loop3: detected capacity change from 0 to 8192
==================================================================
BUG: KCSAN: data-race in console_flush_all / console_flush_all

write to 0xffffffff8681a0a8 of 8 bytes by task 4989 on cpu 1:
 console_emit_next_record kernel/printk/printk.c:3083 [inline]
 console_flush_all+0x3b5/0x790 kernel/printk/printk.c:3210
 __console_flush_and_unlock kernel/printk/printk.c:3269 [inline]
 console_unlock+0xb6/0x340 kernel/printk/printk.c:3309
 vprintk_emit+0x408/0x690 kernel/printk/printk.c:2432
 dev_vprintk_emit+0x23c/0x2a0 drivers/base/core.c:4891
 dev_printk_emit+0x82/0xb0 drivers/base/core.c:4902
 __dev_printk+0xf6/0x110 drivers/base/core.c:4914
 _dev_printk+0x94/0xc0 drivers/base/core.c:4931
 proc_do_submiturb+0x1b50/0x1de0 drivers/usb/core/devio.c:1975
 proc_submiturb drivers/usb/core/devio.c:2003 [inline]
 usbdev_do_ioctl drivers/usb/core/devio.c:2703 [inline]
 usbdev_ioctl+0x1ddb/0x3f20 drivers/usb/core/devio.c:2827
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xc9/0x140 fs/ioctl.c:892
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:892
 x64_sys_call+0x1690/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff8681a0a8 of 8 bytes by task 4990 on cpu 0:
 console_flush_all+0x5a1/0x790 kernel/printk/printk.c:3211
 __console_flush_and_unlock kernel/printk/printk.c:3269 [inline]
 console_unlock+0xb6/0x340 kernel/printk/printk.c:3309
 vprintk_emit+0x408/0x690 kernel/printk/printk.c:2432
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2447
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x7a/0xa0 kernel/printk/printk.c:2457
 set_capacity_and_notify+0x151/0x200 block/genhd.c:93
 loop_set_size+0x2e/0x70 drivers/block/loop.c:234
 loop_configure+0x8bd/0xa50 drivers/block/loop.c:1106
 lo_ioctl+0x613/0x14f0
 blkdev_ioctl+0x359/0x450 block/ioctl.c:693
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xc9/0x140 fs/ioctl.c:892
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:892
 x64_sys_call+0x1690/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000db7 -> 0x0000000000000db8

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 4990 Comm: syz.3.396 Not tainted 6.14.0-rc6-syzkaller-00253-gcb82ca153949 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================
netlink: 40 bytes leftover after parsing attributes in process `syz.3.396'.