[ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.154' (ECDSA) to the list of known hosts. 2020/06/19 06:35:40 fuzzer started 2020/06/19 06:35:40 connecting to host at 10.128.0.26:38733 2020/06/19 06:35:40 checking machine... 2020/06/19 06:35:40 checking revisions... 2020/06/19 06:35:40 testing simple program... syzkaller login: [ 61.507065][ T6796] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 06:35:41 building call list... [ 61.846755][ T219] tipc: TX() has been purged, node left! [ 62.328819][ T219] ================================================================== [ 62.337062][ T219] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 62.344955][ T219] Write of size 1 at addr ffff88808224e1e4 by task kworker/u4:5/219 [ 62.352919][ T219] [ 62.355278][ T219] CPU: 0 PID: 219 Comm: kworker/u4:5 Not tainted 5.8.0-rc1-syzkaller #0 [ 62.363680][ T219] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.373737][ T219] Workqueue: netns cleanup_net [ 62.378494][ T219] Call Trace: [ 62.381788][ T219] dump_stack+0x18f/0x20d [ 62.386124][ T219] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.391677][ T219] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.397235][ T219] ? afs_put_call+0xa40/0xa40 [ 62.401934][ T219] print_address_description.constprop.0.cold+0xd3/0x413 [ 62.408975][ T219] ? vprintk_func+0x97/0x1a6 [ 62.414024][ T219] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.419607][ T219] kasan_report.cold+0x1f/0x37 [ 62.424383][ T219] ? rcu_read_lock_held_common+0x51/0xa0 [ 62.430015][ T219] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.437041][ T219] afs_wake_up_async_call+0x6aa/0x770 [ 62.443641][ T219] ? afs_close_socket+0x320/0x320 [ 62.448666][ T219] ? afs_put_call+0xa40/0xa40 [ 62.453358][ T219] rxrpc_notify_socket+0x1db/0x5d0 [ 62.458473][ T219] ? afs_put_call+0xa40/0xa40 [ 62.463236][ T219] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.469743][ T219] rxrpc_call_completed+0xca/0xf0 [ 62.474803][ T219] rxrpc_discard_prealloc+0x781/0xab0 [ 62.480179][ T219] ? lock_sock_nested+0x94/0x110 [ 62.485122][ T219] rxrpc_listen+0x147/0x360 [ 62.489626][ T219] afs_close_socket+0x95/0x320 [ 62.494412][ T219] ? afs_purge_servers+0x16d/0x300 [ 62.499537][ T219] ? afs_rx_discard_new_call+0x50/0x50 [ 62.505001][ T219] ? init_wait_var_entry+0x200/0x200 [ 62.510344][ T219] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.515973][ T219] ? check_preemption_disabled+0x38/0x220 [ 62.521695][ T219] afs_net_exit+0x1bc/0x310 [ 62.526199][ T219] ? afs_net_init+0xe30/0xe30 [ 62.530973][ T219] ops_exit_list.isra.0+0xa8/0x150 [ 62.536091][ T219] cleanup_net+0x511/0xa50 [ 62.540512][ T219] ? unregister_pernet_device+0x70/0x70 [ 62.546074][ T219] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.552073][ T219] process_one_work+0x965/0x1690 [ 62.557026][ T219] ? lock_release+0x800/0x800 [ 62.561709][ T219] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.567099][ T219] ? rwlock_bug.part.0+0x90/0x90 [ 62.572050][ T219] worker_thread+0x96/0xe10 [ 62.576567][ T219] ? process_one_work+0x1690/0x1690 [ 62.581764][ T219] kthread+0x3b5/0x4a0 [ 62.585847][ T219] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.591567][ T219] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.597309][ T219] ret_from_fork+0x1f/0x30 [ 62.601747][ T219] [ 62.604068][ T219] Allocated by task 6796: [ 62.608398][ T219] save_stack+0x1b/0x40 [ 62.612571][ T219] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 62.618197][ T219] kmem_cache_alloc_trace+0x153/0x7d0 [ 62.623561][ T219] afs_alloc_call+0x55/0x630 [ 62.628235][ T219] afs_charge_preallocation+0xe9/0x2d0 [ 62.633686][ T219] afs_open_socket+0x292/0x360 [ 62.638441][ T219] afs_net_init+0xa6c/0xe30 [ 62.642946][ T219] ops_init+0xaf/0x420 [ 62.647013][ T219] setup_net+0x2de/0x860 [ 62.651250][ T219] copy_net_ns+0x293/0x590 [ 62.655663][ T219] create_new_namespaces+0x3fb/0xb30 [ 62.660945][ T219] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 62.666576][ T219] ksys_unshare+0x43d/0x8e0 [ 62.671076][ T219] __x64_sys_unshare+0x2d/0x40 [ 62.675832][ T219] do_syscall_64+0x60/0xe0 [ 62.680593][ T219] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 62.686491][ T219] [ 62.688813][ T219] Freed by task 219: [ 62.692732][ T219] save_stack+0x1b/0x40 [ 62.696900][ T219] __kasan_slab_free+0xf7/0x140 [ 62.701837][ T219] kfree+0x109/0x2b0 [ 62.705749][ T219] afs_put_call+0x585/0xa40 [ 62.710248][ T219] rxrpc_discard_prealloc+0x764/0xab0 [ 62.715620][ T219] rxrpc_listen+0x147/0x360 [ 62.720149][ T219] afs_close_socket+0x95/0x320 [ 62.724932][ T219] afs_net_exit+0x1bc/0x310 [ 62.731904][ T219] ops_exit_list.isra.0+0xa8/0x150 [ 62.737731][ T219] cleanup_net+0x511/0xa50 [ 62.742150][ T219] process_one_work+0x965/0x1690 [ 62.747089][ T219] worker_thread+0x96/0xe10 [ 62.751611][ T219] kthread+0x3b5/0x4a0 [ 62.755675][ T219] ret_from_fork+0x1f/0x30 [ 62.760084][ T219] [ 62.762412][ T219] The buggy address belongs to the object at ffff88808224e000 [ 62.762412][ T219] which belongs to the cache kmalloc-1k of size 1024 [ 62.776459][ T219] The buggy address is located 484 bytes inside of [ 62.776459][ T219] 1024-byte region [ffff88808224e000, ffff88808224e400) [ 62.790174][ T219] The buggy address belongs to the page: [ 62.795816][ T219] page:ffffea0002089380 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 62.804920][ T219] flags: 0xfffe0000000200(slab) [ 62.809780][ T219] raw: 00fffe0000000200 ffffea00020892c8 ffffea00020893c8 ffff8880aa000c40 [ 62.818378][ T219] raw: 0000000000000000 ffff88808224e000 0000000100000002 0000000000000000 [ 62.826959][ T219] page dumped because: kasan: bad access detected [ 62.833363][ T219] [ 62.835704][ T219] Memory state around the buggy address: [ 62.841331][ T219] ffff88808224e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.849569][ T219] ffff88808224e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.857629][ T219] >ffff88808224e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.865696][ T219] ^ [ 62.872892][ T219] ffff88808224e200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.880956][ T219] ffff88808224e280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.889009][ T219] ================================================================== [ 62.897339][ T219] Disabling lock debugging due to kernel taint [ 62.903530][ T219] Kernel panic - not syncing: panic_on_warn set ... [ 62.910124][ T219] CPU: 0 PID: 219 Comm: kworker/u4:5 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 62.919829][ T219] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.929888][ T219] Workqueue: netns cleanup_net [ 62.934643][ T219] Call Trace: [ 62.937935][ T219] dump_stack+0x18f/0x20d [ 62.942261][ T219] ? afs_wake_up_async_call+0x680/0x770 [ 62.947798][ T219] ? afs_put_call+0xa40/0xa40 [ 62.952476][ T219] panic+0x2e3/0x75c [ 62.956368][ T219] ? __warn_printk+0xf3/0xf3 [ 62.960953][ T219] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 62.967101][ T219] ? trace_hardirqs_on+0x55/0x220 [ 62.972125][ T219] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.977658][ T219] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.983285][ T219] ? afs_put_call+0xa40/0xa40 [ 62.987957][ T219] end_report+0x4d/0x53 [ 62.992103][ T219] kasan_report.cold+0xd/0x37 [ 62.996786][ T219] ? rcu_read_lock_held_common+0x51/0xa0 [ 63.002411][ T219] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.007959][ T219] afs_wake_up_async_call+0x6aa/0x770 [ 63.013319][ T219] ? afs_close_socket+0x320/0x320 [ 63.018338][ T219] ? afs_put_call+0xa40/0xa40 [ 63.023442][ T219] rxrpc_notify_socket+0x1db/0x5d0 [ 63.028556][ T219] ? afs_put_call+0xa40/0xa40 [ 63.033254][ T219] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 63.040185][ T219] rxrpc_call_completed+0xca/0xf0 [ 63.045205][ T219] rxrpc_discard_prealloc+0x781/0xab0 [ 63.050582][ T219] ? lock_sock_nested+0x94/0x110 [ 63.055518][ T219] rxrpc_listen+0x147/0x360 [ 63.060080][ T219] afs_close_socket+0x95/0x320 [ 63.064863][ T219] ? afs_purge_servers+0x16d/0x300 [ 63.069967][ T219] ? afs_rx_discard_new_call+0x50/0x50 [ 63.075419][ T219] ? init_wait_var_entry+0x200/0x200 [ 63.080699][ T219] ? rcu_read_lock_held_common+0xa0/0xa0 [ 63.086327][ T219] ? check_preemption_disabled+0x38/0x220 [ 63.092040][ T219] afs_net_exit+0x1bc/0x310 [ 63.096542][ T219] ? afs_net_init+0xe30/0xe30 [ 63.101211][ T219] ops_exit_list.isra.0+0xa8/0x150 [ 63.106318][ T219] cleanup_net+0x511/0xa50 [ 63.110746][ T219] ? unregister_pernet_device+0x70/0x70 [ 63.116307][ T219] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.122285][ T219] process_one_work+0x965/0x1690 [ 63.127220][ T219] ? lock_release+0x800/0x800 [ 63.131936][ T219] ? pwq_dec_nr_in_flight+0x310/0x310 [ 63.137300][ T219] ? rwlock_bug.part.0+0x90/0x90 [ 63.142236][ T219] worker_thread+0x96/0xe10 [ 63.146737][ T219] ? process_one_work+0x1690/0x1690 [ 63.152015][ T219] kthread+0x3b5/0x4a0 [ 63.156074][ T219] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.161785][ T219] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.167502][ T219] ret_from_fork+0x1f/0x30 [ 63.173644][ T219] Kernel Offset: disabled [ 63.177961][ T219] Rebooting in 86400 seconds..