loop6: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:3013 assert(nb <= DBWORD)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3013!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 12067 Comm: syz.6.840 Not tainted 6.16.0-rc1-syzkaller-00203-g4774cfe3543a #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:dbFindBits+0x177/0x1a0 fs/jfs/jfs_dmap.c:3013
Code: e9 20 ff ff ff e8 29 ea 84 fe 48 c7 c7 00 af c3 8b 48 c7 c6 40 ac c3 8b ba c5 0b 00 00 48 c7 c1 c0 b6 c3 8b e8 1a 29 ec fd 90 <0f> 0b e8 02 ea 84 fe 48 c7 c7 00 af c3 8b 48 c7 c6 40 ac c3 8b ba
RSP: 0018:ffffc9001b61fac0 EFLAGS: 00010246
RAX: 0000000000000032 RBX: 000000000000000a RCX: c6418aa92d391800
RDX: ffffc90015e0d000 RSI: 00000000000022b2 RDI: 00000000000022b3
RBP: 0000000000000000 R08: ffffc9001b61f7e7 R09: 1ffff920036c3efc
R10: dffffc0000000000 R11: fffff520036c3efd R12: 000000000008fba0
R13: 000000000000000a R14: 0000000000000400 R15: ffff88804ad8e000
FS:  00007f942b7f06c0(0000) GS:ffff888125c86000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc263659000 CR3: 000000002f9d0000 CR4: 00000000003526f0
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
 dbDiscardAG+0x2df/0x900 fs/jfs/jfs_dmap.c:1602
 jfs_ioc_trim+0x429/0x690 fs/jfs/jfs_discard.c:106
 jfs_ioctl+0x2b5/0x3d0 fs/jfs/ioctl.c:131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 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: 0033:0x7f942a98e929
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:00007f942b7f0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f942abb5fa0 RCX: 00007f942a98e929
RDX: 0000200000000000 RSI: 00000000c0185879 RDI: 0000000000000006
RBP: 00007f942aa10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f942abb5fa0 R15: 00007fff8d9fe018
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x177/0x1a0 fs/jfs/jfs_dmap.c:3013
Code: e9 20 ff ff ff e8 29 ea 84 fe 48 c7 c7 00 af c3 8b 48 c7 c6 40 ac c3 8b ba c5 0b 00 00 48 c7 c1 c0 b6 c3 8b e8 1a 29 ec fd 90 <0f> 0b e8 02 ea 84 fe 48 c7 c7 00 af c3 8b 48 c7 c6 40 ac c3 8b ba
RSP: 0018:ffffc9001b61fac0 EFLAGS: 00010246
RAX: 0000000000000032 RBX: 000000000000000a RCX: c6418aa92d391800
RDX: ffffc90015e0d000 RSI: 00000000000022b2 RDI: 00000000000022b3
RBP: 0000000000000000 R08: ffffc9001b61f7e7 R09: 1ffff920036c3efc
R10: dffffc0000000000 R11: fffff520036c3efd R12: 000000000008fba0
R13: 000000000000000a R14: 0000000000000400 R15: ffff88804ad8e000
FS:  00007f942b7f06c0(0000) GS:ffff888125d86000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2b7e4b CR3: 000000002f9d0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400