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-net-kasan-gce-9,10.128.0.5' (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 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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 137.180476] dev_remove_pack: ffff8801c55ac840 not found executing program executing program executing program [ 137.317379] ================================================================== [ 137.324853] BUG: KASAN: use-after-free in __netif_receive_skb_core+0x2be3/0x33d0 [ 137.332375] Read of size 2 at addr ffff8801c6c27680 by task syzkaller045818/28464 [ 137.339972] [ 137.341585] CPU: 0 PID: 28464 Comm: syzkaller045818 Not tainted 4.13.0-rc7+ #35 [ 137.349011] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 137.358351] Call Trace: [ 137.360904] [ 137.363036] dump_stack+0x194/0x257 [ 137.366639] ? arch_local_irq_restore+0x53/0x53 [ 137.371287] ? show_regs_print_info+0x65/0x65 [ 137.375770] ? __netif_receive_skb_core+0x2be3/0x33d0 [ 137.380948] print_address_description+0x73/0x250 [ 137.385771] ? __netif_receive_skb_core+0x2be3/0x33d0 [ 137.390932] kasan_report+0x24e/0x340 [ 137.394707] __asan_report_load2_noabort+0x14/0x20 [ 137.399607] __netif_receive_skb_core+0x2be3/0x33d0 [ 137.404604] ? nf_ingress+0x9f0/0x9f0 [ 137.408378] ? update_stack_state+0x700/0x700 [ 137.412862] ? __hrtimer_run_queues+0x385/0xe10 [ 137.417513] ? is_bpf_text_address+0xa4/0x120 [ 137.421983] ? __kernel_text_address+0xae/0xe0 [ 137.426537] ? unwind_get_return_address+0x61/0xa0 [ 137.431439] ? __save_stack_trace+0x7e/0xd0 [ 137.435751] ? print_usage_bug+0x480/0x480 [ 137.439986] ? save_stack+0xa3/0xd0 [ 137.443600] ? save_stack_trace+0x16/0x20 [ 137.447717] ? save_stack+0x43/0xd0 [ 137.451311] ? kasan_kmalloc+0xad/0xe0 [ 137.455166] ? kasan_slab_alloc+0x12/0x20 [ 137.459283] ? kmem_cache_alloc+0x127/0x750 [ 137.463595] ? __build_skb+0x9d/0x450 [ 137.467371] ? __napi_alloc_skb+0x173/0x290 [ 137.471687] ? page_to_skb.isra.40+0xe6/0x800 [ 137.476149] ? receive_buf+0x2db4/0x51f0 [ 137.480195] ? find_held_lock+0x35/0x1d0 [ 137.484247] ? lock_downgrade+0x990/0x990 [ 137.488375] ? pvclock_read_flags+0x160/0x160 [ 137.492840] ? mark_held_locks+0xaf/0x100 [ 137.496962] ? lock_acquire+0x1d5/0x580 [ 137.500906] ? lock_acquire+0x1d5/0x580 [ 137.504852] ? netif_receive_skb_internal+0x93/0x5e0 [ 137.509934] ? ktime_get_with_offset+0x2c1/0x420 [ 137.514674] ? lock_release+0xa40/0xa40 [ 137.518620] ? do_gettimeofday+0x190/0x190 [ 137.522834] __netif_receive_skb+0x2c/0x1b0 [ 137.527133] ? __netif_receive_skb+0x2c/0x1b0 [ 137.531602] netif_receive_skb_internal+0x10b/0x5e0 [ 137.536590] ? dev_cpu_dead+0xb00/0xb00 [ 137.540541] ? __alloc_pages_nodemask+0xd40/0xd40 [ 137.545370] ? net_rx_action+0x1910/0x1910 [ 137.549587] ? __lock_is_held+0xb6/0x140 [ 137.553627] ? skb_gro_reset_offset+0x17b/0x300 [ 137.558281] napi_gro_receive+0x3d0/0x500 [ 137.562417] ? dev_gro_receive+0x19b0/0x19b0 [ 137.566801] ? eth_type_trans+0x2a3/0x650 [ 137.570922] ? eth_gro_receive+0x810/0x810 [ 137.575139] receive_buf+0xcc5/0x51f0 [ 137.578911] ? check_noncircular+0x20/0x20 [ 137.583138] ? virtnet_set_rx_mode+0x9f0/0x9f0 [ 137.587690] ? lockdep_init_map+0x110/0x650 [ 137.591990] ? print_usage_bug+0x480/0x480 [ 137.596210] ? account_entity_enqueue+0x27d/0x4e0 [ 137.601062] ? __enqueue_entity+0x134/0x230 [ 137.605360] ? __update_load_avg_se.isra.23+0x39c/0x590 [ 137.610736] ? enqueue_task_fair+0x2541/0x7a10 [ 137.615319] ? dequeue_task_fair+0x5c10/0x5c10 [ 137.619879] ? __lock_acquire+0x6ef/0x3dc0 [ 137.624092] ? print_usage_bug+0x480/0x480 [ 137.628300] ? __lock_acquire+0x6ef/0x3dc0 [ 