Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.200' (ECDSA) to the list of known hosts. 2020/06/19 08:21:05 fuzzer started 2020/06/19 08:21:06 connecting to host at 10.128.0.26:44707 2020/06/19 08:21:06 checking machine... 2020/06/19 08:21:06 checking revisions... 2020/06/19 08:21:06 testing simple program... syzkaller login: [ 60.760185][ T6855] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 08:21:06 building call list... [ 61.086620][ T26] tipc: TX() has been purged, node left! [ 61.588501][ T26] ================================================================== [ 61.596750][ T26] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 61.604895][ T26] Write of size 1 at addr ffff88809d9b51e4 by task kworker/u4:2/26 [ 61.612779][ T26] [ 61.615116][ T26] CPU: 0 PID: 26 Comm: kworker/u4:2 Not tainted 5.8.0-rc1-syzkaller #0 [ 61.623872][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.633950][ T26] Workqueue: netns cleanup_net [ 61.638707][ T26] Call Trace: [ 61.642005][ T26] dump_stack+0x18f/0x20d [ 61.646372][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.651916][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.657464][ T26] ? afs_put_call+0xa40/0xa40 [ 61.662161][ T26] print_address_description.constprop.0.cold+0xd3/0x413 [ 61.669278][ T26] ? vprintk_func+0x97/0x1a6 [ 61.673872][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.679421][ T26] kasan_report.cold+0x1f/0x37 [ 61.684302][ T26] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.689931][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.695480][ T26] afs_wake_up_async_call+0x6aa/0x770 [ 61.701485][ T26] ? afs_close_socket+0x320/0x320 [ 61.706829][ T26] ? afs_put_call+0xa40/0xa40 [ 61.711526][ T26] rxrpc_notify_socket+0x1db/0x5d0 [ 61.716648][ T26] ? afs_put_call+0xa40/0xa40 [ 61.721326][ T26] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.727747][ T26] rxrpc_call_completed+0xca/0xf0 [ 61.732805][ T26] rxrpc_discard_prealloc+0x781/0xab0 [ 61.738180][ T26] ? lock_sock_nested+0x94/0x110 [ 61.743122][ T26] rxrpc_listen+0x147/0x360 [ 61.747628][ T26] afs_close_socket+0x95/0x320 [ 61.752393][ T26] ? afs_purge_servers+0x16d/0x300 [ 61.757507][ T26] ? afs_rx_discard_new_call+0x50/0x50 [ 61.762976][ T26] ? init_wait_var_entry+0x200/0x200 [ 61.768288][ T26] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.773944][ T26] ? check_preemption_disabled+0x38/0x220 [ 61.779755][ T26] afs_net_exit+0x1bc/0x310 [ 61.784255][ T26] ? afs_net_init+0xe30/0xe30 [ 61.788933][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 61.794050][ T26] cleanup_net+0x511/0xa50 [ 61.798470][ T26] ? unregister_pernet_device+0x70/0x70 [ 61.804107][ T26] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.810100][ T26] process_one_work+0x965/0x1690 [ 61.815051][ T26] ? lock_release+0x800/0x800 [ 61.819731][ T26] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.825106][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 61.830055][ T26] worker_thread+0x96/0xe10 [ 61.834610][ T26] ? process_one_work+0x1690/0x1690 [ 61.839899][ T26] kthread+0x3b5/0x4a0 [ 61.843965][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.849677][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.855402][ T26] ret_from_fork+0x1f/0x30 [ 61.859825][ T26] [ 61.862147][ T26] Allocated by task 6855: [ 61.866475][ T26] save_stack+0x1b/0x40 [ 61.870649][ T26] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 61.876275][ T26] kmem_cache_alloc_trace+0x153/0x7d0 [ 61.881641][ T26] afs_alloc_call+0x55/0x630 [ 61.886225][ T26] afs_charge_preallocation+0xe9/0x2d0 [ 61.891675][ T26] afs_open_socket+0x292/0x360 [ 61.896438][ T26] afs_net_init+0xa6c/0xe30 [ 61.900933][ T26] ops_init+0xaf/0x420 [ 61.905012][ T26] setup_net+0x2de/0x860 [ 61.909249][ T26] copy_net_ns+0x293/0x590 [ 61.913659][ T26] create_new_namespaces+0x3fb/0xb30 [ 61.918944][ T26] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 61.924582][ T26] ksys_unshare+0x43d/0x8e0 [ 61.929081][ T26] __x64_sys_unshare+0x2d/0x40 [ 61.933840][ T26] do_syscall_64+0x60/0xe0 [ 61.938261][ T26] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.944138][ T26] [ 61.946463][ T26] Freed by task 26: [ 61.950270][ T26] save_stack+0x1b/0x40 [ 61.954603][ T26] __kasan_slab_free+0xf7/0x140 [ 61.959446][ T26] kfree+0x109/0x2b0 [ 61.963335][ T26] afs_put_call+0x585/0xa40 [ 61.967835][ T26] rxrpc_discard_prealloc+0x764/0xab0 [ 61.973292][ T26] rxrpc_listen+0x147/0x360 [ 61.977840][ T26] afs_close_socket+0x95/0x320 [ 61.982595][ T26] afs_net_exit+0x1bc/0x310 [ 