Warning: Permanently added '10.128.0.50' (ECDSA) to the list of known hosts. 2020/06/17 06:06:04 fuzzer started 2020/06/17 06:06:04 connecting to host at 10.128.0.26:39691 2020/06/17 06:06:04 checking machine... 2020/06/17 06:06:04 checking revisions... 2020/06/17 06:06:04 testing simple program... syzkaller login: [ 63.767201][ T6821] IPVS: ftp: loaded support on port[0] = 21 2020/06/17 06:06:05 building call list... [ 64.131473][ T262] tipc: TX() has been purged, node left! [ 64.633680][ T262] ================================================================== [ 64.641921][ T262] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 64.650000][ T262] Write of size 1 at addr ffff888096b199e4 by task kworker/u4:6/262 [ 64.658239][ T262] [ 64.660670][ T262] CPU: 1 PID: 262 Comm: kworker/u4:6 Not tainted 5.8.0-rc1-syzkaller #0 [ 64.669015][ T262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.679169][ T262] Workqueue: netns cleanup_net [ 64.684975][ T262] Call Trace: [ 64.688269][ T262] dump_stack+0x18f/0x20d [ 64.692602][ T262] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.698157][ T262] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.703986][ T262] ? afs_put_call+0xa40/0xa40 [ 64.708695][ T262] print_address_description.constprop.0.cold+0xd3/0x413 [ 64.715816][ T262] ? vprintk_func+0x97/0x1a6 [ 64.720431][ T262] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.727198][ T262] kasan_report.cold+0x1f/0x37 [ 64.732314][ T262] ? rcu_read_lock_held_common+0x51/0xa0 [ 64.737970][ T262] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.743771][ T262] afs_wake_up_async_call+0x6aa/0x770 [ 64.749245][ T262] ? afs_close_socket+0x320/0x320 [ 64.754280][ T262] ? afs_put_call+0xa40/0xa40 [ 64.758971][ T262] rxrpc_notify_socket+0x1db/0x5d0 [ 64.764096][ T262] ? afs_put_call+0xa40/0xa40 [ 64.768773][ T262] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 64.775206][ T262] rxrpc_call_completed+0xca/0xf0 [ 64.780243][ T262] rxrpc_discard_prealloc+0x781/0xab0 [ 64.785619][ T262] ? lock_sock_nested+0x94/0x110 [ 64.790562][ T262] rxrpc_listen+0x147/0x360 [ 64.795090][ T262] afs_close_socket+0x95/0x320 [ 64.799853][ T262] ? afs_purge_servers+0x16d/0x300 [ 64.804979][ T262] ? afs_rx_discard_new_call+0x50/0x50 [ 64.810444][ T262] ? init_wait_var_entry+0x200/0x200 [ 64.815734][ T262] ? rcu_read_lock_held_common+0xa0/0xa0 [ 64.821525][ T262] ? check_preemption_disabled+0x38/0x220 [ 64.827264][ T262] afs_net_exit+0x1bc/0x310 [ 64.831770][ T262] ? afs_net_init+0xe30/0xe30 [ 64.836450][ T262] ops_exit_list.isra.0+0xa8/0x150 [ 64.841584][ T262] cleanup_net+0x511/0xa50 [ 64.846017][ T262] ? unregister_pernet_device+0x70/0x70 [ 64.851565][ T262] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.857552][ T262] process_one_work+0x965/0x1690 [ 64.862588][ T262] ? lock_release+0x800/0x800 [ 64.867462][ T262] ? pwq_dec_nr_in_flight+0x310/0x310 [ 64.872838][ T262] ? rwlock_bug.part.0+0x90/0x90 [ 64.877794][ T262] worker_thread+0x96/0xe10 [ 64.882315][ T262] ? process_one_work+0x1690/0x1690 [ 64.887518][ T262] kthread+0x3b5/0x4a0 [ 64.891672][ T262] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.897410][ T262] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.903152][ T262] ret_from_fork+0x1f/0x30 [ 64.907583][ T262] [ 64.909917][ T262] Allocated by task 6821: [ 64.914248][ T262] save_stack+0x1b/0x40 [ 64.918403][ T262] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 64.924044][ T262] kmem_cache_alloc_trace+0x153/0x7d0 [ 64.929422][ T262] afs_alloc_call+0x55/0x630 [ 64.934016][ T262] afs_charge_preallocation+0xe9/0x2d0 [ 64.939471][ T262] afs_open_socket+0x292/0x360 [ 64.944230][ T262] afs_net_init+0xa6c/0xe30 [ 64.948749][ T262] ops_init+0xaf/0x420 [ 64.952986][ T262] setup_net+0x2de/0x860 [ 64.958872][ T262] copy_net_ns+0x293/0x590 [ 64.963297][ T262] create_new_namespaces+0x3fb/0xb30 [ 64.968582][ T262] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 64.974214][ T262] ksys_unshare+0x43d/0x8e0 [ 64.978712][ T262] __x64_sys_unshare+0x2d/0x40 [ 64.983470][ T262] do_syscall_64+0x60/0xe0 [ 64.987886][ T262] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.993763][ T262] [ 64.996083][ T262] Freed by task 262: [ 64.999975][ T262] save_stack+0x1b/0x40 [ 65.004127][ T262] __kasan_slab_free+0xf7/0x140 [ 65.008970][ T262] kfree+0x109/0x2b0 [ 65.012879][ T262] afs_put_call+0x585/0xa40 [ 65.017379][ T262] rxrpc_discard_prealloc+0x764/0xab0 [ 65.022761][ T262] rxrpc_listen+0x147/0x360 [ 65.027262][ T262] afs_close_socket+0x95/0x320 [ 65.032031][ T262] afs_net_exit+0x1bc/0x310 [ 