[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.33' (ECDSA) to the list of known hosts. 2020/06/15 05:57:22 fuzzer started 2020/06/15 05:57:23 connecting to host at 10.128.0.26:37049 2020/06/15 05:57:23 checking machine... 2020/06/15 05:57:23 checking revisions... 2020/06/15 05:57:23 testing simple program... syzkaller login: [ 60.574984][ T6821] IPVS: ftp: loaded support on port[0] = 21 2020/06/15 05:57:23 building call list... [ 60.933696][ T25] tipc: TX() has been purged, node left! [ 61.435966][ T25] ================================================================== [ 61.444214][ T25] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 61.452109][ T25] Write of size 1 at addr ffff8880946bf1e4 by task kworker/u4:2/25 [ 61.460004][ T25] [ 61.462366][ T25] CPU: 0 PID: 25 Comm: kworker/u4:2 Not tainted 5.8.0-rc1-next-20200615-syzkaller #0 [ 61.471816][ T25] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.481878][ T25] Workqueue: netns cleanup_net [ 61.486636][ T25] Call Trace: [ 61.489941][ T25] dump_stack+0x18f/0x20d [ 61.494303][ T25] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.499850][ T25] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.505394][ T25] ? afs_put_call+0xa40/0xa40 [ 61.510094][ T25] print_address_description.constprop.0.cold+0xd3/0x413 [ 61.517133][ T25] ? vprintk_func+0x97/0x1a6 [ 61.521733][ T25] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.527295][ T25] kasan_report.cold+0x1f/0x37 [ 61.532067][ T25] ? rcu_read_lock_held_common+0x71/0xa0 [ 61.537698][ T25] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.543257][ T25] afs_wake_up_async_call+0x6aa/0x770 [ 61.548715][ T25] ? afs_close_socket+0x320/0x320 [ 61.553738][ T25] ? afs_put_call+0xa40/0xa40 [ 61.558424][ T25] rxrpc_notify_socket+0x1db/0x5d0 [ 61.563558][ T25] ? afs_put_call+0xa40/0xa40 [ 61.568253][ T25] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.574693][ T25] rxrpc_call_completed+0xca/0xf0 [ 61.579739][ T25] rxrpc_discard_prealloc+0x781/0xab0 [ 61.585115][ T25] ? lock_sock_nested+0x94/0x110 [ 61.590061][ T25] rxrpc_listen+0x147/0x360 [ 61.594587][ T25] afs_close_socket+0x95/0x320 [ 61.599352][ T25] ? afs_purge_servers+0x16d/0x300 [ 61.604465][ T25] ? afs_rx_discard_new_call+0x50/0x50 [ 61.609944][ T25] ? init_wait_var_entry+0x200/0x200 [ 61.615239][ T25] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.620886][ T25] ? check_preemption_disabled+0x38/0x220 [ 61.626619][ T25] afs_net_exit+0x1bc/0x310 [ 61.631121][ T25] ? afs_net_init+0xe30/0xe30 [ 61.635797][ T25] ops_exit_list.isra.0+0xa8/0x150 [ 61.640930][ T25] cleanup_net+0x511/0xa50 [ 61.645357][ T25] ? unregister_pernet_device+0x70/0x70 [ 61.650905][ T25] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.656898][ T25] process_one_work+0x965/0x1690 [ 61.661848][ T25] ? lock_release+0x800/0x800 [ 61.666525][ T25] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.672876][ T25] ? rwlock_bug.part.0+0x90/0x90 [ 61.677839][ T25] worker_thread+0x96/0xe10 [ 61.682364][ T25] ? process_one_work+0x1690/0x1690 [ 61.687566][ T25] kthread+0x3b5/0x4a0 [ 61.691633][ T25] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.697351][ T25] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.703091][ T25] ret_from_fork+0x1f/0x30 [ 61.707517][ T25] [ 61.709873][ T25] Allocated by task 6821: [ 61.714200][ T25] save_stack+0x1b/0x40 [ 61.718350][ T25] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 61.723994][ T25] kmem_cache_alloc_trace+0x153/0x7d0 [ 61.729384][ T25] afs_alloc_call+0x55/0x630 [ 61.734930][ T25] afs_charge_preallocation+0xe9/0x2d0 [ 61.740388][ T25] afs_open_socket+0x292/0x360 [ 61.745171][ T25] afs_net_init+0xa6c/0xe30 [ 61.749953][ T25] ops_init+0xaf/0x420 [ 61.754019][ T25] setup_net+0x2de/0x860 [ 61.758257][ T25] copy_net_ns+0x293/0x590 [ 61.762701][ T25] create_new_namespaces+0x3fb/0xb30 [ 61.767985][ T25] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 61.773613][ T25] ksys_unshare+0x43d/0x8e0 [ 61.778111][ T25] __x64_sys_unshare+0x2d/0x40 [ 61.782875][ T25] do_syscall_64+0x60/0xe0 [ 61.787288][ T25] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.793358][ T25] [ 61.795680][ T25] Freed by task 25: [ 61.799492][ T25] save_stack+0x1b/0x40 [ 61.803643][ T25] __kasan_slab_free+0xf7/0x140 [ 61.808575][ T25] kfree+0x109/0x2b0 [ 61.812465][ T25] afs_put_call+0x585/0xa40 [ 61.816977][ T25] rxrpc_discard_prealloc+0x764/0xab0 [ 61.822364][ T25] rxrpc_listen+0x147/0x360 [ 61.826884][ T25] afs_close_socket+0x95/0x320 [ 61.831661][ T25] afs_net_exit+0x1bc/0x310 [ 61.836179][ T25] ops_exit_list.isra.0+0xa8/0x150 [ 61.841287][ T25] cleanup_net+0x511/0xa50 [ 61.845700][ T25] process_one_work+0x965/0x1690 [ 61.850634][ T25] worker_thread+0x96/0xe10 [ 61.855133][ T25] kthread+0x3b5/0x4a0 [ 61.859227][ T25] ret_from_fork+0x1f/0x30 [ 61.863718][ T25] [ 61.866044][ T25] The buggy address belongs to the object at ffff8880946bf000 [ 61.866044][ T25] which belongs to the cache kmalloc-1k of size 1024 [ 61.880093][ T25] The buggy address is located 484 bytes inside of [ 61.880093][ T25] 1024-byte region [ffff8880946bf000, ffff8880946bf400) [ 61.893448][ T25] The buggy address belongs to the page: [ 61.899099][ T25] page:ffffea000251afc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 61.908393][ T25] flags: 0xfffe0000000200(slab) [ 61.913254][ T25] raw: 00fffe0000000200 ffffea0002516e88 ffffea000250c208 ffff8880aa000c40 [ 61.921981][ T25] raw: 0000000000000000 ffff8880946bf000 0000000100000002 0000000000000000 [ 61.930570][ T25] page dumped because: kasan: bad access detected [ 61.937325][ T25] [ 61.939641][ T25] Memory state around the buggy address: [ 61.945315][ T25] ffff8880946bf080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.954432][ T25] ffff8880946bf100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.962499][ T25] >ffff8880946bf180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.970664][ T25] ^ [ 61.977871][ T25] ffff8880946bf200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.985941][ T25] ffff8880946bf280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.994087][ T25] ================================================================== [ 62.002243][ T25] Disabling lock debugging due to kernel taint [ 62.008425][ T25] Kernel panic - not syncing: panic_on_warn set ... [ 62.015010][ T25] CPU: 0 PID: 25 Comm: kworker/u4:2 Tainted: G B 5.8.0-rc1-next-20200615-syzkaller #0 [ 62.025842][ T25] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.036070][ T25] Workqueue: netns cleanup_net [ 62.040846][ T25] Call Trace: [ 62.044143][ T25] dump_stack+0x18f/0x20d [ 62.048492][ T25] ? afs_wake_up_async_call+0x660/0x770 [ 62.054028][ T25] ? afs_put_call+0xa40/0xa40 [ 62.058702][ T25] panic+0x2e3/0x75c [ 62.062591][ T25] ? __warn_printk+0xf3/0xf3 [ 62.067198][ T25] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 62.073347][ T25] ? trace_hardirqs_on+0x55/0x220 [ 62.078365][ T25] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.083900][ T25] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.089435][ T25] ? afs_put_call+0xa40/0xa40 [ 62.094103][ T25] end_report+0x4d/0x53 [ 62.098253][ T25] kasan_report.cold+0xd/0x37 [ 62.102927][ T25] ? rcu_read_lock_held_common+0x71/0xa0 [ 62.108565][ T25] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.114102][ T25] afs_wake_up_async_call+0x6aa/0x770 [ 62.119463][ T25] ? afs_close_socket+0x320/0x320 [ 62.124479][ T25] ? afs_put_call+0xa40/0xa40 [ 62.129145][ T25] rxrpc_notify_socket+0x1db/0x5d0 [ 62.134356][ T25] ? afs_put_call+0xa40/0xa40 [ 62.139034][ T25] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.145439][ T25] rxrpc_call_completed+0xca/0xf0 [ 62.150459][ T25] rxrpc_discard_prealloc+0x781/0xab0 [ 62.155837][ T25] ? lock_sock_nested+0x94/0x110 [ 62.160769][ T25] rxrpc_listen+0x147/0x360 [ 62.165354][ T25] afs_close_socket+0x95/0x320 [ 62.170111][ T25] ? afs_purge_servers+0x16d/0x300 [ 62.175216][ T25] ? afs_rx_discard_new_call+0x50/0x50 [ 62.180693][ T25] ? init_wait_var_entry+0x200/0x200 [ 62.186038][ T25] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.191664][ T25] ? check_preemption_disabled+0x38/0x220 [ 62.197375][ T25] afs_net_exit+0x1bc/0x310 [ 62.201976][ T25] ? afs_net_init+0xe30/0xe30 [ 62.206655][ T25] ops_exit_list.isra.0+0xa8/0x150 [ 62.211772][ T25] cleanup_net+0x511/0xa50 [ 62.216181][ T25] ? unregister_pernet_device+0x70/0x70 [ 62.221722][ T25] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.227787][ T25] process_one_work+0x965/0x1690 [ 62.232723][ T25] ? lock_release+0x800/0x800 [ 62.237416][ T25] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.242782][ T25] ? rwlock_bug.part.0+0x90/0x90 [ 62.247741][ T25] worker_thread+0x96/0xe10 [ 62.252246][ T25] ? process_one_work+0x1690/0x1690 [ 62.257437][ T25] kthread+0x3b5/0x4a0 [ 62.261502][ T25] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.267235][ T25] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.272947][ T25] ret_from_fork+0x1f/0x30 [ 62.278945][ T25] Kernel Offset: disabled [ 62.283283][ T25] Rebooting in 86400 seconds..