Warning: Permanently added '10.128.10.25' (ECDSA) to the list of known hosts. 2020/06/19 06:29:09 fuzzer started 2020/06/19 06:29:09 connecting to host at 10.128.0.26:35639 2020/06/19 06:29:09 checking machine... 2020/06/19 06:29:09 checking revisions... 2020/06/19 06:29:09 testing simple program... syzkaller login: [ 60.213500][ T6800] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 06:29:10 building call list... [ 60.543268][ T26] tipc: TX() has been purged, node left! [ 61.065146][ T26] ================================================================== [ 61.073420][ T26] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 61.081311][ T26] Write of size 1 at addr ffff88809469d1e4 by task kworker/u4:2/26 [ 61.089204][ T26] [ 61.091541][ T26] CPU: 0 PID: 26 Comm: kworker/u4:2 Not tainted 5.8.0-rc1-syzkaller #0 [ 61.099786][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.111325][ T26] Workqueue: netns cleanup_net [ 61.116101][ T26] Call Trace: [ 61.119420][ T26] dump_stack+0x18f/0x20d [ 61.123755][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.129301][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.134931][ T26] ? afs_put_call+0xa40/0xa40 [ 61.139632][ T26] print_address_description.constprop.0.cold+0xd3/0x413 [ 61.146790][ T26] ? vprintk_func+0x97/0x1a6 [ 61.151397][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.156972][ T26] kasan_report.cold+0x1f/0x37 [ 61.161745][ T26] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.167400][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.173036][ T26] afs_wake_up_async_call+0x6aa/0x770 [ 61.178496][ T26] ? afs_close_socket+0x320/0x320 [ 61.183609][ T26] ? afs_put_call+0xa40/0xa40 [ 61.188307][ T26] rxrpc_notify_socket+0x1db/0x5d0 [ 61.193454][ T26] ? afs_put_call+0xa40/0xa40 [ 61.198134][ T26] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.204572][ T26] rxrpc_call_completed+0xca/0xf0 [ 61.209690][ T26] rxrpc_discard_prealloc+0x781/0xab0 [ 61.215069][ T26] ? lock_sock_nested+0x94/0x110 [ 61.220011][ T26] rxrpc_listen+0x147/0x360 [ 61.224517][ T26] afs_close_socket+0x95/0x320 [ 61.229279][ T26] ? afs_purge_servers+0x16d/0x300 [ 61.234396][ T26] ? afs_rx_discard_new_call+0x50/0x50 [ 61.239990][ T26] ? init_wait_var_entry+0x200/0x200 [ 61.245293][ T26] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.250925][ T26] ? check_preemption_disabled+0x38/0x220 [ 61.256655][ T26] afs_net_exit+0x1bc/0x310 [ 61.261158][ T26] ? afs_net_init+0xe30/0xe30 [ 61.265836][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 61.270949][ T26] cleanup_net+0x511/0xa50 [ 61.275390][ T26] ? unregister_pernet_device+0x70/0x70 [ 61.281025][ T26] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.287096][ T26] process_one_work+0x965/0x1690 [ 61.292058][ T26] ? lock_release+0x800/0x800 [ 61.296735][ T26] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.302115][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 61.307083][ T26] worker_thread+0x96/0xe10 [ 61.311619][ T26] ? process_one_work+0x1690/0x1690 [ 61.316819][ T26] kthread+0x3b5/0x4a0 [ 61.320902][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.326619][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.332342][ T26] ret_from_fork+0x1f/0x30 [ 61.336797][ T26] [ 61.339124][ T26] Allocated by task 6800: [ 61.343457][ T26] save_stack+0x1b/0x40 [ 61.347625][ T26] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 61.353259][ T26] kmem_cache_alloc_trace+0x153/0x7d0 [ 61.358634][ T26] afs_alloc_call+0x55/0x630 [ 61.363218][ T26] afs_charge_preallocation+0xe9/0x2d0 [ 61.368669][ T26] afs_open_socket+0x292/0x360 [ 61.373424][ T26] afs_net_init+0xa6c/0xe30 [ 61.377921][ T26] ops_init+0xaf/0x420 [ 61.381978][ T26] setup_net+0x2de/0x860 [ 61.386233][ T26] copy_net_ns+0x293/0x590 [ 61.390645][ T26] create_new_namespaces+0x3fb/0xb30 [ 61.395925][ T26] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 61.402767][ T26] ksys_unshare+0x43d/0x8e0 [ 61.407265][ T26] __x64_sys_unshare+0x2d/0x40 [ 61.412034][ T26] do_syscall_64+0x60/0xe0 [ 61.416451][ T26] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.422328][ T26] [ 61.425178][ T26] Freed by task 26: [ 61.429698][ T26] save_stack+0x1b/0x40 [ 61.433848][ T26] __kasan_slab_free+0xf7/0x140 [ 61.438690][ T26] kfree+0x109/0x2b0 [ 61.442753][ T26] afs_put_call+0x585/0xa40 [ 61.447253][ T26] rxrpc_discard_prealloc+0x764/0xab0 [ 61.452621][ T26] rxrpc_listen+0x147/0x360 [ 61.457215][ T26] afs_close_socket+0x95/0x320 [ 61.461973][ T26] afs_net_exit+0x1bc/0x310 [ 