Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.244' (ECDSA) to the list of known hosts. 2020/06/19 06:42:20 fuzzer started 2020/06/19 06:42:20 connecting to host at 10.128.0.26:34063 2020/06/19 06:42:20 checking machine... 2020/06/19 06:42:20 checking revisions... 2020/06/19 06:42:20 testing simple program... syzkaller login: [ 62.850463][ T6856] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 06:42:21 building call list... [ 63.234507][ T21] tipc: TX() has been purged, node left! [ 63.747824][ T21] ================================================================== [ 63.756075][ T21] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 63.764302][ T21] Write of size 1 at addr ffff8880a25621e4 by task kworker/u4:1/21 [ 63.772633][ T21] [ 63.774971][ T21] CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.8.0-rc1-syzkaller #0 [ 63.783201][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.793259][ T21] Workqueue: netns cleanup_net [ 63.798110][ T21] Call Trace: [ 63.801407][ T21] dump_stack+0x18f/0x20d [ 63.805752][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.811295][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.818312][ T21] ? afs_put_call+0xa40/0xa40 [ 63.822994][ T21] print_address_description.constprop.0.cold+0xd3/0x413 [ 63.830030][ T21] ? vprintk_func+0x97/0x1a6 [ 63.834627][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.840258][ T21] kasan_report.cold+0x1f/0x37 [ 63.845026][ T21] ? rcu_read_lock_held_common+0x51/0xa0 [ 63.850654][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.856203][ T21] afs_wake_up_async_call+0x6aa/0x770 [ 63.861580][ T21] ? afs_close_socket+0x320/0x320 [ 63.866605][ T21] ? afs_put_call+0xa40/0xa40 [ 63.871433][ T21] rxrpc_notify_socket+0x1db/0x5d0 [ 63.876554][ T21] ? afs_put_call+0xa40/0xa40 [ 63.881230][ T21] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 63.887647][ T21] rxrpc_call_completed+0xca/0xf0 [ 63.892743][ T21] rxrpc_discard_prealloc+0x781/0xab0 [ 63.898641][ T21] ? lock_sock_nested+0x94/0x110 [ 63.903601][ T21] rxrpc_listen+0x147/0x360 [ 63.908105][ T21] afs_close_socket+0x95/0x320 [ 63.912883][ T21] ? afs_purge_servers+0x16d/0x300 [ 63.918096][ T21] ? afs_rx_discard_new_call+0x50/0x50 [ 63.923736][ T21] ? init_wait_var_entry+0x200/0x200 [ 63.929030][ T21] ? rcu_read_lock_held_common+0xa0/0xa0 [ 63.935548][ T21] ? check_preemption_disabled+0x38/0x220 [ 63.941365][ T21] afs_net_exit+0x1bc/0x310 [ 63.945865][ T21] ? afs_net_init+0xe30/0xe30 [ 63.950537][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 63.955836][ T21] cleanup_net+0x511/0xa50 [ 63.960254][ T21] ? unregister_pernet_device+0x70/0x70 [ 63.965833][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.971905][ T21] process_one_work+0x965/0x1690 [ 63.976852][ T21] ? lock_release+0x800/0x800 [ 63.981546][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 63.987016][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 63.991984][ T21] worker_thread+0x96/0xe10 [ 63.996501][ T21] ? process_one_work+0x1690/0x1690 [ 64.001714][ T21] kthread+0x3b5/0x4a0 [ 64.005789][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.011508][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.017713][ T21] ret_from_fork+0x1f/0x30 [ 64.022578][ T21] [ 64.024927][ T21] Allocated by task 6856: [ 64.029264][ T21] save_stack+0x1b/0x40 [ 64.033509][ T21] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 64.039315][ T21] kmem_cache_alloc_trace+0x153/0x7d0 [ 64.044687][ T21] afs_alloc_call+0x55/0x630 [ 64.049629][ T21] afs_charge_preallocation+0xe9/0x2d0 [ 64.055086][ T21] afs_open_socket+0x292/0x360 [ 64.059976][ T21] afs_net_init+0xa6c/0xe30 [ 64.064493][ T21] ops_init+0xaf/0x420 [ 64.068575][ T21] setup_net+0x2de/0x860 [ 64.072989][ T21] copy_net_ns+0x293/0x590 [ 64.077499][ T21] create_new_namespaces+0x3fb/0xb30 [ 64.082788][ T21] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 64.088515][ T21] ksys_unshare+0x43d/0x8e0 [ 64.093039][ T21] __ia32_sys_unshare+0x2c/0x40 [ 64.098232][ T21] do_syscall_32_irqs_on+0x3f/0x60 [ 64.103345][ T21] do_fast_syscall_32+0x7f/0x120 [ 64.108286][ T21] entry_SYSENTER_compat+0x6d/0x7c [ 64.113657][ T21] [ 64.116771][ T21] Freed by task 21: [ 64.120581][ T21] save_stack+0x1b/0x40 [ 64.124731][ T21] __kasan_slab_free+0xf7/0x140 [ 64.129660][ T21] kfree+0x109/0x2b0 [ 64.133641][ T21] afs_put_call+0x585/0xa40 [ 64.138502][ T21] rxrpc_discard_prealloc+0x764/0xab0 [ 64.143867][ T21] rxrpc_listen+0x147/0x360 [ 64.148478][ T21] afs_close_socket+0x95/0x320 [ 64.153512][ T21] afs_net_exit+0x1bc/0x310 [ 64.158098][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 64.163303][ T21] cleanup_net+0x511/0xa50 [ 64.167814][ T21] process_one_work+0x965/0x1690 [ 64.172864][ T21] worker_thread+0x96/0xe10 [ 64.177364][ T21] kthread+0x3b5/0x4a0 [ 64.181447][ T21] ret_from_fork+0x1f/0x30 [ 64.185936][ T21] [ 64.188287][ T21] The buggy address belongs to the object at ffff8880a2562000 [ 64.188287][ T21] which belongs to the cache kmalloc-1k of size 1024 [ 64.202791][ T21] The buggy address is located 484 bytes inside of [ 64.202791][ T21] 1024-byte region [ffff8880a2562000, ffff8880a2562400) [ 64.216330][ T21] The buggy address belongs to the page: [ 64.221980][ T21] page:ffffea0002895880 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 64.231180][ T21] flags: 0xfffe0000000200(slab) [ 64.236171][ T21] raw: 00fffe0000000200 ffffea00028dc108 ffffea0002888748 ffff8880aa000c40 [ 64.244758][ T21] raw: 0000000000000000 ffff8880a2562000 0000000100000002 0000000000000000 [ 64.253652][ T21] page dumped because: kasan: bad access detected [ 64.260057][ T21] [ 64.262463][ T21] Memory state around the buggy address: [ 64.268536][ T21] ffff8880a2562080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.276627][ T21] ffff8880a2562100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.284869][ T21] >ffff8880a2562180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.292922][ T21] ^ [ 64.300110][ T21] ffff8880a2562200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.308690][ T21] ffff8880a2562280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.316740][ T21] ================================================================== [ 64.324786][ T21] Disabling lock debugging due to kernel taint [ 64.331001][ T21] Kernel panic - not syncing: panic_on_warn set ... [ 64.337589][ T21] CPU: 1 PID: 21 Comm: kworker/u4:1 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 64.347296][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.357384][ T21] Workqueue: netns cleanup_net [ 64.362143][ T21] Call Trace: [ 64.365433][ T21] dump_stack+0x18f/0x20d [ 64.369766][ T21] ? afs_wake_up_async_call+0x670/0x770 [ 64.375325][ T21] ? afs_put_call+0xa40/0xa40 [ 64.380003][ T21] panic+0x2e3/0x75c [ 64.384002][ T21] ? __warn_printk+0xf3/0xf3 [ 64.388682][ T21] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 64.395137][ T21] ? trace_hardirqs_on+0x55/0x220 [ 64.400165][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.405793][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.411327][ T21] ? afs_put_call+0xa40/0xa40 [ 64.416096][ T21] end_report+0x4d/0x53 [ 64.420420][ T21] kasan_report.cold+0xd/0x37 [ 64.425093][ T21] ? rcu_read_lock_held_common+0x51/0xa0 [ 64.430716][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.436251][ T21] afs_wake_up_async_call+0x6aa/0x770 [ 64.441612][ T21] ? afs_close_socket+0x320/0x320 [ 64.446887][ T21] ? afs_put_call+0xa40/0xa40 [ 64.451564][ T21] rxrpc_notify_socket+0x1db/0x5d0 [ 64.456671][ T21] ? afs_put_call+0xa40/0xa40 [ 64.461445][ T21] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 64.467850][ T21] rxrpc_call_completed+0xca/0xf0 [ 64.473262][ T21] rxrpc_discard_prealloc+0x781/0xab0 [ 64.478640][ T21] ? lock_sock_nested+0x94/0x110 [ 64.483571][ T21] rxrpc_listen+0x147/0x360 [ 64.488158][ T21] afs_close_socket+0x95/0x320 [ 64.492914][ T21] ? afs_purge_servers+0x16d/0x300 [ 64.498019][ T21] ? afs_rx_discard_new_call+0x50/0x50 [ 64.503914][ T21] ? init_wait_var_entry+0x200/0x200 [ 64.510163][ T21] ? rcu_read_lock_held_common+0xa0/0xa0 [ 64.515981][ T21] ? check_preemption_disabled+0x38/0x220 [ 64.521874][ T21] afs_net_exit+0x1bc/0x310 [ 64.526375][ T21] ? afs_net_init+0xe30/0xe30 [ 64.531053][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 64.536157][ T21] cleanup_net+0x511/0xa50 [ 64.540666][ T21] ? unregister_pernet_device+0x70/0x70 [ 64.546377][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.552452][ T21] process_one_work+0x965/0x1690 [ 64.557391][ T21] ? lock_release+0x800/0x800 [ 64.562066][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 64.567460][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 64.572514][ T21] worker_thread+0x96/0xe10 [ 64.577485][ T21] ? process_one_work+0x1690/0x1690 [ 64.582775][ T21] kthread+0x3b5/0x4a0 [ 64.586842][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.592586][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.598652][ T21] ret_from_fork+0x1f/0x30 [ 64.604792][ T21] Kernel Offset: disabled [ 64.609144][ T21] Rebooting in 86400 seconds..