list_add corruption. next->prev should be prev (ffffe8ffac339070), but was ffffffff84658750. (next=ffff888022350d00).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:29!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 1135 Comm: kworker/u32:6 Not tainted 6.13.0-syzkaller-05154-g8883957b3c9d #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: zswap1 compact_page_work
RIP: 0010:__list_add_valid_or_report+0xa9/0x100 lib/list_debug.c:29
Code: 68 d2 8b e8 29 09 d7 fc 90 0f 0b 48 c7 c7 20 69 d2 8b e8 1a 09 d7 fc 90 0f 0b 48 89 d9 48 c7 c7 80 69 d2 8b e8 08 09 d7 fc 90 <0f> 0b 48 89 f1 48 c7 c7 00 6a d2 8b 48 89 de e8 f3 08 d7 fc 90 0f
RSP: 0018:ffffc90006c67b98 EFLAGS: 00010286
RAX: 0000000000000075 RBX: ffff888022350d00 RCX: ffffffff8178e769
RDX: 0000000000000000 RSI: ffffffff81794723 RDI: 0000000000000005
RBP: ffff8880223a9000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000004 R12: 0000000000000001
R13: ffff8880223a9008 R14: ffff8880223a9000 R15: ffffea000088ea40
FS:  0000000000000000(0000) GS:ffff88802b500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f5045510 CR3: 000000002b20e000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 __list_add_valid include/linux/list.h:88 [inline]
 __list_add include/linux/list.h:150 [inline]
 list_add include/linux/list.h:169 [inline]
 add_to_unbuddied mm/z3fold.c:550 [inline]
 do_compact_page+0x10b9/0x25d0 mm/z3fold.c:772
 process_one_work+0x958/0x1b30 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3317 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:

---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid_or_report+0xa9/0x100 lib/list_debug.c:29
Code: 68 d2 8b e8 29 09 d7 fc 90 0f 0b 48 c7 c7 20 69 d2 8b e8 1a 09 d7 fc 90 0f 0b 48 89 d9 48 c7 c7 80 69 d2 8b e8 08 09 d7 fc 90 <0f> 0b 48 89 f1 48 c7 c7 00 6a d2 8b 48 89 de e8 f3 08 d7 fc 90 0f
RSP: 0018:ffffc90006c67b98 EFLAGS: 00010286

RAX: 0000000000000075 RBX: ffff888022350d00 RCX: ffffffff8178e769
RDX: 0000000000000000 RSI: ffffffff81794723 RDI: 0000000000000005
RBP: ffff8880223a9000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000004 R12: 0000000000000001
R13: ffff8880223a9008 R14: ffff8880223a9000 R15: ffffea000088ea40
FS:  0000000000000000(0000) GS:ffff88802b500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f5045510 CR3: 000000002b20e000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600