general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 5312 Comm: syz.1.1344 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:vsscanf+0x196/0x24b0 lib/vsprintf.c:3446
Code: 48 c7 c6 90 02 8e 87 e8 48 9e 7e fc 41 83 fe 25 74 4d 45 85 f6 0f 84 b6 21 00 00 48 ff c3 48 89 5c 24 78 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 4f 1b 00 00 41 0f b6 1f 45 0f b6 f6 44
RSP: 0018:ffffc900012375e0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff85b0d901 RCX: 0000000000000001
RDX: ffffffff84f2cd48 RSI: ffffffff878e0290 RDI: 0000000000000030
RBP: ffffc90001237710 R08: ffff88811aa5e540 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000002 R12: ffffffff85b0d900
R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000
FS:  00007fd3949936c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd394992ff8 CR3: 0000000145f10000 CR4: 00000000003506b0
Call Trace:
 <TASK>
 sscanf+0xdf/0x130 lib/vsprintf.c:3704
 split_huge_pages_write+0x37a/0x10d0 mm/huge_memory.c:3286
 full_proxy_write+0x121/0x1d0 fs/debugfs/file.c:244
 vfs_write+0x3fb/0xd00 fs/read_write.c:582
 ksys_write+0x14a/0x260 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:646
 x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd393b9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd394993028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd393e26180 RCX: 00007fd393b9e0d9
RDX: 00000000000000e7 RSI: 00002000000001c0 RDI: 0000000000000003
RBP: 00007fd393c35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd393e26218 R14: 00007fd393e26180 R15: 00007ffe65590a88
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vsscanf+0x196/0x24b0 lib/vsprintf.c:3446
Code: 48 c7 c6 90 02 8e 87 e8 48 9e 7e fc 41 83 fe 25 74 4d 45 85 f6 0f 84 b6 21 00 00 48 ff c3 48 89 5c 24 78 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 4f 1b 00 00 41 0f b6 1f 45 0f b6 f6 44
RSP: 0018:ffffc900012375e0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff85b0d901 RCX: 0000000000000001
RDX: ffffffff84f2cd48 RSI: ffffffff878e0290 RDI: 0000000000000030
RBP: ffffc90001237710 R08: ffff88811aa5e540 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000002 R12: ffffffff85b0d900
R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000
FS:  00007fd3949936c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561efa9a5af8 CR3: 0000000145f10000 CR4: 00000000003506b0
----------------
Code disassembly (best guess):
   0:	48 c7 c6 90 02 8e 87 	mov    $0xffffffff878e0290,%rsi
   7:	e8 48 9e 7e fc       	call   0xfc7e9e54
   c:	41 83 fe 25          	cmp    $0x25,%r14d
  10:	74 4d                	je     0x5f
  12:	45 85 f6             	test   %r14d,%r14d
  15:	0f 84 b6 21 00 00    	je     0x21d1
  1b:	48 ff c3             	inc    %rbx
  1e:	48 89 5c 24 78       	mov    %rbx,0x78(%rsp)
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 4f 1b 00 00    	jne    0x1b86
  37:	41 0f b6 1f          	movzbl (%r15),%ebx
  3b:	45 0f b6 f6          	movzbl %r14b,%r14d
  3f:	44                   	rex.R