Warning: Permanently added '[localhost]:1569' (ECDSA) to the list of known hosts. 2020/06/18 12:49:03 fuzzer started 2020/06/18 12:49:03 connecting to host at 10.0.2.10:37919 2020/06/18 12:49:03 checking machine... 2020/06/18 12:49:03 checking revisions... 2020/06/18 12:49:04 testing simple program... syzkaller login: [ 93.372052][ T8190] IPVS: ftp: loaded support on port[0] = 21 2020/06/18 12:49:04 building call list... [ 93.961630][ T1809] tipc: TX() has been purged, node left! [ 94.685844][ T1809] ================================================================== [ 94.690252][ T1809] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 94.690252][ T1809] Write of size 1 at addr ffff888014e409e4 by task kworker/u16:1/1809 [ 94.690252][ T1809] [ 94.690252][ T1809] CPU: 0 PID: 1809 Comm: kworker/u16:1 Not tainted 5.8.0-rc1-syzkaller #0 [ 94.740901][ T1809] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [ 94.740901][ T1809] Workqueue: netns cleanup_net [ 94.740901][ T1809] Call Trace: [ 94.740901][ T1809] dump_stack+0x18f/0x20d [ 94.787697][ T1809] ? afs_wake_up_async_call+0x6aa/0x770 [ 94.788215][ T1809] ? afs_wake_up_async_call+0x6aa/0x770 [ 94.788215][ T1809] ? afs_put_call+0xa40/0xa40 [ 94.788215][ T1809] print_address_description.constprop.0.cold+0xd3/0x413 [ 94.788215][ T1809] ? vprintk_func+0x97/0x1a6 [ 94.788215][ T1809] ? afs_wake_up_async_call+0x6aa/0x770 [ 94.788215][ T1809] kasan_report.cold+0x1f/0x37 [ 94.788215][ T1809] ? rcu_read_lock_held_common+0x51/0xa0 [ 94.788215][ T1809] ? afs_wake_up_async_call+0x6aa/0x770 [ 94.788215][ T1809] afs_wake_up_async_call+0x6aa/0x770 [ 94.788215][ T1809] ? afs_close_socket+0x320/0x320 [ 94.788215][ T1809] ? afs_put_call+0xa40/0xa40 [ 94.788215][ T1809] rxrpc_notify_socket+0x1db/0x5d0 [ 94.788215][ T1809] ? afs_put_call+0xa40/0xa40 [ 94.788215][ T1809] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 94.788215][ T1809] rxrpc_call_completed+0xca/0xf0 [ 94.788215][ T1809] rxrpc_discard_prealloc+0x781/0xab0 [ 94.788215][ T1809] ? lock_sock_nested+0x94/0x110 [ 94.788215][ T1809] rxrpc_listen+0x147/0x360 [ 94.788215][ T1809] afs_close_socket+0x95/0x320 [ 94.788215][ T1809] ? afs_purge_servers+0x16d/0x300 [ 94.788215][ T1809] ? afs_rx_discard_new_call+0x50/0x50 [ 94.788215][ T1809] ? init_wait_var_entry+0x200/0x200 [ 94.788215][ T1809] ? rcu_read_lock_held_common+0xa0/0xa0 [ 94.788215][ T1809] ? check_preemption_disabled+0x38/0x220 [ 94.788215][ T1809] afs_net_exit+0x1bc/0x310 [ 94.788215][ T1809] ? afs_net_init+0xe30/0xe30 [ 94.788215][ T1809] ops_exit_list.isra.0+0xa8/0x150 [ 94.788215][ T1809] cleanup_net+0x511/0xa50 [ 94.788215][ T1809] ? unregister_pernet_device+0x70/0x70 [ 94.788215][ T1809] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 94.788215][ T1809] process_one_work+0x965/0x1690 [ 94.788215][ T1809] ? lock_release+0x800/0x800 [ 94.788215][ T1809] ? pwq_dec_nr_in_flight+0x310/0x310 [ 94.788215][ T1809] ? rwlock_bug.part.0+0x90/0x90 [ 94.788215][ T1809] worker_thread+0x96/0xe10 [ 94.788215][ T1809] ? process_one_work+0x1690/0x1690 [ 94.788215][ T1809] kthread+0x3b5/0x4a0 [ 94.788215][ T1809] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 94.788215][ T1809] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 94.788215][ T1809] ret_from_fork+0x1f/0x30 [ 94.788215][ T1809] [ 94.788215][ T1809] Allocated by task 8190: [ 94.788215][ T1809] save_stack+0x1b/0x40 [ 94.788215][ T1809] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 94.788215][ T1809] kmem_cache_alloc_trace+0x153/0x7d0 [ 94.788215][ T1809] afs_alloc_call+0x55/0x630 [ 94.788215][ T1809] afs_charge_preallocation+0xe9/0x2d0 [ 94.788215][ T1809] afs_open_socket+0x292/0x360 [ 94.788215][ T1809] afs_net_init+0xa6c/0xe30 [ 94.788215][ T1809] ops_init+0xaf/0x420 [ 94.788215][ T1809] setup_net+0x2de/0x860 [ 94.788215][ T1809] copy_net_ns+0x293/0x590 [ 94.788215][ T1809] create_new_namespaces+0x3fb/0xb30 [ 94.788215][ T1809] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 94.788215][ T1809] ksys_unshare+0x43d/0x8e0 [ 94.788215][ T1809] __ia32_sys_unshare+0x2c/0x40 [ 94.788215][ T1809] do_syscall_32_irqs_on+0x3f/0x60 [ 94.788215][ T1809] do_fast_syscall_32+0x7f/0x120 [ 94.788215][ T1809] entry_SYSENTER_compat+0x6d/0x7c [ 94.788215][ T1809] [ 94.788215][ T1809] Freed by task 1809: [ 94.788215][ T1809] save_stack+0x1b/0x40 [ 94.788215][ T1809] __kasan_slab_free+0xf7/0x140 [ 94.788215][ T1809] kfree+0x109/0x2b0 [ 94.788215][ T1809] afs_put_call+0x585/0xa40 [ 94.788215][ T1809] rxrpc_discard_prealloc+0x764/0xab0 [ 94.788215][ T1809] rxrpc_listen+0x147/0x360 [ 94.788215][ T1809] afs_close_socket+0x95/0x320 [ 94.788215][ T1809] afs_net_exit+0x1bc/0x310 [ 94.788215][ T1809] ops_exit_list.isra.0+0xa8/0x150 [ 94.788215][ T1809] cleanup_net+0x511/0xa50 [ 94.788215][ T1809] process_one_work+0x965/0x1690 [ 94.788215][ T1809] worker_thread+0x96/0xe10 [ 94.788215][ T1809] kthread+0x3b5/0x4a0 [ 95.352713][ T1809] ret_from_fork+0x1f/0x30 [ 95.352713][ T1809] [ 95.352713][ T1809] The buggy address belongs to the object at ffff888014e40800 [ 95.352713][ T1809] which belongs to the cache kmalloc-1k of size 1024 [ 95.352713][ T1809] The buggy address is located 484 bytes inside of [ 95.352713][ T1809] 1024-byte region [ffff888014e40800, ffff888014e40c00) [ 95.352713][ T1809] The buggy address belongs to the page: [ 95.352713][ T1809] page:ffffea0000539000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 95.352713][ T1809] flags: 0xfffe0000000200(slab) [ 95.352713][ T1809] raw: 00fffe0000000200 ffffea0000535f48 ffffea0000539088 ffff88802c800c40 [ 95.352713][ T1809] raw: 0000000000000000 ffff888014e40000 0000000100000002 0000000000000000 [ 95.352713][ T1809] page dumped because: kasan: bad access detected [ 95.352713][ T1809] [ 95.352713][ T1809] Memory state around the buggy address: [ 95.352713][ T1809] ffff888014e40880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 95.352713][ T1809] ffff888014e40900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 95.352713][ T1809] >ffff888014e40980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 95.352713][ T1809] ^ [ 95.352713][ T1809] ffff888014e40a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 95.352713][ T1809] ffff888014e40a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 95.352713][ T1809] ================================================================== [ 95.352713][ T1809] Disabling lock debugging due to kernel taint [ 95.572476][ T1809] Kernel panic - not syncing: panic_on_warn set ... [ 95.582214][ T1809] CPU: 0 PID: 1809 Comm: kworker/u16:1 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 95.582214][ T1809] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [ 95.582214][ T1809] Workqueue: netns cleanup_net [ 95.582214][ T1809] Call Trace: [ 95.582214][ T1809] dump_stack+0x18f/0x20d [ 95.582214][ T1809] ? afs_wake_up_async_call+0x670/0x770 [ 95.582214][ T1809] ? afs_put_call+0xa40/0xa40 [ 95.582214][ T1809] panic+0x2e3/0x75c [ 95.582214][ T1809] ? __warn_printk+0xf3/0xf3 [ 95.582214][ T1809] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 95.582214][ T1809] ? trace_hardirqs_on+0x55/0x220 [ 95.582214][ T1809] ? afs_wake_up_async_call+0x6aa/0x770 [ 95.582214][ T1809] ? afs_wake_up_async_call+0x6aa/0x770 [ 95.582214][ T1809] ? afs_put_call+0xa40/0xa40 [ 95.582214][ T1809] end_report+0x4d/0x53 [ 95.582214][ T1809] kasan_report.cold+0xd/0x37 [ 95.582214][ T1809] ? rcu_read_lock_held_common+0x51/0xa0 [ 95.582214][ T1809] ? afs_wake_up_async_call+0x6aa/0x770 [ 95.582214][ T1809] afs_wake_up_async_call+0x6aa/0x770 [ 95.582214][ T1809] ? afs_close_socket+0x320/0x320 [ 95.582214][ T1809] ? afs_put_call+0xa40/0xa40 [ 95.582214][ T1809] rxrpc_notify_socket+0x1db/0x5d0 [ 95.582214][ T1809] ? afs_put_call+0xa40/0xa40 [ 95.582214][ T1809] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 95.582214][ T1809] rxrpc_call_completed+0xca/0xf0 [ 95.582214][ T1809] rxrpc_discard_prealloc+0x781/0xab0 [ 95.582214][ T1809] ? lock_sock_nested+0x94/0x110 [ 95.582214][ T1809] rxrpc_listen+0x147/0x360 [ 95.582214][ T1809] afs_close_socket+0x95/0x320 [ 95.582214][ T1809] ? afs_purge_servers+0x16d/0x300 [ 95.582214][ T1809] ? afs_rx_discard_new_call+0x50/0x50 [ 95.582214][ T1809] ? init_wait_var_entry+0x200/0x200 [ 95.582214][ T1809] ? rcu_read_lock_held_common+0xa0/0xa0 [ 95.582214][ T1809] ? check_preemption_disabled+0x38/0x220 [ 95.582214][ T1809] afs_net_exit+0x1bc/0x310 [ 95.582214][ T1809] ? afs_net_init+0xe30/0xe30 [ 95.582214][ T1809] ops_exit_list.isra.0+0xa8/0x150 [ 95.582214][ T1809] cleanup_net+0x511/0xa50 [ 95.582214][ T1809] ? unregister_pernet_device+0x70/0x70 [ 95.582214][ T1809] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 95.582214][ T1809] process_one_work+0x965/0x1690 [ 95.582214][ T1809] ? lock_release+0x800/0x800 [ 95.582214][ T1809] ? pwq_dec_nr_in_flight+0x310/0x310 [ 95.582214][ T1809] ? rwlock_bug.part.0+0x90/0x90 [ 95.582214][ T1809] worker_thread+0x96/0xe10 [ 95.920943][ T1809] ? process_one_work+0x1690/0x1690 [ 95.940740][ T1809] kthread+0x3b5/0x4a0 [ 95.950167][ T1809] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 95.960240][ T1809] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 95.970340][ T1809] ret_from_fork+0x1f/0x30 [ 95.980118][ T1809] Kernel Offset: disabled [ 95.980118][ T1809] Rebooting in 86400 seconds..