From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794047453; b=PWS4xz0RS/vIvwx9+bIiFjX7nTQwyl2In9w7BDkhZWN27Op7ZDIW5SvFHbzhlYNXHXBG f6O83oemDsb2Fhe6TqdVkTGbni81+QSCY1YuUnAtVeh2WJHW+QYoAv5P1V3ICyxLbfRr5 c7KpWGkhCHYKQ5WCtBfsYTODsi629sJDDyXbFwUiWMk71P5GaPiziiUjmL7e5CZTNyiw4 bKmAaWS/m1Tl6MNJm9oE2MXcpjHV/nHaIBYBVV683pnlEHzP/ee0v+y0oRvogbaE1FShr ct0vKRwMk/9XR43z75pQIDiypto0kpMSTqsMkdilQAAT/yHl3GbPNQZ/RXKj5zFTpsA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794047453; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: MIME-Version:Content-Type:Content-Transfer-Encoding; bh=cWFWKEAQt6/gxwNWKGfFdUz4Rgwt9vqCgv7Xv7RB+oc=; b=xSOLdK5fB/bd72BvFm+53piVer6sdpsQI6qAzm2egNIV47XZGTdW87muXmG/tfrbFQ8C tx4QrYRHjv/GAor2ZboC/M6msWRisepa3x1dSDNaGHlNFUDhawPuJryB8mBz3HKk70sd3 TeTd1LXchIIBjqP9Kf3wYleKO81YB9Zlrghnaa9Uw3pCKEvmQvss0OdPqjwB03FbwD3EF nm1aGE8wkv+PeHVAsSs0oumS53GIDqvwRZS7bJrPv15SqcNIiAiWuWUpItlIh9mmep+Xr khLs3FT8qTwZgfGUJUPMYdm36LoLV+h01JNTihg0KdazA2MfdiShk6aRdYyR9l7njgw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=njgFaSrG; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C476F606A32D for ; Sat, 7 Nov 2026 10:30:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=njgFaSrG Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2C3881F0089F; Sat, 7 Nov 2026 10:30:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794047452; bh=cWFWKEAQt6/gxwNWKGfFdUz4Rgwt9vqCgv7Xv7RB+oc=; h=From:To:Cc:Subject:Date; b=njgFaSrGIWncEhKWclLU3edLHyqC9Qmr5oWBCkqlc3VeOnirJFfW4oF0yZuQpPHSG coXAb5aPqXClLukNcSv3QU8VG2f7vVPZpgMrxDyuk52xKeY/pCsR1KRkDroTYS+erZ 7DVNNwWXMg1NJSYhftcPWlRyFZrM8HCgiF5M3Ko6HKDxn8XvXUbLib91fHR9+B4/tj 4iYjZ4dgbZO1k/t0o3n9ywZmS99PEgNUNihcN6Xq/xsP9zX00UNkvsN5N0P4iyx4Z7 zhxMgQWqaRQ7JHPDvR6y1v4bih8Nm7tJhBwSz6jlx3tlcMHU4CTTvb00xrfQ3VHBI+ Hl487WAGTJhOg== From: Sasha Levin To: konishi.ryusuke@gmail.com, wangjianjian3@huawei.com, slava@dubeyko.com Cc: stable@vger.kernel.org Subject: FAILED: patch "[PATCH] nilfs2: ignore non-fatal signals during synchronous log write wait" failed to apply to 6.6-stable tree Date: Sat, 7 Nov 2026 05:30:51 -0500 Message-ID: <20261107053051-failed-6.6-7131aaa74bcc@kernel.org> X-Mailer: git-send-email 2.53.0 X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x 7131aaa74bcc7c9da1f1d1c8724da75c775557a0 # git commit -s git send-email --to '' --in-reply-to '20261107053051-failed-6.6-7131aaa74bcc@kernel.org' --subject-prefix 'PATCH 6.6.y' 'HEAD^..' Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From 7131aaa74bcc7c9da1f1d1c8724da75c775557a0 Mon Sep 17 00:00:00 2001 From: Ryusuke Konishi Date: Wed, 30 Sep 2026 03:26:54 +0900 Subject: [PATCH] nilfs2: ignore non-fatal signals during synchronous log write wait Based on a syzbot report, Wang Jianjian pointed out that following a successful directory operation in nilfs_rename(), a synchronous write requested within nilfs_transaction_commit(), triggered by a sync flag set by nilfs_commit_chunk(), could be interrupted by a user signal. This interruption leaves in-memory metadata updates intact while returning an error, causing inconsistency with the VFS dentry cache and ultimately triggering a kernel warning. According to "signal(7)", local disks are not classified as "slow devices" (such as terminals, FIFOs, or pipes) and their I/O operations on disk devices are not interrupted by signals. In kernel space, waiting for such disk I/O should therefore not be aborted by ordinary (non-fatal) signals. Suppress this issue by modifying nilfs_segctor_sync(), which waits for the log writer thread to complete synchronous writes, to catch only fatal signals via fatal_signal_pending() and return -EINTR rather than -ERESTARTSYS. To complement this change and prevent the wait loop from busy-looping when schedule() returns immediately due to a pending non-fatal