netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
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BUG: KCSAN: data-race in __htab_map_lookup_elem / bpf_lru_pop_free

write to 0xffff88813e5822a8 of 4 bytes by task 13849 on cpu 1:
 __local_list_add_pending kernel/bpf/bpf_lru_list.c:350 [inline]
 bpf_common_lru_pop_free kernel/bpf/bpf_lru_list.c:449 [inline]
 bpf_lru_pop_free+0xbea/0xcc0 kernel/bpf/bpf_lru_list.c:496
 prealloc_lru_pop kernel/bpf/hashtab.c:311 [inline]
 __htab_lru_percpu_map_update_elem+0xea/0x600 kernel/bpf/hashtab.c:1357
 bpf_percpu_hash_update+0x61/0xa0 kernel/bpf/hashtab.c:2411
 bpf_map_update_value+0x36b/0x570 kernel/bpf/syscall.c:270
 generic_map_update_batch+0x3ff/0x550 kernel/bpf/syscall.c:2044
 bpf_map_do_batch+0x25c/0x380 kernel/bpf/syscall.c:5632
 __sys_bpf+0x5f8/0x7c0 kernel/bpf/syscall.c:-1
 __do_sys_bpf kernel/bpf/syscall.c:6259 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6257 [inline]
 __x64_sys_bpf+0x41/0x50 kernel/bpf/syscall.c:6257
 x64_sys_call+0x2aee/0x3000 arch/x86/include/generated/asm/syscalls_64.h:322
 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 0xffff88813e5822a8 of 4 bytes by task 12702 on cpu 0:
 lookup_nulls_elem_raw kernel/bpf/hashtab.c:651 [inline]
 __htab_map_lookup_elem+0xab/0x150 kernel/bpf/hashtab.c:681
 htab_lru_percpu_map_lookup_percpu_elem+0x43/0xf0 kernel/bpf/hashtab.c:2362
 bpf_prog_2fa48809db854bdb+0x40/0x48
 bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline]
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run include/linux/filter.h:728 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline]
 bpf_trace_run3+0x10f/0x1d0 kernel/trace/bpf_trace.c:2117
 __do_trace_kmem_cache_free include/trace/events/kmem.h:117 [inline]
 trace_kmem_cache_free include/trace/events/kmem.h:117 [inline]
 kmem_cache_free+0x329/0x3d0 mm/slub.c:6739
 __io_req_caches_free+0xfe/0x210 io_uring/io_uring.c:2824
 io_req_caches_free+0x1f/0x60 io_uring/io_uring.c:2836
 io_ring_exit_work+0x26d/0x560 io_uring/io_uring.c:3034
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3346
 worker_thread+0x582/0x770 kernel/workqueue.c:3427
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x122/0x1b0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0xabaa1b48 -> 0x7b769fa0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 12702 Comm: kworker/u8:30 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: iou_exit io_ring_exit_work
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