Warning: Permanently added '10.128.0.172' (ECDSA) to the list of known hosts. 2020/06/17 05:28:20 fuzzer started 2020/06/17 05:28:20 connecting to host at 10.128.0.26:33939 2020/06/17 05:28:20 checking machine... 2020/06/17 05:28:20 checking revisions... 2020/06/17 05:28:20 testing simple program... syzkaller login: [ 60.047338][ T6794] IPVS: ftp: loaded support on port[0] = 21 2020/06/17 05:28:20 building call list... [ 60.361477][ T2550] tipc: TX() has been purged, node left! [ 60.873329][ T2550] ================================================================== [ 60.881761][ T2550] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 60.890711][ T2550] Write of size 1 at addr ffff8880955771e4 by task kworker/u4:5/2550 [ 60.898762][ T2550] [ 60.901095][ T2550] CPU: 0 PID: 2550 Comm: kworker/u4:5 Not tainted 5.8.0-rc1-syzkaller #0 [ 60.909595][ T2550] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.919787][ T2550] Workqueue: netns cleanup_net [ 60.924737][ T2550] Call Trace: [ 60.928034][ T2550] dump_stack+0x18f/0x20d [ 60.932379][ T2550] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.937922][ T2550] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.943477][ T2550] ? afs_put_call+0xa40/0xa40 [ 60.948243][ T2550] print_address_description.constprop.0.cold+0xd3/0x413 [ 60.955269][ T2550] ? vprintk_func+0x97/0x1a6 [ 60.959866][ T2550] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.965408][ T2550] kasan_report.cold+0x1f/0x37 [ 60.970175][ T2550] ? rcu_read_lock_held_common+0x51/0xa0 [ 60.975813][ T2550] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.981365][ T2550] afs_wake_up_async_call+0x6aa/0x770 [ 60.986734][ T2550] ? afs_close_socket+0x320/0x320 [ 60.991766][ T2550] ? afs_put_call+0xa40/0xa40 [ 60.996449][ T2550] rxrpc_notify_socket+0x1db/0x5d0 [ 61.001563][ T2550] ? afs_put_call+0xa40/0xa40 [ 61.006432][ T2550] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.013124][ T2550] rxrpc_call_completed+0xca/0xf0 [ 61.018241][ T2550] rxrpc_discard_prealloc+0x781/0xab0 [ 61.023635][ T2550] ? lock_sock_nested+0x94/0x110 [ 61.028595][ T2550] rxrpc_listen+0x147/0x360 [ 61.033658][ T2550] afs_close_socket+0x95/0x320 [ 61.038418][ T2550] ? afs_purge_servers+0x16d/0x300 [ 61.043528][ T2550] ? afs_rx_discard_new_call+0x50/0x50 [ 61.048987][ T2550] ? init_wait_var_entry+0x200/0x200 [ 61.054274][ T2550] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.059904][ T2550] ? check_preemption_disabled+0x38/0x220 [ 61.065638][ T2550] afs_net_exit+0x1bc/0x310 [ 61.070144][ T2550] ? afs_net_init+0xe30/0xe30 [ 61.074823][ T2550] ops_exit_list.isra.0+0xa8/0x150 [ 61.079940][ T2550] cleanup_net+0x511/0xa50 [ 61.084356][ T2550] ? unregister_pernet_device+0x70/0x70 [ 61.089903][ T2550] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.095913][ T2550] process_one_work+0x965/0x1690 [ 61.101227][ T2550] ? lock_release+0x800/0x800 [ 61.105902][ T2550] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.111462][ T2550] ? rwlock_bug.part.0+0x90/0x90 [ 61.116409][ T2550] worker_thread+0x96/0xe10 [ 61.120926][ T2550] ? process_one_work+0x1690/0x1690 [ 61.126121][ T2550] kthread+0x3b5/0x4a0 [ 61.130188][ T2550] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.135901][ T2550] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.142228][ T2550] ret_from_fork+0x1f/0x30 [ 61.146665][ T2550] [ 61.148984][ T2550] Allocated by task 6794: [ 61.153308][ T2550] save_stack+0x1b/0x40 [ 61.157457][ T2550] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 61.163193][ T2550] kmem_cache_alloc_trace+0x153/0x7d0 [ 61.168559][ T2550] afs_alloc_call+0x55/0x630 [ 61.173143][ T2550] afs_charge_preallocation+0xe9/0x2d0 [ 61.178594][ T2550] afs_open_socket+0x292/0x360 [ 61.183348][ T2550] afs_net_init+0xa6c/0xe30 [ 61.187845][ T2550] ops_init+0xaf/0x420 [ 61.191908][ T2550] setup_net+0x2de/0x860 [ 61.196165][ T2550] copy_net_ns+0x293/0x590 [ 61.202267][ T2550] create_new_namespaces+0x3fb/0xb30 [ 61.207980][ T2550] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 61.214039][ T2550] ksys_unshare+0x43d/0x8e0 [ 61.218537][ T2550] __x64_sys_unshare+0x2d/0x40 [ 61.223295][ T2550] do_syscall_64+0x60/0xe0 [ 61.227706][ T2550] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.233580][ T2550] [ 61.235900][ T2550] Freed by task 2550: [ 61.239896][ T2550] save_stack+0x1b/0x40 [ 61.244060][ T2550] __kasan_slab_free+0xf7/0x140 [ 61.248902][ T2550] kfree+0x109/0x2b0 [ 61.252796][ T2550] afs_put_call+0x585/0xa40 [ 61.257383][ T2550] rxrpc_discard_prealloc+0x764/0xab0 [ 61.262765][ T2550] rxrpc_listen+0x147/0x360 [ 61.267698][ T2550] afs_close_socket+0x95/0x320 [ 61.272452][ T2550] afs_net_exit+0x1bc/0x310 [ 61.276947][ T2550] ops_exit_list.isra.0+0xa8/0x150 [ 61.282221][ T2550] cleanup_net+0x511/0xa50 [ 61.286634][ T2550] process_one_work+0x965/0x1690 [ 61.291593][ T2550] worker_thread+0x96/0xe10 [ 61.296311][ T2550] kthread+0x3b5/0x4a0 [ 61.300381][ T2550] ret_from_fork+0x1f/0x30 [ 61.304781][ T2550] [ 61.307104][ T2550] The buggy address belongs to the object at ffff888095577000 [ 61.307104][ T2550] which belongs to the cache kmalloc-1k of size 1024 [ 61.321253][ T2550] The buggy address is located 484 bytes inside of [ 61.321253][ T2550] 1024-byte region [ffff888095577000, ffff888095577400) [ 61.335068][ T2550] The buggy address belongs to the page: [ 61.340698][ T2550] page:ffffea0002555dc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 61.349805][ T2550] flags: 0xfffe0000000200(slab) [ 61.354670][ T2550] raw: 00fffe0000000200 ffffea000261ae88 ffffea0002558588 ffff8880aa000c40 [ 61.363352][ T2550] raw: 0000000000000000 ffff888095577000 0000000100000002 0000000000000000 [ 61.371937][ T2550] page dumped because: kasan: bad access detected [ 61.378494][ T2550] [ 61.380827][ T2550] Memory state around the buggy address: [ 61.386478][ T2550] ffff888095577080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.394884][ T2550] ffff888095577100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.403137][ T2550] >ffff888095577180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.411197][ T2550] ^ [ 61.418824][ T2550] ffff888095577200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.426973][ T2550] ffff888095577280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.435019][ T2550] ================================================================== [ 61.447846][ T2550] Disabling lock debugging due to kernel taint [ 61.454065][ T2550] Kernel panic - not syncing: panic_on_warn set ... [ 61.460739][ T2550] CPU: 0 PID: 2550 Comm: kworker/u4:5 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 61.470563][ T2550] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.480812][ T2550] Workqueue: netns cleanup_net [ 61.485593][ T2550] Call Trace: [ 61.488885][ T2550] dump_stack+0x18f/0x20d [ 61.493234][ T2550] ? afs_wake_up_async_call+0x670/0x770 [ 61.498785][ T2550] ? afs_put_call+0xa40/0xa40 [ 61.503585][ T2550] panic+0x2e3/0x75c [ 61.508445][ T2550] ? __warn_printk+0xf3/0xf3 [ 61.513051][ T2550] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 61.519209][ T2550] ? trace_hardirqs_on+0x55/0x220 [ 61.524236][ T2550] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.529773][ T2550] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.535306][ T2550] ? afs_put_call+0xa40/0xa40 [ 61.539980][ T2550] end_report+0x4d/0x53 [ 61.544126][ T2550] kasan_report.cold+0xd/0x37 [ 61.548817][ T2550] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.554449][ T2550] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.559991][ T2550] afs_wake_up_async_call+0x6aa/0x770 [ 61.565357][ T2550] ? afs_close_socket+0x320/0x320 [ 61.570732][ T2550] ? afs_put_call+0xa40/0xa40 [ 61.575608][ T2550] rxrpc_notify_socket+0x1db/0x5d0 [ 61.581605][ T2550] ? afs_put_call+0xa40/0xa40 [ 61.586412][ T2550] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.593817][ T2550] rxrpc_call_completed+0xca/0xf0 [ 61.598941][ T2550] rxrpc_discard_prealloc+0x781/0xab0 [ 61.604382][ T2550] ? lock_sock_nested+0x94/0x110 [ 61.610287][ T2550] rxrpc_listen+0x147/0x360 [ 61.614784][ T2550] afs_close_socket+0x95/0x320 [ 61.619989][ T2550] ? afs_purge_servers+0x16d/0x300 [ 61.625094][ T2550] ? afs_rx_discard_new_call+0x50/0x50 [ 61.630571][ T2550] ? init_wait_var_entry+0x200/0x200 [ 61.635970][ T2550] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.641597][ T2550] ? check_preemption_disabled+0x38/0x220 [ 61.647315][ T2550] afs_net_exit+0x1bc/0x310 [ 61.651810][ T2550] ? afs_net_init+0xe30/0xe30 [ 61.656480][ T2550] ops_exit_list.isra.0+0xa8/0x150 [ 61.661584][ T2550] cleanup_net+0x511/0xa50 [ 61.666089][ T2550] ? unregister_pernet_device+0x70/0x70 [ 61.671629][ T2550] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.677605][ T2550] process_one_work+0x965/0x1690 [ 61.682538][ T2550] ? lock_release+0x800/0x800 [ 61.687208][ T2550] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.694747][ T2550] ? rwlock_bug.part.0+0x90/0x90 [ 61.699681][ T2550] worker_thread+0x96/0xe10 [ 61.704185][ T2550] ? process_one_work+0x1690/0x1690 [ 61.709378][ T2550] kthread+0x3b5/0x4a0 [ 61.713437][ T2550] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.719148][ T2550] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.724860][ T2550] ret_from_fork+0x1f/0x30 [ 61.730829][ T2550] Kernel Offset: disabled [ 61.735350][ T2550] Rebooting in 86400 seconds..