Warning: Permanently added '10.128.0.135' (ECDSA) to the list of known hosts. 2020/06/19 06:35:41 fuzzer started 2020/06/19 06:35:41 connecting to host at 10.128.0.26:42003 2020/06/19 06:35:41 checking machine... 2020/06/19 06:35:41 checking revisions... 2020/06/19 06:35:41 testing simple program... syzkaller login: [ 63.769794][ T6804] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 06:35:41 building call list... [ 64.129537][ T38] tipc: TX() has been purged, node left! [ 64.641910][ T38] ================================================================== [ 64.650165][ T38] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 64.658057][ T38] Write of size 1 at addr ffff8880a85b59e4 by task kworker/u4:2/38 [ 64.665964][ T38] [ 64.668298][ T38] CPU: 1 PID: 38 Comm: kworker/u4:2 Not tainted 5.8.0-rc1-syzkaller #0 [ 64.676527][ T38] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.686582][ T38] Workqueue: netns cleanup_net [ 64.691342][ T38] Call Trace: [ 64.694637][ T38] dump_stack+0x18f/0x20d [ 64.698975][ T38] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.704518][ T38] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.710062][ T38] ? afs_put_call+0xa40/0xa40 [ 64.714742][ T38] print_address_description.constprop.0.cold+0xd3/0x413 [ 64.721792][ T38] ? vprintk_func+0x97/0x1a6 [ 64.726387][ T38] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.731930][ T38] kasan_report.cold+0x1f/0x37 [ 64.736700][ T38] ? rcu_read_lock_held_common+0x51/0xa0 [ 64.742330][ T38] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.747877][ T38] afs_wake_up_async_call+0x6aa/0x770 [ 64.753246][ T38] ? afs_close_socket+0x320/0x320 [ 64.758272][ T38] ? afs_put_call+0xa40/0xa40 [ 64.762948][ T38] rxrpc_notify_socket+0x1db/0x5d0 [ 64.768082][ T38] ? afs_put_call+0xa40/0xa40 [ 64.772762][ T38] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 64.779181][ T38] rxrpc_call_completed+0xca/0xf0 [ 64.784211][ T38] rxrpc_discard_prealloc+0x781/0xab0 [ 64.789593][ T38] ? lock_sock_nested+0x94/0x110 [ 64.794535][ T38] rxrpc_listen+0x147/0x360 [ 64.799046][ T38] afs_close_socket+0x95/0x320 [ 64.803809][ T38] ? afs_purge_servers+0x16d/0x300 [ 64.808923][ T38] ? afs_rx_discard_new_call+0x50/0x50 [ 64.814386][ T38] ? init_wait_var_entry+0x200/0x200 [ 64.819676][ T38] ? rcu_read_lock_held_common+0xa0/0xa0 [ 64.825311][ T38] ? check_preemption_disabled+0x38/0x220 [ 64.831035][ T38] afs_net_exit+0x1bc/0x310 [ 64.835566][ T38] ? afs_net_init+0xe30/0xe30 [ 64.840244][ T38] ops_exit_list.isra.0+0xa8/0x150 [ 64.845361][ T38] cleanup_net+0x511/0xa50 [ 64.849782][ T38] ? unregister_pernet_device+0x70/0x70 [ 64.855336][ T38] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.861326][ T38] process_one_work+0x965/0x1690 [ 64.866274][ T38] ? lock_release+0x800/0x800 [ 64.870952][ T38] ? pwq_dec_nr_in_flight+0x310/0x310 [ 64.876327][ T38] ? rwlock_bug.part.0+0x90/0x90 [ 64.881278][ T38] worker_thread+0x96/0xe10 [ 64.885795][ T38] ? process_one_work+0x1690/0x1690 [ 64.891016][ T38] kthread+0x3b5/0x4a0 [ 64.895091][ T38] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.900815][ T38] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.906544][ T38] ret_from_fork+0x1f/0x30 [ 64.911001][ T38] [ 64.913324][ T38] Allocated by task 6804: [ 64.917653][ T38] save_stack+0x1b/0x40 [ 64.921809][ T38] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 64.927435][ T38] kmem_cache_alloc_trace+0x153/0x7d0 [ 64.933234][ T38] afs_alloc_call+0x55/0x630 [ 64.937819][ T38] afs_charge_preallocation+0xe9/0x2d0 [ 64.943271][ T38] afs_open_socket+0x292/0x360 [ 64.948026][ T38] afs_net_init+0xa6c/0xe30 [ 64.952523][ T38] ops_init+0xaf/0x420 [ 64.956585][ T38] setup_net+0x2de/0x860 [ 64.960821][ T38] copy_net_ns+0x293/0x590 [ 64.965234][ T38] create_new_namespaces+0x3fb/0xb30 [ 64.970517][ T38] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 64.976232][ T38] ksys_unshare+0x43d/0x8e0 [ 64.980730][ T38] __x64_sys_unshare+0x2d/0x40 [ 64.985574][ T38] do_syscall_64+0x60/0xe0 [ 64.989988][ T38] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.995866][ T38] [ 64.998189][ T38] Freed by task 38: [ 65.004164][ T38] save_stack+0x1b/0x40 [ 65.008314][ T38] __kasan_slab_free+0xf7/0x140 [ 65.013160][ T38] kfree+0x109/0x2b0 [ 65.017050][ T38] afs_put_call+0x585/0xa40 [ 65.021550][ T38] rxrpc_discard_prealloc+0x764/0xab0 [ 65.026918][ T38] rxrpc_listen+0x147/0x360 [ 65.031420][ T38] afs_close_socket+0x95/0x320 [ 65.036196][ T38] afs_net_exit+0x1bc/0x310 [ 