[ 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 '10.128.0.220' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 78.169834][ T29] audit: type=1400 audit(1594956706.839:8): avc: denied { execmem } for pid=6811 comm="syz-executor433" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 89.611885][ T9398] ================================================================== [ 89.620152][ T9398] BUG: KASAN: use-after-free in sock_def_write_space+0x609/0x630 [ 89.627871][ T9398] Read of size 8 at addr ffff888082ebf5c0 by task syz-executor433/9398 [ 89.636096][ T9398] [ 89.638411][ T9398] CPU: 1 PID: 9398 Comm: syz-executor433 Not tainted 5.8.0-rc5-syzkaller #0 [ 89.647067][ T9398] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 89.657323][ T9398] Call Trace: [ 89.660626][ T9398] dump_stack+0x18f/0x20d [ 89.664998][ T9398] ? sock_def_write_space+0x609/0x630 [ 89.670384][ T9398] ? sock_def_write_space+0x609/0x630 [ 89.675769][ T9398] print_address_description.constprop.0.cold+0xae/0x436 [ 89.682916][ T9398] ? lockdep_hardirqs_off+0x66/0xa0 [ 89.688102][ T9398] ? vprintk_func+0x97/0x1a6 [ 89.692702][ T9398] ? sock_def_write_space+0x609/0x630 [ 89.698065][ T9398] kasan_report.cold+0x1f/0x37 [ 89.702815][ T9398] ? sock_def_write_space+0x609/0x630 [ 89.708192][ T9398] sock_def_write_space+0x609/0x630 [ 89.713741][ T9398] ? kfree_skb+0x7d/0x100 [ 89.718061][ T9398] ? qrtr_tun_poll+0xf0/0xf0 [ 89.722649][ T9398] sock_wfree+0x1cc/0x240 [ 89.726982][ T9398] ? __sk_receive_skb+0x830/0x830 [ 89.732026][ T9398] skb_release_head_state+0x9f/0x250 [ 89.737309][ T9398] kfree_skb.part.0+0x89/0x350 [ 89.742067][ T9398] kfree_skb+0x7d/0x100 [ 89.746204][ T9398] skb_queue_purge+0x14/0x30 [ 89.750779][ T9398] qrtr_tun_release+0x40/0x60 [ 89.755445][ T9398] __fput+0x33c/0x880 [ 89.759411][ T9398] task_work_run+0xdd/0x190 [ 89.763909][ T9398] do_exit+0xb72/0x2a40 [ 89.768053][ T9398] ? lock_acquire+0x1f1/0xad0 [ 89.772722][ T9398] ? find_held_lock+0x2d/0x110 [ 89.777468][ T9398] ? mm_update_next_owner+0x7a0/0x7a0 [ 89.782830][ T9398] ? get_signal+0x332/0x1ee0 [ 89.787450][ T9398] ? lock_downgrade+0x820/0x820 [ 89.792283][ T9398] ? lock_is_held_type+0xb0/0xe0 [ 89.797218][ T9398] do_group_exit+0x125/0x310 [ 89.801810][ T9398] get_signal+0x40b/0x1ee0 [ 89.806209][ T9398] ? futex_exit_release+0x220/0x220 [ 89.811388][ T9398] ? rwlock_bug.part.0+0x90/0x90 [ 89.816308][ T9398] ? __local_bh_enable_ip+0x159/0x250 [ 89.821946][ T9398] ? trace_hardirqs_on+0x5f/0x220 [ 89.826979][ T9398] do_signal+0x82/0x2520 [ 89.831222][ T9398] ? qrtr_sendmsg+0x8a0/0x8a0 [ 89.835890][ T9398] ? fput_many+0x2f/0x1a0 [ 89.840211][ T9398] ? copy_siginfo_to_user32+0xa0/0xa0 [ 89.845572][ T9398] ? __x64_sys_futex+0x378/0x4e0 [ 89.850488][ T9398] ? __x64_sys_futex+0x382/0x4e0 [ 89.855407][ T9398] ? do_futex+0x1a60/0x1a60 [ 89.859891][ T9398] ? __prepare_exit_to_usermode+0xcc/0x1f0 [ 89.865681][ T9398] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 89.871646][ T9398] __prepare_exit_to_usermode+0x156/0x1f0 [ 89.877349][ T9398] do_syscall_64+0x6c/0xe0 [ 89.881756][ T9398] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 89.887651][ T9398] RIP: 0033:0x4469f9 [ 89.891547][ T9398] Code: Bad RIP value. [ 89.895709][ T9398] RSP: 