------------[ cut here ]------------
WARNING: kernel/printk/printk_ringbuffer.c:1278 at get_data+0x364/0x400, CPU#1: syz-executor.0/10020
Modules linked in:
CPU: 1 UID: 0 PID: 10020 Comm: syz-executor.0 Not tainted 6.18.0-rc4-next-20251110 #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 77 87 5c 00 e9 a9 fe ff ff e8 7d 03 1f 00 90 <0f> 0b 90 45 31 e4 e9 3b ff ff ff e8 6c 03 1f 00 90 0f 0b 90 45 31
RSP: 0018:ffff88803efbf0a8 EFLAGS: 00010212
RAX: 0000000000001cf2 RBX: ffff88803efbf1c0 RCX: ffffc90002a9f000
RDX: 0000000000040000 RSI: ffffffff8155a673 RDI: 0000000000000006
RBP: ffff88803efbf188 R08: 0000000000001054 R09: 0000012741b0e07a
R10: 0000000000000000 R11: 00002724c200002f R12: ffffffff85d30710
R13: 00003fffffffffff R14: 0000000000000000 R15: 0000000000000000
FS: 00007f43ca174700(0000) GS:ffff8880e549c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f43ca173fe8 CR3: 000000000a19e000 CR4: 0000000000350ef0
Call Trace:
_prb_read_valid+0x2f3/0x830
prb_read_valid+0x78/0xa0
printk_get_next_message+0x10b/0x570
console_flush_one_record+0x673/0xb70
__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/0x430
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f43ccbfe8d7
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:00007f43ca173f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f43ccc48970 RCX: 00007f43ccbfe8d7
RDX: 0000000000000003 RSI: 0000000000004c00 RDI: 0000000000000004
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000003 R14: 0000000020000588 R15: 0000000000000003
irq event stamp: 909
hardirqs last enabled at (915): [] vprintk_emit+0x650/0x690
hardirqs last disabled at (920): [] vprintk_emit+0x5e1/0x690
softirqs last enabled at (688): [] handle_softirqs+0x50c/0x770
softirqs last disabled at (641): [] __irq_exit_rcu+0xc4/0x100
---[ end trace 0000000000000000 ]---
loop5: detected capacity change from 0 to 16383
loop4: detected capacity change from 0 to 16383
loop3: detected capacity change from 0 to 16383
loop6: detected capacity change from 0 to 264192
loop0: detected capacity change from 0 to 264192
ext3: Unknown parameter 'nouser_xattr'
loop2: detected capacity change from 0 to 264192
loop1: detected capacity change from 0 to 16383
loop4: detected capacity change from 0 to 264192
loop1: detected capacity change from 0 to 264192
ext3: Unknown parameter 'nouser_xattr'
ext3: Unknown parameter 'nouser_xattr'
loop4: detected capacity change from 0 to 16383
loop6: detected capacity change from 0 to 264192
loop4: detected capacity change from 0 to 264192
loop0: detected capacity change from 0 to 16383
ext3: Unknown parameter 'nouser_xattr'
loop0: detected capacity change from 0 to 264192
ext3: Unknown parameter 'nouser_xattr'
loop1: detected capacity change from 0 to 16383
loop1: detected capacity change from 0 to 264192
loop7: detected capacity change from 0 to 264192
loop5: detected capacity change from 0 to 16383
ext3: Unknown parameter 'nouser_xattr'
ext3: Unknown parameter 'nouser_xattr'
loop2: detected capacity change from 0 to 264192
loop3: detected capacity change from 0 to 16383
loop4: detected capacity change from 0 to 16383
loop0: detected capacity change from 0 to 16383
loop6: detected capacity change from 0 to 264192
loop0: detected capacity change from 0 to 264192
ext3: Unknown parameter 'nouser_xattr'
loop7: detected capacity change from 0 to 264192
ext3: Unknown parameter 'nouser_xattr'
loop5: detected capacity change from 0 to 16383
loop0: detected capacity change from 0 to 16383
loop3: detected capacity change from 0 to 16383
loop2: detected capacity change from 0 to 264192
loop0: detected capacity change from 0 to 264192
ext3: Unknown parameter 'nouser_xattr'