Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.57' (ECDSA) to the list of known hosts. 2020/06/19 03:48:46 fuzzer started 2020/06/19 03:48:46 connecting to host at 10.128.0.26:34303 2020/06/19 03:48:46 checking machine... 2020/06/19 03:48:46 checking revisions... 2020/06/19 03:48:46 testing simple program... syzkaller login: [ 61.025758][ T6844] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 03:48:46 building call list... [ 61.374330][ T21] tipc: TX() has been purged, node left! [ 61.857053][ T21] ================================================================== [ 61.865332][ T21] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 61.873218][ T21] Write of size 1 at addr ffff8880a02171e4 by task kworker/u4:1/21 [ 61.881092][ T21] [ 61.883422][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.8.0-rc1-syzkaller #0 [ 61.891654][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.902059][ T21] Workqueue: netns cleanup_net [ 61.906818][ T21] Call Trace: [ 61.910199][ T21] dump_stack+0x18f/0x20d [ 61.914646][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.920209][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.925751][ T21] ? afs_put_call+0xa40/0xa40 [ 61.930429][ T21] print_address_description.constprop.0.cold+0xd3/0x413 [ 61.937457][ T21] ? vprintk_func+0x97/0x1a6 [ 61.943006][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.948552][ T21] kasan_report.cold+0x1f/0x37 [ 61.953322][ T21] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.958959][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.964606][ T21] afs_wake_up_async_call+0x6aa/0x770 [ 61.969980][ T21] ? afs_close_socket+0x320/0x320 [ 61.975004][ T21] ? afs_put_call+0xa40/0xa40 [ 61.979677][ T21] rxrpc_notify_socket+0x1db/0x5d0 [ 61.984792][ T21] ? afs_put_call+0xa40/0xa40 [ 61.989470][ T21] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.995889][ T21] rxrpc_call_completed+0xca/0xf0 [ 62.000919][ T21] rxrpc_discard_prealloc+0x781/0xab0 [ 62.006295][ T21] ? lock_sock_nested+0x94/0x110 [ 62.011244][ T21] rxrpc_listen+0x147/0x360 [ 62.015854][ T21] afs_close_socket+0x95/0x320 [ 62.020788][ T21] ? afs_purge_servers+0x16d/0x300 [ 62.025919][ T21] ? afs_rx_discard_new_call+0x50/0x50 [ 62.031469][ T21] ? init_wait_var_entry+0x200/0x200 [ 62.036758][ T21] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.042503][ T21] ? check_preemption_disabled+0x38/0x220 [ 62.048228][ T21] afs_net_exit+0x1bc/0x310 [ 62.053181][ T21] ? afs_net_init+0xe30/0xe30 [ 62.057858][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 62.062990][ T21] cleanup_net+0x511/0xa50 [ 62.067495][ T21] ? unregister_pernet_device+0x70/0x70 [ 62.073044][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.079034][ T21] process_one_work+0x965/0x1690 [ 62.084000][ T21] ? lock_release+0x800/0x800 [ 62.088675][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.094051][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 62.099015][ T21] worker_thread+0x96/0xe10 [ 62.103533][ T21] ? process_one_work+0x1690/0x1690 [ 62.110379][ T21] kthread+0x3b5/0x4a0 [ 62.114462][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.120183][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.125906][ T21] ret_from_fork+0x1f/0x30 [ 62.131287][ T21] [ 62.133615][ T21] Allocated by task 6844: [ 62.137962][ T21] save_stack+0x1b/0x40 [ 62.142326][ T21] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 62.147969][ T21] kmem_cache_alloc_trace+0x153/0x7d0 [ 62.153334][ T21] afs_alloc_call+0x55/0x630 [ 62.157919][ T21] afs_charge_preallocation+0xe9/0x2d0 [ 62.163372][ T21] afs_open_socket+0x292/0x360 [ 62.168183][ T21] afs_net_init+0xa6c/0xe30 [ 62.172681][ T21] ops_init+0xaf/0x420 [ 62.176743][ T21] setup_net+0x2de/0x860 [ 62.181277][ T21] copy_net_ns+0x293/0x590 [ 62.185953][ T21] create_new_namespaces+0x3fb/0xb30 [ 62.191234][ T21] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 62.196951][ T21] ksys_unshare+0x43d/0x8e0 [ 62.201450][ T21] __x64_sys_unshare+0x2d/0x40 [ 62.206217][ T21] do_syscall_64+0x60/0xe0 [ 62.210635][ T21] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 62.216538][ T21] [ 62.218863][ T21] Freed by task 21: [ 62.222806][ T21] save_stack+0x1b/0x40 [ 62.227738][ T21] __kasan_slab_free+0xf7/0x140 [ 62.232585][ T21] kfree+0x109/0x2b0 [ 62.236477][ T21] afs_put_call+0x585/0xa40 [ 62.241069][ T21] rxrpc_discard_prealloc+0x764/0xab0 [ 62.246544][ T21] rxrpc_listen+0x147/0x360 [ 62.251221][ T21] afs_close_socket+0x95/0x320 [ 62.256002][ T21] afs_net_exit+0x1bc/0x310 [ 62.260593][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 62.266070][ T21] cleanup_net+0x511/0xa50 [ 62.270744][ T21] process_one_work+0x965/0x1690 [ 62.275688][ T21] worker_thread+0x96/0xe10 [ 62.280360][ T21] kthread+0x3b5/0x4a0 [ 62.284431][ T21] ret_from_fork+0x1f/0x30 [ 62.288842][ T21] [ 62.291341][ T21] The buggy address belongs to the object at ffff8880a0217000 [ 62.291341][ T21] which belongs to the cache kmalloc-1k of size 1024 [ 62.305389][ T21] The buggy address is located 484 bytes inside of [ 62.305389][ T21] 1024-byte region [ffff8880a0217000, ffff8880a0217400) [ 62.318756][ T21] The buggy address belongs to the page: [ 62.324407][ T21] page:ffffea00028085c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 62.333524][ T21] flags: 0xfffe0000000200(slab) [ 62.338465][ T21] raw: 00fffe0000000200 ffffea00027b9f08 ffffea000280a788 ffff8880aa000c40 [ 62.347055][ T21] raw: 0000000000000000 ffff8880a0217000 0000000100000002 0000000000000000 [ 62.355630][ T21] page dumped because: kasan: bad access detected [ 62.362028][ T21] [ 62.364434][ T21] Memory state around the buggy address: [ 62.370153][ T21] ffff8880a0217080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.378234][ T21] ffff8880a0217100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.386291][ T21] >ffff8880a0217180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.394345][ T21] ^ [ 62.401723][ T21] ffff8880a0217200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.409779][ T21] ffff8880a0217280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.418178][ T21] ================================================================== [ 62.426227][ T21] Disabling lock debugging due to kernel taint [ 62.432465][ T21] Kernel panic - not syncing: panic_on_warn set ... [ 62.439070][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 62.448692][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.458931][ T21] Workqueue: netns cleanup_net [ 62.463798][ T21] Call Trace: [ 62.467099][ T21] dump_stack+0x18f/0x20d [ 62.471873][ T21] ? afs_wake_up_async_call+0x670/0x770 [ 62.477423][ T21] ? afs_put_call+0xa40/0xa40 [ 62.482285][ T21] panic+0x2e3/0x75c [ 62.486767][ T21] ? __warn_printk+0xf3/0xf3 [ 62.491374][ T21] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 62.497658][ T21] ? trace_hardirqs_on+0x55/0x220 [ 62.503026][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.508577][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.514125][ T21] ? afs_put_call+0xa40/0xa40 [ 62.518807][ T21] end_report+0x4d/0x53 [ 62.522987][ T21] kasan_report.cold+0xd/0x37 [ 62.527680][ T21] ? rcu_read_lock_held_common+0x51/0xa0 [ 62.533302][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.539149][ T21] afs_wake_up_async_call+0x6aa/0x770 [ 62.544526][ T21] ? afs_close_socket+0x320/0x320 [ 62.549737][ T21] ? afs_put_call+0xa40/0xa40 [ 62.554439][ T21] rxrpc_notify_socket+0x1db/0x5d0 [ 62.559769][ T21] ? afs_put_call+0xa40/0xa40 [ 62.564553][ T21] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.570972][ T21] rxrpc_call_completed+0xca/0xf0 [ 62.576004][ T21] rxrpc_discard_prealloc+0x781/0xab0 [ 62.581380][ T21] ? lock_sock_nested+0x94/0x110 [ 62.586830][ T21] rxrpc_listen+0x147/0x360 [ 62.591337][ T21] afs_close_socket+0x95/0x320 [ 62.596092][ T21] ? afs_purge_servers+0x16d/0x300 [ 62.601328][ T21] ? afs_rx_discard_new_call+0x50/0x50 [ 62.606890][ T21] ? init_wait_var_entry+0x200/0x200 [ 62.612186][ T21] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.618011][ T21] ? check_preemption_disabled+0x38/0x220 [ 62.623759][ T21] afs_net_exit+0x1bc/0x310 [ 62.628443][ T21] ? afs_net_init+0xe30/0xe30 [ 62.633151][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 62.638432][ T21] cleanup_net+0x511/0xa50 [ 62.642878][ T21] ? unregister_pernet_device+0x70/0x70 [ 62.648423][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.654411][ T21] process_one_work+0x965/0x1690 [ 62.659347][ T21] ? lock_release+0x800/0x800 [ 62.664181][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.669553][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 62.674499][ T21] worker_thread+0x96/0xe10 [ 62.679019][ T21] ? process_one_work+0x1690/0x1690 [ 62.684235][ T21] kthread+0x3b5/0x4a0 [ 62.688294][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.694013][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.699734][ T21] ret_from_fork+0x1f/0x30 [ 62.705764][ T21] Kernel Offset: disabled [ 62.710085][ T21] Rebooting in 86400 seconds..