Warning: Permanently added '10.128.15.208' (ECDSA) to the list of known hosts. 2020/06/19 17:50:37 fuzzer started 2020/06/19 17:50:38 connecting to host at 10.128.0.26:41433 2020/06/19 17:50:38 checking machine... 2020/06/19 17:50:38 checking revisions... 2020/06/19 17:50:38 testing simple program... syzkaller login: [ 60.586404][ T6801] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 17:50:38 building call list... [ 60.930427][ T130] tipc: TX() has been purged, node left! [ 61.463651][ T130] ================================================================== [ 61.471890][ T130] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 61.479858][ T130] Write of size 1 at addr ffff888092ce09e4 by task kworker/u4:4/130 [ 61.487822][ T130] [ 61.490154][ T130] CPU: 0 PID: 130 Comm: kworker/u4:4 Not tainted 5.8.0-rc1-syzkaller #0 [ 61.498485][ T130] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.508554][ T130] Workqueue: netns cleanup_net [ 61.513308][ T130] Call Trace: [ 61.516596][ T130] dump_stack+0x18f/0x20d [ 61.520929][ T130] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.526472][ T130] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.532010][ T130] ? afs_put_call+0xa40/0xa40 [ 61.536684][ T130] print_address_description.constprop.0.cold+0xd3/0x413 [ 61.543710][ T130] ? vprintk_func+0x97/0x1a6 [ 61.548308][ T130] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.553848][ T130] kasan_report.cold+0x1f/0x37 [ 61.558611][ T130] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.564238][ T130] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.569780][ T130] afs_wake_up_async_call+0x6aa/0x770 [ 61.575174][ T130] ? afs_close_socket+0x320/0x320 [ 61.580204][ T130] ? afs_put_call+0xa40/0xa40 [ 61.584876][ T130] rxrpc_notify_socket+0x1db/0x5d0 [ 61.589988][ T130] ? afs_put_call+0xa40/0xa40 [ 61.594669][ T130] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.601084][ T130] rxrpc_call_completed+0xca/0xf0 [ 61.606113][ T130] rxrpc_discard_prealloc+0x781/0xab0 [ 61.611487][ T130] ? lock_sock_nested+0x94/0x110 [ 61.616426][ T130] rxrpc_listen+0x147/0x360 [ 61.620948][ T130] afs_close_socket+0x95/0x320 [ 61.625723][ T130] ? afs_purge_servers+0x16d/0x300 [ 61.630833][ T130] ? afs_rx_discard_new_call+0x50/0x50 [ 61.636295][ T130] ? init_wait_var_entry+0x200/0x200 [ 61.641588][ T130] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.647241][ T130] ? check_preemption_disabled+0x38/0x220 [ 61.652961][ T130] afs_net_exit+0x1bc/0x310 [ 61.657465][ T130] ? afs_net_init+0xe30/0xe30 [ 61.662151][ T130] ops_exit_list.isra.0+0xa8/0x150 [ 61.667262][ T130] cleanup_net+0x511/0xa50 [ 61.671706][ T130] ? unregister_pernet_device+0x70/0x70 [ 61.677251][ T130] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.683239][ T130] process_one_work+0x965/0x1690 [ 61.688205][ T130] ? lock_release+0x800/0x800 [ 61.692878][ T130] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.698252][ T130] ? rwlock_bug.part.0+0x90/0x90 [ 61.703215][ T130] worker_thread+0x96/0xe10 [ 61.707729][ T130] ? process_one_work+0x1690/0x1690 [ 61.712926][ T130] kthread+0x3b5/0x4a0 [ 61.716992][ T130] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.722713][ T130] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.728432][ T130] ret_from_fork+0x1f/0x30 [ 61.732866][ T130] [ 61.735204][ T130] Allocated by task 6801: [ 61.739531][ T130] save_stack+0x1b/0x40 [ 61.743685][ T130] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 61.749312][ T130] kmem_cache_alloc_trace+0x153/0x7d0 [ 61.754682][ T130] afs_alloc_call+0x55/0x630 [ 61.759264][ T130] afs_charge_preallocation+0xe9/0x2d0 [ 61.764801][ T130] afs_open_socket+0x292/0x360 [ 61.769555][ T130] afs_net_init+0xa6c/0xe30 [ 61.774051][ T130] ops_init+0xaf/0x420 [ 61.778113][ T130] setup_net+0x2de/0x860 [ 61.782351][ T130] copy_net_ns+0x293/0x590 [ 61.787023][ T130] create_new_namespaces+0x3fb/0xb30 [ 61.792305][ T130] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 61.797933][ T130] ksys_unshare+0x43d/0x8e0 [ 61.802434][ T130] __x64_sys_unshare+0x2d/0x40 [ 61.807192][ T130] do_syscall_64+0x60/0xe0 [ 61.811605][ T130] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.817487][ T130] [ 61.819806][ T130] Freed by task 130: [ 61.823697][ T130] save_stack+0x1b/0x40 [ 61.827853][ T130] __kasan_slab_free+0xf7/0x140 [ 61.832694][ T130] kfree+0x109/0x2b0 [ 61.836585][ T130] afs_put_call+0x585/0xa40 [ 61.841095][ T130] rxrpc_discard_prealloc+0x764/0xab0 [ 61.846547][ T130] rxrpc_listen+0x147/0x360 [ 61.851043][ T130] afs_close_socket+0x95/0x320 [ 61.855802][ T130] afs_net_exit+0x1bc/0x310 [ 61.860302][ T130] ops_exit_list.isra.0+0xa8/0x150 [ 61.865438][ T130] cleanup_net+0x511/0xa50 [ 61.869876][ T130] process_one_work+0x965/0x1690 [ 61.874825][ T130] worker_thread+0x96/0xe10 [ 61.879332][ T130] kthread+0x3b5/0x4a0 [ 61.883397][ T130] ret_from_fork+0x1f/0x30 [ 61.887800][ T130] [ 61.890126][ T130] The buggy address belongs to the object at ffff888092ce0800 [ 61.890126][ T130] which belongs to the cache kmalloc-1k of size 1024 [ 61.904200][ T130] The buggy address is located 484 bytes inside of [ 61.904200][ T130] 1024-byte region [ffff888092ce0800, ffff888092ce0c00) [ 61.917559][ T130] The buggy address belongs to the page: [ 61.923192][ T130] page:ffffea00024b3800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 61.932291][ T130] flags: 0xfffe0000000200(slab) [ 61.937183][ T130] raw: 00fffe0000000200 ffffea00027e7f48 ffffea00027cb3c8 ffff8880aa000c40 [ 61.945769][ T130] raw: 0000000000000000 ffff888092ce0000 0000000100000002 0000000000000000 [ 61.954344][ T130] page dumped because: kasan: bad access detected [ 61.960742][ T130] [ 61.963060][ T130] Memory state around the buggy address: [ 61.968685][ T130] ffff888092ce0880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.976761][ T130] ffff888092ce0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.984843][ T130] >ffff888092ce0980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.992914][ T130] ^ [ 62.000134][ T130] ffff888092ce0a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.008229][ T130] ffff888092ce0a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.016540][ T130] ================================================================== [ 62.024592][ T130] Disabling lock debugging due to kernel taint [ 62.030785][ T130] Kernel panic - not syncing: panic_on_warn set ... [ 62.037370][ T130] CPU: 0 PID: 130 Comm: kworker/u4:4 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 62.047068][ T130] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.057121][ T130] Workqueue: netns cleanup_net [ 62.061879][ T130] Call Trace: [ 62.065168][ T130] dump_stack+0x18f/0x20d [ 62.069497][ T130] ? afs_wake_up_async_call+0x680/0x770 [ 62.075033][ T130] ? afs_put_call+0xa40/0xa40 [ 62.079703][ T130] panic+0x2e3/0x75c [ 62.083603][ T130] ? __warn_printk+0xf3/0xf3 [ 62.088198][ T130] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 62.094355][ T130] ? trace_hardirqs_on+0x55/0x220 [ 62.099370][ T130] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.104911][ T130] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.110447][ T130] ? afs_put_call+0xa40/0xa40 [ 62.115135][ T130] end_report+0x4d/0x53 [ 62.119285][ T130] kasan_report.cold+0xd/0x37 [ 62.123958][ T130] ? rcu_read_lock_held_common+0x51/0xa0 [ 62.129578][ T130] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.135118][ T130] afs_wake_up_async_call+0x6aa/0x770 [ 62.140481][ T130] ? afs_close_socket+0x320/0x320 [ 62.145500][ T130] ? afs_put_call+0xa40/0xa40 [ 62.150196][ T130] rxrpc_notify_socket+0x1db/0x5d0 [ 62.155305][ T130] ? afs_put_call+0xa40/0xa40 [ 62.159975][ T130] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.166385][ T130] rxrpc_call_completed+0xca/0xf0 [ 62.171414][ T130] rxrpc_discard_prealloc+0x781/0xab0 [ 62.176781][ T130] ? lock_sock_nested+0x94/0x110 [ 62.181713][ T130] rxrpc_listen+0x147/0x360 [ 62.186228][ T130] afs_close_socket+0x95/0x320 [ 62.190984][ T130] ? afs_purge_servers+0x16d/0x300 [ 62.196088][ T130] ? afs_rx_discard_new_call+0x50/0x50 [ 62.201541][ T130] ? init_wait_var_entry+0x200/0x200 [ 62.206823][ T130] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.212463][ T130] ? check_preemption_disabled+0x38/0x220 [ 62.218190][ T130] afs_net_exit+0x1bc/0x310 [ 62.222712][ T130] ? afs_net_init+0xe30/0xe30 [ 62.227384][ T130] ops_exit_list.isra.0+0xa8/0x150 [ 62.232496][ T130] cleanup_net+0x511/0xa50 [ 62.236910][ T130] ? unregister_pernet_device+0x70/0x70 [ 62.242452][ T130] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.248432][ T130] process_one_work+0x965/0x1690 [ 62.253372][ T130] ? lock_release+0x800/0x800 [ 62.258044][ T130] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.263408][ T130] ? rwlock_bug.part.0+0x90/0x90 [ 62.268342][ T130] worker_thread+0x96/0xe10 [ 62.272842][ T130] ? process_one_work+0x1690/0x1690 [ 62.278031][ T130] kthread+0x3b5/0x4a0 [ 62.282104][ T130] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.287814][ T130] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.293527][ T130] ret_from_fork+0x1f/0x30 [ 62.299332][ T130] Kernel Offset: disabled [ 62.303650][ T130] Rebooting in 86400 seconds..