BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 0 P4D 0 
Oops: Oops: 0010 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5304 Comm: syz-executor294 Not tainted 6.14.0-syzkaller-02665-g1e26c5e28ca5 #0 PREEMPT(full) 
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:ffffc9000314f8b8 EFLAGS: 00010293
RAX: ffffffff81fdbd4a RBX: 0000000000000000 RCX: ffff888000bb0000
RDX: 0000000000000000 RSI: ffffea000120e1c0 RDI: ffff8880340378c0
RBP: ffffc9000314f980 R08: ffffffff81fdbd0e R09: 1ffffd4000241c38
R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffffd4000241c38
R13: ffffea000120e1c0 R14: ffffc9000314f900 R15: 1ffffd4000241c39
FS:  000055558bdf7380(0000) GS:ffff88808c825000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000004091a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 filemap_read_folio+0x14a/0x3b0 mm/filemap.c:2400
 do_read_cache_folio+0x373/0x5b0 mm/filemap.c:3884
 freader_get_folio+0x54d/0x880 lib/buildid.c:77
 freader_fetch+0x9d/0x5b0 lib/buildid.c:120
 __build_id_parse+0x185/0x8e0 lib/buildid.c:305
 do_procmap_query fs/proc/task_mmu.c:534 [inline]
 procfs_procmap_ioctl+0xd09/0x1680 fs/proc/task_mmu.c:613
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe818bec6e9
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcdb6f1438 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffcdb6f1440 RCX: 00007fe818bec6e9
RDX: 0000200000000180 RSI: 00000000c0686611 RDI: 0000000000000004
RBP: 00007fe818c5f610 R08: 0000000000000000 R09: 65732f636f72702f
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffcdb6f1678 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc9000314f8b8 EFLAGS: 00010293
RAX: ffffffff81fdbd4a RBX: 0000000000000000 RCX: ffff888000bb0000
RDX: 0000000000000000 RSI: ffffea000120e1c0 RDI: ffff8880340378c0
RBP: ffffc9000314f980 R08: ffffffff81fdbd0e R09: 1ffffd4000241c38
R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffffd4000241c38
R13: ffffea000120e1c0 R14: ffffc9000314f900 R15: 1ffffd4000241c39
FS:  000055558bdf7380(0000) GS:ffff88808c825000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000004091a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400