------------[ cut here ]------------
overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off.
kernel BUG at fs/ext4/inode.c:2794!
9pnet: Could not find request transport: xen
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 233 Comm: kworker/u4:4 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Workqueue: writeback wb_workfn (flush-7:2)
RIP: 0010:ext4_writepages+0x2d31/0x37f0 fs/ext4/inode.c:2794
Code: 00 fc ff df 44 89 64 24 18 48 c1 ea 03 80 3c 02 00 0f 84 25 da ff ff 48 8b 3c 24 e8 89 2d b8 ff e9 17 da ff ff e8 8f 50 82 ff <0f> 0b 4c 8b b4 24 20 01 00 00 e8 80 50 82 ff 0f b6 ac 24 50 02 00
RSP: 0018:ffff8880b4a17500 EFLAGS: 00010293
RAX: ffff8880b49fe4c0 RBX: 0000000000000001 RCX: ffffffff81e03070
RDX: 0000000000000000 RSI: ffffffff81e034e1 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88804e2ce7f0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa5395d2000 CR3: 00000000b3ebe000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
EXT4-fs (loop4): Unrecognized mount option "" or missing value
 do_writepages+0xe5/0x290 mm/page-writeback.c:2344
 __writeback_single_inode+0x10c/0x11d0 fs/fs-writeback.c:1385
 writeback_sb_inodes+0x537/0xef0 fs/fs-writeback.c:1647
 wb_writeback+0x28d/0xcc0 fs/fs-writeback.c:1820
 wb_do_writeback fs/fs-writeback.c:1965 [inline]
 wb_workfn+0x29b/0x1250 fs/fs-writeback.c:2006
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
9pnet: Could not find request transport: xen
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Modules linked in:
---[ end trace 6e675c20af9f3fea ]---
RIP: 0010:ext4_writepages+0x2d31/0x37f0 fs/ext4/inode.c:2794
Code: 00 fc ff df 44 89 64 24 18 48 c1 ea 03 80 3c 02 00 0f 84 25 da ff ff 48 8b 3c 24 e8 89 2d b8 ff e9 17 da ff ff e8 8f 50 82 ff <0f> 0b 4c 8b b4 24 20 01 00 00 e8 80 50 82 ff 0f b6 ac 24 50 02 00
RSP: 0018:ffff8880b4a17500 EFLAGS: 00010293
RAX: ffff8880b49fe4c0 RBX: 0000000000000001 RCX: ffffffff81e03070
RDX: 0000000000000000 RSI: ffffffff81e034e1 RDI: 0000000000000007
overlayfs: './file0' not a directory
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88804e2ce7f0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555555c5b708 CR3: 000000009e3df000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400