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-3,10.128.0.5' (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 syzkaller login: [ 40.604238] dev_remove_pack: ffff8801c5675d40 not found executing program executing program executing program executing program executing program executing program executing program executing program [ 40.704381] ================================================================== [ 40.711783] BUG: KASAN: use-after-free in __netif_receive_skb_core+0x2be3/0x33d0 [ 40.719288] Read of size 2 at addr ffff8801c5676b40 by task syzkaller032978/7329 [ 40.726787] [ 40.728391] CPU: 0 PID: 7329 Comm: syzkaller032978 Not tainted 4.13.0-mm1+ #7 [ 40.735632] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.744955] Call Trace: [ 40.747505] [ 40.749630] dump_stack+0x194/0x257 [ 40.753231] ? arch_local_irq_restore+0x53/0x53 [ 40.757874] ? show_regs_print_info+0x65/0x65 [ 40.762347] ? __netif_receive_skb_core+0x2be3/0x33d0 [ 40.767513] print_address_description+0x73/0x250 [ 40.772337] ? __netif_receive_skb_core+0x2be3/0x33d0 [ 40.777507] kasan_report+0x24e/0x340 [ 40.781281] __asan_report_load2_noabort+0x14/0x20 [ 40.786180] __netif_receive_skb_core+0x2be3/0x33d0 [ 40.791166] ? __bpf_address_lookup+0x2b0/0x2b0 [ 40.795817] ? nf_ingress+0x9f0/0x9f0 [ 40.799588] ? unwind_dump+0x4c0/0x4c0 [ 40.803463] ? check_noncircular+0x20/0x20 [ 40.807667] ? __kernel_text_address+0xae/0xe0 [ 40.812225] ? unwind_get_return_address+0x61/0xa0 [ 40.817128] ? __save_stack_trace+0x7e/0xd0 [ 40.821428] ? depot_save_stack+0x12c/0x490 [ 40.825731] ? find_held_lock+0x39/0x1d0 [ 40.829775] ? lock_downgrade+0x990/0x990 [ 40.833893] ? SyS_clone+0x37/0x50 [ 40.837412] ? lock_acquire+0x1d5/0x580 [ 40.841356] ? netif_receive_skb_internal+0x1d7/0x670 [ 40.846517] ? find_held_lock+0x39/0x1d0 [ 40.850570] ? pvclock_read_flags+0x160/0x160 [ 40.855038] ? lock_downgrade+0x990/0x990 [ 40.859165] ? lock_acquire+0x1d5/0x580 [ 40.863110] ? netif_receive_skb_internal+0xa2/0x670 [ 40.868187] ? ktime_get_with_offset+0x2c1/0x420 [ 40.872918] ? lock_release+0xd70/0xd70 [ 40.876861] ? ktime_get+0x3a0/0x3a0 [ 40.880561] __netif_receive_skb+0x2c/0x1b0 [ 40.884852] ? __netif_receive_skb+0x2c/0x1b0 [ 40.889325] netif_receive_skb_internal+0x10b/0x670 [ 40.894314] ? dev_cpu_dead+0xb00/0xb00 [ 40.898260] ? __alloc_pages_nodemask+0xd80/0xd80 [ 40.903076] ? net_rx_action+0x1910/0x1910 [ 40.907286] ? rcu_pm_notify+0xc0/0xc0 [ 40.911151] ? skb_gro_reset_offset+0x17b/0x300 [ 40.915794] napi_gro_receive+0x3d0/0x500 [ 40.919915] ? dev_gro_receive+0x19b0/0x19b0 [ 40.924297] ? eth_type_trans+0x2a3/0x650 [ 40.928420] ? eth_gro_receive+0x810/0x810 [ 40.932636] receive_buf+0xcc5/0x51f0 [ 40.936420] ? virtnet_set_rx_mode+0x9f0/0x9f0 [ 40.940976] ? print_usage_bug+0x480/0x480 [ 40.945193] ? __lock_acquire+0x732/0x4620 [ 40.949408] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 40.954574] ? check_noncircular+0x20/0x20 [ 40.958795] ? print_usage_bug+0x480/0x480 [ 40.963009] ? find_held_lock+0x39/0x1d0 [ 40.967052] ? lock_downgrade+0x990/0x990 [ 40.971171] ? check_noncircular+0x20/0x20 [ 40.975381] ? check_noncircular+0x20/0x20 [ 40.979591] ? pvclock_read_flags+0x160/0x160 [ 40.984060] ? do_raw_spin_trylock+0x190/0x190 [ 40.988622] ? mark_held_locks+0xb2/0x100 [ 40.992745] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 40.997821] ? trace_hardirqs_on_caller+0x19e/0x5c0 [ 41.002808] ? trace_hardirqs_on+0xd/0x10 [ 41.006932] ? update_blocked_averages+0x154f/0x4a30 [ 41.012006] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 41.016996] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 