Warning: Permanently added '10.128.10.43' (ECDSA) to the list of known hosts. 2020/06/19 05:23:07 fuzzer started 2020/06/19 05:23:07 connecting to host at 10.128.0.26:44097 2020/06/19 05:23:07 checking machine... 2020/06/19 05:23:07 checking revisions... 2020/06/19 05:23:07 testing simple program... syzkaller login: [ 61.274843][ T6836] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 05:23:08 building call list... [ 61.580723][ T397] tipc: TX() has been purged, node left! [ 62.102548][ T397] ================================================================== [ 62.110781][ T397] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 62.118665][ T397] Write of size 1 at addr ffff888096fef1e4 by task kworker/u4:4/397 [ 62.126637][ T397] [ 62.128966][ T397] CPU: 0 PID: 397 Comm: kworker/u4:4 Not tainted 5.8.0-rc1-syzkaller #0 [ 62.137276][ T397] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.147329][ T397] Workqueue: netns cleanup_net [ 62.152104][ T397] Call Trace: [ 62.155393][ T397] dump_stack+0x18f/0x20d [ 62.159726][ T397] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.165266][ T397] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.170805][ T397] ? afs_put_call+0xa40/0xa40 [ 62.175480][ T397] print_address_description.constprop.0.cold+0xd3/0x413 [ 62.182502][ T397] ? vprintk_func+0x97/0x1a6 [ 62.187097][ T397] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.192639][ T397] kasan_report.cold+0x1f/0x37 [ 62.197404][ T397] ? rcu_read_lock_held_common+0x51/0xa0 [ 62.203029][ T397] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.208574][ T397] afs_wake_up_async_call+0x6aa/0x770 [ 62.213942][ T397] ? afs_close_socket+0x320/0x320 [ 62.218972][ T397] ? afs_put_call+0xa40/0xa40 [ 62.223646][ T397] rxrpc_notify_socket+0x1db/0x5d0 [ 62.228758][ T397] ? afs_put_call+0xa40/0xa40 [ 62.233433][ T397] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.239845][ T397] rxrpc_call_completed+0xca/0xf0 [ 62.245038][ T397] rxrpc_discard_prealloc+0x781/0xab0 [ 62.250531][ T397] ? lock_sock_nested+0x94/0x110 [ 62.255499][ T397] rxrpc_listen+0x147/0x360 [ 62.260029][ T397] afs_close_socket+0x95/0x320 [ 62.264793][ T397] ? afs_purge_servers+0x16d/0x300 [ 62.269906][ T397] ? afs_rx_discard_new_call+0x50/0x50 [ 62.275364][ T397] ? init_wait_var_entry+0x200/0x200 [ 62.280653][ T397] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.286303][ T397] ? check_preemption_disabled+0x38/0x220 [ 62.292041][ T397] afs_net_exit+0x1bc/0x310 [ 62.296547][ T397] ? afs_net_init+0xe30/0xe30 [ 62.301224][ T397] ops_exit_list.isra.0+0xa8/0x150 [ 62.306340][ T397] cleanup_net+0x511/0xa50 [ 62.310762][ T397] ? unregister_pernet_device+0x70/0x70 [ 62.316310][ T397] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.322303][ T397] process_one_work+0x965/0x1690 [ 62.327253][ T397] ? lock_release+0x800/0x800 [ 62.331945][ T397] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.337319][ T397] ? rwlock_bug.part.0+0x90/0x90 [ 62.342269][ T397] worker_thread+0x96/0xe10 [ 62.346785][ T397] ? process_one_work+0x1690/0x1690 [ 62.351991][ T397] kthread+0x3b5/0x4a0 [ 62.356058][ T397] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.361864][ T397] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.367588][ T397] ret_from_fork+0x1f/0x30 [ 62.372101][ T397] [ 62.374428][ T397] Allocated by task 6836: [ 62.378752][ T397] save_stack+0x1b/0x40 [ 62.382901][ T397] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 62.388972][ T397] kmem_cache_alloc_trace+0x153/0x7d0 [ 62.394353][ T397] afs_alloc_call+0x55/0x630 [ 62.398957][ T397] afs_charge_preallocation+0xe9/0x2d0 [ 62.404420][ T397] afs_open_socket+0x292/0x360 [ 62.409185][ T397] afs_net_init+0xa6c/0xe30 [ 62.413685][ T397] ops_init+0xaf/0x420 [ 62.417747][ T397] setup_net+0x2de/0x860 [ 62.422087][ T397] copy_net_ns+0x293/0x590 [ 62.426544][ T397] create_new_namespaces+0x3fb/0xb30 [ 62.431828][ T397] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 62.437468][ T397] ksys_unshare+0x43d/0x8e0 [ 62.441994][ T397] __x64_sys_unshare+0x2d/0x40 [ 62.446753][ T397] do_syscall_64+0x60/0xe0 [ 62.451167][ T397] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 62.457056][ T397] [ 62.459407][ T397] Freed by task 397: [ 62.463300][ T397] save_stack+0x1b/0x40 [ 62.467465][ T397] __kasan_slab_free+0xf7/0x140 [ 62.472319][ T397] kfree+0x109/0x2b0 [ 62.476212][ T397] afs_put_call+0x585/0xa40 [ 62.480722][ T397] rxrpc_discard_prealloc+0x764/0xab0 [ 62.486198][ T397] rxrpc_listen+0x147/0x360 [ 62.490695][ T397] afs_close_socket+0x95/0x320 [ 62.495452][ T397] afs_net_exit+0x1bc/0x310 [ 