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-mmots-kasan-gce-6,10.128.15.201' (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 syzkaller login: [ 35.011930] dev_remove_pack: ffff8801c52ecc40 not found [ 35.072934] ================================================================== [ 35.080369] BUG: KASAN: use-after-free in __netif_receive_skb_core+0x2be3/0x33d0 [ 35.087893] Read of size 2 at addr ffff8801c5649500 by task syzkaller476907/7838 [ 35.095413] [ 35.097030] CPU: 0 PID: 7838 Comm: syzkaller476907 Not tainted 4.13.0-mm1+ #7 [ 35.104283] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.113610] Call Trace: [ 35.116164] [ 35.118303] dump_stack+0x194/0x257 [ 35.121922] ? arch_local_irq_restore+0x53/0x53 [ 35.126578] ? show_regs_print_info+0x65/0x65 [ 35.131097] ? __netif_receive_skb_core+0x2be3/0x33d0 [ 35.136297] print_address_description+0x73/0x250 [ 35.141126] ? __netif_receive_skb_core+0x2be3/0x33d0 [ 35.146291] kasan_report+0x24e/0x340 [ 35.150071] __asan_report_load2_noabort+0x14/0x20 [ 35.154974] __netif_receive_skb_core+0x2be3/0x33d0 [ 35.159968] ? __bpf_address_lookup+0x2b0/0x2b0 [ 35.164652] ? nf_ingress+0x9f0/0x9f0 [ 35.168434] ? unwind_dump+0x4c0/0x4c0 [ 35.172304] ? check_noncircular+0x20/0x20 [ 35.176525] ? check_noncircular+0x20/0x20 [ 35.180731] ? __kernel_text_address+0xae/0xe0 [ 35.185293] ? __save_stack_trace+0x7e/0xd0 [ 35.189597] ? print_usage_bug+0x480/0x480 [ 35.193807] ? perf_trace_lock+0x860/0x860 [ 35.198040] ? find_held_lock+0x39/0x1d0 [ 35.202090] ? perf_trace_lock_acquire+0xfe/0x900 [ 35.206931] ? perf_trace_lock+0x860/0x860 [ 35.211144] ? lock_acquire+0x1d5/0x580 [ 35.215097] ? netif_receive_skb_internal+0x1d7/0x670 [ 35.220299] ? pvclock_read_flags+0x160/0x160 [ 35.224772] ? mark_held_locks+0xb2/0x100 [ 35.228899] ? lock_acquire+0x1d5/0x580 [ 35.232844] ? netif_receive_skb_internal+0xa2/0x670 [ 35.237930] ? ktime_get_with_offset+0x2c1/0x420 [ 35.242689] ? lock_release+0xd70/0xd70 [ 35.246650] ? ktime_get+0x3a0/0x3a0 [ 35.250369] __netif_receive_skb+0x2c/0x1b0 [ 35.254670] ? __netif_receive_skb+0x2c/0x1b0 [ 35.259158] netif_receive_skb_internal+0x10b/0x670 [ 35.264167] ? dev_cpu_dead+0xb00/0xb00 [ 35.268120] ? __alloc_pages_nodemask+0xd80/0xd80 [ 35.272947] ? net_rx_action+0x1910/0x1910 [ 35.277166] ? __lock_is_held+0xbc/0x140 [ 35.281215] ? skb_gro_reset_offset+0x17b/0x300 [ 35.285872] napi_gro_receive+0x3d0/0x500 [ 35.290005] ? dev_gro_receive+0x19b0/0x19b0 [ 35.294397] ? eth_type_trans+0x2a3/0x650 [ 35.298533] ? eth_gro_receive+0x810/0x810 [ 35.302766] receive_buf+0xcc5/0x51f0 [ 35.306558] ? virtnet_set_rx_mode+0x9f0/0x9f0 [ 35.311121] ? print_usage_bug+0x480/0x480 [ 35.315343] ? __lock_acquire+0x732/0x4620 [ 35.319550] ? unwind_get_return_address+0x61/0xa0 [ 35.324453] ? __save_stack_trace+0x61/0xd0 [ 35.328756] ? rcu_report_qs_rnp+0x613/0x880 [ 35.333147] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 35.338320] ? find_held_lock+0x39/0x1d0 [ 35.342371] ? __lock_acquire+0x732/0x4620 [ 35.346584] ? check_noncircular+0x20/0x20 [ 35.350812] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 35.355987] ? print_usage_bug+0x480/0x480 [ 35.360214] ? print_usage_bug+0x480/0x480 [ 35.364433] ? __read_once_size_nocheck.constprop.8+0x10/0x10 [ 35.370290] ? hrtimer_interrupt+0x1d4/0x5f0 [ 35.374670] ? hrtimer_interrupt+0x1d4/0x5f0 [ 35.379073] ? check_noncircular+0x20/0x20 [ 35.383287] ? __x2apic_send_IPI_dest.constprop.7+0x5b/0x80 [ 35.388976] ? perf_trace_lock_acquire+0xfe/0x900 [ 35.393790] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 