Warning: Permanently added '10.128.0.158' (ECDSA) to the list of known hosts. 2020/06/18 04:33:47 fuzzer started 2020/06/18 04:33:47 connecting to host at 10.128.0.26:46081 2020/06/18 04:33:47 checking machine... 2020/06/18 04:33:47 checking revisions... 2020/06/18 04:33:47 testing simple program... syzkaller login: [ 63.684170][ T6828] IPVS: ftp: loaded support on port[0] = 21 2020/06/18 04:33:48 building call list... [ 64.008520][ T70] tipc: TX() has been purged, node left! [ 64.570650][ T70] ================================================================== [ 64.578874][ T70] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 64.586761][ T70] Write of size 1 at addr ffff888081ed99e4 by task kworker/u4:3/70 [ 64.594632][ T70] [ 64.596960][ T70] CPU: 0 PID: 70 Comm: kworker/u4:3 Not tainted 5.8.0-rc1-next-20200618-syzkaller #0 [ 64.606918][ T70] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.617799][ T70] Workqueue: netns cleanup_net [ 64.622707][ T70] Call Trace: [ 64.626018][ T70] dump_stack+0x18f/0x20d [ 64.630367][ T70] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.636347][ T70] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.641892][ T70] ? afs_put_call+0xa40/0xa40 [ 64.646840][ T70] print_address_description.constprop.0.cold+0xd3/0x413 [ 64.655516][ T70] ? vprintk_func+0x97/0x1a6 [ 64.660120][ T70] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.665666][ T70] kasan_report.cold+0x1f/0x37 [ 64.670433][ T70] ? rcu_read_lock_held_common+0x71/0xa0 [ 64.676068][ T70] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.681733][ T70] afs_wake_up_async_call+0x6aa/0x770 [ 64.687099][ T70] ? afs_close_socket+0x320/0x320 [ 64.692220][ T70] ? afs_put_call+0xa40/0xa40 [ 64.696893][ T70] rxrpc_notify_socket+0x1db/0x5d0 [ 64.702703][ T70] ? afs_put_call+0xa40/0xa40 [ 64.707382][ T70] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 64.714069][ T70] rxrpc_call_completed+0xca/0xf0 [ 64.719097][ T70] rxrpc_discard_prealloc+0x781/0xab0 [ 64.724566][ T70] ? lock_sock_nested+0x94/0x110 [ 64.729501][ T70] rxrpc_listen+0x147/0x360 [ 64.737663][ T70] afs_close_socket+0x95/0x320 [ 64.742508][ T70] ? afs_purge_servers+0x16d/0x300 [ 64.747623][ T70] ? afs_rx_discard_new_call+0x50/0x50 [ 64.753086][ T70] ? init_wait_var_entry+0x200/0x200 [ 64.758462][ T70] ? rcu_read_lock_held_common+0xa0/0xa0 [ 64.764416][ T70] ? check_preemption_disabled+0x38/0x220 [ 64.771893][ T70] afs_net_exit+0x1bc/0x310 [ 64.776418][ T70] ? afs_net_init+0xe30/0xe30 [ 64.781211][ T70] ops_exit_list.isra.0+0xa8/0x150 [ 64.786612][ T70] cleanup_net+0x511/0xa50 [ 64.791143][ T70] ? unregister_pernet_device+0x70/0x70 [ 64.796697][ T70] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.802683][ T70] process_one_work+0x965/0x1690 [ 64.807628][ T70] ? lock_release+0x800/0x800 [ 64.812307][ T70] ? pwq_dec_nr_in_flight+0x310/0x310 [ 64.817687][ T70] ? rwlock_bug.part.0+0x90/0x90 [ 64.822641][ T70] worker_thread+0x96/0xe10 [ 64.827149][ T70] ? process_one_work+0x1690/0x1690 [ 64.832342][ T70] kthread+0x3b5/0x4a0 [ 64.836408][ T70] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.842124][ T70] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.847867][ T70] ret_from_fork+0x1f/0x30 [ 64.852312][ T70] [ 64.854640][ T70] Allocated by task 6828: [ 64.859225][ T70] save_stack+0x1b/0x40 [ 64.863377][ T70] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 64.869002][ T70] kmem_cache_alloc_trace+0x153/0x7d0 [ 64.874370][ T70] afs_alloc_call+0x55/0x630 [ 64.878991][ T70] afs_charge_preallocation+0xe9/0x2d0 [ 64.884469][ T70] afs_open_socket+0x292/0x360 [ 64.889227][ T70] afs_net_init+0xa6c/0xe30 [ 64.893721][ T70] ops_init+0xaf/0x420 [ 64.897785][ T70] setup_net+0x2de/0x860 [ 64.902028][ T70] copy_net_ns+0x293/0x590 [ 64.906439][ T70] create_new_namespaces+0x3fb/0xb30 [ 64.911728][ T70] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 64.917356][ T70] ksys_unshare+0x445/0x8e0 [ 64.921907][ T70] __x64_sys_unshare+0x2d/0x40 [ 64.926668][ T70] do_syscall_64+0x60/0xe0 [ 64.931164][ T70] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.937128][ T70] [ 64.939451][ T70] Freed by task 70: [ 64.943257][ T70] save_stack+0x1b/0x40 [ 64.947495][ T70] __kasan_slab_free+0xf7/0x140 [ 64.952519][ T70] kfree+0x109/0x2b0 [ 64.956409][ T70] afs_put_call+0x585/0xa40 [ 64.960907][ T70] rxrpc_discard_prealloc+0x764/0xab0 [ 64.966272][ T70] rxrpc_listen+0x147/0x360 [ 64.970875][ T70] afs_close_socket+0x95/0x320 [ 64.975652][ T70] afs_net_exit+0x1bc/0x310 [ 64.980152][ T70] ops_exit_list.isra.0+0xa8/0x150 [ 64.985276][ T70] cleanup_net+0x511/0xa50 [ 64.989688][ T70] process_one_work+0x965/0x1690 [ 64.994617][ T70] worker_thread+0x96/0xe10 [ 64.999115][ T70] kthread+0x3b5/0x4a0 [ 65.003185][ T70] ret_from_fork+0x1f/0x30 [ 65.007591][ T70] [ 65.009918][ T70] The buggy address belongs to the object at ffff888081ed9800 [ 65.009918][ T70] which belongs to the cache kmalloc-1k of size 1024 [ 65.023965][ T70] The buggy address is located 484 bytes inside of [ 65.023965][ T70] 1024-byte region [ffff888081ed9800, ffff888081ed9c00) [ 65.038282][ T70] The buggy address belongs to the page: [ 65.043916][ T70] page:ffffea000207b640 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 65.053103][ T70] flags: 0xfffe0000000200(slab) [ 65.057996][ T70] raw: 00fffe0000000200 ffffea000207b5c8 ffffea000207b6c8 ffff8880aa000c40 [ 65.066583][ T70] raw: 0000000000000000 ffff888081ed9000 0000000100000002 0000000000000000 [ 65.075162][ T70] page dumped because: kasan: bad access detected [ 65.081566][ T70] [ 65.083883][ T70] Memory state around the buggy address: [ 65.089509][ T70] ffff888081ed9880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.097652][ T70] ffff888081ed9900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.105728][ T70] >ffff888081ed9980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.113783][ T70] ^ [ 65.120985][ T70] ffff888081ed9a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.129059][ T70] ffff888081ed9a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.137281][ T70] ================================================================== [ 65.145328][ T70] Disabling lock debugging due to kernel taint [ 65.151685][ T70] Kernel panic - not syncing: panic_on_warn set ... [ 65.158445][ T70] CPU: 0 PID: 70 Comm: kworker/u4:3 Tainted: G B 5.8.0-rc1-next-20200618-syzkaller #0 [ 65.169370][ T70] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.179422][ T70] Workqueue: netns cleanup_net [ 65.184271][ T70] Call Trace: [ 65.187555][ T70] dump_stack+0x18f/0x20d [ 65.191972][ T70] ? afs_wake_up_async_call+0x660/0x770 [ 65.197596][ T70] ? afs_put_call+0xa40/0xa40 [ 65.202276][ T70] panic+0x2e3/0x75c [ 65.206164][ T70] ? __warn_printk+0xf3/0xf3 [ 65.210770][ T70] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 65.216917][ T70] ? trace_hardirqs_on+0x55/0x220 [ 65.221947][ T70] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.227479][ T70] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.233009][ T70] ? afs_put_call+0xa40/0xa40 [ 65.237678][ T70] end_report+0x4d/0x53 [ 65.241860][ T70] kasan_report.cold+0xd/0x37 [ 65.246533][ T70] ? rcu_read_lock_held_common+0x71/0xa0 [ 65.252151][ T70] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.257682][ T70] afs_wake_up_async_call+0x6aa/0x770 [ 65.263064][ T70] ? afs_close_socket+0x320/0x320 [ 65.268075][ T70] ? afs_put_call+0xa40/0xa40 [ 65.272829][ T70] rxrpc_notify_socket+0x1db/0x5d0 [ 65.277930][ T70] ? afs_put_call+0xa40/0xa40 [ 65.282594][ T70] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 65.288995][ T70] rxrpc_call_completed+0xca/0xf0 [ 65.294010][ T70] rxrpc_discard_prealloc+0x781/0xab0 [ 65.300160][ T70] ? lock_sock_nested+0x94/0x110 [ 65.305112][ T70] rxrpc_listen+0x147/0x360 [ 65.309718][ T70] afs_close_socket+0x95/0x320 [ 65.314478][ T70] ? afs_purge_servers+0x16d/0x300 [ 65.319576][ T70] ? afs_rx_discard_new_call+0x50/0x50 [ 65.325034][ T70] ? init_wait_var_entry+0x200/0x200 [ 65.330399][ T70] ? rcu_read_lock_held_common+0xa0/0xa0 [ 65.336028][ T70] ? check_preemption_disabled+0x38/0x220 [ 65.341750][ T70] afs_net_exit+0x1bc/0x310 [ 65.346252][ T70] ? afs_net_init+0xe30/0xe30 [ 65.351027][ T70] ops_exit_list.isra.0+0xa8/0x150 [ 65.356140][ T70] cleanup_net+0x511/0xa50 [ 65.360556][ T70] ? unregister_pernet_device+0x70/0x70 [ 65.367059][ T70] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.373046][ T70] process_one_work+0x965/0x1690 [ 65.378265][ T70] ? lock_release+0x800/0x800 [ 65.383017][ T70] ? pwq_dec_nr_in_flight+0x310/0x310 [ 65.388417][ T70] ? rwlock_bug.part.0+0x90/0x90 [ 65.393359][ T70] worker_thread+0x96/0xe10 [ 65.397869][ T70] ? process_one_work+0x1690/0x1690 [ 65.403167][ T70] kthread+0x3b5/0x4a0 [ 65.407239][ T70] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.413072][ T70] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.418996][ T70] ret_from_fork+0x1f/0x30 [ 65.425002][ T70] Kernel Offset: disabled [ 65.429319][ T70] Rebooting in 86400 seconds..