Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. 2020/06/19 05:10:34 fuzzer started 2020/06/19 05:10:34 connecting to host at 10.128.0.26:40313 2020/06/19 05:10:34 checking machine... 2020/06/19 05:10:34 checking revisions... 2020/06/19 05:10:34 testing simple program... syzkaller login: [ 59.441881][ T6832] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 05:10:34 building call list... [ 59.839632][ T7] tipc: TX() has been purged, node left! [ 60.351946][ T7] ================================================================== [ 60.360216][ T7] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 60.368119][ T7] Write of size 1 at addr ffff88809e5f91e4 by task kworker/u4:0/7 [ 60.375920][ T7] [ 60.378257][ T7] CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc1-syzkaller #0 [ 60.386412][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.396779][ T7] Workqueue: netns cleanup_net [ 60.401532][ T7] Call Trace: [ 60.404829][ T7] dump_stack+0x18f/0x20d [ 60.409160][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.414704][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.420241][ T7] ? afs_put_call+0xa40/0xa40 [ 60.424923][ T7] print_address_description.constprop.0.cold+0xd3/0x413 [ 60.431948][ T7] ? vprintk_func+0x97/0x1a6 [ 60.436538][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.442086][ T7] kasan_report.cold+0x1f/0x37 [ 60.446853][ T7] ? rcu_read_lock_held_common+0x51/0xa0 [ 60.452483][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.458029][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 60.463483][ T7] ? afs_close_socket+0x320/0x320 [ 60.468605][ T7] ? afs_put_call+0xa40/0xa40 [ 60.473548][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 60.478681][ T7] ? afs_put_call+0xa40/0xa40 [ 60.483356][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 60.489772][ T7] rxrpc_call_completed+0xca/0xf0 [ 60.494802][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 60.500182][ T7] ? lock_sock_nested+0x94/0x110 [ 60.505122][ T7] rxrpc_listen+0x147/0x360 [ 60.509629][ T7] afs_close_socket+0x95/0x320 [ 60.514388][ T7] ? afs_purge_servers+0x16d/0x300 [ 60.519502][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 60.524992][ T7] ? init_wait_var_entry+0x200/0x200 [ 60.530280][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 60.535914][ T7] ? check_preemption_disabled+0x38/0x220 [ 60.541648][ T7] afs_net_exit+0x1bc/0x310 [ 60.546759][ T7] ? afs_net_init+0xe30/0xe30 [ 60.552390][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 60.557606][ T7] cleanup_net+0x511/0xa50 [ 60.562305][ T7] ? unregister_pernet_device+0x70/0x70 [ 60.567864][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 60.573942][ T7] process_one_work+0x965/0x1690 [ 60.578889][ T7] ? lock_release+0x800/0x800 [ 60.583740][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 60.589131][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 60.594091][ T7] worker_thread+0x96/0xe10 [ 60.598702][ T7] ? process_one_work+0x1690/0x1690 [ 60.603902][ T7] kthread+0x3b5/0x4a0 [ 60.608058][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 60.613776][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 60.619498][ T7] ret_from_fork+0x1f/0x30 [ 60.623936][ T7] [ 60.626263][ T7] Allocated by task 6832: [ 60.630619][ T7] save_stack+0x1b/0x40 [ 60.634793][ T7] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 60.640426][ T7] kmem_cache_alloc_trace+0x153/0x7d0 [ 60.645792][ T7] afs_alloc_call+0x55/0x630 [ 60.650383][ T7] afs_charge_preallocation+0xe9/0x2d0 [ 60.655841][ T7] afs_open_socket+0x292/0x360 [ 60.660597][ T7] afs_net_init+0xa6c/0xe30 [ 60.665096][ T7] ops_init+0xaf/0x420 [ 60.669158][ T7] setup_net+0x2de/0x860 [ 60.673397][ T7] copy_net_ns+0x293/0x590 [ 60.677812][ T7] create_new_namespaces+0x3fb/0xb30 [ 60.683105][ T7] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 60.688753][ T7] ksys_unshare+0x43d/0x8e0 [ 60.693265][ T7] __x64_sys_unshare+0x2d/0x40 [ 60.698027][ T7] do_syscall_64+0x60/0xe0 [ 60.702452][ T7] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 60.708332][ T7] [ 60.710657][ T7] Freed by task 7: [ 60.715424][ T7] save_stack+0x1b/0x40 [ 60.719576][ T7] __kasan_slab_free+0xf7/0x140 [ 60.724419][ T7] kfree+0x109/0x2b0 [ 60.728307][ T7] afs_put_call+0x585/0xa40 [ 60.732982][ T7] rxrpc_discard_prealloc+0x764/0xab0 [ 60.738349][ T7] rxrpc_listen+0x147/0x360 [ 60.742947][ T7] afs_close_socket+0x95/0x320 [ 60.747703][ T7] afs_net_exit+0x1bc/0x310 [ 