Warning: Permanently added '[localhost]:36527' (ECDSA) to the list of known hosts. 2020/06/25 01:35:51 fuzzer started 2020/06/25 01:35:53 connecting to host at 10.0.2.10:34453 2020/06/25 01:35:53 checking machine... 2020/06/25 01:35:53 checking revisions... 2020/06/25 01:35:54 testing simple program... syzkaller login: [ 207.873093][ T9401] IPVS: ftp: loaded support on port[0] = 21 executing program 2020/06/25 01:35:56 building call list... [ 208.882251][ T1812] tipc: TX() has been purged, node left! [ 209.684767][ T1812] ================================================================== [ 209.691745][ T1812] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 209.691745][ T1812] Write of size 1 at addr ffff888029dfb1e4 by task kworker/u16:1/1812 [ 209.691745][ T1812] [ 209.691745][ T1812] CPU: 2 PID: 1812 Comm: kworker/u16:1 Not tainted 5.8.0-rc2-syzkaller #0 [ 209.691745][ T1812] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [ 209.691745][ T1812] Workqueue: netns cleanup_net [ 209.691745][ T1812] Call Trace: [ 209.691745][ T1812] dump_stack+0x18f/0x20d [ 209.691745][ T1812] ? afs_wake_up_async_call+0x6aa/0x770 [ 209.691745][ T1812] ? afs_wake_up_async_call+0x6aa/0x770 [ 209.691745][ T1812] ? afs_put_call+0xa40/0xa40 [ 209.691745][ T1812] print_address_description.constprop.0.cold+0xd3/0x413 [ 209.691745][ T1812] ? vprintk_func+0x97/0x1a6 [ 209.691745][ T1812] ? afs_wake_up_async_call+0x6aa/0x770 [ 209.691745][ T1812] kasan_report.cold+0x1f/0x37 [ 209.691745][ T1812] ? rcu_read_lock_held_common+0x91/0xa0 [ 209.691745][ T1812] ? afs_wake_up_async_call+0x6aa/0x770 [ 209.691745][ T1812] afs_wake_up_async_call+0x6aa/0x770 [ 209.691745][ T1812] ? afs_close_socket+0x320/0x320 [ 209.691745][ T1812] ? afs_put_call+0xa40/0xa40 [ 209.691745][ T1812] rxrpc_notify_socket+0x1db/0x5d0 [ 209.691745][ T1812] ? afs_put_call+0xa40/0xa40 [ 209.691745][ T1812] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 209.691745][ T1812] rxrpc_call_completed+0xca/0xf0 [ 209.691745][ T1812] rxrpc_discard_prealloc+0x781/0xab0 [ 209.691745][ T1812] ? lock_sock_nested+0x94/0x110 [ 209.691745][ T1812] rxrpc_listen+0x147/0x360 [ 209.691745][ T1812] afs_close_socket+0x95/0x320 [ 209.691745][ T1812] ? afs_purge_servers+0x181/0x330 [ 209.691745][ T1812] ? afs_rx_discard_new_call+0x50/0x50 [ 209.691745][ T1812] ? init_wait_var_entry+0x200/0x200 [ 209.691745][ T1812] afs_net_exit+0x1c4/0x310 [ 209.691745][ T1812] ? afs_net_init+0xe90/0xe90 [ 209.691745][ T1812] ops_exit_list.isra.0+0xa8/0x150 [ 209.691745][ T1812] cleanup_net+0x511/0xa50 [ 209.691745][ T1812] ? unregister_pernet_device+0x70/0x70 [ 209.691745][ T1812] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 209.691745][ T1812] process_one_work+0x965/0x1690 [ 209.691745][ T1812] ? lock_release+0x800/0x800 [ 209.691745][ T1812] ? pwq_dec_nr_in_flight+0x310/0x310 [ 209.691745][ T1812] ? rwlock_bug.part.0+0x90/0x90 [ 209.691745][ T1812] worker_thread+0x96/0xe10 [ 209.691745][ T1812] ? process_one_work+0x1690/0x1690 [ 209.691745][ T1812] kthread+0x3b5/0x4a0 [ 209.691745][ T1812] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 209.691745][ T1812] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 209.691745][ T1812] ret_from_fork+0x1f/0x30 [ 209.691745][ T1812] [ 209.691745][ T1812] Allocated by task 9401: [ 209.691745][ T1812] save_stack+0x1b/0x40 [ 209.691745][ T1812] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 209.691745][ T1812] kmem_cache_alloc_trace+0x153/0x7d0 [ 209.691745][ T1812] afs_alloc_call+0x55/0x630 [ 209.691745][ T1812] afs_charge_preallocation+0xe9/0x2d0 [ 209.691745][ T1812] afs_open_socket+0x292/0x360 [ 209.691745][ T1812] afs_net_init+0xab4/0xe90 [ 209.691745][ T1812] ops_init+0xaf/0x420 [ 209.691745][ T1812] setup_net+0x2de/0x860 [ 209.691745][ T1812] copy_net_ns+0x293/0x590 [ 209.691745][ T1812] create_new_namespaces+0x3fb/0xb30 [ 209.691745][ T1812] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 209.691745][ T1812] ksys_unshare+0x43d/0x8e0 [ 209.691745][ T1812] __ia32_sys_unshare+0x2c/0x40 [ 209.691745][ T1812] do_syscall_32_irqs_on+0x3f/0x60 [ 209.691745][ T1812] do_fast_syscall_32+0x7f/0x120 [ 209.691745][ T1812] entry_SYSENTER_compat+0x6d/0x7c [ 209.691745][ T1812] [ 209.691745][ T1812] Freed by task 1812: [ 209.691745][ T1812] save_stack+0x1b/0x40 [ 209.691745][ T1812] __kasan_slab_free+0xf7/0x140 [ 209.691745][ T1812] kfree+0x109/0x2b0 [ 209.691745][ T1812] afs_put_call+0x585/0xa40 [ 209.691745][ T1812] rxrpc_discard_prealloc+0x764/0xab0 [ 211.400478][ T1812] rxrpc_listen+0x147/0x360 [ 211.400478][ T1812] afs_close_socket+0x95/0x320 [ 211.400478][ T1812] afs_net_exit+0x1c4/0x310 [ 211.400478][ T1812] ops_exit_list.isra.0+0xa8/0x150 [ 211.400478][ T1812] cleanup_net+0x511/0xa50 [ 211.400478][ T1812] process_one_work+0x965/0x1690 [ 211.400478][ T1812] worker_thread+0x96/0xe10 [ 211.400478][ T1812] kthread+0x3b5/0x4a0 [ 211.400478][ T1812] ret_from_fork+0x1f/0x30 [ 211.400478][ T1812] [ 211.400478][ T1812] The buggy address belongs to the object at ffff888029dfb000 [ 211.400478][ T1812] which belongs to the cache kmalloc-1k of size 1024 [ 211.400478][ T1812] The buggy address is located 484 bytes inside of [ 211.400478][ T1812] 1024-byte region [ffff888029dfb000, ffff888029dfb400) [ 211.400478][ T1812] The buggy address belongs to the page: [ 211.400478][ T1812] page:ffffea0000a77ec0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 211.400478][ T1812] flags: 0xfffe0000000200(slab) [ 211.400478][ T1812] raw: 00fffe0000000200 ffffea0000a56c48 ffffea0000a11888 ffff88802c800c40 [ 211.400478][ T1812] raw: 0000000000000000 ffff888029dfb000 0000000100000002 0000000000000000 [ 211.400478][ T1812] page dumped because: kasan: bad access detected [ 211.400478][ T1812] [ 211.400478][ T1812] Memory state around the buggy address: [ 211.400478][ T1812] ffff888029dfb080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 211.400478][ T1812] ffff888029dfb100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 211.400478][ T1812] >ffff888029dfb180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 211.400478][ T1812] ^ [ 211.400478][ T1812] ffff888029dfb200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 