41.022000] ? print_usage_bug+0x480/0x480 [ 41.026212] ? dequeue_task_fair+0x68b0/0x68b0 [ 41.030770] ? __lock_acquire+0x732/0x4620 [ 41.034976] ? lock_downgrade+0x990/0x990 [ 41.039094] ? unwind_get_return_address+0x61/0xa0 [ 41.044002] ? get_stack_info+0x37/0x150 [ 41.048036] ? update_stack_state+0x225/0x700 [ 41.052513] ? __lock_is_held+0xbc/0x140 [ 41.056547] ? lock_acquire+0x256/0x580 [ 41.060504] ? __lock_acquire+0x732/0x4620 [ 41.064711] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 41.069705] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 41.074693] ? unwind_dump+0x4c0/0x4c0 [ 41.078561] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 41.083731] ? __unwind_start+0x169/0x330 [ 41.087855] ? print_usage_bug+0x480/0x480 [ 41.092060] ? unwind_get_return_address+0x61/0xa0 [ 41.096963] ? __save_stack_trace+0x61/0xd0 [ 41.101261] ? lock_acquire+0x256/0x580 [ 41.105213] ? save_stack_trace+0x16/0x20 [ 41.109333] ? __lock_acquire+0x20fd/0x4620 [ 41.113630] ? vring_use_dma_api+0x7f/0xa0 [ 41.117837] ? vring_unmap_one+0x49/0x3d0 [ 41.121961] ? detach_buf+0x463/0x6a0 [ 41.125748] ? virtqueue_get_buf_ctx+0x3b1/0x8b0 [ 41.130477] ? common_interrupt+0x9d/0x9d [ 41.134601] ? detach_buf+0x6a0/0x6a0 [ 41.138379] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 41.143376] virtnet_poll+0x304/0xad0 [ 41.147156] ? receive_buf+0x51f0/0x51f0 [ 41.151185] ? unwind_dump+0x4c0/0x4c0 [ 41.155056] ? net_rx_action+0x49b/0x1910 [ 41.159182] net_rx_action+0x792/0x1910 [ 41.163149] ? napi_complete_done+0x6c0/0x6c0 [ 41.167615] ? save_stack_trace+0x16/0x20 [ 41.171734] ? __lock_acquire+0x20fd/0x4620 [ 41.176044] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 41.181207] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 41.186371] ? pick_next_task_fair+0x1630/0x1630 [ 41.191102] ? print_usage_bug+0x480/0x480 [ 41.195315] ? rcu_pm_notify+0xc0/0xc0 [ 41.199183] ? rcu_read_lock_sched_held+0x108/0x120 [ 41.204174] ? __raise_softirq_irqoff+0x21c/0x2c0 [ 41.208988] ? raise_softirq+0x490/0x490 [ 41.213022] ? run_rebalance_domains+0x383/0x780 [ 41.217764] ? trace_hardirqs_off+0xd/0x10 [ 41.221972] ? __napi_schedule+0x25e/0x370 [ 41.226182] ? netdev_info+0x170/0x170 [ 41.230039] ? check_noncircular+0x20/0x20 [ 41.234242] ? __lock_is_held+0xbc/0x140 [ 41.238278] ? check_noncircular+0x20/0x20 [ 41.242486] ? rcu_pm_notify+0xc0/0xc0 [ 41.246357] ? rcu_read_lock_sched_held+0x108/0x120 [ 41.251346] ? __handle_irq_event_percpu+0x308/0x9d0 [ 41.256427] ? rcu_pm_notify+0xc0/0xc0 [ 41.260301] __do_softirq+0x2bb/0xbd0 [ 41.264084] ? __softirqentry_text_start+0x8/0x8 [ 41.268813] ? do_raw_spin_trylock+0x190/0x190 [ 41.273366] ? handle_irq_event_percpu+0x141/0x1b0 [ 41.278267] ? __handle_irq_event_percpu+0x9d0/0x9d0 [ 41.283351] ? _raw_spin_lock+0x32/0x40 [ 41.287303] ? _raw_spin_unlock+0x22/0x30 [ 41.291424] ? handle_edge_irq+0x2b4/0x7c0 [ 41.295643] irq_exit+0x1d3/0x210 [ 41.299075] do_IRQ+0xf6/0x190 [ 41.302243] common_interrupt+0x9d/0x9d [ 41.306187] [ 41.308396] RIP: 0010:_raw_spin_unlock_irqrestore+0x5e/0xba [ 41.314078] RSP: 0018:ffff8801c5bb79c0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff6e [ 41.321769] RAX: dffffc0000000000 RBX: 0000000000000282 RCX: 0000000000000000 [ 41.329010] RDX: 1ffffffff0b592fd RSI: 0000000000000001 RDI: 0000000000000282 [ 41.336258] RBP: ffff8801c5bb79d0 R08: 1ffff1003b3f1473 R09: 0000000000000000 [ 41.343502] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c54967d0 [ 41.350744] R13: ffff8801db325c00 R14: ffff8801c5bb7ac0 R15: ffff8801db325c18 [ 41.358010] wake_up_new_task+0x62b/0xc00 [ 41.362138] ? to_ratio+0x30/0x30 [ 41.365566] ? lock_release+0xd70/0xd70 [ 41.369511] ? check_same_owner+0x320/0x320 [ 41.373826] _do_fork+0x296/0xfe0 [ 41.377255] ? fork_idle+0x2d0/0x2d0 [ 41.380953] ? lock_downgrade+0x990/0x990 [ 41.385095] ? handle_mm_fault+0x410/0x8d0 [ 41.389302] ? down_read_trylock+0xdb/0x170 [ 41.393602] ? __do_page_fault+0x2b8/0xb60 [ 41.397810] ? __handle_mm_fault+0x39c0/0x39c0 [ 41.402364] ? vmacache_find+0x61/0x270 [ 41.406311] ? vmacache_update+0xfe/0x130 [ 41.410437] ? up_read+0x1a/0x40 [ 41.413782] ? __do_page_fault+0x35b/0xb60 [ 41.417996] SyS_clone+0x37/0x50 [ 41.421337] ? ptregs_sys_rt_sigreturn+0x10/0x10 [ 41.426064] do_syscall_64+0x26c/0x8c0 [ 41.429923] ? __do_page_fault+0xb60/0xb60 [ 41.434133] ? syscall_return_slowpath+0x500/0x500 [ 41.439036] ? SyS_mmap_pgoff+0x243/0x5f0 [ 41.443156] ? lockdep_sys_exit+0x47/0xf0 [ 41.447276] ? entry_SYSCALL_64_fastpath+0x5/0xbe [ 41.452095] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.456913] ? sys_vfork+0x30/0x30 [ 41.460432] entry_SYSCALL64_slow_path+0x25/0x25 [ 41.465157] RIP: 0033:0x449159 [ 41.468319] RSP: 002b:00007ffcf41ad338 EFLAGS: 00000202 ORIG_RAX: 0000000000000038 [ 41.476001] RAX: ffffffffffffffda RBX: 00007f5b7b008700 RCX: 0000000000449159 [ 41.483247] RDX: 00007f5b7b0089d0 RSI: 00007f5b7b007db0 RDI: 00000000003d0f00 [ 41.490490] RBP: 00007ffcf41ad3f0 R08: 00007f5b7b008700 R09: 00007f5b7b008700 [ 41.497731] R10: 00007f5b7b0089d0 R11: 0000000000000202 R12: 0000000000000000 [ 41.504974] R13: 00007ffcf41ad3ef R14: 00007f5b7b0089c0 R15: 0000000000000000 [ 41.512235] [ 41.513860] Allocated by task 7313: [ 41.517460] save_stack_trace+0x16/0x20 [ 41.521406] save_stack+0x43/0xd0 [ 41.524828] kasan_kmalloc+0xad/0xe0 [ 41.528514] kmem_cache_alloc_trace+0x136/0x750 [ 41.533154] fanout_add+0xa50/0x1190 [ 41.536836] packet_setsockopt+0xfdc/0x1e80 [ 41.541130] SyS_setsockopt+0x189/0x360 [ 41.545080] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 41.549801] [ 41.551399] Freed by task 7233: [ 41.554653] save_stack_trace+0x16/0x20 [ 41.558595] save_stack+0x43/0xd0 [ 41.562018] kasan_slab_free+0x71/0xc0 [ 41.565875] kfree+0xca/0x250 [ 41.568951] packet_release+0xa8f/0xd70 [ 41.572892] sock_release+0x8d/0x1e0 [ 41.576574] sock_close+0x16/0x20 [ 41.579995] __fput+0x333/0x7f0 [ 41.583242] ____fput+0x15/0x20 [ 41.586490] task_work_run+0x199/0x270 [ 41.590347] do_exit+0xa52/0x1b40 [ 41.593777] do_group_exit+0x149/0x400 [ 41.597632] SyS_exit_group+0x1d/0x20 [ 41.601401] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 41.606133] [ 41.607732] The buggy address belongs to the object at ffff8801c56762c0 [ 41.607732] which belongs to the cache kmalloc-4096 of size 4096 [ 41.620535] The buggy address is located 2176 bytes inside of [ 41.620535] 4096-byte region [ffff8801c56762c0, ffff8801c56772c0) [ 41.632556] The buggy address belongs to the page: [ 41.637458] page:ffffea0007159d80 count:1 mapcount:0 mapping:ffff8801c56762c0 index:0x0 compound_mapcount: 0 [ 41.647403] flags: 0x200000000008100(slab|head) [ 41.652047] raw: 0200000000008100 ffff8801c56762c0 0000000000000000 0000000100000001 [ 41.659898] raw: ffffea00071575a0 ffffea000715b1a0 ffff8801dac00dc0 0000000000000000 [ 41.667744] page dumped because: kasan: bad access detected [ 41.673421] [ 41.675017] Memory state around the buggy address: [ 41.679914] ffff8801c5676a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.687244] ffff8801c5676a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.694571] >ffff8801c5676b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.701896] ^