------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:875!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5330 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+0x40cb/0x4940 fs/ocfs2/suballoc.c:875
Code: 24 70 e9 23 f1 ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c af da ff ff 48 89 df e8 50 17 67 fe e9 a2 da ff ff e8 66 3b fb fd 90 <0f> 0b 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 42 dc ff ff 4c 89 f7
RSP: 0018:ffffc9000db2df20 EFLAGS: 00010283
RAX: ffffffff83ca890a RBX: 00000000ffffffff RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 0000000000059a3f RDI: 0000000000059a40
RBP: ffffc9000db2e3f0 R08: ffffffff9011f1b7 R09: 1ffffffff2023e36
R10: dffffc0000000000 R11: fffffbfff2023e37 R12: ffff888047e2ddf8
R13: ffff888042bc4e00 R14: dffffc0000000000 R15: fffff52001b65c10
FS:  00007f0ca4bad6c0(0000) GS:ffff88808ca4c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000cd000 CR3: 0000000044a97000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_reserve_cluster_bitmap_bits fs/ocfs2/suballoc.c:1203 [inline]
 ocfs2_reserve_clusters_with_limit+0x3bc/0xc20 fs/ocfs2/suballoc.c:1248
 ocfs2_block_group_alloc fs/ocfs2/suballoc.c:743 [inline]
 ocfs2_reserve_suballoc_bits+0x78e/0x4940 fs/ocfs2/suballoc.c:903
 ocfs2_reserve_new_metadata_blocks+0x415/0x9a0 fs/ocfs2/suballoc.c:1053
 ocfs2_reserve_new_metadata fs/ocfs2/suballoc.c:1096 [inline]
 ocfs2_lock_allocators+0x299/0x600 fs/ocfs2/suballoc.c:3062
 ocfs2_dio_end_io_write fs/ocfs2/aops.c:2321 [inline]
 ocfs2_dio_end_io+0x677/0x1210 fs/ocfs2/aops.c:2403
 dio_complete+0x25b/0x790 fs/direct-io.c:281
 __blockdev_direct_IO+0x2cb0/0x32f0 fs/direct-io.c:1303
 ocfs2_direct_IO+0x251/0x2c0 fs/ocfs2/aops.c:2440
 generic_file_direct_write+0x1db/0x3e0 mm/filemap.c:4253
 __generic_file_write_iter+0x11d/0x230 mm/filemap.c:4422
 ocfs2_file_write_iter+0x1663/0x1ed0 fs/ocfs2/file.c:2476
 iter_file_splice_write+0x9a1/0x10f0 fs/splice.c:736
 do_splice_from fs/splice.c:936 [inline]
 direct_splice_actor+0x101/0x160 fs/splice.c:1159
 splice_direct_to_actor+0x53a/0xc70 fs/splice.c:1103
 do_splice_direct_actor fs/splice.c:1202 [inline]
 do_splice_direct+0x195/0x290 fs/splice.c:1228
 do_sendfile+0x535/0x7d0 fs/read_write.c:1372
 __do_sys_sendfile64 fs/read_write.c:1433 [inline]
 __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1419
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0ca3d9c819
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:00007f0ca4bacfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f0ca4016090 RCX: 00007f0ca3d9c819
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000009
RBP: 00007f0ca3e32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000080000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0ca4016128 R14: 00007f0ca4016090 R15: 00007ffc7f6a8028
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_reserve_suballoc_bits+0x40cb/0x4940 fs/ocfs2/suballoc.c:875
Code: 24 70 e9 23 f1 ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c af da ff ff 48 89 df e8 50 17 67 fe e9 a2 da ff ff e8 66 3b fb fd 90 <0f> 0b 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 42 dc ff ff 4c 89 f7
RSP: 0018:ffffc9000db2df20 EFLAGS: 00010283
RAX: ffffffff83ca890a RBX: 00000000ffffffff RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 0000000000059a3f RDI: 0000000000059a40
RBP: ffffc9000db2e3f0 R08: ffffffff9011f1b7 R09: 1ffffffff2023e36
R10: dffffc0000000000 R11: fffffbfff2023e37 R12: ffff888047e2ddf8
R13: ffff888042bc4e00 R14: dffffc0000000000 R15: fffff52001b65c10
FS:  00007f0ca4bad6c0(0000) GS:ffff88808ca4c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000001dc000 CR3: 0000000044a97000 CR4: 0000000000352ef0