Warning: Permanently added '10.128.1.3' (ECDSA) to the list of known hosts. 2020/06/17 22:29:43 fuzzer started 2020/06/17 22:29:43 connecting to host at 10.128.0.26:36397 2020/06/17 22:29:43 checking machine... 2020/06/17 22:29:43 checking revisions... 2020/06/17 22:29:43 testing simple program... syzkaller login: [ 65.015988][ T6830] IPVS: ftp: loaded support on port[0] = 21 2020/06/17 22:29:44 building call list... [ 65.343687][ T26] tipc: TX() has been purged, node left! [ 65.875999][ T26] ================================================================== [ 65.884220][ T26] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 65.892103][ T26] Write of size 1 at addr ffff888096ff81e4 by task kworker/u4:2/26 [ 65.899973][ T26] [ 65.902303][ T26] CPU: 1 PID: 26 Comm: kworker/u4:2 Not tainted 5.8.0-rc1-syzkaller #0 [ 65.910531][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.920588][ T26] Workqueue: netns cleanup_net [ 65.925357][ T26] Call Trace: [ 65.928650][ T26] dump_stack+0x18f/0x20d [ 65.932996][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.938539][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.944078][ T26] ? afs_put_call+0xa40/0xa40 [ 65.948767][ T26] print_address_description.constprop.0.cold+0xd3/0x413 [ 65.955794][ T26] ? vprintk_func+0x97/0x1a6 [ 65.960384][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.965924][ T26] kasan_report.cold+0x1f/0x37 [ 65.970689][ T26] ? rcu_read_lock_held_common+0x51/0xa0 [ 65.976321][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.981863][ T26] afs_wake_up_async_call+0x6aa/0x770 [ 65.987228][ T26] ? afs_close_socket+0x320/0x320 [ 65.992246][ T26] ? afs_put_call+0xa40/0xa40 [ 65.996921][ T26] rxrpc_notify_socket+0x1db/0x5d0 [ 66.002030][ T26] ? afs_put_call+0xa40/0xa40 [ 66.006708][ T26] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 66.013122][ T26] rxrpc_call_completed+0xca/0xf0 [ 66.018150][ T26] rxrpc_discard_prealloc+0x781/0xab0 [ 66.023533][ T26] ? lock_sock_nested+0x94/0x110 [ 66.028494][ T26] rxrpc_listen+0x147/0x360 [ 66.032998][ T26] afs_close_socket+0x95/0x320 [ 66.037756][ T26] ? afs_purge_servers+0x16d/0x300 [ 66.042869][ T26] ? afs_rx_discard_new_call+0x50/0x50 [ 66.048335][ T26] ? init_wait_var_entry+0x200/0x200 [ 66.053622][ T26] ? rcu_read_lock_held_common+0xa0/0xa0 [ 66.059249][ T26] ? check_preemption_disabled+0x38/0x220 [ 66.064977][ T26] afs_net_exit+0x1bc/0x310 [ 66.069477][ T26] ? afs_net_init+0xe30/0xe30 [ 66.074148][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 66.079259][ T26] cleanup_net+0x511/0xa50 [ 66.083677][ T26] ? unregister_pernet_device+0x70/0x70 [ 66.089231][ T26] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.095215][ T26] process_one_work+0x965/0x1690 [ 66.100161][ T26] ? lock_release+0x800/0x800 [ 66.104836][ T26] ? pwq_dec_nr_in_flight+0x310/0x310 [ 66.110332][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 66.115288][ T26] worker_thread+0x96/0xe10 [ 66.119807][ T26] ? process_one_work+0x1690/0x1690 [ 66.125003][ T26] kthread+0x3b5/0x4a0 [ 66.129067][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.134778][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.140497][ T26] ret_from_fork+0x1f/0x30 [ 66.144934][ T26] [ 66.147254][ T26] Allocated by task 6830: [ 66.151585][ T26] save_stack+0x1b/0x40 [ 66.155735][ T26] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 66.161359][ T26] kmem_cache_alloc_trace+0x153/0x7d0 [ 66.166722][ T26] afs_alloc_call+0x55/0x630 [ 66.171307][ T26] afs_charge_preallocation+0xe9/0x2d0 [ 66.176757][ T26] afs_open_socket+0x292/0x360 [ 66.181511][ T26] afs_net_init+0xa6c/0xe30 [ 66.186009][ T26] ops_init+0xaf/0x420 [ 66.190076][ T26] setup_net+0x2de/0x860 [ 66.194321][ T26] copy_net_ns+0x293/0x590 [ 66.198741][ T26] create_new_namespaces+0x3fb/0xb30 [ 66.204027][ T26] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 66.209659][ T26] ksys_unshare+0x43d/0x8e0 [ 66.214189][ T26] __x64_sys_unshare+0x2d/0x40 [ 66.218953][ T26] do_syscall_64+0x60/0xe0 [ 66.223390][ T26] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.229269][ T26] [ 66.231592][ T26] Freed by task 26: [ 66.235397][ T26] save_stack+0x1b/0x40 [ 66.239549][ T26] __kasan_slab_free+0xf7/0x140 [ 66.244393][ T26] kfree+0x109/0x2b0 [ 66.248284][ T26] afs_put_call+0x585/0xa40 [ 66.252786][ T26] rxrpc_discard_prealloc+0x764/0xab0 [ 66.258151][ T26] rxrpc_listen+0x147/0x360 [ 66.262656][ T26] afs_close_socket+0x95/0x320 [ 66.267414][ T26] afs_net_exit+0x1bc/0x310 [ 