[ 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 '10.128.15.195' (ECDSA) to the list of known hosts. 2020/06/17 06:05:55 fuzzer started 2020/06/17 06:05:55 connecting to host at 10.128.0.26:32993 2020/06/17 06:05:55 checking machine... 2020/06/17 06:05:55 checking revisions... 2020/06/17 06:05:55 testing simple program... syzkaller login: [ 64.193721][ T6843] IPVS: ftp: loaded support on port[0] = 21 2020/06/17 06:05:56 building call list... [ 64.536957][ T57] tipc: TX() has been purged, node left! [ 65.059348][ T57] ================================================================== [ 65.067614][ T57] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 65.075503][ T57] Write of size 1 at addr ffff8880908b61e4 by task kworker/u4:3/57 [ 65.083415][ T57] [ 65.085776][ T57] CPU: 1 PID: 57 Comm: kworker/u4:3 Not tainted 5.8.0-rc1-syzkaller #0 [ 65.094005][ T57] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.104241][ T57] Workqueue: netns cleanup_net [ 65.109022][ T57] Call Trace: [ 65.112314][ T57] dump_stack+0x18f/0x20d [ 65.116761][ T57] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.122302][ T57] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.127863][ T57] ? afs_put_call+0xa40/0xa40 [ 65.132540][ T57] print_address_description.constprop.0.cold+0xd3/0x413 [ 65.139568][ T57] ? vprintk_func+0x97/0x1a6 [ 65.144159][ T57] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.149705][ T57] kasan_report.cold+0x1f/0x37 [ 65.154475][ T57] ? rcu_read_lock_held_common+0x51/0xa0 [ 65.160114][ T57] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.166015][ T57] afs_wake_up_async_call+0x6aa/0x770 [ 65.172024][ T57] ? afs_close_socket+0x320/0x320 [ 65.177070][ T57] ? afs_put_call+0xa40/0xa40 [ 65.181765][ T57] rxrpc_notify_socket+0x1db/0x5d0 [ 65.186901][ T57] ? afs_put_call+0xa40/0xa40 [ 65.191579][ T57] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 65.197996][ T57] rxrpc_call_completed+0xca/0xf0 [ 65.203024][ T57] rxrpc_discard_prealloc+0x781/0xab0 [ 65.209023][ T57] ? lock_sock_nested+0x94/0x110 [ 65.213964][ T57] rxrpc_listen+0x147/0x360 [ 65.218493][ T57] afs_close_socket+0x95/0x320 [ 65.223268][ T57] ? afs_purge_servers+0x16d/0x300 [ 65.228489][ T57] ? afs_rx_discard_new_call+0x50/0x50 [ 65.233964][ T57] ? init_wait_var_entry+0x200/0x200 [ 65.239255][ T57] ? rcu_read_lock_held_common+0xa0/0xa0 [ 65.244890][ T57] ? check_preemption_disabled+0x38/0x220 [ 65.250611][ T57] afs_net_exit+0x1bc/0x310 [ 65.255116][ T57] ? afs_net_init+0xe30/0xe30 [ 65.259796][ T57] ops_exit_list.isra.0+0xa8/0x150 [ 65.264910][ T57] cleanup_net+0x511/0xa50 [ 65.269353][ T57] ? unregister_pernet_device+0x70/0x70 [ 65.274906][ T57] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.280897][ T57] process_one_work+0x965/0x1690 [ 65.285932][ T57] ? lock_release+0x800/0x800 [ 65.290610][ T57] ? pwq_dec_nr_in_flight+0x310/0x310 [ 65.295995][ T57] ? rwlock_bug.part.0+0x90/0x90 [ 65.300960][ T57] worker_thread+0x96/0xe10 [ 65.305475][ T57] ? process_one_work+0x1690/0x1690 [ 65.310933][ T57] kthread+0x3b5/0x4a0 [ 65.314999][ T57] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.320714][ T57] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.326470][ T57] ret_from_fork+0x1f/0x30 [ 65.330981][ T57] [ 65.333311][ T57] Allocated by task 6843: [ 65.337647][ T57] save_stack+0x1b/0x40 [ 65.341815][ T57] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 65.347445][ T57] kmem_cache_alloc_trace+0x153/0x7d0 [ 65.352841][ T57] afs_alloc_call+0x55/0x630 [ 65.357430][ T57] afs_charge_preallocation+0xe9/0x2d0 [ 65.362897][ T57] afs_open_socket+0x292/0x360 [ 65.367653][ T57] afs_net_init+0xa6c/0xe30 [ 65.372150][ T57] ops_init+0xaf/0x420 [ 65.376214][ T57] setup_net+0x2de/0x860 [ 65.380452][ T57] copy_net_ns+0x293/0x590 [ 65.384866][ T57] create_new_namespaces+0x3fb/0xb30 [ 65.390253][ T57] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 65.395881][ T57] ksys_unshare+0x43d/0x8e0 [ 65.400380][ T57] __x64_sys_unshare+0x2d/0x40 [ 65.405145][ T57] do_syscall_64+0x60/0xe0 [ 65.409561][ T57] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 65.415442][ T57] [ 65.417765][ T57] Freed by task 57: [ 65.421569][ T57] save_stack+0x1b/0x40 [ 65.425727][ T57] __kasan_slab_free+0xf7/0x140 [ 65.430658][ T57] kfree+0x109/0x2b0 [ 65.434580][ T57] afs_put_call+0x585/0xa40 [ 65.439093][ T57] rxrpc_discard_prealloc+0x764/0xab0 [ 65.444465][ T57] rxrpc_listen+0x147/0x360 [ 65.448974][ T57] afs_close_socket+0x95/0x320 [ 65.453829][ T57] afs_net_exit+0x1bc/0x310 [ 65.458358][ T57] ops_exit_list.isra.0+0xa8/0x150 [ 65.463504][ T57] cleanup_net+0x511/0xa50 [ 65.467920][ T57] process_one_work+0x965/0x1690 [ 65.472858][ T57] worker_thread+0x96/0xe10 [ 65.477620][ T57] kthread+0x3b5/0x4a0 [ 65.481684][ T57] ret_from_fork+0x1f/0x30 [ 65.486085][ T57] [ 65.488431][ T57] The buggy address belongs to the object at ffff8880908b6000 [ 65.488431][ T57] which belongs to the cache kmalloc-1k of size 1024 [ 65.502784][ T57] The buggy address is located 484 bytes inside of [ 65.502784][ T57] 1024-byte region [ffff8880908b6000, ffff8880908b6400) [ 65.516216][ T57] The buggy address belongs to the page: [ 65.521847][ T57] page:ffffea0002422d80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 65.530959][ T57] flags: 0xfffe0000000200(slab) [ 65.535837][ T57] raw: 00fffe0000000200 ffffea0002a20188 ffffea0002723708 ffff8880aa000c40 [ 65.544518][ T57] raw: 0000000000000000 ffff8880908b6000 0000000100000002 0000000000000000 [ 65.553100][ T57] page dumped because: kasan: bad access detected [ 65.559505][ T57] [ 65.561825][ T57] Memory state around the buggy address: [ 65.567458][ T57] ffff8880908b6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.575537][ T57] ffff8880908b6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.583959][ T57] >ffff8880908b6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.592011][ T57] ^ [ 65.599230][ T57] ffff8880908b6200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.607291][ T57] ffff8880908b6280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 65.615369][ T57] ================================================================== [ 65.623419][ T57] Disabling lock debugging due to kernel taint [ 65.629611][ T57] Kernel panic - not syncing: panic_on_warn set ... [ 65.636820][ T57] CPU: 1 PID: 57 Comm: kworker/u4:3 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 65.646431][ T57] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.656655][ T57] Workqueue: netns cleanup_net [ 65.661429][ T57] Call Trace: [ 65.664712][ T57] dump_stack+0x18f/0x20d [ 65.669138][ T57] ? afs_wake_up_async_call+0x670/0x770 [ 65.674686][ T57] ? afs_put_call+0xa40/0xa40 [ 65.679360][ T57] panic+0x2e3/0x75c [ 65.683255][ T57] ? __warn_printk+0xf3/0xf3 [ 65.687843][ T57] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 65.694011][ T57] ? trace_hardirqs_on+0x55/0x220 [ 65.699042][ T57] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.704668][ T57] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.710476][ T57] ? afs_put_call+0xa40/0xa40 [ 65.715158][ T57] end_report+0x4d/0x53 [ 65.719412][ T57] kasan_report.cold+0xd/0x37 [ 65.724206][ T57] ? rcu_read_lock_held_common+0x51/0xa0 [ 65.729863][ T57] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.735432][ T57] afs_wake_up_async_call+0x6aa/0x770 [ 65.740798][ T57] ? afs_close_socket+0x320/0x320 [ 65.745830][ T57] ? afs_put_call+0xa40/0xa40 [ 65.750532][ T57] rxrpc_notify_socket+0x1db/0x5d0 [ 65.755636][ T57] ? afs_put_call+0xa40/0xa40 [ 65.760321][ T57] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 65.766728][ T57] rxrpc_call_completed+0xca/0xf0 [ 65.771845][ T57] rxrpc_discard_prealloc+0x781/0xab0 [ 65.777221][ T57] ? lock_sock_nested+0x94/0x110 [ 65.782177][ T57] rxrpc_listen+0x147/0x360 [ 65.786797][ T57] afs_close_socket+0x95/0x320 [ 65.791552][ T57] ? afs_purge_servers+0x16d/0x300 [ 65.796680][ T57] ? afs_rx_discard_new_call+0x50/0x50 [ 65.802161][ T57] ? init_wait_var_entry+0x200/0x200 [ 65.807442][ T57] ? rcu_read_lock_held_common+0xa0/0xa0 [ 65.813069][ T57] ? check_preemption_disabled+0x38/0x220 [ 65.818780][ T57] afs_net_exit+0x1bc/0x310 [ 65.823273][ T57] ? afs_net_init+0xe30/0xe30 [ 65.827962][ T57] ops_exit_list.isra.0+0xa8/0x150 [ 65.833064][ T57] cleanup_net+0x511/0xa50 [ 65.837482][ T57] ? unregister_pernet_device+0x70/0x70 [ 65.843025][ T57] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.849025][ T57] process_one_work+0x965/0x1690 [ 65.853978][ T57] ? lock_release+0x800/0x800 [ 65.858669][ T57] ? pwq_dec_nr_in_flight+0x310/0x310 [ 65.864044][ T57] ? rwlock_bug.part.0+0x90/0x90 [ 65.868984][ T57] worker_thread+0x96/0xe10 [ 65.873487][ T57] ? process_one_work+0x1690/0x1690 [ 65.878769][ T57] kthread+0x3b5/0x4a0 [ 65.882829][ T57] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.888537][ T57] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.894271][ T57] ret_from_fork+0x1f/0x30 [ 65.900097][ T57] Kernel Offset: disabled [ 65.904423][ T57] Rebooting in 86400 seconds..