Warning: Permanently added '10.128.0.154' (ECDSA) to the list of known hosts. 2020/06/19 07:13:59 fuzzer started 2020/06/19 07:13:59 connecting to host at 10.128.0.26:38287 2020/06/19 07:13:59 checking machine... 2020/06/19 07:13:59 checking revisions... 2020/06/19 07:13:59 testing simple program... syzkaller login: [ 62.415424][ T6821] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 07:13:59 building call list... [ 62.831037][ T21] tipc: TX() has been purged, node left! [ 63.343130][ T21] ================================================================== [ 63.351857][ T21] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 63.360221][ T21] Write of size 1 at addr ffff88808ddf79e4 by task kworker/u4:1/21 [ 63.368435][ T21] [ 63.370796][ T21] CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.8.0-rc1-syzkaller #0 [ 63.379210][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.394508][ T21] Workqueue: netns cleanup_net [ 63.403380][ T21] Call Trace: [ 63.406810][ T21] dump_stack+0x18f/0x20d [ 63.411766][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.417318][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.423291][ T21] ? afs_put_call+0xa40/0xa40 [ 63.428127][ T21] print_address_description.constprop.0.cold+0xd3/0x413 [ 63.435731][ T21] ? vprintk_func+0x97/0x1a6 [ 63.440458][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.446265][ T21] kasan_report.cold+0x1f/0x37 [ 63.451144][ T21] ? rcu_read_lock_held_common+0x51/0xa0 [ 63.456800][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.462701][ T21] afs_wake_up_async_call+0x6aa/0x770 [ 63.468226][ T21] ? afs_close_socket+0x320/0x320 [ 63.473356][ T21] ? afs_put_call+0xa40/0xa40 [ 63.478215][ T21] rxrpc_notify_socket+0x1db/0x5d0 [ 63.483350][ T21] ? afs_put_call+0xa40/0xa40 [ 63.489014][ T21] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 63.497183][ T21] rxrpc_call_completed+0xca/0xf0 [ 63.502242][ T21] rxrpc_discard_prealloc+0x781/0xab0 [ 63.507685][ T21] ? lock_sock_nested+0x94/0x110 [ 63.513068][ T21] rxrpc_listen+0x147/0x360 [ 63.517980][ T21] afs_close_socket+0x95/0x320 [ 63.522938][ T21] ? afs_purge_servers+0x16d/0x300 [ 63.528192][ T21] ? afs_rx_discard_new_call+0x50/0x50 [ 63.533762][ T21] ? init_wait_var_entry+0x200/0x200 [ 63.539063][ T21] ? rcu_read_lock_held_common+0xa0/0xa0 [ 63.545121][ T21] ? check_preemption_disabled+0x38/0x220 [ 63.550878][ T21] afs_net_exit+0x1bc/0x310 [ 63.555483][ T21] ? afs_net_init+0xe30/0xe30 [ 63.560175][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 63.565302][ T21] cleanup_net+0x511/0xa50 [ 63.569738][ T21] ? unregister_pernet_device+0x70/0x70 [ 63.575522][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.582323][ T21] process_one_work+0x965/0x1690 [ 63.587620][ T21] ? lock_release+0x800/0x800 [ 63.592337][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 63.597725][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 63.602867][ T21] worker_thread+0x96/0xe10 [ 63.607505][ T21] ? process_one_work+0x1690/0x1690 [ 63.612714][ T21] kthread+0x3b5/0x4a0 [ 63.616845][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.623826][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.629570][ T21] ret_from_fork+0x1f/0x30 [ 63.634134][ T21] [ 63.636545][ T21] Allocated by task 6821: [ 63.641532][ T21] save_stack+0x1b/0x40 [ 63.645692][ T21] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 63.651351][ T21] kmem_cache_alloc_trace+0x153/0x7d0 [ 63.656727][ T21] afs_alloc_call+0x55/0x630 [ 63.661416][ T21] afs_charge_preallocation+0xe9/0x2d0 [ 63.666885][ T21] afs_open_socket+0x292/0x360 [ 63.671708][ T21] afs_net_init+0xa6c/0xe30 [ 63.676652][ T21] ops_init+0xaf/0x420 [ 63.680932][ T21] setup_net+0x2de/0x860 [ 63.685644][ T21] copy_net_ns+0x293/0x590 [ 63.690770][ T21] create_new_namespaces+0x3fb/0xb30 [ 63.696671][ T21] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 63.702619][ T21] ksys_unshare+0x43d/0x8e0 [ 63.707158][ T21] __x64_sys_unshare+0x2d/0x40 [ 63.711932][ T21] do_syscall_64+0x60/0xe0 [ 63.716494][ T21] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 63.722478][ T21] [ 63.724896][ T21] Freed by task 21: [ 63.728717][ T21] save_stack+0x1b/0x40 [ 63.732886][ T21] __kasan_slab_free+0xf7/0x140 [ 63.738184][ T21] kfree+0x109/0x2b0 [ 63.742256][ T21] afs_put_call+0x585/0xa40 [ 63.747375][ T21] rxrpc_discard_prealloc+0x764/0xab0 [ 63.753102][ T21] rxrpc_listen+0x147/0x360 [ 63.757621][ T21] afs_close_socket+0x95/0x320 [ 63.762655][ T21] afs_net_exit+0x1bc/0x310 [ 