Warning: Permanently added '10.128.10.58' (ECDSA) to the list of known hosts. 2020/06/18 08:53:08 fuzzer started 2020/06/18 08:53:08 connecting to host at 10.128.0.26:33887 2020/06/18 08:53:08 checking machine... 2020/06/18 08:53:08 checking revisions... 2020/06/18 08:53:08 testing simple program... syzkaller login: [ 61.718824][ T6811] IPVS: ftp: loaded support on port[0] = 21 2020/06/18 08:53:09 building call list... [ 62.063519][ T7] tipc: TX() has been purged, node left! [ 62.555589][ T7] ================================================================== [ 62.563902][ T7] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 62.571784][ T7] Write of size 1 at addr ffff888097adb1e4 by task kworker/u4:0/7 [ 62.579570][ T7] [ 62.581902][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc1-syzkaller #0 [ 62.590043][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.600095][ T7] Workqueue: netns cleanup_net [ 62.604850][ T7] Call Trace: [ 62.608138][ T7] dump_stack+0x18f/0x20d [ 62.612988][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.618528][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.624092][ T7] ? afs_put_call+0xa40/0xa40 [ 62.628765][ T7] print_address_description.constprop.0.cold+0xd3/0x413 [ 62.635880][ T7] ? vprintk_func+0x97/0x1a6 [ 62.640475][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.646016][ T7] kasan_report.cold+0x1f/0x37 [ 62.650781][ T7] ? rcu_read_lock_held_common+0x51/0xa0 [ 62.657013][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.662563][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 62.667929][ T7] ? afs_close_socket+0x320/0x320 [ 62.672953][ T7] ? afs_put_call+0xa40/0xa40 [ 62.677637][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 62.682755][ T7] ? afs_put_call+0xa40/0xa40 [ 62.687428][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.695870][ T7] rxrpc_call_completed+0xca/0xf0 [ 62.700896][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 62.706270][ T7] ? lock_sock_nested+0x94/0x110 [ 62.711230][ T7] rxrpc_listen+0x147/0x360 [ 62.715734][ T7] afs_close_socket+0x95/0x320 [ 62.720494][ T7] ? afs_purge_servers+0x16d/0x300 [ 62.725600][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 62.731150][ T7] ? init_wait_var_entry+0x200/0x200 [ 62.736435][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.742071][ T7] ? check_preemption_disabled+0x38/0x220 [ 62.747796][ T7] afs_net_exit+0x1bc/0x310 [ 62.752306][ T7] ? afs_net_init+0xe30/0xe30 [ 62.756980][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 62.762090][ T7] cleanup_net+0x511/0xa50 [ 62.767722][ T7] ? unregister_pernet_device+0x70/0x70 [ 62.773281][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.779267][ T7] process_one_work+0x965/0x1690 [ 62.784839][ T7] ? lock_release+0x800/0x800 [ 62.789519][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.794895][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 62.799844][ T7] worker_thread+0x96/0xe10 [ 62.804363][ T7] ? process_one_work+0x1690/0x1690 [ 62.809557][ T7] kthread+0x3b5/0x4a0 [ 62.813624][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.819340][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.825058][ T7] ret_from_fork+0x1f/0x30 [ 62.829486][ T7] [ 62.831806][ T7] Allocated by task 6811: [ 62.836130][ T7] save_stack+0x1b/0x40 [ 62.840288][ T7] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 62.845918][ T7] kmem_cache_alloc_trace+0x153/0x7d0 [ 62.851283][ T7] afs_alloc_call+0x55/0x630 [ 62.855879][ T7] afs_charge_preallocation+0xe9/0x2d0 [ 62.861336][ T7] afs_open_socket+0x292/0x360 [ 62.866099][ T7] afs_net_init+0xa6c/0xe30 [ 62.870599][ T7] ops_init+0xaf/0x420 [ 62.874665][ T7] setup_net+0x2de/0x860 [ 62.878909][ T7] copy_net_ns+0x293/0x590 [ 62.883322][ T7] create_new_namespaces+0x3fb/0xb30 [ 62.888604][ T7] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 62.894230][ T7] ksys_unshare+0x43d/0x8e0 [ 62.898729][ T7] __x64_sys_unshare+0x2d/0x40 [ 62.903485][ T7] do_syscall_64+0x60/0xe0 [ 62.907917][ T7] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 62.913794][ T7] [ 62.916118][ T7] Freed by task 7: [ 62.919837][ T7] save_stack+0x1b/0x40 [ 62.923986][ T7] __kasan_slab_free+0xf7/0x140 [ 62.928829][ T7] kfree+0x109/0x2b0 [ 62.932716][ T7] afs_put_call+0x585/0xa40 [ 62.937390][ T7] rxrpc_discard_prealloc+0x764/0xab0 [ 62.942754][ T7] rxrpc_listen+0x147/0x360 [ 62.947266][ T7] afs_close_socket+0x95/0x320 [ 62.952023][ T7] afs_net_exit+0x1bc/0x310 [ 