Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. 2020/06/19 06:29:34 fuzzer started 2020/06/19 06:29:34 connecting to host at 10.128.0.26:33053 2020/06/19 06:29:34 checking machine... 2020/06/19 06:29:34 checking revisions... 2020/06/19 06:29:34 testing simple program... syzkaller login: [ 64.746400][ T6835] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 06:29:34 building call list... [ 65.069971][ T219] tipc: TX() has been purged, node left! [ 65.591827][ T219] ================================================================== [ 65.600087][ T219] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 65.607989][ T219] Write of size 1 at addr ffff8880a61d01e4 by task kworker/u4:6/219 [ 65.616043][ T219] [ 65.618398][ T219] CPU: 0 PID: 219 Comm: kworker/u4:6 Not tainted 5.8.0-rc1-syzkaller #0 [ 65.626715][ T219] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.637031][ T219] Workqueue: netns cleanup_net [ 65.641811][ T219] Call Trace: [ 65.645110][ T219] dump_stack+0x18f/0x20d [ 65.649444][ T219] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.654994][ T219] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.660650][ T219] ? afs_put_call+0xa40/0xa40 [ 65.665335][ T219] print_address_description.constprop.0.cold+0xd3/0x413 [ 65.672540][ T219] ? vprintk_func+0x97/0x1a6 [ 65.677139][ T219] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.682684][ T219] kasan_report.cold+0x1f/0x37 [ 65.687571][ T219] ? rcu_read_lock_held_common+0x51/0xa0 [ 65.693199][ T219] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.698765][ T219] afs_wake_up_async_call+0x6aa/0x770 [ 65.704136][ T219] ? afs_close_socket+0x320/0x320 [ 65.709255][ T219] ? afs_put_call+0xa40/0xa40 [ 65.713933][ T219] rxrpc_notify_socket+0x1db/0x5d0 [ 65.719048][ T219] ? afs_put_call+0xa40/0xa40 [ 65.723726][ T219] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 65.730151][ T219] rxrpc_call_completed+0xca/0xf0 [ 65.735183][ T219] rxrpc_discard_prealloc+0x781/0xab0 [ 65.740647][ T219] ? lock_sock_nested+0x94/0x110 [ 65.745618][ T219] rxrpc_listen+0x147/0x360 [ 65.750123][ T219] afs_close_socket+0x95/0x320 [ 65.754900][ T219] ? afs_purge_servers+0x16d/0x300 [ 65.760020][ T219] ? afs_rx_discard_new_call+0x50/0x50 [ 65.765485][ T219] ? init_wait_var_entry+0x200/0x200 [ 65.770774][ T219] ? rcu_read_lock_held_common+0xa0/0xa0 [ 65.776405][ T219] ? check_preemption_disabled+0x38/0x220 [ 65.782125][ T219] afs_net_exit+0x1bc/0x310 [ 65.786627][ T219] ? afs_net_init+0xe30/0xe30 [ 65.791305][ T219] ops_exit_list.isra.0+0xa8/0x150 [ 65.796420][ T219] cleanup_net+0x511/0xa50 [ 65.800841][ T219] ? unregister_pernet_device+0x70/0x70 [ 65.806392][ T219] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.812381][ T219] process_one_work+0x965/0x1690 [ 65.817352][ T219] ? lock_release+0x800/0x800 [ 65.822031][ T219] ? pwq_dec_nr_in_flight+0x310/0x310 [ 65.827407][ T219] ? rwlock_bug.part.0+0x90/0x90 [ 65.832370][ T219] worker_thread+0x96/0xe10 [ 65.836973][ T219] ? process_one_work+0x1690/0x1690 [ 65.842172][ T219] kthread+0x3b5/0x4a0 [ 65.846244][ T219] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.851966][ T219] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.857688][ T219] ret_from_fork+0x1f/0x30 [ 65.862649][ T219] [ 65.864988][ T219] Allocated by task 6835: [ 65.869340][ T219] save_stack+0x1b/0x40 [ 65.873491][ T219] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 65.879116][ T219] kmem_cache_alloc_trace+0x153/0x7d0 [ 65.884481][ T219] afs_alloc_call+0x55/0x630 [ 65.889064][ T219] afs_charge_preallocation+0xe9/0x2d0 [ 65.894518][ T219] afs_open_socket+0x292/0x360 [ 65.899275][ T219] afs_net_init+0xa6c/0xe30 [ 65.903771][ T219] ops_init+0xaf/0x420 [ 65.907850][ T219] setup_net+0x2de/0x860 [ 65.912089][ T219] copy_net_ns+0x293/0x590 [ 65.916510][ T219] create_new_namespaces+0x3fb/0xb30 [ 65.921802][ T219] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 65.927428][ T219] ksys_unshare+0x43d/0x8e0 [ 65.931928][ T219] __x64_sys_unshare+0x2d/0x40 [ 65.936691][ T219] do_syscall_64+0x60/0xe0 [ 65.941112][ T219] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 65.946992][ T219] [ 65.949328][ T219] Freed by task 219: [ 65.954524][ T219] save_stack+0x1b/0x40 [ 65.958677][ T219] __kasan_slab_free+0xf7/0x140 [ 65.963520][ T219] kfree+0x109/0x2b0 [ 65.967411][ T219] afs_put_call+0x585/0xa40 [ 65.971925][ T219] rxrpc_discard_prealloc+0x764/0xab0 [ 65.977312][ T219] rxrpc_listen+0x147/0x360 [ 65.981826][ T219] afs_close_socket+0x95/0x320 [ 65.986684][ T219] afs_net_exit+0x1bc/0x310 [ 65.991186][ T219] ops_exit_list.isra.0+0xa8/0x150 [ 65.996295][ T219] cleanup_net+0x511/0xa50 [ 66.000725][ T219] process_one_work+0x965/0x1690 [ 66.005689][ T219] worker_thread+0x96/0xe10 [ 66.010207][ T219] kthread+0x3b5/0x4a0 [ 66.014287][ T219] ret_from_fork+0x1f/0x30 [ 66.018700][ T219] [ 66.021033][ T219] The buggy address belongs to the object at ffff8880a61d0000 [ 66.021033][ T219] which belongs to the cache kmalloc-1k of size 1024 [ 66.035090][ T219] The buggy address is located 484 bytes inside of [ 66.035090][ T219] 1024-byte region [ffff8880a61d0000, ffff8880a61d0400) [ 66.048455][ T219] The buggy address belongs to the page: [ 66.054095][ T219] page:ffffea0002987400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 66.063400][ T219] flags: 0xfffe0000000200(slab) [ 66.068263][ T219] raw: 00fffe0000000200 ffffea0002544908 ffffea00027b9cc8 ffff8880aa000c40 [ 66.076940][ T219] raw: 0000000000000000 ffff8880a61d0000 0000000100000002 0000000000000000 [ 66.085514][ T219] page dumped because: kasan: bad access detected [ 66.091915][ T219] [ 66.094238][ T219] Memory state around the buggy address: [ 66.100570][ T219] ffff8880a61d0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.108651][ T219] ffff8880a61d0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.116710][ T219] >ffff8880a61d0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.124795][ T219] ^ [ 66.131995][ T219] ffff8880a61d0200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.140073][ T219] ffff8880a61d0280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.148126][ T219] ================================================================== [ 66.156266][ T219] Disabling lock debugging due to kernel taint [ 66.162461][ T219] Kernel panic - not syncing: panic_on_warn set ... [ 66.169051][ T219] CPU: 0 PID: 219 Comm: kworker/u4:6 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 66.178756][ T219] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.188815][ T219] Workqueue: netns cleanup_net [ 66.193588][ T219] Call Trace: [ 66.196883][ T219] dump_stack+0x18f/0x20d [ 66.201212][ T219] ? afs_wake_up_async_call+0x670/0x770 [ 66.206763][ T219] ? afs_put_call+0xa40/0xa40 [ 66.211441][ T219] panic+0x2e3/0x75c [ 66.215337][ T219] ? __warn_printk+0xf3/0xf3 [ 66.220450][ T219] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 66.226630][ T219] ? trace_hardirqs_on+0x55/0x220 [ 66.231656][ T219] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.237192][ T219] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.242725][ T219] ? afs_put_call+0xa40/0xa40 [ 66.247413][ T219] end_report+0x4d/0x53 [ 66.251569][ T219] kasan_report.cold+0xd/0x37 [ 66.256243][ T219] ? rcu_read_lock_held_common+0x51/0xa0 [ 66.261874][ T219] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.267418][ T219] afs_wake_up_async_call+0x6aa/0x770 [ 66.272870][ T219] ? afs_close_socket+0x320/0x320 [ 66.277890][ T219] ? afs_put_call+0xa40/0xa40 [ 66.282560][ T219] rxrpc_notify_socket+0x1db/0x5d0 [ 66.287670][ T219] ? afs_put_call+0xa40/0xa40 [ 66.292347][ T219] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 66.298790][ T219] rxrpc_call_completed+0xca/0xf0 [ 66.303834][ T219] rxrpc_discard_prealloc+0x781/0xab0 [ 66.309315][ T219] ? lock_sock_nested+0x94/0x110 [ 66.314253][ T219] rxrpc_listen+0x147/0x360 [ 66.318756][ T219] afs_close_socket+0x95/0x320 [ 66.323514][ T219] ? afs_purge_servers+0x16d/0x300 [ 66.328622][ T219] ? afs_rx_discard_new_call+0x50/0x50 [ 66.334076][ T219] ? init_wait_var_entry+0x200/0x200 [ 66.339358][ T219] ? rcu_read_lock_held_common+0xa0/0xa0 [ 66.344986][ T219] ? check_preemption_disabled+0x38/0x220 [ 66.350704][ T219] afs_net_exit+0x1bc/0x310 [ 66.355197][ T219] ? afs_net_init+0xe30/0xe30 [ 66.359866][ T219] ops_exit_list.isra.0+0xa8/0x150 [ 66.364971][ T219] cleanup_net+0x511/0xa50 [ 66.369406][ T219] ? unregister_pernet_device+0x70/0x70 [ 66.374948][ T219] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.380925][ T219] process_one_work+0x965/0x1690 [ 66.385861][ T219] ? lock_release+0x800/0x800 [ 66.390535][ T219] ? pwq_dec_nr_in_flight+0x310/0x310 [ 66.395903][ T219] ? rwlock_bug.part.0+0x90/0x90 [ 66.400837][ T219] worker_thread+0x96/0xe10 [ 66.405343][ T219] ? process_one_work+0x1690/0x1690 [ 66.410537][ T219] kthread+0x3b5/0x4a0 [ 66.414698][ T219] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.420416][ T219] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.426141][ T219] ret_from_fork+0x1f/0x30 [ 66.432018][ T219] Kernel Offset: disabled [ 66.436347][ T219] Rebooting in 86400 seconds..