[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.667328] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 19.278654] random: sshd: uninitialized urandom read (32 bytes read) [ 19.712899] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.494743] random: sshd: uninitialized urandom read (32 bytes read) [ 20.663272] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. [ 26.106682] random: sshd: uninitialized urandom read (32 bytes read) [ 26.213241] IPVS: ftp: loaded support on port[0] = 21 [ 26.227929] IPVS: ftp: loaded support on port[0] = 21 [ 26.232437] IPVS: ftp: loaded support on port[0] = 21 [ 26.233785] IPVS: ftp: loaded support on port[0] = 21 [ 26.238857] IPVS: ftp: loaded support on port[0] = 21 [ 26.244173] IPVS: ftp: loaded support on port[0] = 21 [ 26.249484] IPVS: ftp: loaded support on port[0] = 21 [ 26.254432] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 40.010225] ================================================================== [ 40.017757] BUG: KASAN: use-after-free in bpf_tcp_close+0xd7f/0xf80 [ 40.024161] Read of size 8 at addr ffff8801bfac2710 by task syz-executor342/8900 [ 40.031681] [ 40.033307] CPU: 0 PID: 8900 Comm: syz-executor342 Not tainted 4.17.0-rc6+ #26 [ 40.040659] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.050001] Call Trace: [ 40.052596] dump_stack+0x1b9/0x294 executing program executing program executing program [ 40.056234] ? dump_stack_print_info.cold.2+0x52/0x52 [ 40.061424] ? printk+0x9e/0xba [ 40.064702] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 40.069461] ? kasan_check_write+0x14/0x20 [ 40.073698] print_address_description+0x6c/0x20b [ 40.078548] ? bpf_tcp_close+0xd7f/0xf80 [ 40.082605] kasan_report.cold.7+0x242/0x2fe [ 40.087026] __asan_report_load8_noabort+0x14/0x20 [ 40.091964] bpf_tcp_close+0xd7f/0xf80 [ 40.095862] ? tcp_check_oom+0x520/0x520 [ 40.099931] ? lock_downgrade+0x8e0/0x8e0 [ 40.104089] ? sock_hash_free+0x6e0/0x6e0 executing program executing program executing program executing program executing program [ 40.108250] ? kasan_check_read+0x11/0x20 [ 40.112409] ? rcu_is_watching+0x85/0x140 [ 40.116573] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 40.121780] ? kasan_check_read+0x11/0x20 [ 40.125931] ? rcu_is_watching+0x85/0x140 [ 40.130093] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.135640] ? ipv6_sock_ac_close+0x34e/0x480 [ 40.140151] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 40.145707] ? ipv6_sock_mc_close+0x161/0x1c0 [ 40.150215] ? ip_mc_drop_socket+0x20f/0x270 [ 40.154644] inet_release+0x104/0x1f0 executing program executing program executing program [ 40.158455] inet6_release+0x50/0x70 [ 40.162180] sock_release+0x96/0x1b0 [ 40.165899] ? sock_alloc_file+0x4e0/0x4e0 [ 40.170138] sock_close+0x16/0x20 [ 40.173617] __fput+0x34d/0x890 [ 40.176907] ? fput+0x1a0/0x1a0 [ 40.180194] ? check_same_owner+0x320/0x320 [ 40.184520] ? _raw_spin_unlock_irq+0x27/0x70 [ 40.189027] ____fput+0x15/0x20 [ 40.192316] task_work_run+0x1e4/0x290 [ 40.196211] ? task_work_cancel+0x240/0x240 [ 40.200545] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 40.206102] ? switch_task_namespaces+0xa2/0xd0 executing program executing program executing program executing program [ 40.210782] do_exit+0x1aee/0x2730 [ 40.214335] ? mm_update_next_owner+0x980/0x980 [ 40.219015] ? lock_downgrade+0x8e0/0x8e0 [ 40.223176] ? kasan_check_read+0x11/0x20 [ 