61.988188][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 61.993292][ T26] cleanup_net+0x511/0xa50 [ 61.997706][ T26] process_one_work+0x965/0x1690 [ 62.002638][ T26] worker_thread+0x96/0xe10 [ 62.007923][ T26] kthread+0x3b5/0x4a0 [ 62.011986][ T26] ret_from_fork+0x1f/0x30 [ 62.016386][ T26] [ 62.018712][ T26] The buggy address belongs to the object at ffff88809d9b5000 [ 62.018712][ T26] which belongs to the cache kmalloc-1k of size 1024 [ 62.032794][ T26] The buggy address is located 484 bytes inside of [ 62.032794][ T26] 1024-byte region [ffff88809d9b5000, ffff88809d9b5400) [ 62.046162][ T26] The buggy address belongs to the page: [ 62.051804][ T26] page:ffffea0002766d40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 62.060926][ T26] flags: 0xfffe0000000200(slab) [ 62.065956][ T26] raw: 00fffe0000000200 ffffea00029b8b48 ffffea0002877dc8 ffff8880aa000c40 [ 62.075172][ T26] raw: 0000000000000000 ffff88809d9b5000 0000000100000002 0000000000000000 [ 62.083762][ T26] page dumped because: kasan: bad access detected [ 62.090176][ T26] [ 62.092517][ T26] Memory state around the buggy address: [ 62.098151][ T26] ffff88809d9b5080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.106216][ T26] ffff88809d9b5100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.114282][ T26] >ffff88809d9b5180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.122335][ T26] ^ [ 62.129532][ T26] ffff88809d9b5200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.137591][ T26] ffff88809d9b5280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.145644][ T26] ================================================================== [ 62.153694][ T26] Disabling lock debugging due to kernel taint [ 62.160351][ T26] Kernel panic - not syncing: panic_on_warn set ... [ 62.166948][ T26] CPU: 0 PID: 26 Comm: kworker/u4:2 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 62.176561][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.186687][ T26] Workqueue: netns cleanup_net [ 62.191443][ T26] Call Trace: [ 62.194733][ T26] dump_stack+0x18f/0x20d [ 62.199069][ T26] ? afs_wake_up_async_call+0x670/0x770 [ 62.204884][ T26] ? afs_put_call+0xa40/0xa40 [ 62.209559][ T26] panic+0x2e3/0x75c [ 62.213544][ T26] ? __warn_printk+0xf3/0xf3 [ 62.218141][ T26] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 62.225691][ T26] ? trace_hardirqs_on+0x55/0x220 [ 62.231421][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.237142][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.242714][ T26] ? afs_put_call+0xa40/0xa40 [ 62.247397][ T26] end_report+0x4d/0x53 [ 62.252087][ T26] kasan_report.cold+0xd/0x37 [ 62.256771][ T26] ? rcu_read_lock_held_common+0x51/0xa0 [ 62.262492][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.268036][ T26] afs_wake_up_async_call+0x6aa/0x770 [ 62.273409][ T26] ? afs_close_socket+0x320/0x320 [ 62.278451][ T26] ? afs_put_call+0xa40/0xa40 [ 62.283126][ T26] rxrpc_notify_socket+0x1db/0x5d0 [ 62.288239][ T26] ? afs_put_call+0xa40/0xa40 [ 62.292914][ T26] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.299326][ T26] rxrpc_call_completed+0xca/0xf0 [ 62.304404][ T26] rxrpc_discard_prealloc+0x781/0xab0 [ 62.309776][ T26] ? lock_sock_nested+0x94/0x110 [ 62.314725][ T26] rxrpc_listen+0x147/0x360 [ 62.319325][ T26] afs_close_socket+0x95/0x320 [ 62.324091][ T26] ? afs_purge_servers+0x16d/0x300 [ 62.329465][ T26] ? afs_rx_discard_new_call+0x50/0x50 [ 62.335095][ T26] ? init_wait_var_entry+0x200/0x200 [ 62.340381][ T26] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.346006][ T26] ? check_preemption_disabled+0x38/0x220 [ 62.351804][ T26] afs_net_exit+0x1bc/0x310 [ 62.356385][ T26] ? afs_net_init+0xe30/0xe30 [ 62.361054][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 62.366329][ T26] cleanup_net+0x511/0xa50 [ 62.370741][ T26] ? unregister_pernet_device+0x70/0x70 [ 62.376281][ T26] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.382262][ T26] process_one_work+0x965/0x1690 [ 62.387197][ T26] ? lock_release+0x800/0x800 [ 62.391866][ T26] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.397230][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 62.402160][ T26] worker_thread+0x96/0xe10 [ 62.406662][ T26] ? process_one_work+0x1690/0x1690 [ 62.411850][ T26] kthread+0x3b5/0x4a0 [ 62.415914][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.421748][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.427464][ T26] ret_from_fork+0x1f/0x30 [ 62.433415][ T26] Kernel Offset: disabled [ 62.437867][ T26] Rebooting in 86400 seconds..