Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.193' (ECDSA) to the list of known hosts. 2020/06/15 09:07:39 fuzzer started 2020/06/15 09:07:40 connecting to host at 10.128.0.26:45681 2020/06/15 09:07:40 checking machine... 2020/06/15 09:07:40 checking revisions... 2020/06/15 09:07:40 testing simple program... syzkaller login: [ 60.656996][ T6828] IPVS: ftp: loaded support on port[0] = 21 2020/06/15 09:07:40 building call list... [ 60.978789][ T21] tipc: TX() has been purged, node left! [ 61.490520][ T21] ================================================================== [ 61.498776][ T21] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 61.506661][ T21] Write of size 1 at addr ffff88809bc7f1e4 by task kworker/u4:1/21 [ 61.514536][ T21] [ 61.516870][ T21] CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.8.0-rc1-next-20200615-syzkaller #0 [ 61.526314][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.536455][ T21] Workqueue: netns cleanup_net [ 61.541207][ T21] Call Trace: [ 61.544499][ T21] dump_stack+0x18f/0x20d [ 61.548844][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.554398][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.559974][ T21] ? afs_put_call+0xa40/0xa40 [ 61.564653][ T21] print_address_description.constprop.0.cold+0xd3/0x413 [ 61.571694][ T21] ? vprintk_func+0x97/0x1a6 [ 61.576300][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.581873][ T21] kasan_report.cold+0x1f/0x37 [ 61.586738][ T21] ? rcu_read_lock_held_common+0x71/0xa0 [ 61.592371][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.597922][ T21] afs_wake_up_async_call+0x6aa/0x770 [ 61.603292][ T21] ? afs_close_socket+0x320/0x320 [ 61.608316][ T21] ? afs_put_call+0xa40/0xa40 [ 61.612992][ T21] rxrpc_notify_socket+0x1db/0x5d0 [ 61.618108][ T21] ? afs_put_call+0xa40/0xa40 [ 61.622782][ T21] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.629234][ T21] rxrpc_call_completed+0xca/0xf0 [ 61.634260][ T21] rxrpc_discard_prealloc+0x781/0xab0 [ 61.639639][ T21] ? lock_sock_nested+0x94/0x110 [ 61.644592][ T21] rxrpc_listen+0x147/0x360 [ 61.649187][ T21] afs_close_socket+0x95/0x320 [ 61.653977][ T21] ? afs_purge_servers+0x16d/0x300 [ 61.659106][ T21] ? afs_rx_discard_new_call+0x50/0x50 [ 61.664579][ T21] ? init_wait_var_entry+0x200/0x200 [ 61.669866][ T21] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.675496][ T21] ? check_preemption_disabled+0x38/0x220 [ 61.681228][ T21] afs_net_exit+0x1bc/0x310 [ 61.685730][ T21] ? afs_net_init+0xe30/0xe30 [ 61.690403][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 61.695516][ T21] cleanup_net+0x511/0xa50 [ 61.699934][ T21] ? unregister_pernet_device+0x70/0x70 [ 61.705482][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.711488][ T21] process_one_work+0x965/0x1690 [ 61.716436][ T21] ? lock_release+0x800/0x800 [ 61.721130][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.726522][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 61.731480][ T21] worker_thread+0x96/0xe10 [ 61.736005][ T21] ? process_one_work+0x1690/0x1690 [ 61.741207][ T21] kthread+0x3b5/0x4a0 [ 61.745270][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.750985][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.756709][ T21] ret_from_fork+0x1f/0x30 [ 61.761133][ T21] [ 61.763453][ T21] Allocated by task 6828: [ 61.767779][ T21] save_stack+0x1b/0x40 [ 61.772018][ T21] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 61.777649][ T21] kmem_cache_alloc_trace+0x153/0x7d0 [ 61.783016][ T21] afs_alloc_call+0x55/0x630 [ 61.787632][ T21] afs_charge_preallocation+0xe9/0x2d0 [ 61.793086][ T21] afs_open_socket+0x292/0x360 [ 61.797846][ T21] afs_net_init+0xa6c/0xe30 [ 61.802356][ T21] ops_init+0xaf/0x420 [ 61.806418][ T21] setup_net+0x2de/0x860 [ 61.810657][ T21] copy_net_ns+0x293/0x590 [ 61.815209][ T21] create_new_namespaces+0x3fb/0xb30 [ 61.820488][ T21] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 61.826114][ T21] ksys_unshare+0x43d/0x8e0 [ 61.830612][ T21] __x64_sys_unshare+0x2d/0x40 [ 61.835372][ T21] do_syscall_64+0x60/0xe0 [ 61.839792][ T21] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.846277][ T21] [ 61.848600][ T21] Freed by task 21: [ 61.854516][ T21] save_stack+0x1b/0x40 [ 61.858677][ T21] __kasan_slab_free+0xf7/0x140 [ 61.863521][ T21] kfree+0x109/0x2b0 [ 61.867411][ T21] afs_put_call+0x585/0xa40 [ 61.871920][ T21] rxrpc_discard_prealloc+0x764/0xab0 [ 61.877295][ T21] rxrpc_listen+0x147/0x360 [ 61.881873][ T21] afs_close_socket+0x95/0x320 [ 61.886655][ T21] afs_net_exit+0x1bc/0x310 [ 61.891162][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 61.896280][ T21] cleanup_net+0x511/0xa50 [ 61.900697][ T21] process_one_work+0x965/0x1690 [ 61.905629][ T21] worker_thread+0x96/0xe10 [ 61.910127][ T21] kthread+0x3b5/0x4a0 [ 61.914194][ T21] ret_from_fork+0x1f/0x30 [ 61.918600][ T21] [ 61.920930][ T21] The buggy address belongs to the object at ffff88809bc7f000 [ 61.920930][ T21] which belongs to the cache kmalloc-1k of size 1024 [ 61.935001][ T21] The buggy address is located 484 bytes inside of [ 61.935001][ T21] 1024-byte region [ffff88809bc7f000, ffff88809bc7f400) [ 61.948367][ T21] The buggy address belongs to the page: [ 61.954035][ T21] page:ffffea00026f1fc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 61.963255][ T21] flags: 0xfffe0000000200(slab) [ 61.968108][ T21] raw: 00fffe0000000200 ffffea00025e8d88 ffffea000257d048 ffff8880aa000c40 [ 61.976803][ T21] raw: 0000000000000000 ffff88809bc7f000 0000000100000002 0000000000000000 [ 61.985378][ T21] page dumped because: kasan: bad access detected [ 61.991777][ T21] [ 61.994096][ T21] Memory state around the buggy address: [ 61.999721][ T21] ffff88809bc7f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.007789][ T21] ffff88809bc7f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.015845][ T21] >ffff88809bc7f180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.023917][ T21] ^ [ 62.031105][ T21] ffff88809bc7f200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.039247][ T21] ffff88809bc7f280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.047297][ T21] ================================================================== [ 62.055360][ T21] Disabling lock debugging due to kernel taint [ 62.061574][ T21] Kernel panic - not syncing: panic_on_warn set ... [ 62.068160][ T21] CPU: 1 PID: 21 Comm: kworker/u4:1 Tainted: G B 5.8.0-rc1-next-20200615-syzkaller #0 [ 62.079013][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.089075][ T21] Workqueue: netns cleanup_net [ 62.093832][ T21] Call Trace: [ 62.097123][ T21] dump_stack+0x18f/0x20d [ 62.101455][ T21] ? afs_wake_up_async_call+0x660/0x770 [ 62.107029][ T21] ? afs_put_call+0xa40/0xa40 [ 62.111699][ T21] panic+0x2e3/0x75c [ 62.115600][ T21] ? __warn_printk+0xf3/0xf3 [ 62.120186][ T21] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 62.126331][ T21] ? trace_hardirqs_on+0x55/0x220 [ 62.131342][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.136871][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.142417][ T21] ? afs_put_call+0xa40/0xa40 [ 62.147079][ T21] end_report+0x4d/0x53 [ 62.151328][ T21] kasan_report.cold+0xd/0x37 [ 62.156111][ T21] ? rcu_read_lock_held_common+0x71/0xa0 [ 62.161737][ T21] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.167286][ T21] afs_wake_up_async_call+0x6aa/0x770 [ 62.176644][ T21] ? afs_close_socket+0x320/0x320 [ 62.181663][ T21] ? afs_put_call+0xa40/0xa40 [ 62.186326][ T21] rxrpc_notify_socket+0x1db/0x5d0 [ 62.191439][ T21] ? afs_put_call+0xa40/0xa40 [ 62.196093][ T21] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.202504][ T21] rxrpc_call_completed+0xca/0xf0 [ 62.207521][ T21] rxrpc_discard_prealloc+0x781/0xab0 [ 62.212901][ T21] ? lock_sock_nested+0x94/0x110 [ 62.217832][ T21] rxrpc_listen+0x147/0x360 [ 62.222319][ T21] afs_close_socket+0x95/0x320 [ 62.227082][ T21] ? afs_purge_servers+0x16d/0x300 [ 62.232244][ T21] ? afs_rx_discard_new_call+0x50/0x50 [ 62.237712][ T21] ? init_wait_var_entry+0x200/0x200 [ 62.243029][ T21] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.248654][ T21] ? check_preemption_disabled+0x38/0x220 [ 62.255180][ T21] afs_net_exit+0x1bc/0x310 [ 62.261730][ T21] ? afs_net_init+0xe30/0xe30 [ 62.266408][ T21] ops_exit_list.isra.0+0xa8/0x150 [ 62.271536][ T21] cleanup_net+0x511/0xa50 [ 62.276107][ T21] ? unregister_pernet_device+0x70/0x70 [ 62.281652][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.287626][ T21] process_one_work+0x965/0x1690 [ 62.292579][ T21] ? lock_release+0x800/0x800 [ 62.297264][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.302640][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 62.307655][ T21] worker_thread+0x96/0xe10 [ 62.312161][ T21] ? process_one_work+0x1690/0x1690 [ 62.317367][ T21] kthread+0x3b5/0x4a0 [ 62.321421][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.327157][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.332958][ T21] ret_from_fork+0x1f/0x30 [ 62.338793][ T21] Kernel Offset: disabled [ 62.343128][ T21] Rebooting in 86400 seconds..