Warning: Permanently added '10.128.0.208' (ECDSA) to the list of known hosts. 2020/06/19 06:35:42 fuzzer started 2020/06/19 06:35:42 connecting to host at 10.128.0.26:37027 2020/06/19 06:35:42 checking machine... 2020/06/19 06:35:42 checking revisions... 2020/06/19 06:35:42 testing simple program... syzkaller login: [ 61.784616][ T6804] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 06:35:43 building call list... [ 62.127644][ T6754] tipc: TX() has been purged, node left! [ 62.649901][ T6754] ================================================================== [ 62.658149][ T6754] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 62.666038][ T6754] Write of size 1 at addr ffff8880a21489e4 by task kworker/u4:7/6754 [ 62.674128][ T6754] [ 62.676463][ T6754] CPU: 1 PID: 6754 Comm: kworker/u4:7 Not tainted 5.8.0-rc1-syzkaller #0 [ 62.684954][ T6754] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.695192][ T6754] Workqueue: netns cleanup_net [ 62.701598][ T6754] Call Trace: [ 62.704895][ T6754] dump_stack+0x18f/0x20d [ 62.709226][ T6754] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.714775][ T6754] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.720315][ T6754] ? afs_put_call+0xa40/0xa40 [ 62.724993][ T6754] print_address_description.constprop.0.cold+0xd3/0x413 [ 62.732018][ T6754] ? vprintk_func+0x97/0x1a6 [ 62.736701][ T6754] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.742772][ T6754] kasan_report.cold+0x1f/0x37 [ 62.747542][ T6754] ? rcu_read_lock_held_common+0x51/0xa0 [ 62.753170][ T6754] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.760469][ T6754] afs_wake_up_async_call+0x6aa/0x770 [ 62.765840][ T6754] ? afs_close_socket+0x320/0x320 [ 62.771569][ T6754] ? afs_put_call+0xa40/0xa40 [ 62.776247][ T6754] rxrpc_notify_socket+0x1db/0x5d0 [ 62.781535][ T6754] ? afs_put_call+0xa40/0xa40 [ 62.786212][ T6754] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.792635][ T6754] rxrpc_call_completed+0xca/0xf0 [ 62.798607][ T6754] rxrpc_discard_prealloc+0x781/0xab0 [ 62.803989][ T6754] ? lock_sock_nested+0x94/0x110 [ 62.808934][ T6754] rxrpc_listen+0x147/0x360 [ 62.813452][ T6754] afs_close_socket+0x95/0x320 [ 62.818304][ T6754] ? afs_purge_servers+0x16d/0x300 [ 62.823683][ T6754] ? afs_rx_discard_new_call+0x50/0x50 [ 62.829147][ T6754] ? init_wait_var_entry+0x200/0x200 [ 62.834460][ T6754] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.840108][ T6754] ? check_preemption_disabled+0x38/0x220 [ 62.845848][ T6754] afs_net_exit+0x1bc/0x310 [ 62.850351][ T6754] ? afs_net_init+0xe30/0xe30 [ 62.855027][ T6754] ops_exit_list.isra.0+0xa8/0x150 [ 62.860143][ T6754] cleanup_net+0x511/0xa50 [ 62.864562][ T6754] ? unregister_pernet_device+0x70/0x70 [ 62.870287][ T6754] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.876304][ T6754] process_one_work+0x965/0x1690 [ 62.881275][ T6754] ? lock_release+0x800/0x800 [ 62.885954][ T6754] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.891449][ T6754] ? rwlock_bug.part.0+0x90/0x90 [ 62.896410][ T6754] worker_thread+0x96/0xe10 [ 62.900958][ T6754] ? process_one_work+0x1690/0x1690 [ 62.906163][ T6754] kthread+0x3b5/0x4a0 [ 62.910235][ T6754] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.915956][ T6754] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.921682][ T6754] ret_from_fork+0x1f/0x30 [ 62.926107][ T6754] [ 62.928440][ T6754] Allocated by task 6804: [ 62.932769][ T6754] save_stack+0x1b/0x40 [ 62.936923][ T6754] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 62.942554][ T6754] kmem_cache_alloc_trace+0x153/0x7d0 [ 62.947920][ T6754] afs_alloc_call+0x55/0x630 [ 62.952524][ T6754] afs_charge_preallocation+0xe9/0x2d0 [ 62.958064][ T6754] afs_open_socket+0x292/0x360 [ 62.964121][ T6754] afs_net_init+0xa6c/0xe30 [ 62.968622][ T6754] ops_init+0xaf/0x420 [ 62.973638][ T6754] setup_net+0x2de/0x860 [ 62.978135][ T6754] copy_net_ns+0x293/0x590 [ 62.982550][ T6754] create_new_namespaces+0x3fb/0xb30 [ 62.987834][ T6754] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 62.993463][ T6754] ksys_unshare+0x43d/0x8e0 [ 62.997964][ T6754] __x64_sys_unshare+0x2d/0x40 [ 63.002751][ T6754] do_syscall_64+0x60/0xe0 [ 63.007254][ T6754] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 63.013137][ T6754] [ 63.015519][ T6754] Freed by task 6754: [ 63.019852][ T6754] save_stack+0x1b/0x40 [ 63.024006][ T6754] __kasan_slab_free+0xf7/0x140 [ 63.028859][ T6754] kfree+0x109/0x2b0 [ 63.032936][ T6754] afs_put_call+0x585/0xa40 [ 63.037457][ T6754] rxrpc_discard_prealloc+0x764/0xab0 [ 63.042845][ T6754] rxrpc_listen+0x147/0x360 [ 63.047359][ T6754] afs_close_socket+0x95/0x320 [ 63.052130][ T6754] afs_net_exit+0x1bc/0x310 [ 63.056633][ T6754] ops_exit_list.isra.0+0xa8/0x150 [ 63.061742][ T6754] cleanup_net+0x511/0xa50 [ 63.066156][ T6754] process_one_work+0x965/0x1690 [ 63.071093][ T6754] worker_thread+0x96/0xe10 [ 63.075593][ T6754] kthread+0x3b5/0x4a0 [ 63.079665][ T6754] ret_from_fork+0x1f/0x30 [ 63.084069][ T6754] [ 63.086416][ T6754] The buggy address belongs to the object at ffff8880a2148800 [ 63.086416][ T6754] which belongs to the cache kmalloc-1k of size 1024 [ 63.100474][ T6754] The buggy address is located 484 bytes inside of [ 63.100474][ T6754] 1024-byte region [ffff8880a2148800, ffff8880a2148c00) [ 63.114432][ T6754] The buggy address belongs to the page: [ 63.121119][ T6754] page:ffffea0002885200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 63.130566][ T6754] flags: 0xfffe0000000200(slab) [ 63.135417][ T6754] raw: 00fffe0000000200 ffffea0002772648 ffffea00029a26c8 ffff8880aa000c40 [ 63.144024][ T6754] raw: 0000000000000000 ffff8880a2148000 0000000100000002 0000000000000000 [ 63.152600][ T6754] page dumped because: kasan: bad access detected [ 63.159174][ T6754] [ 63.161491][ T6754] Memory state around the buggy address: [ 63.167120][ T6754] ffff8880a2148880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.175177][ T6754] ffff8880a2148900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.183321][ T6754] >ffff8880a2148980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.191370][ T6754] ^ [ 63.198560][ T6754] ffff8880a2148a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.206724][ T6754] ffff8880a2148a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.214772][ T6754] ================================================================== [ 63.222820][ T6754] Disabling lock debugging due to kernel taint [ 63.229035][ T6754] Kernel panic - not syncing: panic_on_warn set ... [ 63.235703][ T6754] CPU: 1 PID: 6754 Comm: kworker/u4:7 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 63.245627][ T6754] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.255713][ T6754] Workqueue: netns cleanup_net [ 63.260500][ T6754] Call Trace: [ 63.263798][ T6754] dump_stack+0x18f/0x20d [ 63.268135][ T6754] ? afs_wake_up_async_call+0x680/0x770 [ 63.273706][ T6754] ? afs_put_call+0xa40/0xa40 [ 63.278481][ T6754] panic+0x2e3/0x75c [ 63.283255][ T6754] ? __warn_printk+0xf3/0xf3 [ 63.287853][ T6754] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 63.294149][ T6754] ? trace_hardirqs_on+0x55/0x220 [ 63.299193][ T6754] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.304736][ T6754] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.310270][ T6754] ? afs_put_call+0xa40/0xa40 [ 63.314935][ T6754] end_report+0x4d/0x53 [ 63.319083][ T6754] kasan_report.cold+0xd/0x37 [ 63.323759][ T6754] ? rcu_read_lock_held_common+0x51/0xa0 [ 63.329389][ T6754] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.334924][ T6754] afs_wake_up_async_call+0x6aa/0x770 [ 63.340378][ T6754] ? afs_close_socket+0x320/0x320 [ 63.345406][ T6754] ? afs_put_call+0xa40/0xa40 [ 63.350075][ T6754] rxrpc_notify_socket+0x1db/0x5d0 [ 63.355173][ T6754] ? afs_put_call+0xa40/0xa40 [ 63.359840][ T6754] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 63.366249][ T6754] rxrpc_call_completed+0xca/0xf0 [ 63.371258][ T6754] rxrpc_discard_prealloc+0x781/0xab0 [ 63.376623][ T6754] ? lock_sock_nested+0x94/0x110 [ 63.381564][ T6754] rxrpc_listen+0x147/0x360 [ 63.386159][ T6754] afs_close_socket+0x95/0x320 [ 63.390902][ T6754] ? afs_purge_servers+0x16d/0x300 [ 63.396088][ T6754] ? afs_rx_discard_new_call+0x50/0x50 [ 63.401896][ T6754] ? init_wait_var_entry+0x200/0x200 [ 63.407178][ T6754] ? rcu_read_lock_held_common+0xa0/0xa0 [ 63.413144][ T6754] ? check_preemption_disabled+0x38/0x220 [ 63.418869][ T6754] afs_net_exit+0x1bc/0x310 [ 63.423366][ T6754] ? afs_net_init+0xe30/0xe30 [ 63.428037][ T6754] ops_exit_list.isra.0+0xa8/0x150 [ 63.433166][ T6754] cleanup_net+0x511/0xa50 [ 63.437583][ T6754] ? unregister_pernet_device+0x70/0x70 [ 63.443113][ T6754] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.449547][ T6754] process_one_work+0x965/0x1690 [ 63.454487][ T6754] ? lock_release+0x800/0x800 [ 63.459323][ T6754] ? pwq_dec_nr_in_flight+0x310/0x310 [ 63.464688][ T6754] ? rwlock_bug.part.0+0x90/0x90 [ 63.469734][ T6754] worker_thread+0x96/0xe10 [ 63.474230][ T6754] ? process_one_work+0x1690/0x1690 [ 63.479447][ T6754] kthread+0x3b5/0x4a0 [ 63.483521][ T6754] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.489261][ T6754] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.494981][ T6754] ret_from_fork+0x1f/0x30 [ 63.500896][ T6754] Kernel Offset: disabled [ 63.505315][ T6754] Rebooting in 86400 seconds..