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AJvYcCX3E5ubjuGyLPykb6Sc7dTEkQbdkQ4oz5c6y1CCVgjDAUGa8NvL0tuiKV0ZdbziqC7fyuZ9Ddruc4nQGIUEBbZXy3uXJQf27v4zqsdd X-Gm-Message-State: AOJu0Ywpb0DrQXmdTr/lFDuVdIwbVDP5d4ZlSANIklllUaDoxql2C900 CqJraPr0B9qvE5nhRThgtAOnOSKRQPxDwpHrI36zl8zfRFJqCKJWeAysnP/OKAE7ya7X0MmE5nB r X-Google-Smtp-Source: AGHT+IHrkNFl1ffopNxKTETahIleS+aShL7P58PRcF7paaJk0m/WuLamCzDi5i0y3x8TPSw6eSx/Fg== X-Received: by 2002:ac2:4c34:0:b0:515:a670:3a6c with SMTP id u20-20020ac24c34000000b00515a6703a6cmr369582lfq.23.1711569930579; Wed, 27 Mar 2024 13:05:30 -0700 (PDT) Received: from cloudflare.com ([2a09:bac5:5064:2dc::49:159]) by smtp.gmail.com with ESMTPSA id x20-20020a170906b09400b00a469e55767dsm5797266ejy.214.2024.03.27.13.05.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Mar 2024 13:05:29 -0700 (PDT) References: <00000000000090fe770614a1ab17@google.com> <0000000000007a208d0614a9a9e0@google.com> User-agent: mu4e 1.6.10; emacs 29.2 From: Jakub Sitnicki To: syzbot Cc: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, edumazet@google.com, john.fastabend@gmail.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [bpf?] [net?] possible deadlock in ahci_single_level_irq_intr Date: Wed, 27 Mar 2024 21:04:14 +0100 In-reply-to: <0000000000007a208d0614a9a9e0@google.com> Message-ID: <87le63bfuf.fsf@cloudflare.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master diff --git a/net/core/sock_map.c b/net/core/sock_map.c index 27d733c0f65e..3692f7256dd6 100644 --- a/net/core/sock_map.c +++ b/net/core/sock_map.c @@ -907,6 +907,7 @@ static void sock_hash_delete_from_link(struct bpf_map *map, struct sock *sk, struct bpf_shtab_elem *elem_probe, *elem = link_raw; struct bpf_shtab_bucket *bucket; + WARN_ON_ONCE(irqs_disabled()); WARN_ON_ONCE(!rcu_read_lock_held()); bucket = sock_hash_select_bucket(htab, elem->hash); @@ -933,6 +934,10 @@ static long sock_hash_delete_elem(struct bpf_map *map, void *key) struct bpf_shtab_elem *elem; int ret = -ENOENT; + /* Can't run. We don't to play nice with hardirq-safe locks. */ + if (irqs_disabled()) + return -EOPNOTSUPP; + hash = sock_hash_bucket_hash(key, key_size); bucket = sock_hash_select_bucket(htab, hash); @@ -986,6 +991,7 @@ static int sock_hash_update_common(struct bpf_map *map, void *key, struct sk_psock *psock; int ret; + WARN_ON_ONCE(irqs_disabled()); WARN_ON_ONCE(!rcu_read_lock_held()); if (unlikely(flags > BPF_EXIST)) return -EINVAL;