loop1: detected capacity change from 0 to 1024
==================================================================
BUG: KCSAN: data-race in data_alloc / prb_reserve

write to 0xffffffff86075ee8 of 8 bytes by task 14957 on cpu 1:
 data_alloc+0x291/0x2c0 kernel/printk/printk_ringbuffer.c:1096
 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x53f/0x810 kernel/printk/printk.c:2266
 vprintk_emit+0x10c/0x5e0 kernel/printk/printk.c:2326
 dev_vprintk_emit+0x1df/0x210 drivers/base/core.c:4951
 dev_printk_emit+0x82/0xb0 drivers/base/core.c:4962
 __dev_printk+0xf6/0x110 drivers/base/core.c:4974
 _dev_warn+0x99/0xc0 drivers/base/core.c:5018
 proc_do_submiturb+0x1cc8/0x1dd0 drivers/usb/core/devio.c:1889
 proc_submiturb_compat drivers/usb/core/devio.c:2206 [inline]
 usbdev_do_ioctl drivers/usb/core/devio.c:2730 [inline]
 usbdev_ioctl+0x21b5/0x3e10 drivers/usb/core/devio.c:2824
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xd3/0x150 fs/ioctl.c:893
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:893
 x64_sys_call+0x1581/0x2d70 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 0xffffffff86075ee8 of 8 bytes by task 14956 on cpu 0:
 desc_read kernel/printk/printk_ringbuffer.c:482 [inline]
 desc_push_tail kernel/printk/printk_ringbuffer.c:778 [inline]
 desc_reserve kernel/printk/printk_ringbuffer.c:924 [inline]
 prb_reserve+0x235/0xb60 kernel/printk/printk_ringbuffer.c:1619
 vprintk_store+0x53f/0x810 kernel/printk/printk.c:2266
 vprintk_emit+0x10c/0x5e0 kernel/printk/printk.c:2326
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2360
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2370
 __ext4_msg+0x134/0x1a0 fs/ext4/super.c:992
 ext4_parse_param+0x8cf/0x1020 fs/ext4/super.c:2184
 vfs_parse_fs_param+0x13b/0x290 fs/fs_context.c:146
 vfs_parse_fs_string fs/fs_context.c:188 [inline]
 vfs_parse_monolithic_sep fs/fs_context.c:230 [inline]
 generic_parse_monolithic+0x165/0x1d0 fs/fs_context.c:258
 parse_monolithic_mount_data+0x43/0x50 fs/fs_context.c:719
 do_new_mount+0x1fa/0x690 fs/namespace.c:3348
 path_mount+0x49b/0xb30 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:3875
 __x64_sys_mount+0x67/0x80 fs/namespace.c:3875
 x64_sys_call+0x25c9/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:166
 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: 0x000000000017f718 -> 0x00000000002415d0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 14956 Comm: syz-executor.1 Tainted: G        W          6.10.0-rc1-syzkaller-00021-ge0cce98fe279 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
==================================================================
EXT4-fs: Ignoring removed nomblk_io_submit option