------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:900!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5323 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+0x40b5/0x4840 fs/ocfs2/suballoc.c:900
Code: 24 78 e9 23 f1 ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 9d da ff ff 48 89 df e8 06 30 65 fe e9 90 da ff ff e8 5c 63 f8 fd 90 <0f> 0b 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 3a dc ff ff 4c 89 f7
RSP: 0018:ffffc9000e2865e0 EFLAGS: 00010246
RAX: ffffffff83cd7074 RBX: 00000000ffffffff RCX: 0000000000100000
RDX: ffffc9000f7b9000 RSI: 00000000000fffff RDI: 0000000000100000
RBP: ffffc9000e286ab0 R08: ffffffff9030e6f7 R09: 1ffffffff2061cde
R10: dffffc0000000000 R11: fffffbfff2061cdf R12: ffff8880475bdc60
R13: ffff88803716de00 R14: dffffc0000000000 R15: fffff52001c50ce8
FS:  00007fdf486026c0(0000) GS:ffff88808c87f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000017c000 CR3: 000000001cf86000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_reserve_cluster_bitmap_bits+0xc4/0x1d0 fs/ocfs2/suballoc.c:1228
 ocfs2_local_alloc_reserve_for_window fs/ocfs2/localalloc.c:1106 [inline]
 ocfs2_local_alloc_slide_window fs/ocfs2/localalloc.c:1242 [inline]
 ocfs2_reserve_local_alloc_bits+0x8c1/0x2660 fs/ocfs2/localalloc.c:669
 ocfs2_reserve_clusters_with_limit+0x1b9/0xc20 fs/ocfs2/suballoc.c:1262
 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1323 [inline]
 ocfs2_lock_allocators+0x2d8/0x600 fs/ocfs2/suballoc.c:3098
 ocfs2_write_begin_nolock+0x1b2a/0x41a0 fs/ocfs2/aops.c:1720
 ocfs2_write_begin+0x1c5/0x320 fs/ocfs2/aops.c:1885
 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4325
 ocfs2_file_write_iter+0x1663/0x1e70 fs/ocfs2/file.c:2476
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x61d/0xb90 fs/read_write.c:688
 ksys_write+0x150/0x270 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdf4779ce59
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:00007fdf48601fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fdf47a16090 RCX: 00007fdf4779ce59
RDX: 000000000208e24b RSI: 0000200000000040 RDI: 0000000000000007
RBP: 00007fdf47832d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdf47a16128 R14: 00007fdf47a16090 R15: 00007ffeda16f568
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_reserve_suballoc_bits+0x40b5/0x4840 fs/ocfs2/suballoc.c:900
Code: 24 78 e9 23 f1 ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 9d da ff ff 48 89 df e8 06 30 65 fe e9 90 da ff ff e8 5c 63 f8 fd 90 <0f> 0b 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 3a dc ff ff 4c 89 f7
RSP: 0018:ffffc9000e2865e0 EFLAGS: 00010246
RAX: ffffffff83cd7074 RBX: 00000000ffffffff RCX: 0000000000100000
RDX: ffffc9000f7b9000 RSI: 00000000000fffff RDI: 0000000000100000
RBP: ffffc9000e286ab0 R08: ffffffff9030e6f7 R09: 1ffffffff2061cde
R10: dffffc0000000000 R11: fffffbfff2061cdf R12: ffff8880475bdc60
R13: ffff88803716de00 R14: dffffc0000000000 R15: fffff52001c50ce8
FS:  00007fdf486026c0(0000) GS:ffff88808c87f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000017c000 CR3: 000000001cf86000 CR4: 0000000000352ef0