------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:806!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5318 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+0x3f38/0x4640 fs/ocfs2/suballoc.c:806
Code: 78 e9 23 f2 ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 82 dd ff ff 4c 89 f7 e8 43 60 79 fe e9 75 dd ff ff e8 09 1f 12 fe 90 <0f> 0b 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 3c df ff ff 4c 89 ff
RSP: 0018:ffffc9000d425f20 EFLAGS: 00010287
RAX: ffffffff83adf467 RBX: ffff8880435a5e00 RCX: 0000000000100000
RDX: ffffc9000e793000 RSI: 000000000005b7d3 RDI: 000000000005b7d4
RBP: ffffc9000d4263f0 R08: ffffffff8f7d0277 R09: 1ffffffff1efa04e
R10: dffffc0000000000 R11: fffffbfff1efa04f R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88804326cfb8 R15: 00000000ffffffff
FS:  00007f23aa7456c0(0000) GS:ffff88808d730000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005596be9c66e5 CR3: 000000001f9ba000 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/0x4640 fs/ocfs2/suballoc.c:834
 ocfs2_reserve_new_metadata_blocks+0x403/0x940 fs/ocfs2/suballoc.c:984
 ocfs2_reserve_new_metadata fs/ocfs2/suballoc.c:1027 [inline]
 ocfs2_lock_allocators+0x29e/0x5c0 fs/ocfs2/suballoc.c:2761
 ocfs2_dio_end_io_write fs/ocfs2/aops.c:2322 [inline]
 ocfs2_dio_end_io+0x5ba/0x10f0 fs/ocfs2/aops.c:2404
 dio_complete+0x25b/0x790 fs/direct-io.c:281
 __blockdev_direct_IO+0x2e63/0x3490 fs/direct-io.c:1303
 ocfs2_direct_IO+0x25f/0x2d0 fs/ocfs2/aops.c:2441
 generic_file_direct_write+0x1db/0x3e0 mm/filemap.c:4176
 __generic_file_write_iter+0x11d/0x230 mm/filemap.c:4345
 ocfs2_file_write_iter+0x157a/0x1d10 fs/ocfs2/file.c:2469
 iter_file_splice_write+0x975/0x10e0 fs/splice.c:738
 do_splice_from fs/splice.c:938 [inline]
 direct_splice_actor+0x101/0x160 fs/splice.c:1161
 splice_direct_to_actor+0x5a8/0xcc0 fs/splice.c:1105
 do_splice_direct_actor fs/splice.c:1204 [inline]
 do_splice_direct+0x181/0x270 fs/splice.c:1230
 do_sendfile+0x4da/0x7e0 fs/read_write.c:1370
 __do_sys_sendfile64 fs/read_write.c:1431 [inline]
 __se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f23a998f6c9
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:00007f23aa745038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f23a9be6090 RCX: 00007f23a998f6c9
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 000000000000000a
RBP: 00007f23a9a11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000080000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f23a9be6128 R14: 00007f23a9be6090 R15: 00007ffdc9bfe8f8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_reserve_suballoc_bits+0x3f38/0x4640 fs/ocfs2/suballoc.c:806
Code: 78 e9 23 f2 ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 82 dd ff ff 4c 89 f7 e8 43 60 79 fe e9 75 dd ff ff e8 09 1f 12 fe 90 <0f> 0b 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 3c df ff ff 4c 89 ff
RSP: 0018:ffffc9000d425f20 EFLAGS: 00010287
RAX: ffffffff83adf467 RBX: ffff8880435a5e00 RCX: 0000000000100000
RDX: ffffc9000e793000 RSI: 000000000005b7d3 RDI: 000000000005b7d4
RBP: ffffc9000d4263f0 R08: ffffffff8f7d0277 R09: 1ffffffff1efa04e
R10: dffffc0000000000 R11: fffffbfff1efa04f R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88804326cfb8 R15: 00000000ffffffff
FS:  00007f23aa7456c0(0000) GS:ffff88808d730000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564b285953d0 CR3: 000000001f9ba000 CR4: 0000000000352ef0