From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f70.google.com (mail-ot1-f70.google.com [209.85.210.70]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F2D41632 for ; Wed, 11 Feb 2026 03:49:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.70 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770781746; cv=none; b=e4dIO9TLPEKnGuReeoPvToEEBxpqlx78B9tnUItTUqnEFq0bJISuImRLLceixirl6hYkMau+jAvWPUgiWAG/14dEKsEsUPlByGee3URrNflbMCLP4x2UAmgdpPhOHFqComhTfn8RMDLSmcVdfS4Gd5Dwye4zUW38EoBB7RBtLEs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770781746; c=relaxed/simple; bh=eLvV7/NqpiWTuFtAseB+71vz3kzro+OoJxECSBYrWlE=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=dMsivISJ2TB0oyzhI030a45Ipg+Aus7xZnzjosiMaXydy/+qu2c/1ULQGUQQuC05vrYu9+oK7fHxwFmAKd9tobmQiVzu0ZDfgreFp7NMJB6ehFlAys2FYiA62tDKnZdf/FiGSU5Jb11Vt5fB7dfXJNuPGJnacloze3R2LbQ6ytY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.210.70 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f70.google.com with SMTP id 46e09a7af769-7d1950b48f3so5480038a34.0 for ; Tue, 10 Feb 2026 19:49:04 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770781744; x=1771386544; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=EAqjalnJF49zY3K6DkdEjJgSw8YHmFbk+7CGauFhRQ8=; b=F+AwkkLcT3PxJgFH4jhkXCrodxnFGuptjuGtzZhWxwBC90tR4xsBXLKPgRaZVyQ0YI ubMeyB1x7imM3ZX2GoKQe2OO9ZqLF9x2a+lfyWZux5ulcjNbd7UFFZ/cNt72X/B5nwGR PomYSm/joM8H/fTaBEq1mm8ORWEeF86KSU1faQrGa8qLUIqyHsOTycNppZZIOiCAkKs9 gTYkvOk5v4s+7WWZ9RslLFxG46liE3F9qR3IzQ4o/F/W2FPZTFCij8YuvrbYTZjpGFmI WOV+9AXcDFsmLBl4OYbCuYrLP91WbMZ3oLkpEnaC9uVkY40LvEvEquKEGTWHmZzr2qN0 kLzg== X-Gm-Message-State: AOJu0YzIiAyMNxrddQRgbVXQYOi8PDDgOrvHUN4HEuPxIoFwkAP9s5nk WUMlSjCDs01a2f1RKBXxkV9WhpoLW/qW1wC0Xh21p/Ll6uMTAs6KCke6QOlHuwwYdKnzxcbyUJK /b4t+wN4IhnR3mrlIL3Gn0XnbzQNc1ja4BXopctLcJk8PZgHgn0IFNQdVs1Q= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:199b:b0:662:c04a:132e with SMTP id 006d021491bc7-66d0bea8f9amr7658599eaf.44.1770781744058; Tue, 10 Feb 2026 19:49:04 -0800 (PST) Date: Tue, 10 Feb 2026 19:49:04 -0800 In-Reply-To: <20260211033121.713551-1-suunj1331@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <698bfc30.a70a0220.2c38d7.007e.GAE@google.com> Subject: Re: [syzbot] [kernel?] KASAN: slab-use-after-free Read in futex_unqueue From: syzbot To: linux-kernel@vger.kernel.org, suunj1331@gmail.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: kernel BUG in __mmput ------------[ cut here ]------------ kernel BUG at kernel/fork.c:1168! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 7127 Comm: syz.0.226 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:__mmput kernel/fork.c:1168 [inline] RIP: 0010:__mmput+0x36a/0x410 kernel/fork.c:1166 Code: e8 7b a2 41 00 48 89 df e8 33 c0 b3 00 e9 c4 fd ff ff e8 69 a2 41 00 48 89 df e8 d1 b7 ab 00 e9 65 fd ff ff e8 57 a2 41 00 90 <0f> 0b e8 4f a2 41 00 48 89 df e8 c7 cc ff ff eb b3 48 89 ef e8 ad RSP: 0018:ffffc90004927b50 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888077276e40 RCX: ffffffff81c4fe7d RDX: ffff888026225ac0 RSI: ffffffff81c50189 RDI: ffff888026225ac0 RBP: 00000000ffffffff R08: 0000000000000005 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000200 R13: ffff888077277110 R14: ffff88802a50ba00 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881246bd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000000007ff CR3: 00000000749f2000 CR4: 00000000003526f0 Call Trace: mmput+0x67/0x80 kernel/fork.c:1197 exit_mm kernel/exit.c:581 [inline] do_exit+0x78a/0x2a30 kernel/exit.c:959 do_group_exit+0xd5/0x2a0 kernel/exit.c:1112 get_signal+0x1ec7/0x21e0 kernel/signal.c:3034 arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x4a0 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x668/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd9de19bf79 Code: Unable to access opcode bytes at 0x7fd9de19bf4f. RSP: 002b:00007fd9def750e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fd9de415fa8 RCX: 00007fd9de19bf79 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd9de415fa8 RBP: 00007fd9de415fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd9de416038 R14: 00007ffc457ef100 R15: 00007ffc457ef1e8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__mmput kernel/fork.c:1168 [inline] RIP: 0010:__mmput+0x36a/0x410 kernel/fork.c:1166 Code: e8 7b a2 41 00 48 89 df e8 33 c0 b3 00 e9 c4 fd ff ff e8 69 a2 41 00 48 89 df e8 d1 b7 ab 00 e9 65 fd ff ff e8 57 a2 41 00 90 <0f> 0b e8 4f a2 41 00 48 89 df e8 c7 cc ff ff eb b3 48 89 ef e8 ad RSP: 0018:ffffc90004927b50 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888077276e40 RCX: ffffffff81c4fe7d RDX: ffff888026225ac0 RSI: ffffffff81c50189 RDI: ffff888026225ac0 RBP: 00000000ffffffff R08: 0000000000000005 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000200 R13: ffff888077277110 R14: ffff88802a50ba00 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881246bd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000000007ff CR3: 00000000324f4000 CR4: 00000000003526f0 Tested on: commit: ca8f421e Merge tag 'x86_sev_for_v7.0_rc1' of git://git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1109b402580000 kernel config: https://syzkaller.appspot.com/x/.config?x=aaa1d655bee4457b dashboard link: https://syzkaller.appspot.com/bug?extid=6c1861115b4253e45969 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 patch: https://syzkaller.appspot.com/x/patch.diff?x=174f0e5a580000