[ 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 '10.128.0.123' (ECDSA) to the list of known hosts. 2020/06/17 18:43:31 fuzzer started 2020/06/17 18:43:32 connecting to host at 10.128.0.26:46833 2020/06/17 18:43:32 checking machine... 2020/06/17 18:43:32 checking revisions... 2020/06/17 18:43:32 testing simple program... syzkaller login: [ 63.065045][ T6869] IPVS: ftp: loaded support on port[0] = 21 2020/06/17 18:43:32 building call list... [ 63.438834][ T81] tipc: TX() has been purged, node left! [ 63.961157][ T81] ================================================================== [ 63.969392][ T81] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 63.979448][ T81] Write of size 1 at addr ffff8880a019f1e4 by task kworker/u4:3/81 [ 63.987326][ T81] [ 63.989669][ T81] CPU: 0 PID: 81 Comm: kworker/u4:3 Not tainted 5.8.0-rc1-syzkaller #0 [ 63.998038][ T81] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.008188][ T81] Workqueue: netns cleanup_net [ 64.013085][ T81] Call Trace: [ 64.016386][ T81] dump_stack+0x18f/0x20d [ 64.020727][ T81] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.027228][ T81] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.032896][ T81] ? afs_put_call+0xa40/0xa40 [ 64.037575][ T81] print_address_description.constprop.0.cold+0xd3/0x413 [ 64.044775][ T81] ? vprintk_func+0x97/0x1a6 [ 64.049386][ T81] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.054929][ T81] kasan_report.cold+0x1f/0x37 [ 64.059698][ T81] ? rcu_read_lock_held_common+0x51/0xa0 [ 64.065325][ T81] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.070875][ T81] afs_wake_up_async_call+0x6aa/0x770 [ 64.076245][ T81] ? afs_close_socket+0x320/0x320 [ 64.081285][ T81] ? afs_put_call+0xa40/0xa40 [ 64.085987][ T81] rxrpc_notify_socket+0x1db/0x5d0 [ 64.091103][ T81] ? afs_put_call+0xa40/0xa40 [ 64.095787][ T81] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 64.102206][ T81] rxrpc_call_completed+0xca/0xf0 [ 64.107240][ T81] rxrpc_discard_prealloc+0x781/0xab0 [ 64.112703][ T81] ? lock_sock_nested+0x94/0x110 [ 64.117645][ T81] rxrpc_listen+0x147/0x360 [ 64.122150][ T81] afs_close_socket+0x95/0x320 [ 64.126911][ T81] ? afs_purge_servers+0x16d/0x300 [ 64.132022][ T81] ? afs_rx_discard_new_call+0x50/0x50 [ 64.137482][ T81] ? init_wait_var_entry+0x200/0x200 [ 64.142869][ T81] ? rcu_read_lock_held_common+0xa0/0xa0 [ 64.148510][ T81] ? check_preemption_disabled+0x38/0x220 [ 64.154230][ T81] afs_net_exit+0x1bc/0x310 [ 64.158733][ T81] ? afs_net_init+0xe30/0xe30 [ 64.163406][ T81] ops_exit_list.isra.0+0xa8/0x150 [ 64.168519][ T81] cleanup_net+0x511/0xa50 [ 64.172940][ T81] ? unregister_pernet_device+0x70/0x70 [ 64.178517][ T81] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.184504][ T81] process_one_work+0x965/0x1690 [ 64.189453][ T81] ? lock_release+0x800/0x800 [ 64.194133][ T81] ? pwq_dec_nr_in_flight+0x310/0x310 [ 64.199508][ T81] ? rwlock_bug.part.0+0x90/0x90 [ 64.204456][ T81] worker_thread+0x96/0xe10 [ 64.208983][ T81] ? process_one_work+0x1690/0x1690 [ 64.214195][ T81] kthread+0x3b5/0x4a0 [ 64.218295][ T81] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.224012][ T81] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.229838][ T81] ret_from_fork+0x1f/0x30 [ 64.234264][ T81] [ 64.236597][ T81] Allocated by task 6869: [ 64.240926][ T81] save_stack+0x1b/0x40 [ 64.245085][ T81] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 64.250714][ T81] kmem_cache_alloc_trace+0x153/0x7d0 [ 64.256091][ T81] afs_alloc_call+0x55/0x630 [ 64.260686][ T81] afs_charge_preallocation+0xe9/0x2d0 [ 64.266175][ T81] afs_open_socket+0x292/0x360 [ 64.270951][ T81] afs_net_init+0xa6c/0xe30 [ 64.275460][ T81] ops_init+0xaf/0x420 [ 64.279525][ T81] setup_net+0x2de/0x860 [ 64.283773][ T81] copy_net_ns+0x293/0x590 [ 64.288205][ T81] create_new_namespaces+0x3fb/0xb30 [ 64.293488][ T81] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 64.299731][ T81] ksys_unshare+0x43d/0x8e0 [ 64.304230][ T81] __x64_sys_unshare+0x2d/0x40 [ 64.309510][ T81] do_syscall_64+0x60/0xe0 [ 64.313929][ T81] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.319807][ T81] [ 64.322162][ T81] Freed by task 81: [ 64.325982][ T81] save_stack+0x1b/0x40 [ 64.330147][ T81] __kasan_slab_free+0xf7/0x140 [ 64.335009][ T81] kfree+0x109/0x2b0 [ 64.338921][ T81] afs_put_call+0x585/0xa40 [ 64.344291][ T81] rxrpc_discard_prealloc+0x764/0xab0 [ 64.349652][ T81] rxrpc_listen+0x147/0x360 [ 64.354300][ T81] afs_close_socket+0x95/0x320 [ 64.359062][ T81] afs_net_exit+0x1bc/0x310 [ 64.363565][ T81] ops_exit_list.isra.0+0xa8/0x150 [ 64.368829][ T81] cleanup_net+0x511/0xa50 [ 64.373395][ T81] process_one_work+0x965/0x1690 [ 64.378451][ T81] worker_thread+0x96/0xe10 [ 64.382971][ T81] kthread+0x3b5/0x4a0 [ 64.387042][ T81] ret_from_fork+0x1f/0x30 [ 64.391449][ T81] [ 64.393791][ T81] The buggy address belongs to the object at ffff8880a019f000 [ 64.393791][ T81] which belongs to the cache kmalloc-1k of size 1024 [ 64.407878][ T81] The buggy address is located 484 bytes inside of [ 64.407878][ T81] 1024-byte region [ffff8880a019f000, ffff8880a019f400) [ 64.421396][ T81] The buggy address belongs to the page: [ 64.427019][ T81] page:ffffea00028067c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 64.436118][ T81] flags: 0xfffe0000000200(slab) [ 64.440975][ T81] raw: 00fffe0000000200 ffffea0002917988 ffffea0002803508 ffff8880aa000c40 [ 64.449657][ T81] raw: 0000000000000000 ffff8880a019f000 0000000100000002 0000000000000000 [ 64.458225][ T81] page dumped because: kasan: bad access detected [ 64.464615][ T81] [ 64.466928][ T81] Memory state around the buggy address: [ 64.472542][ T81] ffff8880a019f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.480589][ T81] ffff8880a019f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.488743][ T81] >ffff8880a019f180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.496793][ T81] ^ [ 64.503970][ T81] ffff8880a019f200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.512027][ T81] ffff8880a019f280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.520101][ T81] ================================================================== [ 64.528157][ T81] Disabling lock debugging due to kernel taint [ 64.534339][ T81] Kernel panic - not syncing: panic_on_warn set ... [ 64.540929][ T81] CPU: 0 PID: 81 Comm: kworker/u4:3 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 64.550551][ T81] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.560613][ T81] Workqueue: netns cleanup_net [ 64.565377][ T81] Call Trace: [ 64.568670][ T81] dump_stack+0x18f/0x20d [ 64.573001][ T81] ? afs_wake_up_async_call+0x670/0x770 [ 64.578552][ T81] ? afs_put_call+0xa40/0xa40 [ 64.583212][ T81] panic+0x2e3/0x75c [ 64.587113][ T81] ? __warn_printk+0xf3/0xf3 [ 64.591698][ T81] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 64.597844][ T81] ? trace_hardirqs_on+0x55/0x220 [ 64.602884][ T81] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.608422][ T81] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.613960][ T81] ? afs_put_call+0xa40/0xa40 [ 64.618639][ T81] end_report+0x4d/0x53 [ 64.622780][ T81] kasan_report.cold+0xd/0x37 [ 64.627445][ T81] ? rcu_read_lock_held_common+0x51/0xa0 [ 64.633062][ T81] ? afs_wake_up_async_call+0x6aa/0x770 [ 64.638602][ T81] afs_wake_up_async_call+0x6aa/0x770 [ 64.643960][ T81] ? afs_close_socket+0x320/0x320 [ 64.648975][ T81] ? afs_put_call+0xa40/0xa40 [ 64.653638][ T81] rxrpc_notify_socket+0x1db/0x5d0 [ 64.658728][ T81] ? afs_put_call+0xa40/0xa40 [ 64.663390][ T81] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 64.669804][ T81] rxrpc_call_completed+0xca/0xf0 [ 64.674813][ T81] rxrpc_discard_prealloc+0x781/0xab0 [ 64.680177][ T81] ? lock_sock_nested+0x94/0x110 [ 64.685130][ T81] rxrpc_listen+0x147/0x360 [ 64.689632][ T81] afs_close_socket+0x95/0x320 [ 64.694395][ T81] ? afs_purge_servers+0x16d/0x300 [ 64.699501][ T81] ? afs_rx_discard_new_call+0x50/0x50 [ 64.704954][ T81] ? init_wait_var_entry+0x200/0x200 [ 64.710235][ T81] ? rcu_read_lock_held_common+0xa0/0xa0 [ 64.715861][ T81] ? check_preemption_disabled+0x38/0x220 [ 64.721572][ T81] afs_net_exit+0x1bc/0x310 [ 64.726067][ T81] ? afs_net_init+0xe30/0xe30 [ 64.730736][ T81] ops_exit_list.isra.0+0xa8/0x150 [ 64.735839][ T81] cleanup_net+0x511/0xa50 [ 64.740250][ T81] ? unregister_pernet_device+0x70/0x70 [ 64.745794][ T81] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.751773][ T81] process_one_work+0x965/0x1690 [ 64.756707][ T81] ? lock_release+0x800/0x800 [ 64.761379][ T81] ? pwq_dec_nr_in_flight+0x310/0x310 [ 64.766745][ T81] ? rwlock_bug.part.0+0x90/0x90 [ 64.771678][ T81] worker_thread+0x96/0xe10 [ 64.776178][ T81] ? process_one_work+0x1690/0x1690 [ 64.781368][ T81] kthread+0x3b5/0x4a0 [ 64.785428][ T81] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.791142][ T81] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.796857][ T81] ret_from_fork+0x1f/0x30 [ 64.802730][ T81] Kernel Offset: disabled [ 64.807137][ T81] Rebooting in 86400 seconds..