[ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.62' (ECDSA) to the list of known hosts. 2020/06/19 17:50:39 fuzzer started 2020/06/19 17:50:39 connecting to host at 10.128.0.26:40651 2020/06/19 17:50:39 checking machine... 2020/06/19 17:50:39 checking revisions... 2020/06/19 17:50:39 testing simple program... syzkaller login: [ 62.390481][ T6814] IPVS: ftp: loaded support on port[0] = 21 2020/06/19 17:50:39 building call list... [ 62.722205][ T79] tipc: TX() has been purged, node left! [ 63.244455][ T79] ================================================================== [ 63.252708][ T79] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 63.260602][ T79] Write of size 1 at addr ffff8880a681a9e4 by task kworker/u4:3/79 [ 63.268478][ T79] [ 63.270811][ T79] CPU: 1 PID: 79 Comm: kworker/u4:3 Not tainted 5.8.0-rc1-syzkaller #0 [ 63.279037][ T79] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.289113][ T79] Workqueue: netns cleanup_net [ 63.293888][ T79] Call Trace: [ 63.297184][ T79] dump_stack+0x18f/0x20d [ 63.301537][ T79] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.307098][ T79] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.312644][ T79] ? afs_put_call+0xa40/0xa40 [ 63.317323][ T79] print_address_description.constprop.0.cold+0xd3/0x413 [ 63.324370][ T79] ? vprintk_func+0x97/0x1a6 [ 63.328969][ T79] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.334521][ T79] kasan_report.cold+0x1f/0x37 [ 63.339292][ T79] ? rcu_read_lock_held_common+0x51/0xa0 [ 63.344923][ T79] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.350475][ T79] afs_wake_up_async_call+0x6aa/0x770 [ 63.355845][ T79] ? afs_close_socket+0x320/0x320 [ 63.360877][ T79] ? afs_put_call+0xa40/0xa40 [ 63.365553][ T79] rxrpc_notify_socket+0x1db/0x5d0 [ 63.370667][ T79] ? afs_put_call+0xa40/0xa40 [ 63.375344][ T79] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 63.381760][ T79] rxrpc_call_completed+0xca/0xf0 [ 63.386790][ T79] rxrpc_discard_prealloc+0x781/0xab0 [ 63.392183][ T79] ? lock_sock_nested+0x94/0x110 [ 63.397133][ T79] rxrpc_listen+0x147/0x360 [ 63.401639][ T79] afs_close_socket+0x95/0x320 [ 63.406399][ T79] ? afs_purge_servers+0x16d/0x300 [ 63.411521][ T79] ? afs_rx_discard_new_call+0x50/0x50 [ 63.417009][ T79] ? init_wait_var_entry+0x200/0x200 [ 63.422300][ T79] ? rcu_read_lock_held_common+0xa0/0xa0 [ 63.427938][ T79] ? check_preemption_disabled+0x38/0x220 [ 63.433673][ T79] afs_net_exit+0x1bc/0x310 [ 63.438190][ T79] ? afs_net_init+0xe30/0xe30 [ 63.442868][ T79] ops_exit_list.isra.0+0xa8/0x150 [ 63.447990][ T79] cleanup_net+0x511/0xa50 [ 63.452410][ T79] ? unregister_pernet_device+0x70/0x70 [ 63.457960][ T79] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.463954][ T79] process_one_work+0x965/0x1690 [ 63.468902][ T79] ? lock_release+0x800/0x800 [ 63.473782][ T79] ? pwq_dec_nr_in_flight+0x310/0x310 [ 63.479157][ T79] ? rwlock_bug.part.0+0x90/0x90 [ 63.484110][ T79] worker_thread+0x96/0xe10 [ 63.488705][ T79] ? process_one_work+0x1690/0x1690 [ 63.493921][ T79] kthread+0x3b5/0x4a0 [ 63.498165][ T79] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.503896][ T79] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.509628][ T79] ret_from_fork+0x1f/0x30 [ 63.514083][ T79] [ 63.516411][ T79] Allocated by task 6814: [ 63.520846][ T79] save_stack+0x1b/0x40 [ 63.525018][ T79] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 63.530651][ T79] kmem_cache_alloc_trace+0x153/0x7d0 [ 63.536106][ T79] afs_alloc_call+0x55/0x630 [ 63.540695][ T79] afs_charge_preallocation+0xe9/0x2d0 [ 63.546269][ T79] afs_open_socket+0x292/0x360 [ 63.551294][ T79] afs_net_init+0xa6c/0xe30 [ 63.555806][ T79] ops_init+0xaf/0x420 [ 63.559873][ T79] setup_net+0x2de/0x860 [ 63.564143][ T79] copy_net_ns+0x293/0x590 [ 63.568567][ T79] create_new_namespaces+0x3fb/0xb30 [ 63.573851][ T79] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 63.579479][ T79] ksys_unshare+0x43d/0x8e0 [ 63.583978][ T79] __x64_sys_unshare+0x2d/0x40 [ 63.588755][ T79] do_syscall_64+0x60/0xe0 [ 63.593173][ T79] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 63.599051][ T79] [ 63.601377][ T79] Freed by task 79: [ 63.605185][ T79] save_stack+0x1b/0x40 [ 63.609335][ T79] __kasan_slab_free+0xf7/0x140 [ 63.614178][ T79] kfree+0x109/0x2b0 [ 63.618095][ T79] afs_put_call+0x585/0xa40 [ 63.622604][ T79] rxrpc_discard_prealloc+0x764/0xab0 [ 63.627974][ T79] rxrpc_listen+0x147/0x360 [ 63.632493][ T79] afs_close_socket+0x95/0x320 [ 63.637258][ T79] afs_net_exit+0x1bc/0x310 [ 63.641758][ T79] ops_exit_list.isra.0+0xa8/0x150 [ 63.646872][ T79] cleanup_net+0x511/0xa50 [ 63.651286][ T79] process_one_work+0x965/0x1690 [ 63.657363][ T79] worker_thread+0x96/0xe10 [ 63.661866][ T79] kthread+0x3b5/0x4a0 [ 63.665953][ T79] ret_from_fork+0x1f/0x30 [ 63.670372][ T79] [ 63.672706][ T79] The buggy address belongs to the object at ffff8880a681a800 [ 63.672706][ T79] which belongs to the cache kmalloc-1k of size 1024 [ 63.687932][ T79] The buggy address is located 484 bytes inside of [ 63.687932][ T79] 1024-byte region [ffff8880a681a800, ffff8880a681ac00) [ 63.701638][ T79] The buggy address belongs to the page: [ 63.707653][ T79] page:ffffea00029a0680 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 63.716878][ T79] flags: 0xfffe0000000200(slab) [ 63.721856][ T79] raw: 00fffe0000000200 ffffea0002a070c8 ffffea00028da048 ffff8880aa000c40 [ 63.730731][ T79] raw: 0000000000000000 ffff8880a681a000 0000000100000002 0000000000000000 [ 63.739310][ T79] page dumped because: kasan: bad access detected [ 63.745831][ T79] [ 63.748152][ T79] Memory state around the buggy address: [ 63.753786][ T79] ffff8880a681a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.762208][ T79] ffff8880a681a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.770283][ T79] >ffff8880a681a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.778356][ T79] ^ [ 63.785607][ T79] ffff8880a681aa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.794107][ T79] ffff8880a681aa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.802594][ T79] ================================================================== [ 63.810669][ T79] Disabling lock debugging due to kernel taint [ 63.816884][ T79] Kernel panic - not syncing: panic_on_warn set ... [ 63.823505][ T79] CPU: 1 PID: 79 Comm: kworker/u4:3 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 63.833120][ T79] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.843176][ T79] Workqueue: netns cleanup_net [ 63.847926][ T79] Call Trace: [ 63.851493][ T79] dump_stack+0x18f/0x20d [ 63.855829][ T79] ? afs_wake_up_async_call+0x680/0x770 [ 63.861382][ T79] ? afs_put_call+0xa40/0xa40 [ 63.866056][ T79] panic+0x2e3/0x75c [ 63.869960][ T79] ? __warn_printk+0xf3/0xf3 [ 63.874641][ T79] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 63.880793][ T79] ? trace_hardirqs_on+0x55/0x220 [ 63.885824][ T79] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.891390][ T79] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.896929][ T79] ? afs_put_call+0xa40/0xa40 [ 63.901617][ T79] end_report+0x4d/0x53 [ 63.905769][ T79] kasan_report.cold+0xd/0x37 [ 63.910441][ T79] ? rcu_read_lock_held_common+0x51/0xa0 [ 63.916154][ T79] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.921716][ T79] afs_wake_up_async_call+0x6aa/0x770 [ 63.927102][ T79] ? afs_close_socket+0x320/0x320 [ 63.932138][ T79] ? afs_put_call+0xa40/0xa40 [ 63.937081][ T79] rxrpc_notify_socket+0x1db/0x5d0 [ 63.942185][ T79] ? afs_put_call+0xa40/0xa40 [ 63.946868][ T79] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 63.953282][ T79] rxrpc_call_completed+0xca/0xf0 [ 63.958571][ T79] rxrpc_discard_prealloc+0x781/0xab0 [ 63.963955][ T79] ? lock_sock_nested+0x94/0x110 [ 63.968910][ T79] rxrpc_listen+0x147/0x360 [ 63.973423][ T79] afs_close_socket+0x95/0x320 [ 63.978178][ T79] ? afs_purge_servers+0x16d/0x300 [ 63.983296][ T79] ? afs_rx_discard_new_call+0x50/0x50 [ 63.988937][ T79] ? init_wait_var_entry+0x200/0x200 [ 63.994480][ T79] ? rcu_read_lock_held_common+0xa0/0xa0 [ 64.000113][ T79] ? check_preemption_disabled+0x38/0x220 [ 64.005848][ T79] afs_net_exit+0x1bc/0x310 [ 64.010349][ T79] ? afs_net_init+0xe30/0xe30 [ 64.015124][ T79] ops_exit_list.isra.0+0xa8/0x150 [ 64.020329][ T79] cleanup_net+0x511/0xa50 [ 64.024743][ T79] ? unregister_pernet_device+0x70/0x70 [ 64.030289][ T79] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.036266][ T79] process_one_work+0x965/0x1690 [ 64.041199][ T79] ? lock_release+0x800/0x800 [ 64.045971][ T79] ? pwq_dec_nr_in_flight+0x310/0x310 [ 64.051423][ T79] ? rwlock_bug.part.0+0x90/0x90 [ 64.056373][ T79] worker_thread+0x96/0xe10 [ 64.060875][ T79] ? process_one_work+0x1690/0x1690 [ 64.066063][ T79] kthread+0x3b5/0x4a0 [ 64.070126][ T79] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.075856][ T79] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.082450][ T79] ret_from_fork+0x1f/0x30 [ 64.088325][ T79] Kernel Offset: disabled [ 64.092847][ T79] Rebooting in 86400 seconds..