[ 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 '10.128.0.31' (ECDSA) to the list of known hosts. 2020/06/25 17:16:16 fuzzer started 2020/06/25 17:16:17 connecting to host at 10.128.0.26:35457 2020/06/25 17:16:17 checking machine... 2020/06/25 17:16:17 checking revisions... 2020/06/25 17:16:17 testing simple program... syzkaller login: [ 65.622087][ T6843] IPVS: ftp: loaded support on port[0] = 21 2020/06/25 17:16:17 building call list... [ 65.943102][ T7] tipc: TX() has been purged, node left! [ 66.425215][ T7] ================================================================== [ 66.433466][ T7] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x430/0x4a0 [ 66.441439][ T7] Write of size 1 at addr ffff8880a83441e4 by task kworker/u4:0/7 [ 66.449243][ T7] [ 66.451602][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc2-syzkaller #0 [ 66.459831][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.469888][ T7] Workqueue: netns cleanup_net [ 66.474670][ T7] Call Trace: [ 66.477961][ T7] dump_stack+0x18f/0x20d [ 66.482475][ T7] ? afs_wake_up_async_call+0x430/0x4a0 [ 66.488018][ T7] ? afs_wake_up_async_call+0x430/0x4a0 [ 66.493559][ T7] ? afs_put_call+0x440/0x440 [ 66.498244][ T7] print_address_description.constprop.0.cold+0xae/0x436 [ 66.505273][ T7] ? vprintk_func+0x97/0x1a6 [ 66.509898][ T7] ? afs_wake_up_async_call+0x430/0x4a0 [ 66.515541][ T7] kasan_report.cold+0x1f/0x37 [ 66.520314][ T7] ? afs_wake_up_async_call+0x430/0x4a0 [ 66.525872][ T7] afs_wake_up_async_call+0x430/0x4a0 [ 66.531240][ T7] ? afs_close_socket+0x320/0x320 [ 66.536268][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 66.541387][ T7] ? afs_put_call+0x440/0x440 [ 66.546065][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 66.552573][ T7] rxrpc_call_completed+0xd0/0xf0 [ 66.557605][ T7] rxrpc_discard_prealloc+0x777/0xab0 [ 66.563071][ T7] ? lock_sock_nested+0x94/0x110 [ 66.568127][ T7] rxrpc_listen+0x11c/0x330 [ 66.572636][ T7] afs_close_socket+0x95/0x320 [ 66.577485][ T7] ? afs_purge_servers+0x181/0x330 [ 66.582602][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 66.588065][ T7] ? init_wait_var_entry+0x200/0x200 [ 66.593361][ T7] afs_net_exit+0x1c4/0x310 [ 66.597947][ T7] ? __bpf_trace_afs_cb_miss+0x100/0x100 [ 66.603588][ T7] ops_exit_list+0xb0/0x160 [ 66.608102][ T7] cleanup_net+0x4ea/0xa00 [ 66.612565][ T7] ? __schedule+0x887/0x1eb0 [ 66.617157][ T7] ? ops_free_list.part.0+0x3d0/0x3d0 [ 66.622536][ T7] ? check_preemption_disabled+0x38/0x220 [ 66.628268][ T7] process_one_work+0x94c/0x1670 [ 66.633331][ T7] ? lock_release+0x8d0/0x8d0 [ 66.638097][ T7] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 66.643508][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 66.649244][ T7] worker_thread+0x64c/0x1120 [ 66.653939][ T7] ? process_one_work+0x1670/0x1670 [ 66.659134][ T7] kthread+0x3b5/0x4a0 [ 66.663196][ T7] ? __kthread_bind_mask+0xc0/0xc0 [ 66.668307][ T7] ? __kthread_bind_mask+0xc0/0xc0 [ 66.673429][ T7] ret_from_fork+0x1f/0x30 [ 66.677853][ T7] [ 66.680178][ T7] Allocated by task 6843: [ 66.684515][ T7] save_stack+0x1b/0x40 [ 66.688679][ T7] __kasan_kmalloc.constprop.0+0xc2/0xd0 [ 66.694530][ T7] kmem_cache_alloc_trace+0x14f/0x2d0 [ 66.700429][ T7] afs_alloc_call+0x4f/0x360 [ 66.705068][ T7] afs_charge_preallocation+0xe9/0x2d0 [ 66.710523][ T7] afs_open_socket+0x294/0x360 [ 66.715369][ T7] afs_net_init+0xab4/0xe90 [ 66.719869][ T7] ops_init+0xaf/0x470 [ 66.723962][ T7] setup_net+0x2d8/0x850 [ 66.728203][ T7] copy_net_ns+0x2cf/0x5e0 [ 66.732617][ T7] create_new_namespaces+0x3f6/0xb10 [ 66.737897][ T7] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 66.743785][ T7] ksys_unshare+0x36c/0x9a0 [ 66.748302][ T7] __x64_sys_unshare+0x2d/0x40 [ 66.753167][ T7] do_syscall_64+0x60/0xe0 [ 66.757592][ T7] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.763491][ T7] [ 66.765820][ T7] Freed by task 7: [ 66.769541][ T7] save_stack+0x1b/0x40 [ 66.773701][ T7] __kasan_slab_free+0xf5/0x140 [ 66.778634][ T7] kfree+0x103/0x2c0 [ 66.782611][ T7] afs_put_call+0x345/0x440 [ 66.787117][ T7] rxrpc_discard_prealloc+0x75a/0xab0 [ 66.792488][ T7] rxrpc_listen+0x11c/0x330 [ 66.797014][ T7] afs_close_socket+0x95/0x320 [ 66.802095][ T7] afs_net_exit+0x1c4/0x310 [ 66.806681][ T7] ops_exit_list+0xb0/0x160 [ 66.811179][ T7] cleanup_net+0x4ea/0xa00 [ 66.815592][ T7] process_one_work+0x94c/0x1670 [ 66.820611][ T7] worker_thread+0x64c/0x1120 [ 66.825286][ T7] kthread+0x3b5/0x4a0 [ 66.829441][ T7] ret_from_fork+0x1f/0x30 [ 66.833873][ T7] [ 66.836200][ T7] The buggy address belongs to the object at ffff8880a8344000 [ 66.836200][ T7] which belongs to the cache kmalloc-1k of size 1024 [ 66.850418][ T7] The buggy address is located 484 bytes inside of [ 66.850418][ T7] 1024-byte region [ffff8880a8344000, ffff8880a8344400) [ 66.864471][ T7] The buggy address belongs to the page: [ 66.870187][ T7] page:ffffea0002a0d100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 66.879298][ T7] flags: 0xfffe0000000200(slab) [ 66.884149][ T7] raw: 00fffe0000000200 ffffea000267d2c8 ffffea0002801248 ffff8880aa000c40 [ 66.892919][ T7] raw: 0000000000000000 ffff8880a8344000 0000000100000002 0000000000000000 [ 66.901577][ T7] page dumped because: kasan: bad access detected [ 66.908067][ T7] [ 66.910426][ T7] Memory state around the buggy address: [ 66.916053][ T7] ffff8880a8344080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.924121][ T7] ffff8880a8344100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.932277][ T7] >ffff8880a8344180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.940426][ T7] ^ [ 66.947798][ T7] ffff8880a8344200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.955959][ T7] ffff8880a8344280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.964009][ T7] ================================================================== [ 66.972060][ T7] Disabling lock debugging due to kernel taint [ 66.978265][ T7] Kernel panic - not syncing: panic_on_warn set ... [ 66.984859][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Tainted: G B 5.8.0-rc2-syzkaller #0 [ 66.994565][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.004948][ T7] Workqueue: netns cleanup_net [ 67.009915][ T7] Call Trace: [ 67.013655][ T7] dump_stack+0x18f/0x20d [ 67.018100][ T7] ? afs_wake_up_async_call+0x340/0x4a0 [ 67.023648][ T7] ? afs_put_call+0x440/0x440 [ 67.028333][ T7] panic+0x2e3/0x75c [ 67.032922][ T7] ? __warn_printk+0xf3/0xf3 [ 67.037514][ T7] ? afs_wake_up_async_call+0x430/0x4a0 [ 67.043058][ T7] ? trace_hardirqs_on+0x55/0x220 [ 67.048075][ T7] ? afs_wake_up_async_call+0x430/0x4a0 [ 67.053611][ T7] ? afs_wake_up_async_call+0x430/0x4a0 [ 67.059144][ T7] ? afs_put_call+0x440/0x440 [ 67.063813][ T7] end_report+0x4d/0x53 [ 67.067961][ T7] kasan_report.cold+0xd/0x37 [ 67.072636][ T7] ? afs_wake_up_async_call+0x430/0x4a0 [ 67.078175][ T7] afs_wake_up_async_call+0x430/0x4a0 [ 67.084403][ T7] ? afs_close_socket+0x320/0x320 [ 67.089421][ T7] rxrpc_notify_socket+0x1db/0x5d0 [ 67.094522][ T7] ? afs_put_call+0x440/0x440 [ 67.099193][ T7] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 67.105706][ T7] rxrpc_call_completed+0xd0/0xf0 [ 67.110730][ T7] rxrpc_discard_prealloc+0x777/0xab0 [ 67.116098][ T7] ? lock_sock_nested+0x94/0x110 [ 67.121059][ T7] rxrpc_listen+0x11c/0x330 [ 67.125671][ T7] afs_close_socket+0x95/0x320 [ 67.131122][ T7] ? afs_purge_servers+0x181/0x330 [ 67.136503][ T7] ? afs_rx_discard_new_call+0x50/0x50 [ 67.141953][ T7] ? init_wait_var_entry+0x200/0x200 [ 67.147249][ T7] afs_net_exit+0x1c4/0x310 [ 67.151917][ T7] ? __bpf_trace_afs_cb_miss+0x100/0x100 [ 67.157539][ T7] ops_exit_list+0xb0/0x160 [ 67.162130][ T7] cleanup_net+0x4ea/0xa00 [ 67.166537][ T7] ? __schedule+0x887/0x1eb0 [ 67.171387][ T7] ? ops_free_list.part.0+0x3d0/0x3d0 [ 67.177372][ T7] ? check_preemption_disabled+0x38/0x220 [ 67.183282][ T7] process_one_work+0x94c/0x1670 [ 67.188216][ T7] ? lock_release+0x8d0/0x8d0 [ 67.193121][ T7] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 67.198487][ T7] ? rwlock_bug.part.0+0x90/0x90 [ 67.203449][ T7] worker_thread+0x64c/0x1120 [ 67.208124][ T7] ? process_one_work+0x1670/0x1670 [ 67.213325][ T7] kthread+0x3b5/0x4a0 [ 67.217409][ T7] ? __kthread_bind_mask+0xc0/0xc0 [ 67.222507][ T7] ? __kthread_bind_mask+0xc0/0xc0 [ 67.227613][ T7] ret_from_fork+0x1f/0x30 [ 67.233870][ T7] Kernel Offset: disabled [ 67.238339][ T7] Rebooting in 86400 seconds..