Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.205' (ECDSA) to the list of known hosts. 2020/06/19 02:39:12 fuzzer started 2020/06/19 02:39:12 connecting to host at 10.128.0.26:37021 2020/06/19 02:39:12 checking machine... 2020/06/19 02:39:12 checking revisions... 2020/06/19 02:39:12 testing simple program... syzkaller login: [ 60.300666][ T6813] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 02:39:12 building call list... [ 60.675160][ T87] tipc: TX() has been purged, node left! [ 61.187343][ T87] ================================================================== [ 61.196023][ T87] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 61.203909][ T87] Write of size 1 at addr ffff8880a37e41e4 by task kworker/u4:3/87 [ 61.211783][ T87] [ 61.214112][ T87] CPU: 1 PID: 87 Comm: kworker/u4:3 Not tainted 5.8.0-rc1-syzkaller #0 [ 61.222520][ T87] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.232583][ T87] Workqueue: netns cleanup_net [ 61.237340][ T87] Call Trace: [ 61.240631][ T87] dump_stack+0x18f/0x20d [ 61.246290][ T87] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.251918][ T87] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.257461][ T87] ? afs_put_call+0xa40/0xa40 [ 61.262137][ T87] print_address_description.constprop.0.cold+0xd3/0x413 [ 61.269204][ T87] ? vprintk_func+0x97/0x1a6 [ 61.273797][ T87] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.279948][ T87] kasan_report.cold+0x1f/0x37 [ 61.284713][ T87] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.290442][ T87] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.295988][ T87] afs_wake_up_async_call+0x6aa/0x770 [ 61.301527][ T87] ? afs_close_socket+0x320/0x320 [ 61.306551][ T87] ? afs_put_call+0xa40/0xa40 [ 61.311234][ T87] rxrpc_notify_socket+0x1db/0x5d0 [ 61.316359][ T87] ? afs_put_call+0xa40/0xa40 [ 61.321689][ T87] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.328101][ T87] rxrpc_call_completed+0xca/0xf0 [ 61.333217][ T87] rxrpc_discard_prealloc+0x781/0xab0 [ 61.338590][ T87] ? lock_sock_nested+0x94/0x110 [ 61.343529][ T87] rxrpc_listen+0x147/0x360 [ 61.348038][ T87] afs_close_socket+0x95/0x320 [ 61.352793][ T87] ? afs_purge_servers+0x16d/0x300 [ 61.358252][ T87] ? afs_rx_discard_new_call+0x50/0x50 [ 61.363711][ T87] ? init_wait_var_entry+0x200/0x200 [ 61.368995][ T87] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.374623][ T87] ? check_preemption_disabled+0x38/0x220 [ 61.380344][ T87] afs_net_exit+0x1bc/0x310 [ 61.384842][ T87] ? afs_net_init+0xe30/0xe30 [ 61.389512][ T87] ops_exit_list.isra.0+0xa8/0x150 [ 61.394624][ T87] cleanup_net+0x511/0xa50 [ 61.399044][ T87] ? unregister_pernet_device+0x70/0x70 [ 61.404592][ T87] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.410584][ T87] process_one_work+0x965/0x1690 [ 61.415623][ T87] ? lock_release+0x800/0x800 [ 61.420563][ T87] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.425939][ T87] ? rwlock_bug.part.0+0x90/0x90 [ 61.430885][ T87] worker_thread+0x96/0xe10 [ 61.435413][ T87] ? process_one_work+0x1690/0x1690 [ 61.440607][ T87] kthread+0x3b5/0x4a0 [ 61.444669][ T87] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.450385][ T87] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.456106][ T87] ret_from_fork+0x1f/0x30 [ 61.460528][ T87] [ 61.462851][ T87] Allocated by task 6813: [ 61.467177][ T87] save_stack+0x1b/0x40 [ 61.471347][ T87] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 61.477066][ T87] kmem_cache_alloc_trace+0x153/0x7d0 [ 61.482522][ T87] afs_alloc_call+0x55/0x630 [ 61.488150][ T87] afs_charge_preallocation+0xe9/0x2d0 [ 61.493601][ T87] afs_open_socket+0x292/0x360 [ 61.498357][ T87] afs_net_init+0xa6c/0xe30 [ 61.502861][ T87] ops_init+0xaf/0x420 [ 61.509894][ T87] setup_net+0x2de/0x860 [ 61.514130][ T87] copy_net_ns+0x293/0x590 [ 61.518546][ T87] create_new_namespaces+0x3fb/0xb30 [ 61.523830][ T87] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 61.529469][ T87] ksys_unshare+0x43d/0x8e0 [ 61.533990][ T87] __x64_sys_unshare+0x2d/0x40 [ 61.538751][ T87] do_syscall_64+0x60/0xe0 [ 61.543421][ T87] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.549299][ T87] [ 61.551624][ T87] Freed by task 87: [ 61.555438][ T87] save_stack+0x1b/0x40 [ 61.559606][ T87] __kasan_slab_free+0xf7/0x140 [ 61.564902][ T87] kfree+0x109/0x2b0 [ 61.568820][ T87] afs_put_call+0x585/0xa40 [ 61.573346][ T87] rxrpc_discard_prealloc+0x764/0xab0 [ 61.578729][ T87] rxrpc_listen+0x147/0x360 [ 61.583225][ T87] afs_close_socket+0x95/0x320 [ 61.587985][ T87] afs_net_exit+0x1bc/0x310 [ 61.592488][ T87] ops_exit_list.isra.0+0xa8/0x150 [ 61.597589][ T87] cleanup_net+0x511/0xa50 [ 61.602032][ T87] process_one_work+0x965/0x1690 [ 61.606988][ T87] worker_thread+0x96/0xe10 [ 61.611493][ T87] kthread+0x3b5/0x4a0 [ 61.615587][ T87] ret_from_fork+0x1f/0x30 [ 61.619993][ T87] [ 61.622423][ T87] The buggy address belongs to the object at ffff8880a37e4000 [ 61.622423][ T87] which belongs to the cache kmalloc-1k of size 1024 [ 61.636562][ T87] The buggy address is located 484 bytes inside of [ 61.636562][ T87] 1024-byte region [ffff8880a37e4000, ffff8880a37e4400) [ 61.650000][ T87] The buggy address belongs to the page: [ 61.655719][ T87] page:ffffea00028df900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 61.664830][ T87] flags: 0xfffe0000000200(slab) [ 61.669701][ T87] raw: 00fffe0000000200 ffffea00029e2fc8 ffffea00028a2408 ffff8880aa000c40 [ 61.678292][ T87] raw: 0000000000000000 ffff8880a37e4000 0000000100000002 0000000000000000 [ 61.687217][ T87] page dumped because: kasan: bad access detected [ 61.693618][ T87] [ 61.695939][ T87] Memory state around the buggy address: [ 61.701685][ T87] ffff8880a37e4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.709758][ T87] ffff8880a37e4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.717852][ T87] >ffff8880a37e4180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.725912][ T87] ^ [ 61.733105][ T87] ffff8880a37e4200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.741168][ T87] ffff8880a37e4280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.749273][ T87] ================================================================== [ 61.757371][ T87] Disabling lock debugging due to kernel taint [ 61.763576][ T87] Kernel panic - not syncing: panic_on_warn set ... [ 61.770170][ T87] CPU: 1 PID: 87 Comm: kworker/u4:3 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 61.779804][ T87] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.789864][ T87] Workqueue: netns cleanup_net [ 61.794647][ T87] Call Trace: [ 61.797934][ T87] dump_stack+0x18f/0x20d [ 61.802259][ T87] ? afs_wake_up_async_call+0x670/0x770 [ 61.807807][ T87] ? afs_put_call+0xa40/0xa40 [ 61.812490][ T87] panic+0x2e3/0x75c [ 61.816384][ T87] ? __warn_printk+0xf3/0xf3 [ 61.821048][ T87] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 61.827201][ T87] ? trace_hardirqs_on+0x55/0x220 [ 61.832238][ T87] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.837778][ T87] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.843324][ T87] ? afs_put_call+0xa40/0xa40 [ 61.848001][ T87] end_report+0x4d/0x53 [ 61.852318][ T87] kasan_report.cold+0xd/0x37 [ 61.857000][ T87] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.862630][ T87] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.868189][ T87] afs_wake_up_async_call+0x6aa/0x770 [ 61.873557][ T87] ? afs_close_socket+0x320/0x320 [ 61.878573][ T87] ? afs_put_call+0xa40/0xa40 [ 61.883246][ T87] rxrpc_notify_socket+0x1db/0x5d0 [ 61.888449][ T87] ? afs_put_call+0xa40/0xa40 [ 61.893118][ T87] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.899528][ T87] rxrpc_call_completed+0xca/0xf0 [ 61.904567][ T87] rxrpc_discard_prealloc+0x781/0xab0 [ 61.909946][ T87] ? lock_sock_nested+0x94/0x110 [ 61.915235][ T87] rxrpc_listen+0x147/0x360 [ 61.919738][ T87] afs_close_socket+0x95/0x320 [ 61.924493][ T87] ? afs_purge_servers+0x16d/0x300 [ 61.929622][ T87] ? afs_rx_discard_new_call+0x50/0x50 [ 61.935093][ T87] ? init_wait_var_entry+0x200/0x200 [ 61.940571][ T87] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.946291][ T87] ? check_preemption_disabled+0x38/0x220 [ 61.952127][ T87] afs_net_exit+0x1bc/0x310 [ 61.956629][ T87] ? afs_net_init+0xe30/0xe30 [ 61.961390][ T87] ops_exit_list.isra.0+0xa8/0x150 [ 61.966757][ T87] cleanup_net+0x511/0xa50 [ 61.971164][ T87] ? unregister_pernet_device+0x70/0x70 [ 61.976903][ T87] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.982876][ T87] process_one_work+0x965/0x1690 [ 61.987809][ T87] ? lock_release+0x800/0x800 [ 61.992488][ T87] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.997870][ T87] ? rwlock_bug.part.0+0x90/0x90 [ 62.002887][ T87] worker_thread+0x96/0xe10 [ 62.007389][ T87] ? process_one_work+0x1690/0x1690 [ 62.012584][ T87] kthread+0x3b5/0x4a0 [ 62.016738][ T87] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.022444][ T87] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.028158][ T87] ret_from_fork+0x1f/0x30 [ 62.034063][ T87] Kernel Offset: disabled [ 62.038378][ T87] Rebooting in 86400 seconds..