40.227332] ? rcu_is_watching+0x85/0x140 [ 40.231491] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 40.236692] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 40.241897] ? is_bpf_text_address+0xd7/0x170 [ 40.246407] ? kernel_text_address+0x79/0xf0 [ 40.250825] ? __unwind_start+0x166/0x330 [ 40.254977] ? __kernel_text_address+0xd/0x40 executing program executing program executing program executing program [ 40.259839] ? unwind_get_return_address+0x61/0xa0 [ 40.264790] ? save_stack+0xa9/0xd0 [ 40.268433] ? save_stack+0x43/0xd0 [ 40.272060] ? __kasan_slab_free+0x11a/0x170 [ 40.276474] ? kasan_slab_free+0xe/0x10 [ 40.280449] ? kfree+0xd9/0x260 [ 40.283736] ? map_update_elem+0x642/0xc90 [ 40.287999] ? __x64_sys_bpf+0x32d/0x510 [ 40.292149] ? do_syscall_64+0x1b1/0x800 [ 40.296213] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.301582] ? kasan_check_read+0x11/0x20 [ 40.305739] ? do_raw_spin_unlock+0x9e/0x2e0 executing program executing program executing program executing program [ 40.310161] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 40.314752] ? kasan_check_write+0x14/0x20 [ 40.319018] ? do_raw_spin_lock+0xc1/0x200 [ 40.323257] ? trace_hardirqs_off+0xd/0x10 [ 40.327493] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 40.332609] ? debug_check_no_obj_freed+0x2ff/0x584 [ 40.337634] ? kasan_check_read+0x11/0x20 [ 40.341785] ? rcu_is_watching+0x85/0x140 [ 40.345944] ? rcu_pm_notify+0xc0/0xc0 [ 40.349835] ? trace_hardirqs_off+0xd/0x10 [ 40.354085] ? map_update_elem+0x650/0xc90 executing program executing program executing program executing program [ 40.358324] ? rcu_read_lock_sched_held+0x108/0x120 [ 40.363344] ? kfree+0x1e9/0x260 [ 40.366728] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.372268] ? map_update_elem+0x127/0xc90 [ 40.376513] do_group_exit+0x16f/0x430 [ 40.380413] ? bpf_prog_get+0x20/0x20 [ 40.384222] ? __ia32_sys_exit+0x50/0x50 [ 40.388291] ? do_syscall_64+0x92/0x800 [ 40.392273] __x64_sys_exit_group+0x3e/0x50 [ 40.396605] do_syscall_64+0x1b1/0x800 [ 40.400501] ? syscall_return_slowpath+0x5c0/0x5c0 [ 40.405447] ? syscall_return_slowpath+0x30f/0x5c0 executing program executing program executing program executing program [ 40.410385] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 40.415762] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.420626] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.425903] RIP: 0033:0x4417d9 [ 40.429093] RSP: 002b:00007ffc141bd208 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 40.436804] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004417d9 [ 40.444076] RDX: 00000000004417d9 RSI: 0000000000000014 RDI: 0000000000000000 [ 40.451349] RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000006cd448 executing program executing program executing program executing program [ 40.458623] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000009bee [ 40.465901] R13: 00000000006cd448 R14: 0000000000000000 R15: 0000000000000000 [ 40.473180] [ 40.474808] Allocated by task 8900: [ 40.478442] save_stack+0x43/0xd0 [ 40.481902] kasan_kmalloc+0xc4/0xe0 [ 40.485620] __kmalloc_node+0x47/0x70 [ 40.489422] sock_hash_ctx_update_elem.isra.23+0xa57/0x1560 [ 40.495137] sock_hash_update_elem+0x14f/0x2d0 [ 40.499727] map_update_elem+0x5c4/0xc90 [ 40.503796] __x64_sys_bpf+0x32d/0x510 [ 40.507689] do_syscall_64+0x1b1/0x800 executing program executing program executing program executing