Warning: Permanently added '10.128.10.62' (ECDSA) to the list of known hosts. 2020/06/17 22:10:50 fuzzer started 2020/06/17 22:10:50 connecting to host at 10.128.0.26:39169 2020/06/17 22:10:50 checking machine... 2020/06/17 22:10:50 checking revisions... 2020/06/17 22:10:50 testing simple program... syzkaller login: [ 65.530390][ T6838] IPVS: ftp: loaded support on port[0] = 21 2020/06/17 22:10:50 building call list... [ 65.851767][ T21] tipc: TX() has been purged, node left! [ 66.364112][ T21] ================================================================== [ 66.372641][ T21] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 66.380539][ T21] Write of size 1 at addr ffff88809e8f89e4 by task kworker/u4:1/21 [ 66.388417][ T21] [ 66.390752][ T21] CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.8.0-rc1-syzkaller #0 [ 66.398985][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.409060][ T21] Workqueue: netns cleanup_net [ 66.413876][ T21] Call Trace: [ 66.417273][ T21] dump_stack+0x18f/0x20d [ 66.421908][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.427477][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.433459][ T21] ? afs_put_call+0xa40/0xa40 [ 66.438589][ T21] print_address_description.constprop.0.cold+0xd3/0x413 [ 66.445894][ T21] ? vprintk_func+0x97/0x1a6 [ 66.450616][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.456173][ T21] kasan_report.cold+0x1f/0x37 [ 66.460952][ T21] ? rcu_read_lock_held_common+0x51/0xa0 [ 66.466749][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.472516][ T21] afs_wake_up_async_call+0x6aa/0x770 [ 66.477916][ T21] ? afs_close_socket+0x320/0x320 [ 66.483207][ T21] ? afs_put_call+0xa40/0xa40 [ 66.487885][ T21] rxrpc_notify_socket+0x1db/0x5d0 [ 66.493001][ T21] ? afs_put_call+0xa40/0xa40 [ 66.497678][ T21] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 66.504181][ T21] rxrpc_call_completed+0xca/0xf0 [ 66.509494][ T21] rxrpc_discard_prealloc+0x781/0xab0 [ 66.514881][ T21] ? lock_sock_nested+0x94/0x110 [ 66.519826][ T21] rxrpc_listen+0x147/0x360 [ 66.524356][ T21] afs_close_socket+0x95/0x320 [ 66.529117][ T21] ? afs_purge_servers+0x16d/0x300 [ 66.534233][ T21] ? afs_rx_discard_new_call+0x50/0x50 [ 66.539699][ T21] ? init_wait_var_entry+0x200/0x200 [ 66.544991][ T21] ? rcu_read_lock_held_common+0xa0/0xa0 [ 66.550623][ T21] ? check_preemption_disabled+0x38/0x220 [ 66.556345][ T21] afs_net_exit+0x1bc/0x310 [ 66.560847][ T21] ? afs_net_init+0xe30/0xe30 [ 66.565521][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 66.570636][ T21] cleanup_net+0x511/0xa50 [ 66.575056][ T21] ? unregister_pernet_device+0x70/0x70 [ 66.580611][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.586599][ T21] process_one_work+0x965/0x1690 [ 66.591633][ T21] ? lock_release+0x800/0x800 [ 66.596312][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 66.601715][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 66.606679][ T21] worker_thread+0x96/0xe10 [ 66.611213][ T21] ? process_one_work+0x1690/0x1690 [ 66.616413][ T21] kthread+0x3b5/0x4a0 [ 66.620569][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.626310][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.632044][ T21] ret_from_fork+0x1f/0x30 [ 66.636503][ T21] [ 66.638852][ T21] Allocated by task 6838: [ 66.643179][ T21] save_stack+0x1b/0x40 [ 66.647333][ T21] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 66.653059][ T21] kmem_cache_alloc_trace+0x153/0x7d0 [ 66.658487][ T21] afs_alloc_call+0x55/0x630 [ 66.663436][ T21] afs_charge_preallocation+0xe9/0x2d0 [ 66.669010][ T21] afs_open_socket+0x292/0x360 [ 66.673782][ T21] afs_net_init+0xa6c/0xe30 [ 66.678284][ T21] ops_init+0xaf/0x420 [ 66.682360][ T21] setup_net+0x2de/0x860 [ 66.686602][ T21] copy_net_ns+0x293/0x590 [ 66.691017][ T21] create_new_namespaces+0x3fb/0xb30 [ 66.696472][ T21] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 66.702102][ T21] ksys_unshare+0x43d/0x8e0 [ 66.706689][ T21] __x64_sys_unshare+0x2d/0x40 [ 66.711448][ T21] do_syscall_64+0x60/0xe0 [ 66.716235][ T21] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.722127][ T21] [ 66.724472][ T21] Freed by task 21: [ 66.728281][ T21] save_stack+0x1b/0x40 [ 66.732464][ T21] __kasan_slab_free+0xf7/0x140 [ 66.737323][ T21] kfree+0x109/0x2b0 [ 66.741215][ T21] afs_put_call+0x585/0xa40 [ 66.745972][ T21] rxrpc_discard_prealloc+0x764/0xab0 [ 66.751375][ T21] rxrpc_listen+0x147/0x360 [ 66.755880][ T21] afs_close_socket+0x95/0x320 [ 66.760635][ T21] afs_net_exit+0x1bc/0x310 [ 