loop0: detected capacity change from 0 to 264192
SELinux: security_context_str_to_sid (staff_u) failed with errno=-22
==================================================================
BUG: KCSAN: data-race in data_push_tail / string

write to 0xffffffff8707dc82 of 1 bytes by task 19301 on cpu 0:
 string_nocheck lib/vsprintf.c:647 [inline]
 string+0x17b/0x220 lib/vsprintf.c:725
 vsnprintf+0xb57/0xe80 lib/vsprintf.c:2782
 va_format lib/vsprintf.c:1680 [inline]
 pointer+0x685/0x910 lib/vsprintf.c:2419
 vsnprintf+0x905/0xe80 lib/vsprintf.c:2786
 vscnprintf+0x3e/0x80 lib/vsprintf.c:2888
 printk_sprint kernel/printk/printk.c:2092 [inline]
 vprintk_store+0x5f2/0xb50 kernel/printk/printk.c:2206
 vprintk_emit+0xcc/0x430 kernel/printk/printk.c:2252
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2282
 vprintk+0x7f/0x90 kernel/printk/printk_safe.c:50
 _printk+0x76/0x96 kernel/printk/printk.c:2292
 logfc+0x2bb/0x2d0
 vfs_parse_fs_param+0x1cf/0x290 fs/fs_context.c:158
 vfs_parse_fs_string fs/fs_context.c:184 [inline]
 generic_parse_monolithic+0x16d/0x1d0 fs/fs_context.c:224
 nfs_fs_context_parse_monolithic+0x4aa/0x1190
 parse_monolithic_mount_data+0x3e/0x50 fs/fs_context.c:667
 do_new_mount+0x1d3/0x650 fs/namespace.c:3036
 path_mount+0x4ad/0xbb0 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x281/0x2d0 fs/namespace.c:3568
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffffffff8707dc80 of 8 bytes by task 19295 on cpu 1:
 data_make_reusable kernel/printk/printk_ringbuffer.c:590 [inline]
 data_push_tail+0x10f/0x440 kernel/printk/printk_ringbuffer.c:675
 data_alloc+0xbc/0x2b0 kernel/printk/printk_ringbuffer.c:1046
 prb_reserve+0x897/0xbd0 kernel/printk/printk_ringbuffer.c:1555
 vprintk_store+0x51c/0xb50 kernel/printk/printk.c:2196
 vprintk_emit+0xcc/0x430 kernel/printk/printk.c:2252
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2282
 vprintk+0x7f/0x90 kernel/printk/printk_safe.c:50
 _printk+0x76/0x96 kernel/printk/printk.c:2292
 selinux_add_opt+0x235/0x280 security/selinux/hooks.c:1002
 selinux_sb_eat_lsm_opts+0x727/0x7e0 security/selinux/hooks.c:2600
 security_sb_eat_lsm_opts+0x42/0x90 security/security.c:941
 generic_parse_monolithic+0x44/0x1d0 fs/fs_context.c:209
 nfs_fs_context_parse_monolithic+0x4aa/0x1190
 parse_monolithic_mount_data+0x3e/0x50 fs/fs_context.c:667
 do_new_mount+0x1d3/0x650 fs/namespace.c:3036
 path_mount+0x4ad/0xbb0 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x281/0x2d0 fs/namespace.c:3568
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000ffffe1b5 -> 0x6b6e55203a73666e

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19295 Comm: syz-executor.0 Not tainted 6.0.0-rc5-syzkaller-00094-ga335366bad13-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
==================================================================