loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:3104 assert(bitno < 32)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3104!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5081 Comm: syz.0.15 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:dbFindBits+0x193/0x1a0 fs/jfs/jfs_dmap.c:3104
Code: 13 59 d4 06 0f 0b e8 2c b5 ad fe 48 c7 c7 40 f3 41 8a 48 c7 c6 c0 f0 41 8a ba 20 0c 00 00 48 c7 c1 60 fb 41 8a e8 ed 58 d4 06 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 55 41 57 41 56 41 55 41 54
RSP: 0018:ffffc9000339f1e8 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: a06c9d079956c700
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 00000000ffffffff R08: dffffc0000000000 R09: ffffed10172067b0
R10: ffffed10172067b0 R11: 1ffff110172067af R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f67c96496c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa2f33dc000 CR3: 000000001e5cc000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dbAllocDmapLev+0x169/0x3c0 fs/jfs/jfs_dmap.c:2053
 dbAllocCtl+0x148/0x9b0 fs/jfs/jfs_dmap.c:1893
 dbAllocAG+0x1e7/0xfe0 fs/jfs/jfs_dmap.c:1421
 dbAlloc+0x5a3/0xb90 fs/jfs/jfs_dmap.c:877
 dtSplitUp fs/jfs/jfs_dtree.c:982 [inline]
 dtInsert+0xaac/0x57a0 fs/jfs/jfs_dtree.c:871
 jfs_create+0x69d/0xa50 fs/jfs/namei.c:137
 lookup_open fs/namei.c:3462 [inline]
 open_last_lookups fs/namei.c:3532 [inline]
 path_openat+0x11e1/0x2f30 fs/namei.c:3739
 do_filp_open+0x1b3/0x3e0 fs/namei.c:3769
 do_sys_openat2+0x142/0x4a0 fs/open.c:1253
 do_sys_open fs/open.c:1269 [inline]
 __do_sys_openat fs/open.c:1285 [inline]
 __se_sys_openat fs/open.c:1280 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1280
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f67ca3c0b99
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:00007f67c9649048 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f67ca54efa0 RCX: 00007f67ca3c0b99
RDX: 000000000000275a RSI: 0000000020000040 RDI: ffffffffffffff9c
RBP: 00007f67ca44177e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f67ca54efa0 R15: 00007ffdb7207128
 </TASK>
Modules linked in:
---[ end trace 1d91b751ef570a02 ]---
RIP: 0010:dbFindBits+0x193/0x1a0 fs/jfs/jfs_dmap.c:3104
Code: 13 59 d4 06 0f 0b e8 2c b5 ad fe 48 c7 c7 40 f3 41 8a 48 c7 c6 c0 f0 41 8a ba 20 0c 00 00 48 c7 c1 60 fb 41 8a e8 ed 58 d4 06 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 55 41 57 41 56 41 55 41 54
RSP: 0018:ffffc9000339f1e8 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: a06c9d079956c700
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 00000000ffffffff R08: dffffc0000000000 R09: ffffed10172067b0
R10: ffffed10172067b0 R11: 1ffff110172067af R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f67c96496c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa2f33dc000 CR3: 000000001e5cc000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400