------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:922!
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 04/01/2014
RIP: 0010:ocfs2_reserve_suballoc_bits+0x40c8/0x4850 fs/ocfs2/suballoc.c:922
Code: 00 00 e9 28 f1 ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c ca da ff ff 48 89 df e8 63 12 48 fe e9 bd da ff ff e8 e9 de d8 fd 90 <0f> 0b 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 60 dc ff ff 4c 89 f7
RSP: 0018:ffffc9000e15e8a0 EFLAGS: 00010283
RAX: ffffffff83ee43f7 RBX: 00000000ffffffff RCX: 0000000000100000
RDX: ffffc90020802000 RSI: 000000000000051f RDI: 0000000000000520
RBP: ffffc9000e15ed70 R08: ffffffff9057c237 R09: 1ffffffff20af846
R10: dffffc0000000000 R11: fffffbfff20af847 R12: ffff8880444e5c60
R13: ffff88803b739e00 R14: dffffc0000000000 R15: fffff52001c2bd40
FS:  00007f47dae426c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f587f3ad000 CR3: 000000001d143000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_reserve_cluster_bitmap_bits fs/ocfs2/suballoc.c:1250 [inline]
 ocfs2_reserve_clusters_with_limit+0x3bc/0xc20 fs/ocfs2/suballoc.c:1295
 ocfs2_block_group_alloc fs/ocfs2/suballoc.c:790 [inline]
 ocfs2_reserve_suballoc_bits+0x797/0x4850 fs/ocfs2/suballoc.c:950
 ocfs2_reserve_new_metadata_blocks+0x415/0x9a0 fs/ocfs2/suballoc.c:1100
 ocfs2_create_refcount_tree+0x27c/0x1310 fs/ocfs2/refcounttree.c:571
 ocfs2_reflink_remap_blocks+0x316/0x1aa0 fs/ocfs2/refcounttree.c:4651
 ocfs2_remap_file_range+0x451/0x6f0 fs/ocfs2/file.c:2752
 vfs_copy_file_range+0xd70/0x1340 fs/read_write.c:1599
 __do_sys_copy_file_range fs/read_write.c:1682 [inline]
 __se_sys_copy_file_range+0x2fb/0x480 fs/read_write.c:1649
 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: 0033:0x7f47d9f9e0d9
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:00007f47dae41fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000146
RAX: ffffffffffffffda RBX: 00007f47da226180 RCX: 00007f47d9f9e0d9
RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 00007f47da035024 R08: ffffffffa003e45c R09: 0700000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f47da226218 R14: 00007f47da226180 R15: 00007ffcb2ff98d8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_reserve_suballoc_bits+0x40c8/0x4850 fs/ocfs2/suballoc.c:922
Code: 00 00 e9 28 f1 ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c ca da ff ff 48 89 df e8 63 12 48 fe e9 bd da ff ff e8 e9 de d8 fd 90 <0f> 0b 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 60 dc ff ff 4c 89 f7
RSP: 0018:ffffc9000e15e8a0 EFLAGS: 00010283
RAX: ffffffff83ee43f7 RBX: 00000000ffffffff RCX: 0000000000100000
RDX: ffffc90020802000 RSI: 000000000000051f RDI: 0000000000000520
RBP: ffffc9000e15ed70 R08: ffffffff9057c237 R09: 1ffffffff20af846
R10: dffffc0000000000 R11: fffffbfff20af847 R12: ffff8880444e5c60
R13: ffff88803b739e00 R14: dffffc0000000000 R15: fffff52001c2bd40
FS:  00007f47dae426c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557423f14fa0 CR3: 000000001d143000 CR4: 0000000000352ef0