bcachefs (loop8): initializing freespace
BUG: unable to handle page fault for address: fffffffffffff774
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD df3d067 P4D df3d067 PUD df3f067 PMD 0
Oops: Oops: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 19446 Comm: syz.8.2823 Not tainted 6.16.0-rc6-next-20250718-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:bch2_btree_iter_peek_slot+0xb13/0x22f0 fs/bcachefs/btree_iter.c:2867
Code: 85 40 09 00 00 e8 dd c6 97 fd 48 8b 9c 24 f8 00 00 00 48 83 c3 02 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 14 10 00 00 <0f> b6 1b bf 01 00 00 00 89 de e8 ae c9 97 fd 83 fb 01 0f 85 5e 02
RSP: 0018:ffffc9000ad95aa0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: fffffffffffff774 RCX: 0000000000080000
RDX: ffffc9000e081000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000ad95d50 R08: ffff88801a56da00 R09: 0000000000000002
R10: 00000000fffffffe R11: 0000000000000002 R12: ffffc9000ad95ee0
R13: dffffc0000000000 R14: fffffffffffff772 R15: 0000000000000000
FS: 00007fb2522296c0(0000) GS:ffff888125be3000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffff774 CR3: 0000000062988000 CR4: 00000000003526f0
Call Trace:
<TASK>
bch2_btree_iter_peek_max_type fs/bcachefs/btree_iter.h:748 [inline]
bch2_bucket_alloc_early+0xf56/0x1680 fs/bcachefs/alloc_foreground.c:307
bch2_bucket_alloc_trans+0x19df/0x1d50 fs/bcachefs/alloc_foreground.c:541
bch2_bucket_alloc_set_trans+0x51a/0xe90 fs/bcachefs/alloc_foreground.c:725
__open_bucket_add_buckets+0x145d/0x1e00 fs/bcachefs/alloc_foreground.c:919
open_bucket_add_buckets+0x2ee/0x440 fs/bcachefs/alloc_foreground.c:951
bch2_alloc_sectors_start_trans+0xe24/0x1e80 fs/bcachefs/alloc_foreground.c:1266
__bch2_btree_node_alloc fs/bcachefs/btree_update_interior.c:320 [inline]
bch2_btree_reserve_get+0x55d/0x15d0 fs/bcachefs/btree_update_interior.c:528
bch2_btree_update_start+0x14c0/0x1e00 fs/bcachefs/btree_update_interior.c:1254
bch2_btree_split_leaf+0x14b/0x8e0 fs/bcachefs/btree_update_interior.c:1900
bch2_trans_commit_error+0x1b7/0x1130 fs/bcachefs/btree_trans_commit.c:917
__bch2_trans_commit+0x1b63/0x8a70 fs/bcachefs/btree_trans_commit.c:1134
bch2_trans_commit fs/bcachefs/btree_update.h:270 [inline]
bch2_dev_freespace_init+0x93a/0x1000 fs/bcachefs/alloc_background.c:2318
bch2_fs_freespace_init+0xff/0x320 fs/bcachefs/alloc_background.c:2367
bch2_fs_initialize+0x7d8/0xe60 fs/bcachefs/recovery.c:1217
bch2_fs_start+0xa00/0xcc0 fs/bcachefs/super.c:1217
bch2_fs_get_tree+0xb39/0x1540 fs/bcachefs/fs.c:2456
vfs_get_tree+0x92/0x2b0 fs/super.c:1815
do_new_mount+0x2a2/0x9e0 fs/namespace.c:3805
do_mount fs/namespace.c:4133 [inline]
__do_sys_mount fs/namespace.c:4344 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4321
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb25139014a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007fb252228e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fb252228ef0 RCX: 00007fb25139014a
RDX: 0000200000000140 RSI: 0000200000000000 RDI: 00007fb252228eb0
RBP: 0000200000000140 R08: 00007fb252228ef0 R09: 0000000000200414
R10: 0000000000200414 R11: 0000000000000246 R12: 0000200000000000
R13: 00007fb252228eb0 R14: 0000000000005ad0 R15: 0000200000000400
</TASK>
Modules linked in:
CR2: fffffffffffff774
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_btree_iter_peek_slot+0xb13/0x22f0 fs/bcachefs/btree_iter.c:2867
Code: 85 40 09 00 00 e8 dd c6 97 fd 48 8b 9c 24 f8 00 00 00 48 83 c3 02 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 14 10 00 00 <0f> b6 1b bf 01 00 00 00 89 de e8 ae c9 97 fd 83 fb 01 0f 85 5e 02
RSP: 0018:ffffc9000ad95aa0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: fffffffffffff774 RCX: 0000000000080000
RDX: ffffc9000e081000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000ad95d50 R08: ffff88801a56da00 R09: 0000000000000002
R10: 00000000fffffffe R11: 0000000000000002 R12: ffffc9000ad95ee0
R13: dffffc0000000000 R14: fffffffffffff772 R15: 0000000000000000
FS: 00007fb2522296c0(0000) GS:ffff888125be3000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffff774 CR3: 0000000062988000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 85 40 09 test %eax,0x9(%rax)
3: 00 00 add %al,(%rax)
5: e8 dd c6 97 fd call 0xfd97c6e7
a: 48 8b 9c 24 f8 00 00 mov 0xf8(%rsp),%rbx
11: 00
12: 48 83 c3 02 add $0x2,%rbx
16: 48 89 d8 mov %rbx,%rax
19: 48 c1 e8 03 shr $0x3,%rax
1d: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax
22: 84 c0 test %al,%al
24: 0f 85 14 10 00 00 jne 0x103e
* 2a: 0f b6 1b movzbl (%rbx),%ebx <-- trapping instruction
2d: bf 01 00 00 00 mov $0x1,%edi
32: 89 de mov %ebx,%esi
34: e8 ae c9 97 fd call 0xfd97c9e7
39: 83 fb 01 cmp $0x1,%ebx
3c: 0f .byte 0xf
3d: 85 5e 02 test %ebx,0x2(%rsi)