Warning: Permanently added '10.128.0.72' (ECDSA) to the list of known hosts. 2020/06/19 01:54:47 fuzzer started 2020/06/19 01:54:47 connecting to host at 10.128.0.26:42783 2020/06/19 01:54:47 checking machine... 2020/06/19 01:54:47 checking revisions... 2020/06/19 01:54:47 testing simple program... syzkaller login: [ 60.694850][ T6809] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 01:54:47 building call list... [ 61.043577][ T21] tipc: TX() has been purged, node left! [ 61.565798][ T21] ================================================================== [ 61.574162][ T21] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 61.582062][ T21] Write of size 1 at addr ffff8880a86121e4 by task kworker/u4:1/21 [ 61.589956][ T21] [ 61.592298][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.8.0-rc1-syzkaller #0 [ 61.600674][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.610739][ T21] Workqueue: netns cleanup_net [ 61.615590][ T21] Call Trace: [ 61.619243][ T21] dump_stack+0x18f/0x20d [ 61.623712][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.629268][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.634835][ T21] ? afs_put_call+0xa40/0xa40 [ 61.639521][ T21] print_address_description.constprop.0.cold+0xd3/0x413 [ 61.646751][ T21] ? vprintk_func+0x97/0x1a6 [ 61.651448][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.657014][ T21] kasan_report.cold+0x1f/0x37 [ 61.661928][ T21] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.667588][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.673162][ T21] afs_wake_up_async_call+0x6aa/0x770 [ 61.678586][ T21] ? afs_close_socket+0x320/0x320 [ 61.683863][ T21] ? afs_put_call+0xa40/0xa40 [ 61.688558][ T21] rxrpc_notify_socket+0x1db/0x5d0 [ 61.693855][ T21] ? afs_put_call+0xa40/0xa40 [ 61.698552][ T21] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.705072][ T21] rxrpc_call_completed+0xca/0xf0 [ 61.710233][ T21] rxrpc_discard_prealloc+0x781/0xab0 [ 61.715634][ T21] ? lock_sock_nested+0x94/0x110 [ 61.720589][ T21] rxrpc_listen+0x147/0x360 [ 61.725108][ T21] afs_close_socket+0x95/0x320 [ 61.729878][ T21] ? afs_purge_servers+0x16d/0x300 [ 61.735199][ T21] ? afs_rx_discard_new_call+0x50/0x50 [ 61.740941][ T21] ? init_wait_var_entry+0x200/0x200 [ 61.746414][ T21] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.753294][ T21] ? check_preemption_disabled+0x38/0x220 [ 61.759116][ T21] afs_net_exit+0x1bc/0x310 [ 61.763732][ T21] ? afs_net_init+0xe30/0xe30 [ 61.768657][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 61.774048][ T21] cleanup_net+0x511/0xa50 [ 61.778781][ T21] ? unregister_pernet_device+0x70/0x70 [ 61.784347][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.790351][ T21] process_one_work+0x965/0x1690 [ 61.795776][ T21] ? lock_release+0x800/0x800 [ 61.800570][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.806045][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 61.811133][ T21] worker_thread+0x96/0xe10 [ 61.815663][ T21] ? process_one_work+0x1690/0x1690 [ 61.820883][ T21] kthread+0x3b5/0x4a0 [ 61.824965][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.830871][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.837127][ T21] ret_from_fork+0x1f/0x30 [ 61.841683][ T21] [ 61.844023][ T21] Allocated by task 6809: [ 61.848364][ T21] save_stack+0x1b/0x40 [ 61.852525][ T21] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 61.858162][ T21] kmem_cache_alloc_trace+0x153/0x7d0 [ 61.863546][ T21] afs_alloc_call+0x55/0x630 [ 61.868351][ T21] afs_charge_preallocation+0xe9/0x2d0 [ 61.873900][ T21] afs_open_socket+0x292/0x360 [ 61.878754][ T21] afs_net_init+0xa6c/0xe30 [ 61.883275][ T21] ops_init+0xaf/0x420 [ 61.887349][ T21] setup_net+0x2de/0x860 [ 61.891595][ T21] copy_net_ns+0x293/0x590 [ 61.896105][ T21] create_new_namespaces+0x3fb/0xb30 [ 61.901547][ T21] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 61.907306][ T21] ksys_unshare+0x43d/0x8e0 [ 61.911926][ T21] __x64_sys_unshare+0x2d/0x40 [ 61.916737][ T21] do_syscall_64+0x60/0xe0 [ 61.921175][ T21] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.927086][ T21] [ 61.929419][ T21] Freed by task 21: [ 61.933506][ T21] save_stack+0x1b/0x40 [ 61.937764][ T21] __kasan_slab_free+0xf7/0x140 [ 61.942708][ T21] kfree+0x109/0x2b0 [ 61.946609][ T21] afs_put_call+0x585/0xa40 [ 61.951129][ T21] rxrpc_discard_prealloc+0x764/0xab0 [ 61.956647][ T21] rxrpc_listen+0x147/0x360 [ 61.961350][ T21] afs_close_socket+0x95/0x320 [ 61.966122][ T21] afs_net_exit+0x1bc/0x310 [ 61.970637][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 61.975997][ T21] cleanup_net+0x511/0xa50 [ 61.980633][ T21] process_one_work+0x965/0x1690 [ 61.985742][ T21] worker_thread+0x96/0xe10 [ 61.990857][ T21] kthread+0x3b5/0x4a0 [ 61.994985][ T21] ret_from_fork+0x1f/0x30 [ 61.999485][ T21] [ 62.001821][ T21] The buggy address belongs to the object at ffff8880a8612000 [ 62.001821][ T21] which belongs to the cache kmalloc-1k of size 1024 [ 62.016250][ T21] The buggy address is located 484 bytes inside of [ 62.016250][ T21] 1024-byte region [ffff8880a8612000, ffff8880a8612400) [ 62.029938][ T21] The buggy address belongs to the page: [ 62.035757][ T21] page:ffffea0002a18480 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 62.044983][ T21] flags: 0xfffe0000000200(slab) [ 62.049848][ T21] raw: 00fffe0000000200 ffffea00029e8088 ffffea0002a59d88 ffff8880aa000c40 [ 62.058519][ T21] raw: 0000000000000000 ffff8880a8612000 0000000100000002 0000000000000000 [ 62.067600][ T21] page dumped because: kasan: bad access detected [ 62.074076][ T21] [ 62.076413][ T21] Memory state around the buggy address: [ 62.082052][ T21] ffff8880a8612080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.090261][ T21] ffff8880a8612100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.098502][ T21] >ffff8880a8612180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.106886][ T21] ^ [ 62.114534][ T21] ffff8880a8612200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.123156][ T21] ffff8880a8612280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.131353][ T21] ================================================================== [ 62.140092][ T21] Disabling lock debugging due to kernel taint [ 62.146532][ T21] Kernel panic - not syncing: panic_on_warn set ... [ 62.156090][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 62.166071][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.176397][ T21] Workqueue: netns cleanup_net [ 62.181160][ T21] Call Trace: [ 62.184556][ T21] dump_stack+0x18f/0x20d [ 62.188906][ T21] ? afs_wake_up_async_call+0x670/0x770 [ 62.194461][ T21] ? afs_put_call+0xa40/0xa40 [ 62.199167][ T21] panic+0x2e3/0x75c [ 62.203435][ T21] ? __warn_printk+0xf3/0xf3 [ 62.208088][ T21] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 62.214250][ T21] ? trace_hardirqs_on+0x55/0x220 [ 62.219454][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.225465][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.231069][ T21] ? afs_put_call+0xa40/0xa40 [ 62.236126][ T21] end_report+0x4d/0x53 [ 62.240375][ T21] kasan_report.cold+0xd/0x37 [ 62.245200][ T21] ? rcu_read_lock_held_common+0x51/0xa0 [ 62.251292][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.256931][ T21] afs_wake_up_async_call+0x6aa/0x770 [ 62.262330][ T21] ? afs_close_socket+0x320/0x320 [ 62.267362][ T21] ? afs_put_call+0xa40/0xa40 [ 62.272451][ T21] rxrpc_notify_socket+0x1db/0x5d0 [ 62.277715][ T21] ? afs_put_call+0xa40/0xa40 [ 62.282399][ T21] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.288957][ T21] rxrpc_call_completed+0xca/0xf0 [ 62.294292][ T21] rxrpc_discard_prealloc+0x781/0xab0 [ 62.299956][ T21] ? lock_sock_nested+0x94/0x110 [ 62.305868][ T21] rxrpc_listen+0x147/0x360 [ 62.310477][ T21] afs_close_socket+0x95/0x320 [ 62.315464][ T21] ? afs_purge_servers+0x16d/0x300 [ 62.320598][ T21] ? afs_rx_discard_new_call+0x50/0x50 [ 62.326158][ T21] ? init_wait_var_entry+0x200/0x200 [ 62.331606][ T21] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.337422][ T21] ? check_preemption_disabled+0x38/0x220 [ 62.343346][ T21] afs_net_exit+0x1bc/0x310 [ 62.347855][ T21] ? afs_net_init+0xe30/0xe30 [ 62.352693][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 62.357958][ T21] cleanup_net+0x511/0xa50 [ 62.362562][ T21] ? unregister_pernet_device+0x70/0x70 [ 62.368251][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.374329][ T21] process_one_work+0x965/0x1690 [ 62.379476][ T21] ? lock_release+0x800/0x800 [ 62.384159][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.389805][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 62.394949][ T21] worker_thread+0x96/0xe10 [ 62.399475][ T21] ? process_one_work+0x1690/0x1690 [ 62.404766][ T21] kthread+0x3b5/0x4a0 [ 62.408863][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.414940][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.420753][ T21] ret_from_fork+0x1f/0x30 [ 62.426920][ T21] Kernel Offset: disabled [ 62.431917][ T21] Rebooting in 86400 seconds..