syzbot

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BUG: KCSAN: data-race in init_file / prepare_creds

write to 0xffff8881009c6228 of 4 bytes by task 7057 on cpu 0:
 get_cred_many include/linux/cred.h:219 [inline]
 get_cred include/linux/cred.h:235 [inline]
 init_file+0x2e/0x1c0 fs/file_table.c:158
 alloc_empty_file+0x8b/0x200 fs/file_table.c:241
 alloc_file fs/file_table.c:354 [inline]
 alloc_file_pseudo+0xc6/0x160 fs/file_table.c:383
 __anon_inode_getfile fs/anon_inodes.c:166 [inline]
 __anon_inode_getfd fs/anon_inodes.c:283 [inline]
 anon_inode_getfd+0xbf/0x190 fs/anon_inodes.c:307
 bpf_map_new_fd+0x52/0x70 kernel/bpf/syscall.c:1191
 map_create+0xd2c/0xda0 kernel/bpf/syscall.c:1605
 __sys_bpf+0x54e/0x7c0 kernel/bpf/syscall.c:6146
 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
 __x64_sys_bpf+0x41/0x50 kernel/bpf/syscall.c:6272
 x64_sys_call+0x28e1/0x3000 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd8/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881009c6180 of 184 bytes by task 7054 on cpu 1:
 prepare_creds+0x6e/0x550 kernel/cred.c:192
 copy_creds+0x8f/0x340 kernel/cred.c:286
 copy_process+0x638/0x1ef0 kernel/fork.c:2043
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2608
 __do_sys_clone kernel/fork.c:2749 [inline]
 __se_sys_clone kernel/fork.c:2733 [inline]
 __x64_sys_clone+0xe6/0x120 kernel/fork.c:2733
 x64_sys_call+0x12d0/0x3000 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd8/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 7054 Comm: syz.4.11281 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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