syzbot

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BUG: KCSAN: data-race in evdev_pass_values / evdev_read

write to 0xffff888104301808 of 4 bytes by task 8202 on cpu 0:
 __pass_event drivers/input/evdev.c:239 [inline]
 evdev_pass_values+0x3d4/0x510 drivers/input/evdev.c:278
 evdev_events+0x8e/0xd0 drivers/input/evdev.c:306
 input_pass_values+0x123/0x390 drivers/input/input.c:127
 input_event_dispose+0x248/0x320 drivers/input/input.c:341
 input_handle_event+0x9e8/0xa20 drivers/input/input.c:369
 input_inject_event+0xbc/0x120 drivers/input/input.c:423
 evdev_write+0x1fa/0x290 drivers/input/evdev.c:528
 vfs_write+0x269/0x960 fs/read_write.c:684
 ksys_write+0xda/0x1a0 fs/read_write.c:738
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x40/0x50 fs/read_write.c:746
 x64_sys_call+0x27fe/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:2
 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 0xffff888104301808 of 4 bytes by task 2979 on cpu 1:
 evdev_read+0x158/0x5e0 drivers/input/evdev.c:572
 vfs_read+0x1a8/0x770 fs/read_write.c:570
 ksys_read+0xda/0x1a0 fs/read_write.c:715
 __do_sys_read fs/read_write.c:724 [inline]
 __se_sys_read fs/read_write.c:722 [inline]
 __x64_sys_read+0x40/0x50 fs/read_write.c:722
 x64_sys_call+0x27bc/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:1
 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

value changed: 0x00000003 -> 0x00000005

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 2979 Comm: acpid Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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