[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.44' (ECDSA) to the list of known hosts. 2020/06/30 17:23:05 fuzzer started 2020/06/30 17:23:06 connecting to host at 10.128.0.26:34917 2020/06/30 17:23:06 checking machine... 2020/06/30 17:23:06 checking revisions... 2020/06/30 17:23:06 testing simple program... syzkaller login: [ 63.270956][ T6806] IPVS: ftp: loaded support on port[0] = 21 2020/06/30 17:23:06 building call list... [ 63.582222][ T465] tipc: TX() has been purged, node left! [ 64.093994][ T465] ================================================================== [ 64.102491][ T465] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x430/0x4a0 [ 64.110376][ T465] Write of size 1 at addr ffff8880a70d61e4 by task kworker/u4:5/465 [ 64.120865][ T465] [ 64.123202][ T465] CPU: 1 PID: 465 Comm: kworker/u4:5 Not tainted 5.8.0-rc1-syzkaller #0 [ 64.131514][ T465] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.141572][ T465] Workqueue: netns cleanup_net [ 64.146326][ T465] Call Trace: [ 64.149618][ T465] dump_stack+0x18f/0x20d [ 64.153955][ T465] ? afs_wake_up_async_call+0x430/0x4a0 [ 64.159495][ T465] ? afs_wake_up_async_call+0x430/0x4a0 [ 64.165033][ T465] ? afs_put_call+0x440/0x440 [ 64.169710][ T465] print_address_description.constprop.0.cold+0xae/0x436 [ 64.176738][ T465] ? vprintk_func+0x97/0x1a6 [ 64.181331][ T465] ? afs_wake_up_async_call+0x430/0x4a0 [ 64.186872][ T465] kasan_report.cold+0x1f/0x37 [ 64.191664][ T465] ? afs_wake_up_async_call+0x430/0x4a0 [ 64.197991][ T465] afs_wake_up_async_call+0x430/0x4a0 [ 64.203366][ T465] ? afs_close_socket+0x320/0x320 [ 64.208411][ T465] rxrpc_notify_socket+0x1db/0x5d0 [ 64.213523][ T465] ? afs_put_call+0x440/0x440 [ 64.218208][ T465] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 64.224620][ T465] rxrpc_call_completed+0xd0/0xf0 [ 64.229643][ T465] rxrpc_discard_prealloc+0x777/0xab0 [ 64.235271][ T465] ? lock_sock_nested+0x94/0x110 [ 64.240215][ T465] rxrpc_listen+0x11c/0x330 [ 64.244750][ T465] afs_close_socket+0x95/0x320 [ 64.249510][ T465] ? afs_purge_servers+0x16d/0x300 [ 64.254627][ T465] ? afs_rx_discard_new_call+0x50/0x50 [ 64.260093][ T465] ? init_wait_var_entry+0x200/0x200 [ 64.265382][ T465] ? check_preemption_disabled+0x38/0x220 [ 64.271102][ T465] afs_net_exit+0x1bc/0x310 [ 64.275601][ T465] ? __bpf_trace_afs_cb_miss+0x100/0x100 [ 64.281227][ T465] ops_exit_list+0xb0/0x160 [ 64.285729][ T465] cleanup_net+0x4ea/0xa00 [ 64.290141][ T465] ? __schedule+0x887/0x1eb0 [ 64.294726][ T465] ? ops_free_list.part.0+0x3d0/0x3d0 [ 64.300094][ T465] ? check_preemption_disabled+0x38/0x220 [ 64.306258][ T465] process_one_work+0x94c/0x1670 [ 64.311199][ T465] ? lock_release+0x8d0/0x8d0 [ 64.315873][ T465] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 64.321247][ T465] ? rwlock_bug.part.0+0x90/0x90 [ 64.326192][ T465] worker_thread+0x64c/0x1120 [ 64.330875][ T465] ? __kthread_parkme+0x13f/0x1e0 [ 64.335895][ T465] ? process_one_work+0x1670/0x1670 [ 64.341092][ T465] kthread+0x3b5/0x4a0 [ 64.345152][ T465] ? __kthread_bind_mask+0xc0/0xc0 [ 64.350257][ T465] ? __kthread_bind_mask+0xc0/0xc0 [ 64.355366][ T465] ret_from_fork+0x1f/0x30 [ 64.359789][ T465] [ 64.362112][ T465] Allocated by task 6806: [ 64.366435][ T465] save_stack+0x1b/0x40 [ 64.370592][ T465] __kasan_kmalloc.constprop.0+0xc2/0xd0 [ 64.376303][ T465] kmem_cache_alloc_trace+0x14f/0x2d0 [ 64.381666][ T465] afs_alloc_call+0x4f/0x360 [ 64.386248][ T465] afs_charge_preallocation+0xe9/0x2d0 [ 64.391697][ T465] afs_open_socket+0x294/0x360 [ 64.396505][ T465] afs_net_init+0xa6c/0xe30 [ 64.401012][ T465] ops_init+0xaf/0x470 [ 64.405075][ T465] setup_net+0x2d8/0x850 [ 64.409311][ T465] copy_net_ns+0x2cf/0x5e0 [ 64.413726][ T465] create_new_namespaces+0x3f6/0xb10 [ 64.419006][ T465] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 64.424630][ T465] ksys_unshare+0x36c/0x9a0 [ 64.429385][ T465] __x64_sys_unshare+0x2d/0x40 [ 64.434145][ T465] do_syscall_64+0x60/0xe0 [ 64.438556][ T465] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.444439][ T465] [ 64.446759][ T465] Freed by task 465: [ 64.450651][ T465] save_stack+0x1b/0x40 [ 64.454797][ T465] __kasan_slab_free+0xf5/0x140 [ 64.459638][ T465] kfree+0x103/0x2c0 [ 64.463529][ T465] afs_put_call+0x345/0x440 [ 64.468024][ T465] rxrpc_discard_prealloc+0x75a/0xab0 [ 64.473658][ T465] rxrpc_listen+0x11c/0x330 [ 64.478153][ T465] afs_close_socket+0x95/0x320 [ 64.482906][ T465] afs_net_exit+0x1bc/0x310 [ 64.487403][ T465] ops_exit_list+0xb0/0x160 [ 64.491900][ T465] cleanup_net+0x4ea/0xa00 [ 64.496325][ T465] process_one_work+0x94c/0x1670 [ 64.501262][ T465] worker_thread+0x64c/0x1120 [ 64.505957][ T465] kthread+0x3b5/0x4a0 [ 64.510041][ T465] ret_from_fork+0x1f/0x30 [ 64.514443][ T465] [ 64.516772][ T465] The buggy address belongs to the object at ffff8880a70d6000 [ 64.516772][ T465] which belongs to the cache kmalloc-1k of size 1024 [ 64.530819][ T465] The buggy address is located 484 bytes inside of [ 64.530819][ T465] 1024-byte region [ffff8880a70d6000, ffff8880a70d6400) [ 64.544160][ T465] The buggy address belongs to the page: [ 64.549787][ T465] page:ffffea00029c3580 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 64.558928][ T465] flags: 0xfffe0000000200(slab) [ 64.563780][ T465] raw: 00fffe0000000200 ffffea0002512e88 ffffea00024b2608 ffff8880aa000c40 [ 64.572361][ T465] raw: 0000000000000000 ffff8880a70d6000 0000000100000002 0000000000000000 [ 64.580946][ T465] page dumped because: kasan: bad access detected [ 64.587348][ T465] [ 64.589671][ T465] Memory state around the buggy address: [ 64.595298][ T465] ffff8880a70d6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.603355][ T465] ffff8880a70d6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.611409][ T465] >ffff8880a70d6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.619458][ T465] ^ [ 64.626650][ T465] ffff8880a70d6200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.634704][ T465] ffff8880a70d6280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.642755][ T465] ================================================================== [ 64.650815][ T465] Disabling lock debugging due to kernel taint [ 64.657199][ T465] Kernel panic - not syncing: panic_on_warn set ... [ 64.663870][ T465] CPU: 1 PID: 465 Comm: kworker/u4:5 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 64.673582][ T465] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.683650][ T465] Workqueue: netns cleanup_net [ 64.688409][ T465] Call Trace: [ 64.691701][ T465] dump_stack+0x18f/0x20d [ 64.696135][ T465] ? afs_wake_up_async_call+0x400/0x4a0 [ 64.701681][ T465] ? afs_put_call+0x440/0x440 [ 64.706356][ T465] panic+0x2e3/0x75c [ 64.710267][ T465] ? __warn_printk+0xf3/0xf3 [ 64.714850][ T465] ? afs_wake_up_async_call+0x430/0x4a0 [ 64.720404][ T465] ? trace_hardirqs_on+0x55/0x220 [ 64.725462][ T465] ? afs_wake_up_async_call+0x430/0x4a0 [ 64.730997][ T465] ? afs_wake_up_async_call+0x430/0x4a0 [ 64.736619][ T465] ? afs_put_call+0x440/0x440 [ 64.741274][ T465] end_report+0x4d/0x53 [ 64.745415][ T465] kasan_report.cold+0xd/0x37 [ 64.750085][ T465] ? afs_wake_up_async_call+0x430/0x4a0 [ 64.755619][ T465] afs_wake_up_async_call+0x430/0x4a0 [ 64.760979][ T465] ? afs_close_socket+0x320/0x320 [ 64.765987][ T465] rxrpc_notify_socket+0x1db/0x5d0 [ 64.771293][ T465] ? afs_put_call+0x440/0x440 [ 64.775955][ T465] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 64.783660][ T465] rxrpc_call_completed+0xd0/0xf0 [ 64.788706][ T465] rxrpc_discard_prealloc+0x777/0xab0 [ 64.794186][ T465] ? lock_sock_nested+0x94/0x110 [ 64.799123][ T465] rxrpc_listen+0x11c/0x330 [ 64.803625][ T465] afs_close_socket+0x95/0x320 [ 64.808391][ T465] ? afs_purge_servers+0x16d/0x300 [ 64.813513][ T465] ? afs_rx_discard_new_call+0x50/0x50 [ 64.818955][ T465] ? init_wait_var_entry+0x200/0x200 [ 64.824223][ T465] ? check_preemption_disabled+0x38/0x220 [ 64.829927][ T465] afs_net_exit+0x1bc/0x310 [ 64.834423][ T465] ? __bpf_trace_afs_cb_miss+0x100/0x100 [ 64.840047][ T465] ops_exit_list+0xb0/0x160 [ 64.844576][ T465] cleanup_net+0x4ea/0xa00 [ 64.848998][ T465] ? __schedule+0x887/0x1eb0 [ 64.853578][ T465] ? ops_free_list.part.0+0x3d0/0x3d0 [ 64.858948][ T465] ? check_preemption_disabled+0x38/0x220 [ 64.864794][ T465] process_one_work+0x94c/0x1670 [ 64.869735][ T465] ? lock_release+0x8d0/0x8d0 [ 64.874400][ T465] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 64.879778][ T465] ? rwlock_bug.part.0+0x90/0x90 [ 64.884786][ T465] worker_thread+0x64c/0x1120 [ 64.889465][ T465] ? __kthread_parkme+0x13f/0x1e0 [ 64.894500][ T465] ? process_one_work+0x1670/0x1670 [ 64.899694][ T465] kthread+0x3b5/0x4a0 [ 64.903753][ T465] ? __kthread_bind_mask+0xc0/0xc0 [ 64.908861][ T465] ? __kthread_bind_mask+0xc0/0xc0 [ 64.913972][ T465] ret_from_fork+0x1f/0x30 [ 64.920470][ T465] Kernel Offset: disabled [ 64.924794][ T465] Rebooting in 86400 seconds..