66.765143][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 66.770505][ T21] cleanup_net+0x511/0xa50 [ 66.775003][ T21] process_one_work+0x965/0x1690 [ 66.780455][ T21] worker_thread+0x96/0xe10 [ 66.785488][ T21] kthread+0x3b5/0x4a0 [ 66.789861][ T21] ret_from_fork+0x1f/0x30 [ 66.794276][ T21] [ 66.796778][ T21] The buggy address belongs to the object at ffff88809e8f8800 [ 66.796778][ T21] which belongs to the cache kmalloc-1k of size 1024 [ 66.811172][ T21] The buggy address is located 484 bytes inside of [ 66.811172][ T21] 1024-byte region [ffff88809e8f8800, ffff88809e8f8c00) [ 66.825001][ T21] The buggy address belongs to the page: [ 66.831421][ T21] page:ffffea00027a3e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 66.841323][ T21] flags: 0xfffe0000000200(slab) [ 66.846327][ T21] raw: 00fffe0000000200 ffffea0002675248 ffffea0002a42208 ffff8880aa000c40 [ 66.855829][ T21] raw: 0000000000000000 ffff88809e8f8000 0000000100000002 0000000000000000 [ 66.864563][ T21] page dumped because: kasan: bad access detected [ 66.871060][ T21] [ 66.873420][ T21] Memory state around the buggy address: [ 66.879066][ T21] ffff88809e8f8880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.887435][ T21] ffff88809e8f8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.895496][ T21] >ffff88809e8f8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.903577][ T21] ^ [ 66.910769][ T21] ffff88809e8f8a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.919106][ T21] ffff88809e8f8a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.927164][ T21] ================================================================== [ 66.935355][ T21] Disabling lock debugging due to kernel taint [ 66.941829][ T21] Kernel panic - not syncing: panic_on_warn set ... [ 66.948438][ T21] CPU: 1 PID: 21 Comm: kworker/u4:1 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 66.958151][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.968428][ T21] Workqueue: netns cleanup_net [ 66.973374][ T21] Call Trace: [ 66.976669][ T21] dump_stack+0x18f/0x20d [ 66.981272][ T21] ? afs_wake_up_async_call+0x680/0x770 [ 66.986907][ T21] ? afs_put_call+0xa40/0xa40 [ 66.991589][ T21] panic+0x2e3/0x75c [ 66.995562][ T21] ? __warn_printk+0xf3/0xf3 [ 67.000247][ T21] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 67.006547][ T21] ? trace_hardirqs_on+0x55/0x220 [ 67.011571][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 67.017101][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 67.022747][ T21] ? afs_put_call+0xa40/0xa40 [ 67.027504][ T21] end_report+0x4d/0x53 [ 67.031653][ T21] kasan_report.cold+0xd/0x37 [ 67.036544][ T21] ? rcu_read_lock_held_common+0x51/0xa0 [ 67.042182][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 67.047746][ T21] afs_wake_up_async_call+0x6aa/0x770 [ 67.053210][ T21] ? afs_close_socket+0x320/0x320 [ 67.058227][ T21] ? afs_put_call+0xa40/0xa40 [ 67.063094][ T21] rxrpc_notify_socket+0x1db/0x5d0 [ 67.068292][ T21] ? afs_put_call+0xa40/0xa40 [ 67.073119][ T21] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 67.079825][ T21] rxrpc_call_completed+0xca/0xf0 [ 67.084850][ T21] rxrpc_discard_prealloc+0x781/0xab0 [ 67.090319][ T21] ? lock_sock_nested+0x94/0x110 [ 67.095355][ T21] rxrpc_listen+0x147/0x360 [ 67.099864][ T21] afs_close_socket+0x95/0x320 [ 67.104625][ T21] ? afs_purge_servers+0x16d/0x300 [ 67.109779][ T21] ? afs_rx_discard_new_call+0x50/0x50 [ 67.115354][ T21] ? init_wait_var_entry+0x200/0x200 [ 67.120644][ T21] ? rcu_read_lock_held_common+0xa0/0xa0 [ 67.126275][ T21] ? check_preemption_disabled+0x38/0x220 [ 67.132106][ T21] afs_net_exit+0x1bc/0x310 [ 67.136610][ T21] ? afs_net_init+0xe30/0xe30 [ 67.142414][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 67.147792][ T21] cleanup_net+0x511/0xa50 [ 67.152347][ T21] ? unregister_pernet_device+0x70/0x70 [ 67.157975][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 67.164140][ T21] process_one_work+0x965/0x1690 [ 67.169137][ T21] ? lock_release+0x800/0x800 [ 67.173845][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 67.179745][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 67.184690][ T21] worker_thread+0x96/0xe10 [ 67.189194][ T21] ? process_one_work+0x1690/0x1690 [ 67.194637][ T21] kthread+0x3b5/0x4a0 [ 67.198717][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 67.204449][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 67.210157][ T21] ret_from_fork+0x1f/0x30 [ 67.215923][ T21] Kernel Offset: disabled [ 67.220266][ T21] Rebooting in 86400 seconds..