65.036544][ T262] ops_exit_list.isra.0+0xa8/0x150 [ 65.041666][ T262] cleanup_net+0x511/0xa50 [ 65.046102][ T262] process_one_work+0x965/0x1690 [ 65.051130][ T262] worker_thread+0x96/0xe10 [ 65.055638][ T262] kthread+0x3b5/0x4a0 [ 65.059718][ T262] ret_from_fork+0x1f/0x30 [ 65.064122][ T262] [ 65.066449][ T262] The buggy address belongs to the object at ffff888096b19800 [ 65.066449][ T262] which belongs to the cache kmalloc-1k of size 1024 [ 65.081194][ T262] The buggy address is located 484 bytes inside of [ 65.081194][ T262] 1024-byte region [ffff888096b19800, ffff888096b19c00) [ 65.094555][ T262] The buggy address belongs to the page: [ 65.100200][ T262] page:ffffea00025ac640 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 65.109385][ T262] flags: 0xfffe0000000200(slab) [ 65.114238][ T262] raw: 00fffe0000000200 ffffea00025df7c8 ffffea000261efc8 ffff8880aa000c40 [ 65.122821][ T262] raw: 0000000000000000 ffff888096b19000 0000000100000002 0000000000000000 [ 65.131652][ T262] page dumped because: kasan: bad access detected [ 65.138052][ T262] [ 65.140371][ T262] Memory state around the buggy address: [ 65.146085][ T262] ffff888096b19880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.154155][ T262] ffff888096b19900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.162214][ T262] >ffff888096b19980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.170276][ T262] ^ [ 65.177464][ T262] ffff888096b19a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.185618][ T262] ffff888096b19a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.193668][ T262] ================================================================== [ 65.201718][ T262] Disabling lock debugging due to kernel taint [ 65.209158][ T262] Kernel panic - not syncing: panic_on_warn set ... [ 65.215755][ T262] CPU: 1 PID: 262 Comm: kworker/u4:6 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 65.225470][ T262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.236572][ T262] Workqueue: netns cleanup_net [ 65.241338][ T262] Call Trace: [ 65.244632][ T262] dump_stack+0x18f/0x20d [ 65.248988][ T262] ? afs_wake_up_async_call+0x670/0x770 [ 65.254538][ T262] ? afs_put_call+0xa40/0xa40 [ 65.259258][ T262] panic+0x2e3/0x75c [ 65.263183][ T262] ? __warn_printk+0xf3/0xf3 [ 65.267855][ T262] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 65.274013][ T262] ? trace_hardirqs_on+0x55/0x220 [ 65.279035][ T262] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.284581][ T262] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.290118][ T262] ? afs_put_call+0xa40/0xa40 [ 65.294788][ T262] end_report+0x4d/0x53 [ 65.298941][ T262] kasan_report.cold+0xd/0x37 [ 65.303631][ T262] ? rcu_read_lock_held_common+0x51/0xa0 [ 65.309603][ T262] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.315144][ T262] afs_wake_up_async_call+0x6aa/0x770 [ 65.320511][ T262] ? afs_close_socket+0x320/0x320 [ 65.325614][ T262] ? afs_put_call+0xa40/0xa40 [ 65.330285][ T262] rxrpc_notify_socket+0x1db/0x5d0 [ 65.335395][ T262] ? afs_put_call+0xa40/0xa40 [ 65.340066][ T262] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 65.346472][ T262] rxrpc_call_completed+0xca/0xf0 [ 65.351663][ T262] rxrpc_discard_prealloc+0x781/0xab0 [ 65.357117][ T262] ? lock_sock_nested+0x94/0x110 [ 65.362048][ T262] rxrpc_listen+0x147/0x360 [ 65.366551][ T262] afs_close_socket+0x95/0x320 [ 65.371311][ T262] ? afs_purge_servers+0x16d/0x300 [ 65.376412][ T262] ? afs_rx_discard_new_call+0x50/0x50 [ 65.381875][ T262] ? init_wait_var_entry+0x200/0x200 [ 65.387160][ T262] ? rcu_read_lock_held_common+0xa0/0xa0 [ 65.392790][ T262] ? check_preemption_disabled+0x38/0x220 [ 65.398501][ T262] afs_net_exit+0x1bc/0x310 [ 65.402998][ T262] ? afs_net_init+0xe30/0xe30 [ 65.407664][ T262] ops_exit_list.isra.0+0xa8/0x150 [ 65.412768][ T262] cleanup_net+0x511/0xa50 [ 65.418571][ T262] ? unregister_pernet_device+0x70/0x70 [ 65.424199][ T262] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.430174][ T262] process_one_work+0x965/0x1690 [ 65.435113][ T262] ? lock_release+0x800/0x800 [ 65.439785][ T262] ? pwq_dec_nr_in_flight+0x310/0x310 [ 65.445169][ T262] ? rwlock_bug.part.0+0x90/0x90 [ 65.450110][ T262] worker_thread+0x96/0xe10 [ 65.455134][ T262] ? process_one_work+0x1690/0x1690 [ 65.461281][ T262] kthread+0x3b5/0x4a0 [ 65.465348][ T262] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.471058][ T262] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.476792][ T262] ret_from_fork+0x1f/0x30 [ 65.482762][ T262] Kernel Offset: disabled [ 65.488580][ T262] Rebooting in 86400 seconds..