211.400478][ T1812] ffff888029dfb280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 211.400478][ T1812] ================================================================== [ 211.400478][ T1812] Disabling lock debugging due to kernel taint [ 212.470996][ T1812] Kernel panic - not syncing: panic_on_warn set ... [ 212.480498][ T1812] CPU: 2 PID: 1812 Comm: kworker/u16:1 Tainted: G B 5.8.0-rc2-syzkaller #0 [ 212.480498][ T1812] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [ 212.480498][ T1812] Workqueue: netns cleanup_net [ 212.480498][ T1812] Call Trace: [ 212.480498][ T1812] dump_stack+0x18f/0x20d [ 212.480498][ T1812] ? afs_wake_up_async_call+0x600/0x770 [ 212.480498][ T1812] ? afs_put_call+0xa40/0xa40 [ 212.480498][ T1812] panic+0x2e3/0x75c [ 212.480498][ T1812] ? __warn_printk+0xf3/0xf3 [ 212.480498][ T1812] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 212.480498][ T1812] ? trace_hardirqs_on+0x55/0x220 [ 212.480498][ T1812] ? afs_wake_up_async_call+0x6aa/0x770 [ 212.480498][ T1812] ? afs_wake_up_async_call+0x6aa/0x770 [ 212.480498][ T1812] ? afs_put_call+0xa40/0xa40 [ 212.480498][ T1812] end_report+0x4d/0x53 [ 212.480498][ T1812] kasan_report.cold+0xd/0x37 [ 212.480498][ T1812] ? rcu_read_lock_held_common+0x91/0xa0 [ 212.480498][ T1812] ? afs_wake_up_async_call+0x6aa/0x770 [ 212.480498][ T1812] afs_wake_up_async_call+0x6aa/0x770 [ 212.480498][ T1812] ? afs_close_socket+0x320/0x320 [ 212.480498][ T1812] ? afs_put_call+0xa40/0xa40 [ 212.480498][ T1812] rxrpc_notify_socket+0x1db/0x5d0 [ 212.480498][ T1812] ? afs_put_call+0xa40/0xa40 [ 212.480498][ T1812] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 212.480498][ T1812] rxrpc_call_completed+0xca/0xf0 [ 212.480498][ T1812] rxrpc_discard_prealloc+0x781/0xab0 [ 212.480498][ T1812] ? lock_sock_nested+0x94/0x110 [ 212.480498][ T1812] rxrpc_listen+0x147/0x360 [ 212.480498][ T1812] afs_close_socket+0x95/0x320 [ 212.480498][ T1812] ? afs_purge_servers+0x181/0x330 [ 212.480498][ T1812] ? afs_rx_discard_new_call+0x50/0x50 [ 212.480498][ T1812] ? init_wait_var_entry+0x200/0x200 [ 212.480498][ T1812] afs_net_exit+0x1c4/0x310 [ 212.480498][ T1812] ? afs_net_init+0xe90/0xe90 [ 212.480498][ T1812] ops_exit_list.isra.0+0xa8/0x150 [ 212.480498][ T1812] cleanup_net+0x511/0xa50 [ 212.480498][ T1812] ? unregister_pernet_device+0x70/0x70 [ 212.480498][ T1812] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 212.480498][ T1812] process_one_work+0x965/0x1690 [ 212.480498][ T1812] ? lock_release+0x800/0x800 [ 212.480498][ T1812] ? pwq_dec_nr_in_flight+0x310/0x310 [ 212.480498][ T1812] ? rwlock_bug.part.0+0x90/0x90 [ 212.480498][ T1812] worker_thread+0x96/0xe10 [ 212.480498][ T1812] ? process_one_work+0x1690/0x1690 [ 212.480498][ T1812] kthread+0x3b5/0x4a0 [ 212.480498][ T1812] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 212.480498][ T1812] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 212.480498][ T1812] ret_from_fork+0x1f/0x30 [ 212.480498][ T1812] Kernel Offset: disabled [ 212.480498][ T1812] Rebooting in 86400 seconds..