syzbot

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BUG: KCSAN: data-race in bpf_obj_memcpy / bpf_obj_memcpy

write to 0xffff88811c81be60 of 2 bytes by task 26082 on cpu 0:
 bpf_obj_memcpy+0x13c/0x1a0 include/linux/bpf.h:-1
 copy_map_value include/linux/bpf.h:591 [inline]
 rhtab_map_update_existing kernel/bpf/hashtab.c:3019 [inline]
 rhtab_map_update_elem+0xfa/0xf40 kernel/bpf/hashtab.c:3048
 bpf_map_update_value+0x4ea/0x560 kernel/bpf/syscall.c:298
 generic_map_update_batch+0x52d/0x680 kernel/bpf/syscall.c:2103
 bpf_map_do_batch+0x25b/0x380 kernel/bpf/syscall.c:5832
 __sys_bpf+0xa8e/0xc30 kernel/bpf/syscall.c:-1
 __do_sys_bpf kernel/bpf/syscall.c:6537 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6534 [inline]
 __x64_sys_bpf+0x69/0x80 kernel/bpf/syscall.c:6534
 x64_sys_call+0x10cb/0x3020 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff88811c81be60 of 2 bytes by task 26081 on cpu 1:
 bpf_obj_memcpy+0x13c/0x1a0 include/linux/bpf.h:-1
 copy_map_value include/linux/bpf.h:591 [inline]
 rhtab_map_update_existing kernel/bpf/hashtab.c:3019 [inline]
 rhtab_map_update_elem+0xfa/0xf40 kernel/bpf/hashtab.c:3048
 bpf_map_update_value+0x4ea/0x560 kernel/bpf/syscall.c:298
 generic_map_update_batch+0x52d/0x680 kernel/bpf/syscall.c:2103
 bpf_map_do_batch+0x25b/0x380 kernel/bpf/syscall.c:5832
 __sys_bpf+0xa8e/0xc30 kernel/bpf/syscall.c:-1
 __do_sys_bpf kernel/bpf/syscall.c:6537 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6534 [inline]
 __x64_sys_bpf+0x69/0x80 kernel/bpf/syscall.c:6534
 x64_sys_call+0x10cb/0x3020 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000 -> 0xffff

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 26081 Comm: syz.9.3879 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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