sg_write: data in/out 65499/251 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor.0 not setting count and/or reply_len properly
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4877 at lib/iov_iter.c:376 _copy_from_iter+0x2bf/0x1200
Modules linked in:
CPU: 0 PID: 4877 Comm: syz-executor.0 Not tainted 6.3.0-rc5-next-20230406 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:_copy_from_iter+0x2bf/0x1200
Code: 5d 41 5e 41 5f e9 85 25 35 02 e8 bc 68 36 ff be 7c 01 00 00 48 c7 c7 20 ce 9e 84 e8 0b 74 5a ff e9 48 fe ff ff e8 a1 68 36 ff <0f> 0b 45 31 f6 eb 87 e8 95 68 36 ff 31 ff 89 ee e8 cc 63 36 ff 40
RSP: 0018:ffff88801941f608 EFLAGS: 00010216
RAX: 0000000000001db2 RBX: 0000000000000000 RCX: ffffc900007d3000
RDX: 0000000000040000 RSI: ffffffff82154e9f RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801941f838
R13: ffffea0001134800 R14: 0000000000001000 R15: ffff88801941f838
FS:  00007f91764f3700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 000000000dfca000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 copy_page_from_iter+0xe3/0x180
 blk_rq_map_user_iov+0xb39/0x16c0
 blk_rq_map_user_io+0x1d1/0x200
 sg_common_write.constprop.0+0xd8d/0x15f0
 sg_write.part.0+0x698/0xac0
 sg_write+0x8d/0xe0
 vfs_write+0x2d8/0xdc0
 ksys_write+0x12b/0x260
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f9178f7db19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f91764f3188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9179090f60 RCX: 00007f9178f7db19
RDX: 0000000000000125 RSI: 0000000020000000 RDI: 0000000000000003
loop4: detected capacity change from 0 to 4
RBP: 00007f9178fd7f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffebce60ccf R14: 00007f91764f3300 R15: 0000000000022000
 </TASK>
irq event stamp: 1263
hardirqs last  enabled at (1273): [<ffffffff812fb878>] __up_console_sem+0x78/0x80
hardirqs last disabled at (1284): [<ffffffff812fb85d>] __up_console_sem+0x5d/0x80
softirqs last  enabled at (622): [<ffffffff8118db0c>] __irq_exit_rcu+0xcc/0x110
softirqs last disabled at (591): [<ffffffff8118db0c>] __irq_exit_rcu+0xcc/0x110
---[ end trace 0000000000000000 ]---
EXT4-fs (loop4): VFS: Can't find ext4 filesystem