Warning: Permanently added '10.128.15.210' (ECDSA) to the list of known hosts. 2020/06/19 04:22:43 fuzzer started 2020/06/19 04:22:43 connecting to host at 10.128.0.26:34603 2020/06/19 04:22:43 checking machine... 2020/06/19 04:22:43 checking revisions... 2020/06/19 04:22:43 testing simple program... syzkaller login: [ 60.405693][ T6829] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 04:22:43 building call list... [ 60.753537][ T7] tipc: TX() has been purged, node left! [ 61.285909][ T7] ================================================================== [ 61.294181][ T7] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 61.302081][ T7] Write of size 1 at addr ffff8880a1e4c1e4 by task kworker/u4:0/7 [ 61.309875][ T7] [ 61.312204][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc1-syzkaller #0 [ 61.320342][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.330410][ T7] Workqueue: netns cleanup_net [ 61.335172][ T7] Call Trace: [ 61.338464][ T7] dump_stack+0x18f/0x20d [ 61.342792][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.348335][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.354009][ T7] ? afs_put_call+0xa40/0xa40 [ 61.358692][ T7] print_address_description.constprop.0.cold+0xd3/0x413 [ 61.365730][ T7] ? vprintk_func+0x97/0x1a6 [ 61.370349][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.375888][ T7] kasan_report.cold+0x1f/0x37 [ 61.380830][ T7] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.386455][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.392009][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 61.397391][ T7] ? afs_close_socket+0x320/0x320 [ 61.402411][ T7] ? afs_put_call+0xa40/0xa40 [ 61.407092][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 61.412223][ T7] ? afs_put_call+0xa40/0xa40 [ 61.416904][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.423408][ T7] rxrpc_call_completed+0xca/0xf0 [ 61.428435][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 61.433809][ T7] ? lock_sock_nested+0x94/0x110 [ 61.438836][ T7] rxrpc_listen+0x147/0x360 [ 61.443342][ T7] afs_close_socket+0x95/0x320 [ 61.448187][ T7] ? afs_purge_servers+0x16d/0x300 [ 61.453296][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 61.458845][ T7] ? init_wait_var_entry+0x200/0x200 [ 61.464132][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.469886][ T7] ? check_preemption_disabled+0x38/0x220 [ 61.475610][ T7] afs_net_exit+0x1bc/0x310 [ 61.480110][ T7] ? afs_net_init+0xe30/0xe30 [ 61.484781][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 61.489892][ T7] cleanup_net+0x511/0xa50 [ 61.494315][ T7] ? unregister_pernet_device+0x70/0x70 [ 61.499862][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.505847][ T7] process_one_work+0x965/0x1690 [ 61.510793][ T7] ? lock_release+0x800/0x800 [ 61.515466][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.520939][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 61.526686][ T7] worker_thread+0x96/0xe10 [ 61.531212][ T7] ? process_one_work+0x1690/0x1690 [ 61.536585][ T7] kthread+0x3b5/0x4a0 [ 61.540738][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.547147][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.552868][ T7] ret_from_fork+0x1f/0x30 [ 61.557383][ T7] [ 61.559710][ T7] Allocated by task 6829: [ 61.564034][ T7] save_stack+0x1b/0x40 [ 61.568183][ T7] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 61.573808][ T7] kmem_cache_alloc_trace+0x153/0x7d0 [ 61.579172][ T7] afs_alloc_call+0x55/0x630 [ 61.583754][ T7] afs_charge_preallocation+0xe9/0x2d0 [ 61.589203][ T7] afs_open_socket+0x292/0x360 [ 61.593964][ T7] afs_net_init+0xa6c/0xe30 [ 61.598467][ T7] ops_init+0xaf/0x420 [ 61.602526][ T7] setup_net+0x2de/0x860 [ 61.606759][ T7] copy_net_ns+0x293/0x590 [ 61.611172][ T7] create_new_namespaces+0x3fb/0xb30 [ 61.616470][ T7] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 61.622117][ T7] ksys_unshare+0x43d/0x8e0 [ 61.626633][ T7] __x64_sys_unshare+0x2d/0x40 [ 61.631826][ T7] do_syscall_64+0x60/0xe0 [ 61.636248][ T7] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.642126][ T7] [ 61.644457][ T7] Freed by task 7: [ 61.648190][ T7] save_stack+0x1b/0x40 [ 61.652354][ T7] __kasan_slab_free+0xf7/0x140 [ 61.657359][ T7] kfree+0x109/0x2b0 [ 61.661256][ T7] afs_put_call+0x585/0xa40 [ 61.665985][ T7] rxrpc_discard_prealloc+0x764/0xab0 [ 61.671344][ T7] rxrpc_listen+0x147/0x360 [ 61.675885][ T7] afs_close_socket+0x95/0x320 [ 61.681169][ T7] afs_net_exit+0x1bc/0x310 [ 61.685703][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 61.690823][ T7] cleanup_net+0x511/0xa50 [ 61.695678][ T7] process_one_work+0x965/0x1690 [ 61.700622][ T7] worker_thread+0x96/0xe10 [ 61.705122][ T7] kthread+0x3b5/0x4a0 [ 61.709218][ T7] ret_from_fork+0x1f/0x30 [ 61.713624][ T7] [ 61.715966][ T7] The buggy address belongs to the object at ffff8880a1e4c000 [ 61.715966][ T7] which belongs to the cache kmalloc-1k of size 1024 [ 61.730544][ T7] The buggy address is located 484 bytes inside of [ 61.730544][ T7] 1024-byte region [ffff8880a1e4c000, ffff8880a1e4c400) [ 61.744852][ T7] The buggy address belongs to the page: [ 61.750486][ T7] page:ffffea0002879300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 61.759690][ T7] flags: 0xfffe0000000200(slab) [ 61.764552][ T7] raw: 00fffe0000000200 ffffea00028492c8 ffffea00023a5548 ffff8880aa000c40 [ 61.773231][ T7] raw: 0000000000000000 ffff8880a1e4c000 0000000100000002 0000000000000000 [ 61.781833][ T7] page dumped because: kasan: bad access detected [ 61.788236][ T7] [ 61.790555][ T7] Memory state around the buggy address: [ 61.796185][ T7] ffff8880a1e4c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.804503][ T7] ffff8880a1e4c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.812560][ T7] >ffff8880a1e4c180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.820615][ T7] ^ [ 61.827829][ T7] ffff8880a1e4c200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.835908][ T7] ffff8880a1e4c280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.843986][ T7] ================================================================== [ 61.852044][ T7] Disabling lock debugging due to kernel taint [ 61.858245][ T7] Kernel panic - not syncing: panic_on_warn set ... [ 61.865393][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 61.875014][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.885081][ T7] Workqueue: netns cleanup_net [ 61.889830][ T7] Call Trace: [ 61.893117][ T7] dump_stack+0x18f/0x20d [ 61.897442][ T7] ? afs_wake_up_async_call+0x670/0x770 [ 61.902976][ T7] ? afs_put_call+0xa40/0xa40 [ 61.907646][ T7] panic+0x2e3/0x75c [ 61.911535][ T7] ? __warn_printk+0xf3/0xf3 [ 61.916122][ T7] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 61.922619][ T7] ? trace_hardirqs_on+0x55/0x220 [ 61.927637][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.933173][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.938821][ T7] ? afs_put_call+0xa40/0xa40 [ 61.943491][ T7] end_report+0x4d/0x53 [ 61.947638][ T7] kasan_report.cold+0xd/0x37 [ 61.953610][ T7] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.959229][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.964851][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 61.970216][ T7] ? afs_close_socket+0x320/0x320 [ 61.975232][ T7] ? afs_put_call+0xa40/0xa40 [ 61.979989][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 61.985103][ T7] ? afs_put_call+0xa40/0xa40 [ 61.989774][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.996184][ T7] rxrpc_call_completed+0xca/0xf0 [ 62.001270][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 62.006649][ T7] ? lock_sock_nested+0x94/0x110 [ 62.011606][ T7] rxrpc_listen+0x147/0x360 [ 62.016132][ T7] afs_close_socket+0x95/0x320 [ 62.020892][ T7] ? afs_purge_servers+0x16d/0x300 [ 62.026022][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 62.031566][ T7] ? init_wait_var_entry+0x200/0x200 [ 62.036854][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.042485][ T7] ? check_preemption_disabled+0x38/0x220 [ 62.048195][ T7] afs_net_exit+0x1bc/0x310 [ 62.052689][ T7] ? afs_net_init+0xe30/0xe30 [ 62.057356][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 62.062459][ T7] cleanup_net+0x511/0xa50 [ 62.067005][ T7] ? unregister_pernet_device+0x70/0x70 [ 62.072549][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.078528][ T7] process_one_work+0x965/0x1690 [ 62.083509][ T7] ? lock_release+0x800/0x800 [ 62.088177][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.093541][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 62.098473][ T7] worker_thread+0x96/0xe10 [ 62.102974][ T7] ? process_one_work+0x1690/0x1690 [ 62.108163][ T7] kthread+0x3b5/0x4a0 [ 62.112223][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.117938][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.123654][ T7] ret_from_fork+0x1f/0x30 [ 62.129568][ T7] Kernel Offset: disabled [ 62.134029][ T7] Rebooting in 86400 seconds..