Warning: Permanently added '10.128.0.104' (ECDSA) to the list of known hosts. 2020/06/19 04:01:24 fuzzer started 2020/06/19 04:01:25 connecting to host at 10.128.0.26:38795 2020/06/19 04:01:25 checking machine... 2020/06/19 04:01:25 checking revisions... 2020/06/19 04:01:25 testing simple program... syzkaller login: [ 59.036611][ T6802] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 04:01:25 building call list... [ 59.406261][ T25] tipc: TX() has been purged, node left! [ 59.898507][ T25] ================================================================== [ 59.906737][ T25] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 59.914623][ T25] Write of size 1 at addr ffff8880a006c1e4 by task kworker/u4:2/25 [ 59.922496][ T25] [ 59.924846][ T25] CPU: 0 PID: 25 Comm: kworker/u4:2 Not tainted 5.8.0-rc1-syzkaller #0 [ 59.933071][ T25] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.943124][ T25] Workqueue: netns cleanup_net [ 59.947903][ T25] Call Trace: [ 59.951192][ T25] dump_stack+0x18f/0x20d [ 59.955520][ T25] ? afs_wake_up_async_call+0x6aa/0x770 [ 59.961059][ T25] ? afs_wake_up_async_call+0x6aa/0x770 [ 59.966598][ T25] ? afs_put_call+0xa40/0xa40 [ 59.971279][ T25] print_address_description.constprop.0.cold+0xd3/0x413 [ 59.978320][ T25] ? vprintk_func+0x97/0x1a6 [ 59.982914][ T25] ? afs_wake_up_async_call+0x6aa/0x770 [ 59.988454][ T25] kasan_report.cold+0x1f/0x37 [ 59.993218][ T25] ? rcu_read_lock_held_common+0x51/0xa0 [ 59.998843][ T25] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.004389][ T25] afs_wake_up_async_call+0x6aa/0x770 [ 60.009754][ T25] ? afs_close_socket+0x320/0x320 [ 60.014774][ T25] ? afs_put_call+0xa40/0xa40 [ 60.019448][ T25] rxrpc_notify_socket+0x1db/0x5d0 [ 60.024560][ T25] ? afs_put_call+0xa40/0xa40 [ 60.029235][ T25] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 60.035648][ T25] rxrpc_call_completed+0xca/0xf0 [ 60.040672][ T25] rxrpc_discard_prealloc+0x781/0xab0 [ 60.046044][ T25] ? lock_sock_nested+0x94/0x110 [ 60.050995][ T25] rxrpc_listen+0x147/0x360 [ 60.055497][ T25] afs_close_socket+0x95/0x320 [ 60.060257][ T25] ? afs_purge_servers+0x16d/0x300 [ 60.065367][ T25] ? afs_rx_discard_new_call+0x50/0x50 [ 60.070830][ T25] ? init_wait_var_entry+0x200/0x200 [ 60.076115][ T25] ? rcu_read_lock_held_common+0xa0/0xa0 [ 60.081916][ T25] ? check_preemption_disabled+0x38/0x220 [ 60.087633][ T25] afs_net_exit+0x1bc/0x310 [ 60.092130][ T25] ? afs_net_init+0xe30/0xe30 [ 60.096805][ T25] ops_exit_list.isra.0+0xa8/0x150 [ 60.101915][ T25] cleanup_net+0x511/0xa50 [ 60.106331][ T25] ? unregister_pernet_device+0x70/0x70 [ 60.111879][ T25] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 60.117880][ T25] process_one_work+0x965/0x1690 [ 60.122829][ T25] ? lock_release+0x800/0x800 [ 60.127504][ T25] ? pwq_dec_nr_in_flight+0x310/0x310 [ 60.132977][ T25] ? rwlock_bug.part.0+0x90/0x90 [ 60.137922][ T25] worker_thread+0x96/0xe10 [ 60.142436][ T25] ? process_one_work+0x1690/0x1690 [ 60.147632][ T25] kthread+0x3b5/0x4a0 [ 60.151696][ T25] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 60.157409][ T25] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 60.163128][ T25] ret_from_fork+0x1f/0x30 [ 60.167551][ T25] [ 60.169869][ T25] Allocated by task 6802: [ 60.174194][ T25] save_stack+0x1b/0x40 [ 60.178343][ T25] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 60.183975][ T25] kmem_cache_alloc_trace+0x153/0x7d0 [ 60.189340][ T25] afs_alloc_call+0x55/0x630 [ 60.193924][ T25] afs_charge_preallocation+0xe9/0x2d0 [ 60.199376][ T25] afs_open_socket+0x292/0x360 [ 60.204130][ T25] afs_net_init+0xa6c/0xe30 [ 60.208625][ T25] ops_init+0xaf/0x420 [ 60.212702][ T25] setup_net+0x2de/0x860 [ 60.216937][ T25] copy_net_ns+0x293/0x590 [ 60.221346][ T25] create_new_namespaces+0x3fb/0xb30 [ 60.226629][ T25] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 60.232254][ T25] ksys_unshare+0x43d/0x8e0 [ 60.236752][ T25] __x64_sys_unshare+0x2d/0x40 [ 60.241507][ T25] do_syscall_64+0x60/0xe0 [ 60.245918][ T25] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 60.251795][ T25] [ 60.254116][ T25] Freed by task 25: [ 60.257921][ T25] save_stack+0x1b/0x40 [ 60.262072][ T25] __kasan_slab_free+0xf7/0x140 [ 60.266915][ T25] kfree+0x109/0x2b0 [ 60.270806][ T25] afs_put_call+0x585/0xa40 [ 60.275303][ T25] rxrpc_discard_prealloc+0x764/0xab0 [ 60.280671][ T25] rxrpc_listen+0x147/0x360 [ 60.285180][ T25] afs_close_socket+0x95/0x320 [ 60.289991][ T25] afs_net_exit+0x1bc/0x310 [ 60.294514][ T25] ops_exit_list.isra.0+0xa8/0x150 [ 60.299630][ T25] cleanup_net+0x511/0xa50 [ 60.304047][ T25] process_one_work+0x965/0x1690 [ 60.308977][ T25] worker_thread+0x96/0xe10 [ 60.313473][ T25] kthread+0x3b5/0x4a0 [ 60.317537][ T25] ret_from_fork+0x1f/0x30 [ 60.321938][ T25] [ 60.324260][ T25] The buggy address belongs to the object at ffff8880a006c000 [ 60.324260][ T25] which belongs to the cache kmalloc-1k of size 1024 [ 60.338306][ T25] The buggy address is located 484 bytes inside of [ 60.338306][ T25] 1024-byte region [ffff8880a006c000, ffff8880a006c400) [ 60.351661][ T25] The buggy address belongs to the page: [ 60.357305][ T25] page:ffffea0002801b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 60.366403][ T25] flags: 0xfffe0000000200(slab) [ 60.371248][ T25] raw: 00fffe0000000200 ffffea00029ab148 ffffea00023097c8 ffff8880aa000c40 [ 60.379848][ T25] raw: 0000000000000000 ffff8880a006c000 0000000100000002 0000000000000000 [ 60.388421][ T25] page dumped because: kasan: bad access detected [ 60.394821][ T25] [ 60.397144][ T25] Memory state around the buggy address: [ 60.402769][ T25] ffff8880a006c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.410828][ T25] ffff8880a006c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.418888][ T25] >ffff8880a006c180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.426954][ T25] ^ [ 60.434146][ T25] ffff8880a006c200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.442207][ T25] ffff8880a006c280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.450260][ T25] ================================================================== [ 60.458314][ T25] Disabling lock debugging due to kernel taint [ 60.464504][ T25] Kernel panic - not syncing: panic_on_warn set ... [ 60.471091][ T25] CPU: 0 PID: 25 Comm: kworker/u4:2 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 60.480705][ T25] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.490760][ T25] Workqueue: netns cleanup_net [ 60.495562][ T25] Call Trace: [ 60.498860][ T25] dump_stack+0x18f/0x20d [ 60.503195][ T25] ? afs_wake_up_async_call+0x670/0x770 [ 60.508738][ T25] ? afs_put_call+0xa40/0xa40 [ 60.513410][ T25] panic+0x2e3/0x75c [ 60.517330][ T25] ? __warn_printk+0xf3/0xf3 [ 60.521917][ T25] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 60.528069][ T25] ? trace_hardirqs_on+0x55/0x220 [ 60.533089][ T25] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.538628][ T25] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.544165][ T25] ? afs_put_call+0xa40/0xa40 [ 60.548840][ T25] end_report+0x4d/0x53 [ 60.552993][ T25] kasan_report.cold+0xd/0x37 [ 60.557669][ T25] ? rcu_read_lock_held_common+0x51/0xa0 [ 60.563303][ T25] ? afs_wake_up_async_call+0x6aa/0x770 [ 60.568844][ T25] afs_wake_up_async_call+0x6aa/0x770 [ 60.574209][ T25] ? afs_close_socket+0x320/0x320 [ 60.579231][ T25] ? afs_put_call+0xa40/0xa40 [ 60.583905][ T25] rxrpc_notify_socket+0x1db/0x5d0 [ 60.589012][ T25] ? afs_put_call+0xa40/0xa40 [ 60.593683][ T25] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 60.600137][ T25] rxrpc_call_completed+0xca/0xf0 [ 60.605162][ T25] rxrpc_discard_prealloc+0x781/0xab0 [ 60.610534][ T25] ? lock_sock_nested+0x94/0x110 [ 60.615470][ T25] rxrpc_listen+0x147/0x360 [ 60.619970][ T25] afs_close_socket+0x95/0x320 [ 60.624732][ T25] ? afs_purge_servers+0x16d/0x300 [ 60.629844][ T25] ? afs_rx_discard_new_call+0x50/0x50 [ 60.635389][ T25] ? init_wait_var_entry+0x200/0x200 [ 60.640684][ T25] ? rcu_read_lock_held_common+0xa0/0xa0 [ 60.646341][ T25] ? check_preemption_disabled+0x38/0x220 [ 60.652066][ T25] afs_net_exit+0x1bc/0x310 [ 60.656569][ T25] ? afs_net_init+0xe30/0xe30 [ 60.661243][ T25] ops_exit_list.isra.0+0xa8/0x150 [ 60.666355][ T25] cleanup_net+0x511/0xa50 [ 60.670770][ T25] ? unregister_pernet_device+0x70/0x70 [ 60.676317][ T25] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 60.682310][ T25] process_one_work+0x965/0x1690 [ 60.687250][ T25] ? lock_release+0x800/0x800 [ 60.691955][ T25] ? pwq_dec_nr_in_flight+0x310/0x310 [ 60.697329][ T25] ? rwlock_bug.part.0+0x90/0x90 [ 60.702271][ T25] worker_thread+0x96/0xe10 [ 60.706781][ T25] ? process_one_work+0x1690/0x1690 [ 60.711976][ T25] kthread+0x3b5/0x4a0 [ 60.716046][ T25] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 60.721763][ T25] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 60.727489][ T25] ret_from_fork+0x1f/0x30 [ 60.733181][ T25] Kernel Offset: disabled [ 60.737504][ T25] Rebooting in 86400 seconds..