002b:00007f220f53ad98 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 89.904220][ T9398] RAX: fffffffffffffe00 RBX: 00000000006dbc48 RCX: 00000000004469f9 [ 89.912174][ T9398] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc48 [ 89.920133][ T9398] RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000 [ 89.928085][ T9398] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc4c [ 89.936039][ T9398] R13: 0000000000000000 R14: 0000000000000000 R15: 00306974765f7069 [ 89.944117][ T9398] [ 89.946435][ T9398] Allocated by task 9397: [ 89.950843][ T9398] save_stack+0x1b/0x40 [ 89.955073][ T9398] __kasan_kmalloc.constprop.0+0xc2/0xd0 [ 89.960730][ T9398] kmem_cache_alloc+0x12c/0x3b0 [ 89.965574][ T9398] sock_alloc_inode+0x18/0x1c0 [ 89.970316][ T9398] alloc_inode+0x61/0x230 [ 89.974619][ T9398] new_inode_pseudo+0x14/0xe0 [ 89.979283][ T9398] sock_alloc+0x3c/0x260 [ 89.983513][ T9398] __sock_create+0xb9/0x740 [ 89.987990][ T9398] __sys_socket+0xef/0x200 [ 89.992382][ T9398] __x64_sys_socket+0x6f/0xb0 [ 89.997044][ T9398] do_syscall_64+0x60/0xe0 [ 90.001453][ T9398] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 90.007329][ T9398] [ 90.009644][ T9398] Freed by task 16: [ 90.013454][ T9398] save_stack+0x1b/0x40 [ 90.017599][ T9398] __kasan_slab_free+0xf5/0x140 [ 90.022654][ T9398] kmem_cache_free+0x7f/0x310 [ 90.027329][ T9398] i_callback+0x3f/0x70 [ 90.031472][ T9398] rcu_core+0x5c7/0x1160 [ 90.035695][ T9398] __do_softirq+0x34c/0xa60 [ 90.040169][ T9398] [ 90.042479][ T9398] The buggy address belongs to the object at ffff888082ebf540 [ 90.042479][ T9398] which belongs to the cache sock_inode_cache of size 1216 [ 90.057038][ T9398] The buggy address is located 128 bytes inside of [ 90.057038][ T9398] 1216-byte region [ffff888082ebf540, ffff888082ebfa00) [ 90.070387][ T9398] The buggy address belongs to the page: [ 90.076025][ T9398] page:ffffea00020bafc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888082ebfffd [ 90.086524][ T9398] flags: 0xfffe0000000200(slab) [ 90.091358][ T9398] raw: 00fffe0000000200 ffffea00020bb808 ffffea00020bb088 ffff88821b098000 [ 90.099921][ T9398] raw: ffff888082ebfffd ffff888082ebf000 0000000100000003 0000000000000000 [ 90.108479][ T9398] page dumped because: kasan: bad access detected [ 90.114865][ T9398] [ 90.117167][ T9398] Memory state around the buggy address: [ 90.122784][ T9398] ffff888082ebf480: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc [ 90.130822][ T9398] ffff888082ebf500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 90.138861][ T9398] >ffff888082ebf580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 90.146896][ T9398] ^ [ 90.153024][ T9398] ffff888082ebf600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb executing program executing program [ 90.161066][ T9398] ffff888082ebf680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 90.169099][ T9398] ================================================================== [ 90.177149][ T9398] Disabling lock debugging due to kernel taint [ 90.185916][ T9398] Kernel panic - not syncing: panic_on_warn set ... [ 90.192523][ T9398] CPU: 1 PID: 9398 Comm: syz-executor433 Tainted: G B 5.8.0-rc5-syzkaller #0 [ 90.202581][ T9398] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 90.212814][ T9398] Call Trace: [ 90.216101][ T9398] dump_stack+0x18f/0x20d [ 90.220432][ T9398] ? sock_def_write_space+0x5c0/0x630 [ 90.225804][ T9398] panic+0x2e3/0x75c [ 90.229692][ T9398] ? __warn_printk+0xf3/0xf3 [ 90.234265][ T9398] ? preempt_schedule_common+0x59/0xc0 [ 90.239698][ T9398] ? sock_def_write_space+0x609/0x630 [ 90.245065][ T9398] ? preempt_schedule_thunk+0x16/0x18 [ 90.250467][ T9398] ? trace_hardirqs_on+0x55/0x220 [ 90.255613][ T9398] ? sock_def_write_space+0x609/0x630 executing program [ 90.260971][ T9398] ? sock_def_write_space+0x609/0x630 [ 90.266361][ T9398] end_report+0x4d/0x53 [ 90.270501][ T9398] kasan_report.cold+0xd/0x37 [ 90.275155][ T9398] ? sock_def_write_space+0x609/0x630 [ 90.280500][ T9398] sock_def_write_space+0x609/0x630 [ 90.285678][ T9398] ? kfree_skb+0x7d/0x100 [ 90.290059][ T9398] ? qrtr_tun_poll+0xf0/0xf0 [ 90.294642][ T9398] sock_wfree+0x1cc/0x240 [ 90.298970][ T9398] ? __sk_receive_skb+0x830/0x830 [ 90.303980][ T9398] skb_release_head_state+0x9f/0x250 [ 90.309348][ T9398] kfree_skb.part.0+0x89/0x350 [ 90.314104][ T9398] kfree_skb+0x7d/0x100 [ 90.318323][ T9398] skb_queue_purge+0x14/0x30 [ 90.322896][ T9398] qrtr_tun_release+0x40/0x60 [ 90.327736][ T9398] __fput+0x33c/0x880 [ 90.331701][ T9398] task_work_run+0xdd/0x190 [ 90.336285][ T9398] do_exit+0xb72/0x2a40 [ 90.340507][ T9398] ? lock_acquire+0x1f1/0xad0 [ 90.345180][ T9398] ? find_held_lock+0x2d/0x110 [ 90.349919][ T9398] ? mm_update_next_owner+0x7a0/0x7a0 [ 90.355385][ T9398] ? get_signal+0x332/0x1ee0 [ 90.359959][ T9398] ? lock_downgrade+0x820/0x820 [ 90.364793][ T9398] ? lock_is_held_type+0xb0/0xe0 [ 90.369703][ T9398] do_group_exit+0x125/0x310 [ 90.374270][ T9398] get_signal+0x40b/0x1ee0 [ 90.378663][ T9398] ? futex_exit_release+0x220/0x220 [ 90.383853][ T9398] ? rwlock_bug.part.0+0x90/0x90 [ 90.388781][ T9398] ? __local_bh_enable_ip+0x159/0x250 [ 90.394411][ T9398] ? trace_hardirqs_on+0x5f/0x220 [ 90.399454][ T9398] do_signal+0x82/0x2520 [ 90.403700][ T9398] ? qrtr_sendmsg+0x8a0/0x8a0 [ 90.408366][ T9398] ? fput_many+0x2f/0x1a0 [ 90.412674][ T9398] ? copy_siginfo_to_user32+0xa0/0xa0 [ 90.418144][ T9398] ? __x64_sys_futex+0x378/0x4e0 [ 90.423056][ T9398] ? __x64_sys_futex+0x382/0x4e0 [ 90.427973][ T9398] ? do_futex+0x1a60/0x1a60 [ 90.432457][ T9398] ? __prepare_exit_to_usermode+0xcc/0x1f0 [ 90.438296][ T9398] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 90.444257][ T9398] __prepare_exit_to_usermode+0x156/0x1f0 [ 90.449964][ T9398] do_syscall_64+0x6c/0xe0 [ 90.454406][ T9398] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 90.460282][ T9398] RIP: 0033:0x4469f9 [ 90.464244][ T9398] Code: Bad RIP value. [ 90.468288][ T9398] RSP: 002b:00007f220f53ad98 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 90.476675][ T9398] RAX: fffffffffffffe00 RBX: 00000000006dbc48 RCX: 00000000004469f9 [ 90.484641][ T9398] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc48 [ 90.492695][ T9398] RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000 [ 90.500878][ T9398] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc4c [ 90.508829][ T9398] R13: 0000000000000000 R14: 0000000000000000 R15: 00306974765f7069 [ 90.518287][ T9398] Kernel Offset: disabled [ 90.522612][ T9398] Rebooting in 86400 seconds..