Warning: Permanently added '10.128.0.133' (ECDSA) to the list of known hosts. [* ] A start job is running for dev-ttyS0.device (8s / 1min 30s) [** ] A start job is running for dev-ttyS0.device (9s / 1min 30s) [*** ] A start job is running for dev-ttyS0.device (10s / 1min 30s) [ *** ] A start job is running for dev-ttyS0.device (10s / 1min 30s) [ *** ] A start job is running for dev-ttyS0.device (11s / 1min 30s) [ ***] A start job is running for dev-ttyS0.device (11s / 1min 30s) [ **] A start job is running for dev-ttyS0.device (12s / 1min 30s) [ *] A start job is running for dev-ttyS0.device (13s / 1min 30s) [ **] A start job is running for dev-ttyS0.device (13s / 1min 30s) [ ***] A start job is running for dev-ttyS0.device (14s / 1min 30s) [ *** ] A start job is running for dev-ttyS0.device (15s / 1min 30s) [ *** ] A start job is running for dev-ttyS0.device (15s / 1min 30s) [*** ] A start job is running for dev-ttyS0.device (16s / 1min 30s) [** ] A start job is running for dev-ttyS0.device (16s / 1min 30s)[ 24.012794][ T402] cgroup1: Unknown subsys name 'perf_event' [ 24.015151][ T400] cgroup1: Unknown subsys name 'perf_event' [ 24.019471][ T402] cgroup1: Unknown subsys name 'net_cls' [ 24.030865][ T406] cgroup1: Unknown subsys name 'perf_event' [ 24.032887][ T403] cgroup1: Unknown subsys name 'perf_event' [ 24.037521][ T400] cgroup1: Unknown subsys name 'net_cls' [ 24.043579][ T404] cgroup1: Unknown subsys name 'perf_event' [ 24.052201][ T406] cgroup1: Unknown subsys name 'net_cls' [ 24.056355][ T405] cgroup1: Unknown subsys name 'perf_event' [ 24.063630][ T403] cgroup1: Unknown subsys name 'net_cls' [ 24.066678][ T405] cgroup1: Unknown subsys name 'net_cls' [ 24.072560][ T404] cgroup1: Unknown subsys name 'net_cls' executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [* ] A start job is running for dev-ttyS0.device (17s / 1min 30s) [** ] A start job is running for dev-ttyS0.device (18s / 1min 30s) [*** ] A start job is running for dev-ttyS0.device (18s / 1min 30s) [ *** ] A start job is running for dev-ttyS0.device (19s / 1min 30s) [ *** ] A start job is running for dev-ttyS0.device (20s / 1min 30s) [ ***] A start job is running for dev-ttyS0.device (20s / 1min 30s) [ **] A start job is running for dev-ttyS0.device (21s / 1min 30s) [ *] A start job is running for dev-ttyS0.device (21s / 1min 30s) [ **] A start job is running for dev-ttyS0.device (22s / 1min 30s) [ ***] A start job is running for dev-ttyS0.device (23s / 1min 30s)[ 29.738959][ T2993] ================================================================== [ 29.747129][ T2993] BUG: KASAN: use-after-free in free_netdev+0x176/0x300 [ 29.754044][ T2993] Read of size 8 at addr ffff8881d4926530 by task syz-executor991/2993 [ 29.762250][ T2993] [ 29.764643][ T2993] CPU: 0 PID: 2993 Comm: syz-executor991 Not tainted 5.4.31-syzkaller-00073-gfa41ab5369c7 #0 [ 29.774761][ T2993] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.784791][ T2993] Call Trace: [ 29.788102][ T2993] dump_stack+0x14a/0x1ce [ 29.792411][ T2993] ? show_regs_print_info+0x12/0x12 [ 29.797592][ T2993] ? printk+0xd2/0x114 [ 29.801640][ T2993] print_address_description+0x93/0x620 [ 29.807162][ T2993] ? slab_free_freelist_hook+0xd0/0x140 [ 29.812717][ T2993] ? call_rcu+0x10/0x10 [ 29.816861][ T2993] __kasan_report+0x16d/0x1e0 [ 29.821526][ T2993] ? free_netdev+0x176/0x300 [ 29.826095][ T2993] kasan_report+0x34/0x60 [ 29.830436][ T2993] free_netdev+0x176/0x300 [ 29.834831][ T2993] netdev_run_todo+0xc38/0xe90 [ 29.839578][ T2993] ? netdev_refcnt_read+0x1a0/0x1a0 [ 29.844754][ T2993] ? mutex_trylock+0xb0/0xb0 [ 29.849321][ T2993] rtnetlink_rcv_msg+0x9a0/0xc60 [ 29.854235][ T2993] ? rtnetlink_bind+0x80/0x80 [ 29.858901][ T2993] ? unwind_get_return_address+0x48/0x90 [ 29.864513][ T2993] ? arch_stack_walk+0xd8/0x120 [ 29.869368][ T2993] ? stack_trace_save+0x123/0x1f0 [ 29.874393][ T2993] ? stack_trace_snprint+0x150/0x150 [ 29.879669][ T2993] ? rhashtable_jhash2+0x1cf/0x2f0 [ 29.884755][ T2993] ? jhash+0x740/0x740 [ 29.890548][ T2993] ? rht_key_hashfn+0x157/0x240 [ 29.895384][ T2993] ? deferred_put_nlk_sk+0x210/0x210 [ 29.900642][ T2993] ? jhash+0x740/0x740 [ 29.904685][ T2993] ? netlink_hash+0xd0/0xd0 [ 29.909182][ T2993] ? __sys_sendmsg+0x2d5/0x3c0 [ 29.913935][ T2993] ? do_syscall_64+0xcb/0x150 [ 29.918982][ T2993] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 29.925076][ T2993] ? __rcu_read_lock+0x50/0x50 [ 29.929882][ T2993] netlink_rcv_skb+0x200/0x480 [ 29.934640][ T2993] ? rtnetlink_bind+0x80/0x80 [ 29.939316][ T2993] ? netlink_ack+0xa90/0xa90 [ 29.943937][ T2993] ? __rcu_read_lock+0x50/0x50 [ 29.948677][ T2993] ? selinux_vm_enough_memory+0x170/0x170 [ 29.954459][ T2993] ? netlink_trim+0x10a/0x230 [ 29.959118][ T2993] netlink_unicast+0x8ad/0xa50 [ 29.963856][ T2993] ? netlink_detachskb+0x60/0x60 [ 29.968768][ T2993] ? __virt_addr_valid+0x1fd/0x290 [ 29.973852][ T2993] netlink_sendmsg+0x9de/0xd80 [ 29.978590][ T2993] ? netlink_getsockopt+0x8e0/0x8e0 [ 29.983847][ T2993] ? import_iovec+0x1c2/0x380 [ 29.988503][ T2993] ? security_socket_sendmsg+0xad/0xc0 [ 29.993933][ T2993] ? netlink_getsockopt+0x8e0/0x8e0 [ 29.999111][ T2993] ____sys_sendmsg+0x58a/0x8d0 [ 30.003850][ T2993] ? __sys_sendmsg_sock+0x2b0/0x2b0 [ 30.009023][ T2993] ? selinux_file_alloc_security+0x19/0x120 [ 30.014904][ T2993] __sys_sendmsg+0x2d5/0x3c0 [ 30.019467][ T2993] ? ____sys_sendmsg+0x8d0/0x8d0 [ 30.024388][ T2993] ? fput_many+0x42/0x1a0 [ 30.028707][ T2993] do_syscall_64+0xcb/0x150 [ 30.033184][ T2993] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 30.039068][ T2993] RIP: 0033:0x44aa09 [ 30.042935][ T2993] Code: e8 7c e6 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 1b 05 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 30.062528][ T2993] RSP: 002b:00007f8d7a517ce8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 30.070932][ T2993] RAX: ffffffffffffffda RBX: 00000000006e1c68 RCX: 000000000044aa09 [ 30.078878][ T2993] RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000005 [ 30.086835][ T2993] RBP: 00000000006e1c60 R08: 0000000000000000 R09: 0000000000000000 [ 30.094779][ T2993] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006e1c6c [ 30.102739][ T2993] R13: 00007ffc9daa868f R14: 00007f8d7a5189c0 R15: 0000000000000000 [ 30.110705][ T2993] [ 30.113008][ T2993] Allocated by task 2993: [ 30.117320][ T2993] __kasan_kmalloc+0x12c/0x1c0 [ 30.122056][ T2993] __kmalloc+0xf7/0x2c0 [ 30.126184][ T2993] sk_prot_alloc+0xd6/0x290 [ 30.130674][ T2993] sk_alloc+0x2e/0x2e0 [ 30.134715][ T2993] tun_chr_open+0x77/0x490 [ 30.139150][ T2993] misc_open+0x356/0x3d0 [ 30.143370][ T2993] chrdev_open+0x585/0x640 [ 30.147782][ T2993] do_dentry_open+0x8f7/0x1070 [ 30.152553][ T2993] path_openat+0x12db/0x3d10 [ 30.157114][ T2993] do_filp_open+0x20d/0x440 [ 30.161622][ T2993] do_sys_open+0x387/0x7d0 [ 30.166029][ T2993] do_syscall_64+0xcb/0x150 [ 30.170535][ T2993] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 30.176409][ T2993] [ 30.178712][ T2993] Freed by task 2992: [ 30.182750][ T2993] __kasan_slab_free+0x181/0x230 [ 30.187720][ T2993] slab_free_freelist_hook+0xd0/0x140 [ 30.193090][ T2993] kfree+0x12b/0x5f0 [ 30.196962][ T2993] __sk_destruct+0x3f9/0x480 [ 30.201526][ T2993] tun_chr_close+0xb4/0xd0 [ 30.206005][ T2993] __fput+0x27d/0x6c0 [ 30.209972][ T2993] task_work_run+0x176/0x1a0 [ 30.214587][ T2993] prepare_exit_to_usermode+0x286/0x2e0 [ 30.220144][ T2993] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 30.226008][ T2993] [ 30.228315][ T2993] The buggy address belongs to the object at ffff8881d4926000 [ 30.228315][ T2993] which belongs to the cache kmalloc-2k of size 2048 [ 30.242440][ T2993] The buggy address is located 1328 bytes inside of [ 30.242440][ T2993] 2048-byte region [ffff8881d4926000, ffff8881d4926800) [ 30.255867][ T2993] The buggy address belongs to the page: [ 30.261493][ T2993] page:ffffea0007524800 refcount:1 mapcount:0 mapping:ffff8881da802800 index:0x0 compound_mapcount: 0 [ 30.272416][ T2993] flags: 0x8000000000010200(slab|head) [ 30.277869][ T2993] raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881da802800 [ 30.286438][ T2993] raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 [ 30.295013][ T2993] page dumped because: kasan: bad access detected [ 30.301408][ T2993] [ 30.303722][ T2993] Memory state around the buggy address: [ 30.303730][ T2993] ffff8881d4926400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.303736][ T2993] ffff8881d4926480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.303741][ T2993] >ffff8881d4926500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.303751][ T2993] ^ executing program executing program executing program [ 30.339105][ T2993] ffff8881d4926580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.347154][ T2993] ffff8881d4926600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.355239][ T2993] ================================================================== [ 30.363382][ T2993] Disabling lock debugging due to kernel taint executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program