[ 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. 2020/06/30 18:46:15 fuzzer started 2020/06/30 18:46:15 connecting to host at 10.128.0.26:36369 2020/06/30 18:46:15 checking machine... 2020/06/30 18:46:15 checking revisions... 2020/06/30 18:46:15 testing simple program... syzkaller login: [ 60.490121][ T6835] IPVS: ftp: loaded support on port[0] = 21 2020/06/30 18:46:16 building call list... [ 60.837517][ T32] tipc: TX() has been purged, node left! [ 61.359776][ T32] ================================================================== [ 61.368017][ T32] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x430/0x4a0 [ 61.375906][ T32] Write of size 1 at addr ffff888082bc89e4 by task kworker/u4:3/32 [ 61.383782][ T32] [ 61.386113][ T32] CPU: 1 PID: 32 Comm: kworker/u4:3 Not tainted 5.8.0-rc1-syzkaller #0 [ 61.394341][ T32] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.404400][ T32] Workqueue: netns cleanup_net [ 61.409156][ T32] Call Trace: [ 61.412444][ T32] dump_stack+0x18f/0x20d [ 61.416777][ T32] ? afs_wake_up_async_call+0x430/0x4a0 [ 61.422318][ T32] ? afs_wake_up_async_call+0x430/0x4a0 [ 61.427859][ T32] ? afs_put_call+0x440/0x440 [ 61.432540][ T32] print_address_description.constprop.0.cold+0xae/0x436 [ 61.439574][ T32] ? vprintk_func+0x97/0x1a6 [ 61.444170][ T32] ? afs_wake_up_async_call+0x430/0x4a0 [ 61.449713][ T32] kasan_report.cold+0x1f/0x37 [ 61.454478][ T32] ? afs_wake_up_async_call+0x430/0x4a0 [ 61.460024][ T32] afs_wake_up_async_call+0x430/0x4a0 [ 61.465392][ T32] ? afs_close_socket+0x320/0x320 [ 61.470420][ T32] rxrpc_notify_socket+0x1db/0x5d0 [ 61.475549][ T32] ? afs_put_call+0x440/0x440 [ 61.480240][ T32] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 61.486663][ T32] rxrpc_call_completed+0xd0/0xf0 [ 61.491692][ T32] rxrpc_discard_prealloc+0x777/0xab0 [ 61.497066][ T32] ? lock_sock_nested+0x94/0x110 [ 61.502008][ T32] rxrpc_listen+0x11c/0x330 [ 61.506519][ T32] afs_close_socket+0x95/0x320 [ 61.511281][ T32] ? afs_purge_servers+0x16d/0x300 [ 61.516397][ T32] ? afs_rx_discard_new_call+0x50/0x50 [ 61.521866][ T32] ? init_wait_var_entry+0x200/0x200 [ 61.527157][ T32] ? check_preemption_disabled+0x38/0x220 [ 61.532877][ T32] afs_net_exit+0x1bc/0x310 [ 61.537395][ T32] ? __bpf_trace_afs_cb_miss+0x100/0x100 [ 61.543023][ T32] ops_exit_list+0xb0/0x160 [ 61.547533][ T32] cleanup_net+0x4ea/0xa00 [ 61.551945][ T32] ? __schedule+0x887/0x1eb0 [ 61.556536][ T32] ? ops_free_list.part.0+0x3d0/0x3d0 [ 61.561915][ T32] ? check_preemption_disabled+0x38/0x220 [ 61.567641][ T32] process_one_work+0x94c/0x1670 [ 61.572592][ T32] ? lock_release+0x8d0/0x8d0 [ 61.577265][ T32] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 61.582642][ T32] ? rwlock_bug.part.0+0x90/0x90 [ 61.587593][ T32] worker_thread+0x64c/0x1120 [ 61.592314][ T32] ? process_one_work+0x1670/0x1670 [ 61.597597][ T32] kthread+0x3b5/0x4a0 [ 61.601666][ T32] ? __kthread_bind_mask+0xc0/0xc0 [ 61.606799][ T32] ? __kthread_bind_mask+0xc0/0xc0 [ 61.611923][ T32] ret_from_fork+0x1f/0x30 [ 61.616351][ T32] [ 61.618675][ T32] Allocated by task 6835: [ 61.623005][ T32] save_stack+0x1b/0x40 [ 61.627156][ T32] __kasan_kmalloc.constprop.0+0xc2/0xd0 [ 61.632784][ T32] kmem_cache_alloc_trace+0x14f/0x2d0 [ 61.638242][ T32] afs_alloc_call+0x4f/0x360 [ 61.642827][ T32] afs_charge_preallocation+0xe9/0x2d0 [ 61.648281][ T32] afs_open_socket+0x294/0x360 [ 61.653041][ T32] afs_net_init+0xa6c/0xe30 [ 61.657561][ T32] ops_init+0xaf/0x470 [ 61.661634][ T32] setup_net+0x2d8/0x850 [ 61.665879][ T32] copy_net_ns+0x2cf/0x5e0 [ 61.670314][ T32] create_new_namespaces+0x3f6/0xb10 [ 61.675623][ T32] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 61.681294][ T32] ksys_unshare+0x36c/0x9a0 [ 61.685814][ T32] __x64_sys_unshare+0x2d/0x40 [ 61.690588][ T32] do_syscall_64+0x60/0xe0 [ 61.696489][ T32] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.702367][ T32] [ 61.704686][ T32] Freed by task 32: [ 61.708586][ T32] save_stack+0x1b/0x40 [ 61.712737][ T32] __kasan_slab_free+0xf5/0x140 [ 61.717582][ T32] kfree+0x103/0x2c0 [ 61.721484][ T32] afs_put_call+0x345/0x440 [ 61.726255][ T32] rxrpc_discard_prealloc+0x75a/0xab0 [ 61.731635][ T32] rxrpc_listen+0x11c/0x330 [ 61.736140][ T32] afs_close_socket+0x95/0x320 [ 61.740918][ T32] afs_net_exit+0x1bc/0x310 [ 61.745735][ T32] ops_exit_list+0xb0/0x160 [ 61.750338][ T32] cleanup_net+0x4ea/0xa00 [ 61.755093][ T32] process_one_work+0x94c/0x1670 [ 61.760029][ T32] worker_thread+0x64c/0x1120 [ 61.764736][ T32] kthread+0x3b5/0x4a0 [ 61.769266][ T32] ret_from_fork+0x1f/0x30 [ 61.773689][ T32] [ 61.776021][ T32] The buggy address belongs to the object at ffff888082bc8800 [ 61.776021][ T32] which belongs to the cache kmalloc-1k of size 1024 [ 61.790518][ T32] The buggy address is located 484 bytes inside of [ 61.790518][ T32] 1024-byte region [ffff888082bc8800, ffff888082bc8c00) [ 61.804398][ T32] The buggy address belongs to the page: [ 61.810730][ T32] page:ffffea00020af200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 61.819932][ T32] flags: 0xfffe0000000200(slab) [ 61.825121][ T32] raw: 00fffe0000000200 ffffea00020af188 ffffea00020af288 ffff8880aa000c40 [ 61.833742][ T32] raw: 0000000000000000 ffff888082bc8000 0000000100000002 0000000000000000 [ 61.844581][ T32] page dumped because: kasan: bad access detected [ 61.850991][ T32] [ 61.853401][ T32] Memory state around the buggy address: [ 61.859033][ T32] ffff888082bc8880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.867100][ T32] ffff888082bc8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.875160][ T32] >ffff888082bc8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.883217][ T32] ^ [ 61.890411][ T32] ffff888082bc8a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.898473][ T32] ffff888082bc8a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 61.906533][ T32] ================================================================== [ 61.914587][ T32] Disabling lock debugging due to kernel taint [ 61.920816][ T32] Kernel panic - not syncing: panic_on_warn set ... [ 61.927501][ T32] CPU: 1 PID: 32 Comm: kworker/u4:3 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 61.937127][ T32] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.947191][ T32] Workqueue: netns cleanup_net [ 61.951948][ T32] Call Trace: [ 61.955241][ T32] dump_stack+0x18f/0x20d [ 61.959577][ T32] ? afs_wake_up_async_call+0x3a0/0x4a0 [ 61.965204][ T32] ? afs_put_call+0x440/0x440 [ 61.969879][ T32] panic+0x2e3/0x75c [ 61.973776][ T32] ? __warn_printk+0xf3/0xf3 [ 61.978367][ T32] ? afs_wake_up_async_call+0x430/0x4a0 [ 61.983911][ T32] ? trace_hardirqs_on+0x55/0x220 [ 61.988935][ T32] ? afs_wake_up_async_call+0x430/0x4a0 [ 61.994469][ T32] ? afs_wake_up_async_call+0x430/0x4a0 [ 62.000009][ T32] ? afs_put_call+0x440/0x440 [ 62.004715][ T32] end_report+0x4d/0x53 [ 62.008882][ T32] kasan_report.cold+0xd/0x37 [ 62.013640][ T32] ? afs_wake_up_async_call+0x430/0x4a0 [ 62.019180][ T32] afs_wake_up_async_call+0x430/0x4a0 [ 62.024545][ T32] ? afs_close_socket+0x320/0x320 [ 62.029650][ T32] rxrpc_notify_socket+0x1db/0x5d0 [ 62.034755][ T32] ? afs_put_call+0x440/0x440 [ 62.039440][ T32] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.045849][ T32] rxrpc_call_completed+0xd0/0xf0 [ 62.050867][ T32] rxrpc_discard_prealloc+0x777/0xab0 [ 62.056233][ T32] ? lock_sock_nested+0x94/0x110 [ 62.061167][ T32] rxrpc_listen+0x11c/0x330 [ 62.065662][ T32] afs_close_socket+0x95/0x320 [ 62.070789][ T32] ? afs_purge_servers+0x16d/0x300 [ 62.075894][ T32] ? afs_rx_discard_new_call+0x50/0x50 [ 62.081347][ T32] ? init_wait_var_entry+0x200/0x200 [ 62.086629][ T32] ? check_preemption_disabled+0x38/0x220 [ 62.092342][ T32] afs_net_exit+0x1bc/0x310 [ 62.096838][ T32] ? __bpf_trace_afs_cb_miss+0x100/0x100 [ 62.102463][ T32] ops_exit_list+0xb0/0x160 [ 62.106964][ T32] cleanup_net+0x4ea/0xa00 [ 62.111371][ T32] ? __schedule+0x887/0x1eb0 [ 62.115958][ T32] ? ops_free_list.part.0+0x3d0/0x3d0 [ 62.121322][ T32] ? check_preemption_disabled+0x38/0x220 [ 62.127034][ T32] process_one_work+0x94c/0x1670 [ 62.131969][ T32] ? lock_release+0x8d0/0x8d0 [ 62.136643][ T32] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 62.142012][ T32] ? rwlock_bug.part.0+0x90/0x90 [ 62.146951][ T32] worker_thread+0x64c/0x1120 [ 62.151630][ T32] ? process_one_work+0x1670/0x1670 [ 62.156820][ T32] kthread+0x3b5/0x4a0 [ 62.160883][ T32] ? __kthread_bind_mask+0xc0/0xc0 [ 62.169201][ T32] ? __kthread_bind_mask+0xc0/0xc0 [ 62.174312][ T32] ret_from_fork+0x1f/0x30 [ 62.180147][ T32] Kernel Offset: disabled [ 62.184563][ T32] Rebooting in 86400 seconds..