list_add double add: new=ffff8880a9c7a118, prev=ffff8880a9c7a118, next=ffff888082a3a040. ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:29! invalid opcode: 0000 [#1] PREEMPT SMP KASAN kobject: 'veth34' (ffff8880411789f0): kobject_add_internal: parent: 'net', set: 'devices' Modules linked in: CPU: 1 PID: 31437 Comm: syz-executor.2 Not tainted 4.14.146 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kobject: 'veth34' (ffff8880411789f0): kobject_uevent_env task: ffff88809485c300 task.stack: ffff8880555c0000 RIP: 0010:__list_add_valid.cold+0x26/0x3c lib/list_debug.c:29 RSP: 0018:ffff8880555c7a00 EFLAGS: 00010282 RAX: 0000000000000058 RBX: ffff888082a3a000 RCX: 0000000000000000 kobject: 'veth34' (ffff8880411789f0): fill_kobj_path: path = '/devices/virtual/net/veth34' RDX: 000000000000dd00 RSI: ffffffff814b2e55 RDI: ffffed100aab8f36 RBP: ffff8880555c7a18 R08: 0000000000000058 R09: ffff88809485cbc8 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888082a3a040 R13: ffff8880a9c7a118 R14: ffff8880a9c7a118 R15: ffff8880a9c7a118 FS: 00007f122dc7a700(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffed1833ee8 CR3: 000000005641b000 CR4: 00000000001426e0 kobject: 'queues' (ffff8880a0656b48): kobject_add_internal: parent: 'veth34', set: '' DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_add include/linux/list.h:60 [inline] list_add_tail include/linux/list.h:93 [inline] p9_fd_request+0xe3/0x2b0 net/9p/trans_fd.c:679 kobject: 'queues' (ffff8880a0656b48): kobject_uevent_env p9_client_rpc+0x21b/0x1180 net/9p/client.c:774 kobject: 'queues' (ffff8880a0656b48): kobject_uevent_env: filter function caused the event to drop! p9_client_clunk+0x89/0x150 net/9p/client.c:1507 v9fs_dentry_release+0x6d/0xd0 fs/9p/vfs_dentry.c:73 __dentry_kill+0x39a/0x580 fs/dcache.c:596 dentry_kill fs/dcache.c:632 [inline] dput.part.0+0x59f/0x750 fs/dcache.c:847 kobject: 'rx-0' (ffff888091b67910): kobject_add_internal: parent: 'queues', set: 'queues' dput fs/dcache.c:811 [inline] do_one_tree+0x44/0x50 fs/dcache.c:1507 shrink_dcache_for_umount+0x67/0x140 fs/dcache.c:1521 generic_shutdown_super+0x6d/0x370 fs/super.c:431 kill_anon_super+0x3f/0x60 fs/super.c:1006 v9fs_kill_super+0x3e/0xa0 fs/9p/vfs_super.c:230 deactivate_locked_super+0x74/0xe0 fs/super.c:319 deactivate_super fs/super.c:350 [inline] deactivate_super+0x85/0xa0 fs/super.c:346 cleanup_mnt+0xb2/0x150 fs/namespace.c:1183 __cleanup_mnt+0x16/0x20 fs/namespace.c:1190 task_work_run+0x114/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459a29 RSP: 002b:00007f122dc79c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000459a29 RDX: 0000000000000000 RSI: 000000000000000b RDI: 0000000020000140 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f122dc7a6d4 R13: 00000000004c91e3 R14: 00000000004e0530 R15: 00000000ffffffff Code: e9 56 ff ff ff 4c 89 e1 48 c7 c7 80 30 9d 86 e8 4f a8 72 fe 0f 0b 48 89 f2 4c 89 e1 4c 89 ee 48 c7 c7 c0 31 9d 86 e8 38 a8 72 fe <0f> 0b 48 89 f1 48 c7 c7 40 31 9d 86 4c 89 e6 e8 24 a8 72 fe 0f RIP: __list_add_valid.cold+0x26/0x3c lib/list_debug.c:29 RSP: ffff8880555c7a00 ---[ end trace 738d3b7e715cfce1 ]--- netlink: 1 bytes leftover after parsing attributes in process `syz-executor.4'.