loop0: detected capacity change from 0 to 32768
=======================================================
WARNING: The mand mount option has been deprecated and
         and is ignored by this kernel. Remove the mand
         option from the mount to silence this warning.
=======================================================
ocfs2: Slot 0 on device (7,0) was already allocated to this node!
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
------------[ cut here ]------------
kernel BUG at fs/ocfs2/aops.c:1418!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5354 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_populate_write_desc fs/ocfs2/aops.c:1418 [inline]
RIP: 0010:ocfs2_write_begin_nolock+0x42e8/0x4340 fs/ocfs2/aops.c:1688
Code: 49 bd 00 00 00 00 00 fc ff df e9 23 fe ff ff e8 3e 53 e1 07 e8 89 77 25 fe 90 0f 0b e8 81 77 25 fe 90 0f 0b e8 79 77 25 fe 90 <0f> 0b e8 71 77 25 fe 90 0f 0b e8 69 77 25 fe 90 0f 0b e8 61 77 25
RSP: 0018:ffffc9000d2cf1a0 EFLAGS: 00010283
RAX: ffffffff839a43c7 RBX: 0000000000000082 RCX: 0000000000100000
RDX: ffffc9000df1a000 RSI: 000000000008e856 RDI: 000000000008e857
RBP: ffffc9000d2cf760 R08: ffff88803ef08000 R09: 0000000000000006
R10: 00000000fffffffc R11: 0000000000000002 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88803e5d6010
FS:  00007f40a3a6f6c0(0000) GS:ffff88808d20f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000010a000 CR3: 00000000433ae000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_write_begin+0x1bb/0x310 fs/ocfs2/aops.c:1884
 generic_perform_write+0x2c5/0x900 mm/filemap.c:4175
 ocfs2_file_write_iter+0x157a/0x1d10 fs/ocfs2/file.c:2469
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f40a2b8ebe9
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:00007f40a3a6f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f40a2db5fa0 RCX: 00007f40a2b8ebe9
RDX: 000000000208e24b RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007f40a2c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f40a2db6038 R14: 00007f40a2db5fa0 R15: 00007ffcfadac028
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_populate_write_desc fs/ocfs2/aops.c:1418 [inline]
RIP: 0010:ocfs2_write_begin_nolock+0x42e8/0x4340 fs/ocfs2/aops.c:1688
Code: 49 bd 00 00 00 00 00 fc ff df e9 23 fe ff ff e8 3e 53 e1 07 e8 89 77 25 fe 90 0f 0b e8 81 77 25 fe 90 0f 0b e8 79 77 25 fe 90 <0f> 0b e8 71 77 25 fe 90 0f 0b e8 69 77 25 fe 90 0f 0b e8 61 77 25
RSP: 0018:ffffc9000d2cf1a0 EFLAGS: 00010283
RAX: ffffffff839a43c7 RBX: 0000000000000082 RCX: 0000000000100000
RDX: ffffc9000df1a000 RSI: 000000000008e856 RDI: 000000000008e857
RBP: ffffc9000d2cf760 R08: ffff88803ef08000 R09: 0000000000000006
R10: 00000000fffffffc R11: 0000000000000002 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88803e5d6010
FS:  00007f40a3a6f6c0(0000) GS:ffff88808d20f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000250000 CR3: 00000000433ae000 CR4: 0000000000352ef0