Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 312 Comm: syz-executor613 Not tainted syzkaller #0 e678fb639bf2314ecbc0d819b692701f82417ebd
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:vsscanf+0x18c/0x24b0 lib/vsprintf.c:3444
Code: 48 c7 c6 b0 b5 e3 87 e8 22 43 e6 fb 41 83 fe 25 74 4d 45 85 f6 0f 84 a4 21 00 00 48 ff c3 48 89 5c 24 58 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 8e 1b 00 00 41 0f b6 1f 45 0f b6 f6 44
RSP: 0018:ffffc900011df5a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff86364b61 RCX: 0000000000000001
RDX: ffffffff85a1341e RSI: ffffffff87e3b5b0 RDI: 0000000000000030
RBP: ffffc900011df6b0 R08: ffff88812fb02600 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000000 R12: ffffffff86364b60
R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000
FS:  000055555ba6b3c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000103790000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 sscanf+0xe3/0x150 lib/vsprintf.c:3700
 split_huge_pages_write+0x3c7/0x1220 mm/huge_memory.c:4134
 full_proxy_write+0x125/0x1e0 fs/debugfs/file.c:328
 vfs_write+0x3c1/0xfd0 fs/read_write.c:682
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f75bf330ef9
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc39f98468 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000200000000300 RCX: 00007f75bf330ef9
RDX: 000000000000002f RSI: 0000000000000000 RDI: 000000000000002e
RBP: 0000200000000000 R08: 0000000000000008 R09: 00007ffc39f985a8
R10: 0000000000000008 R11: 0000000000000246 R12: 0067756265642f2e
R13: 0000000000000002 R14: 00007f75bf3c1ca0 R15: 0000000000000002
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vsscanf+0x18c/0x24b0 lib/vsprintf.c:3444
Code: 48 c7 c6 b0 b5 e3 87 e8 22 43 e6 fb 41 83 fe 25 74 4d 45 85 f6 0f 84 a4 21 00 00 48 ff c3 48 89 5c 24 58 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 8e 1b 00 00 41 0f b6 1f 45 0f b6 f6 44
RSP: 0018:ffffc900011df5a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff86364b61 RCX: 0000000000000001
RDX: ffffffff85a1341e RSI: ffffffff87e3b5b0 RDI: 0000000000000030
RBP: ffffc900011df6b0 R08: ffff88812fb02600 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000000 R12: ffffffff86364b60
R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000
FS:  000055555ba6b3c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000103790000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
   0:	48 c7 c6 b0 b5 e3 87 	mov    $0xffffffff87e3b5b0,%rsi
   7:	e8 22 43 e6 fb       	call   0xfbe6432e
   c:	41 83 fe 25          	cmp    $0x25,%r14d
  10:	74 4d                	je     0x5f
  12:	45 85 f6             	test   %r14d,%r14d
  15:	0f 84 a4 21 00 00    	je     0x21bf
  1b:	48 ff c3             	inc    %rbx
  1e:	48 89 5c 24 58       	mov    %rbx,0x58(%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 8e 1b 00 00    	jne    0x1bc5
  37:	41 0f b6 1f          	movzbl (%r15),%ebx
  3b:	45 0f b6 f6          	movzbl %r14b,%r14d
  3f:	44                   	rex.R