60.752219][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 60.757360][ T7] cleanup_net+0x511/0xa50 [ 60.761786][ T7] process_one_work+0x965/0x1690 [ 60.766718][ T7] worker_thread+0x96/0xe10 [ 60.771557][ T7] kthread+0x3b5/0x4a0 [ 60.775646][ T7] ret_from_fork+0x1f/0x30 [ 60.780145][ T7] [ 60.782606][ T7] The buggy address belongs to the object at ffff88809e5f9000 [ 60.782606][ T7] which belongs to the cache kmalloc-1k of size 1024 [ 60.796757][ T7] The buggy address is located 484 bytes inside of [ 60.796757][ T7] 1024-byte region [ffff88809e5f9000, ffff88809e5f9400) [ 60.810256][ T7] The buggy address belongs to the page: [ 60.815918][ T7] page:ffffea0002797e40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 60.825112][ T7] flags: 0xfffe0000000200(slab) [ 60.830003][ T7] raw: 00fffe0000000200 ffffea00027f9a08 ffffea0002868048 ffff8880aa000c40 [ 60.838589][ T7] raw: 0000000000000000 ffff88809e5f9000 0000000100000002 0000000000000000 [ 60.847248][ T7] page dumped because: kasan: bad access detected [ 60.853652][ T7] [ 60.855984][ T7] Memory state around the buggy address: [ 60.861706][ T7] ffff88809e5f9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.869774][ T7] ffff88809e5f9100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.877903][ T7] >ffff88809e5f9180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.886150][ T7] ^ [ 60.894126][ T7] ffff88809e5f9200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.902189][ T7] ffff88809e5f9280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.910345][ T7] ================================================================== [ 60.918398][ T7] Disabling lock debugging due to kernel taint [ 60.924658][ T7] Kernel panic - not syncing: panic_on_warn set ... [ 60.931338][ T7] CPU: 0 PID: 7 Comm: kworker/u4:0 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 60.940874][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.951196][ T7] Workqueue: netns cleanup_net [ 60.955949][ T7] Call Trace: [ 60.959237][ T7] dump_stack+0x18f/0x20d [ 60.963740][ T7] ? afs_wake_up_async_call+0x670/0x770 [ 60.969804][ T7] ? afs_put_call+0xa40/0xa40 [ 60.974475][ T7] panic+0x2e3/0x75c [ 60.978362][ T7] ? __warn_printk+0xf3/0xf3 [ 60.982945][ T7] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 60.989095][ T7] ? trace_hardirqs_on+0x55/0x220 [ 60.994114][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.999653][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.005193][ T7] ? afs_put_call+0xa40/0xa40 [ 61.009866][ T7] end_report+0x4d/0x53 [ 61.014016][ T7] kasan_report.cold+0xd/0x37 [ 61.018692][ T7] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.024342][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.029883][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 61.035246][ T7] ? afs_close_socket+0x320/0x320 [ 61.040279][ T7] ? afs_put_call+0xa40/0xa40 [ 61.045554][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 61.050660][ T7] ? afs_put_call+0xa40/0xa40 [ 61.055329][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.061827][ T7] rxrpc_call_completed+0xca/0xf0 [ 61.066849][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 61.072222][ T7] ? lock_sock_nested+0x94/0x110 [ 61.077151][ T7] rxrpc_listen+0x147/0x360 [ 61.081657][ T7] afs_close_socket+0x95/0x320 [ 61.089020][ T7] ? afs_purge_servers+0x16d/0x300 [ 61.094128][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 61.099583][ T7] ? init_wait_var_entry+0x200/0x200 [ 61.104870][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.110841][ T7] ? check_preemption_disabled+0x38/0x220 [ 61.116554][ T7] afs_net_exit+0x1bc/0x310 [ 61.121049][ T7] ? afs_net_init+0xe30/0xe30 [ 61.125719][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 61.130847][ T7] cleanup_net+0x511/0xa50 [ 61.135266][ T7] ? unregister_pernet_device+0x70/0x70 [ 61.140808][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.147313][ T7] process_one_work+0x965/0x1690 [ 61.152273][ T7] ? lock_release+0x800/0x800 [ 61.156953][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.162405][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 61.167358][ T7] worker_thread+0x96/0xe10 [ 61.171982][ T7] ? process_one_work+0x1690/0x1690 [ 61.177194][ T7] kthread+0x3b5/0x4a0 [ 61.181261][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.186970][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.193115][ T7] ret_from_fork+0x1f/0x30 [ 61.198935][ T7] Kernel Offset: disabled [ 61.203258][ T7] Rebooting in 86400 seconds..