35.398791] ? perf_trace_lock+0x860/0x860 [ 35.403028] ? find_held_lock+0x39/0x1d0 [ 35.407092] ? __lock_acquire+0x732/0x4620 [ 35.411308] ? __lock_acquire+0x732/0x4620 [ 35.415521] ? get_stack_info+0x37/0x150 [ 35.419572] ? update_stack_state+0x225/0x700 [ 35.424070] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 35.429248] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 35.434253] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 35.439250] ? unwind_dump+0x4c0/0x4c0 [ 35.443135] ? unwind_dump+0x4c0/0x4c0 [ 35.447006] ? hrtimer_active+0x2fb/0x410 [ 35.451143] ? check_noncircular+0x20/0x20 [ 35.455357] ? check_noncircular+0x20/0x20 [ 35.459571] ? __unwind_start+0x169/0x330 [ 35.463703] ? print_usage_bug+0x480/0x480 [ 35.467924] ? unwind_get_return_address+0x61/0xa0 [ 35.472843] ? __save_stack_trace+0x61/0xd0 [ 35.477162] ? check_noncircular+0x20/0x20 [ 35.481374] ? vring_use_dma_api+0x7f/0xa0 [ 35.485585] ? vring_unmap_one+0x49/0x3d0 [ 35.489722] ? detach_buf+0x463/0x6a0 [ 35.493503] ? print_usage_bug+0x480/0x480 [ 35.497723] ? virtqueue_get_buf_ctx+0x3b1/0x8b0 [ 35.502455] ? common_interrupt+0x9d/0x9d [ 35.506581] ? detach_buf+0x6a0/0x6a0 [ 35.510360] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 35.515364] virtnet_poll+0x304/0xad0 [ 35.519151] ? receive_buf+0x51f0/0x51f0 [ 35.523192] ? unwind_dump+0x4c0/0x4c0 [ 35.527681] ? mark_held_locks+0xb2/0x100 [ 35.531828] ? net_rx_action+0x49b/0x1910 [ 35.535957] net_rx_action+0x792/0x1910 [ 35.539920] ? napi_complete_done+0x6c0/0x6c0 [ 35.544394] ? save_stack_trace+0x16/0x20 [ 35.548518] ? __lock_acquire+0x20fd/0x4620 [ 35.552821] ? __lock_is_held+0xbc/0x140 [ 35.556867] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 35.562049] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 35.567217] ? kvm_sched_clock_read+0x25/0x40 [ 35.571702] ? __lock_is_held+0xbc/0x140 [ 35.575754] ? rcu_read_lock_sched_held+0x108/0x120 [ 35.580749] ? __raise_softirq_irqoff+0x21c/0x2c0 [ 35.585589] ? raise_softirq+0x490/0x490 [ 35.589632] ? lock_downgrade+0x990/0x990 [ 35.593759] ? print_usage_bug+0x480/0x480 [ 35.597974] ? lock_acquire+0x1d5/0x580 [ 35.601929] ? clockevents_program_event+0x163/0x2e0 [ 35.607015] ? trace_hardirqs_off+0xd/0x10 [ 35.611244] ? __napi_schedule+0x25e/0x370 [ 35.615467] ? netdev_info+0x170/0x170 [ 35.619326] ? check_noncircular+0x20/0x20 [ 35.623540] ? __lock_is_held+0xbc/0x140 [ 35.627585] ? check_noncircular+0x20/0x20 [ 35.631793] ? __lock_is_held+0xbc/0x140 [ 35.635835] ? perf_trace_lock+0x860/0x860 [ 35.640066] ? rcu_read_lock_sched_held+0x108/0x120 [ 35.645075] ? __handle_irq_event_percpu+0x308/0x9d0 [ 35.650176] ? __lock_is_held+0xbc/0x140 [ 35.654237] __do_softirq+0x2bb/0xbd0 [ 35.658043] ? __softirqentry_text_start+0x8/0x8 [ 35.662780] ? do_raw_spin_trylock+0x190/0x190 [ 35.667332] ? handle_irq_event_percpu+0x141/0x1b0 [ 35.672247] ? __handle_irq_event_percpu+0x9d0/0x9d0 [ 35.677340] ? _raw_spin_lock+0x32/0x40 [ 35.681306] ? _raw_spin_unlock+0x22/0x30 [ 35.685440] ? handle_edge_irq+0x2b4/0x7c0 [ 35.689665] irq_exit+0x1d3/0x210 [ 35.693094] do_IRQ+0xf6/0x190 [ 35.696263] common_interrupt+0x9d/0x9d [ 35.700217] [ 35.702446] RIP: 0010:lock_is_held_type+0x18b/0x210 [ 35.707438] RSP: 0018:ffff8801c54ef650 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff6e [ 35.715120] RAX: dffffc0000000000 RBX: 0000000000000282 RCX: 0000000000000000 [ 35.722365] RDX: 1ffffffff0b592fd RSI: ffffffff85b38180 RDI: 0000000000000282 [ 35.729614] RBP: ffff8801c54ef670 R08: ffff8801c54eeda8 R09: 0000000000000000 [ 