[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.50' (ECDSA) to the list of known hosts. 2020/07/01 17:11:37 fuzzer started 2020/07/01 17:11:37 connecting to host at 10.128.0.26:39247 2020/07/01 17:11:37 checking machine... 2020/07/01 17:11:37 checking revisions... 2020/07/01 17:11:37 testing simple program... syzkaller login: [ 58.816104][ T6806] IPVS: ftp: loaded support on port[0] = 21 2020/07/01 17:11:38 building call list... [ 59.166406][ T7] tipc: TX() has been purged, node left! [ 59.717914][ T7] ================================================================== [ 59.726156][ T7] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x430/0x4a0 [ 59.734065][ T7] Write of size 1 at addr ffff88809362a1e4 by task kworker/u4:0/7 [ 59.741896][ T7] [ 59.744231][ T7] CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc1-syzkaller #0 [ 59.752371][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.762559][ T7] Workqueue: netns cleanup_net [ 59.767323][ T7] Call Trace: [ 59.770621][ T7] dump_stack+0x18f/0x20d [ 59.774956][ T7] ? afs_wake_up_async_call+0x430/0x4a0 [ 59.780498][ T7] ? afs_wake_up_async_call+0x430/0x4a0 [ 59.786145][ T7] ? afs_put_call+0x440/0x440 [ 59.790821][ T7] print_address_description.constprop.0.cold+0xae/0x436 [ 59.797848][ T7] ? vprintk_func+0x97/0x1a6 [ 59.802525][ T7] ? afs_wake_up_async_call+0x430/0x4a0 [ 59.808064][ T7] kasan_report.cold+0x1f/0x37 [ 59.812833][ T7] ? afs_wake_up_async_call+0x430/0x4a0 [ 59.818379][ T7] afs_wake_up_async_call+0x430/0x4a0 [ 59.823752][ T7] ? afs_close_socket+0x320/0x320 [ 59.828794][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 59.833917][ T7] ? afs_put_call+0x440/0x440 [ 59.838600][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 59.845021][ T7] rxrpc_call_completed+0xd0/0xf0 [ 59.850050][ T7] rxrpc_discard_prealloc+0x777/0xab0 [ 59.855427][ T7] ? lock_sock_nested+0x94/0x110 [ 59.860372][ T7] rxrpc_listen+0x11c/0x330 [ 59.864877][ T7] afs_close_socket+0x95/0x320 [ 59.869639][ T7] ? afs_purge_servers+0x16d/0x300 [ 59.874752][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 59.880213][ T7] ? init_wait_var_entry+0x200/0x200 [ 59.885511][ T7] ? check_preemption_disabled+0x38/0x220 [ 59.891253][ T7] afs_net_exit+0x1bc/0x310 [ 59.895753][ T7] ? __bpf_trace_afs_cb_miss+0x100/0x100 [ 59.901381][ T7] ops_exit_list+0xb0/0x160 [ 59.905889][ T7] cleanup_net+0x4ea/0xa00 [ 59.910301][ T7] ? __schedule+0x887/0x1eb0 [ 59.914890][ T7] ? ops_free_list.part.0+0x3d0/0x3d0 [ 59.920385][ T7] ? check_preemption_disabled+0x38/0x220 [ 59.926116][ T7] process_one_work+0x94c/0x1670 [ 59.931070][ T7] ? lock_release+0x8d0/0x8d0 [ 59.935753][ T7] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 59.941126][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 59.946082][ T7] worker_thread+0x64c/0x1120 [ 59.950778][ T7] ? process_one_work+0x1670/0x1670 [ 59.955982][ T7] kthread+0x3b5/0x4a0 [ 59.960044][ T7] ? __kthread_bind_mask+0xc0/0xc0 [ 59.965155][ T7] ? __kthread_bind_mask+0xc0/0xc0 [ 59.970363][ T7] ret_from_fork+0x1f/0x30 [ 59.974788][ T7] [ 59.977196][ T7] Allocated by task 6806: [ 59.981527][ T7] save_stack+0x1b/0x40 [ 59.985686][ T7] __kasan_kmalloc.constprop.0+0xc2/0xd0 [ 59.991331][ T7] kmem_cache_alloc_trace+0x14f/0x2d0 [ 59.996696][ T7] afs_alloc_call+0x4f/0x360 [ 60.001288][ T7] afs_charge_preallocation+0xe9/0x2d0 [ 60.006744][ T7] afs_open_socket+0x294/0x360 [ 60.011498][ T7] afs_net_init+0xa6c/0xe30 [ 60.016081][ T7] ops_init+0xaf/0x470 [ 60.020140][ T7] setup_net+0x2d8/0x850 [ 60.031321][ T7] copy_net_ns+0x2cf/0x5e0 [ 60.035752][ T7] create_new_namespaces+0x3f6/0xb10 [ 60.041030][ T7] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 60.046657][ T7] ksys_unshare+0x36c/0x9a0 [ 60.053332][ T7] __x64_sys_unshare+0x2d/0x40 [ 60.058107][ T7] do_syscall_64+0x60/0xe0 [ 60.062581][ T7] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 60.068480][ T7] [ 60.070813][ T7] Freed by task 7: [ 60.074554][ T7] save_stack+0x1b/0x40 [ 60.078726][ T7] __kasan_slab_free+0xf5/0x140 [ 60.083572][ T7] kfree+0x103/0x2c0 [ 60.087467][ T7] afs_put_call+0x345/0x440 [ 60.091972][ T7] rxrpc_discard_prealloc+0x75a/0xab0 [ 60.097348][ T7] rxrpc_listen+0x11c/0x330 [ 60.101848][ T7] afs_close_socket+0x95/0x320 [ 60.106607][ T7] afs_net_exit+0x1bc/0x310 [ 60.111106][ T7] ops_exit_list+0xb0/0x160 [ 60.115602][ T7] cleanup_net+0x4ea/0xa00 [ 60.120011][ T7] process_one_work+0x94c/0x1670 [ 60.124948][ T7] worker_thread+0x64c/0x1120 [ 60.129624][ T7] kthread+0x3b5/0x4a0 [ 60.133697][ T7] ret_from_fork+0x1f/0x30 [ 60.138103][ T7] [ 60.140427][ T7] The buggy address belongs to the object at ffff88809362a000 [ 60.140427][ T7] which belongs to the cache kmalloc-1k of size 1024 [ 60.154491][ T7] The buggy address is located 484 bytes inside of [ 60.154491][ T7] 1024-byte region [ffff88809362a000, ffff88809362a400) [ 60.168117][ T7] The buggy address belongs to the page: [ 60.173759][ T7] page:ffffea00024d8a80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 60.182865][ T7] flags: 0xfffe0000000200(slab) [ 60.187722][ T7] raw: 00fffe0000000200 ffffea0002613b48 ffffea00025fa7c8 ffff8880aa000c40 [ 60.196307][ T7] raw: 0000000000000000 ffff88809362a000 0000000100000002 0000000000000000 [ 60.204879][ T7] page dumped because: kasan: bad access detected [ 60.211283][ T7] [ 60.213604][ T7] Memory state around the buggy address: [ 60.219228][ T7] ffff88809362a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.227382][ T7] ffff88809362a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.235439][ T7] >ffff88809362a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.243493][ T7] ^ [ 60.250680][ T7] ffff88809362a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.258741][ T7] ffff88809362a280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.266790][ T7] ================================================================== [ 60.274841][ T7] Disabling lock debugging due to kernel taint [ 60.281039][ T7] Kernel panic - not syncing: panic_on_warn set ... [ 60.287624][ T7] CPU: 0 PID: 7 Comm: kworker/u4:0 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 60.297147][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.307372][ T7] Workqueue: netns cleanup_net [ 60.312121][ T7] Call Trace: [ 60.315403][ T7] dump_stack+0x18f/0x20d [ 60.319738][ T7] ? afs_wake_up_async_call+0x350/0x4a0 [ 60.325287][ T7] ? afs_put_call+0x440/0x440 [ 60.329971][ T7] panic+0x2e3/0x75c [ 60.333866][ T7] ? __warn_printk+0xf3/0xf3 [ 60.338455][ T7] ? afs_wake_up_async_call+0x430/0x4a0 [ 60.344001][ T7] ? trace_hardirqs_on+0x55/0x220 [ 60.349028][ T7] ? afs_wake_up_async_call+0x430/0x4a0 [ 60.354595][ T7] ? afs_wake_up_async_call+0x430/0x4a0 [ 60.360132][ T7] ? afs_put_call+0x440/0x440 [ 60.364808][ T7] end_report+0x4d/0x53 [ 60.368961][ T7] kasan_report.cold+0xd/0x37 [ 60.373639][ T7] ? afs_wake_up_async_call+0x430/0x4a0 [ 60.379190][ T7] afs_wake_up_async_call+0x430/0x4a0 [ 60.384555][ T7] ? afs_close_socket+0x320/0x320 [ 60.389579][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 60.394689][ T7] ? afs_put_call+0x440/0x440 [ 60.399364][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 60.405777][ T7] rxrpc_call_completed+0xd0/0xf0 [ 60.410797][ T7] rxrpc_discard_prealloc+0x777/0xab0 [ 60.416164][ T7] ? lock_sock_nested+0x94/0x110 [ 60.421100][ T7] rxrpc_listen+0x11c/0x330 [ 60.425602][ T7] afs_close_socket+0x95/0x320 [ 60.430370][ T7] ? afs_purge_servers+0x16d/0x300 [ 60.435741][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 60.441200][ T7] ? init_wait_var_entry+0x200/0x200 [ 60.446484][ T7] ? check_preemption_disabled+0x38/0x220 [ 60.452203][ T7] afs_net_exit+0x1bc/0x310 [ 60.456703][ T7] ? __bpf_trace_afs_cb_miss+0x100/0x100 [ 60.462356][ T7] ops_exit_list+0xb0/0x160 [ 60.466861][ T7] cleanup_net+0x4ea/0xa00 [ 60.471274][ T7] ? __schedule+0x887/0x1eb0 [ 60.475863][ T7] ? ops_free_list.part.0+0x3d0/0x3d0 [ 60.481286][ T7] ? check_preemption_disabled+0x38/0x220 [ 60.487014][ T7] process_one_work+0x94c/0x1670 [ 60.491998][ T7] ? lock_release+0x8d0/0x8d0 [ 60.496762][ T7] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 60.502138][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 60.507080][ T7] worker_thread+0x64c/0x1120 [ 60.511777][ T7] ? process_one_work+0x1670/0x1670 [ 60.516973][ T7] kthread+0x3b5/0x4a0 [ 60.521039][ T7] ? __kthread_bind_mask+0xc0/0xc0 [ 60.526147][ T7] ? __kthread_bind_mask+0xc0/0xc0 [ 60.531260][ T7] ret_from_fork+0x1f/0x30 [ 60.536855][ T7] Kernel Offset: disabled [ 60.541179][ T7] Rebooting in 86400 seconds..