loop0: detected capacity change from 0 to 32768
------------[ cut here ]------------
lp >= size || lp < 0
WARNING: fs/jfs/jfs_dmap.c:2962 at dbAdjTree+0x3ac/0x430 fs/jfs/jfs_dmap.c:2962, CPU#0: syz.0.0/5320
Modules linked in:
CPU: 0 UID: 0 PID: 5320 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:dbAdjTree+0x3ac/0x430 fs/jfs/jfs_dmap.c:2962
Code: 5f fe eb 0c e8 65 e4 5f fe eb 05 e8 5e e4 5f fe 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 45 e4 5f fe 90 <0f> 0b 90 eb e1 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 8c fc ff ff
RSP: 0018:ffffc9000d9e7428 EFLAGS: 00010283
RAX: ffffffff836660bb RBX: 0000000000002057 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 0000000000005a33 RDI: 0000000000005a34
RBP: 0000000000000005 R08: 0000000000000000 R09: 1ffffd400021e0a8
R10: dffffc0000000000 R11: fffff9400021e0a9 R12: ffff888043c15018
R13: dffffc0000000000 R14: ffff888043c15010 R15: 0000000000000155
FS:  00007f7d701f56c0(0000) GS:ffff88808c848000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000a000 CR3: 000000001b328000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dbSplit+0x132/0x200 fs/jfs/jfs_dmap.c:2735
 dbAllocBits+0x4c4/0xa00 fs/jfs/jfs_dmap.c:2280
 dbAllocDmap+0x64/0x140 fs/jfs/jfs_dmap.c:2121
 dbAlloc+0x46c/0xba0 fs/jfs/jfs_dmap.c:892
 extBalloc fs/jfs/jfs_extent.c:336 [inline]
 extAlloc+0x57d/0x1010 fs/jfs/jfs_extent.c:127
 jfs_get_block+0x351/0xad0 fs/jfs/inode.c:254
 __block_write_begin_int+0x6c2/0x1900 fs/buffer.c:2123
 block_write_begin+0x8d/0x120 fs/buffer.c:2234
 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306
 generic_perform_write+0x2d5/0x8f0 mm/filemap.c:4363
 __generic_file_write_iter+0x1ae/0x230 mm/filemap.c:4477
 generic_file_write_iter+0xae/0x330 mm/filemap.c:4506
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_write+0x150/0x270 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7d73d9ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7d701f4fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7d74015fa0 RCX: 00007f7d73d9ce59
RDX: 00000000ffffffd7 RSI: 0000200000000000 RDI: 0000000000000007
RBP: 00007f7d73e32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7d74016038 R14: 00007f7d74015fa0 R15: 00007ffe3106d5a8
 </TASK>