[f2fs-dev] [syzbot] [f2fs?] general protection fault in f2fs_in_warm_node_list

[syzbot <syzbot+6e4cb1cac5efc96ea0ca@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    2961f841b025 Merge tag 'turbostat-2026.02.14' of git://git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12c5db3a580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=65722f41f7edc17e
dashboard link: https://syzkaller.appspot.com/bug?extid=6e4cb1cac5efc96ea0ca
compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17ac695a580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-2961f841.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/19ffd1a88c42/vmlinux-2961f841.xz
kernel image: https://storage.googleapis.com/syzbot-assets/621dc0fadd96/bzImage-2961f841.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/7ce23d543372/mount_5.gz
  fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=110fbeef980000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6e4cb1cac5efc96ea0ca@syzkaller.appspotmail.com

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 0 UID: 0 PID: 1041 Comm: kworker/u4:7 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: loop0 loop_workfn
RIP: 0010:NODE_MAPPING fs/f2fs/f2fs.h:2260 [inline]
RIP: 0010:is_node_folio fs/f2fs/f2fs.h:2270 [inline]
RIP: 0010:f2fs_in_warm_node_list+0xbd/0x290 fs/f2fs/node.c:330
Code: 00 00 4d 03 3c 24 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 61 3b f9 fd 4d 8b 3f 49 83 c7 30 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 44 3b f9 fd 4d 3b 37 74 19 e8 7a
RSP: 0018:ffffc90005347488 EFLAGS: 00010206
RAX: 0000000000000006 RBX: ffffea0001521080 RCX: ffff88803683c900
RDX: 0000000000000000 RSI: ffffea0001521080 RDI: ffff8880546fc000
RBP: ffffea0001521098 R08: ffffffff901194b7 R09: 1ffffffff2023296
R10: dffffc0000000000 R11: fffffbfff2023297 R12: ffff888023ebe638
R13: dffffc0000000000 R14: ffff8880474d9490 R15: 0000000000000030
FS:  0000000000000000(0000) GS:ffff88808ca5b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbdbfabe000 CR3: 0000000056bbf000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 f2fs_write_end_io+0x7ab/0xff0 fs/f2fs/data.c:400
 blk_update_request+0x57e/0xe60 block/blk-mq.c:1016
 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1178
 lo_rw_aio_complete drivers/block/loop.c:337 [inline]
 lo_rw_aio+0xcde/0xf00 drivers/block/loop.c:410
 do_req_filebacked drivers/block/loop.c:434 [inline]
 loop_handle_cmd drivers/block/loop.c:1926 [inline]
 loop_process_work+0x61d/0x11a0 drivers/block/loop.c:1961
 process_one_work kernel/workqueue.c:3275 [inline]
 process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:NODE_MAPPING fs/f2fs/f2fs.h:2260 [inline]
RIP: 0010:is_node_folio fs/f2fs/f2fs.h:2270 [inline]
RIP: 0010:f2fs_in_warm_node_list+0xbd/0x290 fs/f2fs/node.c:330
Code: 00 00 4d 03 3c 24 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 61 3b f9 fd 4d 8b 3f 49 83 c7 30 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 44 3b f9 fd 4d 3b 37 74 19 e8 7a
RSP: 0018:ffffc90005347488 EFLAGS: 00010206
RAX: 0000000000000006 RBX: ffffea0001521080 RCX: ffff88803683c900
RDX: 0000000000000000 RSI: ffffea0001521080 RDI: ffff8880546fc000
RBP: ffffea0001521098 R08: ffffffff901194b7 R09: 1ffffffff2023296
R10: dffffc0000000000 R11: fffffbfff2023297 R12: ffff888023ebe638
R13: dffffc0000000000 R14: ffff8880474d9490 R15: 0000000000000030
FS:  0000000000000000(0000) GS:ffff88808ca5b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbdbf9d3000 CR3: 0000000050969000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	4d 03 3c 24          	add    (%r12),%r15
   6:	4c 89 f8             	mov    %r15,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  12:	74 08                	je     0x1c
  14:	4c 89 ff             	mov    %r15,%rdi
  17:	e8 61 3b f9 fd       	call   0xfdf93b7d
  1c:	4d 8b 3f             	mov    (%r15),%r15
  1f:	49 83 c7 30          	add    $0x30,%r15
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 ff             	mov    %r15,%rdi
  34:	e8 44 3b f9 fd       	call   0xfdf93b7d
  39:	4d 3b 37             	cmp    (%r15),%r14
  3c:	74 19                	je     0x57
  3e:	e8                   	.byte 0xe8
  3f:	7a                   	.byte 0x7a


---
This report is generated by a bot. It may contain errors.
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