Warning: Permanently added '10.128.1.44' (ECDSA) to the list of known hosts. 2020/07/01 17:11:40 fuzzer started 2020/07/01 17:11:40 connecting to host at 10.128.0.26:36053 2020/07/01 17:11:40 checking machine... 2020/07/01 17:11:40 checking revisions... 2020/07/01 17:11:40 testing simple program... syzkaller login: [ 59.790497][ T6810] IPVS: ftp: loaded support on port[0] = 21 2020/07/01 17:11:41 building call list... [ 60.105939][ T21] tipc: TX() has been purged, node left! [ 60.638209][ T21] ================================================================== [ 60.646443][ T21] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x430/0x4a0 [ 60.654329][ T21] Write of size 1 at addr ffff8880a895a9e4 by task kworker/u4:1/21 [ 60.662215][ T21] [ 60.664550][ T21] CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.8.0-rc1-syzkaller #0 [ 60.672776][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.682830][ T21] Workqueue: netns cleanup_net [ 60.687584][ T21] Call Trace: [ 60.690875][ T21] dump_stack+0x18f/0x20d [ 60.695204][ T21] ? afs_wake_up_async_call+0x430/0x4a0 [ 60.700745][ T21] ? afs_wake_up_async_call+0x430/0x4a0 [ 60.706284][ T21] ? afs_put_call+0x440/0x440 [ 60.710961][ T21] print_address_description.constprop.0.cold+0xae/0x436 [ 60.717988][ T21] ? vprintk_func+0x97/0x1a6 [ 60.722578][ T21] ? afs_wake_up_async_call+0x430/0x4a0 [ 60.728234][ T21] kasan_report.cold+0x1f/0x37 [ 60.733001][ T21] ? afs_wake_up_async_call+0x430/0x4a0 [ 60.738544][ T21] afs_wake_up_async_call+0x430/0x4a0 [ 60.743910][ T21] ? afs_close_socket+0x320/0x320 [ 60.748939][ T21] rxrpc_notify_socket+0x1db/0x5d0 [ 60.754052][ T21] ? afs_put_call+0x440/0x440 [ 60.758727][ T21] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 60.765141][ T21] rxrpc_call_completed+0xd0/0xf0 [ 60.770165][ T21] rxrpc_discard_prealloc+0x777/0xab0 [ 60.775532][ T21] ? lock_sock_nested+0x94/0x110 [ 60.780473][ T21] rxrpc_listen+0x11c/0x330 [ 60.784975][ T21] afs_close_socket+0x95/0x320 [ 60.789732][ T21] ? afs_purge_servers+0x16d/0x300 [ 60.794842][ T21] ? afs_rx_discard_new_call+0x50/0x50 [ 60.800298][ T21] ? init_wait_var_entry+0x200/0x200 [ 60.805592][ T21] ? check_preemption_disabled+0x38/0x220 [ 60.811311][ T21] afs_net_exit+0x1bc/0x310 [ 60.815809][ T21] ? __bpf_trace_afs_cb_miss+0x100/0x100 [ 60.821436][ T21] ops_exit_list+0xb0/0x160 [ 60.825940][ T21] cleanup_net+0x4ea/0xa00 [ 60.830353][ T21] ? __schedule+0x887/0x1eb0 [ 60.834937][ T21] ? ops_free_list.part.0+0x3d0/0x3d0 [ 60.840306][ T21] ? check_preemption_disabled+0x38/0x220 [ 60.846029][ T21] process_one_work+0x94c/0x1670 [ 60.850976][ T21] ? lock_release+0x8d0/0x8d0 [ 60.855645][ T21] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 60.861018][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 60.865965][ T21] worker_thread+0x64c/0x1120 [ 60.870657][ T21] ? process_one_work+0x1670/0x1670 [ 60.875851][ T21] kthread+0x3b5/0x4a0 [ 60.879912][ T21] ? __kthread_bind_mask+0xc0/0xc0 [ 60.885014][ T21] ? __kthread_bind_mask+0xc0/0xc0 [ 60.890123][ T21] ret_from_fork+0x1f/0x30 [ 60.894542][ T21] [ 60.896864][ T21] Allocated by task 6810: [ 60.901187][ T21] save_stack+0x1b/0x40 [ 60.905336][ T21] __kasan_kmalloc.constprop.0+0xc2/0xd0 [ 60.910960][ T21] kmem_cache_alloc_trace+0x14f/0x2d0 [ 60.916327][ T21] afs_alloc_call+0x4f/0x360 [ 60.921084][ T21] afs_charge_preallocation+0xe9/0x2d0 [ 60.926535][ T21] afs_open_socket+0x294/0x360 [ 60.931297][ T21] afs_net_init+0xa6c/0xe30 [ 60.935892][ T21] ops_init+0xaf/0x470 [ 60.939951][ T21] setup_net+0x2d8/0x850 [ 60.944197][ T21] copy_net_ns+0x2cf/0x5e0 [ 60.948609][ T21] create_new_namespaces+0x3f6/0xb10 [ 60.953888][ T21] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 60.959513][ T21] ksys_unshare+0x36c/0x9a0 [ 60.964006][ T21] __x64_sys_unshare+0x2d/0x40 [ 60.968759][ T21] do_syscall_64+0x60/0xe0 [ 60.973171][ T21] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 60.979047][ T21] [ 60.981367][ T21] Freed by task 21: [ 60.985168][ T21] save_stack+0x1b/0x40 [ 60.989317][ T21] __kasan_slab_free+0xf5/0x140 [ 60.994160][ T21] kfree+0x103/0x2c0 [ 60.998050][ T21] afs_put_call+0x345/0x440 [ 61.002547][ T21] rxrpc_discard_prealloc+0x75a/0xab0 [ 61.007922][ T21] rxrpc_listen+0x11c/0x330 [ 61.012420][ T21] afs_close_socket+0x95/0x320 [ 61.017180][ T21] afs_net_exit+0x1bc/0x310 [ 61.021790][ T21] ops_exit_list+0xb0/0x160 [ 61.026300][ T21] cleanup_net+0x4ea/0xa00 [ 61.030719][ T21] process_one_work+0x94c/0x1670 [ 61.035653][ T21] worker_thread+0x64c/0x1120 [ 61.040320][ T21] kthread+0x3b5/0x4a0 [ 61.044386][ T21] ret_from_fork+0x1f/0x30 [ 61.048784][ T21] [ 61.051108][ T21] The buggy address belongs to the object at ffff8880a895a800 [ 61.051108][ T21] which belongs to the cache kmalloc-1k of size 1024 [ 61.065164][ T21] The buggy address is located 484 bytes inside of [ 61.065164][ T21] 1024-byte region [ffff8880a895a800, ffff8880a895ac00) [ 61.078512][ T21] The buggy address belongs to the page: [ 61.084142][ T21] page:ffffea0002a25680 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a895a000 [ 61.094543][ T21] flags: 0xfffe0000000200(slab) [ 61.099399][ T21] raw: 00fffe0000000200 ffffea00028b0b88 ffffea00027f4a88 ffff8880aa000c40 [ 61.107983][ T21] raw: ffff8880a895a000 ffff8880a895a000 0000000100000001 0000000000000000 [ 61.116559][ T21] page dumped because: kasan: bad access detected [ 61.122955][ T21] [ 61.125270][ T21] Memory state around the buggy address: [ 61.130895][ T21] ffff8880a895a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.138950][ T21] ffff8880a895a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.147004][ T21] >ffff8880a895a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.155052][ T21] ^ [ 61.162240][ T21] ffff8880a895aa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.170293][ T21] ffff8880a895aa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.178339][ T21] ================================================================== [ 61.186388][ T21] Disabling lock debugging due to kernel taint [ 61.192585][ T21] Kernel panic - not syncing: panic_on_warn set ... [ 61.199172][ T21] CPU: 1 PID: 21 Comm: kworker/u4:1 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 61.208789][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.218846][ T21] Workqueue: netns cleanup_net [ 61.223694][ T21] Call Trace: [ 61.226981][ T21] dump_stack+0x18f/0x20d [ 61.231307][ T21] ? afs_wake_up_async_call+0x350/0x4a0 [ 61.236843][ T21] ? afs_put_call+0x440/0x440 [ 61.241508][ T21] panic+0x2e3/0x75c [ 61.245400][ T21] ? __warn_printk+0xf3/0xf3 [ 61.249987][ T21] ? afs_wake_up_async_call+0x430/0x4a0 [ 61.255528][ T21] ? trace_hardirqs_on+0x55/0x220 [ 61.260552][ T21] ? afs_wake_up_async_call+0x430/0x4a0 [ 61.266614][ T21] ? afs_wake_up_async_call+0x430/0x4a0 [ 61.272145][ T21] ? afs_put_call+0x440/0x440 [ 61.276813][ T21] end_report+0x4d/0x53 [ 61.280960][ T21] kasan_report.cold+0xd/0x37 [ 61.285626][ T21] ? afs_wake_up_async_call+0x430/0x4a0 [ 61.291159][ T21] afs_wake_up_async_call+0x430/0x4a0 [ 61.296518][ T21] ? afs_close_socket+0x320/0x320 [ 61.301544][ T21] rxrpc_notify_socket+0x1db/0x5d0 [ 61.306646][ T21] ? afs_put_call+0x440/0x440 [ 61.311313][ T21] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.317717][ T21] rxrpc_call_completed+0xd0/0xf0 [ 61.322730][ T21] rxrpc_discard_prealloc+0x777/0xab0 [ 61.328092][ T21] ? lock_sock_nested+0x94/0x110 [ 61.333021][ T21] rxrpc_listen+0x11c/0x330 [ 61.337514][ T21] afs_close_socket+0x95/0x320 [ 61.342270][ T21] ? afs_purge_servers+0x16d/0x300 [ 61.347368][ T21] ? afs_rx_discard_new_call+0x50/0x50 [ 61.352815][ T21] ? init_wait_var_entry+0x200/0x200 [ 61.358093][ T21] ? check_preemption_disabled+0x38/0x220 [ 61.363800][ T21] afs_net_exit+0x1bc/0x310 [ 61.368305][ T21] ? __bpf_trace_afs_cb_miss+0x100/0x100 [ 61.375314][ T21] ops_exit_list+0xb0/0x160 [ 61.379809][ T21] cleanup_net+0x4ea/0xa00 [ 61.384213][ T21] ? __schedule+0x887/0x1eb0 [ 61.388794][ T21] ? ops_free_list.part.0+0x3d0/0x3d0 [ 61.394159][ T21] ? check_preemption_disabled+0x38/0x220 [ 61.399872][ T21] process_one_work+0x94c/0x1670 [ 61.404802][ T21] ? lock_release+0x8d0/0x8d0 [ 61.409468][ T21] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 61.414831][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 61.419761][ T21] worker_thread+0x64c/0x1120 [ 61.424432][ T21] ? process_one_work+0x1670/0x1670 [ 61.429616][ T21] kthread+0x3b5/0x4a0 [ 61.433674][ T21] ? __kthread_bind_mask+0xc0/0xc0 [ 61.438772][ T21] ? __kthread_bind_mask+0xc0/0xc0 [ 61.443874][ T21] ret_from_fork+0x1f/0x30 [ 61.449691][ T21] Kernel Offset: disabled [ 61.454002][ T21] Rebooting in 86400 seconds..