sg_write: data in/out 919516/251 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor.6 not setting count and/or reply_len properly
------------[ cut here ]------------
WARNING: CPU: 0 PID: 12002 at lib/iov_iter.c:385 _copy_from_iter+0x2f1/0x1320
Modules linked in:
CPU: 0 PID: 12002 Comm: syz-executor.6 Tainted: G             L     6.4.0-rc3-next-20230525 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:_copy_from_iter+0x2f1/0x1320
Code: b2 ff ff 89 c3 e9 1f ff ff ff e8 5a e4 35 ff be 85 01 00 00 48 c7 c7 c0 e6 9e 84 e8 b9 36 5a ff e9 13 fe ff ff e8 3f e4 35 ff <0f> 0b 45 31 f6 e9 67 ff ff ff e8 30 e4 35 ff 31 ff 89 ee e8 67 df
RSP: 0018:ffff88803037f608 EFLAGS: 00010216
RAX: 0000000000004906 RBX: 0000000000000000 RCX: ffffc90002602000
RDX: 0000000000040000 RSI: ffffffff821618b1 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8180f6c5 R12: 0000000000001000
R13: ffffea0001102800 R14: 0000000000001000 R15: ffff88803037f838
FS:  00007f83e2538700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d5df45d198 CR3: 0000000044ace000 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+0x2b8/0xd40
 ksys_write+0x12b/0x260
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f83e4fe3b19
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:00007f83e2538188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f83e50f7020 RCX: 00007f83e4fe3b19
RDX: 0000000000000125 RSI: 00000000200003c0 RDI: 0000000000000004
RBP: 00007f83e503df6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff06a427ef R14: 00007f83e2538300 R15: 0000000000022000
 </TASK>
irq event stamp: 1521
hardirqs last  enabled at (1533): [<ffffffff812fe3e8>] __up_console_sem+0x78/0x80
hardirqs last disabled at (1544): [<ffffffff812fe3cd>] __up_console_sem+0x5d/0x80
softirqs last  enabled at (1078): [<ffffffff8118de43>] irq_exit_rcu+0x93/0xc0
softirqs last disabled at (1073): [<ffffffff8118de43>] irq_exit_rcu+0x93/0xc0
---[ end trace 0000000000000000 ]---
sg_write: data in/out 919516/251 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor.6 not setting count and/or reply_len properly
loop0: detected capacity change from 0 to 512
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
EXT4-fs error (device loop0): ext4_validate_block_bitmap:431: comm syz-executor.0: bg 0: block 2: invalid block bitmap
EXT4-fs (loop0): unmounting filesystem 00000000-0000-0000-0000-000000000000.