page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1151 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:180 RSP: 0018:ffff88019d5ff308 EFLAGS: 00010202 ------------[ cut here ]------------ RAX: ffffffff8412639b RBX: 0000000000000000 RCX: 00000000000005c0 kernel BUG at lib/list_debug.c:53! RDX: 00000000000005c0 RSI: 0000000020762fff RDI: ffff88014e17d02c invalid opcode: 0000 [#1] SMP PTI RBP: ffff88019d5ff3b0 R08: ffff88019d5ff474 R09: 00000000bae0007a Dumping ftrace buffer: R10: 0000000000000000 R11: ffff88019d5f0000 R12: 0000000000000000 (ftrace buffer empty) R13: 00000000000005c0 R14: 0000000020762fff R15: ffff88014e17d02c Modules linked in: CPU: 0 PID: 10027 Comm: syz-executor4 Not tainted 4.16.0+ #87 csum_and_copy_from_user include/net/checksum.h:34 [inline] csum_and_copy_from_iter_full+0x444/0x1a60 lib/iov_iter.c:1240 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid+0x37c/0x440 lib/list_debug.c:51 RSP: 0018:ffff88014922f1a8 EFLAGS: 00010282 RAX: 0000000000000054 RBX: ffffffffffffffff RCX: 0000000000000000 ip_generic_getfrag+0x1f0/0x3b0 net/ipv4/ip_output.c:837 RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000 RBP: ffff88014922f200 R08: 0000000000000000 R09: 0000000000000001 __ip_append_data+0x3745/0x3d30 net/ipv4/ip_output.c:1018 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88014f867408 R13: 0000000000000000 R14: 00000000e5e00102 R15: 00000000e5e00102 ip_make_skb+0x800/0xe30 net/ipv4/ip_output.c:1481 FS: 00007fb1079dd700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000728010 CR3: 0000000156f5c000 CR4: 00000000001406f0 udp_sendmsg+0x2b41/0x33f0 net/ipv4/udp.c:1039 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __list_del_entry include/linux/list.h:117 [inline] list_del_init include/linux/list.h:159 [inline] tipc_nametbl_unsubscribe+0x4a1/0xa90 net/tipc/name_table.c:848 tipc_subscrb_subscrp_delete+0x399/0x990 net/tipc/subscr.c:212 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764 tipc_subscrb_delete net/tipc/subscr.c:242 [inline] tipc_subscrb_release_cb+0x61/0x100 net/tipc/subscr.c:321 tipc_topsrv_kern_unsubscr+0x54b/0x630 net/tipc/server.c:535 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg net/socket.c:640 [inline] SYSC_sendto+0x6c3/0x7e0 net/socket.c:1747 tipc_group_delete+0x4c8/0x520 net/tipc/group.c:231 SyS_sendto+0x8a/0xb0 net/socket.c:1715 tipc_sk_leave net/tipc/socket.c:2795 [inline] tipc_release+0x215/0x1730 net/tipc/socket.c:577 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 RIP: 0033:0x455979 sock_release net/socket.c:595 [inline] sock_close+0xe0/0x300 net/socket.c:1149 RSP: 002b:00007fc8166c7c68 EFLAGS: 00000246 __fput+0x49e/0xa10 fs/file_table.c:209 ORIG_RAX: 000000000000002c ____fput+0x37/0x40 fs/file_table.c:243 RAX: ffffffffffffffda RBX: 00007fc8166c86d4 RCX: 0000000000455979 RDX: 000000000000fdc7 RSI: 0000000020762fff RDI: 0000000000000014 task_work_run+0x243/0x2c0 kernel/task_work.c:113 RBP: 000000000072bea0 R08: 000000002057bff0 R09: 0000000000000010 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x10e1/0x38d0 kernel/exit.c:867 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000015 R13: 0000000000000545 R14: 00000000006fbf18 R15: 0000000000000003 do_group_exit+0x1a0/0x360 kernel/exit.c:970 get_signal+0x1320/0x1f20 kernel/signal.c:2469 do_signal+0xb8/0x1c80 arch/x86/kernel/signal.c:809 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline] prepare_exit_to_usermode+0x271/0x3a0 arch/x86/entry/common.c:196 syscall_return_slowpath+0xe9/0x700 arch/x86/entry/common.c:265 do_syscall_64+0x36d/0x430 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 RIP: 0033:0x455979 RSP: 002b:00007fb1079dcce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000072bec8 RCX: 0000000000455979 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bec8 RBP: 000000000072bec8 R08: 0000000000000036 R09: 000000000072bea0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000a3e81f R14: 00007fb1079dd9c0 R15: 0000000000000000 Code: 00 48 c7 81 80 0c 00 00 00 00 00 00 c7 81 20 03 00 00 00 00 00 00 48 c7 c7 b5 f7 82 8a 31 c0 48 8b 75 c0 4c 89 e2 e8 a4 a7 51 fd <0f> 0b 66 90 eb fe 44 89 f7 e8 76 83 cb fd e9 88 fd ff ff 48 85 RIP: __list_del_entry_valid+0x37c/0x440 lib/list_debug.c:51 RSP: ffff88014922f1a8 ---[ end trace ef61033e6a0e305d ]---