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AJvYcCUcASzjt3Y85qBNpXWTq89UPtxE3/bi6f12bcUe2gWgYn6Gftf84MgnmWo9T8EhE+XWCgNv7Sh82jK+cxA=@vger.kernel.org X-Gm-Message-State: AOJu0YxSk8BSB4FqrjkSO4MX5toYoC5X9h+IR8jCl/+vVk8n57kbsZ0V QycbvG+UDIE0lo4nB3jfpo6to77XVvOYjHxLHkIn5Tq4RlzDu3Ral7XzjaM3W9Cngy8qrwj6taZ rxsUedV2bXWAxe0zDvBdMHiJpLHZfPhxrTeoBFBXpZv/R9BiQ2riVoJJFt+c= X-Google-Smtp-Source: AGHT+IFJhWEJ1/oaFGClk2GgR+etAe+nQroVNojAIznuwC57O4eAWg7uAX4V8RvYQSht2iYlBujBz85W4cL2tj9nhybPYYeNHctb Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:178:b0:659:9a49:8fe8 with SMTP id 006d021491bc7-65d0e9620c8mr12157870eaf.21.1767078924733; Mon, 29 Dec 2025 23:15:24 -0800 (PST) Date: Mon, 29 Dec 2025 23:15:24 -0800 In-Reply-To: <20251229201933.515797-1-alexandre@negrel.dev> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69537c0c.050a0220.329c0f.04b2.GAE@google.com> Subject: [syzbot ci] Re: io_uring: make overflowing cqe subject to OOM From: syzbot ci To: alexandre@negrel.dev, axboe@kernel.dk, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] io_uring: make overflowing cqe subject to OOM https://lore.kernel.org/all/20251229201933.515797-1-alexandre@negrel.dev * [PATCH] io_uring: make overflowing cqe subject to OOM and found the following issue: WARNING in io_get_cqe_overflow Full report is available here: https://ci.syzbot.org/series/d71ff874-04e1-4cc7-b7c0-e48eb77bc984 *** WARNING in io_get_cqe_overflow tree: torvalds URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux base: f8f9c1f4d0c7a64600e2ca312dec824a0bc2f1da arch: amd64 compiler: Debian clang version 21.1.8 (++20251202083448+f68f64eb8130-1~exp1~20251202083504.46), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/c13ff885-4e87-4df2-9d49-a52f3d040dd6/config C repro: https://ci.syzbot.org/findings/e3c6e33b-4e4e-45de-b5b7-4ff5fc363989/c_repro syz repro: https://ci.syzbot.org/findings/e3c6e33b-4e4e-45de-b5b7-4ff5fc363989/syz_repro ------------[ cut here ]------------ WARNING: io_uring/io_uring.h:211 at io_lockdep_assert_cq_locked io_uring/io_uring.h:211 [inline], CPU#0: syz.0.17/5984 WARNING: io_uring/io_uring.h:211 at io_get_cqe_overflow+0x599/0x730 io_uring/io_uring.h:249, CPU#0: syz.0.17/5984 Modules linked in: CPU: 0 UID: 0 PID: 5984 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:io_lockdep_assert_cq_locked io_uring/io_uring.h:211 [inline] RIP: 0010:io_get_cqe_overflow+0x599/0x730 io_uring/io_uring.h:249 Code: 0f 0b 90 e9 0e fb ff ff e8 c4 29 35 fd 90 0f 0b 90 e9 91 fb ff ff e8 b6 29 35 fd 90 0f 0b 90 e9 6a fd ff ff e8 a8 29 35 fd 90 <0f> 0b 90 e9 5c fd ff ff e8 9a 29 35 fd 90 0f 0b 90 e9 4a fd ff ff RSP: 0018:ffffc90003cf7958 EFLAGS: 00010293 RAX: ffffffff848d4748 RBX: 0000000000000000 RCX: ffff888110c8ba80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff888110c8ba80 R09: 0000000000000002 R10: 00000000fffffdef R11: 0000000000000000 R12: 0000000000000000 R13: 1ffff11022544c00 R14: ffff888112a26000 R15: dffffc0000000000 FS: 00005555940b9500(0000) GS:ffff88818e40f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30563fff CR3: 00000001731de000 CR4: 00000000000006f0 Call Trace: io_get_cqe io_uring/io_uring.h:271 [inline] io_fill_cqe_req io_uring/io_uring.h:293 [inline] __io_submit_flush_completions+0x11c/0xe50 io_uring/io_uring.c:1507 io_submit_flush_completions io_uring/io_uring.h:239 [inline] io_submit_state_end io_uring/io_uring.c:2318 [inline] io_submit_sqes+0x1c26/0x2130 io_uring/io_uring.c:2433 __do_sys_io_uring_enter io_uring/io_uring.c:3264 [inline] __se_sys_io_uring_enter+0x2f7/0x2c30 io_uring/io_uring.c:3203 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f00d579acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc380f6178 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f00d5a05fa0 RCX: 00007f00d579acb9 RDX: 0000000000000002 RSI: 0000000000004d10 RDI: 0000000000000003 RBP: 00007f00d5808bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f00d5a05fac R14: 00007f00d5a05fa0 R15: 00007f00d5a05fa0 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com.