Warning: Permanently added '10.128.10.47' (ECDSA) to the list of known hosts. 2020/06/19 04:16:06 fuzzer started 2020/06/19 04:16:06 connecting to host at 10.128.0.26:39193 2020/06/19 04:16:06 checking machine... 2020/06/19 04:16:06 checking revisions... 2020/06/19 04:16:06 testing simple program... syzkaller login: [ 60.148971][ T6806] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 04:16:06 building call list... [ 60.462740][ T26] tipc: TX() has been purged, node left! [ 60.984752][ T26] ================================================================== [ 60.993026][ T26] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 61.001003][ T26] Write of size 1 at addr ffff88809a0019e4 by task kworker/u4:2/26 [ 61.008907][ T26] [ 61.011242][ T26] CPU: 0 PID: 26 Comm: kworker/u4:2 Not tainted 5.8.0-rc1-syzkaller #0 [ 61.019646][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.029704][ T26] Workqueue: netns cleanup_net [ 61.034471][ T26] Call Trace: [ 61.037784][ T26] dump_stack+0x18f/0x20d [ 61.042114][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.047658][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.053219][ T26] ? afs_put_call+0xa40/0xa40 [ 61.057899][ T26] print_address_description.constprop.0.cold+0xd3/0x413 [ 61.064926][ T26] ? vprintk_func+0x97/0x1a6 [ 61.069525][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.075065][ T26] kasan_report.cold+0x1f/0x37 [ 61.080548][ T26] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.086284][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.091829][ T26] afs_wake_up_async_call+0x6aa/0x770 [ 61.097196][ T26] ? afs_close_socket+0x320/0x320 [ 61.102223][ T26] ? afs_put_call+0xa40/0xa40 [ 61.106902][ T26] rxrpc_notify_socket+0x1db/0x5d0 [ 61.112017][ T26] ? afs_put_call+0xa40/0xa40 [ 61.116692][ T26] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.123540][ T26] rxrpc_call_completed+0xca/0xf0 [ 61.128567][ T26] rxrpc_discard_prealloc+0x781/0xab0 [ 61.133941][ T26] ? lock_sock_nested+0x94/0x110 [ 61.138897][ T26] rxrpc_listen+0x147/0x360 [ 61.143663][ T26] afs_close_socket+0x95/0x320 [ 61.149146][ T26] ? afs_purge_servers+0x16d/0x300 [ 61.154542][ T26] ? afs_rx_discard_new_call+0x50/0x50 [ 61.160104][ T26] ? init_wait_var_entry+0x200/0x200 [ 61.165406][ T26] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.171248][ T26] ? check_preemption_disabled+0x38/0x220 [ 61.177073][ T26] afs_net_exit+0x1bc/0x310 [ 61.181772][ T26] ? afs_net_init+0xe30/0xe30 [ 61.186534][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 61.191880][ T26] cleanup_net+0x511/0xa50 [ 61.196339][ T26] ? unregister_pernet_device+0x70/0x70 [ 61.202270][ T26] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.208361][ T26] process_one_work+0x965/0x1690 [ 61.214467][ T26] ? lock_release+0x800/0x800 [ 61.219147][ T26] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.224524][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 61.231492][ T26] worker_thread+0x96/0xe10 [ 61.236010][ T26] ? process_one_work+0x1690/0x1690 [ 61.241505][ T26] kthread+0x3b5/0x4a0 [ 61.245883][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.251771][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.257521][ T26] ret_from_fork+0x1f/0x30 [ 61.261965][ T26] [ 61.264287][ T26] Allocated by task 6806: [ 61.268640][ T26] save_stack+0x1b/0x40 [ 61.272915][ T26] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 61.278545][ T26] kmem_cache_alloc_trace+0x153/0x7d0 [ 61.284092][ T26] afs_alloc_call+0x55/0x630 [ 61.288697][ T26] afs_charge_preallocation+0xe9/0x2d0 [ 61.294341][ T26] afs_open_socket+0x292/0x360 [ 61.299230][ T26] afs_net_init+0xa6c/0xe30 [ 61.303735][ T26] ops_init+0xaf/0x420 [ 61.307800][ T26] setup_net+0x2de/0x860 [ 61.312037][ T26] copy_net_ns+0x293/0x590 [ 61.316448][ T26] create_new_namespaces+0x3fb/0xb30 [ 61.321814][ T26] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 61.327440][ T26] ksys_unshare+0x43d/0x8e0 [ 61.331961][ T26] __x64_sys_unshare+0x2d/0x40 [ 61.337064][ T26] do_syscall_64+0x60/0xe0 [ 61.341479][ T26] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.347362][ T26] [ 61.349695][ T26] Freed by task 26: [ 61.353501][ T26] save_stack+0x1b/0x40 [ 61.357654][ T26] __kasan_slab_free+0xf7/0x140 [ 61.362516][ T26] kfree+0x109/0x2b0 [ 61.366409][ T26] afs_put_call+0x585/0xa40 [ 61.370908][ T26] rxrpc_discard_prealloc+0x764/0xab0 [ 61.376297][ T26] rxrpc_listen+0x147/0x360 [ 61.380818][ T26] afs_close_socket+0x95/0x320 [ 61.385600][ T26] afs_net_exit+0x1bc/0x310 [ 