[syzbot] [mm?] general protection fault in swap_reclaim_full_clusters

[syzbot <syzbot+078be8bfa863cb9e0c6b@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    59b723cd2adb Linux 6.12-rc6
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1076c740580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b77c8a55ccf1d9e2
dashboard link: https://syzkaller.appspot.com/bug?extid=078be8bfa863cb9e0c6b
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=167aa1f7980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=110d86a7980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/699c7100a12a/disk-59b723cd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/74524a66d4bc/vmlinux-59b723cd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e81ed2bba0ef/bzImage-59b723cd.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+078be8bfa863cb9e0c6b@syzkaller.appspotmail.com

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 UID: 0 PID: 51 Comm: kworker/1:1 Not tainted 6.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events swap_reclaim_work
RIP: 0010:__list_del_entry_valid_or_report+0x20/0x1c0 lib/list_debug.c:49
Code: 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 fe 48 83 c7 08 48 83 ec 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 19 01 00 00 48 89 f2 48 8b 4e 08 48 b8 00 00 00
RSP: 0018:ffffc90000bb7c30 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff88807b9ae078
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 000000000000004f R12: dffffc0000000000
R13: ffffffffffffffb8 R14: ffff88807b9ae000 R15: ffffc90003af1000
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffaca68fb8 CR3: 00000000791c8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:124 [inline]
 __list_del_entry include/linux/list.h:215 [inline]
 list_move_tail include/linux/list.h:310 [inline]
 swap_reclaim_full_clusters+0x109/0x460 mm/swapfile.c:748
 swap_reclaim_work+0x2e/0x40 mm/swapfile.c:779
 process_one_work+0x958/0x1b30 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0x20/0x1c0 lib/list_debug.c:49
Code: 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 fe 48 83 c7 08 48 83 ec 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 19 01 00 00 48 89 f2 48 8b 4e 08 48 b8 00 00 00
RSP: 0018:ffffc90000bb7c30 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff88807b9ae078
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 000000000000004f R12: dffffc0000000000
R13: ffffffffffffffb8 R14: ffff88807b9ae000 R15: ffffc90003af1000
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffaca68fb8 CR3: 00000000791c8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	90                   	nop
   2:	90                   	nop
   3:	90                   	nop
   4:	90                   	nop
   5:	90                   	nop
   6:	90                   	nop
   7:	90                   	nop
   8:	90                   	nop
   9:	90                   	nop
   a:	f3 0f 1e fa          	endbr64
   e:	48 89 fe             	mov    %rdi,%rsi
  11:	48 83 c7 08          	add    $0x8,%rdi
  15:	48 83 ec 18          	sub    $0x18,%rsp
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 19 01 00 00    	jne    0x14d
  34:	48 89 f2             	mov    %rsi,%rdx
  37:	48 8b 4e 08          	mov    0x8(%rsi),%rcx
  3b:	48                   	rex.W
  3c:	b8                   	.byte 0xb8
  3d:	00 00                	add    %al,(%rax)


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