35.736863] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c52ee5c0 [ 35.744110] R13: 0000000000000000 R14: 00000000000011c9 R15: dffffc0000000000 [ 35.751383] ___might_sleep+0x39b/0x470 [ 35.755332] ? check_same_owner+0x320/0x320 [ 35.759626] ? __raw_spin_lock_init+0x1c/0x100 [ 35.764187] ? preempt_schedule_common+0x35/0x60 [ 35.768918] clear_huge_page+0x3e1/0x750 [ 35.772964] do_huge_pmd_anonymous_page+0x59c/0x1b00 [ 35.778056] ? __save_stack_trace+0x7e/0xd0 [ 35.782466] ? __thp_get_unmapped_area+0x130/0x130 [ 35.787382] ? save_stack_trace+0x16/0x20 [ 35.791511] ? __lock_acquire+0x20fd/0x4620 [ 35.795837] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 35.801040] ? check_noncircular+0x20/0x20 [ 35.805256] ? perf_trace_lock_acquire+0xfe/0x900 [ 35.810073] ? perf_trace_lock_acquire+0xfe/0x900 [ 35.814923] __handle_mm_fault+0x1827/0x39c0 [ 35.819334] ? __pmd_alloc+0x4e0/0x4e0 [ 35.823221] ? lock_downgrade+0x990/0x990 [ 35.827341] ? check_noncircular+0x20/0x20 [ 35.831556] ? __lock_is_held+0xbc/0x140 [ 35.835623] handle_mm_fault+0x334/0x8d0 [ 35.839662] ? down_read_trylock+0xdb/0x170 [ 35.843963] ? __do_page_fault+0x2b8/0xb60 [ 35.848172] ? __handle_mm_fault+0x39c0/0x39c0 [ 35.852738] ? vmacache_find+0x61/0x270 [ 35.856694] ? vmacache_update+0xfe/0x130 [ 35.860826] ? find_vma+0x30/0x150 [ 35.864354] __do_page_fault+0x4f6/0xb60 [ 35.868408] do_page_fault+0xee/0x720 [ 35.872190] ? _raw_spin_unlock_irq+0x27/0x70 [ 35.876667] ? __do_page_fault+0xb60/0xb60 [ 35.880883] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 35.885893] ? lockdep_sys_exit+0x47/0xf0 [ 35.890030] ? syscall_return_slowpath+0x2b3/0x500 [ 35.894937] ? finish_task_switch+0x1aa/0x740 [ 35.899410] ? prepare_exit_to_usermode+0x2c0/0x2c0 [ 35.904415] ? entry_SYSCALL_64_fastpath+0x4b/0xbe [ 35.909335] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.914170] page_fault+0x22/0x30 [ 35.917595] RIP: 0033:0x400db4 [ 35.920757] RSP: 002b:00007f824b0f2dd0 EFLAGS: 00010202 [ 35.926101] RAX: 00007f824b0f3700 RBX: 0000000000000000 RCX: 0000000000402784 [ 35.933347] RDX: 2eece99104bcbcf1 RSI: 0000000000000000 RDI: 0000000000000006 [ 35.940590] RBP: 0000000000000000 R08: 00007f824b0f3700 R09: 00007f824b0f3700 [ 35.947833] R10: 00007f824b0f39d0 R11: 0000000000000202 R12: 0000000000000000 [ 35.955083] R13: 00007ffd27a088ef R14: 00007f824b0f39c0 R15: 0000000000000000 [ 35.962346] [ 35.963951] Allocated by task 7777: [ 35.967557] save_stack_trace+0x16/0x20 [ 35.971502] save_stack+0x43/0xd0 [ 35.974929] kasan_kmalloc+0xad/0xe0 [ 35.978614] kmem_cache_alloc_trace+0x136/0x750 [ 35.983257] fanout_add+0xa50/0x1190 [ 35.986944] packet_setsockopt+0xfdc/0x1e80 [ 35.991245] SyS_setsockopt+0x189/0x360 [ 35.995204] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 35.999937] [ 36.001537] Freed by task 7728: [ 36.004791] save_stack_trace+0x16/0x20 [ 36.008741] save_stack+0x43/0xd0 [ 36.012177] kasan_slab_free+0x71/0xc0 [ 36.016042] kfree+0xca/0x250 [ 36.019132] packet_release+0xa8f/0xd70 [ 36.023091] sock_release+0x8d/0x1e0 [ 36.026783] sock_close+0x16/0x20 [ 36.030221] __fput+0x333/0x7f0 [ 36.033475] ____fput+0x15/0x20 [ 36.036727] task_work_run+0x199/0x270 [ 36.040585] do_exit+0xa52/0x1b40 [ 36.044019] do_group_exit+0x149/0x400 [ 36.047887] SyS_exit_group+0x1d/0x20 [ 36.051668] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 36.056405] [ 36.058026] The buggy address belongs to the object at ffff8801c5648c80 [ 36.058026] which belongs to the cache kmalloc-4096 of size 4096 [ 36.070842] The buggy address is located 2176 bytes inside of