Starting Load/Save RF Kill Switch Status... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.126' (ECDSA) to the list of known hosts. 2020/06/18 09:04:39 fuzzer started 2020/06/18 09:04:39 connecting to host at 10.128.0.26:39471 2020/06/18 09:04:39 checking machine... 2020/06/18 09:04:39 checking revisions... 2020/06/18 09:04:39 testing simple program... syzkaller login: [ 61.630365][ T6825] IPVS: ftp: loaded support on port[0] = 21 2020/06/18 09:04:40 building call list... [ 61.970883][ T26] tipc: TX() has been purged, node left! [ 62.492992][ T26] ================================================================== [ 62.501238][ T26] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 62.509131][ T26] Write of size 1 at addr ffff88809476b1e4 by task kworker/u4:2/26 [ 62.517093][ T26] [ 62.519426][ T26] CPU: 1 PID: 26 Comm: kworker/u4:2 Not tainted 5.8.0-rc1-syzkaller #0 [ 62.527655][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.537713][ T26] Workqueue: netns cleanup_net [ 62.542470][ T26] Call Trace: [ 62.545762][ T26] dump_stack+0x18f/0x20d [ 62.550094][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.555650][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.561189][ T26] ? afs_put_call+0xa40/0xa40 [ 62.565868][ T26] print_address_description.constprop.0.cold+0xd3/0x413 [ 62.572892][ T26] ? vprintk_func+0x97/0x1a6 [ 62.577484][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.583025][ T26] kasan_report.cold+0x1f/0x37 [ 62.587794][ T26] ? rcu_read_lock_held_common+0x51/0xa0 [ 62.593451][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 62.598998][ T26] afs_wake_up_async_call+0x6aa/0x770 [ 62.604382][ T26] ? afs_close_socket+0x320/0x320 [ 62.609495][ T26] ? afs_put_call+0xa40/0xa40 [ 62.614170][ T26] rxrpc_notify_socket+0x1db/0x5d0 [ 62.619290][ T26] ? afs_put_call+0xa40/0xa40 [ 62.623968][ T26] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 62.630388][ T26] rxrpc_call_completed+0xca/0xf0 [ 62.635430][ T26] rxrpc_discard_prealloc+0x781/0xab0 [ 62.641271][ T26] ? lock_sock_nested+0x94/0x110 [ 62.646216][ T26] rxrpc_listen+0x147/0x360 [ 62.650723][ T26] afs_close_socket+0x95/0x320 [ 62.655499][ T26] ? afs_purge_servers+0x16d/0x300 [ 62.661404][ T26] ? afs_rx_discard_new_call+0x50/0x50 [ 62.666868][ T26] ? init_wait_var_entry+0x200/0x200 [ 62.672158][ T26] ? rcu_read_lock_held_common+0xa0/0xa0 [ 62.677879][ T26] ? check_preemption_disabled+0x38/0x220 [ 62.683875][ T26] afs_net_exit+0x1bc/0x310 [ 62.688373][ T26] ? afs_net_init+0xe30/0xe30 [ 62.693169][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 62.698282][ T26] cleanup_net+0x511/0xa50 [ 62.702700][ T26] ? unregister_pernet_device+0x70/0x70 [ 62.708271][ T26] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.714258][ T26] process_one_work+0x965/0x1690 [ 62.719206][ T26] ? lock_release+0x800/0x800 [ 62.723883][ T26] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.729255][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 62.734203][ T26] worker_thread+0x96/0xe10 [ 62.738716][ T26] ? process_one_work+0x1690/0x1690 [ 62.743916][ T26] kthread+0x3b5/0x4a0 [ 62.747983][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.753703][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.759424][ T26] ret_from_fork+0x1f/0x30 [ 62.763846][ T26] [ 62.766175][ T26] Allocated by task 6825: [ 62.770500][ T26] save_stack+0x1b/0x40 [ 62.774740][ T26] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 62.780379][ T26] kmem_cache_alloc_trace+0x153/0x7d0 [ 62.785742][ T26] afs_alloc_call+0x55/0x630 [ 62.790327][ T26] afs_charge_preallocation+0xe9/0x2d0 [ 62.795785][ T26] afs_open_socket+0x292/0x360 [ 62.800579][ T26] afs_net_init+0xa6c/0xe30 [ 62.805092][ T26] ops_init+0xaf/0x420 [ 62.809171][ T26] setup_net+0x2de/0x860 [ 62.813422][ T26] copy_net_ns+0x293/0x590 [ 62.817859][ T26] create_new_namespaces+0x3fb/0xb30 [ 62.823143][ T26] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 62.828776][ T26] ksys_unshare+0x43d/0x8e0 [ 62.833279][ T26] __ia32_sys_unshare+0x2c/0x40 [ 62.838126][ T26] do_syscall_32_irqs_on+0x3f/0x60 [ 62.843242][ T26] do_fast_syscall_32+0x7f/0x120 [ 62.848171][ T26] entry_SYSENTER_compat+0x6d/0x7c [ 62.853267][ T26] [ 62.855611][ T26] Freed by task 26: [ 62.859413][ T26] save_stack+0x1b/0x40 [ 62.863566][ T26] __kasan_slab_free+0xf7/0x140 [ 62.868408][ T26] kfree+0x109/0x2b0 [ 62.872394][ T26] afs_put_call+0x585/0xa40 [ 62.876892][ T26] rxrpc_discard_prealloc+0x764/0xab0 [ 62.882259][ T26] rxrpc_listen+0x147/0x360 [ 62.886755][ T26] afs_close_socket+0x95/0x320 [ 62.891518][ T26] afs_net_exit+0x1bc/0x310 [ 62.896037][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 62.901166][ T26] cleanup_net+0x511/0xa50 [ 62.905589][ T26] process_one_work+0x965/0x1690 [ 62.910519][ T26] worker_thread+0x96/0xe10 [ 62.915190][ T26] kthread+0x3b5/0x4a0 [ 62.919512][ T26] ret_from_fork+0x1f/0x30 [ 62.923914][ T26] [ 62.926236][ T26] The buggy address belongs to the object at ffff88809476b000 [ 62.926236][ T26] which belongs to the cache kmalloc-1k of size 1024 [ 62.941030][ T26] The buggy address is located 484 bytes inside of [ 62.941030][ T26] 1024-byte region [ffff88809476b000, ffff88809476b400) [ 62.954384][ T26] The buggy address belongs to the page: [ 62.960022][ T26] page:ffffea000251dac0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 62.969132][ T26] flags: 0xfffe0000000200(slab) [ 62.973987][ T26] raw: 00fffe0000000200 ffffea000280d2c8 ffffea00024fde88 ffff8880aa000c40 [ 62.982573][ T26] raw: 0000000000000000 ffff88809476b000 0000000100000002 0000000000000000 [ 62.991144][ T26] page dumped because: kasan: bad access detected [ 62.997544][ T26] [ 62.999860][ T26] Memory state around the buggy address: [ 63.005486][ T26] ffff88809476b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.013543][ T26] ffff88809476b100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.021605][ T26] >ffff88809476b180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.029672][ T26] ^ [ 63.036872][ T26] ffff88809476b200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.044931][ T26] ffff88809476b280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.052980][ T26] ================================================================== [ 63.061115][ T26] Disabling lock debugging due to kernel taint [ 63.067333][ T26] Kernel panic - not syncing: panic_on_warn set ... [ 63.073942][ T26] CPU: 1 PID: 26 Comm: kworker/u4:2 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 63.083562][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.093642][ T26] Workqueue: netns cleanup_net [ 63.098395][ T26] Call Trace: [ 63.101699][ T26] dump_stack+0x18f/0x20d [ 63.106050][ T26] ? afs_wake_up_async_call+0x670/0x770 [ 63.111591][ T26] ? afs_put_call+0xa40/0xa40 [ 63.116262][ T26] panic+0x2e3/0x75c [ 63.120242][ T26] ? __warn_printk+0xf3/0xf3 [ 63.124828][ T26] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 63.130982][ T26] ? trace_hardirqs_on+0x55/0x220 [ 63.137221][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.142762][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.148309][ T26] ? afs_put_call+0xa40/0xa40 [ 63.152979][ T26] end_report+0x4d/0x53 [ 63.157129][ T26] kasan_report.cold+0xd/0x37 [ 63.161804][ T26] ? rcu_read_lock_held_common+0x51/0xa0 [ 63.167424][ T26] ? afs_wake_up_async_call+0x6aa/0x770 [ 63.172962][ T26] afs_wake_up_async_call+0x6aa/0x770 [ 63.178329][ T26] ? afs_close_socket+0x320/0x320 [ 63.183341][ T26] ? afs_put_call+0xa40/0xa40 [ 63.188007][ T26] rxrpc_notify_socket+0x1db/0x5d0 [ 63.193115][ T26] ? afs_put_call+0xa40/0xa40 [ 63.197787][ T26] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 63.204195][ T26] rxrpc_call_completed+0xca/0xf0 [ 63.209228][ T26] rxrpc_discard_prealloc+0x781/0xab0 [ 63.214595][ T26] ? lock_sock_nested+0x94/0x110 [ 63.219528][ T26] rxrpc_listen+0x147/0x360 [ 63.224021][ T26] afs_close_socket+0x95/0x320 [ 63.228783][ T26] ? afs_purge_servers+0x16d/0x300 [ 63.233887][ T26] ? afs_rx_discard_new_call+0x50/0x50 [ 63.239340][ T26] ? init_wait_var_entry+0x200/0x200 [ 63.244618][ T26] ? rcu_read_lock_held_common+0xa0/0xa0 [ 63.250242][ T26] ? check_preemption_disabled+0x38/0x220 [ 63.255970][ T26] afs_net_exit+0x1bc/0x310 [ 63.260477][ T26] ? afs_net_init+0xe30/0xe30 [ 63.265244][ T26] ops_exit_list.isra.0+0xa8/0x150 [ 63.270348][ T26] cleanup_net+0x511/0xa50 [ 63.274762][ T26] ? unregister_pernet_device+0x70/0x70 [ 63.280303][ T26] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.286277][ T26] process_one_work+0x965/0x1690 [ 63.291209][ T26] ? lock_release+0x800/0x800 [ 63.295964][ T26] ? pwq_dec_nr_in_flight+0x310/0x310 [ 63.301695][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 63.306667][ T26] worker_thread+0x96/0xe10 [ 63.311170][ T26] ? process_one_work+0x1690/0x1690 [ 63.316363][ T26] kthread+0x3b5/0x4a0 [ 63.320424][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.326136][ T26] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.331850][ T26] ret_from_fork+0x1f/0x30 [ 63.336951][ T26] Kernel Offset: disabled [ 63.341267][ T26] Rebooting in 86400 seconds..