Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.140' (ECDSA) to the list of known hosts. 2020/06/21 15:24:34 fuzzer started 2020/06/21 15:24:34 connecting to host at 10.128.0.26:41803 2020/06/21 15:24:34 checking machine... 2020/06/21 15:24:34 checking revisions... 2020/06/21 15:24:34 testing simple program... syzkaller login: [ 60.381813][ T6829] IPVS: ftp: loaded support on port[0] = 21 2020/06/21 15:24:35 building call list... [ 60.747106][ T26] tipc: TX() has been purged, node left! [ 61.249628][ T26] ================================================================== [ 61.257971][ T26] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 61.265943][ T26] Write of size 1 at addr ffff88809300f1e4 by task kworker/u4:2/26 [ 61.273818][ T26] [ 61.276151][ T26] CPU: 1 PID: 26 Comm: kworker/u4:2 Not tainted 5.8.0-rc1-syzkaller #0 [ 61.285168][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.296106][ T26] Workqueue: netns cleanup_net [ 61.301129][ T26] Call Trace: [ 61.304435][ T26] dump_stack+0x18f/0x20d [ 61.308775][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.314931][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.320476][ T26] ? afs_put_call+0xa40/0xa40 [ 61.325328][ T26] print_address_description.constprop.0.cold+0xd3/0x413 [ 61.332359][ T26] ? vprintk_func+0x97/0x1a6 [ 61.336953][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.342497][ T26] kasan_report.cold+0x1f/0x37 [ 61.347270][ T26] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.352989][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.358550][ T26] afs_wake_up_async_call+0x6aa/0x770 [ 61.363932][ T26] ? afs_close_socket+0x320/0x320 [ 61.368961][ T26] ? afs_put_call+0xa40/0xa40 [ 61.373640][ T26] rxrpc_notify_socket+0x1db/0x5d0 [ 61.378801][ T26] ? afs_put_call+0xa40/0xa40 [ 61.383480][ T26] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.389902][ T26] rxrpc_call_completed+0xca/0xf0 [ 61.394934][ T26] rxrpc_discard_prealloc+0x781/0xab0 [ 61.400309][ T26] ? lock_sock_nested+0x94/0x110 [ 61.405256][ T26] rxrpc_listen+0x147/0x360 [ 61.409850][ T26] afs_close_socket+0x95/0x320 [ 61.414646][ T26] ? afs_purge_servers+0x181/0x330 [ 61.419764][ T26] ? afs_rx_discard_new_call+0x50/0x50 [ 61.425229][ T26] ? init_wait_var_entry+0x200/0x200 [ 61.430530][ T26] afs_net_exit+0x1c4/0x310 [ 61.435033][ T26] ? afs_net_init+0xe90/0xe90 [ 61.439712][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 61.444827][ T26] cleanup_net+0x511/0xa50 [ 61.449246][ T26] ? unregister_pernet_device+0x70/0x70 [ 61.454796][ T26] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.460784][ T26] process_one_work+0x965/0x1690 [ 61.465732][ T26] ? lock_release+0x800/0x800 [ 61.470413][ T26] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.475794][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 61.480752][ T26] worker_thread+0x96/0xe10 [ 61.485278][ T26] ? process_one_work+0x1690/0x1690 [ 61.490500][ T26] kthread+0x3b5/0x4a0 [ 61.494567][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.500283][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.506004][ T26] ret_from_fork+0x1f/0x30 [ 61.510435][ T26] [ 61.512760][ T26] Allocated by task 6829: [ 61.517087][ T26] save_stack+0x1b/0x40 [ 61.521243][ T26] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 61.526873][ T26] kmem_cache_alloc_trace+0x153/0x7d0 [ 61.532243][ T26] afs_alloc_call+0x55/0x630 [ 61.536835][ T26] afs_charge_preallocation+0xe9/0x2d0 [ 61.542289][ T26] afs_open_socket+0x292/0x360 [ 61.547222][ T26] afs_net_init+0xab4/0xe90 [ 61.551721][ T26] ops_init+0xaf/0x420 [ 61.555785][ T26] setup_net+0x2de/0x860 [ 61.560028][ T26] copy_net_ns+0x293/0x590 [ 61.564443][ T26] create_new_namespaces+0x3fb/0xb30 [ 61.569730][ T26] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 61.575357][ T26] ksys_unshare+0x43d/0x8e0 [ 61.579893][ T26] __x64_sys_unshare+0x2d/0x40 [ 61.584741][ T26] do_syscall_64+0x60/0xe0 [ 61.589162][ T26] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.595039][ T26] [ 61.597365][ T26] Freed by task 26: [ 61.601175][ T26] save_stack+0x1b/0x40 [ 61.605331][ T26] __kasan_slab_free+0xf7/0x140 [ 61.610177][ T26] kfree+0x109/0x2b0 [ 61.614070][ T26] afs_put_call+0x585/0xa40 [ 61.618576][ T26] rxrpc_discard_prealloc+0x764/0xab0 [ 61.624049][ T26] rxrpc_listen+0x147/0x360 [ 61.628550][ T26] afs_close_socket+0x95/0x320 [ 61.633306][ T26] afs_net_exit+0x1c4/0x310 [ 61.637825][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 61.642937][ T26] cleanup_net+0x511/0xa50 [ 61.647360][ T26] process_one_work+0x965/0x1690 [ 61.652297][ T26] worker_thread+0x96/0xe10 [ 61.656806][ T26] kthread+0x3b5/0x4a0 [ 61.660875][ T26] ret_from_fork+0x1f/0x30 [ 61.665279][ T26] [ 61.667606][ T26] The buggy address belongs to the object at ffff88809300f000 [ 61.667606][ T26] which belongs to the cache kmalloc-1k of size 1024 [ 61.682745][ T26] The buggy address is located 484 bytes inside of [ 61.682745][ T26] 1024-byte region [ffff88809300f000, ffff88809300f400) [ 61.696117][ T26] The buggy address belongs to the page: [ 61.701752][ T26] page:ffffea00024c03c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 61.711738][ T26] flags: 0xfffe0000000200(slab) [ 61.716597][ T26] raw: 00fffe0000000200 ffffea00025e11c8 ffffea000237b1c8 ffff8880aa000c40 [ 61.725880][ T26] raw: 0000000000000000 ffff88809300f000 0000000100000002 0000000000000000 [ 61.734454][ T26] page dumped because: kasan: bad access detected [ 61.740861][ T26] [ 61.743180][ T26] Memory state around the buggy address: [ 61.748844][ T26] ffff88809300f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.756905][ T26] ffff88809300f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.764979][ T26] >ffff88809300f180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.774943][ T26] ^ [ 61.782831][ T26] ffff88809300f200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.790891][ T26] ffff88809300f280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.798946][ T26] ================================================================== [ 61.806999][ T26] Disabling lock debugging due to kernel taint [ 61.813218][ T26] Kernel panic - not syncing: panic_on_warn set ... [ 61.819890][ T26] CPU: 1 PID: 26 Comm: kworker/u4:2 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 61.829507][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.839563][ T26] Workqueue: netns cleanup_net [ 61.845296][ T26] Call Trace: [ 61.848612][ T26] dump_stack+0x18f/0x20d [ 61.852942][ T26] ? afs_wake_up_async_call+0x5c0/0x770 [ 61.858577][ T26] ? afs_put_call+0xa40/0xa40 [ 61.863243][ T26] panic+0x2e3/0x75c [ 61.867128][ T26] ? __warn_printk+0xf3/0xf3 [ 61.871712][ T26] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 61.877861][ T26] ? trace_hardirqs_on+0x55/0x220 [ 61.882877][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.888416][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.894644][ T26] ? afs_put_call+0xa40/0xa40 [ 61.899318][ T26] end_report+0x4d/0x53 [ 61.903466][ T26] kasan_report.cold+0xd/0x37 [ 61.908136][ T26] ? rcu_read_lock_held_common+0x51/0xa0 [ 61.913758][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 61.919319][ T26] afs_wake_up_async_call+0x6aa/0x770 [ 61.924680][ T26] ? afs_close_socket+0x320/0x320 [ 61.929705][ T26] ? afs_put_call+0xa40/0xa40 [ 61.934376][ T26] rxrpc_notify_socket+0x1db/0x5d0 [ 61.939479][ T26] ? afs_put_call+0xa40/0xa40 [ 61.944148][ T26] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.950554][ T26] rxrpc_call_completed+0xca/0xf0 [ 61.955575][ T26] rxrpc_discard_prealloc+0x781/0xab0 [ 61.961028][ T26] ? lock_sock_nested+0x94/0x110 [ 61.965957][ T26] rxrpc_listen+0x147/0x360 [ 61.970452][ T26] afs_close_socket+0x95/0x320 [ 61.975206][ T26] ? afs_purge_servers+0x181/0x330 [ 61.980305][ T26] ? afs_rx_discard_new_call+0x50/0x50 [ 61.985761][ T26] ? init_wait_var_entry+0x200/0x200 [ 61.991038][ T26] afs_net_exit+0x1c4/0x310 [ 61.995534][ T26] ? afs_net_init+0xe90/0xe90 [ 62.000220][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 62.005342][ T26] cleanup_net+0x511/0xa50 [ 62.009756][ T26] ? unregister_pernet_device+0x70/0x70 [ 62.015294][ T26] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.021278][ T26] process_one_work+0x965/0x1690 [ 62.026213][ T26] ? lock_release+0x800/0x800 [ 62.030882][ T26] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.036243][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 62.041174][ T26] worker_thread+0x96/0xe10 [ 62.045675][ T26] ? process_one_work+0x1690/0x1690 [ 62.050865][ T26] kthread+0x3b5/0x4a0 [ 62.054933][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.061261][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.066990][ T26] ret_from_fork+0x1f/0x30 [ 62.073312][ T26] Kernel Offset: disabled [ 62.077630][ T26] Rebooting in 86400 seconds..