62.499957][ T397] ops_exit_list.isra.0+0xa8/0x150 [ 62.505059][ T397] cleanup_net+0x511/0xa50 [ 62.509469][ T397] process_one_work+0x965/0x1690 [ 62.514401][ T397] worker_thread+0x96/0xe10 [ 62.518897][ T397] kthread+0x3b5/0x4a0 [ 62.522968][ T397] ret_from_fork+0x1f/0x30 [ 62.527394][ T397] [ 62.529724][ T397] The buggy address belongs to the object at ffff888096fef000 [ 62.529724][ T397] which belongs to the cache kmalloc-1k of size 1024 [ 62.543783][ T397] The buggy address is located 484 bytes inside of [ 62.543783][ T397] 1024-byte region [ffff888096fef000, ffff888096fef400) [ 62.557171][ T397] The buggy address belongs to the page: [ 62.562804][ T397] page:ffffea00025bfbc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 62.571902][ T397] flags: 0xfffe0000000200(slab) [ 62.576927][ T397] raw: 00fffe0000000200 ffffea0002682488 ffffea0002914fc8 ffff8880aa000c40 [ 62.585520][ T397] raw: 0000000000000000 ffff888096fef000 0000000100000002 0000000000000000 [ 62.594104][ T397] page dumped because: kasan: bad access detected [ 62.600516][ T397] [ 62.602845][ T397] Memory state around the buggy address: [ 62.608482][ T397] ffff888096fef080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.616543][ T397] ffff888096fef100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.624602][ T397] >ffff888096fef180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.632653][ T397] ^ [ 62.639840][ T397] ffff888096fef200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.647899][ T397] ffff888096fef280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.655950][ T397] ================================================================== [ 62.663998][ T397] Disabling lock debugging due to kernel taint [ 62.670174][ T397] Kernel panic - not syncing: panic_on_warn set ... [ 62.676755][ T397] CPU: 0 PID: 397 Comm: kworker/u4:4 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 62.686467][ T397] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.696530][ T397] Workqueue: netns cleanup_net [ 62.701277][ T397] Call Trace: [ 62.704564][ T397] dump_stack+0x18f/0x20d [ 62.708889][ T397] ? afs_wake_up_async_call+0x680/0x770 [ 62.714421][ T397] ? afs_put_call+0xa40/0xa40 [ 62.719090][ T397] panic+0x2e3/0x75c [ 62.722977][ T397] ? __warn_printk+0xf3/0xf3 [ 62.727590][ T397] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 62.733737][ T397] ? trace_hardirqs_on+0x55/0x220 [ 62.738754][ T397] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.744294][ T397] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.749826][ T397] ? afs_put_call+0xa40/0xa40 [ 62.754499][ T397] end_report+0x4d/0x53 [ 62.758668][ T397] kasan_report.cold+0xd/0x37 [ 62.763339][ T397] ? rcu_read_lock_held_common+0x51/0xa0 [ 62.768960][ T397] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.774495][ T397] afs_wake_up_async_call+0x6aa/0x770 [ 62.779866][ T397] ? afs_close_socket+0x320/0x320 [ 62.784882][ T397] ? afs_put_call+0xa40/0xa40 [ 62.789551][ T397] rxrpc_notify_socket+0x1db/0x5d0 [ 62.794655][ T397] ? afs_put_call+0xa40/0xa40 [ 62.799324][ T397] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.805728][ T397] rxrpc_call_completed+0xca/0xf0 [ 62.810745][ T397] rxrpc_discard_prealloc+0x781/0xab0 [ 62.816111][ T397] ? lock_sock_nested+0x94/0x110 [ 62.821062][ T397] rxrpc_listen+0x147/0x360 [ 62.825556][ T397] afs_close_socket+0x95/0x320 [ 62.830309][ T397] ? afs_purge_servers+0x16d/0x300 [ 62.835409][ T397] ? afs_rx_discard_new_call+0x50/0x50 [ 62.840861][ T397] ? init_wait_var_entry+0x200/0x200 [ 62.846143][ T397] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.851763][ T397] ? check_preemption_disabled+0x38/0x220 [ 62.857499][ T397] afs_net_exit+0x1bc/0x310 [ 62.861989][ T397] ? afs_net_init+0xe30/0xe30 [ 62.866657][ T397] ops_exit_list.isra.0+0xa8/0x150 [ 62.871758][ T397] cleanup_net+0x511/0xa50 [ 62.876164][ T397] ? unregister_pernet_device+0x70/0x70 [ 62.881713][ T397] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.887691][ T397] process_one_work+0x965/0x1690 [ 62.892631][ T397] ? lock_release+0x800/0x800 [ 62.897300][ T397] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.902663][ T397] ? rwlock_bug.part.0+0x90/0x90 [ 62.907596][ T397] worker_thread+0x96/0xe10 [ 62.912096][ T397] ? process_one_work+0x1690/0x1690 [ 62.917284][ T397] kthread+0x3b5/0x4a0 [ 62.921358][ T397] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.927066][ T397] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.932777][ T397] ret_from_fork+0x1f/0x30 [ 62.938633][ T397] Kernel Offset: disabled [ 62.942945][ T397] Rebooting in 86400 seconds..