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kernel BUG at fs/ocfs2/suballoc.c:922!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5321 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 f3 f0 61 fe e9 bd da ff ff e8 69 c7 f2 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:ffffc9000c806620 EFLAGS: 00010283
RAX: ffffffff83d379d7 RBX: 0000000000000001 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 000000000008fe50 RDI: 000000000008fe51
RBP: ffffc9000c806af0 R08: ffffffff9032d3f7 R09: 1ffffffff2065a7e
R10: dffffc0000000000 R11: fffffbfff2065a7f R12: ffff888044225c60
R13: ffff888043b91e00 R14: dffffc0000000000 R15: fffff52001900cf0
FS:  00007f9b8fe8f6c0(0000) GS:ffff88808c821000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000008f000 CR3: 0000000012a18000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_reserve_cluster_bitmap_bits+0xc4/0x1d0 fs/ocfs2/suballoc.c:1250
 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+0x8d0/0x2680 fs/ocfs2/localalloc.c:669
 ocfs2_reserve_clusters_with_limit+0x1b9/0xc20 fs/ocfs2/suballoc.c:1284
 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1345 [inline]
 ocfs2_lock_allocators+0x2d1/0x5f0 fs/ocfs2/suballoc.c:3120
 ocfs2_write_begin_nolock+0x1b7b/0x41f0 fs/ocfs2/aops.c:1720
 ocfs2_write_begin+0x1ba/0x310 fs/ocfs2/aops.c:1885
 generic_perform_write+0x2d5/0x8f0 mm/filemap.c:4363
 ocfs2_file_write_iter+0x1706/0x1f10 fs/ocfs2/file.c:2481
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_write+0x150/0x270 fs/read_write.c:739
 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: 0033:0x7f9b8ef9ce59
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:00007f9b8fe8efe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9b8f216090 RCX: 00007f9b8ef9ce59
RDX: 000000000208e24b RSI: 0000200000000380 RDI: 0000000000000007
RBP: 00007f9b8f032e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9b8f216128 R14: 00007f9b8f216090 R15: 00007ffcf54c7198
 </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 f3 f0 61 fe e9 bd da ff ff e8 69 c7 f2 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:ffffc9000c806620 EFLAGS: 00010283
RAX: ffffffff83d379d7 RBX: 0000000000000001 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 000000000008fe50 RDI: 000000000008fe51
RBP: ffffc9000c806af0 R08: ffffffff9032d3f7 R09: 1ffffffff2065a7e
R10: dffffc0000000000 R11: fffffbfff2065a7f R12: ffff888044225c60
R13: ffff888043b91e00 R14: dffffc0000000000 R15: fffff52001900cf0
FS:  00007f9b8fe8f6c0(0000) GS:ffff88808c821000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561527f396cf CR3: 0000000012a18000 CR4: 0000000000352ef0