loop0: detected capacity change from 32768 to 32511
------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:806!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5339 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~bpo12+1 04/01/2014
RIP: 0010:ocfs2_reserve_suballoc_bits+0x3ea8/0x45b0 fs/ocfs2/suballoc.c:806
Code: 78 e9 59 f2 ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c ce dd ff ff 4c 89 f7 e8 13 5b 78 fe e9 c1 dd ff ff e8 e9 85 10 fe 90 <0f> 0b 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 82 df ff ff 4c 89 ff
RSP: 0018:ffffc9000d46e8a0 EFLAGS: 00010287
RAX: ffffffff83b0e9c7 RBX: ffff888038d67e00 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 00000000000003b0 RDI: 00000000000003b1
RBP: ffffc9000d46ed70 R08: ffffffff8f817077 R09: 1ffffffff1f02e0e
R10: dffffc0000000000 R11: fffffbfff1f02e0f R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888042bc4fb8 R15: 00000000ffffffff
FS:  00007f5c7544d6c0(0000) GS:ffff88808d679000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5c68436000 CR3: 0000000011429000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_reserve_cluster_bitmap_bits fs/ocfs2/suballoc.c:1134 [inline]
 ocfs2_reserve_clusters_with_limit+0x2fb/0xba0 fs/ocfs2/suballoc.c:1179
 ocfs2_block_group_alloc fs/ocfs2/suballoc.c:674 [inline]
 ocfs2_reserve_suballoc_bits+0x6eb/0x45b0 fs/ocfs2/suballoc.c:834
 ocfs2_reserve_new_metadata_blocks+0x403/0x940 fs/ocfs2/suballoc.c:984
 ocfs2_create_refcount_tree+0x274/0x1240 fs/ocfs2/refcounttree.c:571
 ocfs2_reflink_remap_blocks+0x2ea/0x1930 fs/ocfs2/refcounttree.c:4646
 ocfs2_remap_file_range+0x4b7/0x730 fs/ocfs2/file.c:2740
 vfs_copy_file_range+0xd81/0x1370 fs/read_write.c:1598
 __do_sys_copy_file_range fs/read_write.c:1681 [inline]
 __se_sys_copy_file_range+0x2fb/0x470 fs/read_write.c:1648
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5c7458f7c9
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:00007f5c7544d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000146
RAX: ffffffffffffffda RBX: 00007f5c747e6090 RCX: 00007f5c7458f7c9
RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 00007f5c74613f91 R08: fffffbffa003e458 R09: 0700000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5c747e6128 R14: 00007f5c747e6090 R15: 00007ffd89fe3ed8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_reserve_suballoc_bits+0x3ea8/0x45b0 fs/ocfs2/suballoc.c:806
Code: 78 e9 59 f2 ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c ce dd ff ff 4c 89 f7 e8 13 5b 78 fe e9 c1 dd ff ff e8 e9 85 10 fe 90 <0f> 0b 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 82 df ff ff 4c 89 ff
RSP: 0018:ffffc9000d46e8a0 EFLAGS: 00010287
RAX: ffffffff83b0e9c7 RBX: ffff888038d67e00 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 00000000000003b0 RDI: 00000000000003b1
RBP: ffffc9000d46ed70 R08: ffffffff8f817077 R09: 1ffffffff1f02e0e
R10: dffffc0000000000 R11: fffffbfff1f02e0f R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888042bc4fb8 R15: 00000000ffffffff
FS:  00007f5c7544d6c0(0000) GS:ffff88808d679000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5c68436000 CR3: 0000000011429000 CR4: 0000000000352ef0