Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.209' (ECDSA) to the list of known hosts. 2020/06/19 02:20:10 fuzzer started 2020/06/19 02:20:10 connecting to host at 10.128.0.26:34659 2020/06/19 02:20:10 checking machine... 2020/06/19 02:20:10 checking revisions... 2020/06/19 02:20:10 testing simple program... syzkaller login: [ 68.395400][ T6845] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 02:20:11 building call list... [ 68.684134][ T43] tipc: TX() has been purged, node left! [ 69.206468][ T43] ================================================================== [ 69.215250][ T43] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 69.223225][ T43] Write of size 1 at addr ffff88809fe0f1e4 by task kworker/u4:3/43 [ 69.231327][ T43] [ 69.233931][ T43] CPU: 1 PID: 43 Comm: kworker/u4:3 Not tainted 5.8.0-rc1-syzkaller #0 [ 69.242340][ T43] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.252914][ T43] Workqueue: netns cleanup_net [ 69.257682][ T43] Call Trace: [ 69.261050][ T43] dump_stack+0x18f/0x20d [ 69.265393][ T43] ? afs_wake_up_async_call+0x6aa/0x770 [ 69.271031][ T43] ? afs_wake_up_async_call+0x6aa/0x770 [ 69.276579][ T43] ? afs_put_call+0xa40/0xa40 [ 69.281269][ T43] print_address_description.constprop.0.cold+0xd3/0x413 [ 69.291010][ T43] ? vprintk_func+0x97/0x1a6 [ 69.295703][ T43] ? afs_wake_up_async_call+0x6aa/0x770 [ 69.301692][ T43] kasan_report.cold+0x1f/0x37 [ 69.306559][ T43] ? rcu_read_lock_held_common+0x51/0xa0 [ 69.312198][ T43] ? afs_wake_up_async_call+0x6aa/0x770 [ 69.317944][ T43] afs_wake_up_async_call+0x6aa/0x770 [ 69.323318][ T43] ? afs_close_socket+0x320/0x320 [ 69.328352][ T43] ? afs_put_call+0xa40/0xa40 [ 69.333132][ T43] rxrpc_notify_socket+0x1db/0x5d0 [ 69.338589][ T43] ? afs_put_call+0xa40/0xa40 [ 69.343283][ T43] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 69.350135][ T43] rxrpc_call_completed+0xca/0xf0 [ 69.355679][ T43] rxrpc_discard_prealloc+0x781/0xab0 [ 69.361072][ T43] ? lock_sock_nested+0x94/0x110 [ 69.366022][ T43] rxrpc_listen+0x147/0x360 [ 69.370551][ T43] afs_close_socket+0x95/0x320 [ 69.375436][ T43] ? afs_purge_servers+0x16d/0x300 [ 69.381627][ T43] ? afs_rx_discard_new_call+0x50/0x50 [ 69.387193][ T43] ? init_wait_var_entry+0x200/0x200 [ 69.392495][ T43] ? rcu_read_lock_held_common+0xa0/0xa0 [ 69.400366][ T43] ? check_preemption_disabled+0x38/0x220 [ 69.406104][ T43] afs_net_exit+0x1bc/0x310 [ 69.410618][ T43] ? afs_net_init+0xe30/0xe30 [ 69.415304][ T43] ops_exit_list.isra.0+0xa8/0x150 [ 69.420516][ T43] cleanup_net+0x511/0xa50 [ 69.424951][ T43] ? unregister_pernet_device+0x70/0x70 [ 69.430817][ T43] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 69.437941][ T43] process_one_work+0x965/0x1690 [ 69.443136][ T43] ? lock_release+0x800/0x800 [ 69.447911][ T43] ? pwq_dec_nr_in_flight+0x310/0x310 [ 69.453510][ T43] ? rwlock_bug.part.0+0x90/0x90 [ 69.458715][ T43] worker_thread+0x96/0xe10 [ 69.463465][ T43] ? process_one_work+0x1690/0x1690 [ 69.468730][ T43] kthread+0x3b5/0x4a0 [ 69.472901][ T43] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 69.478828][ T43] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 69.485154][ T43] ret_from_fork+0x1f/0x30 [ 69.489956][ T43] [ 69.492515][ T43] Allocated by task 6845: [ 69.497211][ T43] save_stack+0x1b/0x40 [ 69.501986][ T43] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 69.507862][ T43] kmem_cache_alloc_trace+0x153/0x7d0 [ 69.513429][ T43] afs_alloc_call+0x55/0x630 [ 69.518506][ T43] afs_charge_preallocation+0xe9/0x2d0 [ 69.524406][ T43] afs_open_socket+0x292/0x360 [ 69.529193][ T43] afs_net_init+0xa6c/0xe30 [ 69.533798][ T43] ops_init+0xaf/0x420 [ 69.539173][ T43] setup_net+0x2de/0x860 [ 69.543852][ T43] copy_net_ns+0x293/0x590 [ 69.548615][ T43] create_new_namespaces+0x3fb/0xb30 [ 69.553916][ T43] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 69.559645][ T43] ksys_unshare+0x43d/0x8e0 [ 69.564208][ T43] __x64_sys_unshare+0x2d/0x40 [ 69.568998][ T43] do_syscall_64+0x60/0xe0 [ 69.573436][ T43] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 69.579330][ T43] [ 69.581785][ T43] Freed by task 43: [ 69.585861][ T43] save_stack+0x1b/0x40 [ 69.590165][ T43] __kasan_slab_free+0xf7/0x140 [ 69.595105][ T43] kfree+0x109/0x2b0 [ 69.599145][ T43] afs_put_call+0x585/0xa40 [ 69.603809][ T43] rxrpc_discard_prealloc+0x764/0xab0 [ 69.609289][ T43] rxrpc_listen+0x147/0x360 [ 69.613802][ T43] afs_close_socket+0x95/0x320 [ 69.618928][ T43] afs_net_exit+0x1bc/0x310 [ 69.623441][ T43] ops_exit_list.isra.0+0xa8/0x150 [ 69.628754][ T43] cleanup_net+0x511/0xa50 [ 69.633280][ T43] process_one_work+0x965/0x1690 [ 69.638359][ T43] worker_thread+0x96/0xe10 [ 69.642873][ T43] kthread+0x3b5/0x4a0 [ 69.646948][ T43] ret_from_fork+0x1f/0x30 [ 69.651444][ T43] [ 69.653781][ T43] The buggy address belongs to the object at ffff88809fe0f000 [ 69.653781][ T43] which belongs to the cache kmalloc-1k of size 1024 [ 69.668568][ T43] The buggy address is located 484 bytes inside of [ 69.668568][ T43] 1024-byte region [ffff88809fe0f000, ffff88809fe0f400) [ 69.682832][ T43] The buggy address belongs to the page: [ 69.689256][ T43] page:ffffea00027f83c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 69.698999][ T43] flags: 0xfffe0000000200(slab) [ 69.704196][ T43] raw: 00fffe0000000200 ffffea00025465c8 ffffea00029d8588 ffff8880aa000c40 [ 69.715131][ T43] raw: 0000000000000000 ffff88809fe0f000 0000000100000002 0000000000000000 [ 69.724500][ T43] page dumped because: kasan: bad access detected [ 69.731183][ T43] [ 69.733873][ T43] Memory state around the buggy address: [ 69.740510][ T43] ffff88809fe0f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 69.749298][ T43] ffff88809fe0f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 69.758127][ T43] >ffff88809fe0f180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 69.767733][ T43] ^ [ 69.775237][ T43] ffff88809fe0f200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 69.783551][ T43] ffff88809fe0f280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 69.793385][ T43] ================================================================== [ 69.802689][ T43] Disabling lock debugging due to kernel taint [ 69.810153][ T43] Kernel panic - not syncing: panic_on_warn set ... [ 69.816959][ T43] CPU: 1 PID: 43 Comm: kworker/u4:3 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 69.827277][ T43] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.838151][ T43] Workqueue: netns cleanup_net [ 69.843569][ T43] Call Trace: [ 69.847511][ T43] dump_stack+0x18f/0x20d [ 69.852373][ T43] ? afs_wake_up_async_call+0x680/0x770 [ 69.858457][ T43] ? afs_put_call+0xa40/0xa40 [ 69.864069][ T43] panic+0x2e3/0x75c [ 69.868735][ T43] ? __warn_printk+0xf3/0xf3 [ 69.873530][ T43] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 69.880936][ T43] ? trace_hardirqs_on+0x55/0x220 [ 69.886353][ T43] ? afs_wake_up_async_call+0x6aa/0x770 [ 69.892433][ T43] ? afs_wake_up_async_call+0x6aa/0x770 [ 69.898513][ T43] ? afs_put_call+0xa40/0xa40 [ 69.903752][ T43] end_report+0x4d/0x53 [ 69.908378][ T43] kasan_report.cold+0xd/0x37 [ 69.913794][ T43] ? rcu_read_lock_held_common+0x51/0xa0 [ 69.919902][ T43] ? afs_wake_up_async_call+0x6aa/0x770 [ 69.926458][ T43] afs_wake_up_async_call+0x6aa/0x770 [ 69.932025][ T43] ? afs_close_socket+0x320/0x320 [ 69.937494][ T43] ? afs_put_call+0xa40/0xa40 [ 69.942418][ T43] rxrpc_notify_socket+0x1db/0x5d0 [ 69.947942][ T43] ? afs_put_call+0xa40/0xa40 [ 69.953353][ T43] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 69.960504][ T43] rxrpc_call_completed+0xca/0xf0 [ 69.967834][ T43] rxrpc_discard_prealloc+0x781/0xab0 [ 69.973864][ T43] ? lock_sock_nested+0x94/0x110 [ 69.978815][ T43] rxrpc_listen+0x147/0x360 [ 69.984038][ T43] afs_close_socket+0x95/0x320 [ 69.990152][ T43] ? afs_purge_servers+0x16d/0x300 [ 69.995382][ T43] ? afs_rx_discard_new_call+0x50/0x50 [ 70.001010][ T43] ? init_wait_var_entry+0x200/0x200 [ 70.006650][ T43] ? rcu_read_lock_held_common+0xa0/0xa0 [ 70.013148][ T43] ? check_preemption_disabled+0x38/0x220 [ 70.019265][ T43] afs_net_exit+0x1bc/0x310 [ 70.023955][ T43] ? afs_net_init+0xe30/0xe30 [ 70.029672][ T43] ops_exit_list.isra.0+0xa8/0x150 [ 70.035059][ T43] cleanup_net+0x511/0xa50 [ 70.040089][ T43] ? unregister_pernet_device+0x70/0x70 [ 70.046317][ T43] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 70.053151][ T43] process_one_work+0x965/0x1690 [ 70.059421][ T43] ? lock_release+0x800/0x800 [ 70.064418][ T43] ? pwq_dec_nr_in_flight+0x310/0x310 [ 70.069996][ T43] ? rwlock_bug.part.0+0x90/0x90 [ 70.076556][ T43] worker_thread+0x96/0xe10 [ 70.081716][ T43] ? process_one_work+0x1690/0x1690 [ 70.087152][ T43] kthread+0x3b5/0x4a0 [ 70.091247][ T43] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 70.097195][ T43] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 70.103122][ T43] ret_from_fork+0x1f/0x30 [ 70.109513][ T43] Kernel Offset: disabled [ 70.114050][ T43] Rebooting in 86400 seconds..