------------[ cut here ]------------
WARNING: kernel/printk/printk_ringbuffer.c:1278 at get_data+0x364/0x400, CPU#1: syz-executor.2/25310
Modules linked in:
CPU: 1 UID: 0 PID: 25310 Comm: syz-executor.2 Not tainted 6.18.0-rc3-next-20251029 #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 9e 5b 00 e9 a9 fe ff ff e8 3d bb 1e 00 90 <0f> 0b 90 45 31 e4 e9 3b ff ff ff e8 2c bb 1e 00 90 0f 0b 90 45 31
RSP: 0018:ffff88801ee670a8 EFLAGS: 00010212
RAX: 0000000000002762 RBX: ffff88801ee671c0 RCX: ffffc900023eb000
RDX: 0000000000040000 RSI: ffffffff815557a3 RDI: 0000000000000006
RBP: ffff88801ee67188 R08: 0000000000000e46 R09: 00000216ca5cbfd9
R10: 0000000000000000 R11: 000062dec200002e R12: ffffffff85d30650
R13: 00003fffffffffff R14: 0000000000000000 R15: 0000000000000000
FS:  00007f8b0840e700(0000) GS:ffff8880e54f1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc740729004 CR3: 00000000136fa000 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: 0033:0x7f8b0ae988d7
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:00007f8b0840df48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8b0aee2970 RCX: 00007f8b0ae988d7
RDX: 0000000000000003 RSI: 0000000000004c00 RDI: 0000000000000004
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000003 R14: 00000000200002c0 R15: 0000000000000008
 </TASK>
irq event stamp: 903
hardirqs last  enabled at (909): [<ffffffff8154e310>] vprintk_emit+0x650/0x690
hardirqs last disabled at (914): [<ffffffff8154e2a1>] vprintk_emit+0x5e1/0x690
softirqs last  enabled at (736): [<ffffffff813bc0ec>] handle_softirqs+0x50c/0x770
softirqs last disabled at (721): [<ffffffff813bc484>] __irq_exit_rcu+0xc4/0x100
---[ end trace 0000000000000000 ]---
loop5: detected capacity change from 0 to 2048
EXT4-fs (loop2): fragment/cluster size (65536) != block size (4096)
netlink: 'syz-executor.4': attribute type 8 has an invalid length.
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 'syz-executor.7': attribute type 9 has an invalid length.
netlink: 'syz-executor.4': attribute type 9 has an invalid length.
loop2: detected capacity change from 0 to 2048
netlink: 'syz-executor.7': attribute type 10 has an invalid length.
EXT4-fs (loop2): fragment/cluster size (65536) != block size (4096)
EXT4-fs warning (device loop5): ext4_multi_mount_protect:332: MMP startup interrupted, failing mount