overlayfs: upperdir is in-use as upperdir/workdir of another mount, mount with '-o index=off' to override exclusive upperdir protection.
------------[ cut here ]------------
kernel BUG at fs/ocfs2/aops.c:1159!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5334 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_write_cluster fs/ocfs2/aops.c:1159 [inline]
RIP: 0010:ocfs2_write_cluster_by_desc+0x1cc1/0x1cf0 fs/ocfs2/aops.c:1219
Code: 03 48 8d bc 24 10 02 00 00 48 c7 c6 5a b3 82 8d ba 6a 04 00 00 48 c7 c1 c0 f6 aa 8b e8 18 51 1b 00 90 0f 0b e8 b0 23 20 fe 90 <0f> 0b e8 a8 23 20 fe 90 0f 0b e8 a0 23 20 fe 90 0f 0b e8 98 23 20
RSP: 0018:ffffc9000d3c6520 EFLAGS: 00010293
RAX: ffffffff839f7ff0 RBX: ffff88804256c014 RCX: ffff888000b64900
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000d3c6850 R08: ffff8880429ac023 R09: 1ffff11008535804
R10: dffffc0000000000 R11: ffffed1008535805 R12: ffff888034ea4000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88804256c014
FS:  00007f2fff2956c0(0000) GS:ffff88808d304000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9f23f03720 CR3: 000000001266d000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_write_begin_nolock+0x31a3/0x4340 fs/ocfs2/aops.c:1796
 ocfs2_dio_wr_get_block+0xb6f/0x1770 fs/ocfs2/aops.c:2214
 get_more_blocks fs/direct-io.c:648 [inline]
 do_direct_IO fs/direct-io.c:936 [inline]
 __blockdev_direct_IO+0x16ff/0x3490 fs/direct-io.c:1243
 ocfs2_direct_IO+0x25f/0x2d0 fs/ocfs2/aops.c:2441
 generic_file_direct_write+0x1d8/0x3e0 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+0x5a5/0xcc0 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: 0033:0x7f2ffe38eec9
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:00007f2fff295038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f2ffe5e6090 RCX: 00007f2ffe38eec9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000006
RBP: 00007f2ffe411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000080000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2ffe5e6128 R14: 00007f2ffe5e6090 R15: 00007ffc7a764f88
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_write_cluster fs/ocfs2/aops.c:1159 [inline]
RIP: 0010:ocfs2_write_cluster_by_desc+0x1cc1/0x1cf0 fs/ocfs2/aops.c:1219
Code: 03 48 8d bc 24 10 02 00 00 48 c7 c6 5a b3 82 8d ba 6a 04 00 00 48 c7 c1 c0 f6 aa 8b e8 18 51 1b 00 90 0f 0b e8 b0 23 20 fe 90 <0f> 0b e8 a8 23 20 fe 90 0f 0b e8 a0 23 20 fe 90 0f 0b e8 98 23 20
RSP: 0018:ffffc9000d3c6520 EFLAGS: 00010293
RAX: ffffffff839f7ff0 RBX: ffff88804256c014 RCX: ffff888000b64900
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000d3c6850 R08: ffff8880429ac023 R09: 1ffff11008535804
R10: dffffc0000000000 R11: ffffed1008535805 R12: ffff888034ea4000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88804256c014
FS:  00007f2fff2956c0(0000) GS:ffff88808d304000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000001266d000 CR4: 0000000000352ef0