------------[ cut here ]------------
WARNING: kernel/printk/printk_ringbuffer.c:1278 at get_data+0x48a/0x840, CPU#1: syz.6.97/6735
Modules linked in:
CPU: 1 UID: 0 PID: 6735 Comm: syz.6.97 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:get_data+0x48a/0x840
Code: 83 c4 f8 48 b8 00 00 00 00 00 fc ff df 41 0f b6 04 07 84 c0 0f 85 ee 01 00 00 44 89 65 00 49 83 c5 08 eb 13 e8 87 d2 1e 00 90 <0f> 0b 90 eb 05 e8 7c d2 1e 00 45 31 ed 4c 89 e8 48 83 c4 28 5b 41
RSP: 0018:ffffc90005156760 EFLAGS: 00010293
RAX: ffffffff81a1aa59 RBX: 00003fffffffffff RCX: ffff888101f1d700
RDX: 0000000000000000 RSI: 00003fffffffffff RDI: 0000000000000000
RBP: 0000000000000012 R08: 0000000000000e9d R09: 00000012999eb8d6
R10: 00000012999eb8d6 R11: 00001a4fc200002d R12: 0000000000000012
R13: 0000000000000000 R14: ffffc900051568a8 R15: 1ffffffff1bcaa9e
FS:  00007feea44176c0(0000) GS:ffff8882a9eeb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fee9920f000 CR3: 00000001b9fc8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 _prb_read_valid+0x672/0xa90
 prb_read_valid+0x3c/0x60
 printk_get_next_message+0x15c/0x7b0
 console_flush_all+0x4cc/0xb10
 console_unlock+0xbb/0x190
 vprintk_emit+0x4c5/0x590
 _printk+0xcf/0x120
 set_capacity_and_notify+0x208/0x2d0
 loop_set_size+0x44/0xb0
 loop_configure+0x9f8/0xe50
 lo_ioctl+0x806/0x1c50
 blkdev_ioctl+0x60e/0x710
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feea358ebcb
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007feea4416dc0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007feea358ebcb
RDX: 0000000000000004 RSI: 0000000000004c00 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000009e0f
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 00007feea4416ef0 R14: 00007feea4416eb0 R15: 00007fee99200000
 </TASK>
