Warning: Permanently added '10.128.15.195' (ECDSA) to the list of known hosts. 2020/06/19 02:38:44 fuzzer started 2020/06/19 02:38:44 connecting to host at 10.128.0.26:40467 2020/06/19 02:38:44 checking machine... 2020/06/19 02:38:44 checking revisions... 2020/06/19 02:38:44 testing simple program... syzkaller login: [ 64.107014][ T6830] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 02:38:44 building call list... [ 64.558029][ T7] tipc: TX() has been purged, node left! [ 65.070145][ T7] ================================================================== [ 65.078391][ T7] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 65.086290][ T7] Write of size 1 at addr ffff888099cef1e4 by task kworker/u4:0/7 [ 65.094078][ T7] [ 65.096409][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc1-syzkaller #0 [ 65.104559][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.114789][ T7] Workqueue: netns cleanup_net [ 65.119542][ T7] Call Trace: [ 65.123390][ T7] dump_stack+0x18f/0x20d [ 65.127718][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.133418][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.138954][ T7] ? afs_put_call+0xa40/0xa40 [ 65.143630][ T7] print_address_description.constprop.0.cold+0xd3/0x413 [ 65.150658][ T7] ? vprintk_func+0x97/0x1a6 [ 65.155248][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.160788][ T7] kasan_report.cold+0x1f/0x37 [ 65.165552][ T7] ? rcu_read_lock_held_common+0x51/0xa0 [ 65.171181][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.176725][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 65.182092][ T7] ? afs_close_socket+0x320/0x320 [ 65.187635][ T7] ? afs_put_call+0xa40/0xa40 [ 65.192305][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 65.197416][ T7] ? afs_put_call+0xa40/0xa40 [ 65.202109][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 65.208525][ T7] rxrpc_call_completed+0xca/0xf0 [ 65.213552][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 65.218929][ T7] ? lock_sock_nested+0x94/0x110 [ 65.223867][ T7] rxrpc_listen+0x147/0x360 [ 65.228369][ T7] afs_close_socket+0x95/0x320 [ 65.233128][ T7] ? afs_purge_servers+0x16d/0x300 [ 65.238260][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 65.244163][ T7] ? init_wait_var_entry+0x200/0x200 [ 65.249551][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 65.255706][ T7] ? check_preemption_disabled+0x38/0x220 [ 65.261521][ T7] afs_net_exit+0x1bc/0x310 [ 65.266026][ T7] ? afs_net_init+0xe30/0xe30 [ 65.271584][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 65.276697][ T7] cleanup_net+0x511/0xa50 [ 65.281295][ T7] ? unregister_pernet_device+0x70/0x70 [ 65.286841][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.292824][ T7] process_one_work+0x965/0x1690 [ 65.297789][ T7] ? lock_release+0x800/0x800 [ 65.302461][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 65.307832][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 65.312774][ T7] worker_thread+0x96/0xe10 [ 65.317288][ T7] ? process_one_work+0x1690/0x1690 [ 65.322485][ T7] kthread+0x3b5/0x4a0 [ 65.326548][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.332265][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.338505][ T7] ret_from_fork+0x1f/0x30 [ 65.342926][ T7] [ 65.345334][ T7] Allocated by task 6830: [ 65.349667][ T7] save_stack+0x1b/0x40 [ 65.353831][ T7] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 65.359468][ T7] kmem_cache_alloc_trace+0x153/0x7d0 [ 65.364849][ T7] afs_alloc_call+0x55/0x630 [ 65.369438][ T7] afs_charge_preallocation+0xe9/0x2d0 [ 65.374890][ T7] afs_open_socket+0x292/0x360 [ 65.379644][ T7] afs_net_init+0xa6c/0xe30 [ 65.384296][ T7] ops_init+0xaf/0x420 [ 65.388354][ T7] setup_net+0x2de/0x860 [ 65.396320][ T7] copy_net_ns+0x293/0x590 [ 65.400734][ T7] create_new_namespaces+0x3fb/0xb30 [ 65.406013][ T7] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 65.411652][ T7] ksys_unshare+0x43d/0x8e0 [ 65.416418][ T7] __x64_sys_unshare+0x2d/0x40 [ 65.421209][ T7] do_syscall_64+0x60/0xe0 [ 65.426814][ T7] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 65.432693][ T7] [ 65.435011][ T7] Freed by task 7: [ 65.439277][ T7] save_stack+0x1b/0x40 [ 65.443427][ T7] __kasan_slab_free+0xf7/0x140 [ 65.448267][ T7] kfree+0x109/0x2b0 [ 65.452153][ T7] afs_put_call+0x585/0xa40 [ 65.456651][ T7] rxrpc_discard_prealloc+0x764/0xab0 [ 65.462014][ T7] rxrpc_listen+0x147/0x360 [ 65.466508][ T7] afs_close_socket+0x95/0x320 [ 65.471353][ T7] afs_net_exit+0x1bc/0x310 [ 65.475857][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 65.481077][ T7] cleanup_net+0x511/0xa50 [ 65.485506][ T7] process_one_work+0x965/0x1690 [ 65.490448][ T7] worker_thread+0x96/0xe10 [ 65.494966][ T7] kthread+0x3b5/0x4a0 [ 65.499058][ T7] ret_from_fork+0x1f/0x30 [ 65.503465][ T7] [ 65.505897][ T7] The buggy address belongs to the object at ffff888099cef000 [ 65.505897][ T7] which belongs to the cache kmalloc-1k of size 1024 [ 65.519953][ T7] The buggy address is located 484 bytes inside of [ 65.519953][ T7] 1024-byte region [ffff888099cef000, ffff888099cef400) [ 65.533301][ T7] The buggy address belongs to the page: [ 65.538940][ T7] page:ffffea0002673bc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 65.548042][ T7] flags: 0xfffe0000000200(slab) [ 65.552895][ T7] raw: 00fffe0000000200 ffffea00029ef088 ffffea00026aa688 ffff8880aa000c40 [ 65.561839][ T7] raw: 0000000000000000 ffff888099cef000 0000000100000002 0000000000000000 [ 65.570416][ T7] page dumped because: kasan: bad access detected [ 65.576907][ T7] [ 65.579235][ T7] Memory state around the buggy address: [ 65.584868][ T7] ffff888099cef080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.593298][ T7] ffff888099cef100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.601353][ T7] >ffff888099cef180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.609407][ T7] ^ [ 65.616595][ T7] ffff888099cef200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.625321][ T7] ffff888099cef280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.633382][ T7] ================================================================== [ 65.641440][ T7] Disabling lock debugging due to kernel taint [ 65.647627][ T7] Kernel panic - not syncing: panic_on_warn set ... [ 65.654219][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 65.663832][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.674126][ T7] Workqueue: netns cleanup_net [ 65.679002][ T7] Call Trace: [ 65.682479][ T7] dump_stack+0x18f/0x20d [ 65.687273][ T7] ? afs_wake_up_async_call+0x670/0x770 [ 65.692902][ T7] ? afs_put_call+0xa40/0xa40 [ 65.697576][ T7] panic+0x2e3/0x75c [ 65.702988][ T7] ? __warn_printk+0xf3/0xf3 [ 65.707667][ T7] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 65.716445][ T7] ? trace_hardirqs_on+0x55/0x220 [ 65.722871][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.728412][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.733954][ T7] ? afs_put_call+0xa40/0xa40 [ 65.738741][ T7] end_report+0x4d/0x53 [ 65.742900][ T7] kasan_report.cold+0xd/0x37 [ 65.747575][ T7] ? rcu_read_lock_held_common+0x51/0xa0 [ 65.753193][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.758828][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 65.764188][ T7] ? afs_close_socket+0x320/0x320 [ 65.769202][ T7] ? afs_put_call+0xa40/0xa40 [ 65.773881][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 65.778986][ T7] ? afs_put_call+0xa40/0xa40 [ 65.786000][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 65.796947][ T7] rxrpc_call_completed+0xca/0xf0 [ 65.802068][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 65.808075][ T7] ? lock_sock_nested+0x94/0x110 [ 65.813008][ T7] rxrpc_listen+0x147/0x360 [ 65.824105][ T7] afs_close_socket+0x95/0x320 [ 65.831300][ T7] ? afs_purge_servers+0x16d/0x300 [ 65.837187][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 65.842644][ T7] ? init_wait_var_entry+0x200/0x200 [ 65.852184][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 65.858881][ T7] ? check_preemption_disabled+0x38/0x220 [ 65.868690][ T7] afs_net_exit+0x1bc/0x310 [ 65.875723][ T7] ? afs_net_init+0xe30/0xe30 [ 65.880621][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 65.887111][ T7] cleanup_net+0x511/0xa50 [ 65.892380][ T7] ? unregister_pernet_device+0x70/0x70 [ 65.898389][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.905718][ T7] process_one_work+0x965/0x1690 [ 65.910747][ T7] ? lock_release+0x800/0x800 [ 65.915709][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 65.921232][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 65.928010][ T7] worker_thread+0x96/0xe10 [ 65.933048][ T7] ? process_one_work+0x1690/0x1690 [ 65.938246][ T7] kthread+0x3b5/0x4a0 [ 65.942302][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.948008][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.953717][ T7] ret_from_fork+0x1f/0x30 [ 65.959428][ T7] Kernel Offset: disabled [ 65.963760][ T7] Rebooting in 86400 seconds..