137.632514] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 137.637681] ? _find_next_bit+0xee/0x120 [ 137.641750] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 137.646940] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 137.652113] ? check_noncircular+0x20/0x20 [ 137.656322] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 137.661490] ? find_held_lock+0x35/0x1d0 [ 137.665529] ? print_usage_bug+0x480/0x480 [ 137.669738] ? select_task_rq_fair+0xeba/0x2ac0 [ 137.674383] ? __lock_is_held+0xb6/0x140 [ 137.678429] ? print_usage_bug+0x480/0x480 [ 137.682637] ? check_noncircular+0x20/0x20 [ 137.686845] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 137.692012] ? select_task_rq_fair+0xed9/0x2ac0 [ 137.696662] ? print_usage_bug+0x480/0x480 [ 137.700877] ? find_held_lock+0x35/0x1d0 [ 137.704924] ? print_usage_bug+0x480/0x480 [ 137.709143] ? __lock_acquire+0x6ef/0x3dc0 [ 137.713356] ? lock_downgrade+0x990/0x990 [ 137.717481] ? __lock_acquire+0x6ef/0x3dc0 [ 137.721708] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 137.726877] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 137.732054] ? check_noncircular+0x20/0x20 [ 137.736276] ? hrtimer_forward+0x2d0/0x2d0 [ 137.740484] ? vring_use_dma_api+0x7f/0xa0 [ 137.744689] ? vring_unmap_one+0x49/0x3d0 [ 137.748808] ? detach_buf+0x463/0x6a0 [ 137.752584] ? print_usage_bug+0x480/0x480 [ 137.756797] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 137.761964] ? virtqueue_get_buf_ctx+0x3b1/0x8b0 [ 137.766695] ? detach_buf+0x6a0/0x6a0 [ 137.770516] virtnet_poll+0x304/0xad0 [ 137.774285] ? print_usage_bug+0x480/0x480 [ 137.778495] ? receive_buf+0x51f0/0x51f0 [ 137.782530] ? mark_held_locks+0xaf/0x100 [ 137.786700] ? net_rx_action+0x49b/0x1910 [ 137.790832] net_rx_action+0x792/0x1910 [ 137.794789] ? napi_complete_done+0x6c0/0x6c0 [ 137.799271] ? mark_held_locks+0xaf/0x100 [ 137.803415] ? __run_timers+0x947/0xb90 [ 137.807382] ? __note_gp_changes+0x8d0/0x8d0 [ 137.811766] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 137.816929] ? __lock_is_held+0xb6/0x140 [ 137.820974] ? rcu_read_lock_sched_held+0x108/0x120 [ 137.825978] ? __raise_softirq_irqoff+0x21c/0x2c0 [ 137.830791] ? raise_softirq+0x490/0x490 [ 137.834827] ? print_usage_bug+0x480/0x480 [ 137.839038] ? note_gp_changes+0x650/0x650 [ 137.843250] ? print_usage_bug+0x480/0x480 [ 137.847463] ? timerqueue_add+0x1e9/0x280 [ 137.851590] ? trace_hardirqs_off+0xd/0x10 [ 137.855798] ? __napi_schedule+0x25e/0x370 [ 137.860010] ? netdev_info+0x170/0x170 [ 137.863882] ? check_noncircular+0x20/0x20 [ 137.868097] ? __lock_is_held+0xb6/0x140 [ 137.872135] ? check_noncircular+0x20/0x20 [ 137.876351] ? rcu_read_lock_sched_held+0x108/0x120 [ 137.881348] ? __handle_irq_event_percpu+0x308/0x9d0 [ 137.886439] ? __lock_is_held+0xb6/0x140 [ 137.890496] __do_softirq+0x2f5/0xba3 [ 137.894274] ? handle_edge_irq+0x2b4/0x7c0 [ 137.898494] ? __softirqentry_text_start+0x8/0x8 [ 137.903229] ? do_raw_spin_trylock+0x190/0x190 [ 137.907781] ? handle_irq_event_percpu+0x141/0x1b0 [ 137.912682] ? native_apic_msr_write+0x30/0x80 [ 137.917243] ? __handle_irq_event_percpu+0x9d0/0x9d0 [ 137.922326] ? lapic_next_event+0x5a/0x90 [ 137.926451] ? _raw_spin_lock+0x32/0x40 [ 137.930407] ? _raw_spin_unlock+0x22/0x30 [ 137.934536] ? handle_edge_irq+0x2b4/0x7c0 [ 137.938753] irq_exit+0x1cc/0x200 [ 137.942178] do_IRQ+0xf6/0x190 [ 137.945344] common_interrupt+0x93/0x93 [ 137.949298] RIP: 0010:__handle_mm_fault+0x5ad/0x3860 [ 137.954379] RSP: 0000:ffff8801d33ffbe8 EFLAGS: 00000207 ORIG_RAX: ffffffffffffff6e [ 137.962074] RAX: 0000000000000000 RBX: ffff8801d529de08 RCX: 0000000000000000 [ 137.969320] RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffffed003a67ffb8 [ 137.976560] RBP: ffff8801d33ffe08 R08: 0000000000000001 R09: 1ffff1003a67ff5b [ 137.983798] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8801c6563000 [ 137.991040] R13: 1ffff1003a67ff88 R14: ffff8801d33ffd40 R15: ffff8801d33ffde0 [ 137.998320] [ 138.000552] ? __handle_mm_fault+0x577/0x3860 [ 138.005050] ? __pmd_alloc+0x4e0/0x4e0 [ 138.008937] ? find_held_lock+0x35/0x1d0 [ 138.012994] ? handle_mm_fault+0x23e/0x860 [ 138.017219] ? lock_downgrade+0x990/0x990 [ 138.021361] handle_mm_fault+0x3bb/0x860 [ 138.025398] ? down_read_trylock+0xdb/0x170 [ 138.029700] ? __handle_mm_fault+0x3860/0x3860 [ 138.034253] ? vmacache_find+0x61/0x270 [ 138.038198] ? vmacache_update+0xfe/0x130 [ 138.042318] ? find_vma+0x30/0x150 [ 138.045841] __do_page_fault+0x4f6/0xb60 [ 138.049902] do_page_fault+0x54/0x70 [ 138.053600] page_fault+0x28/0x30 [ 138.057025] RIP: 0033:0x4490cd [ 138.060195] RSP: 002b:00007ffdabbffd48 EFLAGS: 00010202 [ 138.065526] RAX: ffffffffffffffea RBX: 00007fbc335c2700 RCX: 00007fbc335c2700 [ 138.072765] RDX: 00000000003d0f00 RSI: 00007fbc335c1e70 RDI: 00000000004028e0 [ 138.080005] RBP: 00007ffdabbffe00 R08: 00007fbc335c29d0 R09: 00007fbc335c2700 [ 138.087281] R10: 00007fbc335c1e80 R11: 0000000000000246 R12: 0000000000000000 [ 138.094518] R13: 00007ffdabbffdff R14: 00007fbc335c29c0 R15: 0000000000000000 [ 138.101771] [ 138.103378] Allocated by task 28325: [ 138.107073] save_stack_trace+0x16/0x20 [ 138.111021] save_stack+0x43/0xd0 [ 138.114452] kasan_kmalloc+0xad/0xe0 [ 138.118153] kmem_cache_alloc_trace+0x12f/0x740 [ 138.122793] fanout_add+0xa50/0x1190 [ 138.126484] packet_setsockopt+0xfdc/0x1e80 [ 138.130788] SyS_setsockopt+0x189/0x360 [ 138.134736] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 138.139485] [ 138.141085] Freed by task 28424: [ 138.144427] save_stack_trace+0x16/0x20 [ 138.148370] save_stack+0x43/0xd0 [ 138.151792] kasan_slab_free+0x71/0xc0 [ 138.155652] kfree+0xca/0x250 [ 138.158736] packet_release+0xa8f/0xd70 [ 138.162679] sock_release+0x8d/0x1e0 [ 138.166361] sock_close+0x16/0x20 [ 138.169789] __fput+0x327/0x7e0 [ 138.173038] ____fput+0x15/0x20 [ 138.176289] task_work_run+0x18a/0x260 [ 138.180149] do_exit+0xa3a/0x1b10 [ 138.183575] do_group_exit+0x149/0x400 [ 138.187430] SyS_exit_group+0x1d/0x20 [ 138.191199] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 138.195920] [ 138.197517] The buggy address belongs to the object at ffff8801c6c26e00 [ 138.197517] which belongs to the cache kmalloc-4096 of size 4096 [ 138.210313] The buggy address is located 2176 bytes inside of [ 138.210313] 4096-byte region [ffff8801c6c26e00, ffff8801c6c27e00) [ 138.222328] The buggy address belongs to the page: [ 138.227226] page:ffffea00071b0980 count:1 mapcount:0 mapping:ffff8801c6c26e00 index:0x0 compound_mapcount: 0 [ 138.237164] flags: 0x200000000008100(slab|head) [ 138.241812] raw: 0200000000008100 ffff8801c6c26e00 0000000000000000 0000000100000001 [ 138.249672] raw: ffffea00071cb220 ffffea00071b76a0 ffff8801dac00dc0 0000000000000000 [ 138.257522] page dumped because: kasan: bad access detected [ 138.263204] [ 138.264799] Memory state around the buggy address: [ 138.269696] ffff8801c6c27580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 138.277027] ffff8801c6c27600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 138.284357] >ffff8801c6c27680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 138.291683] ^ [ 138.295036] ffff8801c6c27700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 138.302380] ffff8801c6c27780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 138.309706] ==================================================================