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([111.198.231.89]) by newxmesmtplogicsvrsza53-0.qq.com (NewEsmtp) with SMTP id 244BB252; Sat, 21 Mar 2026 14:09:04 +0800 X-QQ-mid: xmsmtpt1774073344t4nakdz90 Message-ID: X-QQ-XMAILINFO: OVFdYp27KdlJKjm/DmkFv2answ6N011+X4+S1qnebNcF1cYR7edChlf4CqNolV LwNee8ZpzKG1jklGKrg5OhQWVMKKefTyF70mSK/oeCwRtlUO2uCKdlwGopHSlPRj7mu7FA1EPG1W RO/GX7n/nmwlaLv4hbQID2A8xqvRZ5QjWPqXj/zi7qpWe8cukdvTzXTT944sdVlkjE5XFbpD3AlG TT+k3h+9Z0iHVPp9lLjxCRw0Sl32FM1LYs1Ab4k5E7vdSm4wthDQph8ri1NR4vB4XGEPKgE0cvV6 b0tzBLLGe1pGmwuheu/E2BLwGGifHm8q66RfqnYUiZIjzGxWUF5ch2PoTIXAU07k3kzDtpEVOuTh L/yz354cVcpjueJ3vtVdo65+DKKalDgtV3WIv+JVaUy+iBlcdhXeaZfxHpFe77AnmuiJHA6dfj3w NgLubFqj6RdiqzCwR+x/BcJstYXgRNG1w1QKo1lmWEdnEe+QWMUGem2zYYJtOqR3aIixucXW6Eeb 5/FCrcvvi5yZlJBcPaN3Yxs2iQNNr++9YZvPOJt0DqNWqkTLe7FtmCMOk8N6xlVvTTbr8wIf2qaN 5iO3Tu1g3fHLio0wNWTbIfuvuxN2cOwpsF0lMjhfbt/6riEsHqvF8Zs1tguxZvQmov46r/RR1KHL lbkLTCuCOYw41r087thD5SyZQ1IaQUN3DLmL3sCch4XLxDXELJ824Z1Gt4UE1tYeEKCkbRYBTbUP 3oihyYg6kJS/MobukUv+pSPgCdPh/QGf+lEgvv6Sx/0f6rvEcsFMtj1GfIT386ch2frGAZAx5kDQ ruxNDWWUHy42AE2gTiN+AtFcNDXayg81TDh+SNzQc+pmR5f0ctrbr0S1aIwga1FnpvoeKQ5tVVDv /Lpu0Z9a8ZtXUjkPNvA24Aqpfcyu/A2he++hnHoZuT04vgNh2cA/dv5++cwcu6nLQ0XR2iKCmeK5 8Kr5z4PoN+IUBAnblqqky3LbvvGhUEskcyrqk0nWiHlRnvUt1oXjG9Fn5R8rgTFEaTE6Rl4Eq/Rp pbgJiLzQ== X-QQ-XMRINFO: MSVp+SPm3vtSI1QTLgDHQqIV1w2oNKDqfg== From: Edward Adam Davis To: syzbot+09ddb593eea76a158f42@syzkaller.appspotmail.com Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [block?] general protection fault in bio_alloc_bioset Date: Sat, 21 Mar 2026 14:09:05 +0800 X-OQ-MSGID: <20260321060904.344802-2-eadavis@qq.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <69bdcdcd.050a0220.3bf4de.002f.GAE@google.com> References: <69bdcdcd.050a0220.3bf4de.002f.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit #syz test diff --git a/block/bio.c b/block/bio.c index 5057047194c4..bbbcd1d2f85d 100644 --- a/block/bio.c +++ b/block/bio.c @@ -530,11 +530,13 @@ struct bio *bio_alloc_bioset(struct block_device *bdev, unsigned short nr_vecs, struct bio *bio = NULL; gfp_t saved_gfp = gfp; void *p; + static DEFINE_MUTEX(bio_alloc_lock); /* should not use nobvec bioset for nr_vecs > 0 */ if (WARN_ON_ONCE(!mempool_initialized(&bs->bvec_pool) && nr_vecs > 0)) return NULL; + mutex_lock(&bio_alloc_lock); gfp = try_alloc_gfp(gfp); if (bs->cache && nr_vecs <= BIO_INLINE_VECS) { /* @@ -570,8 +572,10 @@ struct bio *bio_alloc_bioset(struct block_device *bdev, unsigned short nr_vecs, * Give up if we are not allow to sleep as non-blocking mempool * allocations just go back to the slab allocation. */ - if (!(saved_gfp & __GFP_DIRECT_RECLAIM)) + if (!(saved_gfp & __GFP_DIRECT_RECLAIM)) { + mutex_unlock(&bio_alloc_lock); return NULL; + } punt_bios_to_rescuer(bs); @@ -594,6 +598,7 @@ struct bio *bio_alloc_bioset(struct block_device *bdev, unsigned short nr_vecs, else bio_init(bio, bdev, bvecs, nr_vecs, opf); bio->bi_pool = bs; + mutex_unlock(&bio_alloc_lock); return bio; } EXPORT_SYMBOL(bio_alloc_bioset);