syzbot

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BUG: KCSAN: data-race in data_push_tail / number

write to 0xffffffff883d5ed6 of 1 bytes by task 28 on cpu 0:
 number+0x85f/0xa90 lib/vsprintf.c:564
 vsnprintf+0xa44/0xe30 lib/vsprintf.c:2890
 vscnprintf+0x42/0x90 lib/vsprintf.c:2930
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2165
 vprintk_store+0x570/0x810 kernel/printk/printk.c:2279
 vprintk_emit+0x10c/0x5e0 kernel/printk/printk.c:2329
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2363
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2373
 kauditd_printk_skb kernel/audit.c:546 [inline]
 kauditd_hold_skb+0x1a1/0x1b0 kernel/audit.c:581
 kauditd_send_queue+0x288/0x2e0 kernel/audit.c:766
 kauditd_thread+0x42a/0x650 kernel/audit.c:890
 kthread+0x1d1/0x210 kernel/kthread.c:388
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffffffff883d5ed0 of 8 bytes by task 14894 on cpu 1:
 data_make_reusable kernel/printk/printk_ringbuffer.c:594 [inline]
 data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:679
 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1054
 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x53f/0x810 kernel/printk/printk.c:2269
 vprintk_emit+0x10c/0x5e0 kernel/printk/printk.c:2329
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2363
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2373
 sidtab_context_to_sid+0x5c3/0x5e0 security/selinux/ss/sidtab.c:348
 security_context_to_sid_core+0x299/0x3b0 security/selinux/ss/services.c:1560
 security_context_to_sid_force+0x30/0x40 security/selinux/ss/services.c:1633
 selinux_inode_setxattr+0x58a/0x780 security/selinux/hooks.c:3253
 security_inode_setxattr+0xa2/0x120 security/security.c:2297
 __vfs_setxattr_locked+0x88/0x1d0 fs/xattr.c:286
 vfs_setxattr+0x140/0x290 fs/xattr.c:321
 do_setxattr fs/xattr.c:629 [inline]
 setxattr+0x1bc/0x230 fs/xattr.c:652
 __do_sys_fsetxattr fs/xattr.c:708 [inline]
 __se_sys_fsetxattr+0x118/0x180 fs/xattr.c:697
 __x64_sys_fsetxattr+0x67/0x80 fs/xattr.c:697
 x64_sys_call+0x266d/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:191
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000100003fb3 -> 0x34313d6570797420

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 14894 Comm: syz-executor.0 Tainted: G        W          6.9.0-rc4-syzkaller-00031-g96fca68c4fbf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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