loop0: detected capacity change from 0 to 1024
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
overlay: filesystem on ./bus is read-only
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: 5339 Comm: syz.0.0 Not tainted syzkaller #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:ffffc9000cd3f958 EFLAGS: 00010287
RAX: ffffffff81fbd4f4 RBX: 1ffffd40002acaa0 RCX: 0000000000100000
RDX: ffffc90020802000 RSI: ffffea0001565500 RDI: ffff888011193000
RBP: ffffc9000cd3fa18 R08: ffffea0001565507 R09: 1ffffd40002acaa0
R10: dffffc0000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffea0001565508 R14: ffffea0001565500 R15: 1ffffd40002acaa1
FS:  00007f2cb62af6c0(0000) GS:ffff88808d414000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000002316a000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 filemap_read_folio+0x117/0x380 mm/filemap.c:2496
 do_read_cache_folio+0x358/0x590 mm/filemap.c:4096
 freader_get_folio+0x3c7/0x830 lib/buildid.c:58
 freader_fetch+0xa3/0x750 lib/buildid.c:101
 __build_id_parse+0x133/0x7d0 lib/buildid.c:289
 do_procmap_query fs/proc/task_mmu.c:733 [inline]
 procfs_procmap_ioctl+0x76f/0xce0 fs/proc/task_mmu.c:813
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2cb538f7c9
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:00007f2cb62af038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2cb55e5fa0 RCX: 00007f2cb538f7c9
RDX: 0000200000000180 RSI: 00000000c0686611 RDI: 0000000000000007
RBP: 00007f2cb5413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2cb55e6038 R14: 00007f2cb55e5fa0 R15: 00007ffca26f8208
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc9000cd3f958 EFLAGS: 00010287
RAX: ffffffff81fbd4f4 RBX: 1ffffd40002acaa0 RCX: 0000000000100000
RDX: ffffc90020802000 RSI: ffffea0001565500 RDI: ffff888011193000
RBP: ffffc9000cd3fa18 R08: ffffea0001565507 R09: 1ffffd40002acaa0
R10: dffffc0000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffea0001565508 R14: ffffea0001565500 R15: 1ffffd40002acaa1
FS:  00007f2cb62af6c0(0000) GS:ffff88808d414000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000002316a000 CR4: 0000000000352ef0