[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.39' (ECDSA) to the list of known hosts. 2020/06/19 05:23:18 fuzzer started 2020/06/19 05:23:19 connecting to host at 10.128.0.26:36983 2020/06/19 05:23:19 checking machine... 2020/06/19 05:23:19 checking revisions... 2020/06/19 05:23:19 testing simple program... syzkaller login: [ 64.988461][ T6807] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 05:23:19 building call list... [ 65.361252][ T7] tipc: TX() has been purged, node left! [ 65.863678][ T7] ================================================================== [ 65.873882][ T7] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 65.884597][ T7] Write of size 1 at addr ffff88809a0449e4 by task kworker/u4:0/7 [ 65.892568][ T7] [ 65.894905][ T7] CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc1-syzkaller #0 [ 65.903697][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.916822][ T7] Workqueue: netns cleanup_net [ 65.921754][ T7] Call Trace: [ 65.926090][ T7] dump_stack+0x18f/0x20d [ 65.930957][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.936512][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.942902][ T7] ? afs_put_call+0xa40/0xa40 [ 65.947596][ T7] print_address_description.constprop.0.cold+0xd3/0x413 [ 65.955113][ T7] ? vprintk_func+0x97/0x1a6 [ 65.959711][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.965435][ T7] kasan_report.cold+0x1f/0x37 [ 65.971186][ T7] ? rcu_read_lock_held_common+0x51/0xa0 [ 65.977078][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 65.982829][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 65.988292][ T7] ? afs_close_socket+0x320/0x320 [ 65.993859][ T7] ? afs_put_call+0xa40/0xa40 [ 65.998578][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 66.004155][ T7] ? afs_put_call+0xa40/0xa40 [ 66.009393][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 66.016105][ T7] rxrpc_call_completed+0xca/0xf0 [ 66.021341][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 66.026742][ T7] ? lock_sock_nested+0x94/0x110 [ 66.031782][ T7] rxrpc_listen+0x147/0x360 [ 66.036291][ T7] afs_close_socket+0x95/0x320 [ 66.041160][ T7] ? afs_purge_servers+0x16d/0x300 [ 66.046304][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 66.051858][ T7] ? init_wait_var_entry+0x200/0x200 [ 66.057167][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 66.062898][ T7] ? check_preemption_disabled+0x38/0x220 [ 66.068627][ T7] afs_net_exit+0x1bc/0x310 [ 66.073137][ T7] ? afs_net_init+0xe30/0xe30 [ 66.078011][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 66.083249][ T7] cleanup_net+0x511/0xa50 [ 66.087670][ T7] ? unregister_pernet_device+0x70/0x70 [ 66.093488][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.099744][ T7] process_one_work+0x965/0x1690 [ 66.104710][ T7] ? lock_release+0x800/0x800 [ 66.109567][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 66.115048][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 66.124260][ T7] worker_thread+0x96/0xe10 [ 66.128788][ T7] ? process_one_work+0x1690/0x1690 [ 66.134095][ T7] kthread+0x3b5/0x4a0 [ 66.138510][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.144230][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.149954][ T7] ret_from_fork+0x1f/0x30 [ 66.154381][ T7] [ 66.156704][ T7] Allocated by task 6807: [ 66.161121][ T7] save_stack+0x1b/0x40 [ 66.165276][ T7] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 66.170931][ T7] kmem_cache_alloc_trace+0x153/0x7d0 [ 66.176350][ T7] afs_alloc_call+0x55/0x630 [ 66.181296][ T7] afs_charge_preallocation+0xe9/0x2d0 [ 66.186848][ T7] afs_open_socket+0x292/0x360 [ 66.192394][ T7] afs_net_init+0xa6c/0xe30 [ 66.196925][ T7] ops_init+0xaf/0x420 [ 66.200998][ T7] setup_net+0x2de/0x860 [ 66.206079][ T7] copy_net_ns+0x293/0x590 [ 66.210513][ T7] create_new_namespaces+0x3fb/0xb30 [ 66.215919][ T7] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 66.221688][ T7] ksys_unshare+0x43d/0x8e0 [ 66.226652][ T7] __x64_sys_unshare+0x2d/0x40 [ 66.231761][ T7] do_syscall_64+0x60/0xe0 [ 66.236176][ T7] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.242424][ T7] [ 66.245106][ T7] Freed by task 7: [ 66.248826][ T7] save_stack+0x1b/0x40 [ 66.253411][ T7] __kasan_slab_free+0xf7/0x140 [ 66.258260][ T7] kfree+0x109/0x2b0 [ 66.262278][ T7] afs_put_call+0x585/0xa40 [ 66.266801][ T7] rxrpc_discard_prealloc+0x764/0xab0 [ 66.272190][ T7] rxrpc_listen+0x147/0x360 [ 66.276720][ T7] afs_close_socket+0x95/0x320 [ 66.281601][ T7] afs_net_exit+0x1bc/0x310 [ 66.286640][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 66.292007][ T7] cleanup_net+0x511/0xa50 [ 66.296781][ T7] process_one_work+0x965/0x1690 [ 66.301725][ T7] worker_thread+0x96/0xe10 [ 66.306429][ T7] kthread+0x3b5/0x4a0 [ 66.310680][ T7] ret_from_fork+0x1f/0x30 [ 66.315084][ T7] [ 66.317413][ T7] The buggy address belongs to the object at ffff88809a044800 [ 66.317413][ T7] which belongs to the cache kmalloc-1k of size 1024 [ 66.331647][ T7] The buggy address is located 484 bytes inside of [ 66.331647][ T7] 1024-byte region [ffff88809a044800, ffff88809a044c00) [ 66.345005][ T7] The buggy address belongs to the page: [ 66.350727][ T7] page:ffffea0002681100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 66.360872][ T7] flags: 0xfffe0000000200(slab) [ 66.365734][ T7] raw: 00fffe0000000200 ffffea000291db08 ffffea00028c27c8 ffff8880aa000c40 [ 66.374408][ T7] raw: 0000000000000000 ffff88809a044000 0000000100000002 0000000000000000 [ 66.382981][ T7] page dumped because: kasan: bad access detected [ 66.389476][ T7] [ 66.391796][ T7] Memory state around the buggy address: [ 66.397427][ T7] ffff88809a044880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.405509][ T7] ffff88809a044900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.413569][ T7] >ffff88809a044980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.421633][ T7] ^ [ 66.428852][ T7] ffff88809a044a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.436938][ T7] ffff88809a044a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.444991][ T7] ================================================================== [ 66.453065][ T7] Disabling lock debugging due to kernel taint [ 66.459262][ T7] Kernel panic - not syncing: panic_on_warn set ... [ 66.466022][ T7] CPU: 0 PID: 7 Comm: kworker/u4:0 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 66.475647][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.485789][ T7] Workqueue: netns cleanup_net [ 66.490673][ T7] Call Trace: [ 66.494233][ T7] dump_stack+0x18f/0x20d [ 66.498561][ T7] ? afs_wake_up_async_call+0x680/0x770 [ 66.504110][ T7] ? afs_put_call+0xa40/0xa40 [ 66.508793][ T7] panic+0x2e3/0x75c [ 66.512770][ T7] ? __warn_printk+0xf3/0xf3 [ 66.517362][ T7] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 66.523514][ T7] ? trace_hardirqs_on+0x55/0x220 [ 66.528547][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.534347][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.539882][ T7] ? afs_put_call+0xa40/0xa40 [ 66.544575][ T7] end_report+0x4d/0x53 [ 66.548727][ T7] kasan_report.cold+0xd/0x37 [ 66.553586][ T7] ? rcu_read_lock_held_common+0x51/0xa0 [ 66.559219][ T7] ? afs_wake_up_async_call+0x6aa/0x770 [ 66.564759][ T7] afs_wake_up_async_call+0x6aa/0x770 [ 66.570316][ T7] ? afs_close_socket+0x320/0x320 [ 66.575347][ T7] ? afs_put_call+0xa40/0xa40 [ 66.580030][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 66.585142][ T7] ? afs_put_call+0xa40/0xa40 [ 66.589812][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 66.596238][ T7] rxrpc_call_completed+0xca/0xf0 [ 66.601344][ T7] rxrpc_discard_prealloc+0x781/0xab0 [ 66.606787][ T7] ? lock_sock_nested+0x94/0x110 [ 66.611832][ T7] rxrpc_listen+0x147/0x360 [ 66.616332][ T7] afs_close_socket+0x95/0x320 [ 66.621350][ T7] ? afs_purge_servers+0x16d/0x300 [ 66.626581][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 66.632221][ T7] ? init_wait_var_entry+0x200/0x200 [ 66.637596][ T7] ? rcu_read_lock_held_common+0xa0/0xa0 [ 66.643242][ T7] ? check_preemption_disabled+0x38/0x220 [ 66.648963][ T7] afs_net_exit+0x1bc/0x310 [ 66.653455][ T7] ? afs_net_init+0xe30/0xe30 [ 66.658123][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 66.663428][ T7] cleanup_net+0x511/0xa50 [ 66.667925][ T7] ? unregister_pernet_device+0x70/0x70 [ 66.673466][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.679450][ T7] process_one_work+0x965/0x1690 [ 66.684481][ T7] ? lock_release+0x800/0x800 [ 66.689415][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 66.694782][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 66.699739][ T7] worker_thread+0x96/0xe10 [ 66.704344][ T7] ? process_one_work+0x1690/0x1690 [ 66.709624][ T7] kthread+0x3b5/0x4a0 [ 66.713959][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.720217][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.725940][ T7] ret_from_fork+0x1f/0x30 [ 66.732308][ T7] Kernel Offset: disabled [ 66.736764][ T7] Rebooting in 86400 seconds..