(syz.9.1374,12090,3):dlmfs_mkdir:420 ERROR: invalid domain name for directory.
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 59d9f067 P4D 59d9f067 PUD 499c1067 PMD 0 
Oops: Oops: 0010 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 12090 Comm: syz.9.1374 Not tainted 6.12.0-rc6-syzkaller-00272-gda4373fbcf00 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc90003b5f9c8 EFLAGS: 00010283
RAX: 0000000000004e6e RBX: 0000000000000000 RCX: ffffc90025bfd000
RDX: 0000000000040000 RSI: ffffea00017b4b80 RDI: ffff88804f0288c0
RBP: ffffea00017b4b80 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff961c9e08 R12: 1ffff9200076bf3a
R13: ffff88804f0288c0 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f87f120f6c0(0000) GS:ffff88806a600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000517fe000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 filemap_read_folio+0xc6/0x2a0 mm/filemap.c:2367
 do_read_cache_folio+0x263/0x5c0 mm/filemap.c:3825
 freader_get_folio+0x337/0x8e0 lib/buildid.c:77
 freader_fetch+0xc2/0x5f0 lib/buildid.c:120
 __build_id_parse.isra.0+0xed/0x7a0 lib/buildid.c:305
 do_procmap_query+0xd62/0x1030 fs/proc/task_mmu.c:534
 procfs_procmap_ioctl+0x7d/0xb0 fs/proc/task_mmu.c:613
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __x64_sys_ioctl+0x18f/0x220 fs/ioctl.c:893
 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: 0033:0x7f87f037e719
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:00007f87f120f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f87f0535f80 RCX: 00007f87f037e719
RDX: 0000000020000180 RSI: 00000000c0686611 RDI: 0000000000000008
RBP: 00007f87f03f139e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f87f0535f80 R15: 00007ffd9ad815a8
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc90003b5f9c8 EFLAGS: 00010283
RAX: 0000000000004e6e RBX: 0000000000000000 RCX: ffffc90025bfd000
RDX: 0000000000040000 RSI: ffffea00017b4b80 RDI: ffff88804f0288c0
RBP: ffffea00017b4b80 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff961c9e08 R12: 1ffff9200076bf3a
R13: ffff88804f0288c0 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f87f120f6c0(0000) GS:ffff88806a600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000517fe000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400