Warning: Permanently added '10.128.0.218' (ECDSA) to the list of known hosts. 2020/06/19 01:13:12 fuzzer started 2020/06/19 01:13:13 connecting to host at 10.128.0.26:37725 2020/06/19 01:13:13 checking machine... 2020/06/19 01:13:13 checking revisions... 2020/06/19 01:13:13 testing simple program... syzkaller login: [ 61.253839][ T6830] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 01:13:13 building call list... [ 61.583342][ T7] tipc: TX() has been purged, node left! [ 62.125535][ T7] ================================================================== [ 62.133776][ T7] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 62.141660][ T7] Write of size 1 at addr ffff88809e4111e4 by task kworker/u4:0/7 [ 62.149447][ T7] [ 62.151777][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc1-syzkaller #0 [ 62.160001][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.170156][ T7] Workqueue: netns cleanup_net [ 62.174910][ T7] Call Trace: [ 62.178211][ T7] dump_stack+0x18f/0x20d [ 62.182542][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.188087][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.193631][ T7] ? afs_put_call+0xa40/0xa40 [ 62.198308][ T7] print_address_description.constprop.0.cold+0xd3/0x413 [ 62.205353][ T7] ? vprintk_func+0x97/0x1a6 [ 62.209946][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.215903][ T7] kasan_report.cold+0x1f/0x37 [ 62.220682][ T7] ? rcu_read_lock_held_common+0x51/0xa0 [ 62.226314][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.231857][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 62.237222][ T7] ? afs_close_socket+0x320/0x320 [ 62.242242][ T7] ? afs_put_call+0xa40/0xa40 [ 62.246915][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 62.252068][ T7] ? afs_put_call+0xa40/0xa40 [ 62.256748][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.263164][ T7] rxrpc_call_completed+0xca/0xf0 [ 62.268191][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 62.273572][ T7] ? lock_sock_nested+0x94/0x110 [ 62.278515][ T7] rxrpc_listen+0x147/0x360 [ 62.283030][ T7] afs_close_socket+0x95/0x320 [ 62.287799][ T7] ? afs_purge_servers+0x16d/0x300 [ 62.292909][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 62.298370][ T7] ? init_wait_var_entry+0x200/0x200 [ 62.303656][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.309310][ T7] ? check_preemption_disabled+0x38/0x220 [ 62.315383][ T7] afs_net_exit+0x1bc/0x310 [ 62.319886][ T7] ? afs_net_init+0xe30/0xe30 [ 62.324566][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 62.329698][ T7] cleanup_net+0x511/0xa50 [ 62.334118][ T7] ? unregister_pernet_device+0x70/0x70 [ 62.339671][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.345662][ T7] process_one_work+0x965/0x1690 [ 62.350616][ T7] ? lock_release+0x800/0x800 [ 62.355300][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.360779][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 62.365729][ T7] worker_thread+0x96/0xe10 [ 62.370334][ T7] ? process_one_work+0x1690/0x1690 [ 62.375571][ T7] kthread+0x3b5/0x4a0 [ 62.380242][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.385970][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.392218][ T7] ret_from_fork+0x1f/0x30 [ 62.396647][ T7] [ 62.398967][ T7] Allocated by task 6830: [ 62.403299][ T7] save_stack+0x1b/0x40 [ 62.407450][ T7] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 62.413086][ T7] kmem_cache_alloc_trace+0x153/0x7d0 [ 62.418450][ T7] afs_alloc_call+0x55/0x630 [ 62.423040][ T7] afs_charge_preallocation+0xe9/0x2d0 [ 62.428492][ T7] afs_open_socket+0x292/0x360 [ 62.433958][ T7] afs_net_init+0xa6c/0xe30 [ 62.438453][ T7] ops_init+0xaf/0x420 [ 62.442539][ T7] setup_net+0x2de/0x860 [ 62.446773][ T7] copy_net_ns+0x293/0x590 [ 62.451182][ T7] create_new_namespaces+0x3fb/0xb30 [ 62.456460][ T7] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 62.462089][ T7] ksys_unshare+0x43d/0x8e0 [ 62.466584][ T7] __x64_sys_unshare+0x2d/0x40 [ 62.471343][ T7] do_syscall_64+0x60/0xe0 [ 62.475754][ T7] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 62.481629][ T7] [ 62.483948][ T7] Freed by task 7: [ 62.488189][ T7] save_stack+0x1b/0x40 [ 62.492337][ T7] __kasan_slab_free+0xf7/0x140 [ 62.497268][ T7] kfree+0x109/0x2b0 [ 62.501155][ T7] afs_put_call+0x585/0xa40 [ 62.505678][ T7] rxrpc_discard_prealloc+0x764/0xab0 [ 62.511042][ T7] rxrpc_listen+0x147/0x360 [ 62.515544][ T7] afs_close_socket+0x95/0x320 [ 62.520298][ T7] afs_net_exit+0x1bc/0x310 [ 62.524797][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 62.529900][ T7] cleanup_net+0x511/0xa50 [ 62.534430][ T7] process_one_work+0x965/0x1690 [ 62.539357][ T7] worker_thread+0x96/0xe10 [ 62.543855][ T7] kthread+0x3b5/0x4a0 [ 62.547928][ T7] ret_from_fork+0x1f/0x30 [ 62.552346][ T7] [ 62.554696][ T7] The buggy address belongs to the object at ffff88809e411000 [ 62.554696][ T7] which belongs to the cache kmalloc-1k of size 1024 [ 62.568745][ T7] The buggy address is located 484 bytes inside of [ 62.568745][ T7] 1024-byte region [ffff88809e411000, ffff88809e411400) [ 62.582092][ T7] The buggy address belongs to the page: [ 62.587722][ T7] page:ffffea0002790440 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 62.596824][ T7] flags: 0xfffe0000000200(slab) [ 62.601711][ T7] raw: 00fffe0000000200 ffffea00029d1248 ffffea0002a3c988 ffff8880aa000c40 [ 62.610346][ T7] raw: 0000000000000000 ffff88809e411000 0000000100000002 0000000000000000 [ 62.619280][ T7] page dumped because: kasan: bad access detected [ 62.625679][ T7] [ 62.628010][ T7] Memory state around the buggy address: [ 62.633637][ T7] ffff88809e411080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.641693][ T7] ffff88809e411100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.649751][ T7] >ffff88809e411180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.657802][ T7] ^ [ 62.664990][ T7] ffff88809e411200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.673048][ T7] ffff88809e411280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.681096][ T7] ================================================================== [ 62.689142][ T7] Disabling lock debugging due to kernel taint [ 62.695355][ T7] Kernel panic - not syncing: panic_on_warn set ... [ 62.701944][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 62.711475][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.721538][ T7] Workqueue: netns cleanup_net [ 62.726300][ T7] Call Trace: [ 62.729605][ T7] dump_stack+0x18f/0x20d [ 62.733935][ T7] ? afs_wake_up_async_call+0x670/0x770 [ 62.739476][ T7] ? afs_put_call+0xa40/0xa40 [ 62.744150][ T7] panic+0x2e3/0x75c [ 62.748047][ T7] ? __warn_printk+0xf3/0xf3 [ 62.752662][ T7] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 62.758814][ T7] ? trace_hardirqs_on+0x55/0x220 [ 62.763834][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.769369][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.774902][ T7] ? afs_put_call+0xa40/0xa40 [ 62.779714][ T7] end_report+0x4d/0x53 [ 62.783870][ T7] kasan_report.cold+0xd/0x37 [ 62.788546][ T7] ? rcu_read_lock_held_common+0x51/0xa0 [ 62.794169][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.799705][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 62.805069][ T7] ? afs_close_socket+0x320/0x320 [ 62.810082][ T7] ? afs_put_call+0xa40/0xa40 [ 62.814749][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 62.819913][ T7] ? afs_put_call+0xa40/0xa40 [ 62.824582][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.830988][ T7] rxrpc_call_completed+0xca/0xf0 [ 62.836092][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 62.841547][ T7] ? lock_sock_nested+0x94/0x110 [ 62.846482][ T7] rxrpc_listen+0x147/0x360 [ 62.850977][ T7] afs_close_socket+0x95/0x320 [ 62.855730][ T7] ? afs_purge_servers+0x16d/0x300 [ 62.860835][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 62.866379][ T7] ? init_wait_var_entry+0x200/0x200 [ 62.871656][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.877305][ T7] ? check_preemption_disabled+0x38/0x220 [ 62.883014][ T7] afs_net_exit+0x1bc/0x310 [ 62.887513][ T7] ? afs_net_init+0xe30/0xe30 [ 62.892177][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 62.897286][ T7] cleanup_net+0x511/0xa50 [ 62.901701][ T7] ? unregister_pernet_device+0x70/0x70 [ 62.907374][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.913352][ T7] process_one_work+0x965/0x1690 [ 62.918291][ T7] ? lock_release+0x800/0x800 [ 62.922962][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.928432][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 62.933365][ T7] worker_thread+0x96/0xe10 [ 62.937868][ T7] ? process_one_work+0x1690/0x1690 [ 62.943085][ T7] kthread+0x3b5/0x4a0 [ 62.947145][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.952871][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.958583][ T7] ret_from_fork+0x1f/0x30 [ 62.964376][ T7] Kernel Offset: disabled [ 62.968691][ T7] Rebooting in 86400 seconds..