Oops: general protection fault, probably [  576.911321][    C1] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 1 UID: 0 PID: 57 Comm: kworker/u8:3 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: ipv6_addrconf addrconf_dad_work
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 91 04 fd 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 74 04 fd fd 4d 3b 37 74 19 e8 aa
RSP: 0018:ffffc9000123f588 EFLAGS: 00010206
RAX: 0000000000000006 RBX: ffffea0000a52c40 RCX: ffff88801a76db80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100
RBP: ffffea0000a52c58 R08: ffff88803184bd2b R09: 1ffff110063097a5
R10: dffffc0000000000 R11: ffffed10063097a6 R12: ffff88803330e798
R13: dffffc0000000000 R14: ffff88806025bcd0 R15: 0000000000000030
FS:  0000000000000000(0000) GS:ffff888126438000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2a548e5d58 CR3: 000000005e35a000 CR4: 00000000003526f0
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
 blk_flush_complete_seq+0x687/0xce0 block/blk-flush.c:191
 flush_end_io+0xc40/0xf30 block/blk-flush.c:251
 __blk_mq_end_request+0x4a9/0x680 block/blk-mq.c:1168
 blk_complete_reqs block/blk-mq.c:1253 [inline]
 blk_done_softirq+0x10a/0x160 block/blk-mq.c:1258
 handle_softirqs+0x1de/0x6f0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 __local_bh_enable_ip+0x170/0x2b0 kernel/softirq.c:302
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 spin_unlock_bh include/linux/spinlock_rt.h:116 [inline]
 addrconf_dad_work+0x3ca/0x1680 net/ipv6/addrconf.c:4228
 process_one_work kernel/workqueue.c:3276 [inline]
 process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
 kthread+0x388/0x470 kernel/kthread.c:436
 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 91 04 fd 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 74 04 fd fd 4d 3b 37 74 19 e8 aa
RSP: 0018:ffffc9000123f588 EFLAGS: 00010206
RAX: 0000000000000006 RBX: ffffea0000a52c40 RCX: ffff88801a76db80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100
RBP: ffffea0000a52c58 R08: ffff88803184bd2b R09: 1ffff110063097a5
R10: dffffc0000000000 R11: ffffed10063097a6 R12: ffff88803330e798
R13: dffffc0000000000 R14: ffff88806025bcd0 R15: 0000000000000030
FS:  0000000000000000(0000) GS:ffff888126438000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2a548e5d58 CR3: 0000000037e12000 CR4: 00000000003526f0
----------------
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 91 04 fd fd       	call   0xfdfd04ad
  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 74 04 fd fd       	call   0xfdfd04ad
  39:	4d 3b 37             	cmp    (%r15),%r14
  3c:	74 19                	je     0x57
  3e:	e8                   	.byte 0xe8
  3f:	aa                   	stos   %al,%es:(%rdi)