syzbot

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BUG: KCSAN: data-race in get_signal / ptrace_attach

write to 0xffff88811ad66330 of 4 bytes by task 16548 on cpu 0:
 ptrace_attach+0x26c/0x590 kernel/ptrace.c:462
 __do_sys_ptrace kernel/ptrace.c:1405 [inline]
 __se_sys_ptrace+0x146/0x2c0 kernel/ptrace.c:1387
 __x64_sys_ptrace+0x55/0x70 kernel/ptrace.c:1387
 x64_sys_call+0x2870/0x3000 arch/x86/include/generated/asm/syscalls_64.h:102
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811ad66330 of 4 bytes by task 16549 on cpu 1:
 get_signal+0x3a0/0xf70 kernel/signal.c:2919
 arch_do_signal_or_restart+0x96/0x440 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:40 [inline]
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 irqentry_exit_to_user_mode+0x5b/0xa0 kernel/entry/common.c:73
 irqentry_exit+0x12/0x50 kernel/entry/common.c:191
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 16549 Comm: syz.8.4231 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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