syzbot

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BUG: KCSAN: data-race in exec_mmap / mm_update_next_owner

write to 0xffff88811e5114e0 of 8 bytes by task 26168 on cpu 1:
 exec_mmap+0x11c/0x310 fs/exec.c:1012
 begin_new_exec+0x6a8/0xf10 fs/exec.c:1293
 load_elf_binary+0x641/0x1970 fs/binfmt_elf.c:1001
 search_binary_handler fs/exec.c:1736 [inline]
 exec_binprm fs/exec.c:1778 [inline]
 bprm_execve+0x539/0xcc0 fs/exec.c:1853
 kernel_execve+0x614/0x670 fs/exec.c:2020
 call_usermodehelper_exec_async+0x199/0x240 kernel/umh.c:110
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffff88811e5114e0 of 8 bytes by task 26173 on cpu 0:
 mm_update_next_owner+0x1a2/0x410 kernel/exit.c:487
 exit_mm+0xd9/0x180 kernel/exit.c:562
 do_exit+0x558/0x1660 kernel/exit.c:856
 do_group_exit+0x101/0x150 kernel/exit.c:1019
 get_signal+0xeb1/0xff0 kernel/signal.c:2859
 arch_do_signal_or_restart+0x89/0x2a0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop+0x6f/0xe0 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:297
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000000 -> 0xffff88811d304b00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 26173 Comm: syz-executor.3 Not tainted 6.3.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
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