================================================================== BUG: KCSAN: data-race in do_signal_stop / prepare_signal write to 0xffff88800f18e02c of 4 bytes by task 5072 on cpu 0: freezer_count include/linux/freezer.h:121 [inline] freezable_schedule include/linux/freezer.h:173 [inline] do_signal_stop+0x562/0x6d0 kernel/signal.c:2400 get_signal+0x65d/0x14e0 kernel/signal.c:2737 arch_do_signal_or_restart+0x2a/0x270 arch/x86/kernel/signal.c:789 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x11a/0x1b0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88800f18e02c of 4 bytes by interrupt on cpu 1: sig_task_ignored kernel/signal.c:94 [inline] sig_ignored kernel/signal.c:119 [inline] prepare_signal+0x891/0xdb0 kernel/signal.c:966 send_sigqueue+0xea/0x430 kernel/signal.c:1865 posix_timer_event kernel/time/posix-timers.c:354 [inline] posix_timer_fn+0xe8/0x210 kernel/time/posix-timers.c:380 __run_hrtimer+0x163/0x460 kernel/time/hrtimer.c:1537 __hrtimer_run_queues kernel/time/hrtimer.c:1601 [inline] hrtimer_interrupt+0x380/0xaf0 kernel/time/hrtimer.c:1663 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0x6f/0x200 arch/x86/kernel/apic/apic.c:1106 sysvec_apic_timer_interrupt+0x32/0x80 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 8389 Comm: syz-fuzzer Tainted: G W 5.12.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: usb_submit_urb failed: -19 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: usb_submit_urb failed: -19 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: usb_submit_urb failed: -19