loop0: detected capacity change from 0 to 32768
bcachefs (loop0): starting version 1.7: mi_btree_bitmap opts=metadata_checksum=none,data_checksum=none,compression=lz4,nojournal_transaction_names
invalid journal entry, version=1.7: mi_btree_bitmap type=btree_root in superblock: invalid btree root journal entry: wrong number of keys, shutting down
bcachefs (loop0): inconsistency detected - emergency read only at journal seq 0
bcachefs (loop0): bch2_fs_recovery(): error fsck_errors_not_fixed
bcachefs (loop0): bch2_fs_start(): error starting filesystem fsck_errors_not_fixed
bcachefs (loop0): shutting down
bcachefs (loop0): shutdown complete
bcachefs: bch2_fs_get_tree() error: fsck_errors_not_fixed
loop0: detected capacity change from 0 to 64
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 3cba2067 P4D 3cba2067 PUD 4102b067 PMD 0 
Oops: Oops: 0010 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5322 Comm: syz.0.0 Not tainted 6.12.0-rc7-syzkaller-00012-g3022e9d00ebe #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:ffffc9000d3478d8 EFLAGS: 00010283
RAX: ffffffff81cdcebc RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc9000d6c1000 RSI: ffffea000131be80 RDI: ffff8880001a1e00
RBP: ffffc9000d347990 R08: ffffffff81cdce86 R09: 1ffffd40002637d0
R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffffd40002637d0
R13: ffffea000131be80 R14: ffffc9000d347920 R15: 1ffffd40002637d1
FS:  00007f6d401c26c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000000066e000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 filemap_read_folio+0x14b/0x630 mm/filemap.c:2367
 do_read_cache_folio+0x3f5/0x850 mm/filemap.c:3825
 freader_get_folio+0x57a/0xb50 lib/buildid.c:77
 freader_fetch+0x9d/0x650 lib/buildid.c:120
 __build_id_parse+0x188/0x8a0 lib/buildid.c:305
 do_procmap_query fs/proc/task_mmu.c:534 [inline]
 procfs_procmap_ioctl+0xcf5/0x1600 fs/proc/task_mmu.c:613
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6d3f37e719
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:00007f6d401c2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6d3f535f80 RCX: 00007f6d3f37e719
RDX: 0000000020000180 RSI: 00000000c0686611 RDI: 000000000000000a
RBP: 00007f6d3f3f1616 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6d3f535f80 R15: 00007ffc1e7487b8
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc9000d3478d8 EFLAGS: 00010283
RAX: ffffffff81cdcebc RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc9000d6c1000 RSI: ffffea000131be80 RDI: ffff8880001a1e00
RBP: ffffc9000d347990 R08: ffffffff81cdce86 R09: 1ffffd40002637d0
R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffffd40002637d0
R13: ffffea000131be80 R14: ffffc9000d347920 R15: 1ffffd40002637d1
FS:  00007f6d401c26c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000000066e000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400