61.466473][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 61.471578][ T26] cleanup_net+0x511/0xa50 [ 61.476005][ T26] process_one_work+0x965/0x1690 [ 61.481156][ T26] worker_thread+0x96/0xe10 [ 61.485715][ T26] kthread+0x3b5/0x4a0 [ 61.489813][ T26] ret_from_fork+0x1f/0x30 [ 61.494234][ T26] [ 61.496581][ T26] The buggy address belongs to the object at ffff88809469d000 [ 61.496581][ T26] which belongs to the cache kmalloc-1k of size 1024 [ 61.511535][ T26] The buggy address is located 484 bytes inside of [ 61.511535][ T26] 1024-byte region [ffff88809469d000, ffff88809469d400) [ 61.525942][ T26] The buggy address belongs to the page: [ 61.531590][ T26] page:ffffea000251a740 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 61.541566][ T26] flags: 0xfffe0000000200(slab) [ 61.546611][ T26] raw: 00fffe0000000200 ffffea00029b9a08 ffffea00028aa088 ffff8880aa000c40 [ 61.555197][ T26] raw: 0000000000000000 ffff88809469d000 0000000100000002 0000000000000000 [ 61.563776][ T26] page dumped because: kasan: bad access detected [ 61.570355][ T26] [ 61.572692][ T26] Memory state around the buggy address: [ 61.578697][ T26] ffff88809469d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.586755][ T26] ffff88809469d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.594813][ T26] >ffff88809469d180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.603300][ T26] ^ [ 61.610491][ T26] ffff88809469d200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.618567][ T26] ffff88809469d280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.626614][ T26] ================================================================== [ 61.634770][ T26] Disabling lock debugging due to kernel taint [ 61.640978][ T26] Kernel panic - not syncing: panic_on_warn set ... [ 61.647675][ T26] CPU: 0 PID: 26 Comm: kworker/u4:2 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 61.657469][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.667527][ T26] Workqueue: netns cleanup_net [ 61.672283][ T26] Call Trace: [ 61.675571][ T26] dump_stack+0x18f/0x20d [ 61.679915][ T26] ? afs_wake_up_async_call+0x670/0x770 [ 61.685454][ T26] ? afs_put_call+0xa40/0xa40 [ 61.690129][ T26] panic+0x2e3/0x75c [ 61.694024][ T26] ? __warn_printk+0xf3/0xf3 [ 61.698608][ T26] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 61.704761][ T26] ? trace_hardirqs_on+0x55/0x220 [ 61.709783][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.715329][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.720863][ T26] ? afs_put_call+0xa40/0xa40 [ 61.725534][ T26] end_report+0x4d/0x53 [ 61.729686][ T26] kasan_report.cold+0xd/0x37 [ 61.734357][ T26] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.739976][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.745511][ T26] afs_wake_up_async_call+0x6aa/0x770 [ 61.750871][ T26] ? afs_close_socket+0x320/0x320 [ 61.755915][ T26] ? afs_put_call+0xa40/0xa40 [ 61.760584][ T26] rxrpc_notify_socket+0x1db/0x5d0 [ 61.765794][ T26] ? afs_put_call+0xa40/0xa40 [ 61.770480][ T26] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.776978][ T26] rxrpc_call_completed+0xca/0xf0 [ 61.782018][ T26] rxrpc_discard_prealloc+0x781/0xab0 [ 61.787387][ T26] ? lock_sock_nested+0x94/0x110 [ 61.792331][ T26] rxrpc_listen+0x147/0x360 [ 61.796829][ T26] afs_close_socket+0x95/0x320 [ 61.801594][ T26] ? afs_purge_servers+0x16d/0x300 [ 61.806808][ T26] ? afs_rx_discard_new_call+0x50/0x50 [ 61.812267][ T26] ? init_wait_var_entry+0x200/0x200 [ 61.817548][ T26] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.823174][ T26] ? check_preemption_disabled+0x38/0x220 [ 61.828892][ T26] afs_net_exit+0x1bc/0x310 [ 61.833392][ T26] ? afs_net_init+0xe30/0xe30 [ 61.838068][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 61.843182][ T26] cleanup_net+0x511/0xa50 [ 61.847869][ T26] ? unregister_pernet_device+0x70/0x70 [ 61.853438][ T26] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.859427][ T26] process_one_work+0x965/0x1690 [ 61.864363][ T26] ? lock_release+0x800/0x800 [ 61.869034][ T26] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.874400][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 61.879339][ T26] worker_thread+0x96/0xe10 [ 61.883847][ T26] ? process_one_work+0x1690/0x1690 [ 61.889037][ T26] kthread+0x3b5/0x4a0 [ 61.893101][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.898810][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.904547][ T26] ret_from_fork+0x1f/0x30 [ 61.910466][ T26] Kernel Offset: disabled [ 61.914802][ T26] Rebooting in 86400 seconds..