program [ 40.511585] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.516767] [ 40.518391] Freed by task 5972: [ 40.521680] save_stack+0x43/0xd0 [ 40.525133] __kasan_slab_free+0x11a/0x170 [ 40.529372] kasan_slab_free+0xe/0x10 [ 40.533177] kfree+0xd9/0x260 [ 40.536287] sock_hash_free+0x24e/0x6e0 [ 40.540264] bpf_map_free_deferred+0xba/0xf0 [ 40.544681] process_one_work+0xc1e/0x1b50 [ 40.548922] worker_thread+0x1cc/0x1440 [ 40.552896] kthread+0x345/0x410 [ 40.556266] ret_from_fork+0x3a/0x50 [ 40.559973] executing program executing program executing program executing program executing program [ 40.561602] The buggy address belongs to the object at ffff8801bfac2700 [ 40.561602] which belongs to the cache kmalloc-64 of size 64 [ 40.574093] The buggy address is located 16 bytes inside of [ 40.574093] 64-byte region [ffff8801bfac2700, ffff8801bfac2740) [ 40.585794] The buggy address belongs to the page: [ 40.590728] page:ffffea0006feb080 count:1 mapcount:0 mapping:ffff8801bfac2000 index:0x0 [ 40.598878] flags: 0x2fffc0000000100(slab) [ 40.603129] raw: 02fffc0000000100 ffff8801bfac2000 0000000000000000 0000000100000020 executing program executing program executing program executing program [ 40.611023] raw: ffffea00070d5260 ffffea000723b0e0 ffff8801da800340 0000000000000000 [ 40.618903] page dumped because: kasan: bad access detected [ 40.624609] [ 40.626230] Memory state around the buggy address: [ 40.631161] ffff8801bfac2600: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 40.638529] ffff8801bfac2680: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc [ 40.645894] >ffff8801bfac2700: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 40.653253] ^ executing program executing program executing program executing program executing program [ 40.657142] ffff8801bfac2780: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc [ 40.664506] ffff8801bfac2800: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc [ 40.671869] ================================================================== [ 40.679220] Disabling lock debugging due to kernel taint [ 40.684721] Kernel panic - not syncing: panic_on_warn set ... [ 40.684721] [ 40.692089] CPU: 0 PID: 8900 Comm: syz-executor342 Tainted: G B 4.17.0-rc6+ #26 [ 40.700918] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.710288] Call Trace: executing program executing program executing program executing program executing program executing program [ 40.712880] dump_stack+0x1b9/0x294 [ 40.716516] ? dump_stack_print_info.cold.2+0x52/0x52 [ 40.721715] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 40.726476] ? bpf_tcp_close+0xcf0/0xf80 [ 40.730553] panic+0x22f/0x4de [ 40.733749] ? add_taint.cold.5+0x16/0x16 [ 40.737909] ? do_raw_spin_unlock+0x9e/0x2e0 [ 40.742329] ? do_raw_spin_unlock+0x9e/0x2e0 [ 40.746740] ? bpf_tcp_close+0xd7f/0xf80 [ 40.750801] kasan_end_report+0x47/0x4f [ 40.754949] kasan_report.cold.7+0x76/0x2fe executing program executing program executing program executing program executing program executing program [ 40.759278] __asan_report_load8_noabort+0x14/0x20 [ 40.764209] bpf_tcp_close+0xd7f/0xf80 [ 40.768106] ? tcp_check_oom+0x520/0x520 [ 40.772168] ? lock_downgrade+0x8e0/0x8e0 [ 40.776323] ? sock_hash_free+0x6e0/0x6e0 [ 40.780485] ? kasan_check_read+0x11/0x20 [ 40.784639] ? rcu_is_watching+0x85/0x140 [ 40.788791] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 