x80 [ 47.998514] __sk_free+0x57/0x230 [ 48.001937] sk_free+0x2a/0x40 [ 48.005101] packet_release+0x859/0xd70 [ 48.009049] sock_release+0x8d/0x1e0 [ 48.012733] sock_close+0x16/0x20 [ 48.016161] __fput+0x333/0x7f0 [ 48.019411] ____fput+0x15/0x20 [ 48.022661] task_work_run+0x199/0x270 [ 48.026520] do_exit+0xa52/0x1b40 [ 48.029946] do_group_exit+0x149/0x400 [ 48.033803] SyS_exit_group+0x1d/0x20 [ 48.037587] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 48.042312] [ 48.043916] The buggy address belongs to the object at ffff8801c27db740 [ 48.043916] which belongs to the cache kmalloc-2048 of size 2048 [ 48.056718] The buggy address is located 1904 bytes inside of [ 48.056718] 2048-byte region [ffff8801c27db740, ffff8801c27dbf40) [ 48.068736] The buggy address belongs to the page: [ 48.073637] page:ffffea000709f680 count:1 mapcount:0 mapping:ffff8801c27da640 index:0x0 compound_mapcount: 0 [ 48.083581] flags: 0x200000000008100(slab|head) [ 48.088226] raw: 0200000000008100 ffff8801c27da640 0000000000000000 0000000100000003 [ 48.096079] raw: ffffea00070a45a0 ffffea000709ca20 ffff8801dac00c40 0000000000000000 [ 48.103931] page dumped because: kasan: bad access detected [ 48.109609] [ 48.111210] Memory state around the buggy address: [ 48.116118] ffff8801c27dbd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.123454] ffff8801c27dbe00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.130784] >ffff8801c27dbe80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.138115] ^ executing program [ 48.143014] ffff8801c27dbf00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 48.150346] ffff8801c27dbf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 48.157674] ================================================================== [ 48.165002] Disabling lock debugging due to kernel taint [ 48.170488] Kernel panic - not syncing: panic_on_warn set ... [ 48.170488] [ 48.177821] CPU: 0 PID: 7 Comm: ksoftirqd/0 Tainted: G B 4.14.0-rc1-next-20170920+ #26 [ 48.186970] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 executing program [ 48.196293] Call Trace: [ 48.198853] dump_stack+0x194/0x257 [ 48.202450] ? arch_local_irq_restore+0x53/0x53 [ 48.207087] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 48.211813] ? fanout_demux_rollover+0x460/0x4d0 [ 48.216536] panic+0x1e4/0x417 [ 48.219696] ? __warn+0x1d9/0x1d9 [ 48.223122] ? fanout_demux_rollover+0x49b/0x4d0 [ 48.227847] kasan_end_report+0x50/0x50 [ 48.231791] kasan_report+0x137/0x340 [ 48.235561] __asan_report_load8_noabort+0x14/0x20 [ 48.240456] fanout_demux_rollover+0x49b/0x4d0 executing program [ 48.245003] ? skb_split+0x1310/0x1310 [ 48.248860] packet_rcv_fanout+0x52e/0x7d0 [ 48.253063] ? compat_packet_setsockopt+0x140/0x140 [ 48.258047] ? refcount_add+0x60/0x60 [ 48.261812] ? packet_rcv_fanout+0x7d0/0x7d0 [ 48.266202] __netif_receive_skb_core+0xc12/0x33d0 [ 48.271103] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 48.276087] ? nf_ingress+0x9f0/0x9f0 [ 48.279850] ? unwind_dump+0x4c0/0x4c0 [ 48.283702] ? check_noncircular+0x20/0x20 [ 48.287906] ? check_noncircular+0x20/0x20 [ 48.292107] ? __save_stack_trace+0x6e/0xd0