Warning: Permanently added '[localhost]:54361' (ECDSA) to the list of known hosts. 2020/06/26 00:00:15 fuzzer started 2020/06/26 00:00:16 connecting to host at 10.0.2.10:35425 2020/06/26 00:00:16 checking machine... 2020/06/26 00:00:16 checking revisions... 2020/06/26 00:00:16 testing simple program... syzkaller login: [ 149.091672][ T9259] IPVS: ftp: loaded support on port[0] = 21 2020/06/26 00:00:18 building call list... [ 149.785683][ T8] tipc: TX() has been purged, node left! executing program [ 150.663281][ T8] ================================================================== [ 150.663922][ T8] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 150.663922][ T8] Write of size 1 at addr ffff888028b751e4 by task kworker/u16:0/8 [ 150.663922][ T8] [ 150.663922][ T8] CPU: 3 PID: 8 Comm: kworker/u16:0 Not tainted 5.8.0-rc2-syzkaller #0 [ 150.794163][ T8] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [ 150.794163][ T8] Workqueue: netns cleanup_net [ 150.794163][ T8] Call Trace: [ 150.794163][ T8] dump_stack+0x18f/0x20d [ 150.794163][ T8] ? afs_wake_up_async_call+0x6aa/0x770 [ 150.794163][ T8] ? afs_wake_up_async_call+0x6aa/0x770 [ 150.794163][ T8] ? afs_put_call+0xa40/0xa40 [ 150.794163][ T8] print_address_description.constprop.0.cold+0xd3/0x413 [ 150.794163][ T8] ? vprintk_func+0x97/0x1a6 [ 150.794163][ T8] ? afs_wake_up_async_call+0x6aa/0x770 [ 150.794163][ T8] kasan_report.cold+0x1f/0x37 [ 150.794163][ T8] ? rcu_read_lock_held_common+0x91/0xa0 [ 150.794163][ T8] ? afs_wake_up_async_call+0x6aa/0x770 [ 150.794163][ T8] afs_wake_up_async_call+0x6aa/0x770 [ 150.794163][ T8] ? afs_close_socket+0x320/0x320 [ 150.794163][ T8] ? afs_put_call+0xa40/0xa40 [ 150.994466][ T8] rxrpc_notify_socket+0x1db/0x5d0 [ 150.994466][ T8] ? afs_put_call+0xa40/0xa40 [ 150.994466][ T8] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 150.994466][ T8] rxrpc_call_completed+0xca/0xf0 [ 150.994466][ T8] rxrpc_discard_prealloc+0x781/0xab0 [ 150.994466][ T8] ? lock_sock_nested+0x94/0x110 [ 150.994466][ T8] rxrpc_listen+0x147/0x360 [ 150.994466][ T8] afs_close_socket+0x95/0x320 [ 150.994466][ T8] ? afs_purge_servers+0x181/0x330 [ 150.994466][ T8] ? afs_rx_discard_new_call+0x50/0x50 [ 150.994466][ T8] ? init_wait_var_entry+0x200/0x200 [ 150.994466][ T8] afs_net_exit+0x1c4/0x310 [ 150.994466][ T8] ? afs_net_init+0xe90/0xe90 [ 150.994466][ T8] ops_exit_list.isra.0+0xa8/0x150 [ 150.994466][ T8] cleanup_net+0x511/0xa50 [ 150.994466][ T8] ? unregister_pernet_device+0x70/0x70 [ 150.994466][ T8] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 150.994466][ T8] process_one_work+0x965/0x1690 [ 150.994466][ T8] ? lock_release+0x800/0x800 [ 150.994466][ T8] ? pwq_dec_nr_in_flight+0x310/0x310 [ 150.994466][ T8] ? rwlock_bug.part.0+0x90/0x90 [ 150.994466][ T8] worker_thread+0x96/0xe10 [ 150.994466][ T8] ? process_one_work+0x1690/0x1690 [ 150.994466][ T8] kthread+0x3b5/0x4a0 [ 150.994466][ T8] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 150.994466][ T8] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 150.994466][ T8] ret_from_fork+0x1f/0x30 [ 150.994466][ T8] [ 150.994466][ T8] Allocated by task 9259: [ 150.994466][ T8] save_stack+0x1b/0x40 [ 150.994466][ T8] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 150.994466][ T8] kmem_cache_alloc_trace+0x153/0x7d0 [ 150.994466][ T8] afs_alloc_call+0x55/0x630 [ 150.994466][ T8] afs_charge_preallocation+0xe9/0x2d0 [ 150.994466][ T8] afs_open_socket+0x292/0x360 [ 150.994466][ T8] afs_net_init+0xab4/0xe90 [ 150.994466][ T8] ops_init+0xaf/0x420 [ 150.994466][ T8] setup_net+0x2de/0x860 [ 150.994466][ T8] copy_net_ns+0x293/0x590 [ 150.994466][ T8] create_new_namespaces+0x3fb/0xb30 [ 150.994466][ T8] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 150.994466][ T8] ksys_unshare+0x43d/0x8e0 [ 150.994466][ T8] __ia32_sys_unshare+0x2c/0x40 [ 150.994466][ T8] do_syscall_32_irqs_on+0x3f/0x60 [ 150.994466][ T8] do_fast_syscall_32+0x7f/0x120 [ 150.994466][ T8] entry_SYSENTER_compat+0x6d/0x7c [ 150.994466][ T8] [ 150.994466][ T8] Freed by task 8: [ 150.994466][ T8] save_stack+0x1b/0x40 [ 150.994466][ T8] __kasan_slab_free+0xf7/0x140 [ 150.994466][ T8] kfree+0x109/0x2b0 [ 150.994466][ T8] afs_put_call+0x585/0xa40 [ 150.994466][ T8] rxrpc_discard_prealloc+0x764/0xab0 [ 150.994466][ T8] rxrpc_listen+0x147/0x360 [ 150.994466][ T8] afs_close_socket+0x95/0x320 [ 150.994466][ T8] afs_net_exit+0x1c4/0x310 [ 150.994466][ T8] ops_exit_list.isra.0+0xa8/0x150 [ 150.994466][ T8] cleanup_net+0x511/0xa50 [ 150.994466][ T8] process_one_work+0x965/0x1690 [ 150.994466][ T8] worker_thread+0x96/0xe10 [ 150.994466][ T8] kthread+0x3b5/0x4a0 [ 150.994466][ T8] ret_from_fork+0x1f/0x30 [ 150.994466][ T8] [ 150.994466][ T8] The buggy address belongs to the object at ffff888028b75000 [ 150.994466][ T8] which belongs to the cache kmalloc-1k of size 1024 [ 150.994466][ T8] The buggy address is located 484 bytes inside of [ 150.994466][ T8] 1024-byte region [ffff888028b75000, ffff888028b75400) [ 150.994466][ T8] The buggy address belongs to the page: [ 150.994466][ T8] page:ffffea0000a2dd40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 150.994466][ T8] flags: 0xfffe0000000200(slab) [ 150.994466][ T8] raw: 00fffe0000000200 ffffea00009cbe08 ffffea0000a6d888 ffff88802c800c40 [ 150.994466][ T8] raw: 0000000000000000 ffff888028b75000 0000000100000002 0000000000000000 [ 150.994466][ T8] page dumped because: kasan: bad access detected [ 150.994466][ T8] [ 150.994466][ T8] Memory state around the buggy address: [ 150.994466][ T8] ffff888028b75080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 150.994466][ T8] ffff888028b75100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 150.994466][ T8] >ffff888028b75180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 150.994466][ T8] ^ [ 150.994466][ T8] ffff888028b75200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 150.994466][ T8] ffff888028b75280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 150.994466][ T8] ================================================================== [ 150.994466][ T8] Disabling lock debugging due to kernel taint [ 152.089204][ T8] Kernel panic - not syncing: panic_on_warn set ... [ 152.104086][ T8] CPU: 3 PID: 8 Comm: kworker/u16:0 Tainted: G B 5.8.0-rc2-syzkaller #0 [ 152.134089][ T8] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [ 152.184218][ T8] Workqueue: netns cleanup_net [ 152.184218][ T8] Call Trace: [ 152.214098][ T8] dump_stack+0x18f/0x20d [ 152.214098][ T8] ? afs_wake_up_async_call+0x650/0x770 [ 152.244189][ T8] ? afs_put_call+0xa40/0xa40 [ 152.244189][ T8] panic+0x2e3/0x75c [ 152.274108][ T8] ? __warn_printk+0xf3/0xf3 [ 152.284087][ T8] ? asm_common_interrupt+0x1e/0x40 [ 152.304313][ T8] ? trace_hardirqs_on+0x55/0x220 [ 152.324093][ T8] ? afs_wake_up_async_call+0x6aa/0x770 [ 152.344228][ T8] ? afs_wake_up_async_call+0x6aa/0x770 [ 152.364326][ T8] ? afs_put_call+0xa40/0xa40 [ 152.384213][ T8] end_report+0x4d/0x53 [ 152.384213][ T8] kasan_report.cold+0xd/0x37 [ 152.414199][ T8] ? rcu_read_lock_held_common+0x91/0xa0 [ 152.444072][ T8] ? afs_wake_up_async_call+0x6aa/0x770 [ 152.444072][ T8] afs_wake_up_async_call+0x6aa/0x770 [ 152.474102][ T8] ? afs_close_socket+0x320/0x320 [ 152.474102][ T8] ? afs_put_call+0xa40/0xa40 [ 152.494145][ T8] rxrpc_notify_socket+0x1db/0x5d0 [ 152.504179][ T8] ? afs_put_call+0xa40/0xa40 [ 152.504179][ T8] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 152.534049][ T8] rxrpc_call_completed+0xca/0xf0 [ 152.544003][ T8] rxrpc_discard_prealloc+0x781/0xab0 [ 152.544003][ T8] ? lock_sock_nested+0x94/0x110 [ 152.584096][ T8] rxrpc_listen+0x147/0x360 [ 152.594130][ T8] afs_close_socket+0x95/0x320 [ 152.594130][ T8] ? afs_purge_servers+0x181/0x330 [ 152.614009][ T8] ? afs_rx_discard_new_call+0x50/0x50 [ 152.634139][ T8] ? init_wait_var_entry+0x200/0x200 [ 152.644114][ T8] afs_net_exit+0x1c4/0x310 [ 152.664020][ T8] ? afs_net_init+0xe90/0xe90 [ 152.664020][ T8] ops_exit_list.isra.0+0xa8/0x150 [ 152.684135][ T8] cleanup_net+0x511/0xa50 [ 152.714177][ T8] ? unregister_pernet_device+0x70/0x70 [ 152.724297][ T8] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 152.744000][ T8] process_one_work+0x965/0x1690 [ 152.764164][ T8] ? lock_release+0x800/0x800 [ 152.764164][ T8] ? pwq_dec_nr_in_flight+0x310/0x310 [ 152.764164][ T8] ? rwlock_bug.part.0+0x90/0x90 [ 152.794033][ T8] worker_thread+0x96/0xe10 [ 152.794033][ T8] ? process_one_work+0x1690/0x1690 [ 152.814054][ T8] kthread+0x3b5/0x4a0 [ 152.814054][ T8] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 152.833973][ T8] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 152.854099][ T8] ret_from_fork+0x1f/0x30 [ 152.875134][ T8] Kernel Offset: disabled [ 152.875134][ T8] Rebooting in 86400 seconds..