40.793987] ? kasan_check_read+0x11/0x20 [ 40.798132] ? rcu_is_watching+0x85/0x140 [ 40.802372] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.807924] ? ipv6_sock_ac_close+0x34e/0x480 executing program executing program executing program executing program executing program executing program [ 40.812424] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 40.817970] ? ipv6_sock_mc_close+0x161/0x1c0 [ 40.822476] ? ip_mc_drop_socket+0x20f/0x270 [ 40.826887] inet_release+0x104/0x1f0 [ 40.830689] inet6_release+0x50/0x70 [ 40.834400] sock_release+0x96/0x1b0 [ 40.838114] ? sock_alloc_file+0x4e0/0x4e0 [ 40.842345] sock_close+0x16/0x20 [ 40.845797] __fput+0x34d/0x890 [ 40.849080] ? fput+0x1a0/0x1a0 [ 40.852365] ? check_same_owner+0x320/0x320 [ 40.856691] ? _raw_spin_unlock_irq+0x27/0x70 executing program executing program executing program executing program executing program executing program [ 40.861184] ____fput+0x15/0x20 [ 40.864464] task_work_run+0x1e4/0x290 [ 40.868530] ? task_work_cancel+0x240/0x240 [ 40.872859] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 40.878399] ? switch_task_namespaces+0xa2/0xd0 [ 40.883077] do_exit+0x1aee/0x2730 [ 40.886622] ? mm_update_next_owner+0x980/0x980 [ 40.891290] ? lock_downgrade+0x8e0/0x8e0 [ 40.895440] ? kasan_check_read+0x11/0x20 [ 40.899587] ? rcu_is_watching+0x85/0x140 [ 40.903736] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 40.908929] ? rcu_bh_force_quiescent_state+0x20/0x20 executing program executing program executing program executing program executing program executing program [ 40.914124] ? is_bpf_text_address+0xd7/0x170 [ 40.918618] ? kernel_text_address+0x79/0xf0 [ 40.923025] ? __unwind_start+0x166/0x330 [ 40.927173] ? __kernel_text_address+0xd/0x40 [ 40.931669] ? unwind_get_return_address+0x61/0xa0 [ 40.936612] ? save_stack+0xa9/0xd0 [ 40.940245] ? save_stack+0x43/0xd0 [ 40.943874] ? __kasan_slab_free+0x11a/0x170 [ 40.948281] ? kasan_slab_free+0xe/0x10 [ 40.952348] ? kfree+0xd9/0x260 [ 40.955638] ? map_update_elem+0x642/0xc90 [ 40.959872] ? __x64_sys_bpf+0x32d/0x510 executing program executing program executing program executing program executing program executing program executing program [ 40.963937] ? do_syscall_64+0x1b1/0x800 [ 40.967998] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.973370] ? kasan_check_read+0x11/0x20 [ 40.977529] ? do_raw_spin_unlock+0x9e/0x2e0 [ 40.981938] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 40.986527] ? kasan_check_write+0x14/0x20 [ 40.990765] ? do_raw_spin_lock+0xc1/0x200 [ 40.995018] ? trace_hardirqs_off+0xd/0x10 [ 40.999267] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 41.004386] ? debug_check_no_obj_freed+0x2ff/0x584 [ 41.009410] ? kasan_check_read+0x11/0x20 executing program executing program executing program executing program executing program executing program executing program [ 41.013560] ? rcu_is_watching+0x85/0x140 [ 41.017710] ? rcu_pm_notify+0xc0/0xc0 [ 41.021595] ? trace_hardirqs_off+0xd/0x10 [ 41.025840] ? map_update_elem+0x650/0xc90 [ 41.030074] ? rcu_read_lock_sched_held+0x108/0x120 [ 41.035092] ? kfree+0x1e9/0x260 [ 41.038474] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.044008] ? map_update_elem+0x127/0xc90 [ 41.048245] do_group_exit+0x16f/0x430 [ 41.052145] ? bpf_prog_get+0x20/0x20 [ 41.055949] ? __ia32_sys_exit+0x50/0x50 [ 41.060011] ? do_syscall_64+0x92/0x800 executing program executing program [ 41.0639