61.391750][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 61.396858][ T26] cleanup_net+0x511/0xa50 [ 61.401287][ T26] process_one_work+0x965/0x1690 [ 61.406276][ T26] worker_thread+0x96/0xe10 [ 61.410929][ T26] kthread+0x3b5/0x4a0 [ 61.415014][ T26] ret_from_fork+0x1f/0x30 [ 61.419617][ T26] [ 61.421941][ T26] The buggy address belongs to the object at ffff88809a001800 [ 61.421941][ T26] which belongs to the cache kmalloc-1k of size 1024 [ 61.437056][ T26] The buggy address is located 484 bytes inside of [ 61.437056][ T26] 1024-byte region [ffff88809a001800, ffff88809a001c00) [ 61.450403][ T26] The buggy address belongs to the page: [ 61.456049][ T26] page:ffffea0002680040 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88809a001000 [ 61.466459][ T26] flags: 0xfffe0000000200(slab) [ 61.471319][ T26] raw: 00fffe0000000200 ffffea0002a1b188 ffffea000299d4c8 ffff8880aa000c40 [ 61.479905][ T26] raw: ffff88809a001000 ffff88809a001000 0000000100000001 0000000000000000 [ 61.488478][ T26] page dumped because: kasan: bad access detected [ 61.494890][ T26] [ 61.497218][ T26] Memory state around the buggy address: [ 61.503137][ T26] ffff88809a001880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.511202][ T26] ffff88809a001900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.519289][ T26] >ffff88809a001980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.527426][ T26] ^ [ 61.534613][ T26] ffff88809a001a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.542673][ T26] ffff88809a001a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.550816][ T26] ================================================================== [ 61.558875][ T26] Disabling lock debugging due to kernel taint [ 61.565078][ T26] Kernel panic - not syncing: panic_on_warn set ... [ 61.571662][ T26] CPU: 0 PID: 26 Comm: kworker/u4:2 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 61.581364][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.591425][ T26] Workqueue: netns cleanup_net [ 61.596181][ T26] Call Trace: [ 61.599477][ T26] dump_stack+0x18f/0x20d [ 61.603810][ T26] ? afs_wake_up_async_call+0x680/0x770 [ 61.609354][ T26] ? afs_put_call+0xa40/0xa40 [ 61.614028][ T26] panic+0x2e3/0x75c [ 61.617926][ T26] ? __warn_printk+0xf3/0xf3 [ 61.622657][ T26] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 61.628831][ T26] ? trace_hardirqs_on+0x55/0x220 [ 61.634288][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.639841][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.645371][ T26] ? afs_put_call+0xa40/0xa40 [ 61.650044][ T26] end_report+0x4d/0x53 [ 61.654194][ T26] kasan_report.cold+0xd/0x37 [ 61.658875][ T26] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.664494][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.670197][ T26] afs_wake_up_async_call+0x6aa/0x770 [ 61.675592][ T26] ? afs_close_socket+0x320/0x320 [ 61.680722][ T26] ? afs_put_call+0xa40/0xa40 [ 61.685480][ T26] rxrpc_notify_socket+0x1db/0x5d0 [ 61.690592][ T26] ? afs_put_call+0xa40/0xa40 [ 61.695267][ T26] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.701681][ T26] rxrpc_call_completed+0xca/0xf0 [ 61.706733][ T26] rxrpc_discard_prealloc+0x781/0xab0 [ 61.712113][ T26] ? lock_sock_nested+0x94/0x110 [ 61.717049][ T26] rxrpc_listen+0x147/0x360 [ 61.721555][ T26] afs_close_socket+0x95/0x320 [ 61.726308][ T26] ? afs_purge_servers+0x16d/0x300 [ 61.731457][ T26] ? afs_rx_discard_new_call+0x50/0x50 [ 61.736919][ T26] ? init_wait_var_entry+0x200/0x200 [ 61.742670][ T26] ? rcu_read_lock_held_common+0xa0/0xa0 [ 61.748375][ T26] ? check_preemption_disabled+0x38/0x220 [ 61.754087][ T26] afs_net_exit+0x1bc/0x310 [ 61.758574][ T26] ? afs_net_init+0xe30/0xe30 [ 61.763234][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 61.768327][ T26] cleanup_net+0x511/0xa50 [ 61.772732][ T26] ? unregister_pernet_device+0x70/0x70 [ 61.778287][ T26] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.784377][ T26] process_one_work+0x965/0x1690 [ 61.789346][ T26] ? lock_release+0x800/0x800 [ 61.794028][ T26] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.800194][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 61.805231][ T26] worker_thread+0x96/0xe10 [ 61.809776][ T26] ? process_one_work+0x1690/0x1690 [ 61.814961][ T26] kthread+0x3b5/0x4a0 [ 61.819027][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.824747][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.830456][ T26] ret_from_fork+0x1f/0x30 [ 61.836342][ T26] Kernel Offset: disabled [ 61.840689][ T26] Rebooting in 86400 seconds..