[ 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... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.36' (ECDSA) to the list of known hosts. 2020/06/19 05:34:32 fuzzer started 2020/06/19 05:34:33 connecting to host at 10.128.0.26:43473 2020/06/19 05:34:33 checking machine... 2020/06/19 05:34:33 checking revisions... 2020/06/19 05:34:33 testing simple program... syzkaller login: [ 58.590455][ T6818] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 05:34:33 building call list... [ 58.910082][ T190] tipc: TX() has been purged, node left! [ 59.431821][ T190] ================================================================== [ 59.440316][ T190] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 59.448198][ T190] Write of size 1 at addr ffff88809ea571e4 by task kworker/u4:5/190 [ 59.456178][ T190] [ 59.458522][ T190] CPU: 0 PID: 190 Comm: kworker/u4:5 Not tainted 5.8.0-rc1-next-20200618-syzkaller #0 [ 59.468051][ T190] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.478204][ T190] Workqueue: netns cleanup_net [ 59.483158][ T190] Call Trace: [ 59.486460][ T190] dump_stack+0x18f/0x20d [ 59.490791][ T190] ? afs_wake_up_async_call+0x6aa/0x770 [ 59.496332][ T190] ? afs_wake_up_async_call+0x6aa/0x770 [ 59.501871][ T190] ? afs_put_call+0xa40/0xa40 [ 59.506553][ T190] print_address_description.constprop.0.cold+0xd3/0x413 [ 59.513855][ T190] ? vprintk_func+0x97/0x1a6 [ 59.518709][ T190] ? afs_wake_up_async_call+0x6aa/0x770 [ 59.524287][ T190] kasan_report.cold+0x1f/0x37 [ 59.529051][ T190] ? rcu_read_lock_held_common+0x71/0xa0 [ 59.534676][ T190] ? afs_wake_up_async_call+0x6aa/0x770 [ 59.540323][ T190] afs_wake_up_async_call+0x6aa/0x770 [ 59.545877][ T190] ? afs_close_socket+0x320/0x320 [ 59.550994][ T190] ? afs_put_call+0xa40/0xa40 [ 59.557066][ T190] rxrpc_notify_socket+0x1db/0x5d0 [ 59.562183][ T190] ? afs_put_call+0xa40/0xa40 [ 59.568255][ T190] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 59.574688][ T190] rxrpc_call_completed+0xca/0xf0 [ 59.579913][ T190] rxrpc_discard_prealloc+0x781/0xab0 [ 59.585282][ T190] ? lock_sock_nested+0x94/0x110 [ 59.590218][ T190] rxrpc_listen+0x147/0x360 [ 59.594721][ T190] afs_close_socket+0x95/0x320 [ 59.599571][ T190] ? afs_purge_servers+0x16d/0x300 [ 59.604771][ T190] ? afs_rx_discard_new_call+0x50/0x50 [ 59.610231][ T190] ? init_wait_var_entry+0x200/0x200 [ 59.615516][ T190] ? rcu_read_lock_held_common+0xa0/0xa0 [ 59.621162][ T190] ? check_preemption_disabled+0x38/0x220 [ 59.627664][ T190] afs_net_exit+0x1bc/0x310 [ 59.632248][ T190] ? afs_net_init+0xe30/0xe30 [ 59.637022][ T190] ops_exit_list.isra.0+0xa8/0x150 [ 59.642924][ T190] cleanup_net+0x511/0xa50 [ 59.647345][ T190] ? unregister_pernet_device+0x70/0x70 [ 59.652917][ T190] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 59.658901][ T190] process_one_work+0x965/0x1690 [ 59.663932][ T190] ? lock_release+0x800/0x800 [ 59.668692][ T190] ? pwq_dec_nr_in_flight+0x310/0x310 [ 59.674066][ T190] ? rwlock_bug.part.0+0x90/0x90 [ 59.679019][ T190] worker_thread+0x96/0xe10 [ 59.683536][ T190] ? process_one_work+0x1690/0x1690 [ 59.688735][ T190] kthread+0x3b5/0x4a0 [ 59.693155][ T190] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 59.699040][ T190] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 59.704759][ T190] ret_from_fork+0x1f/0x30 [ 59.709279][ T190] [ 59.711600][ T190] Allocated by task 6818: [ 59.716008][ T190] save_stack+0x1b/0x40 [ 59.720156][ T190] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 59.725796][ T190] kmem_cache_alloc_trace+0x153/0x7d0 [ 59.731160][ T190] afs_alloc_call+0x55/0x630 [ 59.735754][ T190] afs_charge_preallocation+0xe9/0x2d0 [ 59.743049][ T190] afs_open_socket+0x292/0x360 [ 59.747811][ T190] afs_net_init+0xa6c/0xe30 [ 59.752394][ T190] ops_init+0xaf/0x420 [ 59.756726][ T190] setup_net+0x2de/0x860 [ 59.760968][ T190] copy_net_ns+0x293/0x590 [ 59.765379][ T190] create_new_namespaces+0x3fb/0xb30 [ 59.770659][ T190] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 59.776290][ T190] ksys_unshare+0x445/0x8e0 [ 59.780807][ T190] __x64_sys_unshare+0x2d/0x40 [ 59.785581][ T190] do_syscall_64+0x60/0xe0 [ 59.789997][ T190] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.795884][ T190] [ 59.799586][ T190] Freed by task 190: [ 59.804207][ T190] save_stack+0x1b/0x40 [ 59.808436][ T190] __kasan_slab_free+0xf7/0x140 [ 59.813288][ T190] kfree+0x109/0x2b0 [ 59.817186][ T190] afs_put_call+0x585/0xa40 [ 59.821690][ T190] rxrpc_discard_prealloc+0x764/0xab0 [ 59.827226][ T190] rxrpc_listen+0x147/0x360 [ 59.831730][ T190] afs_close_socket+0x95/0x320 [ 59.836572][ T190] afs_net_exit+0x1bc/0x310 [ 59.841330][ T190] ops_exit_list.isra.0+0xa8/0x150 [ 59.846525][ T190] cleanup_net+0x511/0xa50 [ 59.850965][ T190] process_one_work+0x965/0x1690 [ 59.856331][ T190] worker_thread+0x96/0xe10 [ 59.860940][ T190] kthread+0x3b5/0x4a0 [ 59.865885][ T190] ret_from_fork+0x1f/0x30 [ 59.870647][ T190] [ 59.872989][ T190] The buggy address belongs to the object at ffff88809ea57000 [ 59.872989][ T190] which belongs to the cache kmalloc-1k of size 1024 [ 59.887318][ T190] The buggy address is located 484 bytes inside of [ 59.887318][ T190] 1024-byte region [ffff88809ea57000, ffff88809ea57400) [ 59.900681][ T190] The buggy address belongs to the page: [ 59.906345][ T190] page:ffffea00027a95c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 59.915467][ T190] flags: 0xfffe0000000200(slab) [ 59.920433][ T190] raw: 00fffe0000000200 ffffea000269e648 ffffea00025e6248 ffff8880aa000c40 [ 59.930026][ T190] raw: 0000000000000000 ffff88809ea57000 0000000100000002 0000000000000000 [ 59.938869][ T190] page dumped because: kasan: bad access detected [ 59.945548][ T190] [ 59.947930][ T190] Memory state around the buggy address: [ 59.953642][ T190] ffff88809ea57080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.961793][ T190] ffff88809ea57100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.971613][ T190] >ffff88809ea57180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.980376][ T190] ^ [ 59.987740][ T190] ffff88809ea57200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.995811][ T190] ffff88809ea57280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.004039][ T190] ================================================================== [ 60.012153][ T190] Disabling lock debugging due to kernel taint [ 60.018357][ T190] Kernel panic - not syncing: panic_on_warn set ... [ 60.024941][ T190] CPU: 0 PID: 190 Comm: kworker/u4:5 Tainted: G B 5.8.0-rc1-next-20200618-syzkaller #0 [ 60.035856][ T190] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.046271][ T190] Workqueue: netns cleanup_net [ 60.052187][ T190] Call Trace: [ 60.055486][ T190] dump_stack+0x18f/0x20d [ 60.059819][ T190] ? afs_wake_up_async_call+0x660/0x770 [ 60.065624][ T190] ? afs_put_call+0xa40/0xa40 [ 60.071093][ T190] panic+0x2e3/0x75c [ 60.076879][ T190] ? __warn_printk+0xf3/0xf3 [ 60.081548][ T190] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 60.087707][ T190] ? trace_hardirqs_on+0x55/0x220 [ 60.092729][ T190] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.098434][ T190] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.103968][ T190] ? afs_put_call+0xa40/0xa40 [ 60.108635][ T190] end_report+0x4d/0x53 [ 60.112955][ T190] kasan_report.cold+0xd/0x37 [ 60.124148][ T190] ? rcu_read_lock_held_common+0x71/0xa0 [ 60.129782][ T190] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.135682][ T190] afs_wake_up_async_call+0x6aa/0x770 [ 60.141054][ T190] ? afs_close_socket+0x320/0x320 [ 60.146099][ T190] ? afs_put_call+0xa40/0xa40 [ 60.150796][ T190] rxrpc_notify_socket+0x1db/0x5d0 [ 60.155924][ T190] ? afs_put_call+0xa40/0xa40 [ 60.160587][ T190] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 60.166991][ T190] rxrpc_call_completed+0xca/0xf0 [ 60.172006][ T190] rxrpc_discard_prealloc+0x781/0xab0 [ 60.177376][ T190] ? lock_sock_nested+0x94/0x110 [ 60.182394][ T190] rxrpc_listen+0x147/0x360 [ 60.186906][ T190] afs_close_socket+0x95/0x320 [ 60.191874][ T190] ? afs_purge_servers+0x16d/0x300 [ 60.196982][ T190] ? afs_rx_discard_new_call+0x50/0x50 [ 60.202552][ T190] ? init_wait_var_entry+0x200/0x200 [ 60.208192][ T190] ? rcu_read_lock_held_common+0xa0/0xa0 [ 60.213902][ T190] ? check_preemption_disabled+0x38/0x220 [ 60.219616][ T190] afs_net_exit+0x1bc/0x310 [ 60.224114][ T190] ? afs_net_init+0xe30/0xe30 [ 60.228786][ T190] ops_exit_list.isra.0+0xa8/0x150 [ 60.233973][ T190] cleanup_net+0x511/0xa50 [ 60.238385][ T190] ? unregister_pernet_device+0x70/0x70 [ 60.243926][ T190] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 60.249999][ T190] process_one_work+0x965/0x1690 [ 60.255252][ T190] ? lock_release+0x800/0x800 [ 60.259921][ T190] ? pwq_dec_nr_in_flight+0x310/0x310 [ 60.265291][ T190] ? rwlock_bug.part.0+0x90/0x90 [ 60.272224][ T190] worker_thread+0x96/0xe10 [ 60.276741][ T190] ? process_one_work+0x1690/0x1690 [ 60.281945][ T190] kthread+0x3b5/0x4a0 [ 60.286009][ T190] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 60.291720][ T190] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 60.297442][ T190] ret_from_fork+0x1f/0x30 [ 60.303227][ T190] Kernel Offset: disabled [ 60.307546][ T190] Rebooting in 86400 seconds..