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: 0 UID: 0 PID: 794 Comm: syz.0.168 Not tainted syzkaller #0 851f5cb62ab9f9c24538876695daf6a72142c571 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:ffffc9000eba75a0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffffff863647e1 RCX: 0000000000000001 RDX: ffffffff85a1341e RSI: ffffffff87e3b5b0 RDI: 0000000000000030 RBP: ffffc9000eba76b0 R08: ffff88810c313900 R09: 0000000000000002 R10: 0000000000000025 R11: 0000000000000002 R12: ffffffff863647e0 R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000 FS: 00007f09f0aad6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c31430a CR3: 000000010dbd8000 CR4: 00000000003526b0 Call Trace: 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: 0033:0x7f09efb9e0d9 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:00007f09f0aad028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f09efe25fa0 RCX: 00007f09efb9e0d9 RDX: 0000000000000002 RSI: 0000200000000600 RDI: 0000000000000003 RBP: 00007f09efc35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f09efe26038 R14: 00007f09efe25fa0 R15: 00007ffcb14b4ad8 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:ffffc9000eba75a0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffffff863647e1 RCX: 0000000000000001 RDX: ffffffff85a1341e RSI: ffffffff87e3b5b0 RDI: 0000000000000030 RBP: ffffc9000eba76b0 R08: ffff88810c313900 R09: 0000000000000002 R10: 0000000000000025 R11: 0000000000000002 R12: ffffffff863647e0 R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000 FS: 00007f09f0aad6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f09efbeb7c0 CR3: 000000010dbd8000 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