Warning: Permanently added '10.128.15.196' (ECDSA) to the list of known hosts. 2020/06/15 02:07:53 fuzzer started 2020/06/15 02:07:53 connecting to host at 10.128.0.26:41261 2020/06/15 02:07:53 checking machine... 2020/06/15 02:07:53 checking revisions... 2020/06/15 02:07:53 testing simple program... syzkaller login: [ 60.663785][ T6812] IPVS: ftp: loaded support on port[0] = 21 2020/06/15 02:07:54 building call list... [ 60.978345][ T150] tipc: TX() has been purged, node left! [ 61.460583][ T150] ================================================================== [ 61.468814][ T150] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 61.476697][ T150] Write of size 1 at addr ffff8880a01699e4 by task kworker/u4:3/150 [ 61.484657][ T150] [ 61.487073][ T150] CPU: 0 PID: 150 Comm: kworker/u4:3 Not tainted 5.8.0-rc1-next-20200615-syzkaller #0 [ 61.496624][ T150] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.506681][ T150] Workqueue: netns cleanup_net [ 61.511436][ T150] Call Trace: [ 61.514726][ T150] dump_stack+0x18f/0x20d [ 61.519067][ T150] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.524612][ T150] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.530150][ T150] ? afs_put_call+0xa40/0xa40 [ 61.534825][ T150] print_address_description.constprop.0.cold+0xd3/0x413 [ 61.541850][ T150] ? vprintk_func+0x97/0x1a6 [ 61.546443][ T150] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.551994][ T150] kasan_report.cold+0x1f/0x37 [ 61.556758][ T150] ? rcu_read_lock_held_common+0x71/0xa0 [ 61.562431][ T150] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.567979][ T150] afs_wake_up_async_call+0x6aa/0x770 [ 61.573345][ T150] ? afs_close_socket+0x320/0x320 [ 61.578368][ T150] ? afs_put_call+0xa40/0xa40 [ 61.583040][ T150] rxrpc_notify_socket+0x1db/0x5d0 [ 61.588157][ T150] ? afs_put_call+0xa40/0xa40 [ 61.592830][ T150] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.599240][ T150] rxrpc_call_completed+0xca/0xf0 [ 61.604267][ T150] rxrpc_discard_prealloc+0x781/0xab0 [ 61.609639][ T150] ? lock_sock_nested+0x94/0x110 [ 61.614574][ T150] rxrpc_listen+0x147/0x360 [ 61.619111][ T150] afs_close_socket+0x95/0x320 [ 61.624479][ T150] ? afs_purge_servers+0x16d/0x300 [ 61.629591][ T150] ? afs_rx_discard_new_call+0x50/0x50 [ 61.635050][ T150] ? init_wait_var_entry+0x200/0x200 [ 61.640341][ T150] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.645969][ T150] ? check_preemption_disabled+0x38/0x220 [ 61.651708][ T150] afs_net_exit+0x1bc/0x310 [ 61.656217][ T150] ? afs_net_init+0xe30/0xe30 [ 61.660892][ T150] ops_exit_list.isra.0+0xa8/0x150 [ 61.666039][ T150] cleanup_net+0x511/0xa50 [ 61.670476][ T150] ? unregister_pernet_device+0x70/0x70 [ 61.676029][ T150] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.682031][ T150] process_one_work+0x965/0x1690 [ 61.686991][ T150] ? lock_release+0x800/0x800 [ 61.691669][ T150] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.697046][ T150] ? rwlock_bug.part.0+0x90/0x90 [ 61.701999][ T150] worker_thread+0x96/0xe10 [ 61.706517][ T150] ? process_one_work+0x1690/0x1690 [ 61.711714][ T150] kthread+0x3b5/0x4a0 [ 61.715780][ T150] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.721503][ T150] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.727226][ T150] ret_from_fork+0x1f/0x30 [ 61.731651][ T150] [ 61.733973][ T150] Allocated by task 6812: [ 61.738299][ T150] save_stack+0x1b/0x40 [ 61.742464][ T150] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 61.748094][ T150] kmem_cache_alloc_trace+0x153/0x7d0 [ 61.753460][ T150] afs_alloc_call+0x55/0x630 [ 61.758043][ T150] afs_charge_preallocation+0xe9/0x2d0 [ 61.763505][ T150] afs_open_socket+0x292/0x360 [ 61.768264][ T150] afs_net_init+0xa6c/0xe30 [ 61.772762][ T150] ops_init+0xaf/0x420 [ 61.776824][ T150] setup_net+0x2de/0x860 [ 61.781061][ T150] copy_net_ns+0x293/0x590 [ 61.785477][ T150] create_new_namespaces+0x3fb/0xb30 [ 61.790772][ T150] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 61.796398][ T150] ksys_unshare+0x43d/0x8e0 [ 61.800899][ T150] __x64_sys_unshare+0x2d/0x40 [ 61.805657][ T150] do_syscall_64+0x60/0xe0 [ 61.810073][ T150] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.815947][ T150] [ 61.818267][ T150] Freed by task 150: [ 61.822171][ T150] save_stack+0x1b/0x40 [ 61.826322][ T150] __kasan_slab_free+0xf7/0x140 [ 61.831167][ T150] kfree+0x109/0x2b0 [ 61.835065][ T150] afs_put_call+0x585/0xa40 [ 61.839582][ T150] rxrpc_discard_prealloc+0x764/0xab0 [ 61.844949][ T150] rxrpc_listen+0x147/0x360 [ 61.849448][ T150] afs_close_socket+0x95/0x320 [ 61.854207][ T150] afs_net_exit+0x1bc/0x310 [ 61.858703][ T150] ops_exit_list.isra.0+0xa8/0x150 [ 61.863831][ T150] cleanup_net+0x511/0xa50 [ 61.868250][ T150] process_one_work+0x965/0x1690 [ 61.873380][ T150] worker_thread+0x96/0xe10 [ 61.877887][ T150] kthread+0x3b5/0x4a0 [ 61.881954][ T150] ret_from_fork+0x1f/0x30 [ 61.886480][ T150] [ 61.888821][ T150] The buggy address belongs to the object at ffff8880a0169800 [ 61.888821][ T150] which belongs to the cache kmalloc-1k of size 1024 [ 61.902901][ T150] The buggy address is located 484 bytes inside of [ 61.902901][ T150] 1024-byte region [ffff8880a0169800, ffff8880a0169c00) [ 61.916268][ T150] The buggy address belongs to the page: [ 61.921941][ T150] page:ffffea0002805a40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 61.931042][ T150] flags: 0xfffe0000000200(slab) [ 61.935894][ T150] raw: 00fffe0000000200 ffffea000280bb48 ffffea0002805cc8 ffff8880aa000c40 [ 61.944522][ T150] raw: 0000000000000000 ffff8880a0169000 0000000100000002 0000000000000000 [ 61.953138][ T150] page dumped because: kasan: bad access detected [ 61.959610][ T150] [ 61.961956][ T150] Memory state around the buggy address: [ 61.967594][ T150] ffff8880a0169880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.975655][ T150] ffff8880a0169900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.983723][ T150] >ffff8880a0169980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.991781][ T150] ^ [ 61.998969][ T150] ffff8880a0169a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.007022][ T150] ffff8880a0169a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.015076][ T150] ================================================================== [ 62.023130][ T150] Disabling lock debugging due to kernel taint [ 62.029318][ T150] Kernel panic - not syncing: panic_on_warn set ... [ 62.035899][ T150] CPU: 0 PID: 150 Comm: kworker/u4:3 Tainted: G B 5.8.0-rc1-next-20200615-syzkaller #0 [ 62.046819][ T150] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.056970][ T150] Workqueue: netns cleanup_net [ 62.061732][ T150] Call Trace: [ 62.065030][ T150] dump_stack+0x18f/0x20d [ 62.069360][ T150] ? afs_wake_up_async_call+0x660/0x770 [ 62.074898][ T150] ? afs_put_call+0xa40/0xa40 [ 62.079571][ T150] panic+0x2e3/0x75c [ 62.083460][ T150] ? __warn_printk+0xf3/0xf3 [ 62.088045][ T150] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 62.094199][ T150] ? trace_hardirqs_on+0x55/0x220 [ 62.099222][ T150] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.104759][ T150] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.110292][ T150] ? afs_put_call+0xa40/0xa40 [ 62.115082][ T150] end_report+0x4d/0x53 [ 62.119236][ T150] kasan_report.cold+0xd/0x37 [ 62.123931][ T150] ? rcu_read_lock_held_common+0x71/0xa0 [ 62.129559][ T150] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.135097][ T150] afs_wake_up_async_call+0x6aa/0x770 [ 62.140462][ T150] ? afs_close_socket+0x320/0x320 [ 62.145478][ T150] ? afs_put_call+0xa40/0xa40 [ 62.150192][ T150] rxrpc_notify_socket+0x1db/0x5d0 [ 62.155302][ T150] ? afs_put_call+0xa40/0xa40 [ 62.159974][ T150] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.166479][ T150] rxrpc_call_completed+0xca/0xf0 [ 62.171498][ T150] rxrpc_discard_prealloc+0x781/0xab0 [ 62.176867][ T150] ? lock_sock_nested+0x94/0x110 [ 62.181797][ T150] rxrpc_listen+0x147/0x360 [ 62.186298][ T150] afs_close_socket+0x95/0x320 [ 62.191187][ T150] ? afs_purge_servers+0x16d/0x300 [ 62.196300][ T150] ? afs_rx_discard_new_call+0x50/0x50 [ 62.201757][ T150] ? init_wait_var_entry+0x200/0x200 [ 62.207046][ T150] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.212675][ T150] ? check_preemption_disabled+0x38/0x220 [ 62.218392][ T150] afs_net_exit+0x1bc/0x310 [ 62.222886][ T150] ? afs_net_init+0xe30/0xe30 [ 62.227555][ T150] ops_exit_list.isra.0+0xa8/0x150 [ 62.232661][ T150] cleanup_net+0x511/0xa50 [ 62.237072][ T150] ? unregister_pernet_device+0x70/0x70 [ 62.242613][ T150] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.248589][ T150] process_one_work+0x965/0x1690 [ 62.253525][ T150] ? lock_release+0x800/0x800 [ 62.258198][ T150] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.263564][ T150] ? rwlock_bug.part.0+0x90/0x90 [ 62.268498][ T150] worker_thread+0x96/0xe10 [ 62.273122][ T150] ? process_one_work+0x1690/0x1690 [ 62.278311][ T150] kthread+0x3b5/0x4a0 [ 62.282375][ T150] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.288084][ T150] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.293797][ T150] ret_from_fork+0x1f/0x30 [ 62.299609][ T150] Kernel Offset: disabled [ 62.304186][ T150] Rebooting in 86400 seconds..