Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.126' (ECDSA) to the list of known hosts. 2020/06/17 21:51:22 fuzzer started 2020/06/17 21:51:22 connecting to host at 10.128.0.26:40023 2020/06/17 21:51:22 checking machine... 2020/06/17 21:51:22 checking revisions... 2020/06/17 21:51:22 testing simple program... syzkaller login: [ 63.860082][ T6821] IPVS: ftp: loaded support on port[0] = 21 2020/06/17 21:51:23 building call list... [ 64.177213][ T44] tipc: TX() has been purged, node left! [ 64.679132][ T44] ================================================================== [ 64.687410][ T44] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 64.695398][ T44] Write of size 1 at addr ffff8880a8ef69e4 by task kworker/u4:2/44 [ 64.703285][ T44] [ 64.705629][ T44] CPU: 1 PID: 44 Comm: kworker/u4:2 Not tainted 5.8.0-rc1-syzkaller #0 [ 64.713870][ T44] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.724193][ T44] Workqueue: netns cleanup_net [ 64.728955][ T44] Call Trace: [ 64.733292][ T44] dump_stack+0x18f/0x20d [ 64.737633][ T44] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.743179][ T44] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.748787][ T44] ? afs_put_call+0xa40/0xa40 [ 64.753465][ T44] print_address_description.constprop.0.cold+0xd3/0x413 [ 64.760499][ T44] ? vprintk_func+0x97/0x1a6 [ 64.765093][ T44] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.770992][ T44] kasan_report.cold+0x1f/0x37 [ 64.775760][ T44] ? rcu_read_lock_held_common+0x51/0xa0 [ 64.781399][ T44] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.786952][ T44] afs_wake_up_async_call+0x6aa/0x770 [ 64.792695][ T44] ? afs_close_socket+0x320/0x320 [ 64.797728][ T44] ? afs_put_call+0xa40/0xa40 [ 64.802413][ T44] rxrpc_notify_socket+0x1db/0x5d0 [ 64.807557][ T44] ? afs_put_call+0xa40/0xa40 [ 64.812325][ T44] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 64.818741][ T44] rxrpc_call_completed+0xca/0xf0 [ 64.823769][ T44] rxrpc_discard_prealloc+0x781/0xab0 [ 64.829157][ T44] ? lock_sock_nested+0x94/0x110 [ 64.834103][ T44] rxrpc_listen+0x147/0x360 [ 64.838614][ T44] afs_close_socket+0x95/0x320 [ 64.843378][ T44] ? afs_purge_servers+0x16d/0x300 [ 64.848603][ T44] ? afs_rx_discard_new_call+0x50/0x50 [ 64.854152][ T44] ? init_wait_var_entry+0x200/0x200 [ 64.859442][ T44] ? rcu_read_lock_held_common+0xa0/0xa0 [ 64.865164][ T44] ? check_preemption_disabled+0x38/0x220 [ 64.870913][ T44] afs_net_exit+0x1bc/0x310 [ 64.875434][ T44] ? afs_net_init+0xe30/0xe30 [ 64.880149][ T44] ops_exit_list.isra.0+0xa8/0x150 [ 64.885286][ T44] cleanup_net+0x511/0xa50 [ 64.889713][ T44] ? unregister_pernet_device+0x70/0x70 [ 64.895283][ T44] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.901296][ T44] process_one_work+0x965/0x1690 [ 64.906256][ T44] ? lock_release+0x800/0x800 [ 64.911464][ T44] ? pwq_dec_nr_in_flight+0x310/0x310 [ 64.917129][ T44] ? rwlock_bug.part.0+0x90/0x90 [ 64.922081][ T44] worker_thread+0x96/0xe10 [ 64.926706][ T44] ? process_one_work+0x1690/0x1690 [ 64.932026][ T44] kthread+0x3b5/0x4a0 [ 64.936093][ T44] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.941817][ T44] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.947648][ T44] ret_from_fork+0x1f/0x30 [ 64.952165][ T44] [ 64.954491][ T44] Allocated by task 6821: [ 64.958848][ T44] save_stack+0x1b/0x40 [ 64.963003][ T44] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 64.968718][ T44] kmem_cache_alloc_trace+0x153/0x7d0 [ 64.974105][ T44] afs_alloc_call+0x55/0x630 [ 64.978744][ T44] afs_charge_preallocation+0xe9/0x2d0 [ 64.984284][ T44] afs_open_socket+0x292/0x360 [ 64.989045][ T44] afs_net_init+0xa6c/0xe30 [ 64.993908][ T44] ops_init+0xaf/0x420 [ 64.997971][ T44] setup_net+0x2de/0x860 [ 65.002212][ T44] copy_net_ns+0x293/0x590 [ 65.006628][ T44] create_new_namespaces+0x3fb/0xb30 [ 65.011910][ T44] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 65.017599][ T44] ksys_unshare+0x43d/0x8e0 [ 65.022117][ T44] __x64_sys_unshare+0x2d/0x40 [ 65.026877][ T44] do_syscall_64+0x60/0xe0 [ 65.031290][ T44] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 65.037170][ T44] [ 65.039491][ T44] Freed by task 44: [ 65.043296][ T44] save_stack+0x1b/0x40 [ 65.047539][ T44] __kasan_slab_free+0xf7/0x140 [ 65.052414][ T44] kfree+0x109/0x2b0 [ 65.056313][ T44] afs_put_call+0x585/0xa40 [ 65.060820][ T44] rxrpc_discard_prealloc+0x764/0xab0 [ 65.066186][ T44] rxrpc_listen+0x147/0x360 [ 65.070797][ T44] afs_close_socket+0x95/0x320 [ 65.075561][ T44] afs_net_exit+0x1bc/0x310 [ 65.080062][ T44] ops_exit_list.isra.0+0xa8/0x150 [ 65.085339][ T44] cleanup_net+0x511/0xa50 [ 65.089753][ T44] process_one_work+0x965/0x1690 [ 65.094686][ T44] worker_thread+0x96/0xe10 [ 65.099185][ T44] kthread+0x3b5/0x4a0 [ 65.103249][ T44] ret_from_fork+0x1f/0x30 [ 65.107654][ T44] [ 65.109993][ T44] The buggy address belongs to the object at ffff8880a8ef6800 [ 65.109993][ T44] which belongs to the cache kmalloc-1k of size 1024 [ 65.124042][ T44] The buggy address is located 484 bytes inside of [ 65.124042][ T44] 1024-byte region [ffff8880a8ef6800, ffff8880a8ef6c00) [ 65.137423][ T44] The buggy address belongs to the page: [ 65.143101][ T44] page:ffffea0002a3bd80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 65.152236][ T44] flags: 0xfffe0000000200(slab) [ 65.157181][ T44] raw: 00fffe0000000200 ffffea00023c65c8 ffffea000254be88 ffff8880aa000c40 [ 65.165781][ T44] raw: 0000000000000000 ffff8880a8ef6000 0000000100000002 0000000000000000 [ 65.174440][ T44] page dumped because: kasan: bad access detected [ 65.180977][ T44] [ 65.183327][ T44] Memory state around the buggy address: [ 65.188963][ T44] ffff8880a8ef6880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.197019][ T44] ffff8880a8ef6900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.205166][ T44] >ffff8880a8ef6980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.213217][ T44] ^ [ 65.220417][ T44] ffff8880a8ef6a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.228477][ T44] ffff8880a8ef6a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.236639][ T44] ================================================================== [ 65.244876][ T44] Disabling lock debugging due to kernel taint [ 65.251078][ T44] Kernel panic - not syncing: panic_on_warn set ... [ 65.257662][ T44] CPU: 1 PID: 44 Comm: kworker/u4:2 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 65.267297][ T44] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.277358][ T44] Workqueue: netns cleanup_net [ 65.282121][ T44] Call Trace: [ 65.285432][ T44] dump_stack+0x18f/0x20d [ 65.289800][ T44] ? afs_wake_up_async_call+0x680/0x770 [ 65.295369][ T44] ? afs_put_call+0xa40/0xa40 [ 65.300131][ T44] panic+0x2e3/0x75c [ 65.306634][ T44] ? __warn_printk+0xf3/0xf3 [ 65.311233][ T44] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 65.317564][ T44] ? trace_hardirqs_on+0x55/0x220 [ 65.322588][ T44] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.328140][ T44] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.333676][ T44] ? afs_put_call+0xa40/0xa40 [ 65.338345][ T44] end_report+0x4d/0x53 [ 65.342495][ T44] kasan_report.cold+0xd/0x37 [ 65.347164][ T44] ? rcu_read_lock_held_common+0x51/0xa0 [ 65.352785][ T44] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.358339][ T44] afs_wake_up_async_call+0x6aa/0x770 [ 65.363698][ T44] ? afs_close_socket+0x320/0x320 [ 65.368730][ T44] ? afs_put_call+0xa40/0xa40 [ 65.373404][ T44] rxrpc_notify_socket+0x1db/0x5d0 [ 65.378507][ T44] ? afs_put_call+0xa40/0xa40 [ 65.383176][ T44] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 65.389600][ T44] rxrpc_call_completed+0xca/0xf0 [ 65.394625][ T44] rxrpc_discard_prealloc+0x781/0xab0 [ 65.399993][ T44] ? lock_sock_nested+0x94/0x110 [ 65.404940][ T44] rxrpc_listen+0x147/0x360 [ 65.409456][ T44] afs_close_socket+0x95/0x320 [ 65.414218][ T44] ? afs_purge_servers+0x16d/0x300 [ 65.419497][ T44] ? afs_rx_discard_new_call+0x50/0x50 [ 65.424958][ T44] ? init_wait_var_entry+0x200/0x200 [ 65.430238][ T44] ? rcu_read_lock_held_common+0xa0/0xa0 [ 65.435881][ T44] ? check_preemption_disabled+0x38/0x220 [ 65.441765][ T44] afs_net_exit+0x1bc/0x310 [ 65.446275][ T44] ? afs_net_init+0xe30/0xe30 [ 65.450956][ T44] ops_exit_list.isra.0+0xa8/0x150 [ 65.456060][ T44] cleanup_net+0x511/0xa50 [ 65.460483][ T44] ? unregister_pernet_device+0x70/0x70 [ 65.466021][ T44] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.471999][ T44] process_one_work+0x965/0x1690 [ 65.477365][ T44] ? lock_release+0x800/0x800 [ 65.482034][ T44] ? pwq_dec_nr_in_flight+0x310/0x310 [ 65.487395][ T44] ? rwlock_bug.part.0+0x90/0x90 [ 65.493632][ T44] worker_thread+0x96/0xe10 [ 65.498133][ T44] ? process_one_work+0x1690/0x1690 [ 65.503332][ T44] kthread+0x3b5/0x4a0 [ 65.507391][ T44] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.513113][ T44] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.519118][ T44] ret_from_fork+0x1f/0x30 [ 65.525200][ T44] Kernel Offset: disabled [ 65.529519][ T44] Rebooting in 86400 seconds..