loop7: detected capacity change from 0 to 256
sg_write: data in/out 912/1 bytes for SCSI command 0x10-- guessing data in;
   program syz-executor.3 not setting count and/or reply_len properly
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WARNING: CPU: 0 PID: 4000 at lib/iov_iter.c:629 _copy_from_iter+0x2bf/0x1150
Modules linked in:
CPU: 0 PID: 4000 Comm: syz-executor.3 Not tainted 6.2.0-rc1-next-20221226 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:_copy_from_iter+0x2bf/0x1150
Code: 5d 41 5e 41 5f e9 a5 9f 2f 02 e8 9c a3 37 ff be 79 02 00 00 48 c7 c7 80 cb 9e 84 e8 6b 18 5b ff e9 48 fe ff ff e8 81 a3 37 ff <0f> 0b 45 31 f6 eb 87 e8 75 a3 37 ff 31 ff 89 ee e8 3c 9f 37 ff 40
RSP: 0018:ffff8880456f75e8 EFLAGS: 00010212
RAX: 0000000000000ed1 RBX: 0000000000000000 RCX: ffffc900045ea000
RDX: 0000000000040000 RSI: ffffffff821139ff RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880456f7818
R13: ffffea00011a6800 R14: 0000000000000390 R15: ffff8880456f7818
FS:  00007f64342ca700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555555c31c58 CR3: 000000003d5fa000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 copy_page_from_iter+0xe3/0x180
 blk_rq_map_user_iov+0xb0c/0x1650
 blk_rq_map_user_io+0x1ee/0x220
 sg_common_write.constprop.0+0xd84/0x15e0
 sg_write.part.0+0x698/0xa90
 sg_write+0x88/0xe0
 vfs_write+0x2cf/0xd90
 ksys_write+0x12b/0x260
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f6436d54b19
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:00007f64342ca188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f6436e67f60 RCX: 00007f6436d54b19
RDX: 000000000000002b RSI: 0000000020000380 RDI: 0000000000000006
RBP: 00007f6436daef6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffe023cbef R14: 00007f64342ca300 R15: 0000000000022000
 </TASK>
irq event stamp: 6989
hardirqs last  enabled at (7021): [<ffffffff8460144a>] asm_sysvec_apic_timer_interrupt+0x1a/0x20
hardirqs last disabled at (7060): [<ffffffff843e931f>] sysvec_apic_timer_interrupt+0xf/0xc0
softirqs last  enabled at (6870): [<ffffffff8118087b>] __irq_exit_rcu+0x11b/0x180
softirqs last disabled at (6843): [<ffffffff8118087b>] __irq_exit_rcu+0x11b/0x180
---[ end trace 0000000000000000 ]---
loop6: detected capacity change from 0 to 256
syz-executor.4: attempt to access beyond end of device
loop4: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop4, logical block 10, lost async page write
syz-executor.4: attempt to access beyond end of device
loop4: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop4, logical block 10, lost async page write