syzbot

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BUG: KCSAN: data-race in fasync_remove_entry / kill_fasync

write to 0xffff88811290e748 of 8 bytes by task 4251 on cpu 1:
 fasync_remove_entry+0xd2/0x130 fs/fcntl.c:1008
 fasync_helper+0x96/0xc0 fs/fcntl.c:1107
 pipe_fasync+0x85/0x160 fs/pipe.c:754
 __fput+0x664/0x6d0 fs/file_table.c:428
 __fput_sync+0x43/0x60 fs/file_table.c:516
 __do_sys_close fs/open.c:1567 [inline]
 __se_sys_close+0xf9/0x1a0 fs/open.c:1552
 __x64_sys_close+0x1f/0x30 fs/open.c:1552
 x64_sys_call+0x25cb/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:4
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811290e748 of 8 bytes by task 4246 on cpu 0:
 kill_fasync+0x24/0x170 fs/fcntl.c:1149
 wakeup_pipe_readers fs/splice.c:183 [inline]
 splice_file_to_pipe+0x311/0x390 fs/splice.c:1298
 do_splice+0xc8b/0x1120 fs/splice.c:1379
 __do_splice fs/splice.c:1436 [inline]
 __do_sys_splice fs/splice.c:1652 [inline]
 __se_sys_splice+0x24c/0x390 fs/splice.c:1634
 __x64_sys_splice+0x78/0x90 fs/splice.c:1634
 x64_sys_call+0x2945/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:276
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff888104bc0630 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 4246 Comm: syz.1.273 Not tainted 6.12.0-rc6-syzkaller-00272-gda4373fbcf00 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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