list_add corruption. next->prev should be prev (ffff88805d9c7ca8), but was ffff8880913cfd80. (next=ffff88808d2d93d8).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:23!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'.
CPU: 1 PID: 6920 Comm: kworker/1:3 Not tainted 4.14.146 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_poll_workfn
task: ffff88805d9ba400 task.stack: ffff88805d9c0000
RIP: 0010:__list_add_valid.cold+0xf/0x3c lib/list_debug.c:23
RSP: 0018:ffff88805d9c7c20 EFLAGS: 00010286
RAX: 0000000000000075 RBX: ffff88805d9c7ca8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff866d10e0 RDI: ffffed100bb38f7a
RBP: ffff88805d9c7c38 R08: 0000000000000075 R09: ffff88805d9bacf0
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808d2d93d8
R13: ffff88805d9c7ca8 R14: ffff88808d2d93b0 R15: ffff88808d2d93d8
FS:  0000000000000000(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4dc7c1c000 CR3: 0000000080786000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_add include/linux/list.h:60 [inline]
 list_add include/linux/list.h:79 [inline]
 list_move include/linux/list.h:171 [inline]
 p9_conn_cancel+0x1e3/0x880 net/9p/trans_fd.c:216
 p9_poll_mux net/9p/trans_fd.c:632 [inline]
 p9_poll_workfn+0x27e/0x3e0 net/9p/trans_fd.c:1123
 process_one_work+0x863/0x1600 kernel/workqueue.c:2114
 worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248
 kthread+0x319/0x430 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: 1d ae fe eb d5 4c 89 e7 e8 0a 1d ae fe eb a3 4c 89 f7 e8 00 1d ae fe 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 
RIP: __list_add_valid.cold+0xf/0x3c lib/list_debug.c:23 RSP: ffff88805d9c7c20
---[ end trace 5073ed828037e0d8 ]---