loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:3028 assert(bitno < 32)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3028!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5328 Comm: syz.0.0 Not tainted 6.16.0-rc1-syzkaller-00239-g08215f5486ec #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3028
Code: e9 fd 90 0f 0b e8 92 b5 82 fe 48 c7 c7 40 c2 c3 8b 48 c7 c6 80 bf c3 8b ba d4 0b 00 00 48 c7 c1 20 ca c3 8b e8 03 e8 e9 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:ffffc9000f467590 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 8f49c26e65842e00
RDX: ffffc9000db6a000 RSI: 0000000000001cb3 RDI: 0000000000001cb4
RBP: 00000000ffffffff R08: ffffc9000f4672a7 R09: 1ffff92001e8ce54
R10: dffffc0000000000 R11: fffff52001e8ce55 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f07c3a486c0(0000) GS:ffff88808d251000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000010 CR3: 000000003f42d000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dbAllocDmapLev+0x16b/0x3c0 fs/jfs/jfs_dmap.c:1977
 dbAllocCtl+0x14a/0x9b0 fs/jfs/jfs_dmap.c:1817
 dbAllocAG+0x1e8/0xf10 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_create+0x6c8/0xa80 fs/jfs/namei.c:137
 vfs_create+0x24e/0x400 fs/namei.c:3405
 do_mknodat+0x3c6/0x4d0 fs/namei.c:4285
 __do_sys_mknod fs/namei.c:4318 [inline]
 __se_sys_mknod fs/namei.c:4316 [inline]
 __x64_sys_mknod+0x8c/0xa0 fs/namei.c:4316
 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: 0033:0x7f07c2b8e929
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:00007f07c3a48038 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007f07c2db5fa0 RCX: 00007f07c2b8e929
RDX: 0000000000000701 RSI: 0000000000000000 RDI: 0000200000000000
RBP: 00007f07c2c10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f07c2db5fa0 R15: 00007fffe6315c18
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3028
Code: e9 fd 90 0f 0b e8 92 b5 82 fe 48 c7 c7 40 c2 c3 8b 48 c7 c6 80 bf c3 8b ba d4 0b 00 00 48 c7 c1 20 ca c3 8b e8 03 e8 e9 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:ffffc9000f467590 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 8f49c26e65842e00
RDX: ffffc9000db6a000 RSI: 0000000000001cb3 RDI: 0000000000001cb4
RBP: 00000000ffffffff R08: ffffc9000f4672a7 R09: 1ffff92001e8ce54
R10: dffffc0000000000 R11: fffff52001e8ce55 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f07c3a486c0(0000) GS:ffff88808d251000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f07c3a26fc8 CR3: 000000003f42d000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400