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: 30478 Comm: syz.7.5623 Not tainted 6.13.0-rc3-syzkaller-00209-g499551201b5f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:vsscanf+0x1a4/0x2a30 lib/vsprintf.c:3466 Code: db 74 5e e8 1e 8b 82 f6 49 8d 5d 01 48 89 e9 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 48 89 5c 24 70 49 89 dc 41 0f b6 45 00 <0f> b6 14 11 48 89 e9 83 e1 07 38 ca 7f 08 84 d2 0f 85 1e 19 00 00 RSP: 0018:ffffc90004c6f668 EFLAGS: 00010246 RAX: 0000000000000030 RBX: ffffffff8b5c8d01 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffffffff8b16c3d2 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000030 R11: 0000000000000000 R12: ffffffff8b5c8d01 R13: ffffffff8b5c8d00 R14: dffffc0000000000 R15: ffffc90004c6feb0 FS: 00007f52aaa0e6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd7d2f77bac CR3: 0000000089e36000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> sscanf+0xc8/0x100 lib/vsprintf.c:3722 split_huge_pages_write+0xa16/0x1f60 mm/huge_memory.c:4178 full_proxy_write+0xfb/0x1b0 fs/debugfs/file.c:356 vfs_write+0x24c/0x1150 fs/read_write.c:677 ksys_write+0x12b/0x250 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f52a9b85d29 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f52aaa0e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f52a9d75fa0 RCX: 00007f52a9b85d29 RDX: 0000000000000401 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00007f52a9c01aa8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f52a9d75fa0 R15: 00007ffca0dfd5f8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:vsscanf+0x1a4/0x2a30 lib/vsprintf.c:3466 Code: db 74 5e e8 1e 8b 82 f6 49 8d 5d 01 48 89 e9 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 48 89 5c 24 70 49 89 dc 41 0f b6 45 00 <0f> b6 14 11 48 89 e9 83 e1 07 38 ca 7f 08 84 d2 0f 85 1e 19 00 00 RSP: 0018:ffffc90004c6f668 EFLAGS: 00010246 RAX: 0000000000000030 RBX: ffffffff8b5c8d01 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffffffff8b16c3d2 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000030 R11: 0000000000000000 R12: ffffffff8b5c8d01 R13: ffffffff8b5c8d00 R14: dffffc0000000000 R15: ffffc90004c6feb0 FS: 00007f52aaa0e6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8b41d452d8 CR3: 0000000089e36000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 74 5e je 0x60 2: e8 1e 8b 82 f6 call 0xf6828b25 7: 49 8d 5d 01 lea 0x1(%r13),%rbx b: 48 89 e9 mov %rbp,%rcx e: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 15: fc ff df 18: 48 c1 e9 03 shr $0x3,%rcx 1c: 48 89 5c 24 70 mov %rbx,0x70(%rsp) 21: 49 89 dc mov %rbx,%r12 24: 41 0f b6 45 00 movzbl 0x0(%r13),%eax * 29: 0f b6 14 11 movzbl (%rcx,%rdx,1),%edx <-- trapping instruction 2d: 48 89 e9 mov %rbp,%rcx 30: 83 e1 07 and $0x7,%ecx 33: 38 ca cmp %cl,%dl 35: 7f 08 jg 0x3f 37: 84 d2 test %dl,%dl 39: 0f 85 1e 19 00 00 jne 0x195d