loop0: detected capacity change from 0 to 147456
loop2: detected capacity change from 0 to 91
loop4: detected capacity change from 0 to 91
------------[ cut here ]------------
WARNING: kernel/printk/printk_ringbuffer.c:1278 at get_data+0x364/0x400, CPU#1: syz-executor.4/13939
Modules linked in:
CPU: 1 UID: 0 PID: 13939 Comm: syz-executor.4 Not tainted 6.18.0-rc2-next-20251027 #1 PREEMPT(voluntary) 
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:get_data+0x364/0x400
Code: e8 83 e0 07 83 c0 03 38 d0 0f 8c be fe ff ff 84 d2 0f 84 b6 fe ff ff 48 89 ef e8 47 91 5b 00 e9 a9 fe ff ff e8 3d b7 1e 00 90 <0f> 0b 90 45 31 e4 e9 3b ff ff ff e8 2c b7 1e 00 90 0f 0b 90 45 31
RSP: 0018:ffff88801694f0a8 EFLAGS: 00010216
RAX: 000000000000266b RBX: ffff88801694f1c0 RCX: ffffc90008c27000
RDX: 0000000000040000 RSI: ffffffff81555923 RDI: 0000000000000006
RBP: ffff88801694f188 R08: 000000000000119c R09: 000001fd635af678
R10: 0000000000000000 R11: 00003673c2000030 R12: ffffffff85d30650
R13: 00003fffffffffff R14: 0000000000000000 R15: 0000000000000000
FS:  00007f595c554700(0000) GS:ffff8880e54f4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001000 CR3: 000000002044b000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 _prb_read_valid+0x2f3/0x830
 prb_read_valid+0x78/0xa0
 printk_get_next_message+0x10b/0x570
 console_flush_one_record+0x64f/0xb20
 __console_flush_and_unlock+0xb1/0x1d0
 vprintk_emit+0x4c1/0x690
 _printk+0xbe/0xf0
 set_capacity_and_notify+0x16a/0x240
 loop_configure+0xcbd/0x15a0
 lo_ioctl+0x66d/0x1ca0
 blkdev_ioctl+0x365/0x6d0
 __x64_sys_ioctl+0x18f/0x210
 do_syscall_64+0xbf/0x390
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f595efde8d7
Code: 3c 1c 48 f7 d8 49 39 c4 72 b8 e8 a4 54 02 00 85 c0 78 bd 48 83 c4 08 4c 89 e0 5b 41 5c c3 0f 1f 44 00 00 b8 10 00 00 00 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:00007f595c553f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f595f028970 RCX: 00007f595efde8d7
RDX: 0000000000000003 RSI: 0000000000004c00 RDI: 0000000000000004
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000003 R14: 0000000020002b10 R15: 0000000000000006
 </TASK>
irq event stamp: 2007
hardirqs last  enabled at (2013): [<ffffffff8154e490>] vprintk_emit+0x650/0x690
hardirqs last disabled at (2018): [<ffffffff8154e421>] vprintk_emit+0x5e1/0x690
softirqs last  enabled at (1688): [<ffffffff813bc26c>] handle_softirqs+0x50c/0x770
softirqs last disabled at (1683): [<ffffffff813bc604>] __irq_exit_rcu+0xc4/0x100
---[ end trace 0000000000000000 ]---
loop6: detected capacity change from 0 to 91
loop3: detected capacity change from 0 to 91
msdos: Unknown parameter 'fsname'
loop5: detected capacity change from 0 to 91
loop0: detected capacity change from 0 to 147456
loop7: detected capacity change from 0 to 8
loop2: detected capacity change from 0 to 91
loop1: detected capacity change from 0 to 8
loop4: detected capacity change from 0 to 91
loop3: detected capacity change from 0 to 91
loop4: detected capacity change from 0 to 147456
msdos: Unknown parameter 'fsname'
loop0: detected capacity change from 0 to 147456
loop5: detected capacity change from 0 to 91
loop4: detected capacity change from 0 to 91
loop7: detected capacity change from 0 to 8
loop4: detected capacity change from 0 to 147456
loop1: detected capacity change from 0 to 8
loop6: detected capacity change from 0 to 91
loop3: detected capacity change from 0 to 91
msdos: Unknown parameter 'fsname'
loop2: detected capacity change from 0 to 91
loop0: detected capacity change from 0 to 147456
loop5: detected capacity change from 0 to 91
loop4: detected capacity change from 0 to 91
loop6: detected capacity change from 0 to 91
loop1: detected capacity change from 0 to 8
loop4: detected capacity change from 0 to 147456
msdos: Unknown parameter 'fsname'
loop2: detected capacity change from 0 to 91