loop0: detected capacity change from 32768 to 19480
------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:900!
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+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 f6 94 64 fe e9 90 da ff ff e8 2c b0 f7 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:ffffc9000dcf6900 EFLAGS: 00010287
RAX: ffffffff83ce15e4 RBX: 00000000ffffffff RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 0000000000000564 RDI: 0000000000000565
RBP: ffffc9000dcf6dd0 R08: ffffffff90304df7 R09: 1ffffffff20609be
R10: dffffc0000000000 R11: fffffbfff20609bf R12: ffff888046f85c60
R13: ffff888058c1ae00 R14: dffffc0000000000 R15: fffff52001b9ed4c
FS:  00007fe9f22aa6c0(0000) GS:ffff88808c891000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560507ac5370 CR3: 0000000012672000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_reserve_cluster_bitmap_bits fs/ocfs2/suballoc.c:1228 [inline]
 ocfs2_reserve_clusters_with_limit+0x3bc/0xc20 fs/ocfs2/suballoc.c:1273
 ocfs2_block_group_alloc fs/ocfs2/suballoc.c:768 [inline]
 ocfs2_reserve_suballoc_bits+0x794/0x4840 fs/ocfs2/suballoc.c:928
 ocfs2_reserve_new_metadata_blocks+0x415/0x9a0 fs/ocfs2/suballoc.c:1078
 ocfs2_reserve_new_metadata fs/ocfs2/suballoc.c:1121 [inline]
 ocfs2_lock_allocators+0x299/0x600 fs/ocfs2/suballoc.c:3087
 ocfs2_extend_allocation+0x404/0x1880 fs/ocfs2/file.c:590
 ocfs2_allocate_unwritten_extents+0x306/0x840 fs/ocfs2/file.c:1503
 __ocfs2_change_file_space+0x917/0xf10 fs/ocfs2/file.c:2030
 ocfs2_fallocate+0x1f5/0x240 fs/ocfs2/file.c:2145
 vfs_fallocate+0x669/0x7e0 fs/open.c:338
 ksys_fallocate fs/open.c:362 [inline]
 __do_sys_fallocate fs/open.c:367 [inline]
 __se_sys_fallocate fs/open.c:365 [inline]
 __x64_sys_fallocate+0xc0/0x110 fs/open.c:365
 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: 0033:0x7fe9f139ce59
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:00007fe9f22a9fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fe9f1616090 RCX: 00007fe9f139ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000009
RBP: 00007fe9f1432d6f R08: 0000000000000000 R09: 0000000000000000
R10: 00000000001001f0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe9f1616128 R14: 00007fe9f1616090 R15: 00007ffcd92a5198
 </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 f6 94 64 fe e9 90 da ff ff e8 2c b0 f7 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:ffffc9000dcf6900 EFLAGS: 00010287
RAX: ffffffff83ce15e4 RBX: 00000000ffffffff RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 0000000000000564 RDI: 0000000000000565
RBP: ffffc9000dcf6dd0 R08: ffffffff90304df7 R09: 1ffffffff20609be
R10: dffffc0000000000 R11: fffffbfff20609bf R12: ffff888046f85c60
R13: ffff888058c1ae00 R14: dffffc0000000000 R15: fffff52001b9ed4c
FS:  00007fe9f22aa6c0(0000) GS:ffff88808c891000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe9e8000020 CR3: 0000000012672000 CR4: 0000000000352ef0