63.767342][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 63.772685][ T21] cleanup_net+0x511/0xa50 [ 63.782079][ T21] process_one_work+0x965/0x1690 [ 63.787463][ T21] worker_thread+0x96/0xe10 [ 63.793456][ T21] kthread+0x3b5/0x4a0 [ 63.798737][ T21] ret_from_fork+0x1f/0x30 [ 63.803258][ T21] [ 63.805757][ T21] The buggy address belongs to the object at ffff88808ddf7800 [ 63.805757][ T21] which belongs to the cache kmalloc-1k of size 1024 [ 63.823721][ T21] The buggy address is located 484 bytes inside of [ 63.823721][ T21] 1024-byte region [ffff88808ddf7800, ffff88808ddf7c00) [ 63.843398][ T21] The buggy address belongs to the page: [ 63.850467][ T21] page:ffffea0002377dc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 63.860794][ T21] flags: 0xfffe0000000200(slab) [ 63.865665][ T21] raw: 00fffe0000000200 ffffea000254ee48 ffffea0002540dc8 ffff8880aa000c40 [ 63.874529][ T21] raw: 0000000000000000 ffff88808ddf7000 0000000100000002 0000000000000000 [ 63.883751][ T21] page dumped because: kasan: bad access detected [ 63.891307][ T21] [ 63.894284][ T21] Memory state around the buggy address: [ 63.900720][ T21] ffff88808ddf7880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.912366][ T21] ffff88808ddf7900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.921836][ T21] >ffff88808ddf7980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.930119][ T21] ^ [ 63.937982][ T21] ffff88808ddf7a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.946240][ T21] ffff88808ddf7a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.954445][ T21] ================================================================== [ 63.963306][ T21] Disabling lock debugging due to kernel taint [ 63.970630][ T21] Kernel panic - not syncing: panic_on_warn set ... [ 63.977578][ T21] CPU: 1 PID: 21 Comm: kworker/u4:1 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 63.987384][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.998463][ T21] Workqueue: netns cleanup_net [ 64.003449][ T21] Call Trace: [ 64.006751][ T21] dump_stack+0x18f/0x20d [ 64.011100][ T21] ? afs_wake_up_async_call+0x670/0x770 [ 64.016649][ T21] ? afs_put_call+0xa40/0xa40 [ 64.021416][ T21] panic+0x2e3/0x75c [ 64.025331][ T21] ? __warn_printk+0xf3/0xf3 [ 64.030762][ T21] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 64.037071][ T21] ? trace_hardirqs_on+0x55/0x220 [ 64.042277][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.048362][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.054083][ T21] ? afs_put_call+0xa40/0xa40 [ 64.059067][ T21] end_report+0x4d/0x53 [ 64.063247][ T21] kasan_report.cold+0xd/0x37 [ 64.068147][ T21] ? rcu_read_lock_held_common+0x51/0xa0 [ 64.073986][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.079546][ T21] afs_wake_up_async_call+0x6aa/0x770 [ 64.085011][ T21] ? afs_close_socket+0x320/0x320 [ 64.090822][ T21] ? afs_put_call+0xa40/0xa40 [ 64.095632][ T21] rxrpc_notify_socket+0x1db/0x5d0 [ 64.100757][ T21] ? afs_put_call+0xa40/0xa40 [ 64.105691][ T21] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 64.112334][ T21] rxrpc_call_completed+0xca/0xf0 [ 64.117750][ T21] rxrpc_discard_prealloc+0x781/0xab0 [ 64.123218][ T21] ? lock_sock_nested+0x94/0x110 [ 64.128338][ T21] rxrpc_listen+0x147/0x360 [ 64.132849][ T21] afs_close_socket+0x95/0x320 [ 64.138972][ T21] ? afs_purge_servers+0x16d/0x300 [ 64.144178][ T21] ? afs_rx_discard_new_call+0x50/0x50 [ 64.149742][ T21] ? init_wait_var_entry+0x200/0x200 [ 64.155126][ T21] ? rcu_read_lock_held_common+0xa0/0xa0 [ 64.160905][ T21] ? check_preemption_disabled+0x38/0x220 [ 64.166628][ T21] afs_net_exit+0x1bc/0x310 [ 64.171135][ T21] ? afs_net_init+0xe30/0xe30 [ 64.176007][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 64.181129][ T21] cleanup_net+0x511/0xa50 [ 64.185742][ T21] ? unregister_pernet_device+0x70/0x70 [ 64.191317][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.197320][ T21] process_one_work+0x965/0x1690 [ 64.202279][ T21] ? lock_release+0x800/0x800 [ 64.209371][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 64.214887][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 64.219858][ T21] worker_thread+0x96/0xe10 [ 64.225240][ T21] ? process_one_work+0x1690/0x1690 [ 64.233062][ T21] kthread+0x3b5/0x4a0 [ 64.237433][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.243465][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.249503][ T21] ret_from_fork+0x1f/0x30 [ 64.255238][ T21] Kernel Offset: disabled [ 64.260154][ T21] Rebooting in 86400 seconds..