66.271912][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 66.277015][ T26] cleanup_net+0x511/0xa50 [ 66.281426][ T26] process_one_work+0x965/0x1690 [ 66.286359][ T26] worker_thread+0x96/0xe10 [ 66.290874][ T26] kthread+0x3b5/0x4a0 [ 66.294938][ T26] ret_from_fork+0x1f/0x30 [ 66.299355][ T26] [ 66.301682][ T26] The buggy address belongs to the object at ffff888096ff8000 [ 66.301682][ T26] which belongs to the cache kmalloc-1k of size 1024 [ 66.315731][ T26] The buggy address is located 484 bytes inside of [ 66.315731][ T26] 1024-byte region [ffff888096ff8000, ffff888096ff8400) [ 66.329078][ T26] The buggy address belongs to the page: [ 66.334713][ T26] page:ffffea00025bfe00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 66.343831][ T26] flags: 0xfffe0000000200(slab) [ 66.348701][ T26] raw: 00fffe0000000200 ffffea000255c5c8 ffffea00027c7488 ffff8880aa000c40 [ 66.357303][ T26] raw: 0000000000000000 ffff888096ff8000 0000000100000002 0000000000000000 [ 66.365877][ T26] page dumped because: kasan: bad access detected [ 66.372276][ T26] [ 66.374594][ T26] Memory state around the buggy address: [ 66.380221][ T26] ffff888096ff8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.388280][ T26] ffff888096ff8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.396346][ T26] >ffff888096ff8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.404397][ T26] ^ [ 66.411588][ T26] ffff888096ff8200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.419663][ T26] ffff888096ff8280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.427734][ T26] ================================================================== [ 66.435877][ T26] Disabling lock debugging due to kernel taint [ 66.442088][ T26] Kernel panic - not syncing: panic_on_warn set ... [ 66.448677][ T26] CPU: 1 PID: 26 Comm: kworker/u4:2 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 66.458287][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.468340][ T26] Workqueue: netns cleanup_net [ 66.473090][ T26] Call Trace: [ 66.476375][ T26] dump_stack+0x18f/0x20d [ 66.480698][ T26] ? afs_wake_up_async_call+0x680/0x770 [ 66.486231][ T26] ? afs_put_call+0xa40/0xa40 [ 66.490894][ T26] panic+0x2e3/0x75c [ 66.494781][ T26] ? __warn_printk+0xf3/0xf3 [ 66.499364][ T26] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 66.505511][ T26] ? trace_hardirqs_on+0x55/0x220 [ 66.510537][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.516070][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.521614][ T26] ? afs_put_call+0xa40/0xa40 [ 66.526291][ T26] end_report+0x4d/0x53 [ 66.530444][ T26] kasan_report.cold+0xd/0x37 [ 66.535116][ T26] ? rcu_read_lock_held_common+0x51/0xa0 [ 66.540735][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.546273][ T26] afs_wake_up_async_call+0x6aa/0x770 [ 66.551649][ T26] ? afs_close_socket+0x320/0x320 [ 66.556680][ T26] ? afs_put_call+0xa40/0xa40 [ 66.561395][ T26] rxrpc_notify_socket+0x1db/0x5d0 [ 66.566504][ T26] ? afs_put_call+0xa40/0xa40 [ 66.571186][ T26] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 66.577599][ T26] rxrpc_call_completed+0xca/0xf0 [ 66.582625][ T26] rxrpc_discard_prealloc+0x781/0xab0 [ 66.587991][ T26] ? lock_sock_nested+0x94/0x110 [ 66.592923][ T26] rxrpc_listen+0x147/0x360 [ 66.597423][ T26] afs_close_socket+0x95/0x320 [ 66.602188][ T26] ? afs_purge_servers+0x16d/0x300 [ 66.607291][ T26] ? afs_rx_discard_new_call+0x50/0x50 [ 66.612748][ T26] ? init_wait_var_entry+0x200/0x200 [ 66.618028][ T26] ? rcu_read_lock_held_common+0xa0/0xa0 [ 66.623655][ T26] ? check_preemption_disabled+0x38/0x220 [ 66.629371][ T26] afs_net_exit+0x1bc/0x310 [ 66.633870][ T26] ? afs_net_init+0xe30/0xe30 [ 66.638537][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 66.643641][ T26] cleanup_net+0x511/0xa50 [ 66.648054][ T26] ? unregister_pernet_device+0x70/0x70 [ 66.653593][ T26] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.659572][ T26] process_one_work+0x965/0x1690 [ 66.664530][ T26] ? lock_release+0x800/0x800 [ 66.669224][ T26] ? pwq_dec_nr_in_flight+0x310/0x310 [ 66.674593][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 66.679525][ T26] worker_thread+0x96/0xe10 [ 66.684033][ T26] ? process_one_work+0x1690/0x1690 [ 66.689230][ T26] kthread+0x3b5/0x4a0 [ 66.693295][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.699003][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.704720][ T26] ret_from_fork+0x1f/0x30 [ 66.710127][ T26] Kernel Offset: disabled [ 66.714439][ T26] Rebooting in 86400 seconds..