65.040694][ T38] ops_exit_list.isra.0+0xa8/0x150 [ 65.045799][ T38] cleanup_net+0x511/0xa50 [ 65.050223][ T38] process_one_work+0x965/0x1690 [ 65.055159][ T38] worker_thread+0x96/0xe10 [ 65.059785][ T38] kthread+0x3b5/0x4a0 [ 65.063862][ T38] ret_from_fork+0x1f/0x30 [ 65.068272][ T38] [ 65.070605][ T38] The buggy address belongs to the object at ffff8880a85b5800 [ 65.070605][ T38] which belongs to the cache kmalloc-1k of size 1024 [ 65.084759][ T38] The buggy address is located 484 bytes inside of [ 65.084759][ T38] 1024-byte region [ffff8880a85b5800, ffff8880a85b5c00) [ 65.098104][ T38] The buggy address belongs to the page: [ 65.103734][ T38] page:ffffea0002a16d40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 65.112834][ T38] flags: 0xfffe0000000200(slab) [ 65.117835][ T38] raw: 00fffe0000000200 ffffea00027ca748 ffffea00024e6a88 ffff8880aa000c40 [ 65.126428][ T38] raw: 0000000000000000 ffff8880a85b5000 0000000100000002 0000000000000000 [ 65.137028][ T38] page dumped because: kasan: bad access detected [ 65.143430][ T38] [ 65.145783][ T38] Memory state around the buggy address: [ 65.151426][ T38] ffff8880a85b5880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.159492][ T38] ffff8880a85b5900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.167560][ T38] >ffff8880a85b5980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.175710][ T38] ^ [ 65.182936][ T38] ffff8880a85b5a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.191016][ T38] ffff8880a85b5a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.199082][ T38] ================================================================== [ 65.207250][ T38] Disabling lock debugging due to kernel taint [ 65.213447][ T38] Kernel panic - not syncing: panic_on_warn set ... [ 65.220039][ T38] CPU: 1 PID: 38 Comm: kworker/u4:2 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 65.229648][ T38] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.239725][ T38] Workqueue: netns cleanup_net [ 65.244475][ T38] Call Trace: [ 65.247761][ T38] dump_stack+0x18f/0x20d [ 65.252086][ T38] ? afs_wake_up_async_call+0x680/0x770 [ 65.257622][ T38] ? afs_put_call+0xa40/0xa40 [ 65.262292][ T38] panic+0x2e3/0x75c [ 65.266183][ T38] ? __warn_printk+0xf3/0xf3 [ 65.270766][ T38] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 65.276947][ T38] ? trace_hardirqs_on+0x55/0x220 [ 65.281965][ T38] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.287500][ T38] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.293033][ T38] ? afs_put_call+0xa40/0xa40 [ 65.297704][ T38] end_report+0x4d/0x53 [ 65.301854][ T38] kasan_report.cold+0xd/0x37 [ 65.306524][ T38] ? rcu_read_lock_held_common+0x51/0xa0 [ 65.312148][ T38] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.317776][ T38] afs_wake_up_async_call+0x6aa/0x770 [ 65.323139][ T38] ? afs_close_socket+0x320/0x320 [ 65.328156][ T38] ? afs_put_call+0xa40/0xa40 [ 65.332852][ T38] rxrpc_notify_socket+0x1db/0x5d0 [ 65.337955][ T38] ? afs_put_call+0xa40/0xa40 [ 65.342624][ T38] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 65.349034][ T38] rxrpc_call_completed+0xca/0xf0 [ 65.354056][ T38] rxrpc_discard_prealloc+0x781/0xab0 [ 65.359426][ T38] ? lock_sock_nested+0x94/0x110 [ 65.364358][ T38] rxrpc_listen+0x147/0x360 [ 65.368854][ T38] afs_close_socket+0x95/0x320 [ 65.373608][ T38] ? afs_purge_servers+0x16d/0x300 [ 65.378780][ T38] ? afs_rx_discard_new_call+0x50/0x50 [ 65.384233][ T38] ? init_wait_var_entry+0x200/0x200 [ 65.389547][ T38] ? rcu_read_lock_held_common+0xa0/0xa0 [ 65.395174][ T38] ? check_preemption_disabled+0x38/0x220 [ 65.400883][ T38] afs_net_exit+0x1bc/0x310 [ 65.405377][ T38] ? afs_net_init+0xe30/0xe30 [ 65.410044][ T38] ops_exit_list.isra.0+0xa8/0x150 [ 65.415146][ T38] cleanup_net+0x511/0xa50 [ 65.419554][ T38] ? unregister_pernet_device+0x70/0x70 [ 65.425127][ T38] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.431101][ T38] process_one_work+0x965/0x1690 [ 65.436034][ T38] ? lock_release+0x800/0x800 [ 65.440704][ T38] ? pwq_dec_nr_in_flight+0x310/0x310 [ 65.446066][ T38] ? rwlock_bug.part.0+0x90/0x90 [ 65.450999][ T38] worker_thread+0x96/0xe10 [ 65.455585][ T38] ? process_one_work+0x1690/0x1690 [ 65.460775][ T38] kthread+0x3b5/0x4a0 [ 65.464843][ T38] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.470548][ T38] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.476263][ T38] ret_from_fork+0x1f/0x30 [ 65.481930][ T38] Kernel Offset: disabled [ 65.486269][ T38] Rebooting in 86400 seconds..