================================================================== BUG: KCSAN: data-race in exit_signals / prepare_signal write to 0xffff88809ee4d0a4 of 4 bytes by task 28181 on cpu 0: exit_signals+0x130/0x460 kernel/signal.c:2822 do_exit+0x17b/0x1880 kernel/exit.c:750 do_group_exit+0xae/0x1a0 kernel/exit.c:899 get_signal+0x2a7/0x1290 kernel/signal.c:2734 do_signal+0x2b/0x670 arch/x86/kernel/signal.c:813 exit_to_usermode_loop+0x24a/0x2c0 arch/x86/entry/common.c:160 prepare_exit_to_usermode+0x190/0x1c0 arch/x86/entry/common.c:195 swapgs_restore_regs_and_return_to_usermode+0x0/0x40 read to 0xffff88809ee4d0a4 of 4 bytes by task 7751 on cpu 1: sig_task_ignored kernel/signal.c:94 [inline] sig_ignored kernel/signal.c:119 [inline] prepare_signal+0x1f0/0x770 kernel/signal.c:956 __send_signal+0x95/0x8a0 kernel/signal.c:1076 send_signal+0x211/0x2a0 kernel/signal.c:1236 do_send_sig_info+0x59/0xc0 kernel/signal.c:1285 group_send_sig_info kernel/signal.c:1408 [inline] group_send_sig_info+0x8a/0x90 kernel/signal.c:1398 kill_pid_info+0x4d/0x90 kernel/signal.c:1442 kill_something_info+0x238/0x290 kernel/signal.c:1557 __do_sys_kill kernel/signal.c:3640 [inline] __se_sys_kill kernel/signal.c:3634 [inline] __x64_sys_kill+0xef/0x120 kernel/signal.c:3634 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 7751 Comm: syz-executor.2 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================