Warning: Permanently added '[localhost]:16044' (ECDSA) to the list of known hosts. 2020/06/26 01:19:44 fuzzer started 2020/06/26 01:19:45 connecting to host at 10.0.2.10:44925 2020/06/26 01:19:45 checking machine... 2020/06/26 01:19:45 checking revisions... 2020/06/26 01:19:45 testing simple program... syzkaller login: [ 145.388720][ T8319] IPVS: ftp: loaded support on port[0] = 21 2020/06/26 01:19:46 building call list... [ 146.114779][ T8] tipc: TX() has been purged, node left! [ 147.000105][ T8] ================================================================== [ 147.003973][ T8] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 147.003973][ T8] Write of size 1 at addr ffff88801b49d9e4 by task kworker/u16:0/8 [ 147.003973][ T8] [ 147.003973][ T8] CPU: 3 PID: 8 Comm: kworker/u16:0 Not tainted 5.8.0-rc2-syzkaller #0 [ 147.003973][ T8] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [ 147.003973][ T8] Workqueue: netns cleanup_net [ 147.003973][ T8] Call Trace: [ 147.003973][ T8] dump_stack+0x18f/0x20d [ 147.003973][ T8] ? afs_wake_up_async_call+0x6aa/0x770 [ 147.003973][ T8] ? afs_wake_up_async_call+0x6aa/0x770 [ 147.003973][ T8] ? afs_put_call+0xa40/0xa40 [ 147.003973][ T8] print_address_description.constprop.0.cold+0xd3/0x413 [ 147.003973][ T8] ? vprintk_func+0x97/0x1a6 [ 147.003973][ T8] ? afs_wake_up_async_call+0x6aa/0x770 [ 147.003973][ T8] kasan_report.cold+0x1f/0x37 [ 147.003973][ T8] ? rcu_read_lock_held_common+0x91/0xa0 [ 147.003973][ T8] ? afs_wake_up_async_call+0x6aa/0x770 [ 147.003973][ T8] afs_wake_up_async_call+0x6aa/0x770 [ 147.003973][ T8] ? afs_close_socket+0x320/0x320 [ 147.003973][ T8] ? afs_put_call+0xa40/0xa40 [ 147.003973][ T8] rxrpc_notify_socket+0x1db/0x5d0 [ 147.003973][ T8] ? afs_put_call+0xa40/0xa40 [ 147.003973][ T8] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 147.003973][ T8] rxrpc_call_completed+0xca/0xf0 [ 147.003973][ T8] rxrpc_discard_prealloc+0x781/0xab0 [ 147.003973][ T8] ? lock_sock_nested+0x94/0x110 [ 147.285668][ T8] rxrpc_listen+0x147/0x360 [ 147.294427][ T8] afs_close_socket+0x95/0x320 [ 147.294427][ T8] ? afs_purge_servers+0x181/0x330 [ 147.294427][ T8] ? afs_rx_discard_new_call+0x50/0x50 [ 147.294427][ T8] ? init_wait_var_entry+0x200/0x200 [ 147.294427][ T8] afs_net_exit+0x1c4/0x310 [ 147.294427][ T8] ? afs_net_init+0xe90/0xe90 [ 147.294427][ T8] ops_exit_list.isra.0+0xa8/0x150 [ 147.294427][ T8] cleanup_net+0x511/0xa50 [ 147.294427][ T8] ? unregister_pernet_device+0x70/0x70 [ 147.294427][ T8] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 147.294427][ T8] process_one_work+0x965/0x1690 [ 147.294427][ T8] ? lock_release+0x800/0x800 [ 147.294427][ T8] ? pwq_dec_nr_in_flight+0x310/0x310 [ 147.294427][ T8] ? rwlock_bug.part.0+0x90/0x90 [ 147.294427][ T8] worker_thread+0x96/0xe10 [ 147.294427][ T8] ? process_one_work+0x1690/0x1690 [ 147.294427][ T8] kthread+0x3b5/0x4a0 [ 147.294427][ T8] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 147.294427][ T8] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 147.294427][ T8] ret_from_fork+0x1f/0x30 [ 147.294427][ T8] [ 147.294427][ T8] Allocated by task 8319: [ 147.294427][ T8] save_stack+0x1b/0x40 [ 147.294427][ T8] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 147.294427][ T8] kmem_cache_alloc_trace+0x153/0x7d0 [ 147.294427][ T8] afs_alloc_call+0x55/0x630 [ 147.294427][ T8] afs_charge_preallocation+0xe9/0x2d0 [ 147.294427][ T8] afs_open_socket+0x292/0x360 [ 147.294427][ T8] afs_net_init+0xab4/0xe90 [ 147.294427][ T8] ops_init+0xaf/0x420 [ 147.294427][ T8] setup_net+0x2de/0x860 [ 147.294427][ T8] copy_net_ns+0x293/0x590 [ 147.294427][ T8] create_new_namespaces+0x3fb/0xb30 [ 147.294427][ T8] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 147.294427][ T8] ksys_unshare+0x43d/0x8e0 [ 147.294427][ T8] __ia32_sys_unshare+0x2c/0x40 [ 147.294427][ T8] do_syscall_32_irqs_on+0x3f/0x60 [ 147.294427][ T8] do_fast_syscall_32+0x7f/0x120 [ 147.294427][ T8] entry_SYSENTER_compat+0x6d/0x7c [ 147.294427][ T8] [ 147.294427][ T8] Freed by task 8: [ 147.294427][ T8] save_stack+0x1b/0x40 [ 147.294427][ T8] __kasan_slab_free+0xf7/0x140 [ 147.294427][ T8] kfree+0x109/0x2b0 [ 147.294427][ T8] afs_put_call+0x585/0xa40 [ 147.294427][ T8] rxrpc_discard_prealloc+0x764/0xab0 [ 147.294427][ T8] rxrpc_listen+0x147/0x360 [ 147.294427][ T8] afs_close_socket+0x95/0x320 [ 147.294427][ T8] afs_net_exit+0x1c4/0x310 [ 147.294427][ T8] ops_exit_list.isra.0+0xa8/0x150 [ 147.294427][ T8] cleanup_net+0x511/0xa50 [ 147.294427][ T8] process_one_work+0x965/0x1690 [ 147.294427][ T8] worker_thread+0x96/0xe10 [ 147.294427][ T8] kthread+0x3b5/0x4a0 [ 147.294427][ T8] ret_from_fork+0x1f/0x30 [ 147.294427][ T8] [ 147.294427][ T8] The buggy address belongs to the object at ffff88801b49d800 [ 147.294427][ T8] which belongs to the cache kmalloc-1k of size 1024 [ 147.294427][ T8] The buggy address is located 484 bytes inside of [ 147.294427][ T8] 1024-byte region [ffff88801b49d800, ffff88801b49dc00) [ 147.294427][ T8] The buggy address belongs to the page: [ 147.294427][ T8] page:ffffea00006d2740 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 147.294427][ T8] flags: 0xfffe0000000200(slab) [ 147.294427][ T8] raw: 00fffe0000000200 ffffea000083a848 ffffea00007cc408 ffff88802c800c40 [ 147.294427][ T8] raw: 0000000000000000 ffff88801b49d000 0000000100000002 0000000000000000 [ 147.294427][ T8] page dumped because: kasan: bad access detected [ 147.294427][ T8] [ 147.294427][ T8] Memory state around the buggy address: [ 147.294427][ T8] ffff88801b49d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 147.294427][ T8] ffff88801b49d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 147.294427][ T8] >ffff88801b49d980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 147.294427][ T8] ^ [ 147.294427][ T8] ffff88801b49da00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 147.294427][ T8] ffff88801b49da80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 147.294427][ T8] ================================================================== [ 147.294427][ T8] Disabling lock debugging due to kernel taint [ 148.443698][ T8] Kernel panic - not syncing: panic_on_warn set ... [ 148.451106][ T8] CPU: 3 PID: 8 Comm: kworker/u16:0 Tainted: G B 5.8.0-rc2-syzkaller #0 [ 148.451106][ T8] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [ 148.451106][ T8] Workqueue: netns cleanup_net [ 148.451106][ T8] Call Trace: [ 148.451106][ T8] dump_stack+0x18f/0x20d [ 148.451106][ T8] ? afs_wake_up_async_call+0x650/0x770 [ 148.451106][ T8] ? afs_put_call+0xa40/0xa40 [ 148.451106][ T8] panic+0x2e3/0x75c [ 148.451106][ T8] ? __warn_printk+0xf3/0xf3 [ 148.451106][ T8] ? asm_common_interrupt+0x1e/0x40 [ 148.451106][ T8] ? trace_hardirqs_on+0x55/0x220 [ 148.451106][ T8] ? afs_wake_up_async_call+0x6aa/0x770 [ 148.451106][ T8] ? afs_wake_up_async_call+0x6aa/0x770 [ 148.451106][ T8] ? afs_put_call+0xa40/0xa40 [ 148.451106][ T8] end_report+0x4d/0x53 [ 148.451106][ T8] kasan_report.cold+0xd/0x37 [ 148.451106][ T8] ? rcu_read_lock_held_common+0x91/0xa0 [ 148.451106][ T8] ? afs_wake_up_async_call+0x6aa/0x770 [ 148.451106][ T8] afs_wake_up_async_call+0x6aa/0x770 [ 148.451106][ T8] ? afs_close_socket+0x320/0x320 [ 148.451106][ T8] ? afs_put_call+0xa40/0xa40 [ 148.451106][ T8] rxrpc_notify_socket+0x1db/0x5d0 [ 148.451106][ T8] ? afs_put_call+0xa40/0xa40 [ 148.451106][ T8] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 148.451106][ T8] rxrpc_call_completed+0xca/0xf0 [ 148.451106][ T8] rxrpc_discard_prealloc+0x781/0xab0 [ 148.451106][ T8] ? lock_sock_nested+0x94/0x110 [ 148.451106][ T8] rxrpc_listen+0x147/0x360 [ 148.451106][ T8] afs_close_socket+0x95/0x320 [ 148.451106][ T8] ? afs_purge_servers+0x181/0x330 [ 148.451106][ T8] ? afs_rx_discard_new_call+0x50/0x50 [ 148.451106][ T8] ? init_wait_var_entry+0x200/0x200 [ 148.451106][ T8] afs_net_exit+0x1c4/0x310 [ 148.451106][ T8] ? afs_net_init+0xe90/0xe90 [ 148.451106][ T8] ops_exit_list.isra.0+0xa8/0x150 [ 148.451106][ T8] cleanup_net+0x511/0xa50 [ 148.451106][ T8] ? unregister_pernet_device+0x70/0x70 [ 148.451106][ T8] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 148.451106][ T8] process_one_work+0x965/0x1690 [ 148.451106][ T8] ? lock_release+0x800/0x800 [ 148.451106][ T8] ? pwq_dec_nr_in_flight+0x310/0x310 [ 148.451106][ T8] ? rwlock_bug.part.0+0x90/0x90 [ 148.451106][ T8] worker_thread+0x96/0xe10 [ 148.451106][ T8] ? process_one_work+0x1690/0x1690 [ 148.451106][ T8] kthread+0x3b5/0x4a0 [ 148.451106][ T8] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 148.451106][ T8] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 148.451106][ T8] ret_from_fork+0x1f/0x30 [ 148.451106][ T8] Kernel Offset: disabled [ 148.451106][ T8] Rebooting in 86400 seconds..