syzbot

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BUG: KCSAN: data-race in console_flush_all / console_flush_all

write to 0xffffffff86e36ee8 of 8 bytes by task 5210 on cpu 0:
 console_emit_next_record kernel/printk/printk.c:3144 [inline]
 console_flush_one_record kernel/printk/printk.c:3269 [inline]
 console_flush_all+0x38c/0x6c0 kernel/printk/printk.c:3343
 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
 console_unlock+0xa1/0x280 kernel/printk/printk.c:3413
 vprintk_emit+0x3e4/0x600 kernel/printk/printk.c:2479
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2504
 caif_disconnect_client+0x13d/0x150 net/caif/cfcnfg.c:194
 caif_release+0xec/0x250 net/caif/caif_socket.c:918
 __sock_release net/socket.c:727 [inline]
 sock_release+0x4b/0xe0 net/socket.c:755
 __sys_socketpair+0x3fa/0x420 net/socket.c:-1
 __do_sys_socketpair net/socket.c:1928 [inline]
 __se_sys_socketpair net/socket.c:1925 [inline]
 __x64_sys_socketpair+0x52/0x60 net/socket.c:1925
 x64_sys_call+0x2de5/0x3020 arch/x86/include/generated/asm/syscalls_64.h:54
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff86e36ee8 of 8 bytes by task 5209 on cpu 1:
 console_flush_one_record kernel/printk/printk.c:3270 [inline]
 console_flush_all+0x548/0x6c0 kernel/printk/printk.c:3343
 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
 console_unlock+0xa1/0x280 kernel/printk/printk.c:3413
 vprintk_emit+0x3e4/0x600 kernel/printk/printk.c:2479
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2504
 do_execveat_common+0x716/0x720 fs/exec.c:1842
 __do_sys_execveat fs/exec.c:1941 [inline]
 __se_sys_execveat fs/exec.c:1934 [inline]
 __x64_sys_execveat+0x76/0xa0 fs/exec.c:1934
 x64_sys_call+0x2a33/0x3020 arch/x86/include/generated/asm/syscalls_64.h:323
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000b75 -> 0x0000000000000b76

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 5209 Comm: syz.0.482 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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