signal, switch the wait state from TASK_INTERRUPTIBLE to TASK_KILLABLE. This serves as an effective interim stabilization measure without structural changes until a comprehensive fix for metadata consistency is implemented. Reported-by: syzbot+f6c7e1f1809f235eeb90@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=f6c7e1f1809f235eeb90 Fixes: 9ff05123e3bf ("nilfs2: segment constructor") Tested-by: syzbot+f6c7e1f1809f235eeb90@syzkaller.appspotmail.com Cc: Wang Jianjian Cc: stable@vger.kernel.org Signed-off-by: Ryusuke Konishi Signed-off-by: Viacheslav Dubeyko --- fs/nilfs2/ioctl.c | 2 +- fs/nilfs2/recovery.c | 2 +- fs/nilfs2/segment.c | 10 +++++----- 3 files changed, 7 insertions(+), 7 deletions(-) diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c index 01a04080ef704..b2b67d6a1f097 100644 --- a/fs/nilfs2/ioctl.c +++ b/fs/nilfs2/ioctl.c @@ -965,10 +965,10 @@ static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp, * Return: 0 on success, or one of the following negative error codes on * failure: * * %-EFAULT - Failure during execution of requested operation. + * * %-EINTR - Interrupted. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient memory available. * * %-ENOSPC - No space left on device (only in a panic state). - * * %-ERESTARTSYS - Interrupted. * * %-EROFS - Read only filesystem. */ static int nilfs_ioctl_sync(struct inode *inode, struct file *filp, diff --git a/fs/nilfs2/recovery.c b/fs/nilfs2/recovery.c index 9a70c28ec94c1..abe4101f7550c 100644 --- a/fs/nilfs2/recovery.c +++ b/fs/nilfs2/recovery.c @@ -790,11 +790,11 @@ static void nilfs_abort_roll_forward(struct the_nilfs *nilfs) * * Return: 0 on success, or one of the following negative error codes on * failure: + * * %-EINTR - Interrupted. * * %-EINVAL - Inconsistent filesystem state. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient memory available. * * %-ENOSPC - No space left on device (only in a panic state). - * * %-ERESTARTSYS - Interrupted. */ int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs, struct super_block *sb, diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c index 2f0e59847d026..af0c3560444f5 100644 --- a/fs/nilfs2/segment.c +++ b/fs/nilfs2/segment.c @@ -2259,7 +2259,7 @@ static int nilfs_segctor_sync(struct nilfs_sc_info *sci) wake_up(&sci->sc_wait_daemon); for (;;) { - set_current_state(TASK_INTERRUPTIBLE); + set_current_state(TASK_KILLABLE); /* * Synchronize only while the log writer thread is alive. @@ -2273,11 +2273,11 @@ static int nilfs_segctor_sync(struct nilfs_sc_info *sci) err = wait_req.err; break; } - if (!signal_pending(current)) { + if (!fatal_signal_pending(current)) { schedule(); continue; } - err = -ERESTARTSYS; + err = -EINTR; break; } finish_wait(&sci->sc_wait_request, &wait_req.wq); @@ -2311,10 +2311,10 @@ static void nilfs_segctor_wakeup(struct nilfs_sc_info *sci, int err, bool force) * * Return: 0 on success, or one of the following negative error codes on * failure: + * * %-EINTR - Interrupted. * * %-EIO - I/O error (including metadata corruption). * * %-ENOMEM - Insufficient memory available. * * %-ENOSPC - No space left on device (only in a panic state). - * * %-ERESTARTSYS - Interrupted. * * %-EROFS - Read only filesystem. */ int nilfs_construct_segment(struct super_block *sb) @@ -2341,10 +2341,10 @@ int nilfs_construct_segment(struct super_block *sb) * * Return: 0 on success, or one of the following negative error codes on * failure: + * * %-EINTR - Interrupted. * * %-EIO - I/O error (including metadata corruption). * * %-ENOMEM - Insufficient memory available. * * %-ENOSPC - No space left on device (only in a panic state). - * * %-ERESTARTSYS - Interrupted. * * %-EROFS - Read only filesystem. */ int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode, -- 2.53.0