62.956518][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 62.961635][ T7] cleanup_net+0x511/0xa50 [ 62.966047][ T7] process_one_work+0x965/0x1690 [ 62.970977][ T7] worker_thread+0x96/0xe10 [ 62.975587][ T7] kthread+0x3b5/0x4a0 [ 62.979652][ T7] ret_from_fork+0x1f/0x30 [ 62.984093][ T7] [ 62.986435][ T7] The buggy address belongs to the object at ffff888097adb000 [ 62.986435][ T7] which belongs to the cache kmalloc-1k of size 1024 [ 63.000488][ T7] The buggy address is located 484 bytes inside of [ 63.000488][ T7] 1024-byte region [ffff888097adb000, ffff888097adb400) [ 63.013837][ T7] The buggy address belongs to the page: [ 63.019472][ T7] page:ffffea00025eb6c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 63.028575][ T7] flags: 0xfffe0000000200(slab) [ 63.033429][ T7] raw: 00fffe0000000200 ffffea000261ee48 ffffea000289a988 ffff8880aa000c40 [ 63.042012][ T7] raw: 0000000000000000 ffff888097adb000 0000000100000002 0000000000000000 [ 63.050584][ T7] page dumped because: kasan: bad access detected [ 63.056988][ T7] [ 63.059306][ T7] Memory state around the buggy address: [ 63.064929][ T7] ffff888097adb080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.072982][ T7] ffff888097adb100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.081037][ T7] >ffff888097adb180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.089086][ T7] ^ [ 63.096273][ T7] ffff888097adb200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.104332][ T7] ffff888097adb280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.112382][ T7] ================================================================== [ 63.120428][ T7] Disabling lock debugging due to kernel taint [ 63.126628][ T7] Kernel panic - not syncing: panic_on_warn set ... [ 63.133213][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 63.142749][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.152989][ T7] Workqueue: netns cleanup_net [ 63.157746][ T7] Call Trace: [ 63.161119][ T7] dump_stack+0x18f/0x20d [ 63.165447][ T7] ? afs_wake_up_async_call+0x680/0x770 [ 63.170999][ T7] ? afs_put_call+0xa40/0xa40 [ 63.175678][ T7] panic+0x2e3/0x75c [ 63.179575][ T7] ? __warn_printk+0xf3/0xf3 [ 63.184251][ T7] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 63.190401][ T7] ? trace_hardirqs_on+0x55/0x220 [ 63.195409][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.200936][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.206462][ T7] ? afs_put_call+0xa40/0xa40 [ 63.215684][ T7] end_report+0x4d/0x53 [ 63.219931][ T7] kasan_report.cold+0xd/0x37 [ 63.224614][ T7] ? rcu_read_lock_held_common+0x51/0xa0 [ 63.230232][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.235771][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 63.241223][ T7] ? afs_close_socket+0x320/0x320 [ 63.246232][ T7] ? afs_put_call+0xa40/0xa40 [ 63.251054][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 63.256274][ T7] ? afs_put_call+0xa40/0xa40 [ 63.261273][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 63.267745][ T7] rxrpc_call_completed+0xca/0xf0 [ 63.272771][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 63.278136][ T7] ? lock_sock_nested+0x94/0x110 [ 63.283056][ T7] rxrpc_listen+0x147/0x360 [ 63.287557][ T7] afs_close_socket+0x95/0x320 [ 63.292310][ T7] ? afs_purge_servers+0x16d/0x300 [ 63.297413][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 63.302884][ T7] ? init_wait_var_entry+0x200/0x200 [ 63.308158][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 63.313782][ T7] ? check_preemption_disabled+0x38/0x220 [ 63.319490][ T7] afs_net_exit+0x1bc/0x310 [ 63.323983][ T7] ? afs_net_init+0xe30/0xe30 [ 63.328647][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 63.333746][ T7] cleanup_net+0x511/0xa50 [ 63.339022][ T7] ? unregister_pernet_device+0x70/0x70 [ 63.344553][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.350524][ T7] process_one_work+0x965/0x1690 [ 63.355535][ T7] ? lock_release+0x800/0x800 [ 63.360213][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 63.365568][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 63.370503][ T7] worker_thread+0x96/0xe10 [ 63.374995][ T7] ? process_one_work+0x1690/0x1690 [ 63.380447][ T7] kthread+0x3b5/0x4a0 [ 63.384509][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.390216][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.395916][ T7] ret_from_fork+0x1f/0x30 [ 63.401823][ T7] Kernel Offset: disabled [ 63.406148][ T7] Rebooting in 86400 seconds..