Warning: Permanently added '10.128.10.2' (ECDSA) to the list of known hosts. 2020/06/18 09:10:52 fuzzer started 2020/06/18 09:10:52 connecting to host at 10.128.0.26:44751 2020/06/18 09:10:52 checking machine... 2020/06/18 09:10:52 checking revisions... 2020/06/18 09:10:52 testing simple program... syzkaller login: [ 60.252746][ T6811] IPVS: ftp: loaded support on port[0] = 21 2020/06/18 09:10:53 building call list... [ 60.562177][ T7] tipc: TX() has been purged, node left! [ 61.094234][ T7] ================================================================== [ 61.102459][ T7] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 61.110347][ T7] Write of size 1 at addr ffff88809154b9e4 by task kworker/u4:0/7 [ 61.118133][ T7] [ 61.120472][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc1-syzkaller #0 [ 61.128611][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.139624][ T7] Workqueue: netns cleanup_net [ 61.144405][ T7] Call Trace: [ 61.147700][ T7] dump_stack+0x18f/0x20d [ 61.152032][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.157573][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.163113][ T7] ? afs_put_call+0xa40/0xa40 [ 61.167789][ T7] print_address_description.constprop.0.cold+0xd3/0x413 [ 61.174905][ T7] ? vprintk_func+0x97/0x1a6 [ 61.179512][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.185054][ T7] kasan_report.cold+0x1f/0x37 [ 61.189822][ T7] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.195607][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.201190][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 61.206585][ T7] ? afs_close_socket+0x320/0x320 [ 61.211641][ T7] ? afs_put_call+0xa40/0xa40 [ 61.216320][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 61.221436][ T7] ? afs_put_call+0xa40/0xa40 [ 61.226109][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.232527][ T7] rxrpc_call_completed+0xca/0xf0 [ 61.237557][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 61.243086][ T7] ? lock_sock_nested+0x94/0x110 [ 61.248125][ T7] rxrpc_listen+0x147/0x360 [ 61.252633][ T7] afs_close_socket+0x95/0x320 [ 61.257423][ T7] ? afs_purge_servers+0x16d/0x300 [ 61.262625][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 61.268105][ T7] ? init_wait_var_entry+0x200/0x200 [ 61.273393][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.279150][ T7] ? check_preemption_disabled+0x38/0x220 [ 61.284899][ T7] afs_net_exit+0x1bc/0x310 [ 61.289404][ T7] ? afs_net_init+0xe30/0xe30 [ 61.294081][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 61.299194][ T7] cleanup_net+0x511/0xa50 [ 61.303624][ T7] ? unregister_pernet_device+0x70/0x70 [ 61.309265][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.315271][ T7] process_one_work+0x965/0x1690 [ 61.320220][ T7] ? lock_release+0x800/0x800 [ 61.324897][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.330795][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 61.335919][ T7] worker_thread+0x96/0xe10 [ 61.340789][ T7] ? process_one_work+0x1690/0x1690 [ 61.346520][ T7] kthread+0x3b5/0x4a0 [ 61.350598][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.356487][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.362209][ T7] ret_from_fork+0x1f/0x30 [ 61.366639][ T7] [ 61.369148][ T7] Allocated by task 6811: [ 61.373492][ T7] save_stack+0x1b/0x40 [ 61.377644][ T7] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 61.383278][ T7] kmem_cache_alloc_trace+0x153/0x7d0 [ 61.388658][ T7] afs_alloc_call+0x55/0x630 [ 61.393272][ T7] afs_charge_preallocation+0xe9/0x2d0 [ 61.398728][ T7] afs_open_socket+0x292/0x360 [ 61.405083][ T7] afs_net_init+0xa6c/0xe30 [ 61.409669][ T7] ops_init+0xaf/0x420 [ 61.413734][ T7] setup_net+0x2de/0x860 [ 61.417973][ T7] copy_net_ns+0x293/0x590 [ 61.422402][ T7] create_new_namespaces+0x3fb/0xb30 [ 61.427685][ T7] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 61.433581][ T7] ksys_unshare+0x43d/0x8e0 [ 61.438169][ T7] __x64_sys_unshare+0x2d/0x40 [ 61.442934][ T7] do_syscall_64+0x60/0xe0 [ 61.447352][ T7] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.453229][ T7] [ 61.455550][ T7] Freed by task 7: [ 61.459285][ T7] save_stack+0x1b/0x40 [ 61.463437][ T7] __kasan_slab_free+0xf7/0x140 [ 61.468282][ T7] kfree+0x109/0x2b0 [ 61.472174][ T7] afs_put_call+0x585/0xa40 [ 61.476679][ T7] rxrpc_discard_prealloc+0x764/0xab0 [ 61.482143][ T7] rxrpc_listen+0x147/0x360 [ 61.486663][ T7] afs_close_socket+0x95/0x320 [ 61.491681][ T7] afs_net_exit+0x1bc/0x310 [ 61.496183][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 61.501286][ T7] cleanup_net+0x511/0xa50 [ 61.505700][ T7] process_one_work+0x965/0x1690 [ 61.510662][ T7] worker_thread+0x96/0xe10 [ 61.515172][ T7] kthread+0x3b5/0x4a0 [ 61.519276][ T7] ret_from_fork+0x1f/0x30 [ 61.523723][ T7] [ 61.526087][ T7] The buggy address belongs to the object at ffff88809154b800 [ 61.526087][ T7] which belongs to the cache kmalloc-1k of size 1024 [ 61.540243][ T7] The buggy address is located 484 bytes inside of [ 61.540243][ T7] 1024-byte region [ffff88809154b800, ffff88809154bc00) [ 61.554868][ T7] The buggy address belongs to the page: [ 61.560643][ T7] page:ffffea00024552c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 61.569849][ T7] flags: 0xfffe0000000200(slab) [ 61.574846][ T7] raw: 00fffe0000000200 ffffea00028cf188 ffffea000248e5c8 ffff8880aa000c40 [ 61.583536][ T7] raw: 0000000000000000 ffff88809154b000 0000000100000002 0000000000000000 [ 61.592296][ T7] page dumped because: kasan: bad access detected [ 61.598814][ T7] [ 61.601320][ T7] Memory state around the buggy address: [ 61.606954][ T7] ffff88809154b880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.615106][ T7] ffff88809154b900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.623203][ T7] >ffff88809154b980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.631282][ T7] ^ [ 61.638501][ T7] ffff88809154ba00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.646997][ T7] ffff88809154ba80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.655061][ T7] ================================================================== [ 61.663120][ T7] Disabling lock debugging due to kernel taint [ 61.669410][ T7] Kernel panic - not syncing: panic_on_warn set ... [ 61.675999][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 61.685729][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.695780][ T7] Workqueue: netns cleanup_net [ 61.700550][ T7] Call Trace: [ 61.703934][ T7] dump_stack+0x18f/0x20d [ 61.708355][ T7] ? afs_wake_up_async_call+0x670/0x770 [ 61.713894][ T7] ? afs_put_call+0xa40/0xa40 [ 61.718586][ T7] panic+0x2e3/0x75c [ 61.722478][ T7] ? __warn_printk+0xf3/0xf3 [ 61.727062][ T7] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 61.733212][ T7] ? trace_hardirqs_on+0x55/0x220 [ 61.738337][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.743892][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.749513][ T7] ? afs_put_call+0xa40/0xa40 [ 61.754182][ T7] end_report+0x4d/0x53 [ 61.758425][ T7] kasan_report.cold+0xd/0x37 [ 61.763101][ T7] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.768902][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.774615][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 61.779979][ T7] ? afs_close_socket+0x320/0x320 [ 61.785025][ T7] ? afs_put_call+0xa40/0xa40 [ 61.789701][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 61.794804][ T7] ? afs_put_call+0xa40/0xa40 [ 61.799477][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.805885][ T7] rxrpc_call_completed+0xca/0xf0 [ 61.810909][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 61.816298][ T7] ? lock_sock_nested+0x94/0x110 [ 61.821249][ T7] rxrpc_listen+0x147/0x360 [ 61.825778][ T7] afs_close_socket+0x95/0x320 [ 61.830543][ T7] ? afs_purge_servers+0x16d/0x300 [ 61.835735][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 61.841189][ T7] ? init_wait_var_entry+0x200/0x200 [ 61.846561][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.852361][ T7] ? check_preemption_disabled+0x38/0x220 [ 61.858071][ T7] afs_net_exit+0x1bc/0x310 [ 61.862586][ T7] ? afs_net_init+0xe30/0xe30 [ 61.867251][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 61.872355][ T7] cleanup_net+0x511/0xa50 [ 61.876767][ T7] ? unregister_pernet_device+0x70/0x70 [ 61.882393][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.888394][ T7] process_one_work+0x965/0x1690 [ 61.893352][ T7] ? lock_release+0x800/0x800 [ 61.898118][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.903483][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 61.908420][ T7] worker_thread+0x96/0xe10 [ 61.913008][ T7] ? process_one_work+0x1690/0x1690 [ 61.918204][ T7] kthread+0x3b5/0x4a0 [ 61.922264][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.928061][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.934114][ T7] ret_from_fork+0x1f/0x30 [ 61.939992][ T7] Kernel Offset: disabled [ 61.944341][ T7] Rebooting in 86400 seconds..