loop2: detected capacity change from 0 to 32768
=======================================================
WARNING: The mand mount option has been deprecated and
         and is ignored by this kernel. Remove the mand
         option from the mount to silence this warning.
=======================================================
Oops: divide error: 0000 [#1] SMP PTI
CPU: 1 UID: 0 PID: 3359 Comm: syz.2.16 Not tainted 6.15.0-rc4-syzkaller #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:bch2_sb_members_v2_to_text+0x5c/0x170 fs/bcachefs/sb-members.c:347
Code: 05 00 00 00 e8 b5 d8 01 00 48 89 c1 41 8b 06 49 8d 04 c6 48 29 c8 48 83 c0 f8 41 0f b7 4e 08 48 89 c2 48 c1 ea 20 74 0a 48 99 <48> f7 f9 49 89 c4 eb 07 31 d2 f7 f1 41 89 c4 41 0f b6 4f 7b 41 39
RSP: 0018:ffffc9000329b5a8 EFLAGS: 00010a06
RAX: ffff88810eff4368 RBX: ffffc9000329b918 RCX: 0000000000000000
RDX: ffffffffffffffff RSI: 0000000000000005 RDI: ffff88810eff4000
RBP: 0000000000000000 R08: 000000000000003a R09: 000000000000003a
R10: 0000000000000000 R11: ffffffff81c310e0 R12: 00000000fffff6fa
R13: 000000000000000b R14: ffff88810eff4330 R15: ffff88810eff4000
FS:  00007f201b42a6c0(0000) GS:ffff8882b32da000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f201a571d60 CR3: 000000010dfb0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_sb_field_validate+0xbc/0x100 fs/bcachefs/super-io.c:1380
 bch2_sb_validate+0x5b9/0x690 fs/bcachefs/super-io.c:552
 __bch2_read_super+0x505/0x530 fs/bcachefs/super-io.c:925
 bch2_fs_open+0x144/0x500 fs/bcachefs/super.c:2383
 bch2_fs_get_tree+0x22c/0x760 fs/bcachefs/fs.c:2473
 vfs_get_tree+0x26/0xb0 fs/super.c:1759
 do_new_mount+0x13f/0x380 fs/namespace.c:3884
 do_mount fs/namespace.c:4224 [inline]
 __do_sys_mount fs/namespace.c:4435 [inline]
 __se_sys_mount+0x147/0x1b0 fs/namespace.c:4412
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x8f/0x170 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f201a5900ca
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:00007f201b429e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f201b429ef0 RCX: 00007f201a5900ca
RDX: 0000200000000000 RSI: 0000200000011a40 RDI: 00007f201b429eb0
RBP: 0000200000000000 R08: 00007f201b429ef0 R09: 00000000028080c9
R10: 00000000028080c9 R11: 0000000000000246 R12: 0000200000011a40
R13: 00007f201b429eb0 R14: 00000000000119f9 R15: 0000200000013d00
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_sb_members_v2_to_text+0x5c/0x170 fs/bcachefs/sb-members.c:347
Code: 05 00 00 00 e8 b5 d8 01 00 48 89 c1 41 8b 06 49 8d 04 c6 48 29 c8 48 83 c0 f8 41 0f b7 4e 08 48 89 c2 48 c1 ea 20 74 0a 48 99 <48> f7 f9 49 89 c4 eb 07 31 d2 f7 f1 41 89 c4 41 0f b6 4f 7b 41 39
RSP: 0018:ffffc9000329b5a8 EFLAGS: 00010a06
RAX: ffff88810eff4368 RBX: ffffc9000329b918 RCX: 0000000000000000
RDX: ffffffffffffffff RSI: 0000000000000005 RDI: ffff88810eff4000
RBP: 0000000000000000 R08: 000000000000003a R09: 000000000000003a
R10: 0000000000000000 R11: ffffffff81c310e0 R12: 00000000fffff6fa
R13: 000000000000000b R14: ffff88810eff4330 R15: ffff88810eff4000
FS:  00007f201b42a6c0(0000) GS:ffff8882b32da000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f201a571d60 CR3: 000000010dfb0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	05 00 00 00 e8       	add    $0xe8000000,%eax
   5:	b5 d8                	mov    $0xd8,%ch
   7:	01 00                	add    %eax,(%rax)
   9:	48 89 c1             	mov    %rax,%rcx
   c:	41 8b 06             	mov    (%r14),%eax
   f:	49 8d 04 c6          	lea    (%r14,%rax,8),%rax
  13:	48 29 c8             	sub    %rcx,%rax
  16:	48 83 c0 f8          	add    $0xfffffffffffffff8,%rax
  1a:	41 0f b7 4e 08       	movzwl 0x8(%r14),%ecx
  1f:	48 89 c2             	mov    %rax,%rdx
  22:	48 c1 ea 20          	shr    $0x20,%rdx
  26:	74 0a                	je     0x32
  28:	48 99                	cqto
* 2a:	48 f7 f9             	idiv   %rcx <-- trapping instruction
  2d:	49 89 c4             	mov    %rax,%r12
  30:	eb 07                	jmp    0x39
  32:	31 d2                	xor    %edx,%edx
  34:	f7 f1                	div    %ecx
  36:	41 89 c4             	mov    %eax,%r12d
  39:	41 0f b6 4f 7b       	movzbl 0x7b(%r15),%ecx
  3e:	41                   	rex.B
  3f:	39                   	.byte 0x39