loop4: detected capacity change from 0 to 32768
ERROR: (device loop4): diAllocBit: iag inconsistent
ialloc: diAlloc returned -5!
ERROR: (device loop4): diAllocBit: iag inconsistent
ialloc: diAlloc returned -5!
BUG at fs/jfs/jfs_dmap.c:3036 assert(bitno < 32)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3036!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 7484 Comm: syz.4.223 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3036
Code: ed fd 90 0f 0b e8 f2 a5 84 fe 48 c7 c7 40 08 24 8b 48 c7 c6 80 05 24 8b ba dc 0b 00 00 48 c7 c1 20 10 24 8b e8 d3 24 ed fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41
RSP: 0018:ffffc90003fc7588 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 7a32dfb7c5de9c00
RDX: ffffc9000e9ec000 RSI: 00000000000017b6 RDI: 00000000000017b7
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff520007f8e55 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007ff7116866c0(0000) GS:ffff888126df7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff7092a5000 CR3: 0000000052f14000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x16b/0x3c0 fs/jfs/jfs_dmap.c:1985
 dbAllocCtl+0x14a/0x9c0 fs/jfs/jfs_dmap.c:1825
 dbAllocAG+0x1e6/0xff0 fs/jfs/jfs_dmap.c:1353
 dbAlloc+0x5a8/0xba0 fs/jfs/jfs_dmap.c:877
 dtSplitUp fs/jfs/jfs_dtree.c:982 [inline]
 dtInsert+0xad5/0x5f40 fs/jfs/jfs_dtree.c:871
 jfs_mknod+0x640/0x960 fs/jfs/namei.c:1410
 vfs_mknod+0x37f/0x3c0 fs/namei.c:4322
 do_mknodat+0x385/0x4d0 fs/namei.c:-1
 __do_sys_mknod fs/namei.c:4405 [inline]
 __se_sys_mknod fs/namei.c:4403 [inline]
 __x64_sys_mknod+0x8c/0xa0 fs/namei.c:4403
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff71341f6c9
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:00007ff711686038 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007ff713675fa0 RCX: 00007ff71341f6c9
RDX: 0000000000000708 RSI: 000000000000c000 RDI: 0000200000000f80
RBP: 00007ff7134a1f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff713676038 R14: 00007ff713675fa0 R15: 00007fff812ea018
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3036
Code: ed fd 90 0f 0b e8 f2 a5 84 fe 48 c7 c7 40 08 24 8b 48 c7 c6 80 05 24 8b ba dc 0b 00 00 48 c7 c1 20 10 24 8b e8 d3 24 ed fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41
RSP: 0018:ffffc90003fc7588 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 7a32dfb7c5de9c00
RDX: ffffc9000e9ec000 RSI: 00000000000017b6 RDI: 00000000000017b7
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff520007f8e55 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007ff7116866c0(0000) GS:ffff888126df7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff7092a5000 CR3: 0000000052f14000 CR4: 00000000003526f0