Warning: Permanently added '10.128.10.17' (ECDSA) to the list of known hosts. 2020/06/19 07:56:40 fuzzer started 2020/06/19 07:56:40 connecting to host at 10.128.0.26:38201 2020/06/19 07:56:40 checking machine... 2020/06/19 07:56:40 checking revisions... 2020/06/19 07:56:40 testing simple program... syzkaller login: [ 60.909721][ T6824] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 07:56:41 building call list... [ 61.254930][ T671] tipc: TX() has been purged, node left! [ 61.737320][ T671] ================================================================== [ 61.745557][ T671] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 61.753443][ T671] Write of size 1 at addr ffff8880a84089e4 by task kworker/u4:5/671 [ 61.761511][ T671] [ 61.763843][ T671] CPU: 1 PID: 671 Comm: kworker/u4:5 Not tainted 5.8.0-rc1-syzkaller #0 [ 61.772160][ T671] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.782214][ T671] Workqueue: netns cleanup_net [ 61.786967][ T671] Call Trace: [ 61.790352][ T671] dump_stack+0x18f/0x20d [ 61.794678][ T671] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.800236][ T671] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.805775][ T671] ? afs_put_call+0xa40/0xa40 [ 61.810449][ T671] print_address_description.constprop.0.cold+0xd3/0x413 [ 61.817475][ T671] ? vprintk_func+0x97/0x1a6 [ 61.822064][ T671] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.827617][ T671] kasan_report.cold+0x1f/0x37 [ 61.832386][ T671] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.838013][ T671] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.843558][ T671] afs_wake_up_async_call+0x6aa/0x770 [ 61.848938][ T671] ? afs_close_socket+0x320/0x320 [ 61.854138][ T671] ? afs_put_call+0xa40/0xa40 [ 61.858813][ T671] rxrpc_notify_socket+0x1db/0x5d0 [ 61.863930][ T671] ? afs_put_call+0xa40/0xa40 [ 61.868620][ T671] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.875067][ T671] rxrpc_call_completed+0xca/0xf0 [ 61.880096][ T671] rxrpc_discard_prealloc+0x781/0xab0 [ 61.885480][ T671] ? lock_sock_nested+0x94/0x110 [ 61.890419][ T671] rxrpc_listen+0x147/0x360 [ 61.895183][ T671] afs_close_socket+0x95/0x320 [ 61.899941][ T671] ? afs_purge_servers+0x16d/0x300 [ 61.905052][ T671] ? afs_rx_discard_new_call+0x50/0x50 [ 61.910513][ T671] ? init_wait_var_entry+0x200/0x200 [ 61.915800][ T671] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.921430][ T671] ? check_preemption_disabled+0x38/0x220 [ 61.927165][ T671] afs_net_exit+0x1bc/0x310 [ 61.931680][ T671] ? afs_net_init+0xe30/0xe30 [ 61.936360][ T671] ops_exit_list.isra.0+0xa8/0x150 [ 61.941473][ T671] cleanup_net+0x511/0xa50 [ 61.945897][ T671] ? unregister_pernet_device+0x70/0x70 [ 61.951446][ T671] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.957432][ T671] process_one_work+0x965/0x1690 [ 61.962377][ T671] ? lock_release+0x800/0x800 [ 61.967069][ T671] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.972441][ T671] ? rwlock_bug.part.0+0x90/0x90 [ 61.977386][ T671] worker_thread+0x96/0xe10 [ 61.981917][ T671] ? process_one_work+0x1690/0x1690 [ 61.987116][ T671] kthread+0x3b5/0x4a0 [ 61.991182][ T671] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.996898][ T671] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.004979][ T671] ret_from_fork+0x1f/0x30 [ 62.009404][ T671] [ 62.011727][ T671] Allocated by task 6824: [ 62.016063][ T671] save_stack+0x1b/0x40 [ 62.020246][ T671] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 62.025892][ T671] kmem_cache_alloc_trace+0x153/0x7d0 [ 62.031263][ T671] afs_alloc_call+0x55/0x630 [ 62.035848][ T671] afs_charge_preallocation+0xe9/0x2d0 [ 62.041304][ T671] afs_open_socket+0x292/0x360 [ 62.046059][ T671] afs_net_init+0xa6c/0xe30 [ 62.050553][ T671] ops_init+0xaf/0x420 [ 62.054614][ T671] setup_net+0x2de/0x860 [ 62.058847][ T671] copy_net_ns+0x293/0x590 [ 62.063258][ T671] create_new_namespaces+0x3fb/0xb30 [ 62.068539][ T671] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 62.074302][ T671] ksys_unshare+0x43d/0x8e0 [ 62.078796][ T671] __x64_sys_unshare+0x2d/0x40 [ 62.083569][ T671] do_syscall_64+0x60/0xe0 [ 62.087994][ T671] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 62.093987][ T671] [ 62.096312][ T671] Freed by task 671: [ 62.100204][ T671] save_stack+0x1b/0x40 [ 62.104356][ T671] __kasan_slab_free+0xf7/0x140 [ 62.109204][ T671] kfree+0x109/0x2b0 [ 62.113115][ T671] afs_put_call+0x585/0xa40 [ 62.117614][ T671] rxrpc_discard_prealloc+0x764/0xab0 [ 62.122994][ T671] rxrpc_listen+0x147/0x360 [ 62.127510][ T671] afs_close_socket+0x95/0x320 [ 62.132273][ T671] afs_net_exit+0x1bc/0x310 [ 62.136772][ T671] ops_exit_list.isra.0+0xa8/0x150 [ 62.141878][ T671] cleanup_net+0x511/0xa50 [ 62.146286][ T671] process_one_work+0x965/0x1690 [ 62.151256][ T671] worker_thread+0x96/0xe10 [ 62.155750][ T671] kthread+0x3b5/0x4a0 [ 62.159812][ T671] ret_from_fork+0x1f/0x30 [ 62.164311][ T671] [ 62.166634][ T671] The buggy address belongs to the object at ffff8880a8408800 [ 62.166634][ T671] which belongs to the cache kmalloc-1k of size 1024 [ 62.180684][ T671] The buggy address is located 484 bytes inside of [ 62.180684][ T671] 1024-byte region [ffff8880a8408800, ffff8880a8408c00) [ 62.194071][ T671] The buggy address belongs to the page: [ 62.199724][ T671] page:ffffea0002a10200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 62.208837][ T671] flags: 0xfffe0000000200(slab) [ 62.218476][ T671] raw: 00fffe0000000200 ffffea00028dad48 ffffea00029b4808 ffff8880aa000c40 [ 62.227067][ T671] raw: 0000000000000000 ffff8880a8408000 0000000100000002 0000000000000000 [ 62.235645][ T671] page dumped because: kasan: bad access detected [ 62.242153][ T671] [ 62.244473][ T671] Memory state around the buggy address: [ 62.250103][ T671] ffff8880a8408880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.258160][ T671] ffff8880a8408900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.266217][ T671] >ffff8880a8408980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.274270][ T671] ^ [ 62.281459][ T671] ffff8880a8408a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.289529][ T671] ffff8880a8408a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.297577][ T671] ================================================================== [ 62.305645][ T671] Disabling lock debugging due to kernel taint [ 62.311843][ T671] Kernel panic - not syncing: panic_on_warn set ... [ 62.318423][ T671] CPU: 1 PID: 671 Comm: kworker/u4:5 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 62.328120][ T671] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.338170][ T671] Workqueue: netns cleanup_net [ 62.342917][ T671] Call Trace: [ 62.346201][ T671] dump_stack+0x18f/0x20d [ 62.350545][ T671] ? afs_wake_up_async_call+0x680/0x770 [ 62.356171][ T671] ? afs_put_call+0xa40/0xa40 [ 62.360840][ T671] panic+0x2e3/0x75c [ 62.364724][ T671] ? __warn_printk+0xf3/0xf3 [ 62.369308][ T671] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 62.375454][ T671] ? trace_hardirqs_on+0x55/0x220 [ 62.380470][ T671] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.386023][ T671] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.391559][ T671] ? afs_put_call+0xa40/0xa40 [ 62.396232][ T671] end_report+0x4d/0x53 [ 62.400384][ T671] kasan_report.cold+0xd/0x37 [ 62.405058][ T671] ? rcu_read_lock_held_common+0x51/0xa0 [ 62.410785][ T671] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.416342][ T671] afs_wake_up_async_call+0x6aa/0x770 [ 62.421704][ T671] ? afs_close_socket+0x320/0x320 [ 62.426719][ T671] ? afs_put_call+0xa40/0xa40 [ 62.431387][ T671] rxrpc_notify_socket+0x1db/0x5d0 [ 62.436489][ T671] ? afs_put_call+0xa40/0xa40 [ 62.441157][ T671] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.447568][ T671] rxrpc_call_completed+0xca/0xf0 [ 62.452587][ T671] rxrpc_discard_prealloc+0x781/0xab0 [ 62.457955][ T671] ? lock_sock_nested+0x94/0x110 [ 62.462885][ T671] rxrpc_listen+0x147/0x360 [ 62.467379][ T671] afs_close_socket+0x95/0x320 [ 62.472131][ T671] ? afs_purge_servers+0x16d/0x300 [ 62.477231][ T671] ? afs_rx_discard_new_call+0x50/0x50 [ 62.482687][ T671] ? init_wait_var_entry+0x200/0x200 [ 62.487965][ T671] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.493589][ T671] ? check_preemption_disabled+0x38/0x220 [ 62.499299][ T671] afs_net_exit+0x1bc/0x310 [ 62.503792][ T671] ? afs_net_init+0xe30/0xe30 [ 62.508458][ T671] ops_exit_list.isra.0+0xa8/0x150 [ 62.516530][ T671] cleanup_net+0x511/0xa50 [ 62.520937][ T671] ? unregister_pernet_device+0x70/0x70 [ 62.526477][ T671] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.532450][ T671] process_one_work+0x965/0x1690 [ 62.537383][ T671] ? lock_release+0x800/0x800 [ 62.542066][ T671] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.547428][ T671] ? rwlock_bug.part.0+0x90/0x90 [ 62.552359][ T671] worker_thread+0x96/0xe10 [ 62.556861][ T671] ? process_one_work+0x1690/0x1690 [ 62.562050][ T671] kthread+0x3b5/0x4a0 [ 62.566109][ T671] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.571829][ T671] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.577543][ T671] ret_from_fork+0x1f/0x30 [ 62.583156][ T671] Kernel Offset: disabled [ 62.587527][ T671] Rebooting in 86400 seconds..